xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision 5ca8e32633c4ffbbcd6762e5888b6a4ba0708c6c) 
1 /*	$OpenBSD: umoscom.c,v 1.2 2006/10/26 06:02:43 jsg Exp $	*/
2 
3 /*
4  * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <sys/stdint.h>
20 #include <sys/stddef.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/mutex.h>
30 #include <sys/condvar.h>
31 #include <sys/sysctl.h>
32 #include <sys/sx.h>
33 #include <sys/unistd.h>
34 #include <sys/callout.h>
35 #include <sys/malloc.h>
36 #include <sys/priv.h>
37 
38 #include <dev/usb/usb.h>
39 #include <dev/usb/usbdi.h>
40 #include <dev/usb/usbdi_util.h>
41 #include "usbdevs.h"
42 
43 #define	USB_DEBUG_VAR umoscom_debug
44 #include <dev/usb/usb_debug.h>
45 #include <dev/usb/usb_process.h>
46 
47 #include <dev/usb/serial/usb_serial.h>
48 
49 #ifdef USB_DEBUG
50 static int umoscom_debug = 0;
51 
52 static SYSCTL_NODE(_hw_usb, OID_AUTO, umoscom, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
53     "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 	[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 	.ucom_free = &umoscom_free,
263 };
264 
265 static device_method_t umoscom_methods[] = {
266 	DEVMETHOD(device_probe, umoscom_probe),
267 	DEVMETHOD(device_attach, umoscom_attach),
268 	DEVMETHOD(device_detach, umoscom_detach),
269 	DEVMETHOD_END
270 };
271 
272 static driver_t umoscom_driver = {
273 	.name = "umoscom",
274 	.methods = umoscom_methods,
275 	.size = sizeof(struct umoscom_softc),
276 };
277 
278 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
279 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
280 };
281 
282 DRIVER_MODULE(umoscom, uhub, umoscom_driver, NULL, NULL);
283 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
284 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
285 MODULE_VERSION(umoscom, 1);
286 USB_PNP_HOST_INFO(umoscom_devs);
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 	ucom_ref(&sc->sc_super_ucom);
322 
323 	iface_index = UMOSCOM_IFACE_INDEX;
324 	error = usbd_transfer_setup(uaa->device, &iface_index,
325 	    sc->sc_xfer, umoscom_config_data,
326 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
327 
328 	if (error) {
329 		goto detach;
330 	}
331 	/* clear stall at first run */
332 	mtx_lock(&sc->sc_mtx);
333 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
334 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
335 	mtx_unlock(&sc->sc_mtx);
336 
337 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
338 	    &umoscom_callback, &sc->sc_mtx);
339 	if (error) {
340 		goto detach;
341 	}
342 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
343 
344 	return (0);
345 
346 detach:
347 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
348 	umoscom_detach(dev);
349 	return (ENXIO);
350 }
351 
352 static int
353 umoscom_detach(device_t dev)
354 {
355 	struct umoscom_softc *sc = device_get_softc(dev);
356 
357 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
358 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
359 
360 	device_claim_softc(dev);
361 
362 	umoscom_free_softc(sc);
363 
364 	return (0);
365 }
366 
367 UCOM_UNLOAD_DRAIN(umoscom);
368 
369 static void
370 umoscom_free_softc(struct umoscom_softc *sc)
371 {
372 	if (ucom_unref(&sc->sc_super_ucom)) {
373 		mtx_destroy(&sc->sc_mtx);
374 		device_free_softc(sc);
375 	}
376 }
377 
378 static void
379 umoscom_free(struct ucom_softc *ucom)
380 {
381 	umoscom_free_softc(ucom->sc_parent);
382 }
383 
384 static void
385 umoscom_cfg_open(struct ucom_softc *ucom)
386 {
387 	struct umoscom_softc *sc = ucom->sc_parent;
388 
389 	DPRINTF("\n");
390 
391 	/* Purge FIFOs or odd things happen */
392 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
393 
394 	/* Enable FIFO */
395 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
396 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
397 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
398 	    UMOSCOM_UART_REG);
399 
400 	/* Enable Interrupt Registers */
401 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
402 
403 	/* Magic */
404 	umoscom_cfg_write(sc, 0x01, 0x08);
405 
406 	/* Magic */
407 	umoscom_cfg_write(sc, 0x00, 0x02);
408 }
409 
410 static void
411 umoscom_cfg_close(struct ucom_softc *ucom)
412 {
413 	return;
414 }
415 
416 static void
417 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
418 {
419 	struct umoscom_softc *sc = ucom->sc_parent;
420 	uint16_t val;
421 
422 	val = sc->sc_lcr;
423 	if (onoff)
424 		val |= UMOSCOM_LCR_BREAK;
425 
426 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
427 }
428 
429 static void
430 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
431 {
432 	struct umoscom_softc *sc = ucom->sc_parent;
433 
434 	if (onoff)
435 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
436 	else
437 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
438 
439 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
440 }
441 
442 static void
443 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
444 {
445 	struct umoscom_softc *sc = ucom->sc_parent;
446 
447 	if (onoff)
448 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
449 	else
450 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
451 
452 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
453 }
454 
455 static int
456 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
457 {
458 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
459 		return (EINVAL);
460 
461 	return (0);
462 }
463 
464 static void
465 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
466 {
467 	struct umoscom_softc *sc = ucom->sc_parent;
468 	uint16_t data;
469 
470 	DPRINTF("speed=%d\n", t->c_ospeed);
471 
472 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
473 
474 	if (data == 0) {
475 		DPRINTF("invalid baud rate!\n");
476 		return;
477 	}
478 	umoscom_cfg_write(sc, UMOSCOM_LCR,
479 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
480 
481 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
482 	    (data & 0xFF) | UMOSCOM_UART_REG);
483 
484 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
485 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
486 
487 	if (t->c_cflag & CSTOPB)
488 		data = UMOSCOM_LCR_STOP_BITS_2;
489 	else
490 		data = UMOSCOM_LCR_STOP_BITS_1;
491 
492 	if (t->c_cflag & PARENB) {
493 		if (t->c_cflag & PARODD)
494 			data |= UMOSCOM_LCR_PARITY_ODD;
495 		else
496 			data |= UMOSCOM_LCR_PARITY_EVEN;
497 	} else
498 		data |= UMOSCOM_LCR_PARITY_NONE;
499 
500 	switch (t->c_cflag & CSIZE) {
501 	case CS5:
502 		data |= UMOSCOM_LCR_DBITS(5);
503 		break;
504 	case CS6:
505 		data |= UMOSCOM_LCR_DBITS(6);
506 		break;
507 	case CS7:
508 		data |= UMOSCOM_LCR_DBITS(7);
509 		break;
510 	case CS8:
511 		data |= UMOSCOM_LCR_DBITS(8);
512 		break;
513 	}
514 
515 	sc->sc_lcr = data;
516 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
517 }
518 
519 static void
520 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
521 {
522 	struct umoscom_softc *sc = ucom->sc_parent;
523 	uint8_t msr;
524 
525 	DPRINTFN(5, "\n");
526 
527 	/*
528 	 * Read status registers.  MSR bits need translation from ns16550 to
529 	 * SER_* values.  LSR bits are ns16550 in hardware and ucom.
530 	 */
531 
532 	*p_lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
533 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
534 
535 	/* translate bits */
536 
537 	if (msr & UMOSCOM_MSR_CTS)
538 		*p_msr |= SER_CTS;
539 
540 	if (msr & UMOSCOM_MSR_CD)
541 		*p_msr |= SER_DCD;
542 
543 	if (msr & UMOSCOM_MSR_RI)
544 		*p_msr |= SER_RI;
545 
546 	if (msr & UMOSCOM_MSR_RTS)
547 		*p_msr |= SER_DSR;
548 }
549 
550 static void
551 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
552 {
553 	struct usb_device_request req;
554 
555 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
556 	req.bRequest = UMOSCOM_WRITE;
557 	USETW(req.wValue, val);
558 	USETW(req.wIndex, reg);
559 	USETW(req.wLength, 0);
560 
561 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
562 	    &req, NULL, 0, 1000);
563 }
564 
565 static uint8_t
566 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
567 {
568 	struct usb_device_request req;
569 	uint8_t val;
570 
571 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
572 	req.bRequest = UMOSCOM_READ;
573 	USETW(req.wValue, 0);
574 	USETW(req.wIndex, reg);
575 	USETW(req.wLength, 1);
576 
577 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
578 	    &req, &val, 0, 1000);
579 
580 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
581 
582 	return (val);
583 }
584 
585 static void
586 umoscom_start_read(struct ucom_softc *ucom)
587 {
588 	struct umoscom_softc *sc = ucom->sc_parent;
589 
590 #if 0
591 	/* start interrupt endpoint */
592 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
593 #endif
594 	/* start read endpoint */
595 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
596 }
597 
598 static void
599 umoscom_stop_read(struct ucom_softc *ucom)
600 {
601 	struct umoscom_softc *sc = ucom->sc_parent;
602 
603 	/* stop interrupt transfer */
604 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
605 
606 	/* stop read endpoint */
607 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
608 }
609 
610 static void
611 umoscom_start_write(struct ucom_softc *ucom)
612 {
613 	struct umoscom_softc *sc = ucom->sc_parent;
614 
615 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
616 }
617 
618 static void
619 umoscom_stop_write(struct ucom_softc *ucom)
620 {
621 	struct umoscom_softc *sc = ucom->sc_parent;
622 
623 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
624 }
625 
626 static void
627 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
628 {
629 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
630 	struct usb_page_cache *pc;
631 	uint32_t actlen;
632 
633 	switch (USB_GET_STATE(xfer)) {
634 	case USB_ST_SETUP:
635 	case USB_ST_TRANSFERRED:
636 tr_setup:
637 		DPRINTF("\n");
638 
639 		pc = usbd_xfer_get_frame(xfer, 0);
640 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
641 		    UMOSCOM_BUFSIZE, &actlen)) {
642 			usbd_xfer_set_frame_len(xfer, 0, actlen);
643 			usbd_transfer_submit(xfer);
644 		}
645 		return;
646 
647 	default:			/* Error */
648 		if (error != USB_ERR_CANCELLED) {
649 			DPRINTFN(0, "transfer failed\n");
650 			/* try to clear stall first */
651 			usbd_xfer_set_stall(xfer);
652 			goto tr_setup;
653 		}
654 		return;
655 	}
656 }
657 
658 static void
659 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
660 {
661 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
662 	struct usb_page_cache *pc;
663 	int actlen;
664 
665 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
666 
667 	switch (USB_GET_STATE(xfer)) {
668 	case USB_ST_TRANSFERRED:
669 		DPRINTF("got %d bytes\n", actlen);
670 		pc = usbd_xfer_get_frame(xfer, 0);
671 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
672 
673 	case USB_ST_SETUP:
674 tr_setup:
675 		DPRINTF("\n");
676 
677 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
678 		usbd_transfer_submit(xfer);
679 		return;
680 
681 	default:			/* Error */
682 		if (error != USB_ERR_CANCELLED) {
683 			DPRINTFN(0, "transfer failed\n");
684 			/* try to clear stall first */
685 			usbd_xfer_set_stall(xfer);
686 			goto tr_setup;
687 		}
688 		return;
689 	}
690 }
691 
692 static void
693 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
694 {
695 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
696 	int actlen;
697 
698 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
699 
700 	switch (USB_GET_STATE(xfer)) {
701 	case USB_ST_TRANSFERRED:
702 		if (actlen < 2) {
703 			DPRINTF("too short message\n");
704 			goto tr_setup;
705 		}
706 		ucom_status_change(&sc->sc_ucom);
707 
708 	case USB_ST_SETUP:
709 tr_setup:
710 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
711 		usbd_transfer_submit(xfer);
712 		return;
713 
714 	default:			/* Error */
715 		if (error != USB_ERR_CANCELLED) {
716 			DPRINTFN(0, "transfer failed\n");
717 			/* try to clear stall first */
718 			usbd_xfer_set_stall(xfer);
719 			goto tr_setup;
720 		}
721 		return;
722 	}
723 }
724 
725 static void
726 umoscom_poll(struct ucom_softc *ucom)
727 {
728 	struct umoscom_softc *sc = ucom->sc_parent;
729 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
730 }
731