u3g.c revision 192499 
1/*
2 * Copyright (c) 2008 AnyWi Technologies
3 * Author: Andrea Guzzo <aguzzo@anywi.com>
4 * * based on uark.c 1.1 2006/08/14 08:30:22 jsg *
5 * * parts from ubsa.c 183348 2008-09-25 12:00:56Z phk *
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 * $FreeBSD: head/sys/dev/usb/serial/u3g.c 192499 2009-05-21 00:04:17Z thompsa $
20 */
21
22/*
23 * NOTE:
24 *
25 * - The detour through the tty layer is ridiculously expensive wrt
26 *   buffering due to the high speeds.
27 *
28 *   We should consider adding a simple r/w device which allows
29 *   attaching of PPP in a more efficient way.
30 *
31 */
32
33#include "usbdevs.h"
34#include <dev/usb/usb.h>
35#include <dev/usb/usb_mfunc.h>
36#include <dev/usb/usb_error.h>
37
38#define	USB_DEBUG_VAR u3g_debug
39
40#include <dev/usb/usb_core.h>
41#include <dev/usb/usb_debug.h>
42#include <dev/usb/usb_process.h>
43#include <dev/usb/usb_request.h>
44#include <dev/usb/usb_lookup.h>
45#include <dev/usb/usb_util.h>
46#include <dev/usb/usb_busdma.h>
47#include <dev/usb/usb_msctest.h>
48#include <dev/usb/usb_dynamic.h>
49#include <dev/usb/usb_device.h>
50
51#include <dev/usb/serial/usb_serial.h>
52
53#if USB_DEBUG
54static int u3g_debug = 0;
55
56SYSCTL_NODE(_hw_usb2, OID_AUTO, u3g, CTLFLAG_RW, 0, "USB 3g");
57SYSCTL_INT(_hw_usb2_u3g, OID_AUTO, debug, CTLFLAG_RW,
58    &u3g_debug, 0, "Debug level");
59#endif
60
61#define	U3G_MAXPORTS		8
62#define	U3G_CONFIG_INDEX	0
63#define	U3G_BSIZE		2048
64
65#define	U3GSP_GPRS		0
66#define	U3GSP_EDGE		1
67#define	U3GSP_CDMA		2
68#define	U3GSP_UMTS		3
69#define	U3GSP_HSDPA		4
70#define	U3GSP_HSUPA		5
71#define	U3GSP_HSPA		6
72#define	U3GSP_MAX		7
73
74#define	U3GFL_HUAWEI_INIT	0x0001	/* Init command required */
75#define	U3GFL_SCSI_EJECT	0x0002	/* SCSI eject command required */
76#define	U3GFL_SIERRA_INIT	0x0004	/* Init command required */
77#define	U3GFL_SAEL_M460_INIT	0x0008	/* Init device */
78
79enum {
80	U3G_BULK_WR,
81	U3G_BULK_RD,
82	U3G_N_TRANSFER,
83};
84
85struct u3g_softc {
86	struct usb2_com_super_softc sc_super_ucom;
87	struct usb2_com_softc sc_ucom[U3G_MAXPORTS];
88
89	struct usb2_xfer *sc_xfer[U3G_MAXPORTS][U3G_N_TRANSFER];
90	struct usb2_device *sc_udev;
91	struct mtx sc_mtx;
92
93	uint8_t	sc_lsr;			/* local status register */
94	uint8_t	sc_msr;			/* U3G status register */
95	uint8_t	sc_numports;
96};
97
98static device_probe_t u3g_probe;
99static device_attach_t u3g_attach;
100static device_detach_t u3g_detach;
101
102static usb2_callback_t u3g_write_callback;
103static usb2_callback_t u3g_read_callback;
104
105static void u3g_start_read(struct usb2_com_softc *ucom);
106static void u3g_stop_read(struct usb2_com_softc *ucom);
107static void u3g_start_write(struct usb2_com_softc *ucom);
108static void u3g_stop_write(struct usb2_com_softc *ucom);
109
110static int u3g_driver_loaded(struct module *mod, int what, void *arg);
111
112static const struct usb2_config u3g_config[U3G_N_TRANSFER] = {
113
114	[U3G_BULK_WR] = {
115		.type = UE_BULK,
116		.endpoint = UE_ADDR_ANY,
117		.direction = UE_DIR_OUT,
118		.bufsize = U3G_BSIZE,/* bytes */
119		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
120		.callback = &u3g_write_callback,
121	},
122
123	[U3G_BULK_RD] = {
124		.type = UE_BULK,
125		.endpoint = UE_ADDR_ANY,
126		.direction = UE_DIR_IN,
127		.bufsize = U3G_BSIZE,/* bytes */
128		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
129		.callback = &u3g_read_callback,
130	},
131};
132
133static const struct usb2_com_callback u3g_callback = {
134	.usb2_com_start_read = &u3g_start_read,
135	.usb2_com_stop_read = &u3g_stop_read,
136	.usb2_com_start_write = &u3g_start_write,
137	.usb2_com_stop_write = &u3g_stop_write,
138};
139
140static device_method_t u3g_methods[] = {
141	DEVMETHOD(device_probe, u3g_probe),
142	DEVMETHOD(device_attach, u3g_attach),
143	DEVMETHOD(device_detach, u3g_detach),
144	{0, 0}
145};
146
147static devclass_t u3g_devclass;
148
149static driver_t u3g_driver = {
150	.name = "u3g",
151	.methods = u3g_methods,
152	.size = sizeof(struct u3g_softc),
153};
154
155DRIVER_MODULE(u3g, uhub, u3g_driver, u3g_devclass, u3g_driver_loaded, 0);
156MODULE_DEPEND(u3g, ucom, 1, 1, 1);
157MODULE_DEPEND(u3g, usb, 1, 1, 1);
158
159static const struct usb2_device_id u3g_devs[] = {
160#define	U3G_DEV(v,p,i) { USB_VPI(USB_VENDOR_##v, USB_PRODUCT_##v##_##p, i) }
161	/* OEM: Option */
162	U3G_DEV(OPTION, GT3G, 0),
163	U3G_DEV(OPTION, GT3GQUAD, 0),
164	U3G_DEV(OPTION, GT3GPLUS, 0),
165	U3G_DEV(OPTION, GTMAX36, 0),
166	U3G_DEV(OPTION, GTMAXHSUPA, 0),
167	U3G_DEV(OPTION, VODAFONEMC3G, 0),
168	/* OEM: Qualcomm, Inc. */
169	U3G_DEV(QUALCOMMINC, ZTE_STOR, U3GFL_SCSI_EJECT),
170	U3G_DEV(QUALCOMMINC, CDMA_MSM, U3GFL_SCSI_EJECT),
171	/* OEM: Huawei */
172	U3G_DEV(HUAWEI, MOBILE, U3GFL_HUAWEI_INIT),
173	U3G_DEV(HUAWEI, E220, U3GFL_HUAWEI_INIT),
174	/* OEM: Novatel */
175	U3G_DEV(NOVATEL, CDMA_MODEM, 0),
176	U3G_DEV(NOVATEL, ES620, 0),
177	U3G_DEV(NOVATEL, MC950D, 0),
178	U3G_DEV(NOVATEL, U720, 0),
179	U3G_DEV(NOVATEL, U727, 0),
180	U3G_DEV(NOVATEL, U740, 0),
181	U3G_DEV(NOVATEL, U740_2, 0),
182	U3G_DEV(NOVATEL, U870, 0),
183	U3G_DEV(NOVATEL, V620, 0),
184	U3G_DEV(NOVATEL, V640, 0),
185	U3G_DEV(NOVATEL, V720, 0),
186	U3G_DEV(NOVATEL, V740, 0),
187	U3G_DEV(NOVATEL, X950D, 0),
188	U3G_DEV(NOVATEL, XU870, 0),
189	U3G_DEV(NOVATEL, ZEROCD, U3GFL_SCSI_EJECT),
190	U3G_DEV(DELL, U740, 0),
191	/* OEM: Merlin */
192	U3G_DEV(MERLIN, V620, 0),
193	/* OEM: Sierra Wireless: */
194	U3G_DEV(SIERRA, AIRCARD580, 0),
195	U3G_DEV(SIERRA, AIRCARD595, 0),
196	U3G_DEV(SIERRA, AC595U, 0),
197	U3G_DEV(SIERRA, AC597E, 0),
198	U3G_DEV(SIERRA, C597, 0),
199	U3G_DEV(SIERRA, AC880, 0),
200	U3G_DEV(SIERRA, AC880E, 0),
201	U3G_DEV(SIERRA, AC880U, 0),
202	U3G_DEV(SIERRA, AC881, 0),
203	U3G_DEV(SIERRA, AC881E, 0),
204	U3G_DEV(SIERRA, AC881U, 0),
205	U3G_DEV(SIERRA, AC885U, 0),
206	U3G_DEV(SIERRA, EM5625, 0),
207	U3G_DEV(SIERRA, MC5720, 0),
208	U3G_DEV(SIERRA, MC5720_2, 0),
209	U3G_DEV(SIERRA, MC5725, 0),
210	U3G_DEV(SIERRA, MINI5725, 0),
211	U3G_DEV(SIERRA, AIRCARD875, 0),
212	U3G_DEV(SIERRA, MC8755, 0),
213	U3G_DEV(SIERRA, MC8755_2, 0),
214	U3G_DEV(SIERRA, MC8755_3, 0),
215	U3G_DEV(SIERRA, MC8765, 0),
216	U3G_DEV(SIERRA, AC875U, 0),
217	U3G_DEV(SIERRA, MC8775_2, 0),
218	U3G_DEV(SIERRA, MC8780, 0),
219	U3G_DEV(SIERRA, MC8781, 0),
220	U3G_DEV(HP, HS2300, 0),
221	/* Sierra TruInstaller device ID */
222	U3G_DEV(SIERRA, TRUINSTALL, U3GFL_SIERRA_INIT),
223	/* PRUEBA SILABS */
224	U3G_DEV(SILABS, SAEL, U3GFL_SAEL_M460_INIT),
225};
226
227static void
228u3g_sierra_init(struct usb2_device *udev)
229{
230	struct usb2_device_request req;
231
232	DPRINTFN(0, "\n");
233
234	req.bmRequestType = UT_VENDOR;
235	req.bRequest = UR_SET_INTERFACE;
236	USETW(req.wValue, UF_DEVICE_REMOTE_WAKEUP);
237	USETW(req.wIndex, UHF_PORT_CONNECTION);
238	USETW(req.wLength, 0);
239
240	if (usb2_do_request_flags(udev, NULL, &req,
241	    NULL, 0, NULL, USB_MS_HZ)) {
242		/* ignore any errors */
243	}
244	return;
245}
246
247static void
248u3g_huawei_init(struct usb2_device *udev)
249{
250	struct usb2_device_request req;
251
252	DPRINTFN(0, "\n");
253
254	req.bmRequestType = UT_WRITE_DEVICE;
255	req.bRequest = UR_SET_FEATURE;
256	USETW(req.wValue, UF_DEVICE_REMOTE_WAKEUP);
257	USETW(req.wIndex, UHF_PORT_SUSPEND);
258	USETW(req.wLength, 0);
259
260	if (usb2_do_request_flags(udev, NULL, &req,
261	    NULL, 0, NULL, USB_MS_HZ)) {
262		/* ignore any errors */
263	}
264	return;
265}
266
267static void
268u3g_sael_m460_init(struct usb2_device *udev)
269{
270	static const uint8_t setup[][24] = {
271	     { 0x41, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
272	     { 0x41, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 },
273	     { 0x41, 0x13, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
274	       0x01, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
275	       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
276	     { 0xc1, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x40, 0x02 },
277	     { 0xc1, 0x08, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00 },
278	     { 0x41, 0x07, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00 },
279	     { 0xc1, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 },
280	     { 0x41, 0x01, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00 },
281	     { 0x41, 0x07, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00 },
282	     { 0x41, 0x03, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00 },
283	     { 0x41, 0x19, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00,
284	       0x00, 0x00, 0x00, 0x00, 0x11, 0x13 },
285	     { 0x41, 0x13, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
286	       0x09, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
287	       0x0a, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00 },
288	     { 0x41, 0x12, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00 },
289	     { 0x41, 0x01, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00 },
290	     { 0x41, 0x07, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00 },
291	     { 0x41, 0x03, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00 },
292	     { 0x41, 0x19, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00,
293	       0x00, 0x00, 0x00, 0x00, 0x11, 0x13 },
294	     { 0x41, 0x13, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
295	       0x09, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
296	       0x0a, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00 },
297	     { 0x41, 0x07, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00 },
298	};
299
300	struct usb2_device_request req;
301	usb2_error_t err;
302	uint16_t len;
303	uint8_t buf[0x300];
304	uint8_t n;
305
306	DPRINTFN(1, "\n");
307
308	if (usb2_req_set_alt_interface_no(udev, NULL, 0, 0)) {
309		DPRINTFN(0, "Alt setting 0 failed\n");
310		return;
311	}
312
313	for (n = 0; n != (sizeof(setup)/sizeof(setup[0])); n++) {
314
315		memcpy(&req, setup[n], sizeof(req));
316
317		len = UGETW(req.wLength);
318		if (req.bmRequestType & UE_DIR_IN) {
319			if (len > sizeof(buf)) {
320				DPRINTFN(0, "too small buffer\n");
321				continue;
322			}
323			err = usb2_do_request(udev, NULL, &req, buf);
324		} else {
325			if (len > (sizeof(setup[0]) - 8)) {
326				DPRINTFN(0, "too small buffer\n");
327				continue;
328			}
329			err = usb2_do_request(udev, NULL, &req,
330			    __DECONST(uint8_t *, &setup[n][8]));
331		}
332		if (err) {
333			DPRINTFN(1, "request %u failed\n",
334			    (unsigned int)n);
335			/*
336			 * Some of the requests will fail. Stop doing
337			 * requests when we are getting timeouts so
338			 * that we don't block the explore/attach
339			 * thread forever.
340			 */
341			if (err == USB_ERR_TIMEOUT)
342				break;
343		}
344	}
345}
346
347static int
348u3g_lookup_huawei(struct usb2_attach_arg *uaa)
349{
350	/* Calling the lookup function will also set the driver info! */
351	return (usb2_lookup_id_by_uaa(u3g_devs, sizeof(u3g_devs), uaa));
352}
353
354/*
355 * The following function handles 3G modem devices (E220, Mobile,
356 * etc.) with auto-install flash disks for Windows/MacOSX on the first
357 * interface.  After some command or some delay they change appearance
358 * to a modem.
359 */
360static usb2_error_t
361u3g_test_huawei_autoinst(struct usb2_device *udev,
362    struct usb2_attach_arg *uaa)
363{
364	struct usb2_interface *iface;
365	struct usb2_interface_descriptor *id;
366	uint32_t flags;
367
368	if (udev == NULL) {
369		return (USB_ERR_INVAL);
370	}
371	iface = usb2_get_iface(udev, 0);
372	if (iface == NULL) {
373		return (USB_ERR_INVAL);
374	}
375	id = iface->idesc;
376	if (id == NULL) {
377		return (USB_ERR_INVAL);
378	}
379	if (id->bInterfaceClass != UICLASS_MASS) {
380		return (USB_ERR_INVAL);
381	}
382	if (u3g_lookup_huawei(uaa)) {
383		/* no device match */
384		return (USB_ERR_INVAL);
385	}
386	flags = USB_GET_DRIVER_INFO(uaa);
387
388	if (flags & U3GFL_HUAWEI_INIT) {
389		u3g_huawei_init(udev);
390	} else if (flags & U3GFL_SCSI_EJECT) {
391		return (usb2_test_autoinstall(udev, 0, 1));
392	} else if (flags & U3GFL_SIERRA_INIT) {
393		u3g_sierra_init(udev);
394	} else {
395		/* no quirks */
396		return (USB_ERR_INVAL);
397	}
398	return (0);			/* success */
399}
400
401static int
402u3g_driver_loaded(struct module *mod, int what, void *arg)
403{
404	switch (what) {
405	case MOD_LOAD:
406		/* register our autoinstall handler */
407		usb2_test_huawei_autoinst_p = &u3g_test_huawei_autoinst;
408		break;
409	case MOD_UNLOAD:
410		usb2_test_huawei_unload(NULL);
411		break;
412	default:
413		return (EOPNOTSUPP);
414	}
415 	return (0);
416}
417
418static int
419u3g_probe(device_t self)
420{
421	struct usb2_attach_arg *uaa = device_get_ivars(self);
422
423	if (uaa->usb_mode != USB_MODE_HOST) {
424		return (ENXIO);
425	}
426	if (uaa->info.bConfigIndex != U3G_CONFIG_INDEX) {
427		return (ENXIO);
428	}
429	if (uaa->info.bInterfaceClass != UICLASS_VENDOR) {
430		return (ENXIO);
431	}
432	return (u3g_lookup_huawei(uaa));
433}
434
435static int
436u3g_attach(device_t dev)
437{
438	struct usb2_config u3g_config_tmp[U3G_N_TRANSFER];
439	struct usb2_attach_arg *uaa = device_get_ivars(dev);
440	struct u3g_softc *sc = device_get_softc(dev);
441	struct usb2_interface *iface;
442	struct usb2_interface_descriptor *id;
443	uint32_t iface_valid;
444	int error, flags, nports;
445	int ep, n;
446	uint8_t i;
447
448	DPRINTF("sc=%p\n", sc);
449
450	flags = USB_GET_DRIVER_INFO(uaa);
451
452	if (flags & U3GFL_SAEL_M460_INIT)
453		u3g_sael_m460_init(uaa->device);
454
455	/* copy in USB config */
456	for (n = 0; n != U3G_N_TRANSFER; n++)
457		u3g_config_tmp[n] = u3g_config[n];
458
459	device_set_usb2_desc(dev);
460	mtx_init(&sc->sc_mtx, "u3g", NULL, MTX_DEF);
461
462	sc->sc_udev = uaa->device;
463
464	/* Claim all interfaces on the device */
465	iface_valid = 0;
466	for (i = uaa->info.bIfaceIndex; i < USB_IFACE_MAX; i++) {
467		iface = usb2_get_iface(uaa->device, i);
468		if (iface == NULL)
469			break;
470		id = usb2_get_interface_descriptor(iface);
471		if (id == NULL || id->bInterfaceClass != UICLASS_VENDOR)
472			continue;
473		usb2_set_parent_iface(uaa->device, i, uaa->info.bIfaceIndex);
474		iface_valid |= (1<<i);
475	}
476
477	i = 0;		/* interface index */
478	ep = 0;		/* endpoint index */
479	nports = 0;	/* number of ports */
480	while (i < USB_IFACE_MAX) {
481		if ((iface_valid & (1<<i)) == 0) {
482			i++;
483			continue;
484		}
485
486		/* update BULK endpoint index */
487		for (n = 0; n < U3G_N_TRANSFER; n++)
488			u3g_config_tmp[n].ep_index = ep;
489
490		/* try to allocate a set of BULK endpoints */
491		error = usb2_transfer_setup(uaa->device, &i,
492		    sc->sc_xfer[nports], u3g_config_tmp, U3G_N_TRANSFER,
493		    &sc->sc_ucom[nports], &sc->sc_mtx);
494		if (error) {
495			/* next interface */
496			i++;
497			ep = 0;
498			continue;
499		}
500
501		/* set stall by default */
502		mtx_lock(&sc->sc_mtx);
503		usb2_transfer_set_stall(sc->sc_xfer[nports][U3G_BULK_WR]);
504		usb2_transfer_set_stall(sc->sc_xfer[nports][U3G_BULK_RD]);
505		mtx_unlock(&sc->sc_mtx);
506
507		nports++;	/* found one port */
508		ep++;
509		if (nports == U3G_MAXPORTS)
510			break;
511	}
512	if (nports == 0) {
513		device_printf(dev, "no ports found\n");
514		goto detach;
515	}
516	sc->sc_numports = nports;
517
518	error = usb2_com_attach(&sc->sc_super_ucom, sc->sc_ucom,
519	    sc->sc_numports, sc, &u3g_callback, &sc->sc_mtx);
520	if (error) {
521		DPRINTF("usb2_com_attach failed\n");
522		goto detach;
523	}
524	if (sc->sc_numports > 1)
525		device_printf(dev, "Found %u ports.\n", sc->sc_numports);
526	return (0);
527
528detach:
529	u3g_detach(dev);
530	return (ENXIO);
531}
532
533static int
534u3g_detach(device_t dev)
535{
536	struct u3g_softc *sc = device_get_softc(dev);
537	uint8_t m;
538
539	DPRINTF("sc=%p\n", sc);
540
541	/* NOTE: It is not dangerous to detach more ports than attached! */
542	usb2_com_detach(&sc->sc_super_ucom, sc->sc_ucom, U3G_MAXPORTS);
543
544	for (m = 0; m != U3G_MAXPORTS; m++)
545		usb2_transfer_unsetup(sc->sc_xfer[m], U3G_N_TRANSFER);
546	mtx_destroy(&sc->sc_mtx);
547
548	return (0);
549}
550
551static void
552u3g_start_read(struct usb2_com_softc *ucom)
553{
554	struct u3g_softc *sc = ucom->sc_parent;
555
556	/* start read endpoint */
557	usb2_transfer_start(sc->sc_xfer[ucom->sc_local_unit][U3G_BULK_RD]);
558	return;
559}
560
561static void
562u3g_stop_read(struct usb2_com_softc *ucom)
563{
564	struct u3g_softc *sc = ucom->sc_parent;
565
566	/* stop read endpoint */
567	usb2_transfer_stop(sc->sc_xfer[ucom->sc_local_unit][U3G_BULK_RD]);
568	return;
569}
570
571static void
572u3g_start_write(struct usb2_com_softc *ucom)
573{
574	struct u3g_softc *sc = ucom->sc_parent;
575
576	usb2_transfer_start(sc->sc_xfer[ucom->sc_local_unit][U3G_BULK_WR]);
577	return;
578}
579
580static void
581u3g_stop_write(struct usb2_com_softc *ucom)
582{
583	struct u3g_softc *sc = ucom->sc_parent;
584
585	usb2_transfer_stop(sc->sc_xfer[ucom->sc_local_unit][U3G_BULK_WR]);
586	return;
587}
588
589static void
590u3g_write_callback(struct usb2_xfer *xfer)
591{
592	struct usb2_com_softc *ucom = xfer->priv_sc;
593	uint32_t actlen;
594
595	switch (USB_GET_STATE(xfer)) {
596	case USB_ST_TRANSFERRED:
597	case USB_ST_SETUP:
598tr_setup:
599		if (usb2_com_get_data(ucom, xfer->frbuffers, 0,
600		    U3G_BSIZE, &actlen)) {
601			xfer->frlengths[0] = actlen;
602			usb2_start_hardware(xfer);
603		}
604		break;
605
606	default:			/* Error */
607		if (xfer->error != USB_ERR_CANCELLED) {
608			/* do a builtin clear-stall */
609			xfer->flags.stall_pipe = 1;
610			goto tr_setup;
611		}
612		break;
613	}
614	return;
615}
616
617static void
618u3g_read_callback(struct usb2_xfer *xfer)
619{
620	struct usb2_com_softc *ucom = xfer->priv_sc;
621
622	switch (USB_GET_STATE(xfer)) {
623	case USB_ST_TRANSFERRED:
624		usb2_com_put_data(ucom, xfer->frbuffers, 0, xfer->actlen);
625
626	case USB_ST_SETUP:
627tr_setup:
628		xfer->frlengths[0] = xfer->max_data_length;
629		usb2_start_hardware(xfer);
630		break;
631
632	default:			/* Error */
633		if (xfer->error != USB_ERR_CANCELLED) {
634			/* do a builtin clear-stall */
635			xfer->flags.stall_pipe = 1;
636			goto tr_setup;
637		}
638		break;
639	}
640	return;
641}
642