xref: /dragonfly/sys/bus/u4b/serial/umoscom.c (revision dadd6466) 
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 
36 #include <bus/u4b/usb.h>
37 #include <bus/u4b/usbdi.h>
38 #include <bus/u4b/usbdi_util.h>
39 #include <bus/u4b/usbdevs.h>
40 
41 #define	USB_DEBUG_VAR umoscom_debug
42 #include <bus/u4b/usb_debug.h>
43 #include <bus/u4b/usb_process.h>
44 
45 #include <bus/u4b/serial/usb_serial.h>
46 
47 #ifdef USB_DEBUG
48 static int umoscom_debug = 0;
49 
50 static SYSCTL_NODE(_hw_usb, OID_AUTO, umoscom, CTLFLAG_RW, 0, "USB umoscom");
51 SYSCTL_INT(_hw_usb_umoscom, OID_AUTO, debug, CTLFLAG_RW,
52     &umoscom_debug, 0, "Debug level");
53 #endif
54 
55 #define	UMOSCOM_BUFSIZE	       1024	/* bytes */
56 
57 #define	UMOSCOM_CONFIG_INDEX	0
58 #define	UMOSCOM_IFACE_INDEX	0
59 
60 /* interrupt packet */
61 #define	UMOSCOM_IIR_RLS		0x06
62 #define	UMOSCOM_IIR_RDA		0x04
63 #define	UMOSCOM_IIR_CTI		0x0c
64 #define	UMOSCOM_IIR_THR		0x02
65 #define	UMOSCOM_IIR_MS		0x00
66 
67 /* registers */
68 #define	UMOSCOM_READ		0x0d
69 #define	UMOSCOM_WRITE		0x0e
70 #define	UMOSCOM_UART_REG	0x0300
71 #define	UMOSCOM_VEND_REG	0x0000
72 
73 #define	UMOSCOM_TXBUF		0x00	/* Write */
74 #define	UMOSCOM_RXBUF		0x00	/* Read */
75 #define	UMOSCOM_INT		0x01
76 #define	UMOSCOM_FIFO		0x02	/* Write */
77 #define	UMOSCOM_ISR		0x02	/* Read */
78 #define	UMOSCOM_LCR		0x03
79 #define	UMOSCOM_MCR		0x04
80 #define	UMOSCOM_LSR		0x05
81 #define	UMOSCOM_MSR		0x06
82 #define	UMOSCOM_SCRATCH		0x07
83 #define	UMOSCOM_DIV_LO		0x08
84 #define	UMOSCOM_DIV_HI		0x09
85 #define	UMOSCOM_EFR		0x0a
86 #define	UMOSCOM_XON1		0x0b
87 #define	UMOSCOM_XON2		0x0c
88 #define	UMOSCOM_XOFF1		0x0d
89 #define	UMOSCOM_XOFF2		0x0e
90 
91 #define	UMOSCOM_BAUDLO		0x00
92 #define	UMOSCOM_BAUDHI		0x01
93 
94 #define	UMOSCOM_INT_RXEN	0x01
95 #define	UMOSCOM_INT_TXEN	0x02
96 #define	UMOSCOM_INT_RSEN	0x04
97 #define	UMOSCOM_INT_MDMEM	0x08
98 #define	UMOSCOM_INT_SLEEP	0x10
99 #define	UMOSCOM_INT_XOFF	0x20
100 #define	UMOSCOM_INT_RTS		0x40
101 
102 #define	UMOSCOM_FIFO_EN		0x01
103 #define	UMOSCOM_FIFO_RXCLR	0x02
104 #define	UMOSCOM_FIFO_TXCLR	0x04
105 #define	UMOSCOM_FIFO_DMA_BLK	0x08
106 #define	UMOSCOM_FIFO_TXLVL_MASK	0x30
107 #define	UMOSCOM_FIFO_TXLVL_8	0x00
108 #define	UMOSCOM_FIFO_TXLVL_16	0x10
109 #define	UMOSCOM_FIFO_TXLVL_32	0x20
110 #define	UMOSCOM_FIFO_TXLVL_56	0x30
111 #define	UMOSCOM_FIFO_RXLVL_MASK	0xc0
112 #define	UMOSCOM_FIFO_RXLVL_8	0x00
113 #define	UMOSCOM_FIFO_RXLVL_16	0x40
114 #define	UMOSCOM_FIFO_RXLVL_56	0x80
115 #define	UMOSCOM_FIFO_RXLVL_80	0xc0
116 
117 #define	UMOSCOM_ISR_MDM		0x00
118 #define	UMOSCOM_ISR_NONE	0x01
119 #define	UMOSCOM_ISR_TX		0x02
120 #define	UMOSCOM_ISR_RX		0x04
121 #define	UMOSCOM_ISR_LINE	0x06
122 #define	UMOSCOM_ISR_RXTIMEOUT	0x0c
123 #define	UMOSCOM_ISR_RX_XOFF	0x10
124 #define	UMOSCOM_ISR_RTSCTS	0x20
125 #define	UMOSCOM_ISR_FIFOEN	0xc0
126 
127 #define	UMOSCOM_LCR_DBITS(x)	((x) - 5)
128 #define	UMOSCOM_LCR_STOP_BITS_1	0x00
129 #define	UMOSCOM_LCR_STOP_BITS_2	0x04	/* 2 if 6-8 bits/char or 1.5 if 5 */
130 #define	UMOSCOM_LCR_PARITY_NONE	0x00
131 #define	UMOSCOM_LCR_PARITY_ODD	0x08
132 #define	UMOSCOM_LCR_PARITY_EVEN	0x18
133 #define	UMOSCOM_LCR_BREAK	0x40
134 #define	UMOSCOM_LCR_DIVLATCH_EN	0x80
135 
136 #define	UMOSCOM_MCR_DTR		0x01
137 #define	UMOSCOM_MCR_RTS		0x02
138 #define	UMOSCOM_MCR_LOOP	0x04
139 #define	UMOSCOM_MCR_INTEN	0x08
140 #define	UMOSCOM_MCR_LOOPBACK	0x10
141 #define	UMOSCOM_MCR_XONANY	0x20
142 #define	UMOSCOM_MCR_IRDA_EN	0x40
143 #define	UMOSCOM_MCR_BAUD_DIV4	0x80
144 
145 #define	UMOSCOM_LSR_RXDATA	0x01
146 #define	UMOSCOM_LSR_RXOVER	0x02
147 #define	UMOSCOM_LSR_RXPAR_ERR	0x04
148 #define	UMOSCOM_LSR_RXFRM_ERR	0x08
149 #define	UMOSCOM_LSR_RXBREAK	0x10
150 #define	UMOSCOM_LSR_TXEMPTY	0x20
151 #define	UMOSCOM_LSR_TXALLEMPTY	0x40
152 #define	UMOSCOM_LSR_TXFIFO_ERR	0x80
153 
154 #define	UMOSCOM_MSR_CTS_CHG	0x01
155 #define	UMOSCOM_MSR_DSR_CHG	0x02
156 #define	UMOSCOM_MSR_RI_CHG	0x04
157 #define	UMOSCOM_MSR_CD_CHG	0x08
158 #define	UMOSCOM_MSR_CTS		0x10
159 #define	UMOSCOM_MSR_RTS		0x20
160 #define	UMOSCOM_MSR_RI		0x40
161 #define	UMOSCOM_MSR_CD		0x80
162 
163 #define	UMOSCOM_BAUD_REF	115200
164 
165 enum {
166 	UMOSCOM_BULK_DT_WR,
167 	UMOSCOM_BULK_DT_RD,
168 	UMOSCOM_INTR_DT_RD,
169 	UMOSCOM_N_TRANSFER,
170 };
171 
172 struct umoscom_softc {
173 	struct ucom_super_softc sc_super_ucom;
174 	struct ucom_softc sc_ucom;
175 
176 	struct usb_xfer *sc_xfer[UMOSCOM_N_TRANSFER];
177 	struct usb_device *sc_udev;
178 	struct lock sc_lock;
179 
180 	uint8_t	sc_mcr;
181 	uint8_t	sc_lcr;
182 };
183 
184 /* prototypes */
185 
186 static device_probe_t umoscom_probe;
187 static device_attach_t umoscom_attach;
188 static device_detach_t umoscom_detach;
189 
190 static usb_callback_t umoscom_write_callback;
191 static usb_callback_t umoscom_read_callback;
192 static usb_callback_t umoscom_intr_callback;
193 
194 static void	umoscom_cfg_open(struct ucom_softc *);
195 static void	umoscom_cfg_close(struct ucom_softc *);
196 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
197 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
198 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
199 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
200 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
201 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
202 		    uint8_t *);
203 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
204 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
205 static void	umoscom_start_read(struct ucom_softc *);
206 static void	umoscom_stop_read(struct ucom_softc *);
207 static void	umoscom_start_write(struct ucom_softc *);
208 static void	umoscom_stop_write(struct ucom_softc *);
209 static void	umoscom_poll(struct ucom_softc *ucom);
210 
211 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
212 
213 	[UMOSCOM_BULK_DT_WR] = {
214 		.type = UE_BULK,
215 		.endpoint = UE_ADDR_ANY,
216 		.direction = UE_DIR_OUT,
217 		.bufsize = UMOSCOM_BUFSIZE,
218 		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
219 		.callback = &umoscom_write_callback,
220 	},
221 
222 	[UMOSCOM_BULK_DT_RD] = {
223 		.type = UE_BULK,
224 		.endpoint = UE_ADDR_ANY,
225 		.direction = UE_DIR_IN,
226 		.bufsize = UMOSCOM_BUFSIZE,
227 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
228 		.callback = &umoscom_read_callback,
229 	},
230 
231 	[UMOSCOM_INTR_DT_RD] = {
232 		.type = UE_INTERRUPT,
233 		.endpoint = UE_ADDR_ANY,
234 		.direction = UE_DIR_IN,
235 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
236 		.bufsize = 0,	/* use wMaxPacketSize */
237 		.callback = &umoscom_intr_callback,
238 	},
239 };
240 
241 static const struct ucom_callback umoscom_callback = {
242 	/* configuration callbacks */
243 	.ucom_cfg_get_status = &umoscom_cfg_get_status,
244 	.ucom_cfg_set_dtr = &umoscom_cfg_set_dtr,
245 	.ucom_cfg_set_rts = &umoscom_cfg_set_rts,
246 	.ucom_cfg_set_break = &umoscom_cfg_set_break,
247 	.ucom_cfg_param = &umoscom_cfg_param,
248 	.ucom_cfg_open = &umoscom_cfg_open,
249 	.ucom_cfg_close = &umoscom_cfg_close,
250 
251 	/* other callbacks */
252 	.ucom_pre_param = &umoscom_pre_param,
253 	.ucom_start_read = &umoscom_start_read,
254 	.ucom_stop_read = &umoscom_stop_read,
255 	.ucom_start_write = &umoscom_start_write,
256 	.ucom_stop_write = &umoscom_stop_write,
257 	.ucom_poll = &umoscom_poll,
258 };
259 
260 static device_method_t umoscom_methods[] = {
261 	DEVMETHOD(device_probe, umoscom_probe),
262 	DEVMETHOD(device_attach, umoscom_attach),
263 	DEVMETHOD(device_detach, umoscom_detach),
264 	DEVMETHOD_END
265 };
266 
267 static devclass_t umoscom_devclass;
268 
269 static driver_t umoscom_driver = {
270 	.name = "umoscom",
271 	.methods = umoscom_methods,
272 	.size = sizeof(struct umoscom_softc),
273 };
274 
275 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, 0);
276 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
277 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
278 MODULE_VERSION(umoscom, 1);
279 
280 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
281 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
282 };
283 
284 static int
285 umoscom_probe(device_t dev)
286 {
287 	struct usb_attach_arg *uaa = device_get_ivars(dev);
288 
289 	if (uaa->usb_mode != USB_MODE_HOST) {
290 		return (ENXIO);
291 	}
292 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
293 		return (ENXIO);
294 	}
295 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
296 		return (ENXIO);
297 	}
298 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
299 }
300 
301 static int
302 umoscom_attach(device_t dev)
303 {
304 	struct usb_attach_arg *uaa = device_get_ivars(dev);
305 	struct umoscom_softc *sc = device_get_softc(dev);
306 	int error;
307 	uint8_t iface_index;
308 
309 	sc->sc_udev = uaa->device;
310 	sc->sc_mcr = 0x08;		/* enable interrupts */
311 
312 	/* XXX the device doesn't provide any ID string, so set a static one */
313 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
314 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
315 
316 	lockinit(&sc->sc_lock, "umoscom", 0, LK_CANRECURSE);
317 
318 	iface_index = UMOSCOM_IFACE_INDEX;
319 	error = usbd_transfer_setup(uaa->device, &iface_index,
320 	    sc->sc_xfer, umoscom_config_data,
321 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_lock);
322 
323 	if (error) {
324 		goto detach;
325 	}
326 	/* clear stall at first run */
327 	lockmgr(&sc->sc_lock, LK_EXCLUSIVE);
328 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
329 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
330 	lockmgr(&sc->sc_lock, LK_RELEASE);
331 
332 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
333 	    &umoscom_callback, &sc->sc_lock);
334 	if (error) {
335 		goto detach;
336 	}
337 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
338 
339 	return (0);
340 
341 detach:
342 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
343 	umoscom_detach(dev);
344 	return (ENXIO);
345 }
346 
347 static int
348 umoscom_detach(device_t dev)
349 {
350 	struct umoscom_softc *sc = device_get_softc(dev);
351 
352 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
353 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
354 	lockuninit(&sc->sc_lock);
355 
356 	return (0);
357 }
358 
359 static void
360 umoscom_cfg_open(struct ucom_softc *ucom)
361 {
362 	struct umoscom_softc *sc = ucom->sc_parent;
363 
364 	DPRINTF("\n");
365 
366 	/* Purge FIFOs or odd things happen */
367 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
368 
369 	/* Enable FIFO */
370 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
371 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
372 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
373 	    UMOSCOM_UART_REG);
374 
375 	/* Enable Interrupt Registers */
376 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
377 
378 	/* Magic */
379 	umoscom_cfg_write(sc, 0x01, 0x08);
380 
381 	/* Magic */
382 	umoscom_cfg_write(sc, 0x00, 0x02);
383 }
384 
385 static void
386 umoscom_cfg_close(struct ucom_softc *ucom)
387 {
388 	return;
389 }
390 
391 static void
392 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
393 {
394 	struct umoscom_softc *sc = ucom->sc_parent;
395 	uint16_t val;
396 
397 	val = sc->sc_lcr;
398 	if (onoff)
399 		val |= UMOSCOM_LCR_BREAK;
400 
401 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
402 }
403 
404 static void
405 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
406 {
407 	struct umoscom_softc *sc = ucom->sc_parent;
408 
409 	if (onoff)
410 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
411 	else
412 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
413 
414 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
415 }
416 
417 static void
418 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
419 {
420 	struct umoscom_softc *sc = ucom->sc_parent;
421 
422 	if (onoff)
423 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
424 	else
425 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
426 
427 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
428 }
429 
430 static int
431 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
432 {
433 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
434 		return (EINVAL);
435 
436 	return (0);
437 }
438 
439 static void
440 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
441 {
442 	struct umoscom_softc *sc = ucom->sc_parent;
443 	uint16_t data;
444 
445 	DPRINTF("speed=%d\n", t->c_ospeed);
446 
447 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
448 
449 	if (data == 0) {
450 		DPRINTF("invalid baud rate!\n");
451 		return;
452 	}
453 	umoscom_cfg_write(sc, UMOSCOM_LCR,
454 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
455 
456 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
457 	    (data & 0xFF) | UMOSCOM_UART_REG);
458 
459 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
460 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
461 
462 	if (t->c_cflag & CSTOPB)
463 		data = UMOSCOM_LCR_STOP_BITS_2;
464 	else
465 		data = UMOSCOM_LCR_STOP_BITS_1;
466 
467 	if (t->c_cflag & PARENB) {
468 		if (t->c_cflag & PARODD)
469 			data |= UMOSCOM_LCR_PARITY_ODD;
470 		else
471 			data |= UMOSCOM_LCR_PARITY_EVEN;
472 	} else
473 		data |= UMOSCOM_LCR_PARITY_NONE;
474 
475 	switch (t->c_cflag & CSIZE) {
476 	case CS5:
477 		data |= UMOSCOM_LCR_DBITS(5);
478 		break;
479 	case CS6:
480 		data |= UMOSCOM_LCR_DBITS(6);
481 		break;
482 	case CS7:
483 		data |= UMOSCOM_LCR_DBITS(7);
484 		break;
485 	case CS8:
486 		data |= UMOSCOM_LCR_DBITS(8);
487 		break;
488 	}
489 
490 	sc->sc_lcr = data;
491 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
492 }
493 
494 static void
495 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
496 {
497 	struct umoscom_softc *sc = ucom->sc_parent;
498 	uint8_t lsr;
499 	uint8_t msr;
500 
501 	DPRINTFN(5, "\n");
502 
503 	/* read status registers */
504 
505 	lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
506 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
507 
508 	/* translate bits */
509 
510 	if (msr & UMOSCOM_MSR_CTS)
511 		*p_msr |= SER_CTS;
512 
513 	if (msr & UMOSCOM_MSR_CD)
514 		*p_msr |= SER_DCD;
515 
516 	if (msr & UMOSCOM_MSR_RI)
517 		*p_msr |= SER_RI;
518 
519 	if (msr & UMOSCOM_MSR_RTS)
520 		*p_msr |= SER_DSR;
521 }
522 
523 static void
524 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
525 {
526 	struct usb_device_request req;
527 
528 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
529 	req.bRequest = UMOSCOM_WRITE;
530 	USETW(req.wValue, val);
531 	USETW(req.wIndex, reg);
532 	USETW(req.wLength, 0);
533 
534 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
535 	    &req, NULL, 0, 1000);
536 }
537 
538 static uint8_t
539 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
540 {
541 	struct usb_device_request req;
542 	uint8_t val;
543 
544 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
545 	req.bRequest = UMOSCOM_READ;
546 	USETW(req.wValue, 0);
547 	USETW(req.wIndex, reg);
548 	USETW(req.wLength, 1);
549 
550 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
551 	    &req, &val, 0, 1000);
552 
553 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
554 
555 	return (val);
556 }
557 
558 static void
559 umoscom_start_read(struct ucom_softc *ucom)
560 {
561 	struct umoscom_softc *sc = ucom->sc_parent;
562 
563 #if 0
564 	/* start interrupt endpoint */
565 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
566 #endif
567 	/* start read endpoint */
568 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
569 }
570 
571 static void
572 umoscom_stop_read(struct ucom_softc *ucom)
573 {
574 	struct umoscom_softc *sc = ucom->sc_parent;
575 
576 	/* stop interrupt transfer */
577 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
578 
579 	/* stop read endpoint */
580 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
581 }
582 
583 static void
584 umoscom_start_write(struct ucom_softc *ucom)
585 {
586 	struct umoscom_softc *sc = ucom->sc_parent;
587 
588 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
589 }
590 
591 static void
592 umoscom_stop_write(struct ucom_softc *ucom)
593 {
594 	struct umoscom_softc *sc = ucom->sc_parent;
595 
596 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
597 }
598 
599 static void
600 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
601 {
602 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
603 	struct usb_page_cache *pc;
604 	uint32_t actlen;
605 
606 	switch (USB_GET_STATE(xfer)) {
607 	case USB_ST_SETUP:
608 	case USB_ST_TRANSFERRED:
609 tr_setup:
610 		DPRINTF("\n");
611 
612 		pc = usbd_xfer_get_frame(xfer, 0);
613 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
614 		    UMOSCOM_BUFSIZE, &actlen)) {
615 
616 			usbd_xfer_set_frame_len(xfer, 0, actlen);
617 			usbd_transfer_submit(xfer);
618 		}
619 		return;
620 
621 	default:			/* Error */
622 		if (error != USB_ERR_CANCELLED) {
623 			DPRINTFN(0, "transfer failed\n");
624 			/* try to clear stall first */
625 			usbd_xfer_set_stall(xfer);
626 			goto tr_setup;
627 		}
628 		return;
629 	}
630 }
631 
632 static void
633 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
634 {
635 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
636 	struct usb_page_cache *pc;
637 	int actlen;
638 
639 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
640 
641 	switch (USB_GET_STATE(xfer)) {
642 	case USB_ST_TRANSFERRED:
643 		DPRINTF("got %d bytes\n", actlen);
644 		pc = usbd_xfer_get_frame(xfer, 0);
645 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
646 
647 	case USB_ST_SETUP:
648 tr_setup:
649 		DPRINTF("\n");
650 
651 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
652 		usbd_transfer_submit(xfer);
653 		return;
654 
655 	default:			/* Error */
656 		if (error != USB_ERR_CANCELLED) {
657 			DPRINTFN(0, "transfer failed\n");
658 			/* try to clear stall first */
659 			usbd_xfer_set_stall(xfer);
660 			goto tr_setup;
661 		}
662 		return;
663 	}
664 }
665 
666 static void
667 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
668 {
669 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
670 	int actlen;
671 
672 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
673 
674 	switch (USB_GET_STATE(xfer)) {
675 	case USB_ST_TRANSFERRED:
676 		if (actlen < 2) {
677 			DPRINTF("too short message\n");
678 			goto tr_setup;
679 		}
680 		ucom_status_change(&sc->sc_ucom);
681 
682 	case USB_ST_SETUP:
683 tr_setup:
684 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
685 		usbd_transfer_submit(xfer);
686 		return;
687 
688 	default:			/* Error */
689 		if (error != USB_ERR_CANCELLED) {
690 			DPRINTFN(0, "transfer failed\n");
691 			/* try to clear stall first */
692 			usbd_xfer_set_stall(xfer);
693 			goto tr_setup;
694 		}
695 		return;
696 	}
697 }
698 
699 static void
700 umoscom_poll(struct ucom_softc *ucom)
701 {
702 	struct umoscom_softc *sc = ucom->sc_parent;
703 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
704 }
705