xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision eb6219e337483cb80eccb6f2b4ad649bc1d751ec) 
1 /* $FreeBSD$ */
2 /*	$OpenBSD: umoscom.c,v 1.2 2006/10/26 06:02:43 jsg Exp $	*/
3 
4 /*
5  * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 #include <sys/stdint.h>
21 #include <sys/stddef.h>
22 #include <sys/param.h>
23 #include <sys/queue.h>
24 #include <sys/types.h>
25 #include <sys/systm.h>
26 #include <sys/kernel.h>
27 #include <sys/bus.h>
28 #include <sys/linker_set.h>
29 #include <sys/module.h>
30 #include <sys/lock.h>
31 #include <sys/mutex.h>
32 #include <sys/condvar.h>
33 #include <sys/sysctl.h>
34 #include <sys/sx.h>
35 #include <sys/unistd.h>
36 #include <sys/callout.h>
37 #include <sys/malloc.h>
38 #include <sys/priv.h>
39 
40 #include <dev/usb/usb.h>
41 #include <dev/usb/usbdi.h>
42 #include <dev/usb/usbdi_util.h>
43 #include "usbdevs.h"
44 
45 #define	USB_DEBUG_VAR umoscom_debug
46 #include <dev/usb/usb_debug.h>
47 #include <dev/usb/usb_process.h>
48 
49 #include <dev/usb/serial/usb_serial.h>
50 
51 #if USB_DEBUG
52 static int umoscom_debug = 0;
53 
54 SYSCTL_NODE(_hw_usb, OID_AUTO, umoscom, CTLFLAG_RW, 0, "USB umoscom");
55 SYSCTL_INT(_hw_usb_umoscom, OID_AUTO, debug, CTLFLAG_RW,
56     &umoscom_debug, 0, "Debug level");
57 #endif
58 
59 #define	UMOSCOM_BUFSIZE	       1024	/* bytes */
60 
61 #define	UMOSCOM_CONFIG_INDEX	0
62 #define	UMOSCOM_IFACE_INDEX	0
63 
64 /* interrupt packet */
65 #define	UMOSCOM_IIR_RLS		0x06
66 #define	UMOSCOM_IIR_RDA		0x04
67 #define	UMOSCOM_IIR_CTI		0x0c
68 #define	UMOSCOM_IIR_THR		0x02
69 #define	UMOSCOM_IIR_MS		0x00
70 
71 /* registers */
72 #define	UMOSCOM_READ		0x0d
73 #define	UMOSCOM_WRITE		0x0e
74 #define	UMOSCOM_UART_REG	0x0300
75 #define	UMOSCOM_VEND_REG	0x0000
76 
77 #define	UMOSCOM_TXBUF		0x00	/* Write */
78 #define	UMOSCOM_RXBUF		0x00	/* Read */
79 #define	UMOSCOM_INT		0x01
80 #define	UMOSCOM_FIFO		0x02	/* Write */
81 #define	UMOSCOM_ISR		0x02	/* Read */
82 #define	UMOSCOM_LCR		0x03
83 #define	UMOSCOM_MCR		0x04
84 #define	UMOSCOM_LSR		0x05
85 #define	UMOSCOM_MSR		0x06
86 #define	UMOSCOM_SCRATCH		0x07
87 #define	UMOSCOM_DIV_LO		0x08
88 #define	UMOSCOM_DIV_HI		0x09
89 #define	UMOSCOM_EFR		0x0a
90 #define	UMOSCOM_XON1		0x0b
91 #define	UMOSCOM_XON2		0x0c
92 #define	UMOSCOM_XOFF1		0x0d
93 #define	UMOSCOM_XOFF2		0x0e
94 
95 #define	UMOSCOM_BAUDLO		0x00
96 #define	UMOSCOM_BAUDHI		0x01
97 
98 #define	UMOSCOM_INT_RXEN	0x01
99 #define	UMOSCOM_INT_TXEN	0x02
100 #define	UMOSCOM_INT_RSEN	0x04
101 #define	UMOSCOM_INT_MDMEM	0x08
102 #define	UMOSCOM_INT_SLEEP	0x10
103 #define	UMOSCOM_INT_XOFF	0x20
104 #define	UMOSCOM_INT_RTS		0x40
105 
106 #define	UMOSCOM_FIFO_EN		0x01
107 #define	UMOSCOM_FIFO_RXCLR	0x02
108 #define	UMOSCOM_FIFO_TXCLR	0x04
109 #define	UMOSCOM_FIFO_DMA_BLK	0x08
110 #define	UMOSCOM_FIFO_TXLVL_MASK	0x30
111 #define	UMOSCOM_FIFO_TXLVL_8	0x00
112 #define	UMOSCOM_FIFO_TXLVL_16	0x10
113 #define	UMOSCOM_FIFO_TXLVL_32	0x20
114 #define	UMOSCOM_FIFO_TXLVL_56	0x30
115 #define	UMOSCOM_FIFO_RXLVL_MASK	0xc0
116 #define	UMOSCOM_FIFO_RXLVL_8	0x00
117 #define	UMOSCOM_FIFO_RXLVL_16	0x40
118 #define	UMOSCOM_FIFO_RXLVL_56	0x80
119 #define	UMOSCOM_FIFO_RXLVL_80	0xc0
120 
121 #define	UMOSCOM_ISR_MDM		0x00
122 #define	UMOSCOM_ISR_NONE	0x01
123 #define	UMOSCOM_ISR_TX		0x02
124 #define	UMOSCOM_ISR_RX		0x04
125 #define	UMOSCOM_ISR_LINE	0x06
126 #define	UMOSCOM_ISR_RXTIMEOUT	0x0c
127 #define	UMOSCOM_ISR_RX_XOFF	0x10
128 #define	UMOSCOM_ISR_RTSCTS	0x20
129 #define	UMOSCOM_ISR_FIFOEN	0xc0
130 
131 #define	UMOSCOM_LCR_DBITS(x)	((x) - 5)
132 #define	UMOSCOM_LCR_STOP_BITS_1	0x00
133 #define	UMOSCOM_LCR_STOP_BITS_2	0x04	/* 2 if 6-8 bits/char or 1.5 if 5 */
134 #define	UMOSCOM_LCR_PARITY_NONE	0x00
135 #define	UMOSCOM_LCR_PARITY_ODD	0x08
136 #define	UMOSCOM_LCR_PARITY_EVEN	0x18
137 #define	UMOSCOM_LCR_BREAK	0x40
138 #define	UMOSCOM_LCR_DIVLATCH_EN	0x80
139 
140 #define	UMOSCOM_MCR_DTR		0x01
141 #define	UMOSCOM_MCR_RTS		0x02
142 #define	UMOSCOM_MCR_LOOP	0x04
143 #define	UMOSCOM_MCR_INTEN	0x08
144 #define	UMOSCOM_MCR_LOOPBACK	0x10
145 #define	UMOSCOM_MCR_XONANY	0x20
146 #define	UMOSCOM_MCR_IRDA_EN	0x40
147 #define	UMOSCOM_MCR_BAUD_DIV4	0x80
148 
149 #define	UMOSCOM_LSR_RXDATA	0x01
150 #define	UMOSCOM_LSR_RXOVER	0x02
151 #define	UMOSCOM_LSR_RXPAR_ERR	0x04
152 #define	UMOSCOM_LSR_RXFRM_ERR	0x08
153 #define	UMOSCOM_LSR_RXBREAK	0x10
154 #define	UMOSCOM_LSR_TXEMPTY	0x20
155 #define	UMOSCOM_LSR_TXALLEMPTY	0x40
156 #define	UMOSCOM_LSR_TXFIFO_ERR	0x80
157 
158 #define	UMOSCOM_MSR_CTS_CHG	0x01
159 #define	UMOSCOM_MSR_DSR_CHG	0x02
160 #define	UMOSCOM_MSR_RI_CHG	0x04
161 #define	UMOSCOM_MSR_CD_CHG	0x08
162 #define	UMOSCOM_MSR_CTS		0x10
163 #define	UMOSCOM_MSR_RTS		0x20
164 #define	UMOSCOM_MSR_RI		0x40
165 #define	UMOSCOM_MSR_CD		0x80
166 
167 #define	UMOSCOM_BAUD_REF	115200
168 
169 enum {
170 	UMOSCOM_BULK_DT_WR,
171 	UMOSCOM_BULK_DT_RD,
172 	UMOSCOM_INTR_DT_RD,
173 	UMOSCOM_N_TRANSFER,
174 };
175 
176 struct umoscom_softc {
177 	struct ucom_super_softc sc_super_ucom;
178 	struct ucom_softc sc_ucom;
179 
180 	struct usb_xfer *sc_xfer[UMOSCOM_N_TRANSFER];
181 	struct usb_device *sc_udev;
182 	struct mtx sc_mtx;
183 
184 	uint8_t	sc_mcr;
185 	uint8_t	sc_lcr;
186 };
187 
188 /* prototypes */
189 
190 static device_probe_t umoscom_probe;
191 static device_attach_t umoscom_attach;
192 static device_detach_t umoscom_detach;
193 
194 static usb_callback_t umoscom_write_callback;
195 static usb_callback_t umoscom_read_callback;
196 static usb_callback_t umoscom_intr_callback;
197 
198 static void	umoscom_cfg_open(struct ucom_softc *);
199 static void	umoscom_cfg_close(struct ucom_softc *);
200 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
201 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
202 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
203 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
204 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
205 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
206 		    uint8_t *);
207 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
208 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
209 static void	umoscom_start_read(struct ucom_softc *);
210 static void	umoscom_stop_read(struct ucom_softc *);
211 static void	umoscom_start_write(struct ucom_softc *);
212 static void	umoscom_stop_write(struct ucom_softc *);
213 
214 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
215 
216 	[UMOSCOM_BULK_DT_WR] = {
217 		.type = UE_BULK,
218 		.endpoint = UE_ADDR_ANY,
219 		.direction = UE_DIR_OUT,
220 		.bufsize = UMOSCOM_BUFSIZE,
221 		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
222 		.callback = &umoscom_write_callback,
223 	},
224 
225 	[UMOSCOM_BULK_DT_RD] = {
226 		.type = UE_BULK,
227 		.endpoint = UE_ADDR_ANY,
228 		.direction = UE_DIR_IN,
229 		.bufsize = UMOSCOM_BUFSIZE,
230 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
231 		.callback = &umoscom_read_callback,
232 	},
233 
234 	[UMOSCOM_INTR_DT_RD] = {
235 		.type = UE_INTERRUPT,
236 		.endpoint = UE_ADDR_ANY,
237 		.direction = UE_DIR_IN,
238 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
239 		.bufsize = 0,	/* use wMaxPacketSize */
240 		.callback = &umoscom_intr_callback,
241 	},
242 };
243 
244 static const struct ucom_callback umoscom_callback = {
245 	/* configuration callbacks */
246 	.ucom_cfg_get_status = &umoscom_cfg_get_status,
247 	.ucom_cfg_set_dtr = &umoscom_cfg_set_dtr,
248 	.ucom_cfg_set_rts = &umoscom_cfg_set_rts,
249 	.ucom_cfg_set_break = &umoscom_cfg_set_break,
250 	.ucom_cfg_param = &umoscom_cfg_param,
251 	.ucom_cfg_open = &umoscom_cfg_open,
252 	.ucom_cfg_close = &umoscom_cfg_close,
253 
254 	/* other callbacks */
255 	.ucom_pre_param = &umoscom_pre_param,
256 	.ucom_start_read = &umoscom_start_read,
257 	.ucom_stop_read = &umoscom_stop_read,
258 	.ucom_start_write = &umoscom_start_write,
259 	.ucom_stop_write = &umoscom_stop_write,
260 };
261 
262 static device_method_t umoscom_methods[] = {
263 	DEVMETHOD(device_probe, umoscom_probe),
264 	DEVMETHOD(device_attach, umoscom_attach),
265 	DEVMETHOD(device_detach, umoscom_detach),
266 	{0, 0}
267 };
268 
269 static devclass_t umoscom_devclass;
270 
271 static driver_t umoscom_driver = {
272 	.name = "umoscom",
273 	.methods = umoscom_methods,
274 	.size = sizeof(struct umoscom_softc),
275 };
276 
277 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, 0);
278 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
279 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
280 
281 static const struct usb_device_id umoscom_devs[] = {
282 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
283 };
284 
285 static int
286 umoscom_probe(device_t dev)
287 {
288 	struct usb_attach_arg *uaa = device_get_ivars(dev);
289 
290 	if (uaa->usb_mode != USB_MODE_HOST) {
291 		return (ENXIO);
292 	}
293 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
294 		return (ENXIO);
295 	}
296 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
297 		return (ENXIO);
298 	}
299 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
300 }
301 
302 static int
303 umoscom_attach(device_t dev)
304 {
305 	struct usb_attach_arg *uaa = device_get_ivars(dev);
306 	struct umoscom_softc *sc = device_get_softc(dev);
307 	int error;
308 	uint8_t iface_index;
309 
310 	sc->sc_udev = uaa->device;
311 	sc->sc_mcr = 0x08;		/* enable interrupts */
312 
313 	/* XXX the device doesn't provide any ID string, so set a static one */
314 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
315 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
316 
317 	mtx_init(&sc->sc_mtx, "umoscom", NULL, MTX_DEF);
318 
319 	iface_index = UMOSCOM_IFACE_INDEX;
320 	error = usbd_transfer_setup(uaa->device, &iface_index,
321 	    sc->sc_xfer, umoscom_config_data,
322 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
323 
324 	if (error) {
325 		goto detach;
326 	}
327 	/* clear stall at first run */
328 	mtx_lock(&sc->sc_mtx);
329 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
330 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
331 	mtx_unlock(&sc->sc_mtx);
332 
333 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
334 	    &umoscom_callback, &sc->sc_mtx);
335 	if (error) {
336 		goto detach;
337 	}
338 	return (0);
339 
340 detach:
341 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
342 	umoscom_detach(dev);
343 	return (ENXIO);
344 }
345 
346 static int
347 umoscom_detach(device_t dev)
348 {
349 	struct umoscom_softc *sc = device_get_softc(dev);
350 
351 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom, 1);
352 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
353 	mtx_destroy(&sc->sc_mtx);
354 
355 	return (0);
356 }
357 
358 static void
359 umoscom_cfg_open(struct ucom_softc *ucom)
360 {
361 	struct umoscom_softc *sc = ucom->sc_parent;
362 
363 	DPRINTF("\n");
364 
365 	/* Purge FIFOs or odd things happen */
366 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
367 
368 	/* Enable FIFO */
369 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
370 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
371 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
372 	    UMOSCOM_UART_REG);
373 
374 	/* Enable Interrupt Registers */
375 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
376 
377 	/* Magic */
378 	umoscom_cfg_write(sc, 0x01, 0x08);
379 
380 	/* Magic */
381 	umoscom_cfg_write(sc, 0x00, 0x02);
382 }
383 
384 static void
385 umoscom_cfg_close(struct ucom_softc *ucom)
386 {
387 	return;
388 }
389 
390 static void
391 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
392 {
393 	struct umoscom_softc *sc = ucom->sc_parent;
394 	uint16_t val;
395 
396 	val = sc->sc_lcr;
397 	if (onoff)
398 		val |= UMOSCOM_LCR_BREAK;
399 
400 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
401 }
402 
403 static void
404 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
405 {
406 	struct umoscom_softc *sc = ucom->sc_parent;
407 
408 	if (onoff)
409 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
410 	else
411 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
412 
413 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
414 }
415 
416 static void
417 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
418 {
419 	struct umoscom_softc *sc = ucom->sc_parent;
420 
421 	if (onoff)
422 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
423 	else
424 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
425 
426 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
427 }
428 
429 static int
430 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
431 {
432 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
433 		return (EINVAL);
434 
435 	return (0);
436 }
437 
438 static void
439 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
440 {
441 	struct umoscom_softc *sc = ucom->sc_parent;
442 	uint16_t data;
443 
444 	DPRINTF("speed=%d\n", t->c_ospeed);
445 
446 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
447 
448 	if (data == 0) {
449 		DPRINTF("invalid baud rate!\n");
450 		return;
451 	}
452 	umoscom_cfg_write(sc, UMOSCOM_LCR,
453 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
454 
455 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
456 	    (data & 0xFF) | UMOSCOM_UART_REG);
457 
458 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
459 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
460 
461 	if (t->c_cflag & CSTOPB)
462 		data = UMOSCOM_LCR_STOP_BITS_2;
463 	else
464 		data = UMOSCOM_LCR_STOP_BITS_1;
465 
466 	if (t->c_cflag & PARENB) {
467 		if (t->c_cflag & PARODD)
468 			data |= UMOSCOM_LCR_PARITY_ODD;
469 		else
470 			data |= UMOSCOM_LCR_PARITY_EVEN;
471 	} else
472 		data |= UMOSCOM_LCR_PARITY_NONE;
473 
474 	switch (t->c_cflag & CSIZE) {
475 	case CS5:
476 		data |= UMOSCOM_LCR_DBITS(5);
477 		break;
478 	case CS6:
479 		data |= UMOSCOM_LCR_DBITS(6);
480 		break;
481 	case CS7:
482 		data |= UMOSCOM_LCR_DBITS(7);
483 		break;
484 	case CS8:
485 		data |= UMOSCOM_LCR_DBITS(8);
486 		break;
487 	}
488 
489 	sc->sc_lcr = data;
490 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
491 }
492 
493 static void
494 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
495 {
496 	struct umoscom_softc *sc = ucom->sc_parent;
497 	uint8_t lsr;
498 	uint8_t msr;
499 
500 	DPRINTFN(5, "\n");
501 
502 	/* read status registers */
503 
504 	lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
505 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
506 
507 	/* translate bits */
508 
509 	if (msr & UMOSCOM_MSR_CTS)
510 		*p_msr |= SER_CTS;
511 
512 	if (msr & UMOSCOM_MSR_CD)
513 		*p_msr |= SER_DCD;
514 
515 	if (msr & UMOSCOM_MSR_RI)
516 		*p_msr |= SER_RI;
517 
518 	if (msr & UMOSCOM_MSR_RTS)
519 		*p_msr |= SER_DSR;
520 }
521 
522 static void
523 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
524 {
525 	struct usb_device_request req;
526 
527 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
528 	req.bRequest = UMOSCOM_WRITE;
529 	USETW(req.wValue, val);
530 	USETW(req.wIndex, reg);
531 	USETW(req.wLength, 0);
532 
533 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
534 	    &req, NULL, 0, 1000);
535 }
536 
537 static uint8_t
538 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
539 {
540 	struct usb_device_request req;
541 	uint8_t val;
542 
543 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
544 	req.bRequest = UMOSCOM_READ;
545 	USETW(req.wValue, 0);
546 	USETW(req.wIndex, reg);
547 	USETW(req.wLength, 1);
548 
549 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
550 	    &req, &val, 0, 1000);
551 
552 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
553 
554 	return (val);
555 }
556 
557 static void
558 umoscom_start_read(struct ucom_softc *ucom)
559 {
560 	struct umoscom_softc *sc = ucom->sc_parent;
561 
562 #if 0
563 	/* start interrupt endpoint */
564 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
565 #endif
566 	/* start read endpoint */
567 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
568 }
569 
570 static void
571 umoscom_stop_read(struct ucom_softc *ucom)
572 {
573 	struct umoscom_softc *sc = ucom->sc_parent;
574 
575 	/* stop interrupt transfer */
576 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
577 
578 	/* stop read endpoint */
579 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
580 }
581 
582 static void
583 umoscom_start_write(struct ucom_softc *ucom)
584 {
585 	struct umoscom_softc *sc = ucom->sc_parent;
586 
587 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
588 }
589 
590 static void
591 umoscom_stop_write(struct ucom_softc *ucom)
592 {
593 	struct umoscom_softc *sc = ucom->sc_parent;
594 
595 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
596 }
597 
598 static void
599 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
600 {
601 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
602 	struct usb_page_cache *pc;
603 	uint32_t actlen;
604 
605 	switch (USB_GET_STATE(xfer)) {
606 	case USB_ST_SETUP:
607 	case USB_ST_TRANSFERRED:
608 tr_setup:
609 		DPRINTF("\n");
610 
611 		pc = usbd_xfer_get_frame(xfer, 0);
612 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
613 		    UMOSCOM_BUFSIZE, &actlen)) {
614 
615 			usbd_xfer_set_frame_len(xfer, 0, actlen);
616 			usbd_transfer_submit(xfer);
617 		}
618 		return;
619 
620 	default:			/* Error */
621 		if (error != USB_ERR_CANCELLED) {
622 			DPRINTFN(0, "transfer failed\n");
623 			/* try to clear stall first */
624 			usbd_xfer_set_stall(xfer);
625 			goto tr_setup;
626 		}
627 		return;
628 	}
629 }
630 
631 static void
632 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
633 {
634 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
635 	struct usb_page_cache *pc;
636 	int actlen;
637 
638 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
639 
640 	switch (USB_GET_STATE(xfer)) {
641 	case USB_ST_TRANSFERRED:
642 		DPRINTF("got %d bytes\n", actlen);
643 		pc = usbd_xfer_get_frame(xfer, 0);
644 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
645 
646 	case USB_ST_SETUP:
647 tr_setup:
648 		DPRINTF("\n");
649 
650 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
651 		usbd_transfer_submit(xfer);
652 		return;
653 
654 	default:			/* Error */
655 		if (error != USB_ERR_CANCELLED) {
656 			DPRINTFN(0, "transfer failed\n");
657 			/* try to clear stall first */
658 			usbd_xfer_set_stall(xfer);
659 			goto tr_setup;
660 		}
661 		return;
662 	}
663 }
664 
665 static void
666 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
667 {
668 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
669 	int actlen;
670 
671 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
672 
673 	switch (USB_GET_STATE(xfer)) {
674 	case USB_ST_TRANSFERRED:
675 		if (actlen < 2) {
676 			DPRINTF("too short message\n");
677 			goto tr_setup;
678 		}
679 		ucom_status_change(&sc->sc_ucom);
680 
681 	case USB_ST_SETUP:
682 tr_setup:
683 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
684 		usbd_transfer_submit(xfer);
685 		return;
686 
687 	default:			/* Error */
688 		if (error != USB_ERR_CANCELLED) {
689 			DPRINTFN(0, "transfer failed\n");
690 			/* try to clear stall first */
691 			usbd_xfer_set_stall(xfer);
692 			goto tr_setup;
693 		}
694 		return;
695 	}
696 }
697