xref: /freebsd/sys/dev/usb/serial/umoscom.c (revision 8bab661a3316d8bd9b9fbd11a3b4371b91507bd2) 
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 | CTLFLAG_MPSAFE, 0,
54     "USB umoscom");
55 SYSCTL_INT(_hw_usb_umoscom, OID_AUTO, debug, CTLFLAG_RWTUN,
56     &umoscom_debug, 0, "Debug level");
57 #endif
58 
59 #define	UMOSCOM_BUFSIZE	       1024	/* bytes */
60 
61 #define	UMOSCOM_CONFIG_INDEX	0
62 #define	UMOSCOM_IFACE_INDEX	0
63 
64 /* interrupt packet */
65 #define	UMOSCOM_IIR_RLS		0x06
66 #define	UMOSCOM_IIR_RDA		0x04
67 #define	UMOSCOM_IIR_CTI		0x0c
68 #define	UMOSCOM_IIR_THR		0x02
69 #define	UMOSCOM_IIR_MS		0x00
70 
71 /* registers */
72 #define	UMOSCOM_READ		0x0d
73 #define	UMOSCOM_WRITE		0x0e
74 #define	UMOSCOM_UART_REG	0x0300
75 #define	UMOSCOM_VEND_REG	0x0000
76 
77 #define	UMOSCOM_TXBUF		0x00	/* Write */
78 #define	UMOSCOM_RXBUF		0x00	/* Read */
79 #define	UMOSCOM_INT		0x01
80 #define	UMOSCOM_FIFO		0x02	/* Write */
81 #define	UMOSCOM_ISR		0x02	/* Read */
82 #define	UMOSCOM_LCR		0x03
83 #define	UMOSCOM_MCR		0x04
84 #define	UMOSCOM_LSR		0x05
85 #define	UMOSCOM_MSR		0x06
86 #define	UMOSCOM_SCRATCH		0x07
87 #define	UMOSCOM_DIV_LO		0x08
88 #define	UMOSCOM_DIV_HI		0x09
89 #define	UMOSCOM_EFR		0x0a
90 #define	UMOSCOM_XON1		0x0b
91 #define	UMOSCOM_XON2		0x0c
92 #define	UMOSCOM_XOFF1		0x0d
93 #define	UMOSCOM_XOFF2		0x0e
94 
95 #define	UMOSCOM_BAUDLO		0x00
96 #define	UMOSCOM_BAUDHI		0x01
97 
98 #define	UMOSCOM_INT_RXEN	0x01
99 #define	UMOSCOM_INT_TXEN	0x02
100 #define	UMOSCOM_INT_RSEN	0x04
101 #define	UMOSCOM_INT_MDMEM	0x08
102 #define	UMOSCOM_INT_SLEEP	0x10
103 #define	UMOSCOM_INT_XOFF	0x20
104 #define	UMOSCOM_INT_RTS		0x40
105 
106 #define	UMOSCOM_FIFO_EN		0x01
107 #define	UMOSCOM_FIFO_RXCLR	0x02
108 #define	UMOSCOM_FIFO_TXCLR	0x04
109 #define	UMOSCOM_FIFO_DMA_BLK	0x08
110 #define	UMOSCOM_FIFO_TXLVL_MASK	0x30
111 #define	UMOSCOM_FIFO_TXLVL_8	0x00
112 #define	UMOSCOM_FIFO_TXLVL_16	0x10
113 #define	UMOSCOM_FIFO_TXLVL_32	0x20
114 #define	UMOSCOM_FIFO_TXLVL_56	0x30
115 #define	UMOSCOM_FIFO_RXLVL_MASK	0xc0
116 #define	UMOSCOM_FIFO_RXLVL_8	0x00
117 #define	UMOSCOM_FIFO_RXLVL_16	0x40
118 #define	UMOSCOM_FIFO_RXLVL_56	0x80
119 #define	UMOSCOM_FIFO_RXLVL_80	0xc0
120 
121 #define	UMOSCOM_ISR_MDM		0x00
122 #define	UMOSCOM_ISR_NONE	0x01
123 #define	UMOSCOM_ISR_TX		0x02
124 #define	UMOSCOM_ISR_RX		0x04
125 #define	UMOSCOM_ISR_LINE	0x06
126 #define	UMOSCOM_ISR_RXTIMEOUT	0x0c
127 #define	UMOSCOM_ISR_RX_XOFF	0x10
128 #define	UMOSCOM_ISR_RTSCTS	0x20
129 #define	UMOSCOM_ISR_FIFOEN	0xc0
130 
131 #define	UMOSCOM_LCR_DBITS(x)	((x) - 5)
132 #define	UMOSCOM_LCR_STOP_BITS_1	0x00
133 #define	UMOSCOM_LCR_STOP_BITS_2	0x04	/* 2 if 6-8 bits/char or 1.5 if 5 */
134 #define	UMOSCOM_LCR_PARITY_NONE	0x00
135 #define	UMOSCOM_LCR_PARITY_ODD	0x08
136 #define	UMOSCOM_LCR_PARITY_EVEN	0x18
137 #define	UMOSCOM_LCR_BREAK	0x40
138 #define	UMOSCOM_LCR_DIVLATCH_EN	0x80
139 
140 #define	UMOSCOM_MCR_DTR		0x01
141 #define	UMOSCOM_MCR_RTS		0x02
142 #define	UMOSCOM_MCR_LOOP	0x04
143 #define	UMOSCOM_MCR_INTEN	0x08
144 #define	UMOSCOM_MCR_LOOPBACK	0x10
145 #define	UMOSCOM_MCR_XONANY	0x20
146 #define	UMOSCOM_MCR_IRDA_EN	0x40
147 #define	UMOSCOM_MCR_BAUD_DIV4	0x80
148 
149 #define	UMOSCOM_LSR_RXDATA	0x01
150 #define	UMOSCOM_LSR_RXOVER	0x02
151 #define	UMOSCOM_LSR_RXPAR_ERR	0x04
152 #define	UMOSCOM_LSR_RXFRM_ERR	0x08
153 #define	UMOSCOM_LSR_RXBREAK	0x10
154 #define	UMOSCOM_LSR_TXEMPTY	0x20
155 #define	UMOSCOM_LSR_TXALLEMPTY	0x40
156 #define	UMOSCOM_LSR_TXFIFO_ERR	0x80
157 
158 #define	UMOSCOM_MSR_CTS_CHG	0x01
159 #define	UMOSCOM_MSR_DSR_CHG	0x02
160 #define	UMOSCOM_MSR_RI_CHG	0x04
161 #define	UMOSCOM_MSR_CD_CHG	0x08
162 #define	UMOSCOM_MSR_CTS		0x10
163 #define	UMOSCOM_MSR_RTS		0x20
164 #define	UMOSCOM_MSR_RI		0x40
165 #define	UMOSCOM_MSR_CD		0x80
166 
167 #define	UMOSCOM_BAUD_REF	115200
168 
169 enum {
170 	UMOSCOM_BULK_DT_WR,
171 	UMOSCOM_BULK_DT_RD,
172 	UMOSCOM_INTR_DT_RD,
173 	UMOSCOM_N_TRANSFER,
174 };
175 
176 struct umoscom_softc {
177 	struct ucom_super_softc sc_super_ucom;
178 	struct ucom_softc sc_ucom;
179 
180 	struct usb_xfer *sc_xfer[UMOSCOM_N_TRANSFER];
181 	struct usb_device *sc_udev;
182 	struct mtx sc_mtx;
183 
184 	uint8_t	sc_mcr;
185 	uint8_t	sc_lcr;
186 };
187 
188 /* prototypes */
189 
190 static device_probe_t umoscom_probe;
191 static device_attach_t umoscom_attach;
192 static device_detach_t umoscom_detach;
193 static void umoscom_free_softc(struct umoscom_softc *);
194 
195 static usb_callback_t umoscom_write_callback;
196 static usb_callback_t umoscom_read_callback;
197 static usb_callback_t umoscom_intr_callback;
198 
199 static void	umoscom_free(struct ucom_softc *);
200 static void	umoscom_cfg_open(struct ucom_softc *);
201 static void	umoscom_cfg_close(struct ucom_softc *);
202 static void	umoscom_cfg_set_break(struct ucom_softc *, uint8_t);
203 static void	umoscom_cfg_set_dtr(struct ucom_softc *, uint8_t);
204 static void	umoscom_cfg_set_rts(struct ucom_softc *, uint8_t);
205 static int	umoscom_pre_param(struct ucom_softc *, struct termios *);
206 static void	umoscom_cfg_param(struct ucom_softc *, struct termios *);
207 static void	umoscom_cfg_get_status(struct ucom_softc *, uint8_t *,
208 		    uint8_t *);
209 static void	umoscom_cfg_write(struct umoscom_softc *, uint16_t, uint16_t);
210 static uint8_t	umoscom_cfg_read(struct umoscom_softc *, uint16_t);
211 static void	umoscom_start_read(struct ucom_softc *);
212 static void	umoscom_stop_read(struct ucom_softc *);
213 static void	umoscom_start_write(struct ucom_softc *);
214 static void	umoscom_stop_write(struct ucom_softc *);
215 static void	umoscom_poll(struct ucom_softc *ucom);
216 
217 static const struct usb_config umoscom_config_data[UMOSCOM_N_TRANSFER] = {
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 driver_t umoscom_driver = {
274 	.name = "umoscom",
275 	.methods = umoscom_methods,
276 	.size = sizeof(struct umoscom_softc),
277 };
278 
279 static const STRUCT_USB_HOST_ID umoscom_devs[] = {
280 	{USB_VPI(USB_VENDOR_MOSCHIP, USB_PRODUCT_MOSCHIP_MCS7703, 0)}
281 };
282 
283 DRIVER_MODULE(umoscom, uhub, umoscom_driver, NULL, NULL);
284 MODULE_DEPEND(umoscom, ucom, 1, 1, 1);
285 MODULE_DEPEND(umoscom, usb, 1, 1, 1);
286 MODULE_VERSION(umoscom, 1);
287 USB_PNP_HOST_INFO(umoscom_devs);
288 
289 static int
290 umoscom_probe(device_t dev)
291 {
292 	struct usb_attach_arg *uaa = device_get_ivars(dev);
293 
294 	if (uaa->usb_mode != USB_MODE_HOST) {
295 		return (ENXIO);
296 	}
297 	if (uaa->info.bConfigIndex != UMOSCOM_CONFIG_INDEX) {
298 		return (ENXIO);
299 	}
300 	if (uaa->info.bIfaceIndex != UMOSCOM_IFACE_INDEX) {
301 		return (ENXIO);
302 	}
303 	return (usbd_lookup_id_by_uaa(umoscom_devs, sizeof(umoscom_devs), uaa));
304 }
305 
306 static int
307 umoscom_attach(device_t dev)
308 {
309 	struct usb_attach_arg *uaa = device_get_ivars(dev);
310 	struct umoscom_softc *sc = device_get_softc(dev);
311 	int error;
312 	uint8_t iface_index;
313 
314 	sc->sc_udev = uaa->device;
315 	sc->sc_mcr = 0x08;		/* enable interrupts */
316 
317 	/* XXX the device doesn't provide any ID string, so set a static one */
318 	device_set_desc(dev, "MOSCHIP USB Serial Port Adapter");
319 	device_printf(dev, "<MOSCHIP USB Serial Port Adapter>\n");
320 
321 	mtx_init(&sc->sc_mtx, "umoscom", NULL, MTX_DEF);
322 	ucom_ref(&sc->sc_super_ucom);
323 
324 	iface_index = UMOSCOM_IFACE_INDEX;
325 	error = usbd_transfer_setup(uaa->device, &iface_index,
326 	    sc->sc_xfer, umoscom_config_data,
327 	    UMOSCOM_N_TRANSFER, sc, &sc->sc_mtx);
328 
329 	if (error) {
330 		goto detach;
331 	}
332 	/* clear stall at first run */
333 	mtx_lock(&sc->sc_mtx);
334 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
335 	usbd_xfer_set_stall(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
336 	mtx_unlock(&sc->sc_mtx);
337 
338 	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
339 	    &umoscom_callback, &sc->sc_mtx);
340 	if (error) {
341 		goto detach;
342 	}
343 	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
344 
345 	return (0);
346 
347 detach:
348 	device_printf(dev, "attach error: %s\n", usbd_errstr(error));
349 	umoscom_detach(dev);
350 	return (ENXIO);
351 }
352 
353 static int
354 umoscom_detach(device_t dev)
355 {
356 	struct umoscom_softc *sc = device_get_softc(dev);
357 
358 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
359 	usbd_transfer_unsetup(sc->sc_xfer, UMOSCOM_N_TRANSFER);
360 
361 	device_claim_softc(dev);
362 
363 	umoscom_free_softc(sc);
364 
365 	return (0);
366 }
367 
368 UCOM_UNLOAD_DRAIN(umoscom);
369 
370 static void
371 umoscom_free_softc(struct umoscom_softc *sc)
372 {
373 	if (ucom_unref(&sc->sc_super_ucom)) {
374 		mtx_destroy(&sc->sc_mtx);
375 		device_free_softc(sc);
376 	}
377 }
378 
379 static void
380 umoscom_free(struct ucom_softc *ucom)
381 {
382 	umoscom_free_softc(ucom->sc_parent);
383 }
384 
385 static void
386 umoscom_cfg_open(struct ucom_softc *ucom)
387 {
388 	struct umoscom_softc *sc = ucom->sc_parent;
389 
390 	DPRINTF("\n");
391 
392 	/* Purge FIFOs or odd things happen */
393 	umoscom_cfg_write(sc, UMOSCOM_FIFO, 0x00 | UMOSCOM_UART_REG);
394 
395 	/* Enable FIFO */
396 	umoscom_cfg_write(sc, UMOSCOM_FIFO, UMOSCOM_FIFO_EN |
397 	    UMOSCOM_FIFO_RXCLR | UMOSCOM_FIFO_TXCLR |
398 	    UMOSCOM_FIFO_DMA_BLK | UMOSCOM_FIFO_RXLVL_MASK |
399 	    UMOSCOM_UART_REG);
400 
401 	/* Enable Interrupt Registers */
402 	umoscom_cfg_write(sc, UMOSCOM_INT, 0x0C | UMOSCOM_UART_REG);
403 
404 	/* Magic */
405 	umoscom_cfg_write(sc, 0x01, 0x08);
406 
407 	/* Magic */
408 	umoscom_cfg_write(sc, 0x00, 0x02);
409 }
410 
411 static void
412 umoscom_cfg_close(struct ucom_softc *ucom)
413 {
414 	return;
415 }
416 
417 static void
418 umoscom_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
419 {
420 	struct umoscom_softc *sc = ucom->sc_parent;
421 	uint16_t val;
422 
423 	val = sc->sc_lcr;
424 	if (onoff)
425 		val |= UMOSCOM_LCR_BREAK;
426 
427 	umoscom_cfg_write(sc, UMOSCOM_LCR, val | UMOSCOM_UART_REG);
428 }
429 
430 static void
431 umoscom_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
432 {
433 	struct umoscom_softc *sc = ucom->sc_parent;
434 
435 	if (onoff)
436 		sc->sc_mcr |= UMOSCOM_MCR_DTR;
437 	else
438 		sc->sc_mcr &= ~UMOSCOM_MCR_DTR;
439 
440 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
441 }
442 
443 static void
444 umoscom_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
445 {
446 	struct umoscom_softc *sc = ucom->sc_parent;
447 
448 	if (onoff)
449 		sc->sc_mcr |= UMOSCOM_MCR_RTS;
450 	else
451 		sc->sc_mcr &= ~UMOSCOM_MCR_RTS;
452 
453 	umoscom_cfg_write(sc, UMOSCOM_MCR, sc->sc_mcr | UMOSCOM_UART_REG);
454 }
455 
456 static int
457 umoscom_pre_param(struct ucom_softc *ucom, struct termios *t)
458 {
459 	if ((t->c_ospeed <= 1) || (t->c_ospeed > 115200))
460 		return (EINVAL);
461 
462 	return (0);
463 }
464 
465 static void
466 umoscom_cfg_param(struct ucom_softc *ucom, struct termios *t)
467 {
468 	struct umoscom_softc *sc = ucom->sc_parent;
469 	uint16_t data;
470 
471 	DPRINTF("speed=%d\n", t->c_ospeed);
472 
473 	data = ((uint32_t)UMOSCOM_BAUD_REF) / ((uint32_t)t->c_ospeed);
474 
475 	if (data == 0) {
476 		DPRINTF("invalid baud rate!\n");
477 		return;
478 	}
479 	umoscom_cfg_write(sc, UMOSCOM_LCR,
480 	    UMOSCOM_LCR_DIVLATCH_EN | UMOSCOM_UART_REG);
481 
482 	umoscom_cfg_write(sc, UMOSCOM_BAUDLO,
483 	    (data & 0xFF) | UMOSCOM_UART_REG);
484 
485 	umoscom_cfg_write(sc, UMOSCOM_BAUDHI,
486 	    ((data >> 8) & 0xFF) | UMOSCOM_UART_REG);
487 
488 	if (t->c_cflag & CSTOPB)
489 		data = UMOSCOM_LCR_STOP_BITS_2;
490 	else
491 		data = UMOSCOM_LCR_STOP_BITS_1;
492 
493 	if (t->c_cflag & PARENB) {
494 		if (t->c_cflag & PARODD)
495 			data |= UMOSCOM_LCR_PARITY_ODD;
496 		else
497 			data |= UMOSCOM_LCR_PARITY_EVEN;
498 	} else
499 		data |= UMOSCOM_LCR_PARITY_NONE;
500 
501 	switch (t->c_cflag & CSIZE) {
502 	case CS5:
503 		data |= UMOSCOM_LCR_DBITS(5);
504 		break;
505 	case CS6:
506 		data |= UMOSCOM_LCR_DBITS(6);
507 		break;
508 	case CS7:
509 		data |= UMOSCOM_LCR_DBITS(7);
510 		break;
511 	case CS8:
512 		data |= UMOSCOM_LCR_DBITS(8);
513 		break;
514 	}
515 
516 	sc->sc_lcr = data;
517 	umoscom_cfg_write(sc, UMOSCOM_LCR, data | UMOSCOM_UART_REG);
518 }
519 
520 static void
521 umoscom_cfg_get_status(struct ucom_softc *ucom, uint8_t *p_lsr, uint8_t *p_msr)
522 {
523 	struct umoscom_softc *sc = ucom->sc_parent;
524 	uint8_t msr;
525 
526 	DPRINTFN(5, "\n");
527 
528 	/*
529 	 * Read status registers.  MSR bits need translation from ns16550 to
530 	 * SER_* values.  LSR bits are ns16550 in hardware and ucom.
531 	 */
532 
533 	*p_lsr = umoscom_cfg_read(sc, UMOSCOM_LSR);
534 	msr = umoscom_cfg_read(sc, UMOSCOM_MSR);
535 
536 	/* translate bits */
537 
538 	if (msr & UMOSCOM_MSR_CTS)
539 		*p_msr |= SER_CTS;
540 
541 	if (msr & UMOSCOM_MSR_CD)
542 		*p_msr |= SER_DCD;
543 
544 	if (msr & UMOSCOM_MSR_RI)
545 		*p_msr |= SER_RI;
546 
547 	if (msr & UMOSCOM_MSR_RTS)
548 		*p_msr |= SER_DSR;
549 }
550 
551 static void
552 umoscom_cfg_write(struct umoscom_softc *sc, uint16_t reg, uint16_t val)
553 {
554 	struct usb_device_request req;
555 
556 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
557 	req.bRequest = UMOSCOM_WRITE;
558 	USETW(req.wValue, val);
559 	USETW(req.wIndex, reg);
560 	USETW(req.wLength, 0);
561 
562 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
563 	    &req, NULL, 0, 1000);
564 }
565 
566 static uint8_t
567 umoscom_cfg_read(struct umoscom_softc *sc, uint16_t reg)
568 {
569 	struct usb_device_request req;
570 	uint8_t val;
571 
572 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
573 	req.bRequest = UMOSCOM_READ;
574 	USETW(req.wValue, 0);
575 	USETW(req.wIndex, reg);
576 	USETW(req.wLength, 1);
577 
578 	ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
579 	    &req, &val, 0, 1000);
580 
581 	DPRINTF("reg=0x%04x, val=0x%02x\n", reg, val);
582 
583 	return (val);
584 }
585 
586 static void
587 umoscom_start_read(struct ucom_softc *ucom)
588 {
589 	struct umoscom_softc *sc = ucom->sc_parent;
590 
591 #if 0
592 	/* start interrupt endpoint */
593 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
594 #endif
595 	/* start read endpoint */
596 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
597 }
598 
599 static void
600 umoscom_stop_read(struct ucom_softc *ucom)
601 {
602 	struct umoscom_softc *sc = ucom->sc_parent;
603 
604 	/* stop interrupt transfer */
605 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_INTR_DT_RD]);
606 
607 	/* stop read endpoint */
608 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_RD]);
609 }
610 
611 static void
612 umoscom_start_write(struct ucom_softc *ucom)
613 {
614 	struct umoscom_softc *sc = ucom->sc_parent;
615 
616 	usbd_transfer_start(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
617 }
618 
619 static void
620 umoscom_stop_write(struct ucom_softc *ucom)
621 {
622 	struct umoscom_softc *sc = ucom->sc_parent;
623 
624 	usbd_transfer_stop(sc->sc_xfer[UMOSCOM_BULK_DT_WR]);
625 }
626 
627 static void
628 umoscom_write_callback(struct usb_xfer *xfer, usb_error_t error)
629 {
630 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
631 	struct usb_page_cache *pc;
632 	uint32_t actlen;
633 
634 	switch (USB_GET_STATE(xfer)) {
635 	case USB_ST_SETUP:
636 	case USB_ST_TRANSFERRED:
637 tr_setup:
638 		DPRINTF("\n");
639 
640 		pc = usbd_xfer_get_frame(xfer, 0);
641 		if (ucom_get_data(&sc->sc_ucom, pc, 0,
642 		    UMOSCOM_BUFSIZE, &actlen)) {
643 			usbd_xfer_set_frame_len(xfer, 0, actlen);
644 			usbd_transfer_submit(xfer);
645 		}
646 		return;
647 
648 	default:			/* Error */
649 		if (error != USB_ERR_CANCELLED) {
650 			DPRINTFN(0, "transfer failed\n");
651 			/* try to clear stall first */
652 			usbd_xfer_set_stall(xfer);
653 			goto tr_setup;
654 		}
655 		return;
656 	}
657 }
658 
659 static void
660 umoscom_read_callback(struct usb_xfer *xfer, usb_error_t error)
661 {
662 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
663 	struct usb_page_cache *pc;
664 	int actlen;
665 
666 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
667 
668 	switch (USB_GET_STATE(xfer)) {
669 	case USB_ST_TRANSFERRED:
670 		DPRINTF("got %d bytes\n", actlen);
671 		pc = usbd_xfer_get_frame(xfer, 0);
672 		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
673 
674 	case USB_ST_SETUP:
675 tr_setup:
676 		DPRINTF("\n");
677 
678 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
679 		usbd_transfer_submit(xfer);
680 		return;
681 
682 	default:			/* Error */
683 		if (error != USB_ERR_CANCELLED) {
684 			DPRINTFN(0, "transfer failed\n");
685 			/* try to clear stall first */
686 			usbd_xfer_set_stall(xfer);
687 			goto tr_setup;
688 		}
689 		return;
690 	}
691 }
692 
693 static void
694 umoscom_intr_callback(struct usb_xfer *xfer, usb_error_t error)
695 {
696 	struct umoscom_softc *sc = usbd_xfer_softc(xfer);
697 	int actlen;
698 
699 	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
700 
701 	switch (USB_GET_STATE(xfer)) {
702 	case USB_ST_TRANSFERRED:
703 		if (actlen < 2) {
704 			DPRINTF("too short message\n");
705 			goto tr_setup;
706 		}
707 		ucom_status_change(&sc->sc_ucom);
708 
709 	case USB_ST_SETUP:
710 tr_setup:
711 		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
712 		usbd_transfer_submit(xfer);
713 		return;
714 
715 	default:			/* Error */
716 		if (error != USB_ERR_CANCELLED) {
717 			DPRINTFN(0, "transfer failed\n");
718 			/* try to clear stall first */
719 			usbd_xfer_set_stall(xfer);
720 			goto tr_setup;
721 		}
722 		return;
723 	}
724 }
725 
726 static void
727 umoscom_poll(struct ucom_softc *ucom)
728 {
729 	struct umoscom_softc *sc = ucom->sc_parent;
730 	usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
731 }
732