xref: /openbsd-src/sys/dev/usb/uftdi.c (revision 8500990981f885cbe5e6a4958549cacc238b5ae6)
1 /*	$OpenBSD: uftdi.c,v 1.13 2003/10/04 01:01:34 deraadt Exp $ 	*/
2 /*	$NetBSD: uftdi.c,v 1.14 2003/02/23 04:20:07 simonb Exp $	*/
3 
4 /*
5  * Copyright (c) 2000 The NetBSD Foundation, Inc.
6  * All rights reserved.
7  *
8  * This code is derived from software contributed to The NetBSD Foundation
9  * by Lennart Augustsson (lennart@augustsson.net).
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  *    must display the following acknowledgement:
21  *        This product includes software developed by the NetBSD
22  *        Foundation, Inc. and its contributors.
23  * 4. Neither the name of The NetBSD Foundation nor the names of its
24  *    contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGE.
38  */
39 
40 /*
41  * FTDI FT8U100AX serial adapter driver
42  */
43 
44 /*
45  * XXX This driver will not support multiple serial ports.
46  * XXX The ucom layer needs to be extended first.
47  */
48 
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/device.h>
53 #include <sys/conf.h>
54 #include <sys/tty.h>
55 
56 #include <dev/usb/usb.h>
57 #include <dev/usb/usbhid.h>
58 
59 #include <dev/usb/usbdi.h>
60 #include <dev/usb/usbdi_util.h>
61 #include <dev/usb/usbdevs.h>
62 
63 #include <dev/usb/ucomvar.h>
64 
65 #include <dev/usb/uftdireg.h>
66 
67 #ifdef UFTDI_DEBUG
68 #define DPRINTF(x)	if (uftdidebug) printf x
69 #define DPRINTFN(n,x)	if (uftdidebug>(n)) printf x
70 int uftdidebug = 0;
71 #else
72 #define DPRINTF(x)
73 #define DPRINTFN(n,x)
74 #endif
75 
76 #define UFTDI_CONFIG_INDEX	0
77 #define UFTDI_IFACE_INDEX	0
78 
79 
80 /*
81  * These are the maximum number of bytes transferred per frame.
82  * The output buffer size cannot be increased due to the size encoding.
83  */
84 #define UFTDIIBUFSIZE 64
85 #define UFTDIOBUFSIZE 64
86 
87 struct uftdi_softc {
88 	USBBASEDEVICE		sc_dev;		/* base device */
89 	usbd_device_handle	sc_udev;	/* device */
90 	usbd_interface_handle	sc_iface;	/* interface */
91 
92 	enum uftdi_type		sc_type;
93 	u_int			sc_hdrlen;
94 
95 	u_char			sc_msr;
96 	u_char			sc_lsr;
97 
98 	device_ptr_t		sc_subdev;
99 
100 	u_char			sc_dying;
101 
102 	u_int			last_lcr;
103 };
104 
105 Static void	uftdi_get_status(void *, int portno, u_char *lsr, u_char *msr);
106 Static void	uftdi_set(void *, int, int, int);
107 Static int	uftdi_param(void *, int, struct termios *);
108 Static int	uftdi_open(void *sc, int portno);
109 Static void	uftdi_read(void *sc, int portno, u_char **ptr,
110 			   u_int32_t *count);
111 Static void	uftdi_write(void *sc, int portno, u_char *to, u_char *from,
112 			    u_int32_t *count);
113 Static void	uftdi_break(void *sc, int portno, int onoff);
114 
115 struct ucom_methods uftdi_methods = {
116 	uftdi_get_status,
117 	uftdi_set,
118 	uftdi_param,
119 	NULL,
120 	uftdi_open,
121 	NULL,
122 	uftdi_read,
123 	uftdi_write,
124 };
125 
126 USB_DECLARE_DRIVER(uftdi);
127 
128 USB_MATCH(uftdi)
129 {
130 	USB_MATCH_START(uftdi, uaa);
131 
132 	if (uaa->iface != NULL)
133 		return (UMATCH_NONE);
134 
135 	DPRINTFN(20,("uftdi: vendor=0x%x, product=0x%x\n",
136 		     uaa->vendor, uaa->product));
137 
138 	if (uaa->vendor == USB_VENDOR_FTDI &&
139 	    (uaa->product == USB_PRODUCT_FTDI_SERIAL_8U100AX ||
140 	     uaa->product == USB_PRODUCT_FTDI_SERIAL_8U232AM))
141 		return (UMATCH_VENDOR_PRODUCT);
142 
143 	return (UMATCH_NONE);
144 }
145 
146 USB_ATTACH(uftdi)
147 {
148 	USB_ATTACH_START(uftdi, sc, uaa);
149 	usbd_device_handle dev = uaa->device;
150 	usbd_interface_handle iface;
151 	usb_interface_descriptor_t *id;
152 	usb_endpoint_descriptor_t *ed;
153 	char devinfo[1024];
154 	char *devname = USBDEVNAME(sc->sc_dev);
155 	int i;
156 	usbd_status err;
157 	struct ucom_attach_args uca;
158 
159 	DPRINTFN(10,("\nuftdi_attach: sc=%p\n", sc));
160 
161 	/* Move the device into the configured state. */
162 	err = usbd_set_config_index(dev, UFTDI_CONFIG_INDEX, 1);
163 	if (err) {
164 		printf("\n%s: failed to set configuration, err=%s\n",
165 		       devname, usbd_errstr(err));
166 		goto bad;
167 	}
168 
169 	err = usbd_device2interface_handle(dev, UFTDI_IFACE_INDEX, &iface);
170 	if (err) {
171 		printf("\n%s: failed to get interface, err=%s\n",
172 		       devname, usbd_errstr(err));
173 		goto bad;
174 	}
175 
176 	usbd_devinfo(dev, 0, devinfo, sizeof devinfo);
177 	USB_ATTACH_SETUP;
178 	printf("%s: %s\n", devname, devinfo);
179 
180 	id = usbd_get_interface_descriptor(iface);
181 
182 	sc->sc_udev = dev;
183 	sc->sc_iface = iface;
184 
185 	switch (uaa->product) {
186 	case USB_PRODUCT_FTDI_SERIAL_8U100AX:
187 		sc->sc_type = UFTDI_TYPE_SIO;
188 		sc->sc_hdrlen = 1;
189 		break;
190 
191 	case USB_PRODUCT_FTDI_SERIAL_8U232AM:
192 		sc->sc_type = UFTDI_TYPE_8U232AM;
193 		sc->sc_hdrlen = 0;
194 		break;
195 
196 	case USB_PRODUCT_FTDI_LCD_LK202_24_USB:
197 		sc->sc_type = UFTDI_TYPE_8U232AM;
198 		sc->sc_hdrlen = 0;
199 		break;
200 
201 	default:		/* Can't happen */
202 		goto bad;
203 	}
204 
205 	uca.bulkin = uca.bulkout = -1;
206 	for (i = 0; i < id->bNumEndpoints; i++) {
207 		int addr, dir, attr;
208 		ed = usbd_interface2endpoint_descriptor(iface, i);
209 		if (ed == NULL) {
210 			printf("%s: could not read endpoint descriptor"
211 			       ": %s\n", devname, usbd_errstr(err));
212 			goto bad;
213 		}
214 
215 		addr = ed->bEndpointAddress;
216 		dir = UE_GET_DIR(ed->bEndpointAddress);
217 		attr = ed->bmAttributes & UE_XFERTYPE;
218 		if (dir == UE_DIR_IN && attr == UE_BULK)
219 			uca.bulkin = addr;
220 		else if (dir == UE_DIR_OUT && attr == UE_BULK)
221 			uca.bulkout = addr;
222 		else {
223 			printf("%s: unexpected endpoint\n", devname);
224 			goto bad;
225 		}
226 	}
227 	if (uca.bulkin == -1) {
228 		printf("%s: Could not find data bulk in\n",
229 		       USBDEVNAME(sc->sc_dev));
230 		goto bad;
231 	}
232 	if (uca.bulkout == -1) {
233 		printf("%s: Could not find data bulk out\n",
234 		       USBDEVNAME(sc->sc_dev));
235 		goto bad;
236 	}
237 
238 	uca.portno = FTDI_PIT_SIOA;
239 	/* bulkin, bulkout set above */
240 	uca.ibufsize = UFTDIIBUFSIZE;
241 	uca.obufsize = UFTDIOBUFSIZE - sc->sc_hdrlen;
242 	uca.ibufsizepad = UFTDIIBUFSIZE;
243 	uca.opkthdrlen = sc->sc_hdrlen;
244 	uca.device = dev;
245 	uca.iface = iface;
246 	uca.methods = &uftdi_methods;
247 	uca.arg = sc;
248 	uca.info = NULL;
249 
250 	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
251 			   USBDEV(sc->sc_dev));
252 
253 	DPRINTF(("uftdi: in=0x%x out=0x%x\n", uca.bulkin, uca.bulkout));
254 	sc->sc_subdev = config_found_sm(self, &uca, ucomprint, ucomsubmatch);
255 
256 	USB_ATTACH_SUCCESS_RETURN;
257 
258 bad:
259 	DPRINTF(("uftdi_attach: ATTACH ERROR\n"));
260 	sc->sc_dying = 1;
261 	USB_ATTACH_ERROR_RETURN;
262 }
263 
264 int
265 uftdi_activate(device_ptr_t self, enum devact act)
266 {
267 	struct uftdi_softc *sc = (struct uftdi_softc *)self;
268 	int rv = 0;
269 
270 	switch (act) {
271 	case DVACT_ACTIVATE:
272 		return (EOPNOTSUPP);
273 
274 	case DVACT_DEACTIVATE:
275 		if (sc->sc_subdev != NULL)
276 			rv = config_deactivate(sc->sc_subdev);
277 		sc->sc_dying = 1;
278 		break;
279 	}
280 	return (rv);
281 }
282 
283 int
284 uftdi_detach(device_ptr_t self, int flags)
285 {
286 	struct uftdi_softc *sc = (struct uftdi_softc *)self;
287 
288 	DPRINTF(("uftdi_detach: sc=%p flags=%d\n", sc, flags));
289 	sc->sc_dying = 1;
290 	if (sc->sc_subdev != NULL) {
291 		config_detach(sc->sc_subdev, flags);
292 		sc->sc_subdev = NULL;
293 	}
294 
295 	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
296 			   USBDEV(sc->sc_dev));
297 
298 	return (0);
299 }
300 
301 Static int
302 uftdi_open(void *vsc, int portno)
303 {
304 	struct uftdi_softc *sc = vsc;
305 	usb_device_request_t req;
306 	usbd_status err;
307 	struct termios t;
308 
309 	DPRINTF(("uftdi_open: sc=%p\n", sc));
310 
311 	if (sc->sc_dying)
312 		return (EIO);
313 
314 	/* Perform a full reset on the device */
315 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
316 	req.bRequest = FTDI_SIO_RESET;
317 	USETW(req.wValue, FTDI_SIO_RESET_SIO);
318 	USETW(req.wIndex, portno);
319 	USETW(req.wLength, 0);
320 	err = usbd_do_request(sc->sc_udev, &req, NULL);
321 	if (err)
322 		return (EIO);
323 
324 	/* Set 9600 baud, 2 stop bits, no parity, 8 bits */
325 	t.c_ospeed = 9600;
326 	t.c_cflag = CSTOPB | CS8;
327 	(void)uftdi_param(sc, portno, &t);
328 
329 	/* Turn on RTS/CTS flow control */
330 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
331 	req.bRequest = FTDI_SIO_SET_FLOW_CTRL;
332 	USETW(req.wValue, 0);
333 	USETW2(req.wIndex, FTDI_SIO_RTS_CTS_HS, portno);
334 	USETW(req.wLength, 0);
335 	err = usbd_do_request(sc->sc_udev, &req, NULL);
336 	if (err)
337 		return (EIO);
338 
339 	return (0);
340 }
341 
342 Static void
343 uftdi_read(void *vsc, int portno, u_char **ptr, u_int32_t *count)
344 {
345 	struct uftdi_softc *sc = vsc;
346 	u_char msr, lsr;
347 
348 	DPRINTFN(15,("uftdi_read: sc=%p, port=%d count=%d\n", sc, portno,
349 		     *count));
350 
351 	msr = FTDI_GET_MSR(*ptr);
352 	lsr = FTDI_GET_LSR(*ptr);
353 
354 #ifdef UFTDI_DEBUG
355 	if (*count != 2)
356 		DPRINTFN(10,("uftdi_read: sc=%p, port=%d count=%d data[0]="
357 			    "0x%02x\n", sc, portno, *count, (*ptr)[2]));
358 #endif
359 
360 	if (sc->sc_msr != msr ||
361 	    (sc->sc_lsr & FTDI_LSR_MASK) != (lsr & FTDI_LSR_MASK)) {
362 		DPRINTF(("uftdi_read: status change msr=0x%02x(0x%02x) "
363 			 "lsr=0x%02x(0x%02x)\n", msr, sc->sc_msr,
364 			 lsr, sc->sc_lsr));
365 		sc->sc_msr = msr;
366 		sc->sc_lsr = lsr;
367 		ucom_status_change((struct ucom_softc *)sc->sc_subdev);
368 	}
369 
370 	/* Pick up status and adjust data part. */
371 	*ptr += 2;
372 	*count -= 2;
373 }
374 
375 Static void
376 uftdi_write(void *vsc, int portno, u_char *to, u_char *from, u_int32_t *count)
377 {
378 	struct uftdi_softc *sc = vsc;
379 
380 	DPRINTFN(10,("uftdi_write: sc=%p, port=%d count=%u data[0]=0x%02x\n",
381 		     vsc, portno, *count, from[0]));
382 
383 	/* Make length tag and copy data */
384 	if (sc->sc_hdrlen > 0)
385 		*to = FTDI_OUT_TAG(*count, portno);
386 
387 	memcpy(to + sc->sc_hdrlen, from, *count);
388 	*count += sc->sc_hdrlen;
389 }
390 
391 Static void
392 uftdi_set(void *vsc, int portno, int reg, int onoff)
393 {
394 	struct uftdi_softc *sc = vsc;
395 	usb_device_request_t req;
396 	int ctl;
397 
398 	DPRINTF(("uftdi_set: sc=%p, port=%d reg=%d onoff=%d\n", vsc, portno,
399 		 reg, onoff));
400 
401 	switch (reg) {
402 	case UCOM_SET_DTR:
403 		ctl = onoff ? FTDI_SIO_SET_DTR_HIGH : FTDI_SIO_SET_DTR_LOW;
404 		break;
405 	case UCOM_SET_RTS:
406 		ctl = onoff ? FTDI_SIO_SET_RTS_HIGH : FTDI_SIO_SET_RTS_LOW;
407 		break;
408 	case UCOM_SET_BREAK:
409 		uftdi_break(sc, portno, onoff);
410 		return;
411 	default:
412 		return;
413 	}
414 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
415 	req.bRequest = FTDI_SIO_MODEM_CTRL;
416 	USETW(req.wValue, ctl);
417 	USETW(req.wIndex, portno);
418 	USETW(req.wLength, 0);
419 	DPRINTFN(2,("uftdi_set: reqtype=0x%02x req=0x%02x value=0x%04x "
420 		    "index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
421 		    UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
422 	(void)usbd_do_request(sc->sc_udev, &req, NULL);
423 }
424 
425 Static int
426 uftdi_param(void *vsc, int portno, struct termios *t)
427 {
428 	struct uftdi_softc *sc = vsc;
429 	usb_device_request_t req;
430 	usbd_status err;
431 	int rate, data, flow;
432 
433 	DPRINTF(("uftdi_param: sc=%p\n", sc));
434 
435 	if (sc->sc_dying)
436 		return (EIO);
437 
438 	switch (sc->sc_type) {
439 	case UFTDI_TYPE_SIO:
440 		switch (t->c_ospeed) {
441 		case 300: rate = ftdi_sio_b300; break;
442 		case 600: rate = ftdi_sio_b600; break;
443 		case 1200: rate = ftdi_sio_b1200; break;
444 		case 2400: rate = ftdi_sio_b2400; break;
445 		case 4800: rate = ftdi_sio_b4800; break;
446 		case 9600: rate = ftdi_sio_b9600; break;
447 		case 19200: rate = ftdi_sio_b19200; break;
448 		case 38400: rate = ftdi_sio_b38400; break;
449 		case 57600: rate = ftdi_sio_b57600; break;
450 		case 115200: rate = ftdi_sio_b115200; break;
451 		default:
452 			return (EINVAL);
453 		}
454 		break;
455 
456 	case UFTDI_TYPE_8U232AM:
457 		switch(t->c_ospeed) {
458 		case 300: rate = ftdi_8u232am_b300; break;
459 		case 600: rate = ftdi_8u232am_b600; break;
460 		case 1200: rate = ftdi_8u232am_b1200; break;
461 		case 2400: rate = ftdi_8u232am_b2400; break;
462 		case 4800: rate = ftdi_8u232am_b4800; break;
463 		case 9600: rate = ftdi_8u232am_b9600; break;
464 		case 19200: rate = ftdi_8u232am_b19200; break;
465 		case 38400: rate = ftdi_8u232am_b38400; break;
466 		case 57600: rate = ftdi_8u232am_b57600; break;
467 		case 115200: rate = ftdi_8u232am_b115200; break;
468 		case 230400: rate = ftdi_8u232am_b230400; break;
469 		case 460800: rate = ftdi_8u232am_b460800; break;
470 		case 921600: rate = ftdi_8u232am_b921600; break;
471 		default:
472 			return (EINVAL);
473 		}
474 		break;
475 	}
476 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
477 	req.bRequest = FTDI_SIO_SET_BAUD_RATE;
478 	USETW(req.wValue, rate);
479 	USETW(req.wIndex, portno);
480 	USETW(req.wLength, 0);
481 	DPRINTFN(2,("uftdi_param: reqtype=0x%02x req=0x%02x value=0x%04x "
482 		    "index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
483 		    UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
484 	err = usbd_do_request(sc->sc_udev, &req, NULL);
485 	if (err)
486 		return (EIO);
487 
488 	if (ISSET(t->c_cflag, CSTOPB))
489 		data = FTDI_SIO_SET_DATA_STOP_BITS_2;
490 	else
491 		data = FTDI_SIO_SET_DATA_STOP_BITS_1;
492 	if (ISSET(t->c_cflag, PARENB)) {
493 		if (ISSET(t->c_cflag, PARODD))
494 			data |= FTDI_SIO_SET_DATA_PARITY_ODD;
495 		else
496 			data |= FTDI_SIO_SET_DATA_PARITY_EVEN;
497 	} else
498 		data |= FTDI_SIO_SET_DATA_PARITY_NONE;
499 	switch (ISSET(t->c_cflag, CSIZE)) {
500 	case CS5:
501 		data |= FTDI_SIO_SET_DATA_BITS(5);
502 		break;
503 	case CS6:
504 		data |= FTDI_SIO_SET_DATA_BITS(6);
505 		break;
506 	case CS7:
507 		data |= FTDI_SIO_SET_DATA_BITS(7);
508 		break;
509 	case CS8:
510 		data |= FTDI_SIO_SET_DATA_BITS(8);
511 		break;
512 	}
513 	sc->last_lcr = data;
514 
515 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
516 	req.bRequest = FTDI_SIO_SET_DATA;
517 	USETW(req.wValue, data);
518 	USETW(req.wIndex, portno);
519 	USETW(req.wLength, 0);
520 	DPRINTFN(2,("uftdi_param: reqtype=0x%02x req=0x%02x value=0x%04x "
521 		    "index=0x%04x len=%d\n", req.bmRequestType, req.bRequest,
522 		    UGETW(req.wValue), UGETW(req.wIndex), UGETW(req.wLength)));
523 	err = usbd_do_request(sc->sc_udev, &req, NULL);
524 	if (err)
525 		return (EIO);
526 
527 	if (ISSET(t->c_cflag, CRTSCTS)) {
528 		flow = FTDI_SIO_RTS_CTS_HS;
529 		USETW(req.wValue, 0);
530 	} else if (ISSET(t->c_iflag, IXON|IXOFF)) {
531 		flow = FTDI_SIO_XON_XOFF_HS;
532 		USETW2(req.wValue, t->c_cc[VSTOP], t->c_cc[VSTART]);
533 	} else {
534 		flow = FTDI_SIO_DISABLE_FLOW_CTRL;
535 		USETW(req.wValue, 0);
536 	}
537 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
538 	req.bRequest = FTDI_SIO_SET_FLOW_CTRL;
539 	USETW2(req.wIndex, flow, portno);
540 	USETW(req.wLength, 0);
541 	err = usbd_do_request(sc->sc_udev, &req, NULL);
542 	if (err)
543 		return (EIO);
544 
545 	return (0);
546 }
547 
548 void
549 uftdi_get_status(void *vsc, int portno, u_char *lsr, u_char *msr)
550 {
551 	struct uftdi_softc *sc = vsc;
552 
553 	DPRINTF(("uftdi_status: msr=0x%02x lsr=0x%02x\n",
554 		 sc->sc_msr, sc->sc_lsr));
555 
556 	if (msr != NULL)
557 		*msr = sc->sc_msr;
558 	if (lsr != NULL)
559 		*lsr = sc->sc_lsr;
560 }
561 
562 void
563 uftdi_break(void *vsc, int portno, int onoff)
564 {
565 	struct uftdi_softc *sc = vsc;
566 	usb_device_request_t req;
567 	int data;
568 
569 	DPRINTF(("uftdi_break: sc=%p, port=%d onoff=%d\n", vsc, portno,
570 		  onoff));
571 
572 	if (onoff) {
573 		data = sc->last_lcr | FTDI_SIO_SET_BREAK;
574 	} else {
575 		data = sc->last_lcr;
576 	}
577 
578 	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
579 	req.bRequest = FTDI_SIO_SET_DATA;
580 	USETW(req.wValue, data);
581 	USETW(req.wIndex, portno);
582 	USETW(req.wLength, 0);
583 	(void)usbd_do_request(sc->sc_udev, &req, NULL);
584 }
585