uslcom.c revision 214761 
1/*	$OpenBSD: uslcom.c,v 1.17 2007/11/24 10:52:12 jsg Exp $	*/
2
3#include <sys/cdefs.h>
4__FBSDID("$FreeBSD: head/sys/dev/usb/serial/uslcom.c 214761 2010-11-03 21:50:49Z n_hibma $");
5
6/*
7 * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
8 *
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 */
21
22#include <sys/stdint.h>
23#include <sys/stddef.h>
24#include <sys/param.h>
25#include <sys/queue.h>
26#include <sys/types.h>
27#include <sys/systm.h>
28#include <sys/kernel.h>
29#include <sys/bus.h>
30#include <sys/linker_set.h>
31#include <sys/module.h>
32#include <sys/lock.h>
33#include <sys/mutex.h>
34#include <sys/condvar.h>
35#include <sys/sysctl.h>
36#include <sys/sx.h>
37#include <sys/unistd.h>
38#include <sys/callout.h>
39#include <sys/malloc.h>
40#include <sys/priv.h>
41
42#include <dev/usb/usb.h>
43#include <dev/usb/usbdi.h>
44#include <dev/usb/usbdi_util.h>
45#include "usbdevs.h"
46
47#define	USB_DEBUG_VAR uslcom_debug
48#include <dev/usb/usb_debug.h>
49#include <dev/usb/usb_process.h>
50
51#include <dev/usb/serial/usb_serial.h>
52
53#ifdef USB_DEBUG
54static int uslcom_debug = 0;
55
56SYSCTL_NODE(_hw_usb, OID_AUTO, uslcom, CTLFLAG_RW, 0, "USB uslcom");
57SYSCTL_INT(_hw_usb_uslcom, OID_AUTO, debug, CTLFLAG_RW,
58    &uslcom_debug, 0, "Debug level");
59#endif
60
61#define	USLCOM_BULK_BUF_SIZE		1024
62#define	USLCOM_CONFIG_INDEX	0
63#define	USLCOM_IFACE_INDEX	0
64
65#define	USLCOM_SET_DATA_BITS(x)	((x) << 8)
66
67#define	USLCOM_WRITE		0x41
68#define	USLCOM_READ		0xc1
69
70#define	USLCOM_UART		0x00
71#define	USLCOM_BAUD_RATE	0x01
72#define	USLCOM_DATA		0x03
73#define	USLCOM_BREAK		0x05
74#define	USLCOM_CTRL		0x07
75
76#define	USLCOM_UART_DISABLE	0x00
77#define	USLCOM_UART_ENABLE	0x01
78
79#define	USLCOM_CTRL_DTR_ON	0x0001
80#define	USLCOM_CTRL_DTR_SET	0x0100
81#define	USLCOM_CTRL_RTS_ON	0x0002
82#define	USLCOM_CTRL_RTS_SET	0x0200
83#define	USLCOM_CTRL_CTS		0x0010
84#define	USLCOM_CTRL_DSR		0x0020
85#define	USLCOM_CTRL_DCD		0x0080
86
87#define	USLCOM_BAUD_REF		0x384000
88
89#define	USLCOM_STOP_BITS_1	0x00
90#define	USLCOM_STOP_BITS_2	0x02
91
92#define	USLCOM_PARITY_NONE	0x00
93#define	USLCOM_PARITY_ODD	0x10
94#define	USLCOM_PARITY_EVEN	0x20
95
96#define	USLCOM_PORT_NO		0xFFFF /* XXX think this should be 0 --hps */
97
98#define	USLCOM_BREAK_OFF	0x00
99#define	USLCOM_BREAK_ON		0x01
100
101enum {
102	USLCOM_BULK_DT_WR,
103	USLCOM_BULK_DT_RD,
104	USLCOM_N_TRANSFER,
105};
106
107struct uslcom_softc {
108	struct ucom_super_softc sc_super_ucom;
109	struct ucom_softc sc_ucom;
110
111	struct usb_xfer *sc_xfer[USLCOM_N_TRANSFER];
112	struct usb_device *sc_udev;
113	struct mtx sc_mtx;
114
115	uint8_t		 sc_msr;
116	uint8_t		 sc_lsr;
117};
118
119static device_probe_t uslcom_probe;
120static device_attach_t uslcom_attach;
121static device_detach_t uslcom_detach;
122
123static usb_callback_t uslcom_write_callback;
124static usb_callback_t uslcom_read_callback;
125
126static void uslcom_open(struct ucom_softc *);
127static void uslcom_close(struct ucom_softc *);
128static void uslcom_set_dtr(struct ucom_softc *, uint8_t);
129static void uslcom_set_rts(struct ucom_softc *, uint8_t);
130static void uslcom_set_break(struct ucom_softc *, uint8_t);
131static int uslcom_pre_param(struct ucom_softc *, struct termios *);
132static void uslcom_param(struct ucom_softc *, struct termios *);
133static void uslcom_get_status(struct ucom_softc *, uint8_t *, uint8_t *);
134static void uslcom_start_read(struct ucom_softc *);
135static void uslcom_stop_read(struct ucom_softc *);
136static void uslcom_start_write(struct ucom_softc *);
137static void uslcom_stop_write(struct ucom_softc *);
138static void uslcom_poll(struct ucom_softc *ucom);
139
140static const struct usb_config uslcom_config[USLCOM_N_TRANSFER] = {
141
142	[USLCOM_BULK_DT_WR] = {
143		.type = UE_BULK,
144		.endpoint = UE_ADDR_ANY,
145		.direction = UE_DIR_OUT,
146		.bufsize = USLCOM_BULK_BUF_SIZE,
147		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
148		.callback = &uslcom_write_callback,
149	},
150
151	[USLCOM_BULK_DT_RD] = {
152		.type = UE_BULK,
153		.endpoint = UE_ADDR_ANY,
154		.direction = UE_DIR_IN,
155		.bufsize = USLCOM_BULK_BUF_SIZE,
156		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
157		.callback = &uslcom_read_callback,
158	},
159};
160
161static struct ucom_callback uslcom_callback = {
162	.ucom_cfg_open = &uslcom_open,
163	.ucom_cfg_close = &uslcom_close,
164	.ucom_cfg_get_status = &uslcom_get_status,
165	.ucom_cfg_set_dtr = &uslcom_set_dtr,
166	.ucom_cfg_set_rts = &uslcom_set_rts,
167	.ucom_cfg_set_break = &uslcom_set_break,
168	.ucom_cfg_param = &uslcom_param,
169	.ucom_pre_param = &uslcom_pre_param,
170	.ucom_start_read = &uslcom_start_read,
171	.ucom_stop_read = &uslcom_stop_read,
172	.ucom_start_write = &uslcom_start_write,
173	.ucom_stop_write = &uslcom_stop_write,
174	.ucom_poll = &uslcom_poll,
175};
176
177static const struct usb_device_id uslcom_devs[] = {
178#define	USLCOM_DEV(v,p)  { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
179    USLCOM_DEV(BALTECH, CARDREADER),
180    USLCOM_DEV(CLIPSAL, 5500PCU),
181    USLCOM_DEV(DATAAPEX, MULTICOM),
182    USLCOM_DEV(DELL, DW700),
183    USLCOM_DEV(DIGIANSWER, ZIGBEE802154),
184    USLCOM_DEV(DYNASTREAM, ANTDEVBOARD),
185    USLCOM_DEV(DYNASTREAM, ANTDEVBOARD2),
186    USLCOM_DEV(DYNASTREAM, ANT2USB),
187    USLCOM_DEV(ELV, USBI2C),
188    USLCOM_DEV(FOXCONN, PIRELLI_DP_L10),
189    USLCOM_DEV(GEMALTO, PROXPU),
190    USLCOM_DEV(JABLOTRON, PC60B),
191    USLCOM_DEV(MEI, CASHFLOW_SC),
192    USLCOM_DEV(MEI, S2000),
193    USLCOM_DEV(JABLOTRON, PC60B),
194    USLCOM_DEV(OWEN, AC4),
195    USLCOM_DEV(PHILIPS, ACE1001),
196    USLCOM_DEV(PLX, CA42),
197    USLCOM_DEV(SILABS, AEROCOMM),
198    USLCOM_DEV(SILABS, AMBER_AMB2560),
199    USLCOM_DEV(SILABS, ARGUSISP),
200    USLCOM_DEV(SILABS, ARKHAM_DS101_A),
201    USLCOM_DEV(SILABS, ARKHAM_DS101_M),
202    USLCOM_DEV(SILABS, ARYGON_MIFARE),
203    USLCOM_DEV(SILABS, AVIT_USB_TTL),
204    USLCOM_DEV(SILABS, BEI_VCP),
205    USLCOM_DEV(SILABS, BSM7DUSB),
206    USLCOM_DEV(SILABS, BURNSIDE),
207    USLCOM_DEV(SILABS, C2_EDGE_MODEM),
208    USLCOM_DEV(SILABS, CP2102),
209    USLCOM_DEV(SILABS, CP210X_2),
210    USLCOM_DEV(SILABS, CRUMB128),
211    USLCOM_DEV(SILABS, CYGNAL),
212    USLCOM_DEV(SILABS, CYGNAL_DEBUG),
213    USLCOM_DEV(SILABS, CYGNAL_GPS),
214    USLCOM_DEV(SILABS, DEGREE),
215    USLCOM_DEV(SILABS, EMS_C1007),
216    USLCOM_DEV(SILABS, HELICOM),
217    USLCOM_DEV(SILABS, IMS_USB_RS422),
218    USLCOM_DEV(SILABS, INFINITY_MIC),
219    USLCOM_DEV(SILABS, INSYS_MODEM),
220    USLCOM_DEV(SILABS, KYOCERA_GPS),
221    USLCOM_DEV(SILABS, LIPOWSKY_HARP),
222    USLCOM_DEV(SILABS, LIPOWSKY_JTAG),
223    USLCOM_DEV(SILABS, LIPOWSKY_LIN),
224    USLCOM_DEV(SILABS, MC35PU),
225    USLCOM_DEV(SILABS, MJS_TOSLINK),
226    USLCOM_DEV(SILABS, MSD_DASHHAWK),
227    USLCOM_DEV(SILABS, POLOLU),
228    USLCOM_DEV(SILABS, PROCYON_AVS),
229    USLCOM_DEV(SILABS, SB_PARAMOUNT_ME),
230    USLCOM_DEV(SILABS, SUUNTO),
231    USLCOM_DEV(SILABS, TAMSMASTER),
232    USLCOM_DEV(SILABS, TELEGESYS_ETRX2),
233    USLCOM_DEV(SILABS, TRACIENT),
234    USLCOM_DEV(SILABS, TRAQMATE),
235    USLCOM_DEV(SILABS, USBCOUNT50),
236    USLCOM_DEV(SILABS, USBPULSE100),
237    USLCOM_DEV(SILABS, USBSCOPE50),
238    USLCOM_DEV(SILABS, USBWAVE12),
239    USLCOM_DEV(SILABS, VSTABI),
240    USLCOM_DEV(SILABS, WAVIT),
241    USLCOM_DEV(SILABS, WMRBATT),
242    USLCOM_DEV(SILABS, WMRRIGBLASTER),
243    USLCOM_DEV(SILABS, WMRRIGTALK),
244    USLCOM_DEV(SILABS, ZEPHYR_BIO),
245    USLCOM_DEV(SILABS2, DCU11CLONE),
246    USLCOM_DEV(SILABS3, GPRS_MODEM),
247    USLCOM_DEV(SILABS4, 100EU_MODEM),
248    USLCOM_DEV(SYNTECH, CYPHERLAB100),
249    USLCOM_DEV(USI, MC60),
250    USLCOM_DEV(VAISALA, CABLE),
251    USLCOM_DEV(WAVESENSE, JAZZ),
252#undef USLCOM_DEV
253};
254
255static device_method_t uslcom_methods[] = {
256	DEVMETHOD(device_probe, uslcom_probe),
257	DEVMETHOD(device_attach, uslcom_attach),
258	DEVMETHOD(device_detach, uslcom_detach),
259	{0, 0}
260};
261
262static devclass_t uslcom_devclass;
263
264static driver_t uslcom_driver = {
265	.name = "uslcom",
266	.methods = uslcom_methods,
267	.size = sizeof(struct uslcom_softc),
268};
269
270DRIVER_MODULE(uslcom, uhub, uslcom_driver, uslcom_devclass, NULL, 0);
271MODULE_DEPEND(uslcom, ucom, 1, 1, 1);
272MODULE_DEPEND(uslcom, usb, 1, 1, 1);
273MODULE_VERSION(uslcom, 1);
274
275static int
276uslcom_probe(device_t dev)
277{
278	struct usb_attach_arg *uaa = device_get_ivars(dev);
279
280	DPRINTFN(11, "\n");
281
282	if (uaa->usb_mode != USB_MODE_HOST) {
283		return (ENXIO);
284	}
285	if (uaa->info.bConfigIndex != USLCOM_CONFIG_INDEX) {
286		return (ENXIO);
287	}
288	if (uaa->info.bIfaceIndex != USLCOM_IFACE_INDEX) {
289		return (ENXIO);
290	}
291	return (usbd_lookup_id_by_uaa(uslcom_devs, sizeof(uslcom_devs), uaa));
292}
293
294static int
295uslcom_attach(device_t dev)
296{
297	struct usb_attach_arg *uaa = device_get_ivars(dev);
298	struct uslcom_softc *sc = device_get_softc(dev);
299	int error;
300
301	DPRINTFN(11, "\n");
302
303	device_set_usb_desc(dev);
304	mtx_init(&sc->sc_mtx, "uslcom", NULL, MTX_DEF);
305
306	sc->sc_udev = uaa->device;
307
308	error = usbd_transfer_setup(uaa->device,
309	    &uaa->info.bIfaceIndex, sc->sc_xfer, uslcom_config,
310	    USLCOM_N_TRANSFER, sc, &sc->sc_mtx);
311	if (error) {
312		DPRINTF("one or more missing USB endpoints, "
313		    "error=%s\n", usbd_errstr(error));
314		goto detach;
315	}
316	/* clear stall at first run */
317	mtx_lock(&sc->sc_mtx);
318	usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_WR]);
319	usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_RD]);
320	mtx_unlock(&sc->sc_mtx);
321
322	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
323	    &uslcom_callback, &sc->sc_mtx);
324	if (error) {
325		goto detach;
326	}
327	return (0);
328
329detach:
330	uslcom_detach(dev);
331	return (ENXIO);
332}
333
334static int
335uslcom_detach(device_t dev)
336{
337	struct uslcom_softc *sc = device_get_softc(dev);
338
339	DPRINTF("sc=%p\n", sc);
340
341	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
342	usbd_transfer_unsetup(sc->sc_xfer, USLCOM_N_TRANSFER);
343	mtx_destroy(&sc->sc_mtx);
344
345	return (0);
346}
347
348static void
349uslcom_open(struct ucom_softc *ucom)
350{
351	struct uslcom_softc *sc = ucom->sc_parent;
352	struct usb_device_request req;
353
354	req.bmRequestType = USLCOM_WRITE;
355	req.bRequest = USLCOM_UART;
356	USETW(req.wValue, USLCOM_UART_ENABLE);
357	USETW(req.wIndex, USLCOM_PORT_NO);
358	USETW(req.wLength, 0);
359
360        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
361	    &req, NULL, 0, 1000)) {
362		DPRINTF("UART enable failed (ignored)\n");
363	}
364}
365
366static void
367uslcom_close(struct ucom_softc *ucom)
368{
369	struct uslcom_softc *sc = ucom->sc_parent;
370	struct usb_device_request req;
371
372	req.bmRequestType = USLCOM_WRITE;
373	req.bRequest = USLCOM_UART;
374	USETW(req.wValue, USLCOM_UART_DISABLE);
375	USETW(req.wIndex, USLCOM_PORT_NO);
376	USETW(req.wLength, 0);
377
378        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
379	    &req, NULL, 0, 1000)) {
380		DPRINTF("UART disable failed (ignored)\n");
381	}
382}
383
384static void
385uslcom_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
386{
387        struct uslcom_softc *sc = ucom->sc_parent;
388	struct usb_device_request req;
389	uint16_t ctl;
390
391        DPRINTF("onoff = %d\n", onoff);
392
393	ctl = onoff ? USLCOM_CTRL_DTR_ON : 0;
394	ctl |= USLCOM_CTRL_DTR_SET;
395
396	req.bmRequestType = USLCOM_WRITE;
397	req.bRequest = USLCOM_CTRL;
398	USETW(req.wValue, ctl);
399	USETW(req.wIndex, USLCOM_PORT_NO);
400	USETW(req.wLength, 0);
401
402        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
403	    &req, NULL, 0, 1000)) {
404		DPRINTF("Setting DTR failed (ignored)\n");
405	}
406}
407
408static void
409uslcom_set_rts(struct ucom_softc *ucom, uint8_t onoff)
410{
411        struct uslcom_softc *sc = ucom->sc_parent;
412	struct usb_device_request req;
413	uint16_t ctl;
414
415        DPRINTF("onoff = %d\n", onoff);
416
417	ctl = onoff ? USLCOM_CTRL_RTS_ON : 0;
418	ctl |= USLCOM_CTRL_RTS_SET;
419
420	req.bmRequestType = USLCOM_WRITE;
421	req.bRequest = USLCOM_CTRL;
422	USETW(req.wValue, ctl);
423	USETW(req.wIndex, USLCOM_PORT_NO);
424	USETW(req.wLength, 0);
425
426        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
427	    &req, NULL, 0, 1000)) {
428		DPRINTF("Setting DTR failed (ignored)\n");
429	}
430}
431
432static int
433uslcom_pre_param(struct ucom_softc *ucom, struct termios *t)
434{
435	if (t->c_ospeed <= 0 || t->c_ospeed > 921600)
436		return (EINVAL);
437	return (0);
438}
439
440static void
441uslcom_param(struct ucom_softc *ucom, struct termios *t)
442{
443	struct uslcom_softc *sc = ucom->sc_parent;
444	struct usb_device_request req;
445	uint16_t data;
446
447	DPRINTF("\n");
448
449	req.bmRequestType = USLCOM_WRITE;
450	req.bRequest = USLCOM_BAUD_RATE;
451	USETW(req.wValue, USLCOM_BAUD_REF / t->c_ospeed);
452	USETW(req.wIndex, USLCOM_PORT_NO);
453	USETW(req.wLength, 0);
454
455        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
456	    &req, NULL, 0, 1000)) {
457		DPRINTF("Set baudrate failed (ignored)\n");
458	}
459
460	if (t->c_cflag & CSTOPB)
461		data = USLCOM_STOP_BITS_2;
462	else
463		data = USLCOM_STOP_BITS_1;
464	if (t->c_cflag & PARENB) {
465		if (t->c_cflag & PARODD)
466			data |= USLCOM_PARITY_ODD;
467		else
468			data |= USLCOM_PARITY_EVEN;
469	} else
470		data |= USLCOM_PARITY_NONE;
471	switch (t->c_cflag & CSIZE) {
472	case CS5:
473		data |= USLCOM_SET_DATA_BITS(5);
474		break;
475	case CS6:
476		data |= USLCOM_SET_DATA_BITS(6);
477		break;
478	case CS7:
479		data |= USLCOM_SET_DATA_BITS(7);
480		break;
481	case CS8:
482		data |= USLCOM_SET_DATA_BITS(8);
483		break;
484	}
485
486	req.bmRequestType = USLCOM_WRITE;
487	req.bRequest = USLCOM_DATA;
488	USETW(req.wValue, data);
489	USETW(req.wIndex, USLCOM_PORT_NO);
490	USETW(req.wLength, 0);
491
492        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
493	    &req, NULL, 0, 1000)) {
494		DPRINTF("Set format failed (ignored)\n");
495	}
496	return;
497}
498
499static void
500uslcom_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
501{
502	struct uslcom_softc *sc = ucom->sc_parent;
503
504	DPRINTF("\n");
505
506	*lsr = sc->sc_lsr;
507	*msr = sc->sc_msr;
508}
509
510static void
511uslcom_set_break(struct ucom_softc *ucom, uint8_t onoff)
512{
513        struct uslcom_softc *sc = ucom->sc_parent;
514	struct usb_device_request req;
515	uint16_t brk = onoff ? USLCOM_BREAK_ON : USLCOM_BREAK_OFF;
516
517	req.bmRequestType = USLCOM_WRITE;
518	req.bRequest = USLCOM_BREAK;
519	USETW(req.wValue, brk);
520	USETW(req.wIndex, USLCOM_PORT_NO);
521	USETW(req.wLength, 0);
522
523        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
524	    &req, NULL, 0, 1000)) {
525		DPRINTF("Set BREAK failed (ignored)\n");
526	}
527}
528
529static void
530uslcom_write_callback(struct usb_xfer *xfer, usb_error_t error)
531{
532	struct uslcom_softc *sc = usbd_xfer_softc(xfer);
533	struct usb_page_cache *pc;
534	uint32_t actlen;
535
536	switch (USB_GET_STATE(xfer)) {
537	case USB_ST_SETUP:
538	case USB_ST_TRANSFERRED:
539tr_setup:
540		pc = usbd_xfer_get_frame(xfer, 0);
541		if (ucom_get_data(&sc->sc_ucom, pc, 0,
542		    USLCOM_BULK_BUF_SIZE, &actlen)) {
543
544			DPRINTF("actlen = %d\n", actlen);
545
546			usbd_xfer_set_frame_len(xfer, 0, actlen);
547			usbd_transfer_submit(xfer);
548		}
549		return;
550
551	default:			/* Error */
552		if (error != USB_ERR_CANCELLED) {
553			/* try to clear stall first */
554			usbd_xfer_set_stall(xfer);
555			goto tr_setup;
556		}
557		return;
558	}
559}
560
561static void
562uslcom_read_callback(struct usb_xfer *xfer, usb_error_t error)
563{
564	struct uslcom_softc *sc = usbd_xfer_softc(xfer);
565	struct usb_page_cache *pc;
566	int actlen;
567
568	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
569
570	switch (USB_GET_STATE(xfer)) {
571	case USB_ST_TRANSFERRED:
572		pc = usbd_xfer_get_frame(xfer, 0);
573		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
574
575	case USB_ST_SETUP:
576tr_setup:
577		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
578		usbd_transfer_submit(xfer);
579		return;
580
581	default:			/* Error */
582		if (error != USB_ERR_CANCELLED) {
583			/* try to clear stall first */
584			usbd_xfer_set_stall(xfer);
585			goto tr_setup;
586		}
587		return;
588	}
589}
590
591static void
592uslcom_start_read(struct ucom_softc *ucom)
593{
594	struct uslcom_softc *sc = ucom->sc_parent;
595
596	/* start read endpoint */
597	usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_RD]);
598}
599
600static void
601uslcom_stop_read(struct ucom_softc *ucom)
602{
603	struct uslcom_softc *sc = ucom->sc_parent;
604
605	/* stop read endpoint */
606	usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_RD]);
607}
608
609static void
610uslcom_start_write(struct ucom_softc *ucom)
611{
612	struct uslcom_softc *sc = ucom->sc_parent;
613
614	usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_WR]);
615}
616
617static void
618uslcom_stop_write(struct ucom_softc *ucom)
619{
620	struct uslcom_softc *sc = ucom->sc_parent;
621
622	usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_WR]);
623}
624
625static void
626uslcom_poll(struct ucom_softc *ucom)
627{
628	struct uslcom_softc *sc = ucom->sc_parent;
629	usbd_transfer_poll(sc->sc_xfer, USLCOM_N_TRANSFER);
630}
631