xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision 076ad2f8) 
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_RWTUN,
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 static void umoscom_free_softc(struct umoscom_softc *);
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_free(struct ucom_softc *);
199 static void	umoscom_cfg_open(struct ucom_softc *);
200 static void	umoscom_cfg_close(struct ucom_softc *);
201 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
202 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
203 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
204 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
205 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
206 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
207 		    uint8_t *);
208 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
209 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
210 static void	umoscom_start_read(struct ucom_softc *);
211 static void	umoscom_stop_read(struct ucom_softc *);
212 static void	umoscom_start_write(struct ucom_softc *);
213 static void	umoscom_stop_write(struct ucom_softc *);
214 static void	umoscom_poll(struct ucom_softc *ucom);
215 
216 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
217 
218 	[UMOSCOM_BULK_DT_WR] = {
219 		.type = UE_BULK,
220 		.endpoint = UE_ADDR_ANY,
221 		.direction = UE_DIR_OUT,
222 		.bufsize = UMOSCOM_BUFSIZE,
223 		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
224 		.callback = &umoscom_write_callback,
225 	},
226 
227 	[UMOSCOM_BULK_DT_RD] = {
228 		.type = UE_BULK,
229 		.endpoint = UE_ADDR_ANY,
230 		.direction = UE_DIR_IN,
231 		.bufsize = UMOSCOM_BUFSIZE,
232 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
233 		.callback = &umoscom_read_callback,
234 	},
235 
236 	[UMOSCOM_INTR_DT_RD] = {
237 		.type = UE_INTERRUPT,
238 		.endpoint = UE_ADDR_ANY,
239 		.direction = UE_DIR_IN,
240 		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
241 		.bufsize = 0,	/* use wMaxPacketSize */
242 		.callback = &umoscom_intr_callback,
243 	},
244 };
245 
246 static const struct ucom_callback umoscom_callback = {
247 	/* configuration callbacks */
248 	.ucom_cfg_get_status = &umoscom_cfg_get_status,
249 	.ucom_cfg_set_dtr = &umoscom_cfg_set_dtr,
250 	.ucom_cfg_set_rts = &umoscom_cfg_set_rts,
251 	.ucom_cfg_set_break = &umoscom_cfg_set_break,
252 	.ucom_cfg_param = &umoscom_cfg_param,
253 	.ucom_cfg_open = &umoscom_cfg_open,
254 	.ucom_cfg_close = &umoscom_cfg_close,
255 
256 	/* other callbacks */
257 	.ucom_pre_param = &umoscom_pre_param,
258 	.ucom_start_read = &umoscom_start_read,
259 	.ucom_stop_read = &umoscom_stop_read,
260 	.ucom_start_write = &umoscom_start_write,
261 	.ucom_stop_write = &umoscom_stop_write,
262 	.ucom_poll = &umoscom_poll,
263 	.ucom_free = &umoscom_free,
264 };
265 
266 static device_method_t umoscom_methods[] = {
267 	DEVMETHOD(device_probe, umoscom_probe),
268 	DEVMETHOD(device_attach, umoscom_attach),
269 	DEVMETHOD(device_detach, umoscom_detach),
270 	DEVMETHOD_END
271 };
272 
273 static devclass_t umoscom_devclass;
274 
275 static driver_t umoscom_driver = {
276 	.name = "umoscom",
277 	.methods = umoscom_methods,
278 	.size = sizeof(struct umoscom_softc),
279 };
280 
281 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
282 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
283 };
284 
285 DRIVER_MODULE(umoscom, uhub, umoscom_driver, umoscom_devclass, NULL, 0);
286 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
287 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
288 MODULE_VERSION(umoscom, 1);
289 USB_PNP_HOST_INFO(umoscom_devs);
290 
291 static int
292 umoscom_probe(device_t dev)
293 {
294 	struct usb_attach_arg *uaa = device_get_ivars(dev);
295 
296 	if (uaa->usb_mode != USB_MODE_HOST) {
297 		return (ENXIO);
298 	}
299 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
300 		return (ENXIO);
301 	}
302 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
303 		return (ENXIO);
304 	}
305 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
306 }
307 
308 static int
309 umoscom_attach(device_t dev)
310 {
311 	struct usb_attach_arg *uaa = device_get_ivars(dev);
312 	struct umoscom_softc *sc = device_get_softc(dev);
313 	int error;
314 	uint8_t iface_index;
315 
316 	sc->sc_udev = uaa->device;
317 	sc->sc_mcr = 0x08;		/* enable interrupts */
318 
319 	/* XXX the device doesn't provide any ID string, so set a static one */
320 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
321 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
322 
323 	mtx_init(&sc->sc_mtx, "umoscom", NULL, MTX_DEF);
324 	ucom_ref(&sc->sc_super_ucom);
325 
326 	iface_index = UMOSCOM_IFACE_INDEX;
327 	error = usbd_transfer_setup(uaa->device, &iface_index,
328 	    sc->sc_xfer, umoscom_config_data,
329 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
330 
331 	if (error) {
332 		goto detach;
333 	}
334 	/* clear stall at first run */
335 	mtx_lock(&sc->sc_mtx);
336 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
337 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
338 	mtx_unlock(&sc->sc_mtx);
339 
340 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
341 	    &umoscom_callback, &sc->sc_mtx);
342 	if (error) {
343 		goto detach;
344 	}
345 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
346 
347 	return (0);
348 
349 detach:
350 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
351 	umoscom_detach(dev);
352 	return (ENXIO);
353 }
354 
355 static int
356 umoscom_detach(device_t dev)
357 {
358 	struct umoscom_softc *sc = device_get_softc(dev);
359 
360 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
361 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
362 
363 	device_claim_softc(dev);
364 
365 	umoscom_free_softc(sc);
366 
367 	return (0);
368 }
369 
370 UCOM_UNLOAD_DRAIN(umoscom);
371 
372 static void
373 umoscom_free_softc(struct umoscom_softc *sc)
374 {
375 	if (ucom_unref(&sc->sc_super_ucom)) {
376 		mtx_destroy(&sc->sc_mtx);
377 		device_free_softc(sc);
378 	}
379 }
380 
381 static void
382 umoscom_free(struct ucom_softc *ucom)
383 {
384 	umoscom_free_softc(ucom->sc_parent);
385 }
386 
387 static void
388 umoscom_cfg_open(struct ucom_softc *ucom)
389 {
390 	struct umoscom_softc *sc = ucom->sc_parent;
391 
392 	DPRINTF("\n");
393 
394 	/* Purge FIFOs or odd things happen */
395 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
396 
397 	/* Enable FIFO */
398 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
399 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
400 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
401 	    UMOSCOM_UART_REG);
402 
403 	/* Enable Interrupt Registers */
404 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
405 
406 	/* Magic */
407 	umoscom_cfg_write(sc, 0x01, 0x08);
408 
409 	/* Magic */
410 	umoscom_cfg_write(sc, 0x00, 0x02);
411 }
412 
413 static void
414 umoscom_cfg_close(struct ucom_softc *ucom)
415 {
416 	return;
417 }
418 
419 static void
420 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
421 {
422 	struct umoscom_softc *sc = ucom->sc_parent;
423 	uint16_t val;
424 
425 	val = sc->sc_lcr;
426 	if (onoff)
427 		val |= UMOSCOM_LCR_BREAK;
428 
429 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
430 }
431 
432 static void
433 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
434 {
435 	struct umoscom_softc *sc = ucom->sc_parent;
436 
437 	if (onoff)
438 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
439 	else
440 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
441 
442 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
443 }
444 
445 static void
446 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
447 {
448 	struct umoscom_softc *sc = ucom->sc_parent;
449 
450 	if (onoff)
451 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
452 	else
453 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
454 
455 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
456 }
457 
458 static int
459 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
460 {
461 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
462 		return (EINVAL);
463 
464 	return (0);
465 }
466 
467 static void
468 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
469 {
470 	struct umoscom_softc *sc = ucom->sc_parent;
471 	uint16_t data;
472 
473 	DPRINTF("speed=%d\n", t->c_ospeed);
474 
475 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
476 
477 	if (data == 0) {
478 		DPRINTF("invalid baud rate!\n");
479 		return;
480 	}
481 	umoscom_cfg_write(sc, UMOSCOM_LCR,
482 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
483 
484 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
485 	    (data & 0xFF) | UMOSCOM_UART_REG);
486 
487 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
488 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
489 
490 	if (t->c_cflag & CSTOPB)
491 		data = UMOSCOM_LCR_STOP_BITS_2;
492 	else
493 		data = UMOSCOM_LCR_STOP_BITS_1;
494 
495 	if (t->c_cflag & PARENB) {
496 		if (t->c_cflag & PARODD)
497 			data |= UMOSCOM_LCR_PARITY_ODD;
498 		else
499 			data |= UMOSCOM_LCR_PARITY_EVEN;
500 	} else
501 		data |= UMOSCOM_LCR_PARITY_NONE;
502 
503 	switch (t->c_cflag & CSIZE) {
504 	case CS5:
505 		data |= UMOSCOM_LCR_DBITS(5);
506 		break;
507 	case CS6:
508 		data |= UMOSCOM_LCR_DBITS(6);
509 		break;
510 	case CS7:
511 		data |= UMOSCOM_LCR_DBITS(7);
512 		break;
513 	case CS8:
514 		data |= UMOSCOM_LCR_DBITS(8);
515 		break;
516 	}
517 
518 	sc->sc_lcr = data;
519 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
520 }
521 
522 static void
523 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
524 {
525 	struct umoscom_softc *sc = ucom->sc_parent;
526 	uint8_t msr;
527 
528 	DPRINTFN(5, "\n");
529 
530 	/*
531 	 * Read status registers.  MSR bits need translation from ns16550 to
532 	 * SER_* values.  LSR bits are ns16550 in hardware and ucom.
533 	 */
534 
535 	*p_lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
536 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
537 
538 	/* translate bits */
539 
540 	if (msr & UMOSCOM_MSR_CTS)
541 		*p_msr |= SER_CTS;
542 
543 	if (msr & UMOSCOM_MSR_CD)
544 		*p_msr |= SER_DCD;
545 
546 	if (msr & UMOSCOM_MSR_RI)
547 		*p_msr |= SER_RI;
548 
549 	if (msr & UMOSCOM_MSR_RTS)
550 		*p_msr |= SER_DSR;
551 }
552 
553 static void
554 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
555 {
556 	struct usb_device_request req;
557 
558 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
559 	req.bRequest = UMOSCOM_WRITE;
560 	USETW(req.wValue, val);
561 	USETW(req.wIndex, reg);
562 	USETW(req.wLength, 0);
563 
564 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
565 	    &req, NULL, 0, 1000);
566 }
567 
568 static uint8_t
569 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
570 {
571 	struct usb_device_request req;
572 	uint8_t val;
573 
574 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
575 	req.bRequest = UMOSCOM_READ;
576 	USETW(req.wValue, 0);
577 	USETW(req.wIndex, reg);
578 	USETW(req.wLength, 1);
579 
580 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
581 	    &req, &val, 0, 1000);
582 
583 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
584 
585 	return (val);
586 }
587 
588 static void
589 umoscom_start_read(struct ucom_softc *ucom)
590 {
591 	struct umoscom_softc *sc = ucom->sc_parent;
592 
593 #if 0
594 	/* start interrupt endpoint */
595 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
596 #endif
597 	/* start read endpoint */
598 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
599 }
600 
601 static void
602 umoscom_stop_read(struct ucom_softc *ucom)
603 {
604 	struct umoscom_softc *sc = ucom->sc_parent;
605 
606 	/* stop interrupt transfer */
607 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
608 
609 	/* stop read endpoint */
610 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
611 }
612 
613 static void
614 umoscom_start_write(struct ucom_softc *ucom)
615 {
616 	struct umoscom_softc *sc = ucom->sc_parent;
617 
618 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
619 }
620 
621 static void
622 umoscom_stop_write(struct ucom_softc *ucom)
623 {
624 	struct umoscom_softc *sc = ucom->sc_parent;
625 
626 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
627 }
628 
629 static void
630 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
631 {
632 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
633 	struct usb_page_cache *pc;
634 	uint32_t actlen;
635 
636 	switch (USB_GET_STATE(xfer)) {
637 	case USB_ST_SETUP:
638 	case USB_ST_TRANSFERRED:
639 tr_setup:
640 		DPRINTF("\n");
641 
642 		pc = usbd_xfer_get_frame(xfer, 0);
643 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
644 		    UMOSCOM_BUFSIZE, &actlen)) {
645 
646 			usbd_xfer_set_frame_len(xfer, 0, actlen);
647 			usbd_transfer_submit(xfer);
648 		}
649 		return;
650 
651 	default:			/* Error */
652 		if (error != USB_ERR_CANCELLED) {
653 			DPRINTFN(0, "transfer failed\n");
654 			/* try to clear stall first */
655 			usbd_xfer_set_stall(xfer);
656 			goto tr_setup;
657 		}
658 		return;
659 	}
660 }
661 
662 static void
663 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
664 {
665 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
666 	struct usb_page_cache *pc;
667 	int actlen;
668 
669 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
670 
671 	switch (USB_GET_STATE(xfer)) {
672 	case USB_ST_TRANSFERRED:
673 		DPRINTF("got %d bytes\n", actlen);
674 		pc = usbd_xfer_get_frame(xfer, 0);
675 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
676 
677 	case USB_ST_SETUP:
678 tr_setup:
679 		DPRINTF("\n");
680 
681 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
682 		usbd_transfer_submit(xfer);
683 		return;
684 
685 	default:			/* Error */
686 		if (error != USB_ERR_CANCELLED) {
687 			DPRINTFN(0, "transfer failed\n");
688 			/* try to clear stall first */
689 			usbd_xfer_set_stall(xfer);
690 			goto tr_setup;
691 		}
692 		return;
693 	}
694 }
695 
696 static void
697 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
698 {
699 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
700 	int actlen;
701 
702 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
703 
704 	switch (USB_GET_STATE(xfer)) {
705 	case USB_ST_TRANSFERRED:
706 		if (actlen < 2) {
707 			DPRINTF("too short message\n");
708 			goto tr_setup;
709 		}
710 		ucom_status_change(&sc->sc_ucom);
711 
712 	case USB_ST_SETUP:
713 tr_setup:
714 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
715 		usbd_transfer_submit(xfer);
716 		return;
717 
718 	default:			/* Error */
719 		if (error != USB_ERR_CANCELLED) {
720 			DPRINTFN(0, "transfer failed\n");
721 			/* try to clear stall first */
722 			usbd_xfer_set_stall(xfer);
723 			goto tr_setup;
724 		}
725 		return;
726 	}
727 }
728 
729 static void
730 umoscom_poll(struct ucom_softc *ucom)
731 {
732 	struct umoscom_softc *sc = ucom->sc_parent;
733 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
734 }
735