xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision 9ccc37e32070303fb293a2a1697ffa71eeb49b25) 
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/module.h>
29 #include <sys/lock.h>
30 #include <sys/mutex.h>
31 #include <sys/condvar.h>
32 #include <sys/sysctl.h>
33 #include <sys/sx.h>
34 #include <sys/unistd.h>
35 #include <sys/callout.h>
36 #include <sys/malloc.h>
37 #include <sys/priv.h>
38 
39 #include <dev/usb/usb.h>
40 #include <dev/usb/usbdi.h>
41 #include <dev/usb/usbdi_util.h>
42 #include "usbdevs.h"
43 
44 #define	USB_DEBUG_VAR umoscom_debug
45 #include <dev/usb/usb_debug.h>
46 #include <dev/usb/usb_process.h>
47 
48 #include <dev/usb/serial/usb_serial.h>
49 
50 #ifdef USB_DEBUG
51 static int umoscom_debug = 0;
52 
53 static SYSCTL_NODE(_hw_usb, OID_AUTO, umoscom, CTLFLAG_RW, 0, "USB umoscom");
54 SYSCTL_INT(_hw_usb_umoscom, OID_AUTO, debug, CTLFLAG_RW,
55     &umoscom_debug, 0, "Debug level");
56 #endif
57 
58 #define	UMOSCOM_BUFSIZE	       1024	/* bytes */
59 
60 #define	UMOSCOM_CONFIG_INDEX	0
61 #define	UMOSCOM_IFACE_INDEX	0
62 
63 /* interrupt packet */
64 #define	UMOSCOM_IIR_RLS		0x06
65 #define	UMOSCOM_IIR_RDA		0x04
66 #define	UMOSCOM_IIR_CTI		0x0c
67 #define	UMOSCOM_IIR_THR		0x02
68 #define	UMOSCOM_IIR_MS		0x00
69 
70 /* registers */
71 #define	UMOSCOM_READ		0x0d
72 #define	UMOSCOM_WRITE		0x0e
73 #define	UMOSCOM_UART_REG	0x0300
74 #define	UMOSCOM_VEND_REG	0x0000
75 
76 #define	UMOSCOM_TXBUF		0x00	/* Write */
77 #define	UMOSCOM_RXBUF		0x00	/* Read */
78 #define	UMOSCOM_INT		0x01
79 #define	UMOSCOM_FIFO		0x02	/* Write */
80 #define	UMOSCOM_ISR		0x02	/* Read */
81 #define	UMOSCOM_LCR		0x03
82 #define	UMOSCOM_MCR		0x04
83 #define	UMOSCOM_LSR		0x05
84 #define	UMOSCOM_MSR		0x06
85 #define	UMOSCOM_SCRATCH		0x07
86 #define	UMOSCOM_DIV_LO		0x08
87 #define	UMOSCOM_DIV_HI		0x09
88 #define	UMOSCOM_EFR		0x0a
89 #define	UMOSCOM_XON1		0x0b
90 #define	UMOSCOM_XON2		0x0c
91 #define	UMOSCOM_XOFF1		0x0d
92 #define	UMOSCOM_XOFF2		0x0e
93 
94 #define	UMOSCOM_BAUDLO		0x00
95 #define	UMOSCOM_BAUDHI		0x01
96 
97 #define	UMOSCOM_INT_RXEN	0x01
98 #define	UMOSCOM_INT_TXEN	0x02
99 #define	UMOSCOM_INT_RSEN	0x04
100 #define	UMOSCOM_INT_MDMEM	0x08
101 #define	UMOSCOM_INT_SLEEP	0x10
102 #define	UMOSCOM_INT_XOFF	0x20
103 #define	UMOSCOM_INT_RTS		0x40
104 
105 #define	UMOSCOM_FIFO_EN		0x01
106 #define	UMOSCOM_FIFO_RXCLR	0x02
107 #define	UMOSCOM_FIFO_TXCLR	0x04
108 #define	UMOSCOM_FIFO_DMA_BLK	0x08
109 #define	UMOSCOM_FIFO_TXLVL_MASK	0x30
110 #define	UMOSCOM_FIFO_TXLVL_8	0x00
111 #define	UMOSCOM_FIFO_TXLVL_16	0x10
112 #define	UMOSCOM_FIFO_TXLVL_32	0x20
113 #define	UMOSCOM_FIFO_TXLVL_56	0x30
114 #define	UMOSCOM_FIFO_RXLVL_MASK	0xc0
115 #define	UMOSCOM_FIFO_RXLVL_8	0x00
116 #define	UMOSCOM_FIFO_RXLVL_16	0x40
117 #define	UMOSCOM_FIFO_RXLVL_56	0x80
118 #define	UMOSCOM_FIFO_RXLVL_80	0xc0
119 
120 #define	UMOSCOM_ISR_MDM		0x00
121 #define	UMOSCOM_ISR_NONE	0x01
122 #define	UMOSCOM_ISR_TX		0x02
123 #define	UMOSCOM_ISR_RX		0x04
124 #define	UMOSCOM_ISR_LINE	0x06
125 #define	UMOSCOM_ISR_RXTIMEOUT	0x0c
126 #define	UMOSCOM_ISR_RX_XOFF	0x10
127 #define	UMOSCOM_ISR_RTSCTS	0x20
128 #define	UMOSCOM_ISR_FIFOEN	0xc0
129 
130 #define	UMOSCOM_LCR_DBITS(x)	((x) - 5)
131 #define	UMOSCOM_LCR_STOP_BITS_1	0x00
132 #define	UMOSCOM_LCR_STOP_BITS_2	0x04	/* 2 if 6-8 bits/char or 1.5 if 5 */
133 #define	UMOSCOM_LCR_PARITY_NONE	0x00
134 #define	UMOSCOM_LCR_PARITY_ODD	0x08
135 #define	UMOSCOM_LCR_PARITY_EVEN	0x18
136 #define	UMOSCOM_LCR_BREAK	0x40
137 #define	UMOSCOM_LCR_DIVLATCH_EN	0x80
138 
139 #define	UMOSCOM_MCR_DTR		0x01
140 #define	UMOSCOM_MCR_RTS		0x02
141 #define	UMOSCOM_MCR_LOOP	0x04
142 #define	UMOSCOM_MCR_INTEN	0x08
143 #define	UMOSCOM_MCR_LOOPBACK	0x10
144 #define	UMOSCOM_MCR_XONANY	0x20
145 #define	UMOSCOM_MCR_IRDA_EN	0x40
146 #define	UMOSCOM_MCR_BAUD_DIV4	0x80
147 
148 #define	UMOSCOM_LSR_RXDATA	0x01
149 #define	UMOSCOM_LSR_RXOVER	0x02
150 #define	UMOSCOM_LSR_RXPAR_ERR	0x04
151 #define	UMOSCOM_LSR_RXFRM_ERR	0x08
152 #define	UMOSCOM_LSR_RXBREAK	0x10
153 #define	UMOSCOM_LSR_TXEMPTY	0x20
154 #define	UMOSCOM_LSR_TXALLEMPTY	0x40
155 #define	UMOSCOM_LSR_TXFIFO_ERR	0x80
156 
157 #define	UMOSCOM_MSR_CTS_CHG	0x01
158 #define	UMOSCOM_MSR_DSR_CHG	0x02
159 #define	UMOSCOM_MSR_RI_CHG	0x04
160 #define	UMOSCOM_MSR_CD_CHG	0x08
161 #define	UMOSCOM_MSR_CTS		0x10
162 #define	UMOSCOM_MSR_RTS		0x20
163 #define	UMOSCOM_MSR_RI		0x40
164 #define	UMOSCOM_MSR_CD		0x80
165 
166 #define	UMOSCOM_BAUD_REF	115200
167 
168 enum {
169 	UMOSCOM_BULK_DT_WR,
170 	UMOSCOM_BULK_DT_RD,
171 	UMOSCOM_INTR_DT_RD,
172 	UMOSCOM_N_TRANSFER,
173 };
174 
175 struct umoscom_softc {
176 	struct ucom_super_softc sc_super_ucom;
177 	struct ucom_softc sc_ucom;
178 
179 	struct usb_xfer *sc_xfer[UMOSCOM_N_TRANSFER];
180 	struct usb_device *sc_udev;
181 	struct mtx sc_mtx;
182 
183 	uint8_t	sc_mcr;
184 	uint8_t	sc_lcr;
185 };
186 
187 /* prototypes */
188 
189 static device_probe_t umoscom_probe;
190 static device_attach_t umoscom_attach;
191 static device_detach_t umoscom_detach;
192 
193 static usb_callback_t umoscom_write_callback;
194 static usb_callback_t umoscom_read_callback;
195 static usb_callback_t umoscom_intr_callback;
196 
197 static void	umoscom_cfg_open(struct ucom_softc *);
198 static void	umoscom_cfg_close(struct ucom_softc *);
199 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
200 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
201 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
202 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
203 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
204 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
205 		    uint8_t *);
206 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
207 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
208 static void	umoscom_start_read(struct ucom_softc *);
209 static void	umoscom_stop_read(struct ucom_softc *);
210 static void	umoscom_start_write(struct ucom_softc *);
211 static void	umoscom_stop_write(struct ucom_softc *);
212 static void	umoscom_poll(struct ucom_softc *ucom);
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 	.ucom_poll = &umoscom_poll,
261 };
262 
263 static device_method_t umoscom_methods[] = {
264 	DEVMETHOD(device_probe, umoscom_probe),
265 	DEVMETHOD(device_attach, umoscom_attach),
266 	DEVMETHOD(device_detach, umoscom_detach),
267 	{0, 0}
268 };
269 
270 static devclass_t umoscom_devclass;
271 
272 static driver_t umoscom_driver = {
273 	.name = "umoscom",
274 	.methods = umoscom_methods,
275 	.size = sizeof(struct umoscom_softc),
276 };
277 
278 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, 0);
279 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
280 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
281 MODULE_VERSION(umoscom, 1);
282 
283 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
284 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
285 };
286 
287 static int
288 umoscom_probe(device_t dev)
289 {
290 	struct usb_attach_arg *uaa = device_get_ivars(dev);
291 
292 	if (uaa->usb_mode != USB_MODE_HOST) {
293 		return (ENXIO);
294 	}
295 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
296 		return (ENXIO);
297 	}
298 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
299 		return (ENXIO);
300 	}
301 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
302 }
303 
304 static int
305 umoscom_attach(device_t dev)
306 {
307 	struct usb_attach_arg *uaa = device_get_ivars(dev);
308 	struct umoscom_softc *sc = device_get_softc(dev);
309 	int error;
310 	uint8_t iface_index;
311 
312 	sc->sc_udev = uaa->device;
313 	sc->sc_mcr = 0x08;		/* enable interrupts */
314 
315 	/* XXX the device doesn't provide any ID string, so set a static one */
316 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
317 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
318 
319 	mtx_init(&sc->sc_mtx, "umoscom", NULL, MTX_DEF);
320 
321 	iface_index = UMOSCOM_IFACE_INDEX;
322 	error = usbd_transfer_setup(uaa->device, &iface_index,
323 	    sc->sc_xfer, umoscom_config_data,
324 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
325 
326 	if (error) {
327 		goto detach;
328 	}
329 	/* clear stall at first run */
330 	mtx_lock(&sc->sc_mtx);
331 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
332 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
333 	mtx_unlock(&sc->sc_mtx);
334 
335 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
336 	    &umoscom_callback, &sc->sc_mtx);
337 	if (error) {
338 		goto detach;
339 	}
340 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
341 
342 	return (0);
343 
344 detach:
345 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
346 	umoscom_detach(dev);
347 	return (ENXIO);
348 }
349 
350 static int
351 umoscom_detach(device_t dev)
352 {
353 	struct umoscom_softc *sc = device_get_softc(dev);
354 
355 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
356 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
357 	mtx_destroy(&sc->sc_mtx);
358 
359 	return (0);
360 }
361 
362 static void
363 umoscom_cfg_open(struct ucom_softc *ucom)
364 {
365 	struct umoscom_softc *sc = ucom->sc_parent;
366 
367 	DPRINTF("\n");
368 
369 	/* Purge FIFOs or odd things happen */
370 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
371 
372 	/* Enable FIFO */
373 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
374 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
375 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
376 	    UMOSCOM_UART_REG);
377 
378 	/* Enable Interrupt Registers */
379 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
380 
381 	/* Magic */
382 	umoscom_cfg_write(sc, 0x01, 0x08);
383 
384 	/* Magic */
385 	umoscom_cfg_write(sc, 0x00, 0x02);
386 }
387 
388 static void
389 umoscom_cfg_close(struct ucom_softc *ucom)
390 {
391 	return;
392 }
393 
394 static void
395 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
396 {
397 	struct umoscom_softc *sc = ucom->sc_parent;
398 	uint16_t val;
399 
400 	val = sc->sc_lcr;
401 	if (onoff)
402 		val |= UMOSCOM_LCR_BREAK;
403 
404 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
405 }
406 
407 static void
408 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
409 {
410 	struct umoscom_softc *sc = ucom->sc_parent;
411 
412 	if (onoff)
413 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
414 	else
415 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
416 
417 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
418 }
419 
420 static void
421 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
422 {
423 	struct umoscom_softc *sc = ucom->sc_parent;
424 
425 	if (onoff)
426 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
427 	else
428 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
429 
430 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
431 }
432 
433 static int
434 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
435 {
436 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
437 		return (EINVAL);
438 
439 	return (0);
440 }
441 
442 static void
443 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
444 {
445 	struct umoscom_softc *sc = ucom->sc_parent;
446 	uint16_t data;
447 
448 	DPRINTF("speed=%d\n", t->c_ospeed);
449 
450 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
451 
452 	if (data == 0) {
453 		DPRINTF("invalid baud rate!\n");
454 		return;
455 	}
456 	umoscom_cfg_write(sc, UMOSCOM_LCR,
457 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
458 
459 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
460 	    (data & 0xFF) | UMOSCOM_UART_REG);
461 
462 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
463 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
464 
465 	if (t->c_cflag & CSTOPB)
466 		data = UMOSCOM_LCR_STOP_BITS_2;
467 	else
468 		data = UMOSCOM_LCR_STOP_BITS_1;
469 
470 	if (t->c_cflag & PARENB) {
471 		if (t->c_cflag & PARODD)
472 			data |= UMOSCOM_LCR_PARITY_ODD;
473 		else
474 			data |= UMOSCOM_LCR_PARITY_EVEN;
475 	} else
476 		data |= UMOSCOM_LCR_PARITY_NONE;
477 
478 	switch (t->c_cflag & CSIZE) {
479 	case CS5:
480 		data |= UMOSCOM_LCR_DBITS(5);
481 		break;
482 	case CS6:
483 		data |= UMOSCOM_LCR_DBITS(6);
484 		break;
485 	case CS7:
486 		data |= UMOSCOM_LCR_DBITS(7);
487 		break;
488 	case CS8:
489 		data |= UMOSCOM_LCR_DBITS(8);
490 		break;
491 	}
492 
493 	sc->sc_lcr = data;
494 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
495 }
496 
497 static void
498 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
499 {
500 	struct umoscom_softc *sc = ucom->sc_parent;
501 	uint8_t lsr;
502 	uint8_t msr;
503 
504 	DPRINTFN(5, "\n");
505 
506 	/* read status registers */
507 
508 	lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
509 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
510 
511 	/* translate bits */
512 
513 	if (msr & UMOSCOM_MSR_CTS)
514 		*p_msr |= SER_CTS;
515 
516 	if (msr & UMOSCOM_MSR_CD)
517 		*p_msr |= SER_DCD;
518 
519 	if (msr & UMOSCOM_MSR_RI)
520 		*p_msr |= SER_RI;
521 
522 	if (msr & UMOSCOM_MSR_RTS)
523 		*p_msr |= SER_DSR;
524 }
525 
526 static void
527 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
528 {
529 	struct usb_device_request req;
530 
531 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
532 	req.bRequest = UMOSCOM_WRITE;
533 	USETW(req.wValue, val);
534 	USETW(req.wIndex, reg);
535 	USETW(req.wLength, 0);
536 
537 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
538 	    &req, NULL, 0, 1000);
539 }
540 
541 static uint8_t
542 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
543 {
544 	struct usb_device_request req;
545 	uint8_t val;
546 
547 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
548 	req.bRequest = UMOSCOM_READ;
549 	USETW(req.wValue, 0);
550 	USETW(req.wIndex, reg);
551 	USETW(req.wLength, 1);
552 
553 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
554 	    &req, &val, 0, 1000);
555 
556 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
557 
558 	return (val);
559 }
560 
561 static void
562 umoscom_start_read(struct ucom_softc *ucom)
563 {
564 	struct umoscom_softc *sc = ucom->sc_parent;
565 
566 #if 0
567 	/* start interrupt endpoint */
568 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
569 #endif
570 	/* start read endpoint */
571 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
572 }
573 
574 static void
575 umoscom_stop_read(struct ucom_softc *ucom)
576 {
577 	struct umoscom_softc *sc = ucom->sc_parent;
578 
579 	/* stop interrupt transfer */
580 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
581 
582 	/* stop read endpoint */
583 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
584 }
585 
586 static void
587 umoscom_start_write(struct ucom_softc *ucom)
588 {
589 	struct umoscom_softc *sc = ucom->sc_parent;
590 
591 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
592 }
593 
594 static void
595 umoscom_stop_write(struct ucom_softc *ucom)
596 {
597 	struct umoscom_softc *sc = ucom->sc_parent;
598 
599 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
600 }
601 
602 static void
603 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
604 {
605 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
606 	struct usb_page_cache *pc;
607 	uint32_t actlen;
608 
609 	switch (USB_GET_STATE(xfer)) {
610 	case USB_ST_SETUP:
611 	case USB_ST_TRANSFERRED:
612 tr_setup:
613 		DPRINTF("\n");
614 
615 		pc = usbd_xfer_get_frame(xfer, 0);
616 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
617 		    UMOSCOM_BUFSIZE, &actlen)) {
618 
619 			usbd_xfer_set_frame_len(xfer, 0, actlen);
620 			usbd_transfer_submit(xfer);
621 		}
622 		return;
623 
624 	default:			/* Error */
625 		if (error != USB_ERR_CANCELLED) {
626 			DPRINTFN(0, "transfer failed\n");
627 			/* try to clear stall first */
628 			usbd_xfer_set_stall(xfer);
629 			goto tr_setup;
630 		}
631 		return;
632 	}
633 }
634 
635 static void
636 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
637 {
638 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
639 	struct usb_page_cache *pc;
640 	int actlen;
641 
642 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
643 
644 	switch (USB_GET_STATE(xfer)) {
645 	case USB_ST_TRANSFERRED:
646 		DPRINTF("got %d bytes\n", actlen);
647 		pc = usbd_xfer_get_frame(xfer, 0);
648 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
649 
650 	case USB_ST_SETUP:
651 tr_setup:
652 		DPRINTF("\n");
653 
654 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
655 		usbd_transfer_submit(xfer);
656 		return;
657 
658 	default:			/* Error */
659 		if (error != USB_ERR_CANCELLED) {
660 			DPRINTFN(0, "transfer failed\n");
661 			/* try to clear stall first */
662 			usbd_xfer_set_stall(xfer);
663 			goto tr_setup;
664 		}
665 		return;
666 	}
667 }
668 
669 static void
670 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
671 {
672 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
673 	int actlen;
674 
675 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
676 
677 	switch (USB_GET_STATE(xfer)) {
678 	case USB_ST_TRANSFERRED:
679 		if (actlen < 2) {
680 			DPRINTF("too short message\n");
681 			goto tr_setup;
682 		}
683 		ucom_status_change(&sc->sc_ucom);
684 
685 	case USB_ST_SETUP:
686 tr_setup:
687 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
688 		usbd_transfer_submit(xfer);
689 		return;
690 
691 	default:			/* Error */
692 		if (error != USB_ERR_CANCELLED) {
693 			DPRINTFN(0, "transfer failed\n");
694 			/* try to clear stall first */
695 			usbd_xfer_set_stall(xfer);
696 			goto tr_setup;
697 		}
698 		return;
699 	}
700 }
701 
702 static void
703 umoscom_poll(struct ucom_softc *ucom)
704 {
705 	struct umoscom_softc *sc = ucom->sc_parent;
706 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
707 }
708