xref: /freebsd/sys/dev/sound/usb/uaudio.c (revision 1ce1c6895245648ba022f7187df1626904dc1f89)
1 /*	$NetBSD: uaudio.c,v 1.91 2004/11/05 17:46:14 kent Exp $	*/
2 /*	$FreeBSD$ */
3 
4 /*-
5  * Copyright (c) 1999 The NetBSD Foundation, Inc.
6  * All rights reserved.
7  *
8  * This code is derived from software contributed to The NetBSD Foundation
9  * by Lennart Augustsson (lennart@augustsson.net) at
10  * Carlstedt Research & Technology.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36 
37 /*
38  * USB audio specs: http://www.usb.org/developers/devclass_docs/audio10.pdf
39  *                  http://www.usb.org/developers/devclass_docs/frmts10.pdf
40  *                  http://www.usb.org/developers/devclass_docs/termt10.pdf
41  */
42 
43 /*
44  * Also merged:
45  *  $NetBSD: uaudio.c,v 1.94 2005/01/15 15:19:53 kent Exp $
46  *  $NetBSD: uaudio.c,v 1.95 2005/01/16 06:02:19 dsainty Exp $
47  *  $NetBSD: uaudio.c,v 1.96 2005/01/16 12:46:00 kent Exp $
48  *  $NetBSD: uaudio.c,v 1.97 2005/02/24 08:19:38 martin Exp $
49  */
50 
51 #include <sys/stdint.h>
52 #include <sys/stddef.h>
53 #include <sys/param.h>
54 #include <sys/queue.h>
55 #include <sys/types.h>
56 #include <sys/systm.h>
57 #include <sys/kernel.h>
58 #include <sys/bus.h>
59 #include <sys/module.h>
60 #include <sys/lock.h>
61 #include <sys/mutex.h>
62 #include <sys/condvar.h>
63 #include <sys/sysctl.h>
64 #include <sys/sx.h>
65 #include <sys/unistd.h>
66 #include <sys/callout.h>
67 #include <sys/malloc.h>
68 #include <sys/priv.h>
69 
70 #include "usbdevs.h"
71 #include <dev/usb/usb.h>
72 #include <dev/usb/usbdi.h>
73 #include <dev/usb/usbdi_util.h>
74 #include <dev/usb/usbhid.h>
75 #include <dev/usb/usb_request.h>
76 #include <dev/usb/usb_process.h>
77 
78 #define	USB_DEBUG_VAR uaudio_debug
79 #include <dev/usb/usb_debug.h>
80 
81 #include <dev/usb/quirk/usb_quirk.h>
82 
83 #include <sys/reboot.h>			/* for bootverbose */
84 
85 #ifdef HAVE_KERNEL_OPTION_HEADERS
86 #include "opt_snd.h"
87 #endif
88 
89 #include <dev/sound/pcm/sound.h>
90 #include <dev/sound/usb/uaudioreg.h>
91 #include <dev/sound/usb/uaudio.h>
92 #include <dev/sound/chip.h>
93 #include "feeder_if.h"
94 
95 static int uaudio_default_rate = 0;		/* use rate list */
96 static int uaudio_default_bits = 32;
97 static int uaudio_default_channels = 0;		/* use default */
98 
99 #ifdef USB_DEBUG
100 static int uaudio_debug = 0;
101 
102 static SYSCTL_NODE(_hw_usb, OID_AUTO, uaudio, CTLFLAG_RW, 0, "USB uaudio");
103 
104 SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, debug, CTLFLAG_RWTUN,
105     &uaudio_debug, 0, "uaudio debug level");
106 SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, default_rate, CTLFLAG_RWTUN,
107     &uaudio_default_rate, 0, "uaudio default sample rate");
108 SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, default_bits, CTLFLAG_RWTUN,
109     &uaudio_default_bits, 0, "uaudio default sample bits");
110 SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, default_channels, CTLFLAG_RWTUN,
111     &uaudio_default_channels, 0, "uaudio default sample channels");
112 #endif
113 
114 #define	UAUDIO_IRQS	(8000 / UAUDIO_NFRAMES)	/* interrupts per second */
115 #define	UAUDIO_NFRAMES		64	/* must be factor of 8 due HS-USB */
116 #define	UAUDIO_NCHANBUFS	2	/* number of outstanding request */
117 #define	UAUDIO_RECURSE_LIMIT	255	/* rounds */
118 #define	UAUDIO_CHANNELS_MAX	MIN(64, AFMT_CHANNEL_MAX)
119 #define	UAUDIO_MATRIX_MAX	8	/* channels */
120 
121 #define	MAKE_WORD(h,l) (((h) << 8) | (l))
122 #define	BIT_TEST(bm,bno) (((bm)[(bno) / 8] >> (7 - ((bno) % 8))) & 1)
123 #define	UAUDIO_MAX_CHAN(x) (x)
124 #define	MIX(sc) ((sc)->sc_mixer_node)
125 
126 union uaudio_asid {
127 	const struct usb_audio_streaming_interface_descriptor *v1;
128 	const struct usb_audio20_streaming_interface_descriptor *v2;
129 };
130 
131 union uaudio_asf1d {
132 	const struct usb_audio_streaming_type1_descriptor *v1;
133 	const struct usb_audio20_streaming_type1_descriptor *v2;
134 };
135 
136 union uaudio_sed {
137 	const struct usb_audio_streaming_endpoint_descriptor *v1;
138 	const struct usb_audio20_streaming_endpoint_descriptor *v2;
139 };
140 
141 struct uaudio_mixer_node {
142 	const char *name;
143 
144 	int32_t	minval;
145 	int32_t	maxval;
146 #define	MIX_MAX_CHAN 16
147 	int32_t	wValue[MIX_MAX_CHAN];	/* using nchan */
148 	uint32_t mul;
149 	uint32_t ctl;
150 
151 	int wData[MIX_MAX_CHAN];	/* using nchan */
152 	uint16_t wIndex;
153 
154 	uint8_t	update[(MIX_MAX_CHAN + 7) / 8];
155 	uint8_t	nchan;
156 	uint8_t	type;
157 #define	MIX_ON_OFF	1
158 #define	MIX_SIGNED_16	2
159 #define	MIX_UNSIGNED_16	3
160 #define	MIX_SIGNED_8	4
161 #define	MIX_SELECTOR	5
162 #define	MIX_UNKNOWN     6
163 #define	MIX_SIZE(n) ((((n) == MIX_SIGNED_16) || \
164 		      ((n) == MIX_UNSIGNED_16)) ? 2 : 1)
165 #define	MIX_UNSIGNED(n) ((n) == MIX_UNSIGNED_16)
166 
167 #define	MAX_SELECTOR_INPUT_PIN 256
168 	uint8_t	slctrtype[MAX_SELECTOR_INPUT_PIN];
169 	uint8_t	class;
170 	uint8_t val_default;
171 
172 	uint8_t desc[64];
173 
174 	struct uaudio_mixer_node *next;
175 };
176 
177 struct uaudio_configure_msg {
178 	struct usb_proc_msg hdr;
179 	struct uaudio_softc *sc;
180 };
181 
182 #define	CHAN_MAX_ALT 24
183 
184 struct uaudio_chan_alt {
185 	union uaudio_asf1d p_asf1d;
186 	union uaudio_sed p_sed;
187 	const usb_endpoint_descriptor_audio_t *p_ed1;
188 	const struct uaudio_format *p_fmt;
189 	const struct usb_config *usb_cfg;
190 	uint32_t sample_rate;	/* in Hz */
191 	uint16_t sample_size;
192 	uint8_t	iface_index;
193 	uint8_t	iface_alt_index;
194 	uint8_t channels;
195 };
196 
197 struct uaudio_chan {
198 	struct pcmchan_caps pcm_cap;	/* capabilities */
199 	struct uaudio_chan_alt usb_alt[CHAN_MAX_ALT];
200 	struct snd_dbuf *pcm_buf;
201 	struct mtx *pcm_mtx;		/* lock protecting this structure */
202 	struct uaudio_softc *priv_sc;
203 	struct pcm_channel *pcm_ch;
204 	struct usb_xfer *xfer[UAUDIO_NCHANBUFS + 1];
205 
206 	uint8_t *buf;			/* pointer to buffer */
207 	uint8_t *start;			/* upper layer buffer start */
208 	uint8_t *end;			/* upper layer buffer end */
209 	uint8_t *cur;			/* current position in upper layer
210 					 * buffer */
211 
212 	uint32_t intr_frames;		/* in units */
213 	uint32_t frames_per_second;
214 	uint32_t sample_rem;
215 	uint32_t sample_curr;
216 	uint32_t max_buf;
217 	int32_t jitter_rem;
218 	int32_t jitter_curr;
219 
220 	int feedback_rate;
221 
222 	uint32_t pcm_format[2];
223 
224 	uint16_t bytes_per_frame[2];
225 
226 	uint32_t intr_counter;
227 	uint32_t running;
228 	uint32_t num_alt;
229 	uint32_t cur_alt;
230 	uint32_t set_alt;
231 	uint32_t operation;
232 #define	CHAN_OP_NONE 0
233 #define	CHAN_OP_START 1
234 #define	CHAN_OP_STOP 2
235 #define	CHAN_OP_DRAIN 3
236 };
237 
238 #define	UMIDI_EMB_JACK_MAX   16		/* units */
239 #define	UMIDI_TX_FRAMES	   256		/* units */
240 #define	UMIDI_TX_BUFFER    (UMIDI_TX_FRAMES * 4)	/* bytes */
241 
242 enum {
243 	UMIDI_TX_TRANSFER,
244 	UMIDI_RX_TRANSFER,
245 	UMIDI_N_TRANSFER,
246 };
247 
248 struct umidi_sub_chan {
249 	struct usb_fifo_sc fifo;
250 	uint8_t *temp_cmd;
251 	uint8_t	temp_0[4];
252 	uint8_t	temp_1[4];
253 	uint8_t	state;
254 #define	UMIDI_ST_UNKNOWN   0		/* scan for command */
255 #define	UMIDI_ST_1PARAM    1
256 #define	UMIDI_ST_2PARAM_1  2
257 #define	UMIDI_ST_2PARAM_2  3
258 #define	UMIDI_ST_SYSEX_0   4
259 #define	UMIDI_ST_SYSEX_1   5
260 #define	UMIDI_ST_SYSEX_2   6
261 
262 	uint8_t	read_open:1;
263 	uint8_t	write_open:1;
264 	uint8_t	unused:6;
265 };
266 
267 struct umidi_chan {
268 
269 	struct umidi_sub_chan sub[UMIDI_EMB_JACK_MAX];
270 	struct mtx mtx;
271 
272 	struct usb_xfer *xfer[UMIDI_N_TRANSFER];
273 
274 	uint8_t	iface_index;
275 	uint8_t	iface_alt_index;
276 
277 	uint8_t	read_open_refcount;
278 	uint8_t	write_open_refcount;
279 
280 	uint8_t	curr_cable;
281 	uint8_t	max_emb_jack;
282 	uint8_t	valid;
283 	uint8_t single_command;
284 };
285 
286 struct uaudio_search_result {
287 	uint8_t	bit_input[(256 + 7) / 8];
288 	uint8_t	bit_output[(256 + 7) / 8];
289 	uint8_t	recurse_level;
290 	uint8_t	id_max;
291 	uint8_t is_input;
292 };
293 
294 enum {
295 	UAUDIO_HID_RX_TRANSFER,
296 	UAUDIO_HID_N_TRANSFER,
297 };
298 
299 struct uaudio_hid {
300 	struct usb_xfer *xfer[UAUDIO_HID_N_TRANSFER];
301 	struct hid_location volume_up_loc;
302 	struct hid_location volume_down_loc;
303 	struct hid_location mute_loc;
304 	uint32_t flags;
305 #define	UAUDIO_HID_VALID		0x0001
306 #define	UAUDIO_HID_HAS_ID		0x0002
307 #define	UAUDIO_HID_HAS_VOLUME_UP	0x0004
308 #define	UAUDIO_HID_HAS_VOLUME_DOWN	0x0008
309 #define	UAUDIO_HID_HAS_MUTE		0x0010
310 	uint8_t iface_index;
311 	uint8_t volume_up_id;
312 	uint8_t volume_down_id;
313 	uint8_t mute_id;
314 };
315 
316 struct uaudio_softc {
317 	struct sbuf sc_sndstat;
318 	struct sndcard_func sc_sndcard_func;
319 	struct uaudio_chan sc_rec_chan;
320 	struct uaudio_chan sc_play_chan;
321 	struct umidi_chan sc_midi_chan;
322 	struct uaudio_hid sc_hid;
323 	struct uaudio_search_result sc_mixer_clocks;
324 	struct uaudio_mixer_node sc_mixer_node;
325 	struct uaudio_configure_msg sc_config_msg[2];
326 
327 	struct mtx *sc_mixer_lock;
328 	struct snd_mixer *sc_mixer_dev;
329 	struct usb_device *sc_udev;
330 	struct usb_xfer *sc_mixer_xfer[1];
331 	struct uaudio_mixer_node *sc_mixer_root;
332 	struct uaudio_mixer_node *sc_mixer_curr;
333 
334 	uint32_t sc_mix_info;
335 	uint32_t sc_recsrc_info;
336 
337 	uint16_t sc_audio_rev;
338 	uint16_t sc_mixer_count;
339 
340 	uint8_t	sc_sndstat_valid;
341 	uint8_t	sc_mixer_iface_index;
342 	uint8_t	sc_mixer_iface_no;
343 	uint8_t	sc_mixer_chan;
344 	uint8_t	sc_pcm_registered:1;
345 	uint8_t	sc_mixer_init:1;
346 	uint8_t	sc_uq_audio_swap_lr:1;
347 	uint8_t	sc_uq_au_inp_async:1;
348 	uint8_t	sc_uq_au_no_xu:1;
349 	uint8_t	sc_uq_bad_adc:1;
350 	uint8_t	sc_uq_au_vendor_class:1;
351 	uint8_t	sc_pcm_bitperfect:1;
352 };
353 
354 struct uaudio_terminal_node {
355 	union {
356 		const struct usb_descriptor *desc;
357 		const struct usb_audio_input_terminal *it_v1;
358 		const struct usb_audio_output_terminal *ot_v1;
359 		const struct usb_audio_mixer_unit_0 *mu_v1;
360 		const struct usb_audio_selector_unit *su_v1;
361 		const struct usb_audio_feature_unit *fu_v1;
362 		const struct usb_audio_processing_unit_0 *pu_v1;
363 		const struct usb_audio_extension_unit_0 *eu_v1;
364 		const struct usb_audio20_clock_source_unit *csrc_v2;
365 		const struct usb_audio20_clock_selector_unit_0 *csel_v2;
366 		const struct usb_audio20_clock_multiplier_unit *cmul_v2;
367 		const struct usb_audio20_input_terminal *it_v2;
368 		const struct usb_audio20_output_terminal *ot_v2;
369 		const struct usb_audio20_mixer_unit_0 *mu_v2;
370 		const struct usb_audio20_selector_unit *su_v2;
371 		const struct usb_audio20_feature_unit *fu_v2;
372 		const struct usb_audio20_sample_rate_unit *ru_v2;
373 		const struct usb_audio20_processing_unit_0 *pu_v2;
374 		const struct usb_audio20_extension_unit_0 *eu_v2;
375 		const struct usb_audio20_effect_unit *ef_v2;
376 	}	u;
377 	struct uaudio_search_result usr;
378 	struct uaudio_terminal_node *root;
379 };
380 
381 struct uaudio_format {
382 	uint16_t wFormat;
383 	uint8_t	bPrecision;
384 	uint32_t freebsd_fmt;
385 	const char *description;
386 };
387 
388 static const struct uaudio_format uaudio10_formats[] = {
389 
390 	{UA_FMT_PCM8, 8, AFMT_U8, "8-bit U-LE PCM"},
391 	{UA_FMT_PCM8, 16, AFMT_U16_LE, "16-bit U-LE PCM"},
392 	{UA_FMT_PCM8, 24, AFMT_U24_LE, "24-bit U-LE PCM"},
393 	{UA_FMT_PCM8, 32, AFMT_U32_LE, "32-bit U-LE PCM"},
394 
395 	{UA_FMT_PCM, 8, AFMT_S8, "8-bit S-LE PCM"},
396 	{UA_FMT_PCM, 16, AFMT_S16_LE, "16-bit S-LE PCM"},
397 	{UA_FMT_PCM, 24, AFMT_S24_LE, "24-bit S-LE PCM"},
398 	{UA_FMT_PCM, 32, AFMT_S32_LE, "32-bit S-LE PCM"},
399 
400 	{UA_FMT_ALAW, 8, AFMT_A_LAW, "8-bit A-Law"},
401 	{UA_FMT_MULAW, 8, AFMT_MU_LAW, "8-bit mu-Law"},
402 
403 	{0, 0, 0, NULL}
404 };
405 
406 static const struct uaudio_format uaudio20_formats[] = {
407 
408 	{UA20_FMT_PCM, 8, AFMT_S8, "8-bit S-LE PCM"},
409 	{UA20_FMT_PCM, 16, AFMT_S16_LE, "16-bit S-LE PCM"},
410 	{UA20_FMT_PCM, 24, AFMT_S24_LE, "24-bit S-LE PCM"},
411 	{UA20_FMT_PCM, 32, AFMT_S32_LE, "32-bit S-LE PCM"},
412 
413 	{UA20_FMT_PCM8, 8, AFMT_U8, "8-bit U-LE PCM"},
414 	{UA20_FMT_PCM8, 16, AFMT_U16_LE, "16-bit U-LE PCM"},
415 	{UA20_FMT_PCM8, 24, AFMT_U24_LE, "24-bit U-LE PCM"},
416 	{UA20_FMT_PCM8, 32, AFMT_U32_LE, "32-bit U-LE PCM"},
417 
418 	{UA20_FMT_ALAW, 8, AFMT_A_LAW, "8-bit A-Law"},
419 	{UA20_FMT_MULAW, 8, AFMT_MU_LAW, "8-bit mu-Law"},
420 
421 	{0, 0, 0, NULL}
422 };
423 
424 #define	UAC_OUTPUT	0
425 #define	UAC_INPUT	1
426 #define	UAC_EQUAL	2
427 #define	UAC_RECORD	3
428 #define	UAC_NCLASSES	4
429 
430 #ifdef USB_DEBUG
431 static const char *uac_names[] = {
432 	"outputs", "inputs", "equalization", "record"
433 };
434 
435 #endif
436 
437 /* prototypes */
438 
439 static device_probe_t uaudio_probe;
440 static device_attach_t uaudio_attach;
441 static device_detach_t uaudio_detach;
442 
443 static usb_callback_t uaudio_chan_play_callback;
444 static usb_callback_t uaudio_chan_play_sync_callback;
445 static usb_callback_t uaudio_chan_record_callback;
446 static usb_callback_t uaudio_chan_record_sync_callback;
447 static usb_callback_t uaudio_mixer_write_cfg_callback;
448 static usb_callback_t umidi_bulk_read_callback;
449 static usb_callback_t umidi_bulk_write_callback;
450 static usb_callback_t uaudio_hid_rx_callback;
451 
452 static usb_proc_callback_t uaudio_configure_msg;
453 
454 /* ==== USB mixer ==== */
455 
456 static int uaudio_mixer_sysctl_handler(SYSCTL_HANDLER_ARGS);
457 static void uaudio_mixer_ctl_free(struct uaudio_softc *);
458 static void uaudio_mixer_register_sysctl(struct uaudio_softc *, device_t);
459 static void uaudio_mixer_reload_all(struct uaudio_softc *);
460 static void uaudio_mixer_controls_create_ftu(struct uaudio_softc *);
461 
462 /* ==== USB audio v1.0 ==== */
463 
464 static void	uaudio_mixer_add_mixer(struct uaudio_softc *,
465 		    const struct uaudio_terminal_node *, int);
466 static void	uaudio_mixer_add_selector(struct uaudio_softc *,
467 		    const struct uaudio_terminal_node *, int);
468 static uint32_t	uaudio_mixer_feature_get_bmaControls(
469 		    const struct usb_audio_feature_unit *, uint8_t);
470 static void	uaudio_mixer_add_feature(struct uaudio_softc *,
471 		    const struct uaudio_terminal_node *, int);
472 static void	uaudio_mixer_add_processing_updown(struct uaudio_softc *,
473 		    const struct uaudio_terminal_node *, int);
474 static void	uaudio_mixer_add_processing(struct uaudio_softc *,
475 		    const struct uaudio_terminal_node *, int);
476 static void	uaudio_mixer_add_extension(struct uaudio_softc *,
477 		    const struct uaudio_terminal_node *, int);
478 static struct	usb_audio_cluster uaudio_mixer_get_cluster(uint8_t,
479 		    const struct uaudio_terminal_node *);
480 static uint16_t	uaudio_mixer_determine_class(const struct uaudio_terminal_node *,
481 		    struct uaudio_mixer_node *);
482 static uint16_t	uaudio_mixer_feature_name(const struct uaudio_terminal_node *,
483 		    struct uaudio_mixer_node *);
484 static void	uaudio_mixer_find_inputs_sub(struct uaudio_terminal_node *,
485 		    const uint8_t *, uint8_t, struct uaudio_search_result *);
486 static const void *uaudio_mixer_verify_desc(const void *, uint32_t);
487 static usb_error_t uaudio_set_speed(struct usb_device *, uint8_t, uint32_t);
488 static int	uaudio_mixer_get(struct usb_device *, uint16_t, uint8_t,
489 		    struct uaudio_mixer_node *);
490 
491 /* ==== USB audio v2.0 ==== */
492 
493 static void	uaudio20_mixer_add_mixer(struct uaudio_softc *,
494 		    const struct uaudio_terminal_node *, int);
495 static void	uaudio20_mixer_add_selector(struct uaudio_softc *,
496 		    const struct uaudio_terminal_node *, int);
497 static void	uaudio20_mixer_add_feature(struct uaudio_softc *,
498 		    const struct uaudio_terminal_node *, int);
499 static struct	usb_audio20_cluster uaudio20_mixer_get_cluster(uint8_t,
500 		    const struct uaudio_terminal_node *);
501 static uint16_t	uaudio20_mixer_determine_class(const struct uaudio_terminal_node *,
502 		    struct uaudio_mixer_node *);
503 static uint16_t	uaudio20_mixer_feature_name(const struct uaudio_terminal_node *,
504 		    struct uaudio_mixer_node *);
505 static void	uaudio20_mixer_find_inputs_sub(struct uaudio_terminal_node *,
506 		    const uint8_t *, uint8_t, struct uaudio_search_result *);
507 static const void *uaudio20_mixer_verify_desc(const void *, uint32_t);
508 static usb_error_t uaudio20_set_speed(struct usb_device *, uint8_t,
509 		    uint8_t, uint32_t);
510 
511 /* USB audio v1.0 and v2.0 */
512 
513 static void	uaudio_chan_fill_info_sub(struct uaudio_softc *,
514 		    struct usb_device *, uint32_t, uint8_t, uint8_t);
515 static void	uaudio_chan_fill_info(struct uaudio_softc *,
516 		    struct usb_device *);
517 static void	uaudio_mixer_add_ctl_sub(struct uaudio_softc *,
518 		    struct uaudio_mixer_node *);
519 static void	uaudio_mixer_add_ctl(struct uaudio_softc *,
520 		    struct uaudio_mixer_node *);
521 static void	uaudio_mixer_fill_info(struct uaudio_softc *,
522 		    struct usb_device *, void *);
523 static void	uaudio_mixer_ctl_set(struct uaudio_softc *,
524 		    struct uaudio_mixer_node *, uint8_t, int32_t val);
525 static int	uaudio_mixer_signext(uint8_t, int);
526 static int	uaudio_mixer_bsd2value(struct uaudio_mixer_node *, int32_t val);
527 static void	uaudio_mixer_init(struct uaudio_softc *);
528 static const struct uaudio_terminal_node *uaudio_mixer_get_input(
529 		    const struct uaudio_terminal_node *, uint8_t);
530 static const struct uaudio_terminal_node *uaudio_mixer_get_output(
531 		    const struct uaudio_terminal_node *, uint8_t);
532 static void	uaudio_mixer_find_outputs_sub(struct uaudio_terminal_node *,
533 		    uint8_t, uint8_t, struct uaudio_search_result *);
534 static uint8_t	umidi_convert_to_usb(struct umidi_sub_chan *, uint8_t, uint8_t);
535 static struct	umidi_sub_chan *umidi_sub_by_fifo(struct usb_fifo *);
536 static void	umidi_start_read(struct usb_fifo *);
537 static void	umidi_stop_read(struct usb_fifo *);
538 static void	umidi_start_write(struct usb_fifo *);
539 static void	umidi_stop_write(struct usb_fifo *);
540 static int	umidi_open(struct usb_fifo *, int);
541 static int	umidi_ioctl(struct usb_fifo *, u_long cmd, void *, int);
542 static void	umidi_close(struct usb_fifo *, int);
543 static void	umidi_init(device_t dev);
544 static int	umidi_probe(device_t dev);
545 static int	umidi_detach(device_t dev);
546 static int	uaudio_hid_probe(struct uaudio_softc *sc,
547 		    struct usb_attach_arg *uaa);
548 static void	uaudio_hid_detach(struct uaudio_softc *sc);
549 
550 #ifdef USB_DEBUG
551 static void	uaudio_chan_dump_ep_desc(
552 		    const usb_endpoint_descriptor_audio_t *);
553 #endif
554 
555 static const struct usb_config
556 	uaudio_cfg_record[UAUDIO_NCHANBUFS + 1] = {
557 	[0] = {
558 		.type = UE_ISOCHRONOUS,
559 		.endpoint = UE_ADDR_ANY,
560 		.direction = UE_DIR_IN,
561 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
562 		.frames = UAUDIO_NFRAMES,
563 		.flags = {.short_xfer_ok = 1,},
564 		.callback = &uaudio_chan_record_callback,
565 	},
566 
567 	[1] = {
568 		.type = UE_ISOCHRONOUS,
569 		.endpoint = UE_ADDR_ANY,
570 		.direction = UE_DIR_IN,
571 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
572 		.frames = UAUDIO_NFRAMES,
573 		.flags = {.short_xfer_ok = 1,},
574 		.callback = &uaudio_chan_record_callback,
575 	},
576 
577 	[2] = {
578 		.type = UE_ISOCHRONOUS,
579 		.endpoint = UE_ADDR_ANY,
580 		.direction = UE_DIR_OUT,
581 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
582 		.frames = 1,
583 		.flags = {.no_pipe_ok = 1,.short_xfer_ok = 1,},
584 		.callback = &uaudio_chan_record_sync_callback,
585 	},
586 };
587 
588 static const struct usb_config
589 	uaudio_cfg_play[UAUDIO_NCHANBUFS + 1] = {
590 	[0] = {
591 		.type = UE_ISOCHRONOUS,
592 		.endpoint = UE_ADDR_ANY,
593 		.direction = UE_DIR_OUT,
594 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
595 		.frames = UAUDIO_NFRAMES,
596 		.flags = {.short_xfer_ok = 1,},
597 		.callback = &uaudio_chan_play_callback,
598 	},
599 
600 	[1] = {
601 		.type = UE_ISOCHRONOUS,
602 		.endpoint = UE_ADDR_ANY,
603 		.direction = UE_DIR_OUT,
604 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
605 		.frames = UAUDIO_NFRAMES,
606 		.flags = {.short_xfer_ok = 1,},
607 		.callback = &uaudio_chan_play_callback,
608 	},
609 
610 	[2] = {
611 		.type = UE_ISOCHRONOUS,
612 		.endpoint = UE_ADDR_ANY,
613 		.direction = UE_DIR_IN,
614 		.bufsize = 0,	/* use "wMaxPacketSize * frames" */
615 		.frames = 1,
616 		.flags = {.no_pipe_ok = 1,.short_xfer_ok = 1,},
617 		.callback = &uaudio_chan_play_sync_callback,
618 	},
619 };
620 
621 static const struct usb_config
622 	uaudio_mixer_config[1] = {
623 	[0] = {
624 		.type = UE_CONTROL,
625 		.endpoint = 0x00,	/* Control pipe */
626 		.direction = UE_DIR_ANY,
627 		.bufsize = (sizeof(struct usb_device_request) + 4),
628 		.callback = &uaudio_mixer_write_cfg_callback,
629 		.timeout = 1000,	/* 1 second */
630 	},
631 };
632 
633 static const
634 uint8_t	umidi_cmd_to_len[16] = {
635 	[0x0] = 0,			/* reserved */
636 	[0x1] = 0,			/* reserved */
637 	[0x2] = 2,			/* bytes */
638 	[0x3] = 3,			/* bytes */
639 	[0x4] = 3,			/* bytes */
640 	[0x5] = 1,			/* bytes */
641 	[0x6] = 2,			/* bytes */
642 	[0x7] = 3,			/* bytes */
643 	[0x8] = 3,			/* bytes */
644 	[0x9] = 3,			/* bytes */
645 	[0xA] = 3,			/* bytes */
646 	[0xB] = 3,			/* bytes */
647 	[0xC] = 2,			/* bytes */
648 	[0xD] = 2,			/* bytes */
649 	[0xE] = 3,			/* bytes */
650 	[0xF] = 1,			/* bytes */
651 };
652 
653 static const struct usb_config
654 	umidi_config[UMIDI_N_TRANSFER] = {
655 	[UMIDI_TX_TRANSFER] = {
656 		.type = UE_BULK,
657 		.endpoint = UE_ADDR_ANY,
658 		.direction = UE_DIR_OUT,
659 		.bufsize = UMIDI_TX_BUFFER,
660 		.callback = &umidi_bulk_write_callback,
661 	},
662 
663 	[UMIDI_RX_TRANSFER] = {
664 		.type = UE_BULK,
665 		.endpoint = UE_ADDR_ANY,
666 		.direction = UE_DIR_IN,
667 		.bufsize = 4,	/* bytes */
668 		.flags = {.short_xfer_ok = 1,.proxy_buffer = 1,},
669 		.callback = &umidi_bulk_read_callback,
670 	},
671 };
672 
673 static const struct usb_config
674 	uaudio_hid_config[UAUDIO_HID_N_TRANSFER] = {
675 	[UAUDIO_HID_RX_TRANSFER] = {
676 		.type = UE_INTERRUPT,
677 		.endpoint = UE_ADDR_ANY,
678 		.direction = UE_DIR_IN,
679 		.bufsize = 0,	/* use wMaxPacketSize */
680 		.flags = {.short_xfer_ok = 1,},
681 		.callback = &uaudio_hid_rx_callback,
682 	},
683 };
684 
685 static devclass_t uaudio_devclass;
686 
687 static device_method_t uaudio_methods[] = {
688 	DEVMETHOD(device_probe, uaudio_probe),
689 	DEVMETHOD(device_attach, uaudio_attach),
690 	DEVMETHOD(device_detach, uaudio_detach),
691 	DEVMETHOD(device_suspend, bus_generic_suspend),
692 	DEVMETHOD(device_resume, bus_generic_resume),
693 	DEVMETHOD(device_shutdown, bus_generic_shutdown),
694 
695 	DEVMETHOD_END
696 };
697 
698 static driver_t uaudio_driver = {
699 	.name = "uaudio",
700 	.methods = uaudio_methods,
701 	.size = sizeof(struct uaudio_softc),
702 };
703 
704 /* The following table is derived from Linux's quirks-table.h */
705 static const STRUCT_USB_HOST_ID uaudio_vendor_midi[] = {
706 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1000, 0) }, /* UX256 */
707 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1001, 0) }, /* MU1000 */
708 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1002, 0) }, /* MU2000 */
709 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1003, 0) }, /* MU500 */
710 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1004, 3) }, /* UW500 */
711 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1005, 0) }, /* MOTIF6 */
712 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1006, 0) }, /* MOTIF7 */
713 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1007, 0) }, /* MOTIF8 */
714 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1008, 0) }, /* UX96 */
715 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1009, 0) }, /* UX16 */
716 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x100a, 3) }, /* EOS BX */
717 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x100c, 0) }, /* UC-MX */
718 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x100d, 0) }, /* UC-KX */
719 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x100e, 0) }, /* S08 */
720 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x100f, 0) }, /* CLP-150 */
721 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1010, 0) }, /* CLP-170 */
722 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1011, 0) }, /* P-250 */
723 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1012, 0) }, /* TYROS */
724 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1013, 0) }, /* PF-500 */
725 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1014, 0) }, /* S90 */
726 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1015, 0) }, /* MOTIF-R */
727 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1016, 0) }, /* MDP-5 */
728 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1017, 0) }, /* CVP-204 */
729 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1018, 0) }, /* CVP-206 */
730 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1019, 0) }, /* CVP-208 */
731 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101a, 0) }, /* CVP-210 */
732 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101b, 0) }, /* PSR-1100 */
733 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101c, 0) }, /* PSR-2100 */
734 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101d, 0) }, /* CLP-175 */
735 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101e, 0) }, /* PSR-K1 */
736 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x101f, 0) }, /* EZ-J24 */
737 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1020, 0) }, /* EZ-250i */
738 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1021, 0) }, /* MOTIF ES 6 */
739 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1022, 0) }, /* MOTIF ES 7 */
740 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1023, 0) }, /* MOTIF ES 8 */
741 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1024, 0) }, /* CVP-301 */
742 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1025, 0) }, /* CVP-303 */
743 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1026, 0) }, /* CVP-305 */
744 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1027, 0) }, /* CVP-307 */
745 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1028, 0) }, /* CVP-309 */
746 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1029, 0) }, /* CVP-309GP */
747 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x102a, 0) }, /* PSR-1500 */
748 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x102b, 0) }, /* PSR-3000 */
749 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x102e, 0) }, /* ELS-01/01C */
750 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1030, 0) }, /* PSR-295/293 */
751 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1031, 0) }, /* DGX-205/203 */
752 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1032, 0) }, /* DGX-305 */
753 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1033, 0) }, /* DGX-505 */
754 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1034, 0) }, /* NULL */
755 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1035, 0) }, /* NULL */
756 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1036, 0) }, /* NULL */
757 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1037, 0) }, /* NULL */
758 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1038, 0) }, /* NULL */
759 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1039, 0) }, /* NULL */
760 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103a, 0) }, /* NULL */
761 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103b, 0) }, /* NULL */
762 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103c, 0) }, /* NULL */
763 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103d, 0) }, /* NULL */
764 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103e, 0) }, /* NULL */
765 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x103f, 0) }, /* NULL */
766 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1040, 0) }, /* NULL */
767 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1041, 0) }, /* NULL */
768 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1042, 0) }, /* NULL */
769 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1043, 0) }, /* NULL */
770 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1044, 0) }, /* NULL */
771 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1045, 0) }, /* NULL */
772 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x104e, 0) }, /* NULL */
773 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x104f, 0) }, /* NULL */
774 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1050, 0) }, /* NULL */
775 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1051, 0) }, /* NULL */
776 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1052, 0) }, /* NULL */
777 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1053, 0) }, /* NULL */
778 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1054, 0) }, /* NULL */
779 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1055, 0) }, /* NULL */
780 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1056, 0) }, /* NULL */
781 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1057, 0) }, /* NULL */
782 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1058, 0) }, /* NULL */
783 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1059, 0) }, /* NULL */
784 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x105a, 0) }, /* NULL */
785 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x105b, 0) }, /* NULL */
786 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x105c, 0) }, /* NULL */
787 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x105d, 0) }, /* NULL */
788 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x1503, 3) }, /* MOX6/MOX8 */
789 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x2000, 0) }, /* DGP-7 */
790 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x2001, 0) }, /* DGP-5 */
791 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x2002, 0) }, /* NULL */
792 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x2003, 0) }, /* NULL */
793 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5000, 0) }, /* CS1D */
794 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5001, 0) }, /* DSP1D */
795 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5002, 0) }, /* DME32 */
796 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5003, 0) }, /* DM2000 */
797 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5004, 0) }, /* 02R96 */
798 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5005, 0) }, /* ACU16-C */
799 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5006, 0) }, /* NHB32-C */
800 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5007, 0) }, /* DM1000 */
801 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5008, 0) }, /* 01V96 */
802 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x5009, 0) }, /* SPX2000 */
803 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500a, 0) }, /* PM5D */
804 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500b, 0) }, /* DME64N */
805 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500c, 0) }, /* DME24N */
806 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500d, 0) }, /* NULL */
807 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500e, 0) }, /* NULL */
808 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x500f, 0) }, /* NULL */
809 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x7000, 0) }, /* DTX */
810 	{ USB_VPI(USB_VENDOR_YAMAHA, 0x7010, 0) }, /* UB99 */
811 };
812 
813 static const STRUCT_USB_HOST_ID __used uaudio_devs[] = {
814 	/* Generic USB audio class match */
815 	{USB_IFACE_CLASS(UICLASS_AUDIO),
816 	 USB_IFACE_SUBCLASS(UISUBCLASS_AUDIOCONTROL),},
817 	/* Generic USB MIDI class match */
818 	{USB_IFACE_CLASS(UICLASS_AUDIO),
819 	 USB_IFACE_SUBCLASS(UISUBCLASS_MIDISTREAM),},
820 };
821 
822 static int
823 uaudio_probe(device_t dev)
824 {
825 	struct usb_attach_arg *uaa = device_get_ivars(dev);
826 
827 	if (uaa->usb_mode != USB_MODE_HOST)
828 		return (ENXIO);
829 
830 	/* lookup non-standard device(s) */
831 
832 	if (usbd_lookup_id_by_uaa(uaudio_vendor_midi,
833 	    sizeof(uaudio_vendor_midi), uaa) == 0) {
834 		return (BUS_PROBE_SPECIFIC);
835 	}
836 
837 	if (uaa->info.bInterfaceClass != UICLASS_AUDIO) {
838 		if (uaa->info.bInterfaceClass != UICLASS_VENDOR ||
839 		    usb_test_quirk(uaa, UQ_AU_VENDOR_CLASS) == 0)
840 			return (ENXIO);
841 	}
842 
843 	/* check for AUDIO control interface */
844 
845 	if (uaa->info.bInterfaceSubClass == UISUBCLASS_AUDIOCONTROL) {
846 		if (usb_test_quirk(uaa, UQ_BAD_AUDIO))
847 			return (ENXIO);
848 		else
849 			return (BUS_PROBE_GENERIC);
850 	}
851 
852 	/* check for MIDI stream */
853 
854 	if (uaa->info.bInterfaceSubClass == UISUBCLASS_MIDISTREAM) {
855 		if (usb_test_quirk(uaa, UQ_BAD_MIDI))
856 			return (ENXIO);
857 		else
858 			return (BUS_PROBE_GENERIC);
859 	}
860 	return (ENXIO);
861 }
862 
863 static int
864 uaudio_attach(device_t dev)
865 {
866 	struct usb_attach_arg *uaa = device_get_ivars(dev);
867 	struct uaudio_softc *sc = device_get_softc(dev);
868 	struct usb_interface_descriptor *id;
869 	usb_error_t err;
870 	device_t child;
871 
872 	sc->sc_play_chan.priv_sc = sc;
873 	sc->sc_rec_chan.priv_sc = sc;
874 	sc->sc_udev = uaa->device;
875 	sc->sc_mixer_iface_index = uaa->info.bIfaceIndex;
876 	sc->sc_mixer_iface_no = uaa->info.bIfaceNum;
877 	sc->sc_config_msg[0].hdr.pm_callback = &uaudio_configure_msg;
878 	sc->sc_config_msg[0].sc = sc;
879 	sc->sc_config_msg[1].hdr.pm_callback = &uaudio_configure_msg;
880 	sc->sc_config_msg[1].sc = sc;
881 
882 	if (usb_test_quirk(uaa, UQ_AUDIO_SWAP_LR))
883 		sc->sc_uq_audio_swap_lr = 1;
884 
885 	if (usb_test_quirk(uaa, UQ_AU_INP_ASYNC))
886 		sc->sc_uq_au_inp_async = 1;
887 
888 	if (usb_test_quirk(uaa, UQ_AU_NO_XU))
889 		sc->sc_uq_au_no_xu = 1;
890 
891 	if (usb_test_quirk(uaa, UQ_BAD_ADC))
892 		sc->sc_uq_bad_adc = 1;
893 
894 	if (usb_test_quirk(uaa, UQ_AU_VENDOR_CLASS))
895 		sc->sc_uq_au_vendor_class = 1;
896 
897 	umidi_init(dev);
898 
899 	device_set_usb_desc(dev);
900 
901 	id = usbd_get_interface_descriptor(uaa->iface);
902 
903 	/* must fill mixer info before channel info */
904 	uaudio_mixer_fill_info(sc, uaa->device, id);
905 
906 	/* fill channel info */
907 	uaudio_chan_fill_info(sc, uaa->device);
908 
909 	DPRINTF("audio rev %d.%02x\n",
910 	    sc->sc_audio_rev >> 8,
911 	    sc->sc_audio_rev & 0xff);
912 
913 	if (sc->sc_mixer_count == 0) {
914 		if (uaa->info.idVendor == USB_VENDOR_MAUDIO &&
915 		    (uaa->info.idProduct == USB_PRODUCT_MAUDIO_FASTTRACKULTRA ||
916 		    uaa->info.idProduct == USB_PRODUCT_MAUDIO_FASTTRACKULTRA8R)) {
917 			DPRINTF("Generating mixer descriptors\n");
918 			uaudio_mixer_controls_create_ftu(sc);
919 		}
920 	}
921 
922 	DPRINTF("%d mixer controls\n",
923 	    sc->sc_mixer_count);
924 
925 	if (sc->sc_play_chan.num_alt > 0) {
926 		uint8_t x;
927 
928 		/*
929 		 * Need to set a default alternate interface, else
930 		 * some USB audio devices might go into an infinte
931 		 * re-enumeration loop:
932 		 */
933 		err = usbd_set_alt_interface_index(sc->sc_udev,
934 		    sc->sc_play_chan.usb_alt[0].iface_index,
935 		    sc->sc_play_chan.usb_alt[0].iface_alt_index);
936 		if (err) {
937 			DPRINTF("setting of alternate index failed: %s!\n",
938 			    usbd_errstr(err));
939 		}
940 		for (x = 0; x != sc->sc_play_chan.num_alt; x++) {
941 			device_printf(dev, "Play: %d Hz, %d ch, %s format, "
942 			    "2x8ms buffer.\n",
943 			    sc->sc_play_chan.usb_alt[x].sample_rate,
944 			    sc->sc_play_chan.usb_alt[x].channels,
945 			    sc->sc_play_chan.usb_alt[x].p_fmt->description);
946 		}
947 	} else {
948 		device_printf(dev, "No playback.\n");
949 	}
950 
951 	if (sc->sc_rec_chan.num_alt > 0) {
952 		uint8_t x;
953 
954 		/*
955 		 * Need to set a default alternate interface, else
956 		 * some USB audio devices might go into an infinte
957 		 * re-enumeration loop:
958 		 */
959 		err = usbd_set_alt_interface_index(sc->sc_udev,
960 		    sc->sc_rec_chan.usb_alt[0].iface_index,
961 		    sc->sc_rec_chan.usb_alt[0].iface_alt_index);
962 		if (err) {
963 			DPRINTF("setting of alternate index failed: %s!\n",
964 			    usbd_errstr(err));
965 		}
966 		for (x = 0; x != sc->sc_rec_chan.num_alt; x++) {
967 			device_printf(dev, "Record: %d Hz, %d ch, %s format, "
968 			    "2x8ms buffer.\n",
969 			    sc->sc_rec_chan.usb_alt[x].sample_rate,
970 			    sc->sc_rec_chan.usb_alt[x].channels,
971 			    sc->sc_rec_chan.usb_alt[x].p_fmt->description);
972 		}
973 	} else {
974 		device_printf(dev, "No recording.\n");
975 	}
976 
977 	if (sc->sc_midi_chan.valid == 0) {
978 		if (usbd_lookup_id_by_uaa(uaudio_vendor_midi,
979 		    sizeof(uaudio_vendor_midi), uaa) == 0) {
980 			sc->sc_midi_chan.iface_index =
981 			    (uint8_t)uaa->driver_info;
982 			sc->sc_midi_chan.iface_alt_index = 0;
983 			sc->sc_midi_chan.valid = 1;
984 		}
985 	}
986 
987 	if (sc->sc_midi_chan.valid) {
988 
989 		if (umidi_probe(dev)) {
990 			goto detach;
991 		}
992 		device_printf(dev, "MIDI sequencer.\n");
993 	} else {
994 		device_printf(dev, "No MIDI sequencer.\n");
995 	}
996 
997 	DPRINTF("doing child attach\n");
998 
999 	/* attach the children */
1000 
1001 	sc->sc_sndcard_func.func = SCF_PCM;
1002 
1003 	/*
1004 	 * Only attach a PCM device if we have a playback, recording
1005 	 * or mixer device present:
1006 	 */
1007 	if (sc->sc_play_chan.num_alt > 0 ||
1008 	    sc->sc_rec_chan.num_alt > 0 ||
1009 	    sc->sc_mix_info) {
1010 		child = device_add_child(dev, "pcm", -1);
1011 
1012 		if (child == NULL) {
1013 			DPRINTF("out of memory\n");
1014 			goto detach;
1015 		}
1016 		device_set_ivars(child, &sc->sc_sndcard_func);
1017 	}
1018 
1019 	if (bus_generic_attach(dev)) {
1020 		DPRINTF("child attach failed\n");
1021 		goto detach;
1022 	}
1023 
1024 	if (uaudio_hid_probe(sc, uaa) == 0) {
1025 		device_printf(dev, "HID volume keys found.\n");
1026 	} else {
1027 		device_printf(dev, "No HID volume keys found.\n");
1028 	}
1029 
1030 	/* reload all mixer settings */
1031 	uaudio_mixer_reload_all(sc);
1032 
1033 	return (0);			/* success */
1034 
1035 detach:
1036 	uaudio_detach(dev);
1037 	return (ENXIO);
1038 }
1039 
1040 static void
1041 uaudio_pcm_setflags(device_t dev, uint32_t flags)
1042 {
1043 	pcm_setflags(dev, pcm_getflags(dev) | flags);
1044 }
1045 
1046 int
1047 uaudio_attach_sub(device_t dev, kobj_class_t mixer_class, kobj_class_t chan_class)
1048 {
1049 	struct uaudio_softc *sc = device_get_softc(device_get_parent(dev));
1050 	char status[SND_STATUSLEN];
1051 
1052 	uaudio_mixer_init(sc);
1053 
1054 	if (sc->sc_uq_audio_swap_lr) {
1055 		DPRINTF("hardware has swapped left and right\n");
1056 		/* uaudio_pcm_setflags(dev, SD_F_PSWAPLR); */
1057 	}
1058 	if (!(sc->sc_mix_info & SOUND_MASK_PCM)) {
1059 
1060 		DPRINTF("emulating master volume\n");
1061 
1062 		/*
1063 		 * Emulate missing pcm mixer controller
1064 		 * through FEEDER_VOLUME
1065 		 */
1066 		uaudio_pcm_setflags(dev, SD_F_SOFTPCMVOL);
1067 	}
1068 	if (sc->sc_pcm_bitperfect) {
1069 		DPRINTF("device needs bitperfect by default\n");
1070 		uaudio_pcm_setflags(dev, SD_F_BITPERFECT);
1071 	}
1072 	if (mixer_init(dev, mixer_class, sc))
1073 		goto detach;
1074 	sc->sc_mixer_init = 1;
1075 
1076 	mixer_hwvol_init(dev);
1077 
1078 	snprintf(status, sizeof(status), "at ? %s", PCM_KLDSTRING(snd_uaudio));
1079 
1080 	if (pcm_register(dev, sc,
1081 	    (sc->sc_play_chan.num_alt > 0) ? 1 : 0,
1082 	    (sc->sc_rec_chan.num_alt > 0) ? 1 : 0)) {
1083 		goto detach;
1084 	}
1085 
1086 	uaudio_pcm_setflags(dev, SD_F_MPSAFE);
1087 	sc->sc_pcm_registered = 1;
1088 
1089 	if (sc->sc_play_chan.num_alt > 0) {
1090 		pcm_addchan(dev, PCMDIR_PLAY, chan_class, sc);
1091 	}
1092 	if (sc->sc_rec_chan.num_alt > 0) {
1093 		pcm_addchan(dev, PCMDIR_REC, chan_class, sc);
1094 	}
1095 	pcm_setstatus(dev, status);
1096 
1097 	uaudio_mixer_register_sysctl(sc, dev);
1098 
1099 	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
1100 	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
1101 	    "feedback_rate", CTLFLAG_RD, &sc->sc_play_chan.feedback_rate,
1102 	    0, "Feedback sample rate in Hz");
1103 
1104 	return (0);			/* success */
1105 
1106 detach:
1107 	uaudio_detach_sub(dev);
1108 	return (ENXIO);
1109 }
1110 
1111 int
1112 uaudio_detach_sub(device_t dev)
1113 {
1114 	struct uaudio_softc *sc = device_get_softc(device_get_parent(dev));
1115 	int error = 0;
1116 
1117 repeat:
1118 	if (sc->sc_pcm_registered) {
1119 		error = pcm_unregister(dev);
1120 	} else {
1121 		if (sc->sc_mixer_init) {
1122 			error = mixer_uninit(dev);
1123 		}
1124 	}
1125 
1126 	if (error) {
1127 		device_printf(dev, "Waiting for sound application to exit!\n");
1128 		usb_pause_mtx(NULL, 2 * hz);
1129 		goto repeat;		/* try again */
1130 	}
1131 	return (0);			/* success */
1132 }
1133 
1134 static int
1135 uaudio_detach(device_t dev)
1136 {
1137 	struct uaudio_softc *sc = device_get_softc(dev);
1138 
1139 	/*
1140 	 * Stop USB transfers early so that any audio applications
1141 	 * will time out and close opened /dev/dspX.Y device(s), if
1142 	 * any.
1143 	 */
1144 	usb_proc_explore_lock(sc->sc_udev);
1145 	sc->sc_play_chan.operation = CHAN_OP_DRAIN;
1146 	sc->sc_rec_chan.operation = CHAN_OP_DRAIN;
1147 	usb_proc_explore_mwait(sc->sc_udev,
1148 	    &sc->sc_config_msg[0], &sc->sc_config_msg[1]);
1149 	usb_proc_explore_unlock(sc->sc_udev);
1150 
1151 	usbd_transfer_unsetup(sc->sc_play_chan.xfer, UAUDIO_NCHANBUFS + 1);
1152 	usbd_transfer_unsetup(sc->sc_rec_chan.xfer, UAUDIO_NCHANBUFS + 1);
1153 
1154 	uaudio_hid_detach(sc);
1155 
1156 	if (bus_generic_detach(dev) != 0) {
1157 		DPRINTF("detach failed!\n");
1158 	}
1159 	sbuf_delete(&sc->sc_sndstat);
1160 	sc->sc_sndstat_valid = 0;
1161 
1162 	umidi_detach(dev);
1163 
1164 	/* free mixer data */
1165 
1166 	uaudio_mixer_ctl_free(sc);
1167 
1168 	return (0);
1169 }
1170 
1171 static uint32_t
1172 uaudio_get_buffer_size(struct uaudio_chan *ch, uint8_t alt)
1173 {
1174 	struct uaudio_chan_alt *chan_alt = &ch->usb_alt[alt];
1175 	/* We use 2 times 8ms of buffer */
1176 	uint32_t buf_size = (((chan_alt->sample_rate * (UAUDIO_NFRAMES / 8)) +
1177 	    1000 - 1) / 1000) * chan_alt->sample_size;
1178 	return (buf_size);
1179 }
1180 
1181 static void
1182 uaudio_configure_msg_sub(struct uaudio_softc *sc,
1183     struct uaudio_chan *chan, int dir)
1184 {
1185 	struct uaudio_chan_alt *chan_alt;
1186 	uint32_t frames;
1187 	uint32_t buf_size;
1188 	uint16_t fps;
1189 	uint8_t set_alt;
1190 	uint8_t fps_shift;
1191 	uint8_t operation;
1192 	usb_error_t err;
1193 
1194 	if (chan->num_alt <= 0)
1195 		return;
1196 
1197 	DPRINTF("\n");
1198 
1199 	usb_proc_explore_lock(sc->sc_udev);
1200 	operation = chan->operation;
1201 	chan->operation = CHAN_OP_NONE;
1202 	usb_proc_explore_unlock(sc->sc_udev);
1203 
1204 	mtx_lock(chan->pcm_mtx);
1205 	if (chan->cur_alt != chan->set_alt)
1206 		set_alt = chan->set_alt;
1207 	else
1208 		set_alt = CHAN_MAX_ALT;
1209 	mtx_unlock(chan->pcm_mtx);
1210 
1211 	if (set_alt >= chan->num_alt)
1212 		goto done;
1213 
1214 	chan_alt = chan->usb_alt + set_alt;
1215 
1216 	usbd_transfer_unsetup(chan->xfer, UAUDIO_NCHANBUFS + 1);
1217 
1218 	err = usbd_set_alt_interface_index(sc->sc_udev,
1219 	    chan_alt->iface_index, chan_alt->iface_alt_index);
1220 	if (err) {
1221 		DPRINTF("setting of alternate index failed: %s!\n",
1222 		    usbd_errstr(err));
1223 		goto error;
1224 	}
1225 
1226 	/*
1227 	 * Only set the sample rate if the channel reports that it
1228 	 * supports the frequency control.
1229 	 */
1230 
1231 	if (sc->sc_audio_rev >= UAUDIO_VERSION_30) {
1232 		/* FALLTHROUGH */
1233 	} else if (sc->sc_audio_rev >= UAUDIO_VERSION_20) {
1234 		unsigned int x;
1235 
1236 		for (x = 0; x != 256; x++) {
1237 			if (dir == PCMDIR_PLAY) {
1238 				if (!(sc->sc_mixer_clocks.bit_output[x / 8] &
1239 				    (1 << (x % 8)))) {
1240 					continue;
1241 				}
1242 			} else {
1243 				if (!(sc->sc_mixer_clocks.bit_input[x / 8] &
1244 				    (1 << (x % 8)))) {
1245 					continue;
1246 				}
1247 			}
1248 
1249 			if (uaudio20_set_speed(sc->sc_udev,
1250 			    sc->sc_mixer_iface_no, x, chan_alt->sample_rate)) {
1251 				/*
1252 				 * If the endpoint is adaptive setting
1253 				 * the speed may fail.
1254 				 */
1255 				DPRINTF("setting of sample rate failed! "
1256 				    "(continuing anyway)\n");
1257 			}
1258 		}
1259 	} else if (chan_alt->p_sed.v1->bmAttributes & UA_SED_FREQ_CONTROL) {
1260 		if (uaudio_set_speed(sc->sc_udev,
1261 		    chan_alt->p_ed1->bEndpointAddress, chan_alt->sample_rate)) {
1262 			/*
1263 			 * If the endpoint is adaptive setting the
1264 			 * speed may fail.
1265 			 */
1266 			DPRINTF("setting of sample rate failed! "
1267 			    "(continuing anyway)\n");
1268 		}
1269 	}
1270 	if (usbd_transfer_setup(sc->sc_udev, &chan_alt->iface_index, chan->xfer,
1271 	    chan_alt->usb_cfg, UAUDIO_NCHANBUFS + 1, chan, chan->pcm_mtx)) {
1272 		DPRINTF("could not allocate USB transfers!\n");
1273 		goto error;
1274 	}
1275 
1276 	fps = usbd_get_isoc_fps(sc->sc_udev);
1277 
1278 	if (fps < 8000) {
1279 		/* FULL speed USB */
1280 		frames = 8;
1281 	} else {
1282 		/* HIGH speed USB */
1283 		frames = UAUDIO_NFRAMES;
1284 	}
1285 
1286 	fps_shift = usbd_xfer_get_fps_shift(chan->xfer[0]);
1287 
1288 	/* down shift number of frames per second, if any */
1289 	fps >>= fps_shift;
1290 	frames >>= fps_shift;
1291 
1292 	/* bytes per frame should not be zero */
1293 	chan->bytes_per_frame[0] =
1294 	    ((chan_alt->sample_rate / fps) * chan_alt->sample_size);
1295 	chan->bytes_per_frame[1] =
1296 	    (((chan_alt->sample_rate + fps - 1) / fps) * chan_alt->sample_size);
1297 
1298 	/* setup data rate dithering, if any */
1299 	chan->frames_per_second = fps;
1300 	chan->sample_rem = chan_alt->sample_rate % fps;
1301 	chan->sample_curr = 0;
1302 
1303 	/* compute required buffer size */
1304 	buf_size = (chan->bytes_per_frame[1] * frames);
1305 
1306 	if (buf_size > (chan->end - chan->start)) {
1307 		DPRINTF("buffer size is too big\n");
1308 		goto error;
1309 	}
1310 
1311 	chan->intr_frames = frames;
1312 
1313 	DPRINTF("fps=%d sample_rem=%d\n", (int)fps, (int)chan->sample_rem);
1314 
1315 	if (chan->intr_frames == 0) {
1316 		DPRINTF("frame shift is too high!\n");
1317 		goto error;
1318 	}
1319 
1320 	mtx_lock(chan->pcm_mtx);
1321 	chan->cur_alt = set_alt;
1322 	mtx_unlock(chan->pcm_mtx);
1323 
1324 done:
1325 #if (UAUDIO_NCHANBUFS != 2)
1326 #error "please update code"
1327 #endif
1328 	switch (operation) {
1329 	case CHAN_OP_START:
1330 		mtx_lock(chan->pcm_mtx);
1331 		usbd_transfer_start(chan->xfer[0]);
1332 		usbd_transfer_start(chan->xfer[1]);
1333 		mtx_unlock(chan->pcm_mtx);
1334 		break;
1335 	case CHAN_OP_STOP:
1336 		mtx_lock(chan->pcm_mtx);
1337 		usbd_transfer_stop(chan->xfer[0]);
1338 		usbd_transfer_stop(chan->xfer[1]);
1339 		mtx_unlock(chan->pcm_mtx);
1340 		break;
1341 	default:
1342 		break;
1343 	}
1344 	return;
1345 
1346 error:
1347 	usbd_transfer_unsetup(chan->xfer, UAUDIO_NCHANBUFS + 1);
1348 
1349 	mtx_lock(chan->pcm_mtx);
1350 	chan->cur_alt = CHAN_MAX_ALT;
1351 	mtx_unlock(chan->pcm_mtx);
1352 }
1353 
1354 static void
1355 uaudio_configure_msg(struct usb_proc_msg *pm)
1356 {
1357 	struct uaudio_softc *sc = ((struct uaudio_configure_msg *)pm)->sc;
1358 
1359 	usb_proc_explore_unlock(sc->sc_udev);
1360 	uaudio_configure_msg_sub(sc, &sc->sc_play_chan, PCMDIR_PLAY);
1361 	uaudio_configure_msg_sub(sc, &sc->sc_rec_chan, PCMDIR_REC);
1362 	usb_proc_explore_lock(sc->sc_udev);
1363 }
1364 
1365 /*========================================================================*
1366  * AS - Audio Stream - routines
1367  *========================================================================*/
1368 
1369 #ifdef USB_DEBUG
1370 static void
1371 uaudio_chan_dump_ep_desc(const usb_endpoint_descriptor_audio_t *ed)
1372 {
1373 	if (ed) {
1374 		DPRINTF("endpoint=%p bLength=%d bDescriptorType=%d \n"
1375 		    "bEndpointAddress=%d bmAttributes=0x%x \n"
1376 		    "wMaxPacketSize=%d bInterval=%d \n"
1377 		    "bRefresh=%d bSynchAddress=%d\n",
1378 		    ed, ed->bLength, ed->bDescriptorType,
1379 		    ed->bEndpointAddress, ed->bmAttributes,
1380 		    UGETW(ed->wMaxPacketSize), ed->bInterval,
1381 		    UEP_HAS_REFRESH(ed) ? ed->bRefresh : 0,
1382 		    UEP_HAS_SYNCADDR(ed) ? ed->bSynchAddress : 0);
1383 	}
1384 }
1385 
1386 #endif
1387 
1388 /*
1389  * The following is a workaround for broken no-name USB audio devices
1390  * sold by dealextreme called "3D sound". The problem is that the
1391  * manufacturer computed wMaxPacketSize is too small to hold the
1392  * actual data sent. In other words the device sometimes sends more
1393  * data than it actually reports it can send in a single isochronous
1394  * packet.
1395  */
1396 static void
1397 uaudio_record_fix_fs(usb_endpoint_descriptor_audio_t *ep,
1398     uint32_t xps, uint32_t add)
1399 {
1400 	uint32_t mps;
1401 
1402 	mps = UGETW(ep->wMaxPacketSize);
1403 
1404 	/*
1405 	 * If the device indicates it can send more data than what the
1406 	 * sample rate indicates, we apply the workaround.
1407 	 */
1408 	if (mps > xps) {
1409 
1410 		/* allow additional data */
1411 		xps += add;
1412 
1413 		/* check against the maximum USB 1.x length */
1414 		if (xps > 1023)
1415 			xps = 1023;
1416 
1417 		/* check if we should do an update */
1418 		if (mps < xps) {
1419 			/* simply update the wMaxPacketSize field */
1420 			USETW(ep->wMaxPacketSize, xps);
1421 			DPRINTF("Workaround: Updated wMaxPacketSize "
1422 			    "from %d to %d bytes.\n",
1423 			    (int)mps, (int)xps);
1424 		}
1425 	}
1426 }
1427 
1428 static usb_error_t
1429 uaudio20_check_rate(struct usb_device *udev, uint8_t iface_no,
1430     uint8_t clockid, uint32_t rate)
1431 {
1432 	struct usb_device_request req;
1433 	usb_error_t error;
1434 	uint8_t data[255];
1435 	uint16_t actlen;
1436 	uint16_t rates;
1437 	uint16_t x;
1438 
1439 	DPRINTFN(6, "ifaceno=%d clockid=%d rate=%u\n",
1440 	    iface_no, clockid, rate);
1441 
1442 	req.bmRequestType = UT_READ_CLASS_INTERFACE;
1443 	req.bRequest = UA20_CS_RANGE;
1444 	USETW2(req.wValue, UA20_CS_SAM_FREQ_CONTROL, 0);
1445 	USETW2(req.wIndex, clockid, iface_no);
1446 	USETW(req.wLength, 255);
1447 
1448         error = usbd_do_request_flags(udev, NULL, &req, data,
1449 	    USB_SHORT_XFER_OK, &actlen, USB_DEFAULT_TIMEOUT);
1450 
1451 	if (error != 0 || actlen < 2)
1452 		return (USB_ERR_INVAL);
1453 
1454 	rates = data[0] | (data[1] << 8);
1455 	actlen = (actlen - 2) / 12;
1456 
1457 	if (rates > actlen) {
1458 		DPRINTF("Too many rates\n");
1459 		rates = actlen;
1460 	}
1461 
1462 	for (x = 0; x != rates; x++) {
1463 		uint32_t min = UGETDW(data + 2 + (12 * x));
1464 		uint32_t max = UGETDW(data + 6 + (12 * x));
1465 		uint32_t res = UGETDW(data + 10 + (12 * x));
1466 
1467 		if (res == 0) {
1468 			DPRINTF("Zero residue\n");
1469 			res = 1;
1470 		}
1471 
1472 		if (min > max) {
1473 			DPRINTF("Swapped max and min\n");
1474 			uint32_t temp;
1475 			temp = min;
1476 			min = max;
1477 			max = temp;
1478 		}
1479 
1480 		if (rate >= min && rate <= max &&
1481 		    (((rate - min) % res) == 0)) {
1482 			return (0);
1483 		}
1484 	}
1485 	return (USB_ERR_INVAL);
1486 }
1487 
1488 static void
1489 uaudio_chan_fill_info_sub(struct uaudio_softc *sc, struct usb_device *udev,
1490     uint32_t rate, uint8_t channels, uint8_t bit_resolution)
1491 {
1492 	struct usb_descriptor *desc = NULL;
1493 	union uaudio_asid asid = { NULL };
1494 	union uaudio_asf1d asf1d = { NULL };
1495 	union uaudio_sed sed = { NULL };
1496 	struct usb_midi_streaming_endpoint_descriptor *msid = NULL;
1497 	usb_endpoint_descriptor_audio_t *ed1 = NULL;
1498 	const struct usb_audio_control_descriptor *acdp = NULL;
1499 	struct usb_config_descriptor *cd = usbd_get_config_descriptor(udev);
1500 	struct usb_interface_descriptor *id;
1501 	const struct uaudio_format *p_fmt = NULL;
1502 	struct uaudio_chan *chan;
1503 	struct uaudio_chan_alt *chan_alt;
1504 	uint32_t format;
1505 	uint16_t curidx = 0xFFFF;
1506 	uint16_t lastidx = 0xFFFF;
1507 	uint16_t alt_index = 0;
1508 	uint16_t audio_rev = 0;
1509 	uint16_t x;
1510 	uint8_t ep_dir;
1511 	uint8_t bChannels;
1512 	uint8_t bBitResolution;
1513 	uint8_t audio_if = 0;
1514 	uint8_t midi_if = 0;
1515 	uint8_t uma_if_class;
1516 
1517 	while ((desc = usb_desc_foreach(cd, desc))) {
1518 
1519 		if ((desc->bDescriptorType == UDESC_INTERFACE) &&
1520 		    (desc->bLength >= sizeof(*id))) {
1521 
1522 			id = (void *)desc;
1523 
1524 			if (id->bInterfaceNumber != lastidx) {
1525 				lastidx = id->bInterfaceNumber;
1526 				curidx++;
1527 				alt_index = 0;
1528 
1529 			} else {
1530 				alt_index++;
1531 			}
1532 
1533 			if ((!(sc->sc_hid.flags & UAUDIO_HID_VALID)) &&
1534 			    (id->bInterfaceClass == UICLASS_HID) &&
1535 			    (id->bInterfaceSubClass == 0) &&
1536 			    (id->bInterfaceProtocol == 0) &&
1537 			    (alt_index == 0) &&
1538 			    usbd_get_iface(udev, curidx) != NULL) {
1539 				DPRINTF("Found HID interface at %d\n",
1540 				    curidx);
1541 				sc->sc_hid.flags |= UAUDIO_HID_VALID;
1542 				sc->sc_hid.iface_index = curidx;
1543 			}
1544 
1545 			uma_if_class =
1546 			    ((id->bInterfaceClass == UICLASS_AUDIO) ||
1547 			    ((id->bInterfaceClass == UICLASS_VENDOR) &&
1548 			    (sc->sc_uq_au_vendor_class != 0)));
1549 
1550 			if ((uma_if_class != 0) &&
1551 			    (id->bInterfaceSubClass == UISUBCLASS_AUDIOSTREAM)) {
1552 				audio_if = 1;
1553 			} else {
1554 				audio_if = 0;
1555 			}
1556 
1557 			if ((uma_if_class != 0) &&
1558 			    (id->bInterfaceSubClass == UISUBCLASS_MIDISTREAM)) {
1559 
1560 				/*
1561 				 * XXX could allow multiple MIDI interfaces
1562 				 */
1563 				midi_if = 1;
1564 
1565 				if ((sc->sc_midi_chan.valid == 0) &&
1566 				    (usbd_get_iface(udev, curidx) != NULL)) {
1567 					sc->sc_midi_chan.iface_index = curidx;
1568 					sc->sc_midi_chan.iface_alt_index = alt_index;
1569 					sc->sc_midi_chan.valid = 1;
1570 				}
1571 			} else {
1572 				midi_if = 0;
1573 			}
1574 			asid.v1 = NULL;
1575 			asf1d.v1 = NULL;
1576 			ed1 = NULL;
1577 			sed.v1 = NULL;
1578 
1579 			/*
1580 			 * There can only be one USB audio instance
1581 			 * per USB device. Grab all USB audio
1582 			 * interfaces on this USB device so that we
1583 			 * don't attach USB audio twice:
1584 			 */
1585 			if (alt_index == 0 && curidx != sc->sc_mixer_iface_index &&
1586 			    (id->bInterfaceClass == UICLASS_AUDIO || audio_if != 0 ||
1587 			    midi_if != 0)) {
1588 				usbd_set_parent_iface(sc->sc_udev, curidx,
1589 				    sc->sc_mixer_iface_index);
1590 			}
1591 		}
1592 
1593 		if (audio_if == 0) {
1594 			if (midi_if == 0) {
1595 				if ((acdp == NULL) &&
1596 				    (desc->bDescriptorType == UDESC_CS_INTERFACE) &&
1597 				    (desc->bDescriptorSubtype == UDESCSUB_AC_HEADER) &&
1598 				    (desc->bLength >= sizeof(*acdp))) {
1599 					acdp = (void *)desc;
1600 					audio_rev = UGETW(acdp->bcdADC);
1601 				}
1602 			} else {
1603 				msid = (void *)desc;
1604 
1605 				/* get the maximum number of embedded jacks in use, if any */
1606 				if (msid->bLength >= sizeof(*msid) &&
1607 				    msid->bDescriptorType == UDESC_CS_ENDPOINT &&
1608 				    msid->bDescriptorSubtype == MS_GENERAL &&
1609 				    msid->bNumEmbMIDIJack > sc->sc_midi_chan.max_emb_jack) {
1610 					sc->sc_midi_chan.max_emb_jack = msid->bNumEmbMIDIJack;
1611 				}
1612 			}
1613 			/*
1614 			 * Don't collect any USB audio descriptors if
1615 			 * this is not an USB audio stream interface.
1616 			 */
1617 			continue;
1618 		}
1619 
1620 		if ((acdp != NULL) &&
1621 		    (desc->bDescriptorType == UDESC_CS_INTERFACE) &&
1622 		    (desc->bDescriptorSubtype == AS_GENERAL) &&
1623 		    (asid.v1 == NULL)) {
1624 			if (audio_rev >= UAUDIO_VERSION_30) {
1625 				/* FALLTHROUGH */
1626 			} else if (audio_rev >= UAUDIO_VERSION_20) {
1627 				if (desc->bLength >= sizeof(*asid.v2)) {
1628 					asid.v2 = (void *)desc;
1629 				}
1630 			} else {
1631 				if (desc->bLength >= sizeof(*asid.v1)) {
1632 					asid.v1 = (void *)desc;
1633 				}
1634 			}
1635 		}
1636 		if ((acdp != NULL) &&
1637 		    (desc->bDescriptorType == UDESC_CS_INTERFACE) &&
1638 		    (desc->bDescriptorSubtype == FORMAT_TYPE) &&
1639 		    (asf1d.v1 == NULL)) {
1640 			if (audio_rev >= UAUDIO_VERSION_30) {
1641 				/* FALLTHROUGH */
1642 			} else if (audio_rev >= UAUDIO_VERSION_20) {
1643 				if (desc->bLength >= sizeof(*asf1d.v2))
1644 					asf1d.v2 = (void *)desc;
1645 			} else {
1646 				if (desc->bLength >= sizeof(*asf1d.v1)) {
1647 					asf1d.v1 = (void *)desc;
1648 
1649 					if (asf1d.v1->bFormatType != FORMAT_TYPE_I) {
1650 						DPRINTFN(11, "ignored bFormatType = %d\n",
1651 						    asf1d.v1->bFormatType);
1652 						asf1d.v1 = NULL;
1653 						continue;
1654 					}
1655 					if (desc->bLength < (sizeof(*asf1d.v1) +
1656 					    ((asf1d.v1->bSamFreqType == 0) ? 6 :
1657 					    (asf1d.v1->bSamFreqType * 3)))) {
1658 						DPRINTFN(11, "invalid descriptor, "
1659 						    "too short\n");
1660 						asf1d.v1 = NULL;
1661 						continue;
1662 					}
1663 				}
1664 			}
1665 		}
1666 		if ((desc->bDescriptorType == UDESC_ENDPOINT) &&
1667 		    (desc->bLength >= UEP_MINSIZE) &&
1668 		    (ed1 == NULL)) {
1669 			ed1 = (void *)desc;
1670 			if (UE_GET_XFERTYPE(ed1->bmAttributes) != UE_ISOCHRONOUS) {
1671 				ed1 = NULL;
1672 				continue;
1673 			}
1674 		}
1675 		if ((acdp != NULL) &&
1676 		    (desc->bDescriptorType == UDESC_CS_ENDPOINT) &&
1677 		    (desc->bDescriptorSubtype == AS_GENERAL) &&
1678 		    (sed.v1 == NULL)) {
1679 			if (audio_rev >= UAUDIO_VERSION_30) {
1680 				/* FALLTHROUGH */
1681 			} else if (audio_rev >= UAUDIO_VERSION_20) {
1682 				if (desc->bLength >= sizeof(*sed.v2))
1683 					sed.v2 = (void *)desc;
1684 			} else {
1685 				if (desc->bLength >= sizeof(*sed.v1))
1686 					sed.v1 = (void *)desc;
1687 			}
1688 		}
1689 		if (asid.v1 == NULL || asf1d.v1 == NULL ||
1690 		    ed1 == NULL || sed.v1 == NULL) {
1691 			/* need more descriptors */
1692 			continue;
1693 		}
1694 
1695 		ep_dir = UE_GET_DIR(ed1->bEndpointAddress);
1696 
1697 		/* We ignore sync endpoint information until further. */
1698 
1699 		if (audio_rev >= UAUDIO_VERSION_30) {
1700 			goto next_ep;
1701 		} else if (audio_rev >= UAUDIO_VERSION_20) {
1702 
1703 			uint32_t dwFormat;
1704 
1705 			dwFormat = UGETDW(asid.v2->bmFormats);
1706 			bChannels = asid.v2->bNrChannels;
1707 			bBitResolution = asf1d.v2->bSubslotSize * 8;
1708 
1709 			if ((bChannels != channels) ||
1710 			    (bBitResolution != bit_resolution)) {
1711 				DPRINTF("Wrong number of channels\n");
1712 				goto next_ep;
1713 			}
1714 
1715 			for (p_fmt = uaudio20_formats;
1716 			    p_fmt->wFormat != 0; p_fmt++) {
1717 				if ((p_fmt->wFormat & dwFormat) &&
1718 				    (p_fmt->bPrecision == bBitResolution))
1719 					break;
1720 			}
1721 
1722 			if (p_fmt->wFormat == 0) {
1723 				DPRINTF("Unsupported audio format\n");
1724 				goto next_ep;
1725 			}
1726 
1727 			for (x = 0; x != 256; x++) {
1728 				if (ep_dir == UE_DIR_OUT) {
1729 					if (!(sc->sc_mixer_clocks.bit_output[x / 8] &
1730 					    (1 << (x % 8)))) {
1731 						continue;
1732 					}
1733 				} else {
1734 					if (!(sc->sc_mixer_clocks.bit_input[x / 8] &
1735 					    (1 << (x % 8)))) {
1736 						continue;
1737 					}
1738 				}
1739 
1740 				DPRINTF("Checking clock ID=%d\n", x);
1741 
1742 				if (uaudio20_check_rate(udev,
1743 				    sc->sc_mixer_iface_no, x, rate)) {
1744 					DPRINTF("Unsupported sampling "
1745 					    "rate, id=%d\n", x);
1746 					goto next_ep;
1747 				}
1748 			}
1749 		} else {
1750 			uint16_t wFormat;
1751 
1752 			wFormat = UGETW(asid.v1->wFormatTag);
1753 			bChannels = UAUDIO_MAX_CHAN(asf1d.v1->bNrChannels);
1754 			bBitResolution = asf1d.v1->bSubFrameSize * 8;
1755 
1756 			if (asf1d.v1->bSamFreqType == 0) {
1757 				DPRINTFN(16, "Sample rate: %d-%dHz\n",
1758 				    UA_SAMP_LO(asf1d.v1),
1759 				    UA_SAMP_HI(asf1d.v1));
1760 
1761 				if ((rate >= UA_SAMP_LO(asf1d.v1)) &&
1762 				    (rate <= UA_SAMP_HI(asf1d.v1)))
1763 					goto found_rate;
1764 			} else {
1765 
1766 				for (x = 0; x < asf1d.v1->bSamFreqType; x++) {
1767 					DPRINTFN(16, "Sample rate = %dHz\n",
1768 					    UA_GETSAMP(asf1d.v1, x));
1769 
1770 					if (rate == UA_GETSAMP(asf1d.v1, x))
1771 						goto found_rate;
1772 				}
1773 			}
1774 			goto next_ep;
1775 
1776 	found_rate:
1777 			for (p_fmt = uaudio10_formats;
1778 			    p_fmt->wFormat != 0; p_fmt++) {
1779 				if ((p_fmt->wFormat == wFormat) &&
1780 				    (p_fmt->bPrecision == bBitResolution))
1781 					break;
1782 			}
1783 			if (p_fmt->wFormat == 0) {
1784 				DPRINTF("Unsupported audio format\n");
1785 				goto next_ep;
1786 			}
1787 
1788 			if ((bChannels != channels) ||
1789 			    (bBitResolution != bit_resolution)) {
1790 				DPRINTF("Wrong number of channels\n");
1791 				goto next_ep;
1792 			}
1793 		}
1794 
1795 		chan = (ep_dir == UE_DIR_IN) ?
1796 		    &sc->sc_rec_chan : &sc->sc_play_chan;
1797 
1798 		if (usbd_get_iface(udev, curidx) == NULL) {
1799 			DPRINTF("Interface is not valid\n");
1800 			goto next_ep;
1801 		}
1802 		if (chan->num_alt == CHAN_MAX_ALT) {
1803 			DPRINTF("Too many alternate settings\n");
1804 			goto next_ep;
1805 		}
1806 		chan->set_alt = 0;
1807 		chan->cur_alt = CHAN_MAX_ALT;
1808 
1809 		chan_alt = &chan->usb_alt[chan->num_alt++];
1810 
1811 #ifdef USB_DEBUG
1812 		uaudio_chan_dump_ep_desc(ed1);
1813 #endif
1814 		DPRINTF("Sample rate = %dHz, channels = %d, "
1815 		    "bits = %d, format = %s\n", rate, channels,
1816 		    bit_resolution, p_fmt->description);
1817 
1818 		chan_alt->sample_rate = rate;
1819 		chan_alt->p_asf1d = asf1d;
1820 		chan_alt->p_ed1 = ed1;
1821 		chan_alt->p_fmt = p_fmt;
1822 		chan_alt->p_sed = sed;
1823 		chan_alt->iface_index = curidx;
1824 		chan_alt->iface_alt_index = alt_index;
1825 
1826 		if (ep_dir == UE_DIR_IN)
1827 			chan_alt->usb_cfg = uaudio_cfg_record;
1828 		else
1829 			chan_alt->usb_cfg = uaudio_cfg_play;
1830 
1831 		chan_alt->sample_size = (UAUDIO_MAX_CHAN(channels) *
1832 		    p_fmt->bPrecision) / 8;
1833 		chan_alt->channels = channels;
1834 
1835 		if (ep_dir == UE_DIR_IN &&
1836 		    usbd_get_speed(udev) == USB_SPEED_FULL) {
1837 			uaudio_record_fix_fs(ed1,
1838 			    chan_alt->sample_size * (rate / 1000),
1839 			    chan_alt->sample_size * (rate / 4000));
1840 		}
1841 
1842 		/* setup play/record format */
1843 
1844 		format = chan_alt->p_fmt->freebsd_fmt;
1845 
1846 		/* get default SND_FORMAT() */
1847 		format = SND_FORMAT(format, chan_alt->channels, 0);
1848 
1849 		switch (chan_alt->channels) {
1850 		uint32_t temp_fmt;
1851 		case 1:
1852 		case 2:
1853 			/* mono and stereo */
1854 			break;
1855 		default:
1856 			/* surround and more */
1857 			temp_fmt = feeder_matrix_default_format(format);
1858 			/* if multichannel, then format can be zero */
1859 			if (temp_fmt != 0)
1860 				format = temp_fmt;
1861 			break;
1862 		}
1863 
1864 		/* check if format is not supported */
1865 		if (format == 0) {
1866 			DPRINTF("The selected audio format is not supported\n");
1867 			chan->num_alt--;
1868 			goto next_ep;
1869 		}
1870 		if (chan->num_alt > 1) {
1871 			/* we only accumulate one format at different sample rates */
1872 			if (chan->pcm_format[0] != format) {
1873 				DPRINTF("Multiple formats is not supported\n");
1874 				chan->num_alt--;
1875 				goto next_ep;
1876 			}
1877 			/* ignore if duplicate sample rate entry */
1878 			if (rate == chan->usb_alt[chan->num_alt - 2].sample_rate) {
1879 				DPRINTF("Duplicate sample rate detected\n");
1880 				chan->num_alt--;
1881 				goto next_ep;
1882 			}
1883 		}
1884 		chan->pcm_cap.fmtlist = chan->pcm_format;
1885 		chan->pcm_cap.fmtlist[0] = format;
1886 
1887 		/* check if device needs bitperfect */
1888 		if (chan_alt->channels > UAUDIO_MATRIX_MAX)
1889 			sc->sc_pcm_bitperfect = 1;
1890 
1891 		if (rate < chan->pcm_cap.minspeed || chan->pcm_cap.minspeed == 0)
1892 			chan->pcm_cap.minspeed = rate;
1893 		if (rate > chan->pcm_cap.maxspeed || chan->pcm_cap.maxspeed == 0)
1894 			chan->pcm_cap.maxspeed = rate;
1895 
1896 		if (sc->sc_sndstat_valid != 0) {
1897 			sbuf_printf(&sc->sc_sndstat, "\n\t"
1898 			    "mode %d.%d:(%s) %dch, %dbit, %s, %dHz",
1899 			    curidx, alt_index,
1900 			    (ep_dir == UE_DIR_IN) ? "input" : "output",
1901 				    channels, p_fmt->bPrecision,
1902 				    p_fmt->description, rate);
1903 		}
1904 
1905 	next_ep:
1906 		sed.v1 = NULL;
1907 		ed1 = NULL;
1908 	}
1909 }
1910 
1911 /* This structure defines all the supported rates. */
1912 
1913 static const uint32_t uaudio_rate_list[CHAN_MAX_ALT] = {
1914 	384000,
1915 	352800,
1916 	192000,
1917 	176400,
1918 	96000,
1919 	88200,
1920 	88000,
1921 	80000,
1922 	72000,
1923 	64000,
1924 	56000,
1925 	48000,
1926 	44100,
1927 	40000,
1928 	32000,
1929 	24000,
1930 	22050,
1931 	16000,
1932 	11025,
1933 	8000,
1934 	0
1935 };
1936 
1937 static void
1938 uaudio_chan_fill_info(struct uaudio_softc *sc, struct usb_device *udev)
1939 {
1940 	uint32_t rate = uaudio_default_rate;
1941 	uint8_t z;
1942 	uint8_t bits = uaudio_default_bits;
1943 	uint8_t y;
1944 	uint8_t channels = uaudio_default_channels;
1945 	uint8_t x;
1946 
1947 	bits -= (bits % 8);
1948 	if ((bits == 0) || (bits > 32)) {
1949 		/* set a valid value */
1950 		bits = 32;
1951 	}
1952 	if (channels == 0) {
1953 		switch (usbd_get_speed(udev)) {
1954 		case USB_SPEED_LOW:
1955 		case USB_SPEED_FULL:
1956 			/*
1957 			 * Due to high bandwidth usage and problems
1958 			 * with HIGH-speed split transactions we
1959 			 * disable surround setups on FULL-speed USB
1960 			 * by default
1961 			 */
1962 			channels = 4;
1963 			break;
1964 		default:
1965 			channels = UAUDIO_CHANNELS_MAX;
1966 			break;
1967 		}
1968 	} else if (channels > UAUDIO_CHANNELS_MAX)
1969 		channels = UAUDIO_CHANNELS_MAX;
1970 
1971 	if (sbuf_new(&sc->sc_sndstat, NULL, 4096, SBUF_AUTOEXTEND))
1972 		sc->sc_sndstat_valid = 1;
1973 
1974 	/* try to search for a valid config */
1975 
1976 	for (x = channels; x; x--) {
1977 		for (y = bits; y; y -= 8) {
1978 
1979 			/* try user defined rate, if any */
1980 			if (rate != 0)
1981 				uaudio_chan_fill_info_sub(sc, udev, rate, x, y);
1982 
1983 			/* try find a matching rate, if any */
1984 			for (z = 0; uaudio_rate_list[z]; z++)
1985 				uaudio_chan_fill_info_sub(sc, udev, uaudio_rate_list[z], x, y);
1986 		}
1987 	}
1988 	if (sc->sc_sndstat_valid)
1989 		sbuf_finish(&sc->sc_sndstat);
1990 }
1991 
1992 static void
1993 uaudio_chan_play_sync_callback(struct usb_xfer *xfer, usb_error_t error)
1994 {
1995 	struct uaudio_chan *ch = usbd_xfer_softc(xfer);
1996 	struct usb_page_cache *pc;
1997 	uint64_t sample_rate;
1998 	uint8_t buf[4];
1999 	uint64_t temp;
2000 	int len;
2001 	int actlen;
2002 	int nframes;
2003 
2004 	usbd_xfer_status(xfer, &actlen, NULL, NULL, &nframes);
2005 
2006 	switch (USB_GET_STATE(xfer)) {
2007 	case USB_ST_TRANSFERRED:
2008 
2009 		DPRINTFN(6, "transferred %d bytes\n", actlen);
2010 
2011 		if (nframes == 0)
2012 			break;
2013 		len = usbd_xfer_frame_len(xfer, 0);
2014 		if (len == 0)
2015 			break;
2016 		if (len > sizeof(buf))
2017 			len = sizeof(buf);
2018 
2019 		memset(buf, 0, sizeof(buf));
2020 
2021 		pc = usbd_xfer_get_frame(xfer, 0);
2022 		usbd_copy_out(pc, 0, buf, len);
2023 
2024 		temp = UGETDW(buf);
2025 
2026 		DPRINTF("Value = 0x%08x\n", (int)temp);
2027 
2028 		/* auto-detect SYNC format */
2029 
2030 		if (len == 4)
2031 			temp &= 0x0fffffff;
2032 
2033 		/* check for no data */
2034 
2035 		if (temp == 0)
2036 			break;
2037 
2038 		temp *= 125ULL;
2039 
2040 		sample_rate = ch->usb_alt[ch->cur_alt].sample_rate;
2041 
2042 		/* auto adjust */
2043 		while (temp < (sample_rate - (sample_rate / 4)))
2044 			temp *= 2;
2045 
2046 		while (temp > (sample_rate + (sample_rate / 2)))
2047 			temp /= 2;
2048 
2049 		DPRINTF("Comparing %d Hz :: %d Hz\n",
2050 		    (int)temp, (int)sample_rate);
2051 
2052 		/*
2053 		 * Use feedback value as fallback when there is no
2054 		 * recording channel:
2055 		 */
2056 		if (ch->priv_sc->sc_rec_chan.num_alt == 0)
2057 			ch->jitter_curr = temp - sample_rate;
2058 
2059 		ch->feedback_rate = temp;
2060 		break;
2061 
2062 	case USB_ST_SETUP:
2063 		usbd_xfer_set_frames(xfer, 1);
2064 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_framelen(xfer));
2065 		usbd_transfer_submit(xfer);
2066 		break;
2067 
2068 	default:			/* Error */
2069 		break;
2070 	}
2071 }
2072 
2073 static int
2074 uaudio_chan_is_async(struct uaudio_chan *ch, uint8_t alt)
2075 {
2076 	uint8_t attr = ch->usb_alt[alt].p_ed1->bmAttributes;
2077 	return (UE_GET_ISO_TYPE(attr) == UE_ISO_ASYNC);
2078 }
2079 
2080 static void
2081 uaudio_chan_play_callback(struct usb_xfer *xfer, usb_error_t error)
2082 {
2083 	struct uaudio_chan *ch = usbd_xfer_softc(xfer);
2084 	struct uaudio_chan *ch_rec;
2085 	struct usb_page_cache *pc;
2086 	uint32_t mfl;
2087 	uint32_t total;
2088 	uint32_t blockcount;
2089 	uint32_t n;
2090 	uint32_t offset;
2091 	int sample_size;
2092 	int actlen;
2093 	int sumlen;
2094 
2095 	if (ch->running == 0 || ch->start == ch->end) {
2096 		DPRINTF("not running or no buffer!\n");
2097 		return;
2098 	}
2099 
2100 	/* check if there is a record channel */
2101 	if (ch->priv_sc->sc_rec_chan.num_alt > 0)
2102 		ch_rec = &ch->priv_sc->sc_rec_chan;
2103 	else
2104 		ch_rec = NULL;
2105 
2106 	usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL);
2107 
2108 	switch (USB_GET_STATE(xfer)) {
2109 	case USB_ST_SETUP:
2110 tr_setup:
2111 		if (ch_rec != NULL) {
2112 			/* reset receive jitter counters */
2113 			mtx_lock(ch_rec->pcm_mtx);
2114 			ch_rec->jitter_curr = 0;
2115 			ch_rec->jitter_rem = 0;
2116 			mtx_unlock(ch_rec->pcm_mtx);
2117 		}
2118 
2119 		/* reset transmit jitter counters */
2120 		ch->jitter_curr = 0;
2121 		ch->jitter_rem = 0;
2122 
2123 		/* FALLTHROUGH */
2124 	case USB_ST_TRANSFERRED:
2125 		if (actlen < sumlen) {
2126 			DPRINTF("short transfer, "
2127 			    "%d of %d bytes\n", actlen, sumlen);
2128 		}
2129 		chn_intr(ch->pcm_ch);
2130 
2131 		/*
2132 		 * Check for asynchronous playback endpoint and that
2133 		 * the playback endpoint is properly configured:
2134 		 */
2135 		if (ch_rec != NULL &&
2136 		    uaudio_chan_is_async(ch, ch->cur_alt) != 0) {
2137 			mtx_lock(ch_rec->pcm_mtx);
2138 			if (ch_rec->cur_alt < ch_rec->num_alt) {
2139 				int64_t tx_jitter;
2140 				int64_t rx_rate;
2141 
2142 				/* translate receive jitter into transmit jitter */
2143 				tx_jitter = ch->usb_alt[ch->cur_alt].sample_rate;
2144 				tx_jitter = (tx_jitter * ch_rec->jitter_curr) +
2145 				    ch->jitter_rem;
2146 
2147 				/* reset receive jitter counters */
2148 				ch_rec->jitter_curr = 0;
2149 				ch_rec->jitter_rem = 0;
2150 
2151 				/* compute exact number of transmit jitter samples */
2152 				rx_rate = ch_rec->usb_alt[ch_rec->cur_alt].sample_rate;
2153 				ch->jitter_curr += tx_jitter / rx_rate;
2154 				ch->jitter_rem = tx_jitter % rx_rate;
2155 			}
2156 			mtx_unlock(ch_rec->pcm_mtx);
2157 		}
2158 
2159 		/* start the SYNC transfer one time per second, if any */
2160 		if (++(ch->intr_counter) >= UAUDIO_IRQS) {
2161 			ch->intr_counter = 0;
2162 			usbd_transfer_start(ch->xfer[UAUDIO_NCHANBUFS]);
2163 		}
2164 
2165 		mfl = usbd_xfer_max_framelen(xfer);
2166 
2167 		if (ch->bytes_per_frame[1] > mfl) {
2168 			DPRINTF("bytes per transfer, %d, "
2169 			    "exceeds maximum, %d!\n",
2170 			    ch->bytes_per_frame[1],
2171 			    mfl);
2172 			break;
2173 		}
2174 
2175 		blockcount = ch->intr_frames;
2176 
2177 		/* setup number of frames */
2178 		usbd_xfer_set_frames(xfer, blockcount);
2179 
2180 		/* get sample size */
2181 		sample_size = ch->usb_alt[ch->cur_alt].sample_size;
2182 
2183 		/* reset total length */
2184 		total = 0;
2185 
2186 		/* setup frame lengths */
2187 		for (n = 0; n != blockcount; n++) {
2188 			uint32_t frame_len;
2189 
2190 			ch->sample_curr += ch->sample_rem;
2191 			if (ch->sample_curr >= ch->frames_per_second) {
2192 				ch->sample_curr -= ch->frames_per_second;
2193 				frame_len = ch->bytes_per_frame[1];
2194 			} else {
2195 				frame_len = ch->bytes_per_frame[0];
2196 			}
2197 
2198 			/* handle free running clock case */
2199 			if (ch->jitter_curr > 0 &&
2200 			    (frame_len + sample_size) <= mfl) {
2201 				DPRINTFN(6, "sending one sample more\n");
2202 				ch->jitter_curr--;
2203 				frame_len += sample_size;
2204 			} else if (ch->jitter_curr < 0 &&
2205 			    frame_len >= sample_size) {
2206 				DPRINTFN(6, "sending one sample less\n");
2207 				ch->jitter_curr++;
2208 				frame_len -= sample_size;
2209 			}
2210 			usbd_xfer_set_frame_len(xfer, n, frame_len);
2211 			total += frame_len;
2212 		}
2213 
2214 		DPRINTFN(6, "transferring %d bytes\n", total);
2215 
2216 		offset = 0;
2217 
2218 		pc = usbd_xfer_get_frame(xfer, 0);
2219 		while (total > 0) {
2220 
2221 			n = (ch->end - ch->cur);
2222 			if (n > total)
2223 				n = total;
2224 
2225 			usbd_copy_in(pc, offset, ch->cur, n);
2226 
2227 			total -= n;
2228 			ch->cur += n;
2229 			offset += n;
2230 
2231 			if (ch->cur >= ch->end)
2232 				ch->cur = ch->start;
2233 		}
2234 		usbd_transfer_submit(xfer);
2235 		break;
2236 
2237 	default:			/* Error */
2238 		if (error != USB_ERR_CANCELLED)
2239 			goto tr_setup;
2240 		break;
2241 	}
2242 }
2243 
2244 static void
2245 uaudio_chan_record_sync_callback(struct usb_xfer *xfer, usb_error_t error)
2246 {
2247 	/* TODO */
2248 }
2249 
2250 static void
2251 uaudio_chan_record_callback(struct usb_xfer *xfer, usb_error_t error)
2252 {
2253 	struct uaudio_chan *ch = usbd_xfer_softc(xfer);
2254 	struct usb_page_cache *pc;
2255 	uint32_t offset0;
2256 	uint32_t mfl;
2257 	int m;
2258 	int n;
2259 	int len;
2260 	int actlen;
2261 	int nframes;
2262 	int expected_bytes;
2263 	int sample_size;
2264 
2265 	if (ch->start == ch->end) {
2266 		DPRINTF("no buffer!\n");
2267 		return;
2268 	}
2269 
2270 	usbd_xfer_status(xfer, &actlen, NULL, NULL, &nframes);
2271 	mfl = usbd_xfer_max_framelen(xfer);
2272 
2273 	switch (USB_GET_STATE(xfer)) {
2274 	case USB_ST_TRANSFERRED:
2275 
2276 		offset0 = 0;
2277 		pc = usbd_xfer_get_frame(xfer, 0);
2278 
2279 		/* try to compute the number of expected bytes */
2280 		ch->sample_curr += (ch->sample_rem * ch->intr_frames);
2281 
2282 		/* compute number of expected bytes */
2283 		expected_bytes = (ch->intr_frames * ch->bytes_per_frame[0]) +
2284 		    ((ch->sample_curr / ch->frames_per_second) *
2285 		    (ch->bytes_per_frame[1] - ch->bytes_per_frame[0]));
2286 
2287 		/* keep remainder */
2288 		ch->sample_curr %= ch->frames_per_second;
2289 
2290 		/* get current sample size */
2291 		sample_size = ch->usb_alt[ch->cur_alt].sample_size;
2292 
2293 		for (n = 0; n != nframes; n++) {
2294 			uint32_t offset1 = offset0;
2295 
2296 			len = usbd_xfer_frame_len(xfer, n);
2297 
2298 			/* make sure we only receive complete samples */
2299 			len = len - (len % sample_size);
2300 
2301 			/* subtract bytes received from expected payload */
2302 			expected_bytes -= len;
2303 
2304 			/* don't receive data when not ready */
2305 			if (ch->running == 0 || ch->cur_alt != ch->set_alt)
2306 				continue;
2307 
2308 			/* fill ring buffer with samples, if any */
2309 			while (len > 0) {
2310 
2311 				m = (ch->end - ch->cur);
2312 
2313 				if (m > len)
2314 					m = len;
2315 
2316 				usbd_copy_out(pc, offset1, ch->cur, m);
2317 
2318 				len -= m;
2319 				offset1 += m;
2320 				ch->cur += m;
2321 
2322 				if (ch->cur >= ch->end)
2323 					ch->cur = ch->start;
2324 			}
2325 
2326 			offset0 += mfl;
2327 		}
2328 
2329 		/* update current jitter */
2330 		ch->jitter_curr -= (expected_bytes / sample_size);
2331 
2332 		/* don't allow a huge amount of jitter to accumulate */
2333 		nframes = 2 * ch->intr_frames;
2334 
2335 		/* range check current jitter */
2336 		if (ch->jitter_curr < -nframes)
2337 			ch->jitter_curr = -nframes;
2338 		else if (ch->jitter_curr > nframes)
2339 			ch->jitter_curr = nframes;
2340 
2341 		DPRINTFN(6, "transferred %d bytes, jitter %d samples\n",
2342 		    actlen, ch->jitter_curr);
2343 
2344 		if (ch->running != 0)
2345 			chn_intr(ch->pcm_ch);
2346 
2347 	case USB_ST_SETUP:
2348 tr_setup:
2349 		nframes = ch->intr_frames;
2350 
2351 		usbd_xfer_set_frames(xfer, nframes);
2352 		for (n = 0; n != nframes; n++)
2353 			usbd_xfer_set_frame_len(xfer, n, mfl);
2354 
2355 		usbd_transfer_submit(xfer);
2356 		break;
2357 
2358 	default:			/* Error */
2359 		if (error != USB_ERR_CANCELLED)
2360 			goto tr_setup;
2361 		break;
2362 	}
2363 }
2364 
2365 void   *
2366 uaudio_chan_init(struct uaudio_softc *sc, struct snd_dbuf *b,
2367     struct pcm_channel *c, int dir)
2368 {
2369 	struct uaudio_chan *ch = ((dir == PCMDIR_PLAY) ?
2370 	    &sc->sc_play_chan : &sc->sc_rec_chan);
2371 	uint32_t buf_size;
2372 	uint8_t x;
2373 
2374 	/* store mutex and PCM channel */
2375 
2376 	ch->pcm_ch = c;
2377 	ch->pcm_mtx = c->lock;
2378 
2379 	/* compute worst case buffer */
2380 
2381 	buf_size = 0;
2382 	for (x = 0; x != ch->num_alt; x++) {
2383 		uint32_t temp = uaudio_get_buffer_size(ch, x);
2384 		if (temp > buf_size)
2385 			buf_size = temp;
2386 	}
2387 
2388 	/* allow double buffering */
2389 	buf_size *= 2;
2390 
2391 	DPRINTF("Worst case buffer is %d bytes\n", (int)buf_size);
2392 
2393 	ch->buf = malloc(buf_size, M_DEVBUF, M_WAITOK | M_ZERO);
2394 	if (ch->buf == NULL)
2395 		goto error;
2396 	if (sndbuf_setup(b, ch->buf, buf_size) != 0)
2397 		goto error;
2398 
2399 	ch->start = ch->buf;
2400 	ch->end = ch->buf + buf_size;
2401 	ch->cur = ch->buf;
2402 	ch->pcm_buf = b;
2403 	ch->max_buf = buf_size;
2404 
2405 	if (ch->pcm_mtx == NULL) {
2406 		DPRINTF("ERROR: PCM channels does not have a mutex!\n");
2407 		goto error;
2408 	}
2409 	return (ch);
2410 
2411 error:
2412 	uaudio_chan_free(ch);
2413 	return (NULL);
2414 }
2415 
2416 int
2417 uaudio_chan_free(struct uaudio_chan *ch)
2418 {
2419 	if (ch->buf != NULL) {
2420 		free(ch->buf, M_DEVBUF);
2421 		ch->buf = NULL;
2422 	}
2423 	usbd_transfer_unsetup(ch->xfer, UAUDIO_NCHANBUFS + 1);
2424 
2425 	ch->num_alt = 0;
2426 
2427 	return (0);
2428 }
2429 
2430 int
2431 uaudio_chan_set_param_blocksize(struct uaudio_chan *ch, uint32_t blocksize)
2432 {
2433 	uint32_t temp = 2 * uaudio_get_buffer_size(ch, ch->set_alt);
2434 	sndbuf_setup(ch->pcm_buf, ch->buf, temp);
2435 	return (temp / 2);
2436 }
2437 
2438 int
2439 uaudio_chan_set_param_fragments(struct uaudio_chan *ch, uint32_t blocksize,
2440     uint32_t blockcount)
2441 {
2442 	return (1);
2443 }
2444 
2445 int
2446 uaudio_chan_set_param_speed(struct uaudio_chan *ch, uint32_t speed)
2447 {
2448 	struct uaudio_softc *sc;
2449 	uint8_t x;
2450 
2451 	sc = ch->priv_sc;
2452 
2453 	for (x = 0; x < ch->num_alt; x++) {
2454 		if (ch->usb_alt[x].sample_rate < speed) {
2455 			/* sample rate is too low */
2456 			break;
2457 		}
2458 	}
2459 
2460 	if (x != 0)
2461 		x--;
2462 
2463 	usb_proc_explore_lock(sc->sc_udev);
2464 	ch->set_alt = x;
2465 	usb_proc_explore_unlock(sc->sc_udev);
2466 
2467 	DPRINTF("Selecting alt %d\n", (int)x);
2468 
2469 	return (ch->usb_alt[x].sample_rate);
2470 }
2471 
2472 int
2473 uaudio_chan_getptr(struct uaudio_chan *ch)
2474 {
2475 	return (ch->cur - ch->start);
2476 }
2477 
2478 struct pcmchan_caps *
2479 uaudio_chan_getcaps(struct uaudio_chan *ch)
2480 {
2481 	return (&ch->pcm_cap);
2482 }
2483 
2484 static struct pcmchan_matrix uaudio_chan_matrix_swap_2_0 = {
2485 	.id = SND_CHN_MATRIX_DRV,
2486 	.channels = 2,
2487 	.ext = 0,
2488 	.map = {
2489 		/* Right */
2490 		[0] = {
2491 			.type = SND_CHN_T_FR,
2492 			.members =
2493 			    SND_CHN_T_MASK_FR | SND_CHN_T_MASK_FC |
2494 			    SND_CHN_T_MASK_LF | SND_CHN_T_MASK_BR |
2495 			    SND_CHN_T_MASK_BC | SND_CHN_T_MASK_SR
2496 		},
2497 		/* Left */
2498 		[1] = {
2499 			.type = SND_CHN_T_FL,
2500 			.members =
2501 			    SND_CHN_T_MASK_FL | SND_CHN_T_MASK_FC |
2502 			    SND_CHN_T_MASK_LF | SND_CHN_T_MASK_BL |
2503 			    SND_CHN_T_MASK_BC | SND_CHN_T_MASK_SL
2504 		},
2505 		[2] = {
2506 			.type = SND_CHN_T_MAX,
2507 			.members = 0
2508 		}
2509 	},
2510 	.mask = SND_CHN_T_MASK_FR | SND_CHN_T_MASK_FL,
2511 	.offset = {  1,  0, -1, -1, -1, -1, -1, -1, -1,
2512 		    -1, -1, -1, -1, -1, -1, -1, -1, -1  }
2513 };
2514 
2515 struct pcmchan_matrix *
2516 uaudio_chan_getmatrix(struct uaudio_chan *ch, uint32_t format)
2517 {
2518 	struct uaudio_softc *sc;
2519 
2520 	sc = ch->priv_sc;
2521 
2522 	if (sc != NULL && sc->sc_uq_audio_swap_lr != 0 &&
2523 	    AFMT_CHANNEL(format) == 2)
2524 		return (&uaudio_chan_matrix_swap_2_0);
2525 
2526 	return (feeder_matrix_format_map(format));
2527 }
2528 
2529 int
2530 uaudio_chan_set_param_format(struct uaudio_chan *ch, uint32_t format)
2531 {
2532 	DPRINTF("Selecting format 0x%08x\n", (unsigned int)format);
2533 	return (0);
2534 }
2535 
2536 static void
2537 uaudio_chan_start_sub(struct uaudio_chan *ch)
2538 {
2539 	struct uaudio_softc *sc = ch->priv_sc;
2540 	int do_start = 0;
2541 
2542 	if (ch->operation != CHAN_OP_DRAIN) {
2543 		if (ch->cur_alt == ch->set_alt &&
2544 		    ch->operation == CHAN_OP_NONE &&
2545 		    mtx_owned(ch->pcm_mtx) != 0) {
2546 			/* save doing the explore task */
2547 			do_start = 1;
2548 		} else {
2549 			ch->operation = CHAN_OP_START;
2550 			(void)usb_proc_explore_msignal(sc->sc_udev,
2551 			    &sc->sc_config_msg[0], &sc->sc_config_msg[1]);
2552 		}
2553 	}
2554 	if (do_start) {
2555 		usbd_transfer_start(ch->xfer[0]);
2556 		usbd_transfer_start(ch->xfer[1]);
2557 	}
2558 }
2559 
2560 static int
2561 uaudio_chan_need_both(struct uaudio_softc *sc)
2562 {
2563 	return (sc->sc_play_chan.num_alt > 0 &&
2564 	    sc->sc_play_chan.running != 0 &&
2565 	    uaudio_chan_is_async(&sc->sc_play_chan,
2566 	    sc->sc_play_chan.set_alt) != 0 &&
2567 	    sc->sc_rec_chan.num_alt > 0 &&
2568 	    sc->sc_rec_chan.running == 0);
2569 }
2570 
2571 static int
2572 uaudio_chan_need_none(struct uaudio_softc *sc)
2573 {
2574 	return (sc->sc_play_chan.num_alt > 0 &&
2575 	    sc->sc_play_chan.running == 0 &&
2576 	    sc->sc_rec_chan.num_alt > 0 &&
2577 	    sc->sc_rec_chan.running == 0);
2578 }
2579 
2580 void
2581 uaudio_chan_start(struct uaudio_chan *ch)
2582 {
2583 	struct uaudio_softc *sc = ch->priv_sc;
2584 
2585 	/* make operation atomic */
2586 	usb_proc_explore_lock(sc->sc_udev);
2587 
2588 	/* check if not running */
2589 	if (ch->running == 0) {
2590 	  	uint32_t temp;
2591 
2592 		/* get current buffer size */
2593 		temp = 2 * uaudio_get_buffer_size(ch, ch->set_alt);
2594 
2595 		/* set running flag */
2596 		ch->running = 1;
2597 
2598 		/* ensure the hardware buffer is reset */
2599 		ch->start = ch->buf;
2600 		ch->end = ch->buf + temp;
2601 		ch->cur = ch->buf;
2602 
2603 		if (uaudio_chan_need_both(sc)) {
2604 			/*
2605 			 * Start both endpoints because of need for
2606 			 * jitter information:
2607 			 */
2608 			uaudio_chan_start_sub(&sc->sc_rec_chan);
2609 			uaudio_chan_start_sub(&sc->sc_play_chan);
2610 		} else {
2611 			uaudio_chan_start_sub(ch);
2612 		}
2613 	}
2614 
2615 	/* exit atomic operation */
2616 	usb_proc_explore_unlock(sc->sc_udev);
2617 }
2618 
2619 static void
2620 uaudio_chan_stop_sub(struct uaudio_chan *ch)
2621 {
2622 	struct uaudio_softc *sc = ch->priv_sc;
2623 	int do_stop = 0;
2624 
2625 	if (ch->operation != CHAN_OP_DRAIN) {
2626 		if (ch->cur_alt == ch->set_alt &&
2627 		    ch->operation == CHAN_OP_NONE &&
2628 		    mtx_owned(ch->pcm_mtx) != 0) {
2629 			/* save doing the explore task */
2630 			do_stop = 1;
2631 		} else {
2632 			ch->operation = CHAN_OP_STOP;
2633 			(void)usb_proc_explore_msignal(sc->sc_udev,
2634 			    &sc->sc_config_msg[0], &sc->sc_config_msg[1]);
2635 		}
2636 	}
2637 	if (do_stop) {
2638 		usbd_transfer_stop(ch->xfer[0]);
2639 		usbd_transfer_stop(ch->xfer[1]);
2640 	}
2641 }
2642 
2643 void
2644 uaudio_chan_stop(struct uaudio_chan *ch)
2645 {
2646 	struct uaudio_softc *sc = ch->priv_sc;
2647 
2648 	/* make operation atomic */
2649 	usb_proc_explore_lock(sc->sc_udev);
2650 
2651 	/* check if running */
2652 	if (ch->running != 0) {
2653 		/* clear running flag */
2654 		ch->running = 0;
2655 
2656 		if (uaudio_chan_need_both(sc)) {
2657 			/*
2658 			 * Leave the endpoints running because we need
2659 			 * information about jitter!
2660 			 */
2661 		} else if (uaudio_chan_need_none(sc)) {
2662 			/*
2663 			 * Stop both endpoints in case the one was used for
2664 			 * jitter information:
2665 			 */
2666 			uaudio_chan_stop_sub(&sc->sc_rec_chan);
2667 			uaudio_chan_stop_sub(&sc->sc_play_chan);
2668 		} else {
2669 			uaudio_chan_stop_sub(ch);
2670 		}
2671 	}
2672 
2673 	/* exit atomic operation */
2674 	usb_proc_explore_unlock(sc->sc_udev);
2675 }
2676 
2677 /*========================================================================*
2678  * AC - Audio Controller - routines
2679  *========================================================================*/
2680 
2681 static int
2682 uaudio_mixer_sysctl_handler(SYSCTL_HANDLER_ARGS)
2683 {
2684 	struct uaudio_softc *sc;
2685 	struct uaudio_mixer_node *pmc;
2686 	int hint;
2687 	int error;
2688 	int temp = 0;
2689 	int chan = 0;
2690 
2691 	sc = (struct uaudio_softc *)oidp->oid_arg1;
2692 	hint = oidp->oid_arg2;
2693 
2694 	if (sc->sc_mixer_lock == NULL)
2695 		return (ENXIO);
2696 
2697 	/* lookup mixer node */
2698 
2699 	mtx_lock(sc->sc_mixer_lock);
2700 	for (pmc = sc->sc_mixer_root; pmc != NULL; pmc = pmc->next) {
2701 		for (chan = 0; chan != (int)pmc->nchan; chan++) {
2702 			if (pmc->wValue[chan] != -1 &&
2703 			    pmc->wValue[chan] == hint) {
2704 				temp = pmc->wData[chan];
2705 				goto found;
2706 			}
2707 		}
2708 	}
2709 found:
2710 	mtx_unlock(sc->sc_mixer_lock);
2711 
2712 	error = sysctl_handle_int(oidp, &temp, 0, req);
2713 	if (error != 0 || req->newptr == NULL)
2714 		return (error);
2715 
2716 	/* update mixer value */
2717 
2718 	mtx_lock(sc->sc_mixer_lock);
2719 	if (pmc != NULL &&
2720 	    temp >= pmc->minval &&
2721 	    temp <= pmc->maxval) {
2722 
2723 		pmc->wData[chan] = temp;
2724 		pmc->update[(chan / 8)] |= (1 << (chan % 8));
2725 
2726 		/* start the transfer, if not already started */
2727 		usbd_transfer_start(sc->sc_mixer_xfer[0]);
2728 	}
2729 	mtx_unlock(sc->sc_mixer_lock);
2730 
2731 	return (0);
2732 }
2733 
2734 static void
2735 uaudio_mixer_ctl_free(struct uaudio_softc *sc)
2736 {
2737 	struct uaudio_mixer_node *p_mc;
2738 
2739 	while ((p_mc = sc->sc_mixer_root) != NULL) {
2740 		sc->sc_mixer_root = p_mc->next;
2741 		free(p_mc, M_USBDEV);
2742 	}
2743 }
2744 
2745 static void
2746 uaudio_mixer_register_sysctl(struct uaudio_softc *sc, device_t dev)
2747 {
2748 	struct uaudio_mixer_node *pmc;
2749 	struct sysctl_oid *mixer_tree;
2750 	struct sysctl_oid *control_tree;
2751 	char buf[32];
2752 	int chan;
2753 	int n;
2754 
2755 	mixer_tree = SYSCTL_ADD_NODE(device_get_sysctl_ctx(dev),
2756 	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "mixer",
2757 	    CTLFLAG_RD, NULL, "");
2758 
2759 	if (mixer_tree == NULL)
2760 		return;
2761 
2762 	for (n = 0, pmc = sc->sc_mixer_root; pmc != NULL;
2763 	    pmc = pmc->next, n++) {
2764 
2765 		for (chan = 0; chan < pmc->nchan; chan++) {
2766 
2767 			if (pmc->nchan > 1) {
2768 				snprintf(buf, sizeof(buf), "%s_%d_%d",
2769 				    pmc->name, n, chan);
2770 			} else {
2771 				snprintf(buf, sizeof(buf), "%s_%d",
2772 				    pmc->name, n);
2773 			}
2774 
2775 			control_tree = SYSCTL_ADD_NODE(device_get_sysctl_ctx(dev),
2776 			    SYSCTL_CHILDREN(mixer_tree), OID_AUTO, buf,
2777 			    CTLFLAG_RD, NULL, "Mixer control nodes");
2778 
2779 			if (control_tree == NULL)
2780 				continue;
2781 
2782 			SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
2783 			    SYSCTL_CHILDREN(control_tree),
2784 			    OID_AUTO, "val", CTLTYPE_INT | CTLFLAG_RWTUN, sc,
2785 			    pmc->wValue[chan],
2786 			    uaudio_mixer_sysctl_handler, "I", "Current value");
2787 
2788 			SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
2789 			    SYSCTL_CHILDREN(control_tree),
2790 			    OID_AUTO, "min", CTLFLAG_RD, 0, pmc->minval,
2791 			    "Minimum value");
2792 
2793 			SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
2794 			    SYSCTL_CHILDREN(control_tree),
2795 			    OID_AUTO, "max", CTLFLAG_RD, 0, pmc->maxval,
2796 			    "Maximum value");
2797 
2798 			SYSCTL_ADD_STRING(device_get_sysctl_ctx(dev),
2799 			    SYSCTL_CHILDREN(control_tree),
2800 			    OID_AUTO, "desc", CTLFLAG_RD, pmc->desc, 0,
2801 			    "Description");
2802 		}
2803 	}
2804 }
2805 
2806 /* M-Audio FastTrack Ultra Mixer Description */
2807 /* Origin: Linux USB Audio driver */
2808 static void
2809 uaudio_mixer_controls_create_ftu(struct uaudio_softc *sc)
2810 {
2811 	int chx;
2812 	int chy;
2813 
2814 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2815 	MIX(sc).wIndex = MAKE_WORD(6, sc->sc_mixer_iface_no);
2816 	MIX(sc).wValue[0] = MAKE_WORD(8, 0);
2817 	MIX(sc).class = UAC_OUTPUT;
2818 	MIX(sc).type = MIX_UNSIGNED_16;
2819 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2820 	MIX(sc).name = "effect";
2821 	MIX(sc).minval = 0;
2822 	MIX(sc).maxval = 7;
2823 	MIX(sc).mul = 7;
2824 	MIX(sc).nchan = 1;
2825 	MIX(sc).update[0] = 1;
2826 	strlcpy(MIX(sc).desc, "Room1,2,3,Hall1,2,Plate,Delay,Echo", sizeof(MIX(sc).desc));
2827 	uaudio_mixer_add_ctl_sub(sc, &MIX(sc));
2828 
2829 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2830 	MIX(sc).wIndex = MAKE_WORD(5, sc->sc_mixer_iface_no);
2831 
2832 	for (chx = 0; chx != 8; chx++) {
2833 		for (chy = 0; chy != 8; chy++) {
2834 
2835 			MIX(sc).wValue[0] = MAKE_WORD(chx + 1, chy + 1);
2836 			MIX(sc).type = MIX_SIGNED_16;
2837 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2838 			MIX(sc).name = "mix_rec";
2839 			MIX(sc).nchan = 1;
2840 			MIX(sc).update[0] = 1;
2841 			MIX(sc).val_default = 0;
2842 			snprintf(MIX(sc).desc, sizeof(MIX(sc).desc),
2843 			    "AIn%d - Out%d Record Volume", chy + 1, chx + 1);
2844 
2845 			uaudio_mixer_add_ctl(sc, &MIX(sc));
2846 
2847 			MIX(sc).wValue[0] = MAKE_WORD(chx + 1, chy + 1 + 8);
2848 			MIX(sc).type = MIX_SIGNED_16;
2849 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2850 			MIX(sc).name = "mix_play";
2851 			MIX(sc).nchan = 1;
2852 			MIX(sc).update[0] = 1;
2853 			MIX(sc).val_default = (chx == chy) ? 2 : 0;
2854 			snprintf(MIX(sc).desc, sizeof(MIX(sc).desc),
2855 			    "DIn%d - Out%d Playback Volume", chy + 1, chx + 1);
2856 
2857 			uaudio_mixer_add_ctl(sc, &MIX(sc));
2858 		}
2859 	}
2860 
2861 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2862 	MIX(sc).wIndex = MAKE_WORD(6, sc->sc_mixer_iface_no);
2863 	MIX(sc).wValue[0] = MAKE_WORD(2, 0);
2864 	MIX(sc).class = UAC_OUTPUT;
2865 	MIX(sc).type = MIX_SIGNED_8;
2866 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2867 	MIX(sc).name = "effect_vol";
2868 	MIX(sc).nchan = 1;
2869 	MIX(sc).update[0] = 1;
2870 	MIX(sc).minval = 0;
2871 	MIX(sc).maxval = 0x7f;
2872 	MIX(sc).mul = 0x7f;
2873 	MIX(sc).nchan = 1;
2874 	MIX(sc).update[0] = 1;
2875 	strlcpy(MIX(sc).desc, "Effect Volume", sizeof(MIX(sc).desc));
2876 	uaudio_mixer_add_ctl_sub(sc, &MIX(sc));
2877 
2878 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2879 	MIX(sc).wIndex = MAKE_WORD(6, sc->sc_mixer_iface_no);
2880 	MIX(sc).wValue[0] = MAKE_WORD(3, 0);
2881 	MIX(sc).class = UAC_OUTPUT;
2882 	MIX(sc).type = MIX_SIGNED_16;
2883 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2884 	MIX(sc).name = "effect_dur";
2885 	MIX(sc).nchan = 1;
2886 	MIX(sc).update[0] = 1;
2887 	MIX(sc).minval = 0;
2888 	MIX(sc).maxval = 0x7f00;
2889 	MIX(sc).mul = 0x7f00;
2890 	MIX(sc).nchan = 1;
2891 	MIX(sc).update[0] = 1;
2892 	strlcpy(MIX(sc).desc, "Effect Duration", sizeof(MIX(sc).desc));
2893 	uaudio_mixer_add_ctl_sub(sc, &MIX(sc));
2894 
2895 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2896 	MIX(sc).wIndex = MAKE_WORD(6, sc->sc_mixer_iface_no);
2897 	MIX(sc).wValue[0] = MAKE_WORD(4, 0);
2898 	MIX(sc).class = UAC_OUTPUT;
2899 	MIX(sc).type = MIX_SIGNED_8;
2900 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2901 	MIX(sc).name = "effect_fb";
2902 	MIX(sc).nchan = 1;
2903 	MIX(sc).update[0] = 1;
2904 	MIX(sc).minval = 0;
2905 	MIX(sc).maxval = 0x7f;
2906 	MIX(sc).mul = 0x7f;
2907 	MIX(sc).nchan = 1;
2908 	MIX(sc).update[0] = 1;
2909 	strlcpy(MIX(sc).desc, "Effect Feedback Volume", sizeof(MIX(sc).desc));
2910 	uaudio_mixer_add_ctl_sub(sc, &MIX(sc));
2911 
2912 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2913 	MIX(sc).wIndex = MAKE_WORD(7, sc->sc_mixer_iface_no);
2914 	for (chy = 0; chy != 4; chy++) {
2915 
2916 		MIX(sc).wValue[0] = MAKE_WORD(7, chy + 1);
2917 		MIX(sc).type = MIX_SIGNED_16;
2918 		MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2919 		MIX(sc).name = "effect_ret";
2920 		MIX(sc).nchan = 1;
2921 		MIX(sc).update[0] = 1;
2922 		snprintf(MIX(sc).desc, sizeof(MIX(sc).desc),
2923 		    "Effect Return %d Volume", chy + 1);
2924 
2925 		uaudio_mixer_add_ctl(sc, &MIX(sc));
2926 	}
2927 
2928 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
2929 	MIX(sc).wIndex = MAKE_WORD(5, sc->sc_mixer_iface_no);
2930 
2931 	for (chy = 0; chy != 8; chy++) {
2932 		MIX(sc).wValue[0] = MAKE_WORD(9, chy + 1);
2933 		MIX(sc).type = MIX_SIGNED_16;
2934 		MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2935 		MIX(sc).name = "effect_send";
2936 		MIX(sc).nchan = 1;
2937 		MIX(sc).update[0] = 1;
2938 		snprintf(MIX(sc).desc, sizeof(MIX(sc).desc),
2939 		    "Effect Send AIn%d Volume", chy + 1);
2940 
2941 		uaudio_mixer_add_ctl(sc, &MIX(sc));
2942 
2943 		MIX(sc).wValue[0] = MAKE_WORD(9, chy + 1 + 8);
2944 		MIX(sc).type = MIX_SIGNED_16;
2945 		MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
2946 		MIX(sc).name = "effect_send";
2947 		MIX(sc).nchan = 1;
2948 		MIX(sc).update[0] = 1;
2949 		snprintf(MIX(sc).desc, sizeof(MIX(sc).desc),
2950 		    "Effect Send DIn%d Volume", chy + 1);
2951 
2952 		uaudio_mixer_add_ctl(sc, &MIX(sc));
2953 	}
2954 }
2955 
2956 static void
2957 uaudio_mixer_reload_all(struct uaudio_softc *sc)
2958 {
2959 	struct uaudio_mixer_node *pmc;
2960 	int chan;
2961 
2962 	if (sc->sc_mixer_lock == NULL)
2963 		return;
2964 
2965 	mtx_lock(sc->sc_mixer_lock);
2966 	for (pmc = sc->sc_mixer_root; pmc != NULL; pmc = pmc->next) {
2967 		/* use reset defaults for non-oss controlled settings */
2968 		if (pmc->ctl == SOUND_MIXER_NRDEVICES)
2969 			continue;
2970 		for (chan = 0; chan < pmc->nchan; chan++)
2971 			pmc->update[chan / 8] |= (1 << (chan % 8));
2972 	}
2973 	usbd_transfer_start(sc->sc_mixer_xfer[0]);
2974 
2975 	/* start HID volume keys, if any */
2976 	usbd_transfer_start(sc->sc_hid.xfer[0]);
2977 	mtx_unlock(sc->sc_mixer_lock);
2978 }
2979 
2980 static void
2981 uaudio_mixer_add_ctl_sub(struct uaudio_softc *sc, struct uaudio_mixer_node *mc)
2982 {
2983 	struct uaudio_mixer_node *p_mc_new =
2984 	    malloc(sizeof(*p_mc_new), M_USBDEV, M_WAITOK);
2985 	int ch;
2986 
2987 	if (p_mc_new != NULL) {
2988 		memcpy(p_mc_new, mc, sizeof(*p_mc_new));
2989 		p_mc_new->next = sc->sc_mixer_root;
2990 		sc->sc_mixer_root = p_mc_new;
2991 		sc->sc_mixer_count++;
2992 
2993 		/* set default value for all channels */
2994 		for (ch = 0; ch < p_mc_new->nchan; ch++) {
2995 			switch (p_mc_new->val_default) {
2996 			case 1:
2997 				/* 50% */
2998 				p_mc_new->wData[ch] = (p_mc_new->maxval + p_mc_new->minval) / 2;
2999 				break;
3000 			case 2:
3001 				/* 100% */
3002 				p_mc_new->wData[ch] = p_mc_new->maxval;
3003 				break;
3004 			default:
3005 				/* 0% */
3006 				p_mc_new->wData[ch] = p_mc_new->minval;
3007 				break;
3008 			}
3009 		}
3010 	} else {
3011 		DPRINTF("out of memory\n");
3012 	}
3013 }
3014 
3015 static void
3016 uaudio_mixer_add_ctl(struct uaudio_softc *sc, struct uaudio_mixer_node *mc)
3017 {
3018 	int32_t res;
3019 
3020 	if (mc->class < UAC_NCLASSES) {
3021 		DPRINTF("adding %s.%d\n",
3022 		    uac_names[mc->class], mc->ctl);
3023 	} else {
3024 		DPRINTF("adding %d\n", mc->ctl);
3025 	}
3026 
3027 	if (mc->type == MIX_ON_OFF) {
3028 		mc->minval = 0;
3029 		mc->maxval = 1;
3030 	} else if (mc->type == MIX_SELECTOR) {
3031 	} else {
3032 
3033 		/* determine min and max values */
3034 
3035 		mc->minval = uaudio_mixer_get(sc->sc_udev,
3036 		    sc->sc_audio_rev, GET_MIN, mc);
3037 		mc->maxval = uaudio_mixer_get(sc->sc_udev,
3038 		    sc->sc_audio_rev, GET_MAX, mc);
3039 
3040 		/* check if max and min was swapped */
3041 
3042 		if (mc->maxval < mc->minval) {
3043 			res = mc->maxval;
3044 			mc->maxval = mc->minval;
3045 			mc->minval = res;
3046 		}
3047 
3048 		/* compute value range */
3049 		mc->mul = mc->maxval - mc->minval;
3050 		if (mc->mul == 0)
3051 			mc->mul = 1;
3052 
3053 		/* compute value alignment */
3054 		res = uaudio_mixer_get(sc->sc_udev,
3055 		    sc->sc_audio_rev, GET_RES, mc);
3056 
3057 		DPRINTF("Resolution = %d\n", (int)res);
3058 	}
3059 
3060 	uaudio_mixer_add_ctl_sub(sc, mc);
3061 
3062 #ifdef USB_DEBUG
3063 	if (uaudio_debug > 2) {
3064 		uint8_t i;
3065 
3066 		for (i = 0; i < mc->nchan; i++) {
3067 			DPRINTF("[mix] wValue=%04x\n", mc->wValue[0]);
3068 		}
3069 		DPRINTF("[mix] wIndex=%04x type=%d ctl='%d' "
3070 		    "min=%d max=%d\n",
3071 		    mc->wIndex, mc->type, mc->ctl,
3072 		    mc->minval, mc->maxval);
3073 	}
3074 #endif
3075 }
3076 
3077 static void
3078 uaudio_mixer_add_mixer(struct uaudio_softc *sc,
3079     const struct uaudio_terminal_node *iot, int id)
3080 {
3081 	const struct usb_audio_mixer_unit_0 *d0 = iot[id].u.mu_v1;
3082 	const struct usb_audio_mixer_unit_1 *d1;
3083 
3084 	uint32_t bno;			/* bit number */
3085 	uint32_t p;			/* bit number accumulator */
3086 	uint32_t mo;			/* matching outputs */
3087 	uint32_t mc;			/* matching channels */
3088 	uint32_t ichs;			/* input channels */
3089 	uint32_t ochs;			/* output channels */
3090 	uint32_t c;
3091 	uint32_t chs;			/* channels */
3092 	uint32_t i;
3093 	uint32_t o;
3094 
3095 	DPRINTFN(3, "bUnitId=%d bNrInPins=%d\n",
3096 	    d0->bUnitId, d0->bNrInPins);
3097 
3098 	/* compute the number of input channels */
3099 
3100 	ichs = 0;
3101 	for (i = 0; i < d0->bNrInPins; i++) {
3102 		ichs += uaudio_mixer_get_cluster(
3103 		    d0->baSourceId[i], iot).bNrChannels;
3104 	}
3105 
3106 	d1 = (const void *)(d0->baSourceId + d0->bNrInPins);
3107 
3108 	/* and the number of output channels */
3109 
3110 	ochs = d1->bNrChannels;
3111 
3112 	DPRINTFN(3, "ichs=%d ochs=%d\n", ichs, ochs);
3113 
3114 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3115 
3116 	MIX(sc).wIndex = MAKE_WORD(d0->bUnitId, sc->sc_mixer_iface_no);
3117 	uaudio_mixer_determine_class(&iot[id], &MIX(sc));
3118 	MIX(sc).type = MIX_SIGNED_16;
3119 
3120 	if (uaudio_mixer_verify_desc(d0, ((ichs * ochs) + 7) / 8) == NULL)
3121 		return;
3122 
3123 	for (p = i = 0; i < d0->bNrInPins; i++) {
3124 		chs = uaudio_mixer_get_cluster(
3125 		    d0->baSourceId[i], iot).bNrChannels;
3126 		mc = 0;
3127 		for (c = 0; c < chs; c++) {
3128 			mo = 0;
3129 			for (o = 0; o < ochs; o++) {
3130 				bno = ((p + c) * ochs) + o;
3131 				if (BIT_TEST(d1->bmControls, bno))
3132 					mo++;
3133 			}
3134 			if (mo == 1)
3135 				mc++;
3136 		}
3137 		if ((mc == chs) && (chs <= MIX_MAX_CHAN)) {
3138 
3139 			/* repeat bit-scan */
3140 
3141 			mc = 0;
3142 			for (c = 0; c < chs; c++) {
3143 				for (o = 0; o < ochs; o++) {
3144 					bno = ((p + c) * ochs) + o;
3145 					if (BIT_TEST(d1->bmControls, bno))
3146 						MIX(sc).wValue[mc++] = MAKE_WORD(p + c + 1, o + 1);
3147 				}
3148 			}
3149 			MIX(sc).nchan = chs;
3150 			uaudio_mixer_add_ctl(sc, &MIX(sc));
3151 		}
3152 		p += chs;
3153 	}
3154 }
3155 
3156 static void
3157 uaudio20_mixer_add_mixer(struct uaudio_softc *sc,
3158     const struct uaudio_terminal_node *iot, int id)
3159 {
3160 	const struct usb_audio20_mixer_unit_0 *d0 = iot[id].u.mu_v2;
3161 	const struct usb_audio20_mixer_unit_1 *d1;
3162 
3163 	uint32_t bno;			/* bit number */
3164 	uint32_t p;			/* bit number accumulator */
3165 	uint32_t mo;			/* matching outputs */
3166 	uint32_t mc;			/* matching channels */
3167 	uint32_t ichs;			/* input channels */
3168 	uint32_t ochs;			/* output channels */
3169 	uint32_t c;
3170 	uint32_t chs;			/* channels */
3171 	uint32_t i;
3172 	uint32_t o;
3173 
3174 	DPRINTFN(3, "bUnitId=%d bNrInPins=%d\n",
3175 	    d0->bUnitId, d0->bNrInPins);
3176 
3177 	/* compute the number of input channels */
3178 
3179 	ichs = 0;
3180 	for (i = 0; i < d0->bNrInPins; i++) {
3181 		ichs += uaudio20_mixer_get_cluster(
3182 		    d0->baSourceId[i], iot).bNrChannels;
3183 	}
3184 
3185 	d1 = (const void *)(d0->baSourceId + d0->bNrInPins);
3186 
3187 	/* and the number of output channels */
3188 
3189 	ochs = d1->bNrChannels;
3190 
3191 	DPRINTFN(3, "ichs=%d ochs=%d\n", ichs, ochs);
3192 
3193 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3194 
3195 	MIX(sc).wIndex = MAKE_WORD(d0->bUnitId, sc->sc_mixer_iface_no);
3196 	uaudio20_mixer_determine_class(&iot[id], &MIX(sc));
3197 	MIX(sc).type = MIX_SIGNED_16;
3198 
3199 	if (uaudio20_mixer_verify_desc(d0, ((ichs * ochs) + 7) / 8) == NULL)
3200 		return;
3201 
3202 	for (p = i = 0; i < d0->bNrInPins; i++) {
3203 		chs = uaudio20_mixer_get_cluster(
3204 		    d0->baSourceId[i], iot).bNrChannels;
3205 		mc = 0;
3206 		for (c = 0; c < chs; c++) {
3207 			mo = 0;
3208 			for (o = 0; o < ochs; o++) {
3209 				bno = ((p + c) * ochs) + o;
3210 				if (BIT_TEST(d1->bmControls, bno))
3211 					mo++;
3212 			}
3213 			if (mo == 1)
3214 				mc++;
3215 		}
3216 		if ((mc == chs) && (chs <= MIX_MAX_CHAN)) {
3217 
3218 			/* repeat bit-scan */
3219 
3220 			mc = 0;
3221 			for (c = 0; c < chs; c++) {
3222 				for (o = 0; o < ochs; o++) {
3223 					bno = ((p + c) * ochs) + o;
3224 					if (BIT_TEST(d1->bmControls, bno))
3225 						MIX(sc).wValue[mc++] = MAKE_WORD(p + c + 1, o + 1);
3226 				}
3227 			}
3228 			MIX(sc).nchan = chs;
3229 			uaudio_mixer_add_ctl(sc, &MIX(sc));
3230 		}
3231 		p += chs;
3232 	}
3233 }
3234 
3235 static void
3236 uaudio_mixer_add_selector(struct uaudio_softc *sc,
3237     const struct uaudio_terminal_node *iot, int id)
3238 {
3239 	const struct usb_audio_selector_unit *d = iot[id].u.su_v1;
3240 	uint16_t i;
3241 
3242 	DPRINTFN(3, "bUnitId=%d bNrInPins=%d\n",
3243 	    d->bUnitId, d->bNrInPins);
3244 
3245 	if (d->bNrInPins == 0)
3246 		return;
3247 
3248 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3249 
3250 	MIX(sc).wIndex = MAKE_WORD(d->bUnitId, sc->sc_mixer_iface_no);
3251 	MIX(sc).wValue[0] = MAKE_WORD(0, 0);
3252 	uaudio_mixer_determine_class(&iot[id], &MIX(sc));
3253 	MIX(sc).nchan = 1;
3254 	MIX(sc).type = MIX_SELECTOR;
3255 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
3256 	MIX(sc).minval = 1;
3257 	MIX(sc).maxval = d->bNrInPins;
3258 	MIX(sc).name = "selector";
3259 
3260 	i = d->baSourceId[d->bNrInPins];
3261 	if (i == 0 ||
3262 	    usbd_req_get_string_any(sc->sc_udev, NULL,
3263 	    MIX(sc).desc, sizeof(MIX(sc).desc), i) != 0) {
3264 		MIX(sc).desc[0] = 0;
3265 	}
3266 
3267 	if (MIX(sc).maxval > MAX_SELECTOR_INPUT_PIN) {
3268 		MIX(sc).maxval = MAX_SELECTOR_INPUT_PIN;
3269 	}
3270 	MIX(sc).mul = (MIX(sc).maxval - MIX(sc).minval);
3271 	for (i = 0; i < MAX_SELECTOR_INPUT_PIN; i++) {
3272 		MIX(sc).slctrtype[i] = SOUND_MIXER_NRDEVICES;
3273 	}
3274 
3275 	for (i = 0; i < MIX(sc).maxval; i++) {
3276 		MIX(sc).slctrtype[i] = uaudio_mixer_feature_name(
3277 		    &iot[d->baSourceId[i]], &MIX(sc));
3278 	}
3279 
3280 	MIX(sc).class = 0;			/* not used */
3281 
3282 	uaudio_mixer_add_ctl(sc, &MIX(sc));
3283 }
3284 
3285 static void
3286 uaudio20_mixer_add_selector(struct uaudio_softc *sc,
3287     const struct uaudio_terminal_node *iot, int id)
3288 {
3289 	const struct usb_audio20_selector_unit *d = iot[id].u.su_v2;
3290 	uint16_t i;
3291 
3292 	DPRINTFN(3, "bUnitId=%d bNrInPins=%d\n",
3293 	    d->bUnitId, d->bNrInPins);
3294 
3295 	if (d->bNrInPins == 0)
3296 		return;
3297 
3298 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3299 
3300 	MIX(sc).wIndex = MAKE_WORD(d->bUnitId, sc->sc_mixer_iface_no);
3301 	MIX(sc).wValue[0] = MAKE_WORD(0, 0);
3302 	uaudio20_mixer_determine_class(&iot[id], &MIX(sc));
3303 	MIX(sc).nchan = 1;
3304 	MIX(sc).type = MIX_SELECTOR;
3305 	MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
3306 	MIX(sc).minval = 1;
3307 	MIX(sc).maxval = d->bNrInPins;
3308 	MIX(sc).name = "selector";
3309 
3310 	i = d->baSourceId[d->bNrInPins];
3311 	if (i == 0 ||
3312 	    usbd_req_get_string_any(sc->sc_udev, NULL,
3313 	    MIX(sc).desc, sizeof(MIX(sc).desc), i) != 0) {
3314 		MIX(sc).desc[0] = 0;
3315 	}
3316 
3317 	if (MIX(sc).maxval > MAX_SELECTOR_INPUT_PIN)
3318 		MIX(sc).maxval = MAX_SELECTOR_INPUT_PIN;
3319 
3320 	MIX(sc).mul = (MIX(sc).maxval - MIX(sc).minval);
3321 	for (i = 0; i < MAX_SELECTOR_INPUT_PIN; i++)
3322 		MIX(sc).slctrtype[i] = SOUND_MIXER_NRDEVICES;
3323 
3324 	for (i = 0; i < MIX(sc).maxval; i++) {
3325 		MIX(sc).slctrtype[i] = uaudio20_mixer_feature_name(
3326 		    &iot[d->baSourceId[i]], &MIX(sc));
3327 	}
3328 
3329 	MIX(sc).class = 0;			/* not used */
3330 
3331 	uaudio_mixer_add_ctl(sc, &MIX(sc));
3332 }
3333 
3334 static uint32_t
3335 uaudio_mixer_feature_get_bmaControls(const struct usb_audio_feature_unit *d,
3336     uint8_t i)
3337 {
3338 	uint32_t temp = 0;
3339 	uint32_t offset = (i * d->bControlSize);
3340 
3341 	if (d->bControlSize > 0) {
3342 		temp |= d->bmaControls[offset];
3343 		if (d->bControlSize > 1) {
3344 			temp |= d->bmaControls[offset + 1] << 8;
3345 			if (d->bControlSize > 2) {
3346 				temp |= d->bmaControls[offset + 2] << 16;
3347 				if (d->bControlSize > 3) {
3348 					temp |= d->bmaControls[offset + 3] << 24;
3349 				}
3350 			}
3351 		}
3352 	}
3353 	return (temp);
3354 }
3355 
3356 static void
3357 uaudio_mixer_add_feature(struct uaudio_softc *sc,
3358     const struct uaudio_terminal_node *iot, int id)
3359 {
3360 	const struct usb_audio_feature_unit *d = iot[id].u.fu_v1;
3361 	uint32_t fumask;
3362 	uint32_t mmask;
3363 	uint32_t cmask;
3364 	uint16_t mixernumber;
3365 	uint8_t nchan;
3366 	uint8_t chan;
3367 	uint8_t ctl;
3368 	uint8_t i;
3369 
3370 	if (d->bControlSize == 0)
3371 		return;
3372 
3373 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3374 
3375 	nchan = (d->bLength - 7) / d->bControlSize;
3376 	mmask = uaudio_mixer_feature_get_bmaControls(d, 0);
3377 	cmask = 0;
3378 
3379 	if (nchan == 0)
3380 		return;
3381 
3382 	/* figure out what we can control */
3383 
3384 	for (chan = 1; chan < nchan; chan++) {
3385 		DPRINTFN(10, "chan=%d mask=%x\n",
3386 		    chan, uaudio_mixer_feature_get_bmaControls(d, chan));
3387 
3388 		cmask |= uaudio_mixer_feature_get_bmaControls(d, chan);
3389 	}
3390 
3391 	if (nchan > MIX_MAX_CHAN) {
3392 		nchan = MIX_MAX_CHAN;
3393 	}
3394 	MIX(sc).wIndex = MAKE_WORD(d->bUnitId, sc->sc_mixer_iface_no);
3395 
3396 	i = d->bmaControls[d->bControlSize];
3397 	if (i == 0 ||
3398 	    usbd_req_get_string_any(sc->sc_udev, NULL,
3399 	    MIX(sc).desc, sizeof(MIX(sc).desc), i) != 0) {
3400 		MIX(sc).desc[0] = 0;
3401 	}
3402 
3403 	for (ctl = 1; ctl <= LOUDNESS_CONTROL; ctl++) {
3404 
3405 		fumask = FU_MASK(ctl);
3406 
3407 		DPRINTFN(5, "ctl=%d fumask=0x%04x\n",
3408 		    ctl, fumask);
3409 
3410 		if (mmask & fumask) {
3411 			MIX(sc).nchan = 1;
3412 			MIX(sc).wValue[0] = MAKE_WORD(ctl, 0);
3413 		} else if (cmask & fumask) {
3414 			MIX(sc).nchan = nchan - 1;
3415 			for (i = 1; i < nchan; i++) {
3416 				if (uaudio_mixer_feature_get_bmaControls(d, i) & fumask)
3417 					MIX(sc).wValue[i - 1] = MAKE_WORD(ctl, i);
3418 				else
3419 					MIX(sc).wValue[i - 1] = -1;
3420 			}
3421 		} else {
3422 			continue;
3423 		}
3424 
3425 		mixernumber = uaudio_mixer_feature_name(&iot[id], &MIX(sc));
3426 
3427 		switch (ctl) {
3428 		case MUTE_CONTROL:
3429 			MIX(sc).type = MIX_ON_OFF;
3430 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
3431 			MIX(sc).name = "mute";
3432 			break;
3433 
3434 		case VOLUME_CONTROL:
3435 			MIX(sc).type = MIX_SIGNED_16;
3436 			MIX(sc).ctl = mixernumber;
3437 			MIX(sc).name = "vol";
3438 			break;
3439 
3440 		case BASS_CONTROL:
3441 			MIX(sc).type = MIX_SIGNED_8;
3442 			MIX(sc).ctl = SOUND_MIXER_BASS;
3443 			MIX(sc).name = "bass";
3444 			break;
3445 
3446 		case MID_CONTROL:
3447 			MIX(sc).type = MIX_SIGNED_8;
3448 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3449 			MIX(sc).name = "mid";
3450 			break;
3451 
3452 		case TREBLE_CONTROL:
3453 			MIX(sc).type = MIX_SIGNED_8;
3454 			MIX(sc).ctl = SOUND_MIXER_TREBLE;
3455 			MIX(sc).name = "treble";
3456 			break;
3457 
3458 		case GRAPHIC_EQUALIZER_CONTROL:
3459 			continue;	/* XXX don't add anything */
3460 
3461 		case AGC_CONTROL:
3462 			MIX(sc).type = MIX_ON_OFF;
3463 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3464 			MIX(sc).name = "agc";
3465 			break;
3466 
3467 		case DELAY_CONTROL:
3468 			MIX(sc).type = MIX_UNSIGNED_16;
3469 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3470 			MIX(sc).name = "delay";
3471 			break;
3472 
3473 		case BASS_BOOST_CONTROL:
3474 			MIX(sc).type = MIX_ON_OFF;
3475 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3476 			MIX(sc).name = "boost";
3477 			break;
3478 
3479 		case LOUDNESS_CONTROL:
3480 			MIX(sc).type = MIX_ON_OFF;
3481 			MIX(sc).ctl = SOUND_MIXER_LOUD;	/* Is this correct ? */
3482 			MIX(sc).name = "loudness";
3483 			break;
3484 
3485 		default:
3486 			MIX(sc).type = MIX_UNKNOWN;
3487 			break;
3488 		}
3489 
3490 		if (MIX(sc).type != MIX_UNKNOWN)
3491 			uaudio_mixer_add_ctl(sc, &MIX(sc));
3492 	}
3493 }
3494 
3495 static void
3496 uaudio20_mixer_add_feature(struct uaudio_softc *sc,
3497     const struct uaudio_terminal_node *iot, int id)
3498 {
3499 	const struct usb_audio20_feature_unit *d = iot[id].u.fu_v2;
3500 	uint32_t ctl;
3501 	uint32_t mmask;
3502 	uint32_t cmask;
3503 	uint16_t mixernumber;
3504 	uint8_t nchan;
3505 	uint8_t chan;
3506 	uint8_t i;
3507 	uint8_t what;
3508 
3509 	if (UGETDW(d->bmaControls[0]) == 0)
3510 		return;
3511 
3512 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3513 
3514 	nchan = (d->bLength - 6) / 4;
3515 	mmask = UGETDW(d->bmaControls[0]);
3516 	cmask = 0;
3517 
3518 	if (nchan == 0)
3519 		return;
3520 
3521 	/* figure out what we can control */
3522 
3523 	for (chan = 1; chan < nchan; chan++)
3524 		cmask |= UGETDW(d->bmaControls[chan]);
3525 
3526 	if (nchan > MIX_MAX_CHAN)
3527 		nchan = MIX_MAX_CHAN;
3528 
3529 	MIX(sc).wIndex = MAKE_WORD(d->bUnitId, sc->sc_mixer_iface_no);
3530 
3531 	i = d->bmaControls[nchan][0];
3532 	if (i == 0 ||
3533 	    usbd_req_get_string_any(sc->sc_udev, NULL,
3534 	    MIX(sc).desc, sizeof(MIX(sc).desc), i) != 0) {
3535 		MIX(sc).desc[0] = 0;
3536 	}
3537 
3538 	for (ctl = 3; ctl != 0; ctl <<= 2) {
3539 
3540 		mixernumber = uaudio20_mixer_feature_name(&iot[id], &MIX(sc));
3541 
3542 		switch (ctl) {
3543 		case (3 << 0):
3544 			MIX(sc).type = MIX_ON_OFF;
3545 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;
3546 			MIX(sc).name = "mute";
3547 			what = MUTE_CONTROL;
3548 			break;
3549 		case (3 << 2):
3550 			MIX(sc).type = MIX_SIGNED_16;
3551 			MIX(sc).ctl = mixernumber;
3552 			MIX(sc).name = "vol";
3553 			what = VOLUME_CONTROL;
3554 			break;
3555 		case (3 << 4):
3556 			MIX(sc).type = MIX_SIGNED_8;
3557 			MIX(sc).ctl = SOUND_MIXER_BASS;
3558 			MIX(sc).name = "bass";
3559 			what = BASS_CONTROL;
3560 			break;
3561 		case (3 << 6):
3562 			MIX(sc).type = MIX_SIGNED_8;
3563 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3564 			MIX(sc).name = "mid";
3565 			what = MID_CONTROL;
3566 			break;
3567 		case (3 << 8):
3568 			MIX(sc).type = MIX_SIGNED_8;
3569 			MIX(sc).ctl = SOUND_MIXER_TREBLE;
3570 			MIX(sc).name = "treble";
3571 			what = TREBLE_CONTROL;
3572 			break;
3573 		case (3 << 12):
3574 			MIX(sc).type = MIX_ON_OFF;
3575 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3576 			MIX(sc).name = "agc";
3577 			what = AGC_CONTROL;
3578 			break;
3579 		case (3 << 14):
3580 			MIX(sc).type = MIX_UNSIGNED_16;
3581 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3582 			MIX(sc).name = "delay";
3583 			what = DELAY_CONTROL;
3584 			break;
3585 		case (3 << 16):
3586 			MIX(sc).type = MIX_ON_OFF;
3587 			MIX(sc).ctl = SOUND_MIXER_NRDEVICES;	/* XXXXX */
3588 			MIX(sc).name = "boost";
3589 			what = BASS_BOOST_CONTROL;
3590 			break;
3591 		case (3 << 18):
3592 			MIX(sc).type = MIX_ON_OFF;
3593 			MIX(sc).ctl = SOUND_MIXER_LOUD;	/* Is this correct ? */
3594 			MIX(sc).name = "loudness";
3595 			what = LOUDNESS_CONTROL;
3596 			break;
3597 		case (3 << 20):
3598 			MIX(sc).type = MIX_SIGNED_16;
3599 			MIX(sc).ctl = mixernumber;
3600 			MIX(sc).name = "igain";
3601 			what = INPUT_GAIN_CONTROL;
3602 			break;
3603 		case (3 << 22):
3604 			MIX(sc).type = MIX_SIGNED_16;
3605 			MIX(sc).ctl = mixernumber;
3606 			MIX(sc).name = "igainpad";
3607 			what = INPUT_GAIN_PAD_CONTROL;
3608 			break;
3609 		default:
3610 			continue;
3611 		}
3612 
3613 		if ((mmask & ctl) == ctl) {
3614 			MIX(sc).nchan = 1;
3615 			MIX(sc).wValue[0] = MAKE_WORD(what, 0);
3616 		} else if ((cmask & ctl) == ctl) {
3617 			MIX(sc).nchan = nchan - 1;
3618 			for (i = 1; i < nchan; i++) {
3619 				if ((UGETDW(d->bmaControls[i]) & ctl) == ctl)
3620 					MIX(sc).wValue[i - 1] = MAKE_WORD(what, i);
3621 				else
3622 					MIX(sc).wValue[i - 1] = -1;
3623 			}
3624 		} else {
3625 			continue;
3626 		}
3627 
3628 		if (MIX(sc).type != MIX_UNKNOWN)
3629 			uaudio_mixer_add_ctl(sc, &MIX(sc));
3630 	}
3631 }
3632 
3633 static void
3634 uaudio_mixer_add_processing_updown(struct uaudio_softc *sc,
3635     const struct uaudio_terminal_node *iot, int id)
3636 {
3637 	const struct usb_audio_processing_unit_0 *d0 = iot[id].u.pu_v1;
3638 	const struct usb_audio_processing_unit_1 *d1 =
3639 	    (const void *)(d0->baSourceId + d0->bNrInPins);
3640 	const struct usb_audio_processing_unit_updown *ud =
3641 	    (const void *)(d1->bmControls + d1->bControlSize);
3642 	uint8_t i;
3643 
3644 	if (uaudio_mixer_verify_desc(d0, sizeof(*ud)) == NULL) {
3645 		return;
3646 	}
3647 	if (uaudio_mixer_verify_desc(d0, sizeof(*ud) + (2 * ud->bNrModes))
3648 	    == NULL) {
3649 		return;
3650 	}
3651 	DPRINTFN(3, "bUnitId=%d bNrModes=%d\n",
3652 	    d0->bUnitId, ud->bNrModes);
3653 
3654 	if (!(d1->bmControls[0] & UA_PROC_MASK(UD_MODE_SELECT_CONTROL))) {
3655 		DPRINTF("no mode select\n");
3656 		return;
3657 	}
3658 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3659 
3660 	MIX(sc).wIndex = MAKE_WORD(d0->bUnitId, sc->sc_mixer_iface_no);
3661 	MIX(sc).nchan = 1;
3662 	MIX(sc).wValue[0] = MAKE_WORD(UD_MODE_SELECT_CONTROL, 0);
3663 	uaudio_mixer_determine_class(&iot[id], &MIX(sc));
3664 	MIX(sc).type = MIX_ON_OFF;		/* XXX */
3665 
3666 	for (i = 0; i < ud->bNrModes; i++) {
3667 		DPRINTFN(3, "i=%d bm=0x%x\n", i, UGETW(ud->waModes[i]));
3668 		/* XXX */
3669 	}
3670 
3671 	uaudio_mixer_add_ctl(sc, &MIX(sc));
3672 }
3673 
3674 static void
3675 uaudio_mixer_add_processing(struct uaudio_softc *sc,
3676     const struct uaudio_terminal_node *iot, int id)
3677 {
3678 	const struct usb_audio_processing_unit_0 *d0 = iot[id].u.pu_v1;
3679 	const struct usb_audio_processing_unit_1 *d1 =
3680 	    (const void *)(d0->baSourceId + d0->bNrInPins);
3681 	uint16_t ptype;
3682 
3683 	memset(&MIX(sc), 0, sizeof(MIX(sc)));
3684 
3685 	ptype = UGETW(d0->wProcessType);
3686 
3687 	DPRINTFN(3, "wProcessType=%d bUnitId=%d "
3688 	    "bNrInPins=%d\n", ptype, d0->bUnitId, d0->bNrInPins);
3689 
3690 	if (d1->bControlSize == 0) {
3691 		return;
3692 	}
3693 	if (d1->bmControls[0] & UA_PROC_ENABLE_MASK) {
3694 		MIX(sc).wIndex = MAKE_WORD(d0->bUnitId, sc->sc_mixer_iface_no);
3695 		MIX(sc).nchan = 1;
3696 		MIX(sc).wValue[0] = MAKE_WORD(XX_ENABLE_CONTROL, 0);
3697 		uaudio_mixer_determine_class(&iot[id], &MIX(sc));
3698 		MIX(sc).type = MIX_ON_OFF;
3699 		uaudio_mixer_add_ctl(sc, &MIX(sc));
3700 	}
3701 	switch (ptype) {
3702 	case UPDOWNMIX_PROCESS:
3703 		uaudio_mixer_add_processing_updown(sc, iot, id);
3704 		break;
3705 
3706 	case DOLBY_PROLOGIC_PROCESS:
3707 	case P3D_STEREO_EXTENDER_PROCESS:
3708 	case REVERBATION_PROCESS:
3709 	case CHORUS_PROCESS:
3710 	case DYN_RANGE_COMP_PROCESS:
3711 	default:
3712 		DPRINTF("unit %d, type=%d is not implemented\n",
3713 		    d0->bUnitId, ptype);
3714 		break;
3715 	}
3716 }
3717 
3718 static void
3719 uaudio_mixer_add_extension(struct uaudio_softc *sc,
3720     const struct uaudio_terminal_node *iot, int id)
3721 {
3722 	const struct usb_audio_extension_unit_0 *d0 = iot[id].u.eu_v1;
3723 	const struct usb_audio_extension_unit_1 *d1 =
3724 	    (const void *)(d0->baSourceId + d0->bNrInPins);
3725 
3726 	DPRINTFN(3, "bUnitId=%d bNrInPins=%d\n",
3727 	    d0->bUnitId, d0->bNrInPins);
3728 
3729 	if (sc->sc_uq_au_no_xu) {
3730 		return;
3731 	}
3732 	if (d1->bControlSize == 0) {
3733 		return;
3734 	}
3735 	if (d1->bmControls[0] & UA_EXT_ENABLE_MASK) {
3736 
3737 		memset(&MIX(sc), 0, sizeof(MIX(sc)));
3738 
3739 		MIX(sc).wIndex = MAKE_WORD(d0->bUnitId, sc->sc_mixer_iface_no);
3740 		MIX(sc).nchan = 1;
3741 		MIX(sc).wValue[0] = MAKE_WORD(UA_EXT_ENABLE, 0);
3742 		uaudio_mixer_determine_class(&iot[id], &MIX(sc));
3743 		MIX(sc).type = MIX_ON_OFF;
3744 
3745 		uaudio_mixer_add_ctl(sc, &MIX(sc));
3746 	}
3747 }
3748 
3749 static const void *
3750 uaudio_mixer_verify_desc(const void *arg, uint32_t len)
3751 {
3752 	const struct usb_audio_mixer_unit_1 *d1;
3753 	const struct usb_audio_extension_unit_1 *e1;
3754 	const struct usb_audio_processing_unit_1 *u1;
3755 
3756 	union {
3757 		const struct usb_descriptor *desc;
3758 		const struct usb_audio_input_terminal *it;
3759 		const struct usb_audio_output_terminal *ot;
3760 		const struct usb_audio_mixer_unit_0 *mu;
3761 		const struct usb_audio_selector_unit *su;
3762 		const struct usb_audio_feature_unit *fu;
3763 		const struct usb_audio_processing_unit_0 *pu;
3764 		const struct usb_audio_extension_unit_0 *eu;
3765 	}     u;
3766 
3767 	u.desc = arg;
3768 
3769 	if (u.desc == NULL) {
3770 		goto error;
3771 	}
3772 	if (u.desc->bDescriptorType != UDESC_CS_INTERFACE) {
3773 		goto error;
3774 	}
3775 	switch (u.desc->bDescriptorSubtype) {
3776 	case UDESCSUB_AC_INPUT:
3777 		len += sizeof(*u.it);
3778 		break;
3779 
3780 	case UDESCSUB_AC_OUTPUT:
3781 		len += sizeof(*u.ot);
3782 		break;
3783 
3784 	case UDESCSUB_AC_MIXER:
3785 		len += sizeof(*u.mu);
3786 
3787 		if (u.desc->bLength < len) {
3788 			goto error;
3789 		}
3790 		len += u.mu->bNrInPins;
3791 
3792 		if (u.desc->bLength < len) {
3793 			goto error;
3794 		}
3795 		d1 = (const void *)(u.mu->baSourceId + u.mu->bNrInPins);
3796 
3797 		len += sizeof(*d1);
3798 		break;
3799 
3800 	case UDESCSUB_AC_SELECTOR:
3801 		len += sizeof(*u.su);
3802 
3803 		if (u.desc->bLength < len) {
3804 			goto error;
3805 		}
3806 		len += u.su->bNrInPins + 1;
3807 		break;
3808 
3809 	case UDESCSUB_AC_FEATURE:
3810 		len += sizeof(*u.fu) + 1;
3811 
3812 		if (u.desc->bLength < len)
3813 			goto error;
3814 
3815 		len += u.fu->bControlSize;
3816 		break;
3817 
3818 	case UDESCSUB_AC_PROCESSING:
3819 		len += sizeof(*u.pu);
3820 
3821 		if (u.desc->bLength < len) {
3822 			goto error;
3823 		}
3824 		len += u.pu->bNrInPins;
3825 
3826 		if (u.desc->bLength < len) {
3827 			goto error;
3828 		}
3829 		u1 = (const void *)(u.pu->baSourceId + u.pu->bNrInPins);
3830 
3831 		len += sizeof(*u1);
3832 
3833 		if (u.desc->bLength < len) {
3834 			goto error;
3835 		}
3836 		len += u1->bControlSize;
3837 
3838 		break;
3839 
3840 	case UDESCSUB_AC_EXTENSION:
3841 		len += sizeof(*u.eu);
3842 
3843 		if (u.desc->bLength < len) {
3844 			goto error;
3845 		}
3846 		len += u.eu->bNrInPins;
3847 
3848 		if (u.desc->bLength < len) {
3849 			goto error;
3850 		}
3851 		e1 = (const void *)(u.eu->baSourceId + u.eu->bNrInPins);
3852 
3853 		len += sizeof(*e1);
3854 
3855 		if (u.desc->bLength < len) {
3856 			goto error;
3857 		}
3858 		len += e1->bControlSize;
3859 		break;
3860 
3861 	default:
3862 		goto error;
3863 	}
3864 
3865 	if (u.desc->bLength < len) {
3866 		goto error;
3867 	}
3868 	return (u.desc);
3869 
3870 error:
3871 	if (u.desc) {
3872 		DPRINTF("invalid descriptor, type=%d, "
3873 		    "sub_type=%d, len=%d of %d bytes\n",
3874 		    u.desc->bDescriptorType,
3875 		    u.desc->bDescriptorSubtype,
3876 		    u.desc->bLength, len);
3877 	}
3878 	return (NULL);
3879 }
3880 
3881 static const void *
3882 uaudio20_mixer_verify_desc(const void *arg, uint32_t len)
3883 {
3884 	const struct usb_audio20_mixer_unit_1 *d1;
3885 	const struct usb_audio20_extension_unit_1 *e1;
3886 	const struct usb_audio20_processing_unit_1 *u1;
3887 	const struct usb_audio20_clock_selector_unit_1 *c1;
3888 
3889 	union {
3890 		const struct usb_descriptor *desc;
3891 		const struct usb_audio20_clock_source_unit *csrc;
3892 		const struct usb_audio20_clock_selector_unit_0 *csel;
3893 		const struct usb_audio20_clock_multiplier_unit *cmul;
3894 		const struct usb_audio20_input_terminal *it;
3895 		const struct usb_audio20_output_terminal *ot;
3896 		const struct usb_audio20_mixer_unit_0 *mu;
3897 		const struct usb_audio20_selector_unit *su;
3898 		const struct usb_audio20_feature_unit *fu;
3899 		const struct usb_audio20_sample_rate_unit *ru;
3900 		const struct usb_audio20_processing_unit_0 *pu;
3901 		const struct usb_audio20_extension_unit_0 *eu;
3902 		const struct usb_audio20_effect_unit *ef;
3903 	}     u;
3904 
3905 	u.desc = arg;
3906 
3907 	if (u.desc == NULL)
3908 		goto error;
3909 
3910 	if (u.desc->bDescriptorType != UDESC_CS_INTERFACE)
3911 		goto error;
3912 
3913 	switch (u.desc->bDescriptorSubtype) {
3914 	case UDESCSUB_AC_INPUT:
3915 		len += sizeof(*u.it);
3916 		break;
3917 
3918 	case UDESCSUB_AC_OUTPUT:
3919 		len += sizeof(*u.ot);
3920 		break;
3921 
3922 	case UDESCSUB_AC_MIXER:
3923 		len += sizeof(*u.mu);
3924 
3925 		if (u.desc->bLength < len)
3926 			goto error;
3927 		len += u.mu->bNrInPins;
3928 
3929 		if (u.desc->bLength < len)
3930 			goto error;
3931 
3932 		d1 = (const void *)(u.mu->baSourceId + u.mu->bNrInPins);
3933 
3934 		len += sizeof(*d1) + d1->bNrChannels;
3935 		break;
3936 
3937 	case UDESCSUB_AC_SELECTOR:
3938 		len += sizeof(*u.su);
3939 
3940 		if (u.desc->bLength < len)
3941 			goto error;
3942 
3943 		len += u.su->bNrInPins + 1;
3944 		break;
3945 
3946 	case UDESCSUB_AC_FEATURE:
3947 		len += sizeof(*u.fu) + 1;
3948 		break;
3949 
3950 	case UDESCSUB_AC_EFFECT:
3951 		len += sizeof(*u.ef) + 4;
3952 		break;
3953 
3954 	case UDESCSUB_AC_PROCESSING_V2:
3955 		len += sizeof(*u.pu);
3956 
3957 		if (u.desc->bLength < len)
3958 			goto error;
3959 
3960 		len += u.pu->bNrInPins;
3961 
3962 		if (u.desc->bLength < len)
3963 			goto error;
3964 
3965 		u1 = (const void *)(u.pu->baSourceId + u.pu->bNrInPins);
3966 
3967 		len += sizeof(*u1);
3968 		break;
3969 
3970 	case UDESCSUB_AC_EXTENSION_V2:
3971 		len += sizeof(*u.eu);
3972 
3973 		if (u.desc->bLength < len)
3974 			goto error;
3975 
3976 		len += u.eu->bNrInPins;
3977 
3978 		if (u.desc->bLength < len)
3979 			goto error;
3980 
3981 		e1 = (const void *)(u.eu->baSourceId + u.eu->bNrInPins);
3982 
3983 		len += sizeof(*e1);
3984 		break;
3985 
3986 	case UDESCSUB_AC_CLOCK_SRC:
3987 		len += sizeof(*u.csrc);
3988 		break;
3989 
3990 	case UDESCSUB_AC_CLOCK_SEL:
3991 		len += sizeof(*u.csel);
3992 
3993 		if (u.desc->bLength < len)
3994 			goto error;
3995 
3996 		len += u.csel->bNrInPins;
3997 
3998 		if (u.desc->bLength < len)
3999 			goto error;
4000 
4001 		c1 = (const void *)(u.csel->baCSourceId + u.csel->bNrInPins);
4002 
4003 		len += sizeof(*c1);
4004 		break;
4005 
4006 	case UDESCSUB_AC_CLOCK_MUL:
4007 		len += sizeof(*u.cmul);
4008 		break;
4009 
4010 	case UDESCSUB_AC_SAMPLE_RT:
4011 		len += sizeof(*u.ru);
4012 		break;
4013 
4014 	default:
4015 		goto error;
4016 	}
4017 
4018 	if (u.desc->bLength < len)
4019 		goto error;
4020 
4021 	return (u.desc);
4022 
4023 error:
4024 	if (u.desc) {
4025 		DPRINTF("invalid descriptor, type=%d, "
4026 		    "sub_type=%d, len=%d of %d bytes\n",
4027 		    u.desc->bDescriptorType,
4028 		    u.desc->bDescriptorSubtype,
4029 		    u.desc->bLength, len);
4030 	}
4031 	return (NULL);
4032 }
4033 
4034 static struct usb_audio_cluster
4035 uaudio_mixer_get_cluster(uint8_t id, const struct uaudio_terminal_node *iot)
4036 {
4037 	struct usb_audio_cluster r;
4038 	const struct usb_descriptor *dp;
4039 	uint8_t i;
4040 
4041 	for (i = 0; i < UAUDIO_RECURSE_LIMIT; i++) {	/* avoid infinite loops */
4042 		dp = iot[id].u.desc;
4043 		if (dp == NULL) {
4044 			goto error;
4045 		}
4046 		switch (dp->bDescriptorSubtype) {
4047 		case UDESCSUB_AC_INPUT:
4048 			r.bNrChannels = iot[id].u.it_v1->bNrChannels;
4049 			r.wChannelConfig[0] = iot[id].u.it_v1->wChannelConfig[0];
4050 			r.wChannelConfig[1] = iot[id].u.it_v1->wChannelConfig[1];
4051 			r.iChannelNames = iot[id].u.it_v1->iChannelNames;
4052 			goto done;
4053 
4054 		case UDESCSUB_AC_OUTPUT:
4055 			id = iot[id].u.ot_v1->bSourceId;
4056 			break;
4057 
4058 		case UDESCSUB_AC_MIXER:
4059 			r = *(const struct usb_audio_cluster *)
4060 			    &iot[id].u.mu_v1->baSourceId[
4061 			    iot[id].u.mu_v1->bNrInPins];
4062 			goto done;
4063 
4064 		case UDESCSUB_AC_SELECTOR:
4065 			if (iot[id].u.su_v1->bNrInPins > 0) {
4066 				/* XXX This is not really right */
4067 				id = iot[id].u.su_v1->baSourceId[0];
4068 			}
4069 			break;
4070 
4071 		case UDESCSUB_AC_FEATURE:
4072 			id = iot[id].u.fu_v1->bSourceId;
4073 			break;
4074 
4075 		case UDESCSUB_AC_PROCESSING:
4076 			r = *((const struct usb_audio_cluster *)
4077 			    &iot[id].u.pu_v1->baSourceId[
4078 			    iot[id].u.pu_v1->bNrInPins]);
4079 			goto done;
4080 
4081 		case UDESCSUB_AC_EXTENSION:
4082 			r = *((const struct usb_audio_cluster *)
4083 			    &iot[id].u.eu_v1->baSourceId[
4084 			    iot[id].u.eu_v1->bNrInPins]);
4085 			goto done;
4086 
4087 		default:
4088 			goto error;
4089 		}
4090 	}
4091 error:
4092 	DPRINTF("bad data\n");
4093 	memset(&r, 0, sizeof(r));
4094 done:
4095 	return (r);
4096 }
4097 
4098 static struct usb_audio20_cluster
4099 uaudio20_mixer_get_cluster(uint8_t id, const struct uaudio_terminal_node *iot)
4100 {
4101 	struct usb_audio20_cluster r;
4102 	const struct usb_descriptor *dp;
4103 	uint8_t i;
4104 
4105 	for (i = 0; i < UAUDIO_RECURSE_LIMIT; i++) {	/* avoid infinite loops */
4106 		dp = iot[id].u.desc;
4107 		if (dp == NULL)
4108 			goto error;
4109 
4110 		switch (dp->bDescriptorSubtype) {
4111 		case UDESCSUB_AC_INPUT:
4112 			r.bNrChannels = iot[id].u.it_v2->bNrChannels;
4113 			r.bmChannelConfig[0] = iot[id].u.it_v2->bmChannelConfig[0];
4114 			r.bmChannelConfig[1] = iot[id].u.it_v2->bmChannelConfig[1];
4115 			r.bmChannelConfig[2] = iot[id].u.it_v2->bmChannelConfig[2];
4116 			r.bmChannelConfig[3] = iot[id].u.it_v2->bmChannelConfig[3];
4117 			r.iChannelNames = iot[id].u.it_v2->iTerminal;
4118 			goto done;
4119 
4120 		case UDESCSUB_AC_OUTPUT:
4121 			id = iot[id].u.ot_v2->bSourceId;
4122 			break;
4123 
4124 		case UDESCSUB_AC_MIXER:
4125 			r = *(const struct usb_audio20_cluster *)
4126 			    &iot[id].u.mu_v2->baSourceId[
4127 			    iot[id].u.mu_v2->bNrInPins];
4128 			goto done;
4129 
4130 		case UDESCSUB_AC_SELECTOR:
4131 			if (iot[id].u.su_v2->bNrInPins > 0) {
4132 				/* XXX This is not really right */
4133 				id = iot[id].u.su_v2->baSourceId[0];
4134 			}
4135 			break;
4136 
4137 		case UDESCSUB_AC_SAMPLE_RT:
4138 			id = iot[id].u.ru_v2->bSourceId;
4139 			break;
4140 
4141 		case UDESCSUB_AC_EFFECT:
4142 			id = iot[id].u.ef_v2->bSourceId;
4143 			break;
4144 
4145 		case UDESCSUB_AC_FEATURE:
4146 			id = iot[id].u.fu_v2->bSourceId;
4147 			break;
4148 
4149 		case UDESCSUB_AC_PROCESSING_V2:
4150 			r = *((const struct usb_audio20_cluster *)
4151 			    &iot[id].u.pu_v2->baSourceId[
4152 			    iot[id].u.pu_v2->bNrInPins]);
4153 			goto done;
4154 
4155 		case UDESCSUB_AC_EXTENSION_V2:
4156 			r = *((const struct usb_audio20_cluster *)
4157 			    &iot[id].u.eu_v2->baSourceId[
4158 			    iot[id].u.eu_v2->bNrInPins]);
4159 			goto done;
4160 
4161 		default:
4162 			goto error;
4163 		}
4164 	}
4165 error:
4166 	DPRINTF("Bad data!\n");
4167 	memset(&r, 0, sizeof(r));
4168 done:
4169 	return (r);
4170 }
4171 
4172 static uint16_t
4173 uaudio_mixer_determine_class(const struct uaudio_terminal_node *iot,
4174     struct uaudio_mixer_node *mix)
4175 {
4176 	uint16_t terminal_type = 0x0000;
4177 	const struct uaudio_terminal_node *input[2];
4178 	const struct uaudio_terminal_node *output[2];
4179 
4180 	input[0] = uaudio_mixer_get_input(iot, 0);
4181 	input[1] = uaudio_mixer_get_input(iot, 1);
4182 
4183 	output[0] = uaudio_mixer_get_output(iot, 0);
4184 	output[1] = uaudio_mixer_get_output(iot, 1);
4185 
4186 	/*
4187 	 * check if there is only
4188 	 * one output terminal:
4189 	 */
4190 	if (output[0] && (!output[1])) {
4191 		terminal_type =
4192 		    UGETW(output[0]->u.ot_v1->wTerminalType);
4193 	}
4194 	/*
4195 	 * If the only output terminal is USB,
4196 	 * the class is UAC_RECORD.
4197 	 */
4198 	if ((terminal_type & 0xff00) == (UAT_UNDEFINED & 0xff00)) {
4199 
4200 		mix->class = UAC_RECORD;
4201 		if (input[0] && (!input[1])) {
4202 			terminal_type =
4203 			    UGETW(input[0]->u.it_v1->wTerminalType);
4204 		} else {
4205 			terminal_type = 0;
4206 		}
4207 		goto done;
4208 	}
4209 	/*
4210 	 * if the unit is connected to just
4211 	 * one input terminal, the
4212 	 * class is UAC_INPUT:
4213 	 */
4214 	if (input[0] && (!input[1])) {
4215 		mix->class = UAC_INPUT;
4216 		terminal_type =
4217 		    UGETW(input[0]->u.it_v1->wTerminalType);
4218 		goto done;
4219 	}
4220 	/*
4221 	 * Otherwise, the class is UAC_OUTPUT.
4222 	 */
4223 	mix->class = UAC_OUTPUT;
4224 done:
4225 	return (terminal_type);
4226 }
4227 
4228 static uint16_t
4229 uaudio20_mixer_determine_class(const struct uaudio_terminal_node *iot,
4230     struct uaudio_mixer_node *mix)
4231 {
4232 	uint16_t terminal_type = 0x0000;
4233 	const struct uaudio_terminal_node *input[2];
4234 	const struct uaudio_terminal_node *output[2];
4235 
4236 	input[0] = uaudio_mixer_get_input(iot, 0);
4237 	input[1] = uaudio_mixer_get_input(iot, 1);
4238 
4239 	output[0] = uaudio_mixer_get_output(iot, 0);
4240 	output[1] = uaudio_mixer_get_output(iot, 1);
4241 
4242 	/*
4243 	 * check if there is only
4244 	 * one output terminal:
4245 	 */
4246 	if (output[0] && (!output[1]))
4247 		terminal_type = UGETW(output[0]->u.ot_v2->wTerminalType);
4248 	/*
4249 	 * If the only output terminal is USB,
4250 	 * the class is UAC_RECORD.
4251 	 */
4252 	if ((terminal_type & 0xff00) == (UAT_UNDEFINED & 0xff00)) {
4253 
4254 		mix->class = UAC_RECORD;
4255 		if (input[0] && (!input[1])) {
4256 			terminal_type =
4257 			    UGETW(input[0]->u.it_v2->wTerminalType);
4258 		} else {
4259 			terminal_type = 0;
4260 		}
4261 		goto done;
4262 	}
4263 	/*
4264 	 * if the unit is connected to just
4265 	 * one input terminal, the
4266 	 * class is UAC_INPUT:
4267 	 */
4268 	if (input[0] && (!input[1])) {
4269 		mix->class = UAC_INPUT;
4270 		terminal_type =
4271 		    UGETW(input[0]->u.it_v2->wTerminalType);
4272 		goto done;
4273 	}
4274 	/*
4275 	 * Otherwise, the class is UAC_OUTPUT.
4276 	 */
4277 	mix->class = UAC_OUTPUT;
4278 done:
4279 	return (terminal_type);
4280 }
4281 
4282 struct uaudio_tt_to_feature {
4283 	uint16_t terminal_type;
4284 	uint16_t feature;
4285 };
4286 
4287 static const struct uaudio_tt_to_feature uaudio_tt_to_feature[] = {
4288 
4289 	{UAT_STREAM, SOUND_MIXER_PCM},
4290 
4291 	{UATI_MICROPHONE, SOUND_MIXER_MIC},
4292 	{UATI_DESKMICROPHONE, SOUND_MIXER_MIC},
4293 	{UATI_PERSONALMICROPHONE, SOUND_MIXER_MIC},
4294 	{UATI_OMNIMICROPHONE, SOUND_MIXER_MIC},
4295 	{UATI_MICROPHONEARRAY, SOUND_MIXER_MIC},
4296 	{UATI_PROCMICROPHONEARR, SOUND_MIXER_MIC},
4297 
4298 	{UATO_SPEAKER, SOUND_MIXER_SPEAKER},
4299 	{UATO_DESKTOPSPEAKER, SOUND_MIXER_SPEAKER},
4300 	{UATO_ROOMSPEAKER, SOUND_MIXER_SPEAKER},
4301 	{UATO_COMMSPEAKER, SOUND_MIXER_SPEAKER},
4302 
4303 	{UATE_ANALOGCONN, SOUND_MIXER_LINE},
4304 	{UATE_LINECONN, SOUND_MIXER_LINE},
4305 	{UATE_LEGACYCONN, SOUND_MIXER_LINE},
4306 
4307 	{UATE_DIGITALAUIFC, SOUND_MIXER_ALTPCM},
4308 	{UATE_SPDIF, SOUND_MIXER_ALTPCM},
4309 	{UATE_1394DA, SOUND_MIXER_ALTPCM},
4310 	{UATE_1394DV, SOUND_MIXER_ALTPCM},
4311 
4312 	{UATF_CDPLAYER, SOUND_MIXER_CD},
4313 
4314 	{UATF_SYNTHESIZER, SOUND_MIXER_SYNTH},
4315 
4316 	{UATF_VIDEODISCAUDIO, SOUND_MIXER_VIDEO},
4317 	{UATF_DVDAUDIO, SOUND_MIXER_VIDEO},
4318 	{UATF_TVTUNERAUDIO, SOUND_MIXER_VIDEO},
4319 
4320 	/* telephony terminal types */
4321 	{UATT_UNDEFINED, SOUND_MIXER_PHONEIN},	/* SOUND_MIXER_PHONEOUT */
4322 	{UATT_PHONELINE, SOUND_MIXER_PHONEIN},	/* SOUND_MIXER_PHONEOUT */
4323 	{UATT_TELEPHONE, SOUND_MIXER_PHONEIN},	/* SOUND_MIXER_PHONEOUT */
4324 	{UATT_DOWNLINEPHONE, SOUND_MIXER_PHONEIN},	/* SOUND_MIXER_PHONEOUT */
4325 
4326 	{UATF_RADIORECV, SOUND_MIXER_RADIO},
4327 	{UATF_RADIOXMIT, SOUND_MIXER_RADIO},
4328 
4329 	{UAT_UNDEFINED, SOUND_MIXER_VOLUME},
4330 	{UAT_VENDOR, SOUND_MIXER_VOLUME},
4331 	{UATI_UNDEFINED, SOUND_MIXER_VOLUME},
4332 
4333 	/* output terminal types */
4334 	{UATO_UNDEFINED, SOUND_MIXER_VOLUME},
4335 	{UATO_DISPLAYAUDIO, SOUND_MIXER_VOLUME},
4336 	{UATO_SUBWOOFER, SOUND_MIXER_VOLUME},
4337 	{UATO_HEADPHONES, SOUND_MIXER_VOLUME},
4338 
4339 	/* bidir terminal types */
4340 	{UATB_UNDEFINED, SOUND_MIXER_VOLUME},
4341 	{UATB_HANDSET, SOUND_MIXER_VOLUME},
4342 	{UATB_HEADSET, SOUND_MIXER_VOLUME},
4343 	{UATB_SPEAKERPHONE, SOUND_MIXER_VOLUME},
4344 	{UATB_SPEAKERPHONEESUP, SOUND_MIXER_VOLUME},
4345 	{UATB_SPEAKERPHONEECANC, SOUND_MIXER_VOLUME},
4346 
4347 	/* external terminal types */
4348 	{UATE_UNDEFINED, SOUND_MIXER_VOLUME},
4349 
4350 	/* embedded function terminal types */
4351 	{UATF_UNDEFINED, SOUND_MIXER_VOLUME},
4352 	{UATF_CALIBNOISE, SOUND_MIXER_VOLUME},
4353 	{UATF_EQUNOISE, SOUND_MIXER_VOLUME},
4354 	{UATF_DAT, SOUND_MIXER_VOLUME},
4355 	{UATF_DCC, SOUND_MIXER_VOLUME},
4356 	{UATF_MINIDISK, SOUND_MIXER_VOLUME},
4357 	{UATF_ANALOGTAPE, SOUND_MIXER_VOLUME},
4358 	{UATF_PHONOGRAPH, SOUND_MIXER_VOLUME},
4359 	{UATF_VCRAUDIO, SOUND_MIXER_VOLUME},
4360 	{UATF_SATELLITE, SOUND_MIXER_VOLUME},
4361 	{UATF_CABLETUNER, SOUND_MIXER_VOLUME},
4362 	{UATF_DSS, SOUND_MIXER_VOLUME},
4363 	{UATF_MULTITRACK, SOUND_MIXER_VOLUME},
4364 	{0xffff, SOUND_MIXER_VOLUME},
4365 
4366 	/* default */
4367 	{0x0000, SOUND_MIXER_VOLUME},
4368 };
4369 
4370 static uint16_t
4371 uaudio_mixer_feature_name(const struct uaudio_terminal_node *iot,
4372     struct uaudio_mixer_node *mix)
4373 {
4374 	const struct uaudio_tt_to_feature *uat = uaudio_tt_to_feature;
4375 	uint16_t terminal_type = uaudio_mixer_determine_class(iot, mix);
4376 
4377 	if ((mix->class == UAC_RECORD) && (terminal_type == 0)) {
4378 		return (SOUND_MIXER_IMIX);
4379 	}
4380 	while (uat->terminal_type) {
4381 		if (uat->terminal_type == terminal_type) {
4382 			break;
4383 		}
4384 		uat++;
4385 	}
4386 
4387 	DPRINTF("terminal_type=0x%04x -> %d\n",
4388 	    terminal_type, uat->feature);
4389 
4390 	return (uat->feature);
4391 }
4392 
4393 static uint16_t
4394 uaudio20_mixer_feature_name(const struct uaudio_terminal_node *iot,
4395     struct uaudio_mixer_node *mix)
4396 {
4397 	const struct uaudio_tt_to_feature *uat;
4398 	uint16_t terminal_type = uaudio20_mixer_determine_class(iot, mix);
4399 
4400 	if ((mix->class == UAC_RECORD) && (terminal_type == 0))
4401 		return (SOUND_MIXER_IMIX);
4402 
4403 	for (uat = uaudio_tt_to_feature; uat->terminal_type != 0; uat++) {
4404 		if (uat->terminal_type == terminal_type)
4405 			break;
4406 	}
4407 
4408 	DPRINTF("terminal_type=0x%04x -> %d\n",
4409 	    terminal_type, uat->feature);
4410 
4411 	return (uat->feature);
4412 }
4413 
4414 static const struct uaudio_terminal_node *
4415 uaudio_mixer_get_input(const struct uaudio_terminal_node *iot, uint8_t i)
4416 {
4417 	struct uaudio_terminal_node *root = iot->root;
4418 	uint8_t n;
4419 
4420 	n = iot->usr.id_max;
4421 	do {
4422 		if (iot->usr.bit_input[n / 8] & (1 << (n % 8))) {
4423 			if (!i--)
4424 				return (root + n);
4425 		}
4426 	} while (n--);
4427 
4428 	return (NULL);
4429 }
4430 
4431 static const struct uaudio_terminal_node *
4432 uaudio_mixer_get_output(const struct uaudio_terminal_node *iot, uint8_t i)
4433 {
4434 	struct uaudio_terminal_node *root = iot->root;
4435 	uint8_t n;
4436 
4437 	n = iot->usr.id_max;
4438 	do {
4439 		if (iot->usr.bit_output[n / 8] & (1 << (n % 8))) {
4440 			if (!i--)
4441 				return (root + n);
4442 		}
4443 	} while (n--);
4444 
4445 	return (NULL);
4446 }
4447 
4448 static void
4449 uaudio_mixer_find_inputs_sub(struct uaudio_terminal_node *root,
4450     const uint8_t *p_id, uint8_t n_id,
4451     struct uaudio_search_result *info)
4452 {
4453 	struct uaudio_terminal_node *iot;
4454 	uint8_t n;
4455 	uint8_t i;
4456 	uint8_t is_last;
4457 
4458 top:
4459 	for (n = 0; n < n_id; n++) {
4460 
4461 		i = p_id[n];
4462 
4463 		if (info->recurse_level == UAUDIO_RECURSE_LIMIT) {
4464 			DPRINTF("avoided going into a circle at id=%d!\n", i);
4465 			return;
4466 		}
4467 
4468 		info->recurse_level++;
4469 
4470 		iot = (root + i);
4471 
4472 		if (iot->u.desc == NULL)
4473 			continue;
4474 
4475 		is_last = ((n + 1) == n_id);
4476 
4477 		switch (iot->u.desc->bDescriptorSubtype) {
4478 		case UDESCSUB_AC_INPUT:
4479 			info->bit_input[i / 8] |= (1 << (i % 8));
4480 			break;
4481 
4482 		case UDESCSUB_AC_FEATURE:
4483 			if (is_last) {
4484 				p_id = &iot->u.fu_v1->bSourceId;
4485 				n_id = 1;
4486 				goto top;
4487 			}
4488 			uaudio_mixer_find_inputs_sub(
4489 			    root, &iot->u.fu_v1->bSourceId, 1, info);
4490 			break;
4491 
4492 		case UDESCSUB_AC_OUTPUT:
4493 			if (is_last) {
4494 				p_id = &iot->u.ot_v1->bSourceId;
4495 				n_id = 1;
4496 				goto top;
4497 			}
4498 			uaudio_mixer_find_inputs_sub(
4499 			    root, &iot->u.ot_v1->bSourceId, 1, info);
4500 			break;
4501 
4502 		case UDESCSUB_AC_MIXER:
4503 			if (is_last) {
4504 				p_id = iot->u.mu_v1->baSourceId;
4505 				n_id = iot->u.mu_v1->bNrInPins;
4506 				goto top;
4507 			}
4508 			uaudio_mixer_find_inputs_sub(
4509 			    root, iot->u.mu_v1->baSourceId,
4510 			    iot->u.mu_v1->bNrInPins, info);
4511 			break;
4512 
4513 		case UDESCSUB_AC_SELECTOR:
4514 			if (is_last) {
4515 				p_id = iot->u.su_v1->baSourceId;
4516 				n_id = iot->u.su_v1->bNrInPins;
4517 				goto top;
4518 			}
4519 			uaudio_mixer_find_inputs_sub(
4520 			    root, iot->u.su_v1->baSourceId,
4521 			    iot->u.su_v1->bNrInPins, info);
4522 			break;
4523 
4524 		case UDESCSUB_AC_PROCESSING:
4525 			if (is_last) {
4526 				p_id = iot->u.pu_v1->baSourceId;
4527 				n_id = iot->u.pu_v1->bNrInPins;
4528 				goto top;
4529 			}
4530 			uaudio_mixer_find_inputs_sub(
4531 			    root, iot->u.pu_v1->baSourceId,
4532 			    iot->u.pu_v1->bNrInPins, info);
4533 			break;
4534 
4535 		case UDESCSUB_AC_EXTENSION:
4536 			if (is_last) {
4537 				p_id = iot->u.eu_v1->baSourceId;
4538 				n_id = iot->u.eu_v1->bNrInPins;
4539 				goto top;
4540 			}
4541 			uaudio_mixer_find_inputs_sub(
4542 			    root, iot->u.eu_v1->baSourceId,
4543 			    iot->u.eu_v1->bNrInPins, info);
4544 			break;
4545 
4546 		default:
4547 			break;
4548 		}
4549 	}
4550 }
4551 
4552 static void
4553 uaudio20_mixer_find_inputs_sub(struct uaudio_terminal_node *root,
4554     const uint8_t *p_id, uint8_t n_id,
4555     struct uaudio_search_result *info)
4556 {
4557 	struct uaudio_terminal_node *iot;
4558 	uint8_t n;
4559 	uint8_t i;
4560 	uint8_t is_last;
4561 
4562 top:
4563 	for (n = 0; n < n_id; n++) {
4564 
4565 		i = p_id[n];
4566 
4567 		if (info->recurse_level == UAUDIO_RECURSE_LIMIT) {
4568 			DPRINTF("avoided going into a circle at id=%d!\n", i);
4569 			return;
4570 		}
4571 
4572 		info->recurse_level++;
4573 
4574 		iot = (root + i);
4575 
4576 		if (iot->u.desc == NULL)
4577 			continue;
4578 
4579 		is_last = ((n + 1) == n_id);
4580 
4581 		switch (iot->u.desc->bDescriptorSubtype) {
4582 		case UDESCSUB_AC_INPUT:
4583 			info->bit_input[i / 8] |= (1 << (i % 8));
4584 			break;
4585 
4586 		case UDESCSUB_AC_OUTPUT:
4587 			if (is_last) {
4588 				p_id = &iot->u.ot_v2->bSourceId;
4589 				n_id = 1;
4590 				goto top;
4591 			}
4592 			uaudio20_mixer_find_inputs_sub(
4593 			    root, &iot->u.ot_v2->bSourceId, 1, info);
4594 			break;
4595 
4596 		case UDESCSUB_AC_MIXER:
4597 			if (is_last) {
4598 				p_id = iot->u.mu_v2->baSourceId;
4599 				n_id = iot->u.mu_v2->bNrInPins;
4600 				goto top;
4601 			}
4602 			uaudio20_mixer_find_inputs_sub(
4603 			    root, iot->u.mu_v2->baSourceId,
4604 			    iot->u.mu_v2->bNrInPins, info);
4605 			break;
4606 
4607 		case UDESCSUB_AC_SELECTOR:
4608 			if (is_last) {
4609 				p_id = iot->u.su_v2->baSourceId;
4610 				n_id = iot->u.su_v2->bNrInPins;
4611 				goto top;
4612 			}
4613 			uaudio20_mixer_find_inputs_sub(
4614 			    root, iot->u.su_v2->baSourceId,
4615 			    iot->u.su_v2->bNrInPins, info);
4616 			break;
4617 
4618 		case UDESCSUB_AC_SAMPLE_RT:
4619 			if (is_last) {
4620 				p_id = &iot->u.ru_v2->bSourceId;
4621 				n_id = 1;
4622 				goto top;
4623 			}
4624 			uaudio20_mixer_find_inputs_sub(
4625 			    root, &iot->u.ru_v2->bSourceId,
4626 			    1, info);
4627 			break;
4628 
4629 		case UDESCSUB_AC_EFFECT:
4630 			if (is_last) {
4631 				p_id = &iot->u.ef_v2->bSourceId;
4632 				n_id = 1;
4633 				goto top;
4634 			}
4635 			uaudio20_mixer_find_inputs_sub(
4636 			    root, &iot->u.ef_v2->bSourceId,
4637 			    1, info);
4638 			break;
4639 
4640 		case UDESCSUB_AC_FEATURE:
4641 			if (is_last) {
4642 				p_id = &iot->u.fu_v2->bSourceId;
4643 				n_id = 1;
4644 				goto top;
4645 			}
4646 			uaudio20_mixer_find_inputs_sub(
4647 			    root, &iot->u.fu_v2->bSourceId, 1, info);
4648 			break;
4649 
4650 		case UDESCSUB_AC_PROCESSING_V2:
4651 			if (is_last) {
4652 				p_id = iot->u.pu_v2->baSourceId;
4653 				n_id = iot->u.pu_v2->bNrInPins;
4654 				goto top;
4655 			}
4656 			uaudio20_mixer_find_inputs_sub(
4657 			    root, iot->u.pu_v2->baSourceId,
4658 			    iot->u.pu_v2->bNrInPins, info);
4659 			break;
4660 
4661 		case UDESCSUB_AC_EXTENSION_V2:
4662 			if (is_last) {
4663 				p_id = iot->u.eu_v2->baSourceId;
4664 				n_id = iot->u.eu_v2->bNrInPins;
4665 				goto top;
4666 			}
4667 			uaudio20_mixer_find_inputs_sub(
4668 			    root, iot->u.eu_v2->baSourceId,
4669 			    iot->u.eu_v2->bNrInPins, info);
4670 			break;
4671 		default:
4672 			break;
4673 		}
4674 	}
4675 }
4676 
4677 static void
4678 uaudio20_mixer_find_clocks_sub(struct uaudio_terminal_node *root,
4679     const uint8_t *p_id, uint8_t n_id,
4680     struct uaudio_search_result *info)
4681 {
4682 	struct uaudio_terminal_node *iot;
4683 	uint8_t n;
4684 	uint8_t i;
4685 	uint8_t is_last;
4686 	uint8_t id;
4687 
4688 top:
4689 	for (n = 0; n < n_id; n++) {
4690 
4691 		i = p_id[n];
4692 
4693 		if (info->recurse_level == UAUDIO_RECURSE_LIMIT) {
4694 			DPRINTF("avoided going into a circle at id=%d!\n", i);
4695 			return;
4696 		}
4697 
4698 		info->recurse_level++;
4699 
4700 		iot = (root + i);
4701 
4702 		if (iot->u.desc == NULL)
4703 			continue;
4704 
4705 		is_last = ((n + 1) == n_id);
4706 
4707 		switch (iot->u.desc->bDescriptorSubtype) {
4708 		case UDESCSUB_AC_INPUT:
4709 			info->is_input = 1;
4710 			if (is_last) {
4711 				p_id = &iot->u.it_v2->bCSourceId;
4712 				n_id = 1;
4713 				goto top;
4714 			}
4715 			uaudio20_mixer_find_clocks_sub(root,
4716 			    &iot->u.it_v2->bCSourceId, 1, info);
4717 			break;
4718 
4719 		case UDESCSUB_AC_OUTPUT:
4720 			info->is_input = 0;
4721 			if (is_last) {
4722 				p_id = &iot->u.ot_v2->bCSourceId;
4723 				n_id = 1;
4724 				goto top;
4725 			}
4726 			uaudio20_mixer_find_clocks_sub(root,
4727 			    &iot->u.ot_v2->bCSourceId, 1, info);
4728 			break;
4729 
4730 		case UDESCSUB_AC_CLOCK_SEL:
4731 			if (is_last) {
4732 				p_id = iot->u.csel_v2->baCSourceId;
4733 				n_id = iot->u.csel_v2->bNrInPins;
4734 				goto top;
4735 			}
4736 			uaudio20_mixer_find_clocks_sub(root,
4737 			    iot->u.csel_v2->baCSourceId,
4738 			    iot->u.csel_v2->bNrInPins, info);
4739 			break;
4740 
4741 		case UDESCSUB_AC_CLOCK_MUL:
4742 			if (is_last) {
4743 				p_id = &iot->u.cmul_v2->bCSourceId;
4744 				n_id = 1;
4745 				goto top;
4746 			}
4747 			uaudio20_mixer_find_clocks_sub(root,
4748 			    &iot->u.cmul_v2->bCSourceId,
4749 			    1, info);
4750 			break;
4751 
4752 		case UDESCSUB_AC_CLOCK_SRC:
4753 
4754 			id = iot->u.csrc_v2->bClockId;
4755 
4756 			switch (info->is_input) {
4757 			case 0:
4758 				info->bit_output[id / 8] |= (1 << (id % 8));
4759 				break;
4760 			case 1:
4761 				info->bit_input[id / 8] |= (1 << (id % 8));
4762 				break;
4763 			default:
4764 				break;
4765 			}
4766 			break;
4767 
4768 		default:
4769 			break;
4770 		}
4771 	}
4772 }
4773 
4774 static void
4775 uaudio_mixer_find_outputs_sub(struct uaudio_terminal_node *root, uint8_t id,
4776     uint8_t n_id, struct uaudio_search_result *info)
4777 {
4778 	struct uaudio_terminal_node *iot = (root + id);
4779 	uint8_t j;
4780 
4781 	j = n_id;
4782 	do {
4783 		if ((j != id) && ((root + j)->u.desc) &&
4784 		    ((root + j)->u.desc->bDescriptorSubtype == UDESCSUB_AC_OUTPUT)) {
4785 
4786 			/*
4787 			 * "j" (output) <--- virtual wire <--- "id" (input)
4788 			 *
4789 			 * if "j" has "id" on the input, then "id" have "j" on
4790 			 * the output, because they are connected:
4791 			 */
4792 			if ((root + j)->usr.bit_input[id / 8] & (1 << (id % 8))) {
4793 				iot->usr.bit_output[j / 8] |= (1 << (j % 8));
4794 			}
4795 		}
4796 	} while (j--);
4797 }
4798 
4799 static void
4800 uaudio_mixer_fill_info(struct uaudio_softc *sc,
4801     struct usb_device *udev, void *desc)
4802 {
4803 	const struct usb_audio_control_descriptor *acdp;
4804 	struct usb_config_descriptor *cd = usbd_get_config_descriptor(udev);
4805 	const struct usb_descriptor *dp;
4806 	const struct usb_audio_unit *au;
4807 	struct uaudio_terminal_node *iot = NULL;
4808 	uint16_t wTotalLen;
4809 	uint8_t ID_max = 0;		/* inclusive */
4810 	uint8_t i;
4811 
4812 	desc = usb_desc_foreach(cd, desc);
4813 
4814 	if (desc == NULL) {
4815 		DPRINTF("no Audio Control header\n");
4816 		goto done;
4817 	}
4818 	acdp = desc;
4819 
4820 	if ((acdp->bLength < sizeof(*acdp)) ||
4821 	    (acdp->bDescriptorType != UDESC_CS_INTERFACE) ||
4822 	    (acdp->bDescriptorSubtype != UDESCSUB_AC_HEADER)) {
4823 		DPRINTF("invalid Audio Control header\n");
4824 		goto done;
4825 	}
4826 	/* "wTotalLen" is allowed to be corrupt */
4827 	wTotalLen = UGETW(acdp->wTotalLength) - acdp->bLength;
4828 
4829 	/* get USB audio revision */
4830 	sc->sc_audio_rev = UGETW(acdp->bcdADC);
4831 
4832 	DPRINTFN(3, "found AC header, vers=%03x, len=%d\n",
4833 	    sc->sc_audio_rev, wTotalLen);
4834 
4835 	iot = malloc(sizeof(struct uaudio_terminal_node) * 256, M_TEMP,
4836 	    M_WAITOK | M_ZERO);
4837 
4838 	if (iot == NULL) {
4839 		DPRINTF("no memory!\n");
4840 		goto done;
4841 	}
4842 	while ((desc = usb_desc_foreach(cd, desc))) {
4843 
4844 		dp = desc;
4845 
4846 		if (dp->bLength > wTotalLen) {
4847 			break;
4848 		} else {
4849 			wTotalLen -= dp->bLength;
4850 		}
4851 
4852 		if (sc->sc_audio_rev >= UAUDIO_VERSION_30)
4853 			au = NULL;
4854 		else if (sc->sc_audio_rev >= UAUDIO_VERSION_20)
4855 			au = uaudio20_mixer_verify_desc(dp, 0);
4856 		else
4857 			au = uaudio_mixer_verify_desc(dp, 0);
4858 
4859 		if (au) {
4860 			iot[au->bUnitId].u.desc = (const void *)au;
4861 			if (au->bUnitId > ID_max)
4862 				ID_max = au->bUnitId;
4863 		}
4864 	}
4865 
4866 	DPRINTF("Maximum ID=%d\n", ID_max);
4867 
4868 	/*
4869 	 * determine sourcing inputs for
4870 	 * all nodes in the tree:
4871 	 */
4872 	i = ID_max;
4873 	do {
4874 		if (sc->sc_audio_rev >= UAUDIO_VERSION_30) {
4875 			/* FALLTHROUGH */
4876 		} else if (sc->sc_audio_rev >= UAUDIO_VERSION_20) {
4877 			uaudio20_mixer_find_inputs_sub(iot,
4878 			    &i, 1, &((iot + i)->usr));
4879 
4880 			sc->sc_mixer_clocks.is_input = 255;
4881 			sc->sc_mixer_clocks.recurse_level = 0;
4882 
4883 			uaudio20_mixer_find_clocks_sub(iot,
4884 			    &i, 1, &sc->sc_mixer_clocks);
4885 		} else {
4886 			uaudio_mixer_find_inputs_sub(iot,
4887 			    &i, 1, &((iot + i)->usr));
4888 		}
4889 	} while (i--);
4890 
4891 	/*
4892 	 * determine outputs for
4893 	 * all nodes in the tree:
4894 	 */
4895 	i = ID_max;
4896 	do {
4897 		uaudio_mixer_find_outputs_sub(iot,
4898 		    i, ID_max, &((iot + i)->usr));
4899 	} while (i--);
4900 
4901 	/* set "id_max" and "root" */
4902 
4903 	i = ID_max;
4904 	do {
4905 		(iot + i)->usr.id_max = ID_max;
4906 		(iot + i)->root = iot;
4907 	} while (i--);
4908 
4909 	/*
4910 	 * Scan the config to create a linked list of "mixer" nodes:
4911 	 */
4912 
4913 	i = ID_max;
4914 	do {
4915 		dp = iot[i].u.desc;
4916 
4917 		if (dp == NULL)
4918 			continue;
4919 
4920 		DPRINTFN(11, "id=%d subtype=%d\n",
4921 		    i, dp->bDescriptorSubtype);
4922 
4923 		if (sc->sc_audio_rev >= UAUDIO_VERSION_30) {
4924 			continue;
4925 		} else if (sc->sc_audio_rev >= UAUDIO_VERSION_20) {
4926 
4927 			switch (dp->bDescriptorSubtype) {
4928 			case UDESCSUB_AC_HEADER:
4929 				DPRINTF("unexpected AC header\n");
4930 				break;
4931 
4932 			case UDESCSUB_AC_INPUT:
4933 			case UDESCSUB_AC_OUTPUT:
4934 			case UDESCSUB_AC_PROCESSING_V2:
4935 			case UDESCSUB_AC_EXTENSION_V2:
4936 			case UDESCSUB_AC_EFFECT:
4937 			case UDESCSUB_AC_CLOCK_SRC:
4938 			case UDESCSUB_AC_CLOCK_SEL:
4939 			case UDESCSUB_AC_CLOCK_MUL:
4940 			case UDESCSUB_AC_SAMPLE_RT:
4941 				break;
4942 
4943 			case UDESCSUB_AC_MIXER:
4944 				uaudio20_mixer_add_mixer(sc, iot, i);
4945 				break;
4946 
4947 			case UDESCSUB_AC_SELECTOR:
4948 				uaudio20_mixer_add_selector(sc, iot, i);
4949 				break;
4950 
4951 			case UDESCSUB_AC_FEATURE:
4952 				uaudio20_mixer_add_feature(sc, iot, i);
4953 				break;
4954 
4955 			default:
4956 				DPRINTF("bad AC desc subtype=0x%02x\n",
4957 				    dp->bDescriptorSubtype);
4958 				break;
4959 			}
4960 			continue;
4961 		}
4962 
4963 		switch (dp->bDescriptorSubtype) {
4964 		case UDESCSUB_AC_HEADER:
4965 			DPRINTF("unexpected AC header\n");
4966 			break;
4967 
4968 		case UDESCSUB_AC_INPUT:
4969 		case UDESCSUB_AC_OUTPUT:
4970 			break;
4971 
4972 		case UDESCSUB_AC_MIXER:
4973 			uaudio_mixer_add_mixer(sc, iot, i);
4974 			break;
4975 
4976 		case UDESCSUB_AC_SELECTOR:
4977 			uaudio_mixer_add_selector(sc, iot, i);
4978 			break;
4979 
4980 		case UDESCSUB_AC_FEATURE:
4981 			uaudio_mixer_add_feature(sc, iot, i);
4982 			break;
4983 
4984 		case UDESCSUB_AC_PROCESSING:
4985 			uaudio_mixer_add_processing(sc, iot, i);
4986 			break;
4987 
4988 		case UDESCSUB_AC_EXTENSION:
4989 			uaudio_mixer_add_extension(sc, iot, i);
4990 			break;
4991 
4992 		default:
4993 			DPRINTF("bad AC desc subtype=0x%02x\n",
4994 			    dp->bDescriptorSubtype);
4995 			break;
4996 		}
4997 
4998 	} while (i--);
4999 
5000 done:
5001 	free(iot, M_TEMP);
5002 }
5003 
5004 static int
5005 uaudio_mixer_get(struct usb_device *udev, uint16_t audio_rev,
5006     uint8_t what, struct uaudio_mixer_node *mc)
5007 {
5008 	struct usb_device_request req;
5009 	int val;
5010 	uint8_t data[2 + (2 * 3)];
5011 	usb_error_t err;
5012 
5013 	if (mc->wValue[0] == -1)
5014 		return (0);
5015 
5016 	if (audio_rev >= UAUDIO_VERSION_30)
5017 		return (0);
5018 	else if (audio_rev >= UAUDIO_VERSION_20) {
5019 		if (what == GET_CUR) {
5020 			req.bRequest = UA20_CS_CUR;
5021 			USETW(req.wLength, 2);
5022 		} else {
5023 			req.bRequest = UA20_CS_RANGE;
5024 			USETW(req.wLength, 8);
5025 		}
5026 	} else {
5027 		uint16_t len = MIX_SIZE(mc->type);
5028 
5029 		req.bRequest = what;
5030 		USETW(req.wLength, len);
5031 	}
5032 
5033 	req.bmRequestType = UT_READ_CLASS_INTERFACE;
5034 	USETW(req.wValue, mc->wValue[0]);
5035 	USETW(req.wIndex, mc->wIndex);
5036 
5037 	memset(data, 0, sizeof(data));
5038 
5039 	err = usbd_do_request(udev, NULL, &req, data);
5040 	if (err) {
5041 		DPRINTF("err=%s\n", usbd_errstr(err));
5042 		return (0);
5043 	}
5044 
5045 	if (audio_rev >= UAUDIO_VERSION_30) {
5046 		val = 0;
5047 	} else if (audio_rev >= UAUDIO_VERSION_20) {
5048 		switch (what) {
5049 		case GET_CUR:
5050 			val = (data[0] | (data[1] << 8));
5051 			break;
5052 		case GET_MIN:
5053 			val = (data[2] | (data[3] << 8));
5054 			break;
5055 		case GET_MAX:
5056 			val = (data[4] | (data[5] << 8));
5057 			break;
5058 		case GET_RES:
5059 			val = (data[6] | (data[7] << 8));
5060 			break;
5061 		default:
5062 			val = 0;
5063 			break;
5064 		}
5065 	} else {
5066 		val = (data[0] | (data[1] << 8));
5067 	}
5068 
5069 	if (what == GET_CUR || what == GET_MIN || what == GET_MAX)
5070 		val = uaudio_mixer_signext(mc->type, val);
5071 
5072 	DPRINTFN(3, "val=%d\n", val);
5073 
5074 	return (val);
5075 }
5076 
5077 static void
5078 uaudio_mixer_write_cfg_callback(struct usb_xfer *xfer, usb_error_t error)
5079 {
5080 	struct usb_device_request req;
5081 	struct uaudio_softc *sc = usbd_xfer_softc(xfer);
5082 	struct uaudio_mixer_node *mc = sc->sc_mixer_curr;
5083 	struct usb_page_cache *pc;
5084 	uint16_t len;
5085 	uint8_t repeat = 1;
5086 	uint8_t update;
5087 	uint8_t chan;
5088 	uint8_t buf[2];
5089 
5090 	DPRINTF("\n");
5091 
5092 	switch (USB_GET_STATE(xfer)) {
5093 	case USB_ST_TRANSFERRED:
5094 tr_transferred:
5095 	case USB_ST_SETUP:
5096 tr_setup:
5097 
5098 		if (mc == NULL) {
5099 			mc = sc->sc_mixer_root;
5100 			sc->sc_mixer_curr = mc;
5101 			sc->sc_mixer_chan = 0;
5102 			repeat = 0;
5103 		}
5104 		while (mc) {
5105 			while (sc->sc_mixer_chan < mc->nchan) {
5106 
5107 				chan = sc->sc_mixer_chan;
5108 
5109 				sc->sc_mixer_chan++;
5110 
5111 				update = ((mc->update[chan / 8] & (1 << (chan % 8))) &&
5112 				    (mc->wValue[chan] != -1));
5113 
5114 				mc->update[chan / 8] &= ~(1 << (chan % 8));
5115 
5116 				if (update) {
5117 
5118 					req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
5119 					USETW(req.wValue, mc->wValue[chan]);
5120 					USETW(req.wIndex, mc->wIndex);
5121 
5122 					if (sc->sc_audio_rev >= UAUDIO_VERSION_30) {
5123 						return;
5124 					} else if (sc->sc_audio_rev >= UAUDIO_VERSION_20) {
5125 						len = 2;
5126 						req.bRequest = UA20_CS_CUR;
5127 						USETW(req.wLength, len);
5128 					} else {
5129 						len = MIX_SIZE(mc->type);
5130 						req.bRequest = SET_CUR;
5131 						USETW(req.wLength, len);
5132 					}
5133 
5134 					buf[0] = (mc->wData[chan] & 0xFF);
5135 					buf[1] = (mc->wData[chan] >> 8) & 0xFF;
5136 
5137 					pc = usbd_xfer_get_frame(xfer, 0);
5138 					usbd_copy_in(pc, 0, &req, sizeof(req));
5139 					pc = usbd_xfer_get_frame(xfer, 1);
5140 					usbd_copy_in(pc, 0, buf, len);
5141 
5142 					usbd_xfer_set_frame_len(xfer, 0, sizeof(req));
5143 					usbd_xfer_set_frame_len(xfer, 1, len);
5144 					usbd_xfer_set_frames(xfer, len ? 2 : 1);
5145 					usbd_transfer_submit(xfer);
5146 					return;
5147 				}
5148 			}
5149 
5150 			mc = mc->next;
5151 			sc->sc_mixer_curr = mc;
5152 			sc->sc_mixer_chan = 0;
5153 		}
5154 
5155 		if (repeat) {
5156 			goto tr_setup;
5157 		}
5158 		break;
5159 
5160 	default:			/* Error */
5161 		DPRINTF("error=%s\n", usbd_errstr(error));
5162 		if (error == USB_ERR_CANCELLED) {
5163 			/* do nothing - we are detaching */
5164 			break;
5165 		}
5166 		goto tr_transferred;
5167 	}
5168 }
5169 
5170 static usb_error_t
5171 uaudio_set_speed(struct usb_device *udev, uint8_t endpt, uint32_t speed)
5172 {
5173 	struct usb_device_request req;
5174 	uint8_t data[3];
5175 
5176 	DPRINTFN(6, "endpt=%d speed=%u\n", endpt, speed);
5177 
5178 	req.bmRequestType = UT_WRITE_CLASS_ENDPOINT;
5179 	req.bRequest = SET_CUR;
5180 	USETW2(req.wValue, SAMPLING_FREQ_CONTROL, 0);
5181 	USETW(req.wIndex, endpt);
5182 	USETW(req.wLength, 3);
5183 	data[0] = speed;
5184 	data[1] = speed >> 8;
5185 	data[2] = speed >> 16;
5186 
5187 	return (usbd_do_request(udev, NULL, &req, data));
5188 }
5189 
5190 static usb_error_t
5191 uaudio20_set_speed(struct usb_device *udev, uint8_t iface_no,
5192     uint8_t clockid, uint32_t speed)
5193 {
5194 	struct usb_device_request req;
5195 	uint8_t data[4];
5196 
5197 	DPRINTFN(6, "ifaceno=%d clockid=%d speed=%u\n",
5198 	    iface_no, clockid, speed);
5199 
5200 	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
5201 	req.bRequest = UA20_CS_CUR;
5202 	USETW2(req.wValue, UA20_CS_SAM_FREQ_CONTROL, 0);
5203 	USETW2(req.wIndex, clockid, iface_no);
5204 	USETW(req.wLength, 4);
5205 	data[0] = speed;
5206 	data[1] = speed >> 8;
5207 	data[2] = speed >> 16;
5208 	data[3] = speed >> 24;
5209 
5210 	return (usbd_do_request(udev, NULL, &req, data));
5211 }
5212 
5213 static int
5214 uaudio_mixer_signext(uint8_t type, int val)
5215 {
5216 	if (!MIX_UNSIGNED(type)) {
5217 		if (MIX_SIZE(type) == 2) {
5218 			val = (int16_t)val;
5219 		} else {
5220 			val = (int8_t)val;
5221 		}
5222 	}
5223 	return (val);
5224 }
5225 
5226 static int
5227 uaudio_mixer_bsd2value(struct uaudio_mixer_node *mc, int32_t val)
5228 {
5229 	if (mc->type == MIX_ON_OFF) {
5230 		val = (val != 0);
5231 	} else if (mc->type == MIX_SELECTOR) {
5232 		if ((val < mc->minval) ||
5233 		    (val > mc->maxval)) {
5234 			val = mc->minval;
5235 		}
5236 	} else {
5237 
5238 		/* compute actual volume */
5239 		val = (val * mc->mul) / 255;
5240 
5241 		/* add lower offset */
5242 		val = val + mc->minval;
5243 
5244 		/* make sure we don't write a value out of range */
5245 		if (val > mc->maxval)
5246 			val = mc->maxval;
5247 		else if (val < mc->minval)
5248 			val = mc->minval;
5249 	}
5250 
5251 	DPRINTFN(6, "type=0x%03x val=%d min=%d max=%d val=%d\n",
5252 	    mc->type, val, mc->minval, mc->maxval, val);
5253 	return (val);
5254 }
5255 
5256 static void
5257 uaudio_mixer_ctl_set(struct uaudio_softc *sc, struct uaudio_mixer_node *mc,
5258     uint8_t chan, int32_t val)
5259 {
5260 	val = uaudio_mixer_bsd2value(mc, val);
5261 
5262 	mc->update[chan / 8] |= (1 << (chan % 8));
5263 	mc->wData[chan] = val;
5264 
5265 	/* start the transfer, if not already started */
5266 
5267 	usbd_transfer_start(sc->sc_mixer_xfer[0]);
5268 }
5269 
5270 static void
5271 uaudio_mixer_init(struct uaudio_softc *sc)
5272 {
5273 	struct uaudio_mixer_node *mc;
5274 	int32_t i;
5275 
5276 	for (mc = sc->sc_mixer_root; mc;
5277 	    mc = mc->next) {
5278 
5279 		if (mc->ctl != SOUND_MIXER_NRDEVICES) {
5280 			/*
5281 			 * Set device mask bits. See
5282 			 * /usr/include/machine/soundcard.h
5283 			 */
5284 			sc->sc_mix_info |= (1 << mc->ctl);
5285 		}
5286 		if ((mc->ctl == SOUND_MIXER_NRDEVICES) &&
5287 		    (mc->type == MIX_SELECTOR)) {
5288 
5289 			for (i = mc->minval; (i > 0) && (i <= mc->maxval); i++) {
5290 				if (mc->slctrtype[i - 1] == SOUND_MIXER_NRDEVICES) {
5291 					continue;
5292 				}
5293 				sc->sc_recsrc_info |= 1 << mc->slctrtype[i - 1];
5294 			}
5295 		}
5296 	}
5297 }
5298 
5299 int
5300 uaudio_mixer_init_sub(struct uaudio_softc *sc, struct snd_mixer *m)
5301 {
5302 	DPRINTF("\n");
5303 
5304 	sc->sc_mixer_lock = mixer_get_lock(m);
5305 	sc->sc_mixer_dev = m;
5306 
5307 	if (usbd_transfer_setup(sc->sc_udev, &sc->sc_mixer_iface_index,
5308 	    sc->sc_mixer_xfer, uaudio_mixer_config, 1, sc,
5309 	    sc->sc_mixer_lock)) {
5310 		DPRINTFN(0, "could not allocate USB "
5311 		    "transfer for audio mixer!\n");
5312 		return (ENOMEM);
5313 	}
5314 	if (!(sc->sc_mix_info & SOUND_MASK_VOLUME)) {
5315 		mix_setparentchild(m, SOUND_MIXER_VOLUME, SOUND_MASK_PCM);
5316 		mix_setrealdev(m, SOUND_MIXER_VOLUME, SOUND_MIXER_NONE);
5317 	}
5318 	mix_setdevs(m, sc->sc_mix_info);
5319 	mix_setrecdevs(m, sc->sc_recsrc_info);
5320 	return (0);
5321 }
5322 
5323 int
5324 uaudio_mixer_uninit_sub(struct uaudio_softc *sc)
5325 {
5326 	DPRINTF("\n");
5327 
5328 	usbd_transfer_unsetup(sc->sc_mixer_xfer, 1);
5329 
5330 	sc->sc_mixer_lock = NULL;
5331 
5332 	return (0);
5333 }
5334 
5335 void
5336 uaudio_mixer_set(struct uaudio_softc *sc, unsigned type,
5337     unsigned left, unsigned right)
5338 {
5339 	struct uaudio_mixer_node *mc;
5340 	int chan;
5341 
5342 	for (mc = sc->sc_mixer_root; mc != NULL; mc = mc->next) {
5343 
5344 		if (mc->ctl == type) {
5345 			for (chan = 0; chan < mc->nchan; chan++) {
5346 				uaudio_mixer_ctl_set(sc, mc, chan,
5347 				    (int)((chan == 0 ? left : right) *
5348 				    255) / 100);
5349 			}
5350 		}
5351 	}
5352 }
5353 
5354 uint32_t
5355 uaudio_mixer_setrecsrc(struct uaudio_softc *sc, uint32_t src)
5356 {
5357 	struct uaudio_mixer_node *mc;
5358 	uint32_t mask;
5359 	uint32_t temp;
5360 	int32_t i;
5361 
5362 	for (mc = sc->sc_mixer_root; mc;
5363 	    mc = mc->next) {
5364 
5365 		if ((mc->ctl == SOUND_MIXER_NRDEVICES) &&
5366 		    (mc->type == MIX_SELECTOR)) {
5367 
5368 			/* compute selector mask */
5369 
5370 			mask = 0;
5371 			for (i = mc->minval; (i > 0) && (i <= mc->maxval); i++) {
5372 				mask |= (1 << mc->slctrtype[i - 1]);
5373 			}
5374 
5375 			temp = mask & src;
5376 			if (temp == 0) {
5377 				continue;
5378 			}
5379 			/* find the first set bit */
5380 			temp = (-temp) & temp;
5381 
5382 			/* update "src" */
5383 			src &= ~mask;
5384 			src |= temp;
5385 
5386 			for (i = mc->minval; (i > 0) && (i <= mc->maxval); i++) {
5387 				if (temp != (1 << mc->slctrtype[i - 1])) {
5388 					continue;
5389 				}
5390 				uaudio_mixer_ctl_set(sc, mc, 0, i);
5391 				break;
5392 			}
5393 		}
5394 	}
5395 	return (src);
5396 }
5397 
5398 /*========================================================================*
5399  * MIDI support routines
5400  *========================================================================*/
5401 
5402 static void
5403 umidi_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
5404 {
5405 	struct umidi_chan *chan = usbd_xfer_softc(xfer);
5406 	struct umidi_sub_chan *sub;
5407 	struct usb_page_cache *pc;
5408 	uint8_t buf[4];
5409 	uint8_t cmd_len;
5410 	uint8_t cn;
5411 	uint16_t pos;
5412 	int actlen;
5413 
5414 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
5415 
5416 	switch (USB_GET_STATE(xfer)) {
5417 	case USB_ST_TRANSFERRED:
5418 
5419 		DPRINTF("actlen=%d bytes\n", actlen);
5420 
5421 		pos = 0;
5422 		pc = usbd_xfer_get_frame(xfer, 0);
5423 
5424 		while (actlen >= 4) {
5425 
5426 			/* copy out the MIDI data */
5427 			usbd_copy_out(pc, pos, buf, 4);
5428 			/* command length */
5429 			cmd_len = umidi_cmd_to_len[buf[0] & 0xF];
5430 			/* cable number */
5431 			cn = buf[0] >> 4;
5432 			/*
5433 			 * Lookup sub-channel. The index is range
5434 			 * checked below.
5435 			 */
5436 			sub = &chan->sub[cn];
5437 
5438 			if ((cmd_len != 0) && (cn < chan->max_emb_jack) &&
5439 			    (sub->read_open != 0)) {
5440 
5441 				/* Send data to the application */
5442 				usb_fifo_put_data_linear(
5443 				    sub->fifo.fp[USB_FIFO_RX],
5444 				    buf + 1, cmd_len, 1);
5445 			}
5446 			actlen -= 4;
5447 			pos += 4;
5448 		}
5449 
5450 	case USB_ST_SETUP:
5451 		DPRINTF("start\n");
5452 tr_setup:
5453 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
5454 		usbd_transfer_submit(xfer);
5455 		break;
5456 
5457 	default:
5458 		DPRINTF("error=%s\n", usbd_errstr(error));
5459 
5460 		if (error != USB_ERR_CANCELLED) {
5461 			/* try to clear stall first */
5462 			usbd_xfer_set_stall(xfer);
5463 			goto tr_setup;
5464 		}
5465 		break;
5466 	}
5467 }
5468 
5469 /*
5470  * The following statemachine, that converts MIDI commands to
5471  * USB MIDI packets, derives from Linux's usbmidi.c, which
5472  * was written by "Clemens Ladisch":
5473  *
5474  * Returns:
5475  *    0: No command
5476  * Else: Command is complete
5477  */
5478 static uint8_t
5479 umidi_convert_to_usb(struct umidi_sub_chan *sub, uint8_t cn, uint8_t b)
5480 {
5481 	uint8_t p0 = (cn << 4);
5482 
5483 	if (b >= 0xf8) {
5484 		sub->temp_0[0] = p0 | 0x0f;
5485 		sub->temp_0[1] = b;
5486 		sub->temp_0[2] = 0;
5487 		sub->temp_0[3] = 0;
5488 		sub->temp_cmd = sub->temp_0;
5489 		return (1);
5490 
5491 	} else if (b >= 0xf0) {
5492 		switch (b) {
5493 		case 0xf0:		/* system exclusive begin */
5494 			sub->temp_1[1] = b;
5495 			sub->state = UMIDI_ST_SYSEX_1;
5496 			break;
5497 		case 0xf1:		/* MIDI time code */
5498 		case 0xf3:		/* song select */
5499 			sub->temp_1[1] = b;
5500 			sub->state = UMIDI_ST_1PARAM;
5501 			break;
5502 		case 0xf2:		/* song position pointer */
5503 			sub->temp_1[1] = b;
5504 			sub->state = UMIDI_ST_2PARAM_1;
5505 			break;
5506 		case 0xf4:		/* unknown */
5507 		case 0xf5:		/* unknown */
5508 			sub->state = UMIDI_ST_UNKNOWN;
5509 			break;
5510 		case 0xf6:		/* tune request */
5511 			sub->temp_1[0] = p0 | 0x05;
5512 			sub->temp_1[1] = 0xf6;
5513 			sub->temp_1[2] = 0;
5514 			sub->temp_1[3] = 0;
5515 			sub->temp_cmd = sub->temp_1;
5516 			sub->state = UMIDI_ST_UNKNOWN;
5517 			return (1);
5518 
5519 		case 0xf7:		/* system exclusive end */
5520 			switch (sub->state) {
5521 			case UMIDI_ST_SYSEX_0:
5522 				sub->temp_1[0] = p0 | 0x05;
5523 				sub->temp_1[1] = 0xf7;
5524 				sub->temp_1[2] = 0;
5525 				sub->temp_1[3] = 0;
5526 				sub->temp_cmd = sub->temp_1;
5527 				sub->state = UMIDI_ST_UNKNOWN;
5528 				return (1);
5529 			case UMIDI_ST_SYSEX_1:
5530 				sub->temp_1[0] = p0 | 0x06;
5531 				sub->temp_1[2] = 0xf7;
5532 				sub->temp_1[3] = 0;
5533 				sub->temp_cmd = sub->temp_1;
5534 				sub->state = UMIDI_ST_UNKNOWN;
5535 				return (1);
5536 			case UMIDI_ST_SYSEX_2:
5537 				sub->temp_1[0] = p0 | 0x07;
5538 				sub->temp_1[3] = 0xf7;
5539 				sub->temp_cmd = sub->temp_1;
5540 				sub->state = UMIDI_ST_UNKNOWN;
5541 				return (1);
5542 			}
5543 			sub->state = UMIDI_ST_UNKNOWN;
5544 			break;
5545 		}
5546 	} else if (b >= 0x80) {
5547 		sub->temp_1[1] = b;
5548 		if ((b >= 0xc0) && (b <= 0xdf)) {
5549 			sub->state = UMIDI_ST_1PARAM;
5550 		} else {
5551 			sub->state = UMIDI_ST_2PARAM_1;
5552 		}
5553 	} else {			/* b < 0x80 */
5554 		switch (sub->state) {
5555 		case UMIDI_ST_1PARAM:
5556 			if (sub->temp_1[1] < 0xf0) {
5557 				p0 |= sub->temp_1[1] >> 4;
5558 			} else {
5559 				p0 |= 0x02;
5560 				sub->state = UMIDI_ST_UNKNOWN;
5561 			}
5562 			sub->temp_1[0] = p0;
5563 			sub->temp_1[2] = b;
5564 			sub->temp_1[3] = 0;
5565 			sub->temp_cmd = sub->temp_1;
5566 			return (1);
5567 		case UMIDI_ST_2PARAM_1:
5568 			sub->temp_1[2] = b;
5569 			sub->state = UMIDI_ST_2PARAM_2;
5570 			break;
5571 		case UMIDI_ST_2PARAM_2:
5572 			if (sub->temp_1[1] < 0xf0) {
5573 				p0 |= sub->temp_1[1] >> 4;
5574 				sub->state = UMIDI_ST_2PARAM_1;
5575 			} else {
5576 				p0 |= 0x03;
5577 				sub->state = UMIDI_ST_UNKNOWN;
5578 			}
5579 			sub->temp_1[0] = p0;
5580 			sub->temp_1[3] = b;
5581 			sub->temp_cmd = sub->temp_1;
5582 			return (1);
5583 		case UMIDI_ST_SYSEX_0:
5584 			sub->temp_1[1] = b;
5585 			sub->state = UMIDI_ST_SYSEX_1;
5586 			break;
5587 		case UMIDI_ST_SYSEX_1:
5588 			sub->temp_1[2] = b;
5589 			sub->state = UMIDI_ST_SYSEX_2;
5590 			break;
5591 		case UMIDI_ST_SYSEX_2:
5592 			sub->temp_1[0] = p0 | 0x04;
5593 			sub->temp_1[3] = b;
5594 			sub->temp_cmd = sub->temp_1;
5595 			sub->state = UMIDI_ST_SYSEX_0;
5596 			return (1);
5597 		default:
5598 			break;
5599 		}
5600 	}
5601 	return (0);
5602 }
5603 
5604 static void
5605 umidi_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
5606 {
5607 	struct umidi_chan *chan = usbd_xfer_softc(xfer);
5608 	struct umidi_sub_chan *sub;
5609 	struct usb_page_cache *pc;
5610 	uint32_t actlen;
5611 	uint16_t nframes;
5612 	uint8_t buf;
5613 	uint8_t start_cable;
5614 	uint8_t tr_any;
5615 	int len;
5616 
5617 	usbd_xfer_status(xfer, &len, NULL, NULL, NULL);
5618 
5619 	/*
5620 	 * NOTE: Some MIDI devices only accept 4 bytes of data per
5621 	 * short terminated USB transfer.
5622 	 */
5623 	switch (USB_GET_STATE(xfer)) {
5624 	case USB_ST_TRANSFERRED:
5625 		DPRINTF("actlen=%d bytes\n", len);
5626 
5627 	case USB_ST_SETUP:
5628 tr_setup:
5629 		DPRINTF("start\n");
5630 
5631 		nframes = 0;	/* reset */
5632 		start_cable = chan->curr_cable;
5633 		tr_any = 0;
5634 		pc = usbd_xfer_get_frame(xfer, 0);
5635 
5636 		while (1) {
5637 
5638 			/* round robin de-queueing */
5639 
5640 			sub = &chan->sub[chan->curr_cable];
5641 
5642 			if (sub->write_open) {
5643 				usb_fifo_get_data_linear(sub->fifo.fp[USB_FIFO_TX],
5644 				    &buf, 1, &actlen, 0);
5645 			} else {
5646 				actlen = 0;
5647 			}
5648 
5649 			if (actlen) {
5650 
5651 				tr_any = 1;
5652 
5653 				DPRINTF("byte=0x%02x from FIFO %u\n", buf,
5654 				    (unsigned int)chan->curr_cable);
5655 
5656 				if (umidi_convert_to_usb(sub, chan->curr_cable, buf)) {
5657 
5658 					DPRINTF("sub=0x%02x 0x%02x 0x%02x 0x%02x\n",
5659 					    sub->temp_cmd[0], sub->temp_cmd[1],
5660 					    sub->temp_cmd[2], sub->temp_cmd[3]);
5661 
5662 					usbd_copy_in(pc, nframes * 4, sub->temp_cmd, 4);
5663 
5664 					nframes++;
5665 
5666 					if ((nframes >= UMIDI_TX_FRAMES) || (chan->single_command != 0))
5667 						break;
5668 				} else {
5669 					continue;
5670 				}
5671 			}
5672 
5673 			chan->curr_cable++;
5674 			if (chan->curr_cable >= chan->max_emb_jack)
5675 				chan->curr_cable = 0;
5676 
5677 			if (chan->curr_cable == start_cable) {
5678 				if (tr_any == 0)
5679 					break;
5680 				tr_any = 0;
5681 			}
5682 		}
5683 
5684 		if (nframes != 0) {
5685 			DPRINTF("Transferring %d frames\n", (int)nframes);
5686 			usbd_xfer_set_frame_len(xfer, 0, 4 * nframes);
5687 			usbd_transfer_submit(xfer);
5688 		}
5689 		break;
5690 
5691 	default:			/* Error */
5692 
5693 		DPRINTF("error=%s\n", usbd_errstr(error));
5694 
5695 		if (error != USB_ERR_CANCELLED) {
5696 			/* try to clear stall first */
5697 			usbd_xfer_set_stall(xfer);
5698 			goto tr_setup;
5699 		}
5700 		break;
5701 	}
5702 }
5703 
5704 static struct umidi_sub_chan *
5705 umidi_sub_by_fifo(struct usb_fifo *fifo)
5706 {
5707 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5708 	struct umidi_sub_chan *sub;
5709 	uint32_t n;
5710 
5711 	for (n = 0; n < UMIDI_EMB_JACK_MAX; n++) {
5712 		sub = &chan->sub[n];
5713 		if ((sub->fifo.fp[USB_FIFO_RX] == fifo) ||
5714 		    (sub->fifo.fp[USB_FIFO_TX] == fifo)) {
5715 			return (sub);
5716 		}
5717 	}
5718 
5719 	panic("%s:%d cannot find usb_fifo!\n",
5720 	    __FILE__, __LINE__);
5721 
5722 	return (NULL);
5723 }
5724 
5725 static void
5726 umidi_start_read(struct usb_fifo *fifo)
5727 {
5728 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5729 
5730 	usbd_transfer_start(chan->xfer[UMIDI_RX_TRANSFER]);
5731 }
5732 
5733 static void
5734 umidi_stop_read(struct usb_fifo *fifo)
5735 {
5736 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5737 	struct umidi_sub_chan *sub = umidi_sub_by_fifo(fifo);
5738 
5739 	DPRINTF("\n");
5740 
5741 	sub->read_open = 0;
5742 
5743 	if (--(chan->read_open_refcount) == 0) {
5744 		/*
5745 		 * XXX don't stop the read transfer here, hence that causes
5746 		 * problems with some MIDI adapters
5747 		 */
5748 		DPRINTF("(stopping read transfer)\n");
5749 	}
5750 }
5751 
5752 static void
5753 umidi_start_write(struct usb_fifo *fifo)
5754 {
5755 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5756 
5757 	usbd_transfer_start(chan->xfer[UMIDI_TX_TRANSFER]);
5758 }
5759 
5760 static void
5761 umidi_stop_write(struct usb_fifo *fifo)
5762 {
5763 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5764 	struct umidi_sub_chan *sub = umidi_sub_by_fifo(fifo);
5765 
5766 	DPRINTF("\n");
5767 
5768 	sub->write_open = 0;
5769 
5770 	if (--(chan->write_open_refcount) == 0) {
5771 		DPRINTF("(stopping write transfer)\n");
5772 		usbd_transfer_stop(chan->xfer[UMIDI_TX_TRANSFER]);
5773 	}
5774 }
5775 
5776 static int
5777 umidi_open(struct usb_fifo *fifo, int fflags)
5778 {
5779 	struct umidi_chan *chan = usb_fifo_softc(fifo);
5780 	struct umidi_sub_chan *sub = umidi_sub_by_fifo(fifo);
5781 
5782 	if (fflags & FREAD) {
5783 		if (usb_fifo_alloc_buffer(fifo, 4, (1024 / 4))) {
5784 			return (ENOMEM);
5785 		}
5786 		mtx_lock(&chan->mtx);
5787 		chan->read_open_refcount++;
5788 		sub->read_open = 1;
5789 		mtx_unlock(&chan->mtx);
5790 	}
5791 	if (fflags & FWRITE) {
5792 		if (usb_fifo_alloc_buffer(fifo, 32, (1024 / 32))) {
5793 			return (ENOMEM);
5794 		}
5795 		/* clear stall first */
5796 		mtx_lock(&chan->mtx);
5797 		chan->write_open_refcount++;
5798 		sub->write_open = 1;
5799 
5800 		/* reset */
5801 		sub->state = UMIDI_ST_UNKNOWN;
5802 		mtx_unlock(&chan->mtx);
5803 	}
5804 	return (0);			/* success */
5805 }
5806 
5807 static void
5808 umidi_close(struct usb_fifo *fifo, int fflags)
5809 {
5810 	if (fflags & FREAD) {
5811 		usb_fifo_free_buffer(fifo);
5812 	}
5813 	if (fflags & FWRITE) {
5814 		usb_fifo_free_buffer(fifo);
5815 	}
5816 }
5817 
5818 
5819 static int
5820 umidi_ioctl(struct usb_fifo *fifo, u_long cmd, void *data,
5821     int fflags)
5822 {
5823 	return (ENODEV);
5824 }
5825 
5826 static void
5827 umidi_init(device_t dev)
5828 {
5829 	struct uaudio_softc *sc = device_get_softc(dev);
5830 	struct umidi_chan *chan = &sc->sc_midi_chan;
5831 
5832 	mtx_init(&chan->mtx, "umidi lock", NULL, MTX_DEF | MTX_RECURSE);
5833 }
5834 
5835 static struct usb_fifo_methods umidi_fifo_methods = {
5836 	.f_start_read = &umidi_start_read,
5837 	.f_start_write = &umidi_start_write,
5838 	.f_stop_read = &umidi_stop_read,
5839 	.f_stop_write = &umidi_stop_write,
5840 	.f_open = &umidi_open,
5841 	.f_close = &umidi_close,
5842 	.f_ioctl = &umidi_ioctl,
5843 	.basename[0] = "umidi",
5844 };
5845 
5846 static int
5847 umidi_probe(device_t dev)
5848 {
5849 	struct uaudio_softc *sc = device_get_softc(dev);
5850 	struct usb_attach_arg *uaa = device_get_ivars(dev);
5851 	struct umidi_chan *chan = &sc->sc_midi_chan;
5852 	struct umidi_sub_chan *sub;
5853 	int unit = device_get_unit(dev);
5854 	int error;
5855 	uint32_t n;
5856 
5857 	if (usb_test_quirk(uaa, UQ_SINGLE_CMD_MIDI))
5858 		chan->single_command = 1;
5859 
5860 	if (usbd_set_alt_interface_index(sc->sc_udev, chan->iface_index,
5861 	    chan->iface_alt_index)) {
5862 		DPRINTF("setting of alternate index failed!\n");
5863 		goto detach;
5864 	}
5865 	usbd_set_parent_iface(sc->sc_udev, chan->iface_index,
5866 	    sc->sc_mixer_iface_index);
5867 
5868 	error = usbd_transfer_setup(uaa->device, &chan->iface_index,
5869 	    chan->xfer, umidi_config, UMIDI_N_TRANSFER,
5870 	    chan, &chan->mtx);
5871 	if (error) {
5872 		DPRINTF("error=%s\n", usbd_errstr(error));
5873 		goto detach;
5874 	}
5875 
5876 	/*
5877 	 * Some USB MIDI device makers couldn't resist using
5878 	 * wMaxPacketSize = 4 for RX and TX BULK endpoints, although
5879 	 * that size is an unsupported value for FULL speed BULK
5880 	 * endpoints. The same applies to some HIGH speed MIDI devices
5881 	 * which are using a wMaxPacketSize different from 512 bytes.
5882 	 *
5883 	 * Refer to section 5.8.3 in USB 2.0 PDF: Cite: "All Host
5884 	 * Controllers are required to have support for 8-, 16-, 32-,
5885 	 * and 64-byte maximum packet sizes for full-speed bulk
5886 	 * endpoints and 512 bytes for high-speed bulk endpoints."
5887 	 */
5888 	if (usbd_xfer_maxp_was_clamped(chan->xfer[UMIDI_TX_TRANSFER]))
5889 		chan->single_command = 1;
5890 
5891 	if (chan->single_command != 0)
5892 		device_printf(dev, "Single command MIDI quirk enabled\n");
5893 
5894 	if ((chan->max_emb_jack == 0) ||
5895 	    (chan->max_emb_jack > UMIDI_EMB_JACK_MAX)) {
5896 		chan->max_emb_jack = UMIDI_EMB_JACK_MAX;
5897 	}
5898 
5899 	for (n = 0; n < chan->max_emb_jack; n++) {
5900 
5901 		sub = &chan->sub[n];
5902 
5903 		error = usb_fifo_attach(sc->sc_udev, chan, &chan->mtx,
5904 		    &umidi_fifo_methods, &sub->fifo, unit, n,
5905 		    chan->iface_index,
5906 		    UID_ROOT, GID_OPERATOR, 0644);
5907 		if (error) {
5908 			goto detach;
5909 		}
5910 	}
5911 
5912 	mtx_lock(&chan->mtx);
5913 
5914 	/*
5915 	 * NOTE: At least one device will not work properly unless the
5916 	 * BULK IN pipe is open all the time. This might have to do
5917 	 * about that the internal queues of the device overflow if we
5918 	 * don't read them regularly.
5919 	 */
5920 	usbd_transfer_start(chan->xfer[UMIDI_RX_TRANSFER]);
5921 
5922 	mtx_unlock(&chan->mtx);
5923 
5924 	return (0);			/* success */
5925 
5926 detach:
5927 	return (ENXIO);			/* failure */
5928 }
5929 
5930 static int
5931 umidi_detach(device_t dev)
5932 {
5933 	struct uaudio_softc *sc = device_get_softc(dev);
5934 	struct umidi_chan *chan = &sc->sc_midi_chan;
5935 	uint32_t n;
5936 
5937 	for (n = 0; n < UMIDI_EMB_JACK_MAX; n++)
5938 		usb_fifo_detach(&chan->sub[n].fifo);
5939 
5940 	mtx_lock(&chan->mtx);
5941 
5942 	usbd_transfer_stop(chan->xfer[UMIDI_RX_TRANSFER]);
5943 
5944 	mtx_unlock(&chan->mtx);
5945 
5946 	usbd_transfer_unsetup(chan->xfer, UMIDI_N_TRANSFER);
5947 
5948 	mtx_destroy(&chan->mtx);
5949 
5950 	return (0);
5951 }
5952 
5953 static void
5954 uaudio_hid_rx_callback(struct usb_xfer *xfer, usb_error_t error)
5955 {
5956 	struct uaudio_softc *sc = usbd_xfer_softc(xfer);
5957 	const uint8_t *buffer = usbd_xfer_get_frame_buffer(xfer, 0);
5958 	struct snd_mixer *m;
5959 	uint8_t id;
5960 	int actlen;
5961 
5962 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
5963 
5964 	switch (USB_GET_STATE(xfer)) {
5965 	case USB_ST_TRANSFERRED:
5966 		DPRINTF("actlen=%d\n", actlen);
5967 
5968 		if (actlen != 0 &&
5969 		    (sc->sc_hid.flags & UAUDIO_HID_HAS_ID)) {
5970 			id = *buffer;
5971 			buffer++;
5972 			actlen--;
5973 		} else {
5974 			id = 0;
5975 		}
5976 
5977 		m = sc->sc_mixer_dev;
5978 
5979 		if ((sc->sc_hid.flags & UAUDIO_HID_HAS_MUTE) &&
5980 		    (sc->sc_hid.mute_id == id) &&
5981 		    hid_get_data(buffer, actlen,
5982 		    &sc->sc_hid.mute_loc)) {
5983 
5984 			DPRINTF("Mute toggle\n");
5985 
5986 			mixer_hwvol_mute_locked(m);
5987 		}
5988 
5989 		if ((sc->sc_hid.flags & UAUDIO_HID_HAS_VOLUME_UP) &&
5990 		    (sc->sc_hid.volume_up_id == id) &&
5991 		    hid_get_data(buffer, actlen,
5992 		    &sc->sc_hid.volume_up_loc)) {
5993 
5994 			DPRINTF("Volume Up\n");
5995 
5996 			mixer_hwvol_step_locked(m, 1, 1);
5997 		}
5998 
5999 		if ((sc->sc_hid.flags & UAUDIO_HID_HAS_VOLUME_DOWN) &&
6000 		    (sc->sc_hid.volume_down_id == id) &&
6001 		    hid_get_data(buffer, actlen,
6002 		    &sc->sc_hid.volume_down_loc)) {
6003 
6004 			DPRINTF("Volume Down\n");
6005 
6006 			mixer_hwvol_step_locked(m, -1, -1);
6007 		}
6008 
6009 	case USB_ST_SETUP:
6010 tr_setup:
6011 		/* check if we can put more data into the FIFO */
6012 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
6013 		usbd_transfer_submit(xfer);
6014 		break;
6015 
6016 	default:			/* Error */
6017 
6018 		DPRINTF("error=%s\n", usbd_errstr(error));
6019 
6020 		if (error != USB_ERR_CANCELLED) {
6021 			/* try to clear stall first */
6022 			usbd_xfer_set_stall(xfer);
6023 			goto tr_setup;
6024 		}
6025 		break;
6026 	}
6027 }
6028 
6029 static int
6030 uaudio_hid_probe(struct uaudio_softc *sc,
6031     struct usb_attach_arg *uaa)
6032 {
6033 	void *d_ptr;
6034 	uint32_t flags;
6035 	uint16_t d_len;
6036 	uint8_t id;
6037 	int error;
6038 
6039 	if (!(sc->sc_hid.flags & UAUDIO_HID_VALID))
6040 		return (-1);
6041 
6042 	if (sc->sc_mixer_lock == NULL)
6043 		return (-1);
6044 
6045 	/* Get HID descriptor */
6046 	error = usbd_req_get_hid_desc(uaa->device, NULL, &d_ptr,
6047 	    &d_len, M_TEMP, sc->sc_hid.iface_index);
6048 
6049 	if (error) {
6050 		DPRINTF("error reading report description\n");
6051 		return (-1);
6052 	}
6053 
6054 	/* check if there is an ID byte */
6055 	hid_report_size(d_ptr, d_len, hid_input, &id);
6056 
6057 	if (id != 0)
6058 		sc->sc_hid.flags |= UAUDIO_HID_HAS_ID;
6059 
6060 	if (hid_locate(d_ptr, d_len,
6061 	    HID_USAGE2(HUP_CONSUMER, 0xE9 /* Volume Increment */),
6062 	    hid_input, 0, &sc->sc_hid.volume_up_loc, &flags,
6063 	    &sc->sc_hid.volume_up_id)) {
6064 		if (flags & HIO_VARIABLE)
6065 			sc->sc_hid.flags |= UAUDIO_HID_HAS_VOLUME_UP;
6066 		DPRINTFN(1, "Found Volume Up key\n");
6067 	}
6068 
6069 	if (hid_locate(d_ptr, d_len,
6070 	    HID_USAGE2(HUP_CONSUMER, 0xEA /* Volume Decrement */),
6071 	    hid_input, 0, &sc->sc_hid.volume_down_loc, &flags,
6072 	    &sc->sc_hid.volume_down_id)) {
6073 		if (flags & HIO_VARIABLE)
6074 			sc->sc_hid.flags |= UAUDIO_HID_HAS_VOLUME_DOWN;
6075 		DPRINTFN(1, "Found Volume Down key\n");
6076 	}
6077 
6078 	if (hid_locate(d_ptr, d_len,
6079 	    HID_USAGE2(HUP_CONSUMER, 0xE2 /* Mute */),
6080 	    hid_input, 0, &sc->sc_hid.mute_loc, &flags,
6081 	    &sc->sc_hid.mute_id)) {
6082 		if (flags & HIO_VARIABLE)
6083 			sc->sc_hid.flags |= UAUDIO_HID_HAS_MUTE;
6084 		DPRINTFN(1, "Found Mute key\n");
6085 	}
6086 
6087 	free(d_ptr, M_TEMP);
6088 
6089 	if (!(sc->sc_hid.flags & (UAUDIO_HID_HAS_VOLUME_UP |
6090 	    UAUDIO_HID_HAS_VOLUME_DOWN |
6091 	    UAUDIO_HID_HAS_MUTE))) {
6092 		DPRINTFN(1, "Did not find any volume related keys\n");
6093 		return (-1);
6094 	}
6095 
6096 	/* prevent the uhid driver from attaching */
6097 	usbd_set_parent_iface(uaa->device, sc->sc_hid.iface_index,
6098 	    sc->sc_mixer_iface_index);
6099 
6100 	/* allocate USB transfers */
6101 	error = usbd_transfer_setup(uaa->device, &sc->sc_hid.iface_index,
6102 	    sc->sc_hid.xfer, uaudio_hid_config, UAUDIO_HID_N_TRANSFER,
6103 	    sc, sc->sc_mixer_lock);
6104 	if (error) {
6105 		DPRINTF("error=%s\n", usbd_errstr(error));
6106 		return (-1);
6107 	}
6108 	return (0);
6109 }
6110 
6111 static void
6112 uaudio_hid_detach(struct uaudio_softc *sc)
6113 {
6114 	usbd_transfer_unsetup(sc->sc_hid.xfer, UAUDIO_HID_N_TRANSFER);
6115 }
6116 
6117 DRIVER_MODULE_ORDERED(uaudio, uhub, uaudio_driver, uaudio_devclass, NULL, 0, SI_ORDER_ANY);
6118 MODULE_DEPEND(uaudio, usb, 1, 1, 1);
6119 MODULE_DEPEND(uaudio, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
6120 MODULE_VERSION(uaudio, 1);
6121 USB_PNP_HOST_INFO(uaudio_devs);
6122