xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision 0e1497aefd602cea581d2380d22e67dfdcac6b4e) 
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 #ifdef 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 static void	umoscom_poll(struct ucom_softc *ucom);
214 
215 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
216 
217 	[UMOSCOM_BULK_DT_WR] = {
218 		.type = UE_BULK,
219 		.endpoint = UE_ADDR_ANY,
220 		.direction = UE_DIR_OUT,
221 		.bufsize = UMOSCOM_BUFSIZE,
222 		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
223 		.callback = &umoscom_write_callback,
224 	},
225 
226 	[UMOSCOM_BULK_DT_RD] = {
227 		.type = UE_BULK,
228 		.endpoint = UE_ADDR_ANY,
229 		.direction = UE_DIR_IN,
230 		.bufsize = UMOSCOM_BUFSIZE,
231 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
232 		.callback = &umoscom_read_callback,
233 	},
234 
235 	[UMOSCOM_INTR_DT_RD] = {
236 		.type = UE_INTERRUPT,
237 		.endpoint = UE_ADDR_ANY,
238 		.direction = UE_DIR_IN,
239 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
240 		.bufsize = 0,	/* use wMaxPacketSize */
241 		.callback = &umoscom_intr_callback,
242 	},
243 };
244 
245 static const struct ucom_callback umoscom_callback = {
246 	/* configuration callbacks */
247 	.ucom_cfg_get_status = &umoscom_cfg_get_status,
248 	.ucom_cfg_set_dtr = &umoscom_cfg_set_dtr,
249 	.ucom_cfg_set_rts = &umoscom_cfg_set_rts,
250 	.ucom_cfg_set_break = &umoscom_cfg_set_break,
251 	.ucom_cfg_param = &umoscom_cfg_param,
252 	.ucom_cfg_open = &umoscom_cfg_open,
253 	.ucom_cfg_close = &umoscom_cfg_close,
254 
255 	/* other callbacks */
256 	.ucom_pre_param = &umoscom_pre_param,
257 	.ucom_start_read = &umoscom_start_read,
258 	.ucom_stop_read = &umoscom_stop_read,
259 	.ucom_start_write = &umoscom_start_write,
260 	.ucom_stop_write = &umoscom_stop_write,
261 	.ucom_poll = &umoscom_poll,
262 };
263 
264 static device_method_t umoscom_methods[] = {
265 	DEVMETHOD(device_probe, umoscom_probe),
266 	DEVMETHOD(device_attach, umoscom_attach),
267 	DEVMETHOD(device_detach, umoscom_detach),
268 	{0, 0}
269 };
270 
271 static devclass_t umoscom_devclass;
272 
273 static driver_t umoscom_driver = {
274 	.name = "umoscom",
275 	.methods = umoscom_methods,
276 	.size = sizeof(struct umoscom_softc),
277 };
278 
279 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, 0);
280 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
281 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
282 MODULE_VERSION(umoscom, 1);
283 
284 static const struct usb_device_id umoscom_devs[] = {
285 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
286 };
287 
288 static int
289 umoscom_probe(device_t dev)
290 {
291 	struct usb_attach_arg *uaa = device_get_ivars(dev);
292 
293 	if (uaa->usb_mode != USB_MODE_HOST) {
294 		return (ENXIO);
295 	}
296 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
297 		return (ENXIO);
298 	}
299 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
300 		return (ENXIO);
301 	}
302 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
303 }
304 
305 static int
306 umoscom_attach(device_t dev)
307 {
308 	struct usb_attach_arg *uaa = device_get_ivars(dev);
309 	struct umoscom_softc *sc = device_get_softc(dev);
310 	int error;
311 	uint8_t iface_index;
312 
313 	sc->sc_udev = uaa->device;
314 	sc->sc_mcr = 0x08;		/* enable interrupts */
315 
316 	/* XXX the device doesn't provide any ID string, so set a static one */
317 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
318 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
319 
320 	mtx_init(&sc->sc_mtx, "umoscom", NULL, MTX_DEF);
321 
322 	iface_index = UMOSCOM_IFACE_INDEX;
323 	error = usbd_transfer_setup(uaa->device, &iface_index,
324 	    sc->sc_xfer, umoscom_config_data,
325 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
326 
327 	if (error) {
328 		goto detach;
329 	}
330 	/* clear stall at first run */
331 	mtx_lock(&sc->sc_mtx);
332 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
333 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
334 	mtx_unlock(&sc->sc_mtx);
335 
336 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
337 	    &umoscom_callback, &sc->sc_mtx);
338 	if (error) {
339 		goto detach;
340 	}
341 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
342 
343 	return (0);
344 
345 detach:
346 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
347 	umoscom_detach(dev);
348 	return (ENXIO);
349 }
350 
351 static int
352 umoscom_detach(device_t dev)
353 {
354 	struct umoscom_softc *sc = device_get_softc(dev);
355 
356 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
357 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
358 	mtx_destroy(&sc->sc_mtx);
359 
360 	return (0);
361 }
362 
363 static void
364 umoscom_cfg_open(struct ucom_softc *ucom)
365 {
366 	struct umoscom_softc *sc = ucom->sc_parent;
367 
368 	DPRINTF("\n");
369 
370 	/* Purge FIFOs or odd things happen */
371 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
372 
373 	/* Enable FIFO */
374 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
375 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
376 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
377 	    UMOSCOM_UART_REG);
378 
379 	/* Enable Interrupt Registers */
380 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
381 
382 	/* Magic */
383 	umoscom_cfg_write(sc, 0x01, 0x08);
384 
385 	/* Magic */
386 	umoscom_cfg_write(sc, 0x00, 0x02);
387 }
388 
389 static void
390 umoscom_cfg_close(struct ucom_softc *ucom)
391 {
392 	return;
393 }
394 
395 static void
396 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
397 {
398 	struct umoscom_softc *sc = ucom->sc_parent;
399 	uint16_t val;
400 
401 	val = sc->sc_lcr;
402 	if (onoff)
403 		val |= UMOSCOM_LCR_BREAK;
404 
405 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
406 }
407 
408 static void
409 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
410 {
411 	struct umoscom_softc *sc = ucom->sc_parent;
412 
413 	if (onoff)
414 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
415 	else
416 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
417 
418 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
419 }
420 
421 static void
422 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
423 {
424 	struct umoscom_softc *sc = ucom->sc_parent;
425 
426 	if (onoff)
427 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
428 	else
429 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
430 
431 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
432 }
433 
434 static int
435 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
436 {
437 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
438 		return (EINVAL);
439 
440 	return (0);
441 }
442 
443 static void
444 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
445 {
446 	struct umoscom_softc *sc = ucom->sc_parent;
447 	uint16_t data;
448 
449 	DPRINTF("speed=%d\n", t->c_ospeed);
450 
451 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
452 
453 	if (data == 0) {
454 		DPRINTF("invalid baud rate!\n");
455 		return;
456 	}
457 	umoscom_cfg_write(sc, UMOSCOM_LCR,
458 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
459 
460 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
461 	    (data & 0xFF) | UMOSCOM_UART_REG);
462 
463 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
464 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
465 
466 	if (t->c_cflag & CSTOPB)
467 		data = UMOSCOM_LCR_STOP_BITS_2;
468 	else
469 		data = UMOSCOM_LCR_STOP_BITS_1;
470 
471 	if (t->c_cflag & PARENB) {
472 		if (t->c_cflag & PARODD)
473 			data |= UMOSCOM_LCR_PARITY_ODD;
474 		else
475 			data |= UMOSCOM_LCR_PARITY_EVEN;
476 	} else
477 		data |= UMOSCOM_LCR_PARITY_NONE;
478 
479 	switch (t->c_cflag & CSIZE) {
480 	case CS5:
481 		data |= UMOSCOM_LCR_DBITS(5);
482 		break;
483 	case CS6:
484 		data |= UMOSCOM_LCR_DBITS(6);
485 		break;
486 	case CS7:
487 		data |= UMOSCOM_LCR_DBITS(7);
488 		break;
489 	case CS8:
490 		data |= UMOSCOM_LCR_DBITS(8);
491 		break;
492 	}
493 
494 	sc->sc_lcr = data;
495 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
496 }
497 
498 static void
499 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
500 {
501 	struct umoscom_softc *sc = ucom->sc_parent;
502 	uint8_t lsr;
503 	uint8_t msr;
504 
505 	DPRINTFN(5, "\n");
506 
507 	/* read status registers */
508 
509 	lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
510 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
511 
512 	/* translate bits */
513 
514 	if (msr & UMOSCOM_MSR_CTS)
515 		*p_msr |= SER_CTS;
516 
517 	if (msr & UMOSCOM_MSR_CD)
518 		*p_msr |= SER_DCD;
519 
520 	if (msr & UMOSCOM_MSR_RI)
521 		*p_msr |= SER_RI;
522 
523 	if (msr & UMOSCOM_MSR_RTS)
524 		*p_msr |= SER_DSR;
525 }
526 
527 static void
528 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
529 {
530 	struct usb_device_request req;
531 
532 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
533 	req.bRequest = UMOSCOM_WRITE;
534 	USETW(req.wValue, val);
535 	USETW(req.wIndex, reg);
536 	USETW(req.wLength, 0);
537 
538 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
539 	    &req, NULL, 0, 1000);
540 }
541 
542 static uint8_t
543 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
544 {
545 	struct usb_device_request req;
546 	uint8_t val;
547 
548 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
549 	req.bRequest = UMOSCOM_READ;
550 	USETW(req.wValue, 0);
551 	USETW(req.wIndex, reg);
552 	USETW(req.wLength, 1);
553 
554 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
555 	    &req, &val, 0, 1000);
556 
557 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
558 
559 	return (val);
560 }
561 
562 static void
563 umoscom_start_read(struct ucom_softc *ucom)
564 {
565 	struct umoscom_softc *sc = ucom->sc_parent;
566 
567 #if 0
568 	/* start interrupt endpoint */
569 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
570 #endif
571 	/* start read endpoint */
572 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
573 }
574 
575 static void
576 umoscom_stop_read(struct ucom_softc *ucom)
577 {
578 	struct umoscom_softc *sc = ucom->sc_parent;
579 
580 	/* stop interrupt transfer */
581 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
582 
583 	/* stop read endpoint */
584 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
585 }
586 
587 static void
588 umoscom_start_write(struct ucom_softc *ucom)
589 {
590 	struct umoscom_softc *sc = ucom->sc_parent;
591 
592 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
593 }
594 
595 static void
596 umoscom_stop_write(struct ucom_softc *ucom)
597 {
598 	struct umoscom_softc *sc = ucom->sc_parent;
599 
600 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
601 }
602 
603 static void
604 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
605 {
606 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
607 	struct usb_page_cache *pc;
608 	uint32_t actlen;
609 
610 	switch (USB_GET_STATE(xfer)) {
611 	case USB_ST_SETUP:
612 	case USB_ST_TRANSFERRED:
613 tr_setup:
614 		DPRINTF("\n");
615 
616 		pc = usbd_xfer_get_frame(xfer, 0);
617 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
618 		    UMOSCOM_BUFSIZE, &actlen)) {
619 
620 			usbd_xfer_set_frame_len(xfer, 0, actlen);
621 			usbd_transfer_submit(xfer);
622 		}
623 		return;
624 
625 	default:			/* Error */
626 		if (error != USB_ERR_CANCELLED) {
627 			DPRINTFN(0, "transfer failed\n");
628 			/* try to clear stall first */
629 			usbd_xfer_set_stall(xfer);
630 			goto tr_setup;
631 		}
632 		return;
633 	}
634 }
635 
636 static void
637 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
638 {
639 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
640 	struct usb_page_cache *pc;
641 	int actlen;
642 
643 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
644 
645 	switch (USB_GET_STATE(xfer)) {
646 	case USB_ST_TRANSFERRED:
647 		DPRINTF("got %d bytes\n", actlen);
648 		pc = usbd_xfer_get_frame(xfer, 0);
649 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
650 
651 	case USB_ST_SETUP:
652 tr_setup:
653 		DPRINTF("\n");
654 
655 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
656 		usbd_transfer_submit(xfer);
657 		return;
658 
659 	default:			/* Error */
660 		if (error != USB_ERR_CANCELLED) {
661 			DPRINTFN(0, "transfer failed\n");
662 			/* try to clear stall first */
663 			usbd_xfer_set_stall(xfer);
664 			goto tr_setup;
665 		}
666 		return;
667 	}
668 }
669 
670 static void
671 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
672 {
673 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
674 	int actlen;
675 
676 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
677 
678 	switch (USB_GET_STATE(xfer)) {
679 	case USB_ST_TRANSFERRED:
680 		if (actlen < 2) {
681 			DPRINTF("too short message\n");
682 			goto tr_setup;
683 		}
684 		ucom_status_change(&sc->sc_ucom);
685 
686 	case USB_ST_SETUP:
687 tr_setup:
688 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
689 		usbd_transfer_submit(xfer);
690 		return;
691 
692 	default:			/* Error */
693 		if (error != USB_ERR_CANCELLED) {
694 			DPRINTFN(0, "transfer failed\n");
695 			/* try to clear stall first */
696 			usbd_xfer_set_stall(xfer);
697 			goto tr_setup;
698 		}
699 		return;
700 	}
701 }
702 
703 static void
704 umoscom_poll(struct ucom_softc *ucom)
705 {
706 	struct umoscom_softc *sc = ucom->sc_parent;
707 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
708 }
709