uslcom.c revision 217200 
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 217200 2011-01-09 17:10:06Z gavin $");
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(FOXCONN, TCOM_TC_300),
190    USLCOM_DEV(GEMALTO, PROXPU),
191    USLCOM_DEV(JABLOTRON, PC60B),
192    USLCOM_DEV(MEI, CASHFLOW_SC),
193    USLCOM_DEV(MEI, S2000),
194    USLCOM_DEV(JABLOTRON, PC60B),
195    USLCOM_DEV(OWEN, AC4),
196    USLCOM_DEV(PHILIPS, ACE1001),
197    USLCOM_DEV(PLX, CA42),
198    USLCOM_DEV(RENESAS, RX610),
199    USLCOM_DEV(SILABS, AEROCOMM),
200    USLCOM_DEV(SILABS, AMBER_AMB2560),
201    USLCOM_DEV(SILABS, ARGUSISP),
202    USLCOM_DEV(SILABS, ARKHAM_DS101_A),
203    USLCOM_DEV(SILABS, ARKHAM_DS101_M),
204    USLCOM_DEV(SILABS, ARYGON_MIFARE),
205    USLCOM_DEV(SILABS, AVIT_USB_TTL),
206    USLCOM_DEV(SILABS, B_G_H3000),
207    USLCOM_DEV(SILABS, BALLUFF_RFID),
208    USLCOM_DEV(SILABS, BEI_VCP),
209    USLCOM_DEV(SILABS, BSM7DUSB),
210    USLCOM_DEV(SILABS, BURNSIDE),
211    USLCOM_DEV(SILABS, C2_EDGE_MODEM),
212    USLCOM_DEV(SILABS, CP2102),
213    USLCOM_DEV(SILABS, CP210X_2),
214    USLCOM_DEV(SILABS, CRUMB128),
215    USLCOM_DEV(SILABS, CYGNAL),
216    USLCOM_DEV(SILABS, CYGNAL_DEBUG),
217    USLCOM_DEV(SILABS, CYGNAL_GPS),
218    USLCOM_DEV(SILABS, DEGREE),
219    USLCOM_DEV(SILABS, EMS_C1007),
220    USLCOM_DEV(SILABS, HELICOM),
221    USLCOM_DEV(SILABS, IMS_USB_RS422),
222    USLCOM_DEV(SILABS, INFINITY_MIC),
223    USLCOM_DEV(SILABS, INSYS_MODEM),
224    USLCOM_DEV(SILABS, KYOCERA_GPS),
225    USLCOM_DEV(SILABS, LIPOWSKY_HARP),
226    USLCOM_DEV(SILABS, LIPOWSKY_JTAG),
227    USLCOM_DEV(SILABS, LIPOWSKY_LIN),
228    USLCOM_DEV(SILABS, MC35PU),
229    USLCOM_DEV(SILABS, MJS_TOSLINK),
230    USLCOM_DEV(SILABS, MSD_DASHHAWK),
231    USLCOM_DEV(SILABS, POLOLU),
232    USLCOM_DEV(SILABS, PROCYON_AVS),
233    USLCOM_DEV(SILABS, SB_PARAMOUNT_ME),
234    USLCOM_DEV(SILABS, SUUNTO),
235    USLCOM_DEV(SILABS, TAMSMASTER),
236    USLCOM_DEV(SILABS, TELEGESYS_ETRX2),
237    USLCOM_DEV(SILABS, TRACIENT),
238    USLCOM_DEV(SILABS, TRAQMATE),
239    USLCOM_DEV(SILABS, USBCOUNT50),
240    USLCOM_DEV(SILABS, USBPULSE100),
241    USLCOM_DEV(SILABS, USBSCOPE50),
242    USLCOM_DEV(SILABS, USBWAVE12),
243    USLCOM_DEV(SILABS, VSTABI),
244    USLCOM_DEV(SILABS, WAVIT),
245    USLCOM_DEV(SILABS, WMRBATT),
246    USLCOM_DEV(SILABS, WMRRIGBLASTER),
247    USLCOM_DEV(SILABS, WMRRIGTALK),
248    USLCOM_DEV(SILABS, ZEPHYR_BIO),
249    USLCOM_DEV(SILABS2, DCU11CLONE),
250    USLCOM_DEV(SILABS3, GPRS_MODEM),
251    USLCOM_DEV(SILABS4, 100EU_MODEM),
252    USLCOM_DEV(SYNTECH, CYPHERLAB100),
253    USLCOM_DEV(USI, MC60),
254    USLCOM_DEV(VAISALA, CABLE),
255    USLCOM_DEV(WAGO, SERVICECABLE),
256    USLCOM_DEV(WAVESENSE, JAZZ),
257    USLCOM_DEV(WIENERPLEINBAUS, PL512),
258    USLCOM_DEV(WIENERPLEINBAUS, RCM),
259    USLCOM_DEV(WIENERPLEINBAUS, MPOD),
260    USLCOM_DEV(WIENERPLEINBAUS, CML),
261#undef USLCOM_DEV
262};
263
264static device_method_t uslcom_methods[] = {
265	DEVMETHOD(device_probe, uslcom_probe),
266	DEVMETHOD(device_attach, uslcom_attach),
267	DEVMETHOD(device_detach, uslcom_detach),
268	{0, 0}
269};
270
271static devclass_t uslcom_devclass;
272
273static driver_t uslcom_driver = {
274	.name = "uslcom",
275	.methods = uslcom_methods,
276	.size = sizeof(struct uslcom_softc),
277};
278
279DRIVER_MODULE(uslcom, uhub, uslcom_driver, uslcom_devclass, NULL, 0);
280MODULE_DEPEND(uslcom, ucom, 1, 1, 1);
281MODULE_DEPEND(uslcom, usb, 1, 1, 1);
282MODULE_VERSION(uslcom, 1);
283
284static int
285uslcom_probe(device_t dev)
286{
287	struct usb_attach_arg *uaa = device_get_ivars(dev);
288
289	DPRINTFN(11, "\n");
290
291	if (uaa->usb_mode != USB_MODE_HOST) {
292		return (ENXIO);
293	}
294	if (uaa->info.bConfigIndex != USLCOM_CONFIG_INDEX) {
295		return (ENXIO);
296	}
297	if (uaa->info.bIfaceIndex != USLCOM_IFACE_INDEX) {
298		return (ENXIO);
299	}
300	return (usbd_lookup_id_by_uaa(uslcom_devs, sizeof(uslcom_devs), uaa));
301}
302
303static int
304uslcom_attach(device_t dev)
305{
306	struct usb_attach_arg *uaa = device_get_ivars(dev);
307	struct uslcom_softc *sc = device_get_softc(dev);
308	int error;
309
310	DPRINTFN(11, "\n");
311
312	device_set_usb_desc(dev);
313	mtx_init(&sc->sc_mtx, "uslcom", NULL, MTX_DEF);
314
315	sc->sc_udev = uaa->device;
316
317	error = usbd_transfer_setup(uaa->device,
318	    &uaa->info.bIfaceIndex, sc->sc_xfer, uslcom_config,
319	    USLCOM_N_TRANSFER, sc, &sc->sc_mtx);
320	if (error) {
321		DPRINTF("one or more missing USB endpoints, "
322		    "error=%s\n", usbd_errstr(error));
323		goto detach;
324	}
325	/* clear stall at first run */
326	mtx_lock(&sc->sc_mtx);
327	usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_WR]);
328	usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_RD]);
329	mtx_unlock(&sc->sc_mtx);
330
331	error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
332	    &uslcom_callback, &sc->sc_mtx);
333	if (error) {
334		goto detach;
335	}
336	ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
337
338	return (0);
339
340detach:
341	uslcom_detach(dev);
342	return (ENXIO);
343}
344
345static int
346uslcom_detach(device_t dev)
347{
348	struct uslcom_softc *sc = device_get_softc(dev);
349
350	DPRINTF("sc=%p\n", sc);
351
352	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
353	usbd_transfer_unsetup(sc->sc_xfer, USLCOM_N_TRANSFER);
354	mtx_destroy(&sc->sc_mtx);
355
356	return (0);
357}
358
359static void
360uslcom_open(struct ucom_softc *ucom)
361{
362	struct uslcom_softc *sc = ucom->sc_parent;
363	struct usb_device_request req;
364
365	req.bmRequestType = USLCOM_WRITE;
366	req.bRequest = USLCOM_UART;
367	USETW(req.wValue, USLCOM_UART_ENABLE);
368	USETW(req.wIndex, USLCOM_PORT_NO);
369	USETW(req.wLength, 0);
370
371        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
372	    &req, NULL, 0, 1000)) {
373		DPRINTF("UART enable failed (ignored)\n");
374	}
375}
376
377static void
378uslcom_close(struct ucom_softc *ucom)
379{
380	struct uslcom_softc *sc = ucom->sc_parent;
381	struct usb_device_request req;
382
383	req.bmRequestType = USLCOM_WRITE;
384	req.bRequest = USLCOM_UART;
385	USETW(req.wValue, USLCOM_UART_DISABLE);
386	USETW(req.wIndex, USLCOM_PORT_NO);
387	USETW(req.wLength, 0);
388
389        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
390	    &req, NULL, 0, 1000)) {
391		DPRINTF("UART disable failed (ignored)\n");
392	}
393}
394
395static void
396uslcom_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
397{
398        struct uslcom_softc *sc = ucom->sc_parent;
399	struct usb_device_request req;
400	uint16_t ctl;
401
402        DPRINTF("onoff = %d\n", onoff);
403
404	ctl = onoff ? USLCOM_CTRL_DTR_ON : 0;
405	ctl |= USLCOM_CTRL_DTR_SET;
406
407	req.bmRequestType = USLCOM_WRITE;
408	req.bRequest = USLCOM_CTRL;
409	USETW(req.wValue, ctl);
410	USETW(req.wIndex, USLCOM_PORT_NO);
411	USETW(req.wLength, 0);
412
413        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
414	    &req, NULL, 0, 1000)) {
415		DPRINTF("Setting DTR failed (ignored)\n");
416	}
417}
418
419static void
420uslcom_set_rts(struct ucom_softc *ucom, uint8_t onoff)
421{
422        struct uslcom_softc *sc = ucom->sc_parent;
423	struct usb_device_request req;
424	uint16_t ctl;
425
426        DPRINTF("onoff = %d\n", onoff);
427
428	ctl = onoff ? USLCOM_CTRL_RTS_ON : 0;
429	ctl |= USLCOM_CTRL_RTS_SET;
430
431	req.bmRequestType = USLCOM_WRITE;
432	req.bRequest = USLCOM_CTRL;
433	USETW(req.wValue, ctl);
434	USETW(req.wIndex, USLCOM_PORT_NO);
435	USETW(req.wLength, 0);
436
437        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
438	    &req, NULL, 0, 1000)) {
439		DPRINTF("Setting DTR failed (ignored)\n");
440	}
441}
442
443static int
444uslcom_pre_param(struct ucom_softc *ucom, struct termios *t)
445{
446	if (t->c_ospeed <= 0 || t->c_ospeed > 921600)
447		return (EINVAL);
448	return (0);
449}
450
451static void
452uslcom_param(struct ucom_softc *ucom, struct termios *t)
453{
454	struct uslcom_softc *sc = ucom->sc_parent;
455	struct usb_device_request req;
456	uint16_t data;
457
458	DPRINTF("\n");
459
460	req.bmRequestType = USLCOM_WRITE;
461	req.bRequest = USLCOM_BAUD_RATE;
462	USETW(req.wValue, USLCOM_BAUD_REF / t->c_ospeed);
463	USETW(req.wIndex, USLCOM_PORT_NO);
464	USETW(req.wLength, 0);
465
466        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
467	    &req, NULL, 0, 1000)) {
468		DPRINTF("Set baudrate failed (ignored)\n");
469	}
470
471	if (t->c_cflag & CSTOPB)
472		data = USLCOM_STOP_BITS_2;
473	else
474		data = USLCOM_STOP_BITS_1;
475	if (t->c_cflag & PARENB) {
476		if (t->c_cflag & PARODD)
477			data |= USLCOM_PARITY_ODD;
478		else
479			data |= USLCOM_PARITY_EVEN;
480	} else
481		data |= USLCOM_PARITY_NONE;
482	switch (t->c_cflag & CSIZE) {
483	case CS5:
484		data |= USLCOM_SET_DATA_BITS(5);
485		break;
486	case CS6:
487		data |= USLCOM_SET_DATA_BITS(6);
488		break;
489	case CS7:
490		data |= USLCOM_SET_DATA_BITS(7);
491		break;
492	case CS8:
493		data |= USLCOM_SET_DATA_BITS(8);
494		break;
495	}
496
497	req.bmRequestType = USLCOM_WRITE;
498	req.bRequest = USLCOM_DATA;
499	USETW(req.wValue, data);
500	USETW(req.wIndex, USLCOM_PORT_NO);
501	USETW(req.wLength, 0);
502
503        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
504	    &req, NULL, 0, 1000)) {
505		DPRINTF("Set format failed (ignored)\n");
506	}
507	return;
508}
509
510static void
511uslcom_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
512{
513	struct uslcom_softc *sc = ucom->sc_parent;
514
515	DPRINTF("\n");
516
517	*lsr = sc->sc_lsr;
518	*msr = sc->sc_msr;
519}
520
521static void
522uslcom_set_break(struct ucom_softc *ucom, uint8_t onoff)
523{
524        struct uslcom_softc *sc = ucom->sc_parent;
525	struct usb_device_request req;
526	uint16_t brk = onoff ? USLCOM_BREAK_ON : USLCOM_BREAK_OFF;
527
528	req.bmRequestType = USLCOM_WRITE;
529	req.bRequest = USLCOM_BREAK;
530	USETW(req.wValue, brk);
531	USETW(req.wIndex, USLCOM_PORT_NO);
532	USETW(req.wLength, 0);
533
534        if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
535	    &req, NULL, 0, 1000)) {
536		DPRINTF("Set BREAK failed (ignored)\n");
537	}
538}
539
540static void
541uslcom_write_callback(struct usb_xfer *xfer, usb_error_t error)
542{
543	struct uslcom_softc *sc = usbd_xfer_softc(xfer);
544	struct usb_page_cache *pc;
545	uint32_t actlen;
546
547	switch (USB_GET_STATE(xfer)) {
548	case USB_ST_SETUP:
549	case USB_ST_TRANSFERRED:
550tr_setup:
551		pc = usbd_xfer_get_frame(xfer, 0);
552		if (ucom_get_data(&sc->sc_ucom, pc, 0,
553		    USLCOM_BULK_BUF_SIZE, &actlen)) {
554
555			DPRINTF("actlen = %d\n", actlen);
556
557			usbd_xfer_set_frame_len(xfer, 0, actlen);
558			usbd_transfer_submit(xfer);
559		}
560		return;
561
562	default:			/* Error */
563		if (error != USB_ERR_CANCELLED) {
564			/* try to clear stall first */
565			usbd_xfer_set_stall(xfer);
566			goto tr_setup;
567		}
568		return;
569	}
570}
571
572static void
573uslcom_read_callback(struct usb_xfer *xfer, usb_error_t error)
574{
575	struct uslcom_softc *sc = usbd_xfer_softc(xfer);
576	struct usb_page_cache *pc;
577	int actlen;
578
579	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
580
581	switch (USB_GET_STATE(xfer)) {
582	case USB_ST_TRANSFERRED:
583		pc = usbd_xfer_get_frame(xfer, 0);
584		ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
585
586	case USB_ST_SETUP:
587tr_setup:
588		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
589		usbd_transfer_submit(xfer);
590		return;
591
592	default:			/* Error */
593		if (error != USB_ERR_CANCELLED) {
594			/* try to clear stall first */
595			usbd_xfer_set_stall(xfer);
596			goto tr_setup;
597		}
598		return;
599	}
600}
601
602static void
603uslcom_start_read(struct ucom_softc *ucom)
604{
605	struct uslcom_softc *sc = ucom->sc_parent;
606
607	/* start read endpoint */
608	usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_RD]);
609}
610
611static void
612uslcom_stop_read(struct ucom_softc *ucom)
613{
614	struct uslcom_softc *sc = ucom->sc_parent;
615
616	/* stop read endpoint */
617	usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_RD]);
618}
619
620static void
621uslcom_start_write(struct ucom_softc *ucom)
622{
623	struct uslcom_softc *sc = ucom->sc_parent;
624
625	usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_WR]);
626}
627
628static void
629uslcom_stop_write(struct ucom_softc *ucom)
630{
631	struct uslcom_softc *sc = ucom->sc_parent;
632
633	usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_WR]);
634}
635
636static void
637uslcom_poll(struct ucom_softc *ucom)
638{
639	struct uslcom_softc *sc = ucom->sc_parent;
640	usbd_transfer_poll(sc->sc_xfer, USLCOM_N_TRANSFER);
641}
642