xref: /dragonfly/sys/bus/u4b/serial/umoscom.c (revision 030b3383) 
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/param.h>
22 #include <sys/queue.h>
23 #include <sys/types.h>
24 #include <sys/systm.h>
25 #include <sys/kernel.h>
26 #include <sys/bus.h>
27 #include <sys/module.h>
28 #include <sys/lock.h>
29 #include <sys/condvar.h>
30 #include <sys/sysctl.h>
31 #include <sys/unistd.h>
32 #include <sys/callout.h>
33 #include <sys/malloc.h>
34 #include <sys/priv.h>
35 #include <sys/serial.h>
36 
37 #include <bus/u4b/usb.h>
38 #include <bus/u4b/usbdi.h>
39 #include <bus/u4b/usbdi_util.h>
40 #include "usbdevs.h"
41 
42 #define	USB_DEBUG_VAR umoscom_debug
43 #include <bus/u4b/usb_debug.h>
44 #include <bus/u4b/usb_process.h>
45 
46 #include <bus/u4b/serial/usb_serial.h>
47 
48 #ifdef USB_DEBUG
49 static int umoscom_debug = 0;
50 
51 static SYSCTL_NODE(_hw_usb, OID_AUTO, umoscom, CTLFLAG_RW, 0, "USB umoscom");
52 SYSCTL_INT(_hw_usb_umoscom, OID_AUTO, debug, CTLFLAG_RW,
53     &umoscom_debug, 0, "Debug level");
54 #endif
55 
56 #define	UMOSCOM_BUFSIZE	       1024	/* bytes */
57 
58 #define	UMOSCOM_CONFIG_INDEX	0
59 #define	UMOSCOM_IFACE_INDEX	0
60 
61 /* interrupt packet */
62 #define	UMOSCOM_IIR_RLS		0x06
63 #define	UMOSCOM_IIR_RDA		0x04
64 #define	UMOSCOM_IIR_CTI		0x0c
65 #define	UMOSCOM_IIR_THR		0x02
66 #define	UMOSCOM_IIR_MS		0x00
67 
68 /* registers */
69 #define	UMOSCOM_READ		0x0d
70 #define	UMOSCOM_WRITE		0x0e
71 #define	UMOSCOM_UART_REG	0x0300
72 #define	UMOSCOM_VEND_REG	0x0000
73 
74 #define	UMOSCOM_TXBUF		0x00	/* Write */
75 #define	UMOSCOM_RXBUF		0x00	/* Read */
76 #define	UMOSCOM_INT		0x01
77 #define	UMOSCOM_FIFO		0x02	/* Write */
78 #define	UMOSCOM_ISR		0x02	/* Read */
79 #define	UMOSCOM_LCR		0x03
80 #define	UMOSCOM_MCR		0x04
81 #define	UMOSCOM_LSR		0x05
82 #define	UMOSCOM_MSR		0x06
83 #define	UMOSCOM_SCRATCH		0x07
84 #define	UMOSCOM_DIV_LO		0x08
85 #define	UMOSCOM_DIV_HI		0x09
86 #define	UMOSCOM_EFR		0x0a
87 #define	UMOSCOM_XON1		0x0b
88 #define	UMOSCOM_XON2		0x0c
89 #define	UMOSCOM_XOFF1		0x0d
90 #define	UMOSCOM_XOFF2		0x0e
91 
92 #define	UMOSCOM_BAUDLO		0x00
93 #define	UMOSCOM_BAUDHI		0x01
94 
95 #define	UMOSCOM_INT_RXEN	0x01
96 #define	UMOSCOM_INT_TXEN	0x02
97 #define	UMOSCOM_INT_RSEN	0x04
98 #define	UMOSCOM_INT_MDMEM	0x08
99 #define	UMOSCOM_INT_SLEEP	0x10
100 #define	UMOSCOM_INT_XOFF	0x20
101 #define	UMOSCOM_INT_RTS		0x40
102 
103 #define	UMOSCOM_FIFO_EN		0x01
104 #define	UMOSCOM_FIFO_RXCLR	0x02
105 #define	UMOSCOM_FIFO_TXCLR	0x04
106 #define	UMOSCOM_FIFO_DMA_BLK	0x08
107 #define	UMOSCOM_FIFO_TXLVL_MASK	0x30
108 #define	UMOSCOM_FIFO_TXLVL_8	0x00
109 #define	UMOSCOM_FIFO_TXLVL_16	0x10
110 #define	UMOSCOM_FIFO_TXLVL_32	0x20
111 #define	UMOSCOM_FIFO_TXLVL_56	0x30
112 #define	UMOSCOM_FIFO_RXLVL_MASK	0xc0
113 #define	UMOSCOM_FIFO_RXLVL_8	0x00
114 #define	UMOSCOM_FIFO_RXLVL_16	0x40
115 #define	UMOSCOM_FIFO_RXLVL_56	0x80
116 #define	UMOSCOM_FIFO_RXLVL_80	0xc0
117 
118 #define	UMOSCOM_ISR_MDM		0x00
119 #define	UMOSCOM_ISR_NONE	0x01
120 #define	UMOSCOM_ISR_TX		0x02
121 #define	UMOSCOM_ISR_RX		0x04
122 #define	UMOSCOM_ISR_LINE	0x06
123 #define	UMOSCOM_ISR_RXTIMEOUT	0x0c
124 #define	UMOSCOM_ISR_RX_XOFF	0x10
125 #define	UMOSCOM_ISR_RTSCTS	0x20
126 #define	UMOSCOM_ISR_FIFOEN	0xc0
127 
128 #define	UMOSCOM_LCR_DBITS(x)	((x) - 5)
129 #define	UMOSCOM_LCR_STOP_BITS_1	0x00
130 #define	UMOSCOM_LCR_STOP_BITS_2	0x04	/* 2 if 6-8 bits/char or 1.5 if 5 */
131 #define	UMOSCOM_LCR_PARITY_NONE	0x00
132 #define	UMOSCOM_LCR_PARITY_ODD	0x08
133 #define	UMOSCOM_LCR_PARITY_EVEN	0x18
134 #define	UMOSCOM_LCR_BREAK	0x40
135 #define	UMOSCOM_LCR_DIVLATCH_EN	0x80
136 
137 #define	UMOSCOM_MCR_DTR		0x01
138 #define	UMOSCOM_MCR_RTS		0x02
139 #define	UMOSCOM_MCR_LOOP	0x04
140 #define	UMOSCOM_MCR_INTEN	0x08
141 #define	UMOSCOM_MCR_LOOPBACK	0x10
142 #define	UMOSCOM_MCR_XONANY	0x20
143 #define	UMOSCOM_MCR_IRDA_EN	0x40
144 #define	UMOSCOM_MCR_BAUD_DIV4	0x80
145 
146 #define	UMOSCOM_LSR_RXDATA	0x01
147 #define	UMOSCOM_LSR_RXOVER	0x02
148 #define	UMOSCOM_LSR_RXPAR_ERR	0x04
149 #define	UMOSCOM_LSR_RXFRM_ERR	0x08
150 #define	UMOSCOM_LSR_RXBREAK	0x10
151 #define	UMOSCOM_LSR_TXEMPTY	0x20
152 #define	UMOSCOM_LSR_TXALLEMPTY	0x40
153 #define	UMOSCOM_LSR_TXFIFO_ERR	0x80
154 
155 #define	UMOSCOM_MSR_CTS_CHG	0x01
156 #define	UMOSCOM_MSR_DSR_CHG	0x02
157 #define	UMOSCOM_MSR_RI_CHG	0x04
158 #define	UMOSCOM_MSR_CD_CHG	0x08
159 #define	UMOSCOM_MSR_CTS		0x10
160 #define	UMOSCOM_MSR_RTS		0x20
161 #define	UMOSCOM_MSR_RI		0x40
162 #define	UMOSCOM_MSR_CD		0x80
163 
164 #define	UMOSCOM_BAUD_REF	115200
165 
166 enum {
167 	UMOSCOM_BULK_DT_WR,
168 	UMOSCOM_BULK_DT_RD,
169 	UMOSCOM_INTR_DT_RD,
170 	UMOSCOM_N_TRANSFER,
171 };
172 
173 struct umoscom_softc {
174 	struct ucom_super_softc sc_super_ucom;
175 	struct ucom_softc sc_ucom;
176 
177 	struct usb_xfer *sc_xfer[UMOSCOM_N_TRANSFER];
178 	struct usb_device *sc_udev;
179 	struct lock sc_lock;
180 
181 	uint8_t	sc_mcr;
182 	uint8_t	sc_lcr;
183 };
184 
185 /* prototypes */
186 
187 static device_probe_t umoscom_probe;
188 static device_attach_t umoscom_attach;
189 static device_detach_t umoscom_detach;
190 
191 static usb_callback_t umoscom_write_callback;
192 static usb_callback_t umoscom_read_callback;
193 static usb_callback_t umoscom_intr_callback;
194 
195 static void	umoscom_cfg_open(struct ucom_softc *);
196 static void	umoscom_cfg_close(struct ucom_softc *);
197 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
198 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
199 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
200 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
201 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
202 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
203 		    uint8_t *);
204 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
205 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
206 static void	umoscom_start_read(struct ucom_softc *);
207 static void	umoscom_stop_read(struct ucom_softc *);
208 static void	umoscom_start_write(struct ucom_softc *);
209 static void	umoscom_stop_write(struct ucom_softc *);
210 static void	umoscom_poll(struct ucom_softc *ucom);
211 
212 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
213 
214 	[UMOSCOM_BULK_DT_WR] = {
215 		.type = UE_BULK,
216 		.endpoint = UE_ADDR_ANY,
217 		.direction = UE_DIR_OUT,
218 		.bufsize = UMOSCOM_BUFSIZE,
219 		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
220 		.callback = &umoscom_write_callback,
221 	},
222 
223 	[UMOSCOM_BULK_DT_RD] = {
224 		.type = UE_BULK,
225 		.endpoint = UE_ADDR_ANY,
226 		.direction = UE_DIR_IN,
227 		.bufsize = UMOSCOM_BUFSIZE,
228 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
229 		.callback = &umoscom_read_callback,
230 	},
231 
232 	[UMOSCOM_INTR_DT_RD] = {
233 		.type = UE_INTERRUPT,
234 		.endpoint = UE_ADDR_ANY,
235 		.direction = UE_DIR_IN,
236 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
237 		.bufsize = 0,	/* use wMaxPacketSize */
238 		.callback = &umoscom_intr_callback,
239 	},
240 };
241 
242 static const struct ucom_callback umoscom_callback = {
243 	/* configuration callbacks */
244 	.ucom_cfg_get_status = &umoscom_cfg_get_status,
245 	.ucom_cfg_set_dtr = &umoscom_cfg_set_dtr,
246 	.ucom_cfg_set_rts = &umoscom_cfg_set_rts,
247 	.ucom_cfg_set_break = &umoscom_cfg_set_break,
248 	.ucom_cfg_param = &umoscom_cfg_param,
249 	.ucom_cfg_open = &umoscom_cfg_open,
250 	.ucom_cfg_close = &umoscom_cfg_close,
251 
252 	/* other callbacks */
253 	.ucom_pre_param = &umoscom_pre_param,
254 	.ucom_start_read = &umoscom_start_read,
255 	.ucom_stop_read = &umoscom_stop_read,
256 	.ucom_start_write = &umoscom_start_write,
257 	.ucom_stop_write = &umoscom_stop_write,
258 	.ucom_poll = &umoscom_poll,
259 };
260 
261 static device_method_t umoscom_methods[] = {
262 	DEVMETHOD(device_probe, umoscom_probe),
263 	DEVMETHOD(device_attach, umoscom_attach),
264 	DEVMETHOD(device_detach, umoscom_detach),
265 	DEVMETHOD_END
266 };
267 
268 static devclass_t umoscom_devclass;
269 
270 static driver_t umoscom_driver = {
271 	.name = "umoscom",
272 	.methods = umoscom_methods,
273 	.size = sizeof(struct umoscom_softc),
274 };
275 
276 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
277 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
278 };
279 
280 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, NULL);
281 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
282 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
283 MODULE_VERSION(umoscom, 1);
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 	lockinit(&sc->sc_lock, "umoscom", 0, LK_CANRECURSE);
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_lock);
323 
324 	if (error) {
325 		goto detach;
326 	}
327 	/* clear stall at first run */
328 	lockmgr(&sc->sc_lock, LK_EXCLUSIVE);
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 	lockmgr(&sc->sc_lock, LK_RELEASE);
332 
333 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
334 	    &umoscom_callback, &sc->sc_lock);
335 	if (error) {
336 		goto detach;
337 	}
338 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
339 
340 	return (0);
341 
342 detach:
343 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
344 	umoscom_detach(dev);
345 	return (ENXIO);
346 }
347 
348 static int
349 umoscom_detach(device_t dev)
350 {
351 	struct umoscom_softc *sc = device_get_softc(dev);
352 
353 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
354 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
355 	lockuninit(&sc->sc_lock);
356 
357 	return (0);
358 }
359 
360 static void
361 umoscom_cfg_open(struct ucom_softc *ucom)
362 {
363 	struct umoscom_softc *sc = ucom->sc_parent;
364 
365 	DPRINTF("\n");
366 
367 	/* Purge FIFOs or odd things happen */
368 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
369 
370 	/* Enable FIFO */
371 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
372 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
373 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
374 	    UMOSCOM_UART_REG);
375 
376 	/* Enable Interrupt Registers */
377 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
378 
379 	/* Magic */
380 	umoscom_cfg_write(sc, 0x01, 0x08);
381 
382 	/* Magic */
383 	umoscom_cfg_write(sc, 0x00, 0x02);
384 }
385 
386 static void
387 umoscom_cfg_close(struct ucom_softc *ucom)
388 {
389 	return;
390 }
391 
392 static void
393 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
394 {
395 	struct umoscom_softc *sc = ucom->sc_parent;
396 	uint16_t val;
397 
398 	val = sc->sc_lcr;
399 	if (onoff)
400 		val |= UMOSCOM_LCR_BREAK;
401 
402 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
403 }
404 
405 static void
406 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
407 {
408 	struct umoscom_softc *sc = ucom->sc_parent;
409 
410 	if (onoff)
411 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
412 	else
413 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
414 
415 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
416 }
417 
418 static void
419 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
420 {
421 	struct umoscom_softc *sc = ucom->sc_parent;
422 
423 	if (onoff)
424 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
425 	else
426 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
427 
428 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
429 }
430 
431 static int
432 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
433 {
434 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
435 		return (EINVAL);
436 
437 	return (0);
438 }
439 
440 static void
441 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
442 {
443 	struct umoscom_softc *sc = ucom->sc_parent;
444 	uint16_t data;
445 
446 	DPRINTF("speed=%d\n", t->c_ospeed);
447 
448 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
449 
450 	if (data == 0) {
451 		DPRINTF("invalid baud rate!\n");
452 		return;
453 	}
454 	umoscom_cfg_write(sc, UMOSCOM_LCR,
455 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
456 
457 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
458 	    (data & 0xFF) | UMOSCOM_UART_REG);
459 
460 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
461 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
462 
463 	if (t->c_cflag & CSTOPB)
464 		data = UMOSCOM_LCR_STOP_BITS_2;
465 	else
466 		data = UMOSCOM_LCR_STOP_BITS_1;
467 
468 	if (t->c_cflag & PARENB) {
469 		if (t->c_cflag & PARODD)
470 			data |= UMOSCOM_LCR_PARITY_ODD;
471 		else
472 			data |= UMOSCOM_LCR_PARITY_EVEN;
473 	} else
474 		data |= UMOSCOM_LCR_PARITY_NONE;
475 
476 	switch (t->c_cflag & CSIZE) {
477 	case CS5:
478 		data |= UMOSCOM_LCR_DBITS(5);
479 		break;
480 	case CS6:
481 		data |= UMOSCOM_LCR_DBITS(6);
482 		break;
483 	case CS7:
484 		data |= UMOSCOM_LCR_DBITS(7);
485 		break;
486 	case CS8:
487 		data |= UMOSCOM_LCR_DBITS(8);
488 		break;
489 	}
490 
491 	sc->sc_lcr = data;
492 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
493 }
494 
495 static void
496 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
497 {
498 	struct umoscom_softc *sc = ucom->sc_parent;
499 	uint8_t lsr;
500 	uint8_t msr;
501 
502 	DPRINTFN(5, "\n");
503 
504 	/* read status registers */
505 
506 	lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
507 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
508 
509 	/* translate bits */
510 
511 	if (msr & UMOSCOM_MSR_CTS)
512 		*p_msr |= SER_CTS;
513 
514 	if (msr & UMOSCOM_MSR_CD)
515 		*p_msr |= SER_DCD;
516 
517 	if (msr & UMOSCOM_MSR_RI)
518 		*p_msr |= SER_RI;
519 
520 	if (msr & UMOSCOM_MSR_RTS)
521 		*p_msr |= SER_DSR;
522 }
523 
524 static void
525 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
526 {
527 	struct usb_device_request req;
528 
529 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
530 	req.bRequest = UMOSCOM_WRITE;
531 	USETW(req.wValue, val);
532 	USETW(req.wIndex, reg);
533 	USETW(req.wLength, 0);
534 
535 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
536 	    &req, NULL, 0, 1000);
537 }
538 
539 static uint8_t
540 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
541 {
542 	struct usb_device_request req;
543 	uint8_t val;
544 
545 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
546 	req.bRequest = UMOSCOM_READ;
547 	USETW(req.wValue, 0);
548 	USETW(req.wIndex, reg);
549 	USETW(req.wLength, 1);
550 
551 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
552 	    &req, &val, 0, 1000);
553 
554 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
555 
556 	return (val);
557 }
558 
559 static void
560 umoscom_start_read(struct ucom_softc *ucom)
561 {
562 	struct umoscom_softc *sc = ucom->sc_parent;
563 
564 #if 0
565 	/* start interrupt endpoint */
566 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
567 #endif
568 	/* start read endpoint */
569 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
570 }
571 
572 static void
573 umoscom_stop_read(struct ucom_softc *ucom)
574 {
575 	struct umoscom_softc *sc = ucom->sc_parent;
576 
577 	/* stop interrupt transfer */
578 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
579 
580 	/* stop read endpoint */
581 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
582 }
583 
584 static void
585 umoscom_start_write(struct ucom_softc *ucom)
586 {
587 	struct umoscom_softc *sc = ucom->sc_parent;
588 
589 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
590 }
591 
592 static void
593 umoscom_stop_write(struct ucom_softc *ucom)
594 {
595 	struct umoscom_softc *sc = ucom->sc_parent;
596 
597 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
598 }
599 
600 static void
601 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
602 {
603 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
604 	struct usb_page_cache *pc;
605 	uint32_t actlen;
606 
607 	switch (USB_GET_STATE(xfer)) {
608 	case USB_ST_SETUP:
609 	case USB_ST_TRANSFERRED:
610 tr_setup:
611 		DPRINTF("\n");
612 
613 		pc = usbd_xfer_get_frame(xfer, 0);
614 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
615 		    UMOSCOM_BUFSIZE, &actlen)) {
616 
617 			usbd_xfer_set_frame_len(xfer, 0, actlen);
618 			usbd_transfer_submit(xfer);
619 		}
620 		return;
621 
622 	default:			/* Error */
623 		if (error != USB_ERR_CANCELLED) {
624 			DPRINTFN(0, "transfer failed\n");
625 			/* try to clear stall first */
626 			usbd_xfer_set_stall(xfer);
627 			goto tr_setup;
628 		}
629 		return;
630 	}
631 }
632 
633 static void
634 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
635 {
636 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
637 	struct usb_page_cache *pc;
638 	int actlen;
639 
640 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
641 
642 	switch (USB_GET_STATE(xfer)) {
643 	case USB_ST_TRANSFERRED:
644 		DPRINTF("got %d bytes\n", actlen);
645 		pc = usbd_xfer_get_frame(xfer, 0);
646 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
647 
648 	case USB_ST_SETUP:
649 tr_setup:
650 		DPRINTF("\n");
651 
652 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
653 		usbd_transfer_submit(xfer);
654 		return;
655 
656 	default:			/* Error */
657 		if (error != USB_ERR_CANCELLED) {
658 			DPRINTFN(0, "transfer failed\n");
659 			/* try to clear stall first */
660 			usbd_xfer_set_stall(xfer);
661 			goto tr_setup;
662 		}
663 		return;
664 	}
665 }
666 
667 static void
668 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
669 {
670 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
671 	int actlen;
672 
673 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
674 
675 	switch (USB_GET_STATE(xfer)) {
676 	case USB_ST_TRANSFERRED:
677 		if (actlen < 2) {
678 			DPRINTF("too short message\n");
679 			goto tr_setup;
680 		}
681 		ucom_status_change(&sc->sc_ucom);
682 
683 	case USB_ST_SETUP:
684 tr_setup:
685 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
686 		usbd_transfer_submit(xfer);
687 		return;
688 
689 	default:			/* Error */
690 		if (error != USB_ERR_CANCELLED) {
691 			DPRINTFN(0, "transfer failed\n");
692 			/* try to clear stall first */
693 			usbd_xfer_set_stall(xfer);
694 			goto tr_setup;
695 		}
696 		return;
697 	}
698 }
699 
700 static void
701 umoscom_poll(struct ucom_softc *ucom)
702 {
703 	struct umoscom_softc *sc = ucom->sc_parent;
704 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
705 }
706