usbdi_util.c revision 1.63.2.12 1 /* $NetBSD: usbdi_util.c,v 1.63.2.12 2015/10/06 21:32:15 skrll Exp $ */
2
3 /*
4 * Copyright (c) 1998, 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Lennart Augustsson (lennart (at) augustsson.net) at
9 * Carlstedt Research & Technology and Matthew R. Green (mrg (at) eterna.com.au).
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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: usbdi_util.c,v 1.63.2.12 2015/10/06 21:32:15 skrll Exp $");
35
36 #ifdef _KERNEL_OPT
37 #include "opt_usb.h"
38 #endif
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/kmem.h>
44 #include <sys/proc.h>
45 #include <sys/device.h>
46 #include <sys/bus.h>
47
48 #include <dev/usb/usb.h>
49 #include <dev/usb/usbhid.h>
50 #include <dev/usb/usbdi.h>
51 #include <dev/usb/usbdivar.h>
52 #include <dev/usb/usbdi_util.h>
53 #include <dev/usb/usbhist.h>
54
55 #define DPRINTFN(N,FMT,A,B,C,D) USBHIST_LOGN(usbdebug,N,FMT,A,B,C,D)
56
57 usbd_status
58 usbd_get_desc(struct usbd_device *dev, int type, int index, int len, void *desc)
59 {
60 usb_device_request_t req;
61
62 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
63
64 DPRINTFN(3,"type=%d, index=%d, len=%d", type, index, len, 0);
65
66 req.bmRequestType = UT_READ_DEVICE;
67 req.bRequest = UR_GET_DESCRIPTOR;
68 USETW2(req.wValue, type, index);
69 USETW(req.wIndex, 0);
70 USETW(req.wLength, len);
71 return usbd_do_request(dev, &req, desc);
72 }
73
74 usbd_status
75 usbd_get_config_desc(struct usbd_device *dev, int confidx,
76 usb_config_descriptor_t *d)
77 {
78 usbd_status err;
79 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
80
81 DPRINTFN(3, "confidx=%d", confidx, 0, 0, 0);
82 err = usbd_get_desc(dev, UDESC_CONFIG, confidx,
83 USB_CONFIG_DESCRIPTOR_SIZE, d);
84 if (err)
85 return err;
86 if (d->bDescriptorType != UDESC_CONFIG) {
87 DPRINTFN(1, "confidx=%d, bad desc len=%d type=%d",
88 confidx, d->bLength, d->bDescriptorType, 0);
89 return USBD_INVAL;
90 }
91 return USBD_NORMAL_COMPLETION;
92 }
93
94 usbd_status
95 usbd_get_config_desc_full(struct usbd_device *dev, int conf, void *d, int size)
96 {
97 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
98
99 DPRINTFN(3, "conf=%d", conf, 0, 0, 0);
100 return usbd_get_desc(dev, UDESC_CONFIG, conf, size, d);
101 }
102
103 usbd_status
104 usbd_get_bos_desc(struct usbd_device *dev, int confidx,
105 usb_bos_descriptor_t *d)
106 {
107 usbd_status err;
108 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
109
110 DPRINTFN(3, "confidx=%d", confidx, 0, 0, 0);
111 err = usbd_get_desc(dev, UDESC_BOS, confidx,
112 USB_BOS_DESCRIPTOR_SIZE, d);
113 if (err)
114 return (err);
115 if (d->bDescriptorType != UDESC_BOS) {
116 DPRINTFN(1, "confidx=%d, bad desc len=%d type=%d",
117 confidx, d->bLength, d->bDescriptorType, 0);
118 return USBD_INVAL;
119 }
120 return USBD_NORMAL_COMPLETION;
121 }
122
123 usbd_status
124 usbd_get_bos_desc_full(struct usbd_device *dev, int conf, void *d, int size)
125 {
126 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
127
128 DPRINTFN(3, "conf=%d", conf, 0, 0, 0);
129 return usbd_get_desc(dev, UDESC_BOS, conf, size, d);
130 }
131
132 usbd_status
133 usbd_get_device_desc(struct usbd_device *dev, usb_device_descriptor_t *d)
134 {
135 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
136
137 return (usbd_get_desc(dev, UDESC_DEVICE,
138 0, USB_DEVICE_DESCRIPTOR_SIZE, d));
139 }
140
141 usbd_status
142 usbd_get_device_status(struct usbd_device *dev, usb_status_t *st)
143 {
144 usb_device_request_t req;
145
146 req.bmRequestType = UT_READ_DEVICE;
147 req.bRequest = UR_GET_STATUS;
148 USETW(req.wValue, 0);
149 USETW(req.wIndex, 0);
150 USETW(req.wLength, sizeof(usb_status_t));
151 return usbd_do_request(dev, &req, st);
152 }
153
154 usbd_status
155 usbd_get_hub_status(struct usbd_device *dev, usb_hub_status_t *st)
156 {
157 usb_device_request_t req;
158
159 req.bmRequestType = UT_READ_CLASS_DEVICE;
160 req.bRequest = UR_GET_STATUS;
161 USETW(req.wValue, 0);
162 USETW(req.wIndex, 0);
163 USETW(req.wLength, sizeof(usb_hub_status_t));
164 return usbd_do_request(dev, &req, st);
165 }
166
167 usbd_status
168 usbd_set_address(struct usbd_device *dev, int addr)
169 {
170 usb_device_request_t req;
171
172 req.bmRequestType = UT_WRITE_DEVICE;
173 req.bRequest = UR_SET_ADDRESS;
174 USETW(req.wValue, addr);
175 USETW(req.wIndex, 0);
176 USETW(req.wLength, 0);
177 return usbd_do_request(dev, &req, 0);
178 }
179
180 usbd_status
181 usbd_get_port_status(struct usbd_device *dev, int port, usb_port_status_t *ps)
182 {
183 usb_device_request_t req;
184
185 req.bmRequestType = UT_READ_CLASS_OTHER;
186 req.bRequest = UR_GET_STATUS;
187 USETW(req.wValue, 0);
188 USETW(req.wIndex, port);
189 USETW(req.wLength, sizeof(*ps));
190 return usbd_do_request(dev, &req, ps);
191 }
192
193 /* USB 3.1 10.16.2.6, 10.16.2.6.3 */
194 usbd_status
195 usbd_get_port_status_ext(struct usbd_device *dev, int port,
196 usb_port_status_ext_t *pse)
197 {
198 usb_device_request_t req;
199
200 req.bmRequestType = UT_READ_CLASS_OTHER;
201 req.bRequest = UR_GET_STATUS;
202 USETW2(req.wValue, 0, UR_PST_EXT_PORT_STATUS);
203 USETW(req.wIndex, port);
204 USETW(req.wLength, sizeof(*pse));
205 return (usbd_do_request(dev, &req, pse));
206 }
207
208 usbd_status
209 usbd_clear_hub_feature(struct usbd_device *dev, int sel)
210 {
211 usb_device_request_t req;
212
213 req.bmRequestType = UT_WRITE_CLASS_DEVICE;
214 req.bRequest = UR_CLEAR_FEATURE;
215 USETW(req.wValue, sel);
216 USETW(req.wIndex, 0);
217 USETW(req.wLength, 0);
218 return usbd_do_request(dev, &req, 0);
219 }
220
221 usbd_status
222 usbd_set_hub_feature(struct usbd_device *dev, int sel)
223 {
224 usb_device_request_t req;
225
226 req.bmRequestType = UT_WRITE_CLASS_DEVICE;
227 req.bRequest = UR_SET_FEATURE;
228 USETW(req.wValue, sel);
229 USETW(req.wIndex, 0);
230 USETW(req.wLength, 0);
231 return usbd_do_request(dev, &req, 0);
232 }
233
234 usbd_status
235 usbd_clear_port_feature(struct usbd_device *dev, int port, int sel)
236 {
237 usb_device_request_t req;
238
239 req.bmRequestType = UT_WRITE_CLASS_OTHER;
240 req.bRequest = UR_CLEAR_FEATURE;
241 USETW(req.wValue, sel);
242 USETW(req.wIndex, port);
243 USETW(req.wLength, 0);
244 return usbd_do_request(dev, &req, 0);
245 }
246
247 usbd_status
248 usbd_set_port_feature(struct usbd_device *dev, int port, int sel)
249 {
250 usb_device_request_t req;
251
252 req.bmRequestType = UT_WRITE_CLASS_OTHER;
253 req.bRequest = UR_SET_FEATURE;
254 USETW(req.wValue, sel);
255 USETW(req.wIndex, port);
256 USETW(req.wLength, 0);
257 return usbd_do_request(dev, &req, 0);
258 }
259
260 usbd_status
261 usbd_set_port_u1_timeout(struct usbd_device *dev, int port, int timeout)
262 {
263 usb_device_request_t req;
264
265 req.bmRequestType = UT_WRITE_CLASS_OTHER;
266 req.bRequest = UR_SET_FEATURE;
267 USETW(req.wValue, UHF_PORT_U1_TIMEOUT);
268 USETW2(req.wIndex, timeout, port);
269 USETW(req.wLength, 0);
270 return usbd_do_request(dev, &req, 0);
271 }
272
273 usbd_status
274 usbd_set_port_u2_timeout(struct usbd_device *dev, int port, int timeout)
275 {
276 usb_device_request_t req;
277
278 req.bmRequestType = UT_WRITE_CLASS_OTHER;
279 req.bRequest = UR_SET_FEATURE;
280 USETW(req.wValue, UHF_PORT_U2_TIMEOUT);
281 USETW2(req.wIndex, timeout, port);
282 USETW(req.wLength, 0);
283 return usbd_do_request(dev, &req, 0);
284 }
285
286 usbd_status
287 usbd_get_protocol(struct usbd_interface *iface, uint8_t *report)
288 {
289 usb_interface_descriptor_t *id = usbd_get_interface_descriptor(iface);
290 struct usbd_device *dev;
291 usb_device_request_t req;
292
293 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
294
295 DPRINTFN(4, "iface=%p, endpt=%d", iface, id->bInterfaceNumber, 0, 0);
296 if (id == NULL)
297 return USBD_IOERROR;
298 usbd_interface2device_handle(iface, &dev);
299 req.bmRequestType = UT_READ_CLASS_INTERFACE;
300 req.bRequest = UR_GET_PROTOCOL;
301 USETW(req.wValue, 0);
302 USETW(req.wIndex, id->bInterfaceNumber);
303 USETW(req.wLength, 1);
304 return usbd_do_request(dev, &req, report);
305 }
306
307 usbd_status
308 usbd_set_protocol(struct usbd_interface *iface, int report)
309 {
310 usb_interface_descriptor_t *id = usbd_get_interface_descriptor(iface);
311 struct usbd_device *dev;
312 usb_device_request_t req;
313
314 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
315
316 DPRINTFN(4, "iface=%p, report=%d, endpt=%d", iface, report,
317 id->bInterfaceNumber, 0);
318 if (id == NULL)
319 return USBD_IOERROR;
320 usbd_interface2device_handle(iface, &dev);
321 req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
322 req.bRequest = UR_SET_PROTOCOL;
323 USETW(req.wValue, report);
324 USETW(req.wIndex, id->bInterfaceNumber);
325 USETW(req.wLength, 0);
326 return usbd_do_request(dev, &req, 0);
327 }
328
329 usbd_status
330 usbd_set_report(struct usbd_interface *iface, int type, int id, void *data,
331 int len)
332 {
333 usb_interface_descriptor_t *ifd = usbd_get_interface_descriptor(iface);
334 struct usbd_device *dev;
335 usb_device_request_t req;
336
337 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
338
339 DPRINTFN(4, "len=%d", len, 0, 0, 0);
340 if (ifd == NULL)
341 return USBD_IOERROR;
342 usbd_interface2device_handle(iface, &dev);
343 req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
344 req.bRequest = UR_SET_REPORT;
345 USETW2(req.wValue, type, id);
346 USETW(req.wIndex, ifd->bInterfaceNumber);
347 USETW(req.wLength, len);
348 return usbd_do_request(dev, &req, data);
349 }
350
351 usbd_status
352 usbd_get_report(struct usbd_interface *iface, int type, int id, void *data,
353 int len)
354 {
355 usb_interface_descriptor_t *ifd = usbd_get_interface_descriptor(iface);
356 struct usbd_device *dev;
357 usb_device_request_t req;
358
359 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
360
361 DPRINTFN(4, "len=%d", len, 0, 0, 0);
362 if (ifd == NULL)
363 return USBD_IOERROR;
364 usbd_interface2device_handle(iface, &dev);
365 req.bmRequestType = UT_READ_CLASS_INTERFACE;
366 req.bRequest = UR_GET_REPORT;
367 USETW2(req.wValue, type, id);
368 USETW(req.wIndex, ifd->bInterfaceNumber);
369 USETW(req.wLength, len);
370 return usbd_do_request(dev, &req, data);
371 }
372
373 usbd_status
374 usbd_set_idle(struct usbd_interface *iface, int duration, int id)
375 {
376 usb_interface_descriptor_t *ifd = usbd_get_interface_descriptor(iface);
377 struct usbd_device *dev;
378 usb_device_request_t req;
379
380 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
381
382 DPRINTFN(4, "duration %d id %d", duration, id, 0, 0);
383 if (ifd == NULL)
384 return USBD_IOERROR;
385 usbd_interface2device_handle(iface, &dev);
386 req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
387 req.bRequest = UR_SET_IDLE;
388 USETW2(req.wValue, duration, id);
389 USETW(req.wIndex, ifd->bInterfaceNumber);
390 USETW(req.wLength, 0);
391 return usbd_do_request(dev, &req, 0);
392 }
393
394 usbd_status
395 usbd_get_report_descriptor(struct usbd_device *dev, int ifcno,
396 int size, void *d)
397 {
398 usb_device_request_t req;
399
400 req.bmRequestType = UT_READ_INTERFACE;
401 req.bRequest = UR_GET_DESCRIPTOR;
402 USETW2(req.wValue, UDESC_REPORT, 0); /* report id should be 0 */
403 USETW(req.wIndex, ifcno);
404 USETW(req.wLength, size);
405 return usbd_do_request(dev, &req, d);
406 }
407
408 usb_hid_descriptor_t *
409 usbd_get_hid_descriptor(struct usbd_interface *ifc)
410 {
411 usb_interface_descriptor_t *idesc = usbd_get_interface_descriptor(ifc);
412 struct usbd_device *dev;
413 usb_config_descriptor_t *cdesc;
414 usb_hid_descriptor_t *hd;
415 char *p, *end;
416
417 if (idesc == NULL)
418 return NULL;
419 usbd_interface2device_handle(ifc, &dev);
420 cdesc = usbd_get_config_descriptor(dev);
421
422 p = (char *)idesc + idesc->bLength;
423 end = (char *)cdesc + UGETW(cdesc->wTotalLength);
424
425 for (; p < end; p += hd->bLength) {
426 hd = (usb_hid_descriptor_t *)p;
427 if (p + hd->bLength <= end && hd->bDescriptorType == UDESC_HID)
428 return hd;
429 if (hd->bDescriptorType == UDESC_INTERFACE)
430 break;
431 }
432 return NULL;
433 }
434
435 usbd_status
436 usbd_read_report_desc(struct usbd_interface *ifc, void **descp, int *sizep)
437 {
438 usb_interface_descriptor_t *id;
439 usb_hid_descriptor_t *hid;
440 struct usbd_device *dev;
441 usbd_status err;
442
443 usbd_interface2device_handle(ifc, &dev);
444 id = usbd_get_interface_descriptor(ifc);
445 if (id == NULL)
446 return USBD_INVAL;
447 hid = usbd_get_hid_descriptor(ifc);
448 if (hid == NULL)
449 return USBD_IOERROR;
450 *sizep = UGETW(hid->descrs[0].wDescriptorLength);
451 *descp = kmem_alloc(*sizep, KM_SLEEP);
452 if (*descp == NULL)
453 return USBD_NOMEM;
454 err = usbd_get_report_descriptor(dev, id->bInterfaceNumber,
455 *sizep, *descp);
456 if (err) {
457 kmem_free(*descp, *sizep);
458 *descp = NULL;
459 return err;
460 }
461 return USBD_NORMAL_COMPLETION;
462 }
463
464 usbd_status
465 usbd_get_config(struct usbd_device *dev, uint8_t *conf)
466 {
467 usb_device_request_t req;
468
469 req.bmRequestType = UT_READ_DEVICE;
470 req.bRequest = UR_GET_CONFIG;
471 USETW(req.wValue, 0);
472 USETW(req.wIndex, 0);
473 USETW(req.wLength, 1);
474 return usbd_do_request(dev, &req, conf);
475 }
476
477 usbd_status
478 usbd_bulk_transfer(struct usbd_xfer *xfer, struct usbd_pipe *pipe,
479 uint16_t flags, uint32_t timeout, void *buf, uint32_t *size)
480 {
481 usbd_status err;
482
483 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
484
485 usbd_setup_xfer(xfer, 0, buf, *size, flags, timeout, NULL);
486 DPRINTFN(1, "start transfer %d bytes", *size, 0, 0, 0);
487 err = usbd_sync_transfer_sig(xfer);
488
489 usbd_get_xfer_status(xfer, NULL, NULL, size, NULL);
490 DPRINTFN(1, "transferred %d", *size, 0, 0, 0);
491 if (err) {
492 usbd_clear_endpoint_stall(pipe);
493 }
494 USBHIST_LOG(usbdebug, "<- done xfer %p err %d", xfer, err, 0, 0);
495
496 return err;
497 }
498
499 usbd_status
500 usbd_intr_transfer(struct usbd_xfer *xfer, struct usbd_pipe *pipe,
501 uint16_t flags, uint32_t timeout, void *buf, uint32_t *size)
502 {
503 usbd_status err;
504
505 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
506
507 usbd_setup_xfer(xfer, 0, buf, *size, flags, timeout, NULL);
508
509 DPRINTFN(1, "start transfer %d bytes", *size, 0, 0, 0);
510 err = usbd_sync_transfer_sig(xfer);
511
512 usbd_get_xfer_status(xfer, NULL, NULL, size, NULL);
513
514 DPRINTFN(1, "transferred %d", *size, 0, 0, 0);
515 if (err) {
516 usbd_clear_endpoint_stall(pipe);
517 }
518 USBHIST_LOG(usbdebug, "<- done xfer %p err %d", xfer, err, 0, 0);
519
520 return err;
521 }
522
523 void
524 usb_detach_wait(device_t dv, kcondvar_t *cv, kmutex_t *lock)
525 {
526 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
527
528 DPRINTFN(1, "waiting for dv %p", dv, 0, 0, 0);
529 if (cv_timedwait(cv, lock, hz * 60)) // dv, PZERO, "usbdet", hz * 60
530 printf("usb_detach_wait: %s didn't detach\n",
531 device_xname(dv));
532 DPRINTFN(1, "done", 0, 0, 0, 0);
533 }
534
535 void
536 usb_detach_broadcast(device_t dv, kcondvar_t *cv)
537 {
538 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
539
540 DPRINTFN(1, "for dv %p", dv, 0, 0, 0);
541 cv_broadcast(cv);
542 }
543
544 void
545 usb_detach_waitold(device_t dv)
546 {
547 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
548
549 DPRINTFN(1, "waiting for dv %p", dv, 0, 0, 0);
550 if (tsleep(dv, PZERO, "usbdet", hz * 60)) /* XXXSMP ok */
551 printf("usb_detach_waitold: %s didn't detach\n",
552 device_xname(dv));
553 DPRINTFN(1, "done", 0, 0, 0, 0);
554 }
555
556 void
557 usb_detach_wakeupold(device_t dv)
558 {
559 USBHIST_FUNC(); USBHIST_CALLED(usbdebug);
560
561 DPRINTFN(1, "for dv %p", dv, 0, 0, 0);
562 wakeup(dv); /* XXXSMP ok */
563 }
564
565 const usb_cdc_descriptor_t *
566 usb_find_desc(struct usbd_device *dev, int type, int subtype)
567 {
568 usbd_desc_iter_t iter;
569 const usb_cdc_descriptor_t *desc;
570
571 usb_desc_iter_init(dev, &iter);
572 for (;;) {
573 desc = (const usb_cdc_descriptor_t *)usb_desc_iter_next(&iter);
574 if (!desc || (desc->bDescriptorType == type &&
575 (subtype == USBD_CDCSUBTYPE_ANY ||
576 subtype == desc->bDescriptorSubtype)))
577 break;
578 }
579 return desc;
580 }
581
582 /* same as usb_find_desc(), but searches only in the specified interface. */
583 const usb_cdc_descriptor_t *
584 usb_find_desc_if(struct usbd_device *dev, int type, int subtype,
585 usb_interface_descriptor_t *id)
586 {
587 usbd_desc_iter_t iter;
588 const usb_cdc_descriptor_t *desc;
589
590 if (id == NULL)
591 return usb_find_desc(dev, type, subtype);
592
593 usb_desc_iter_init(dev, &iter);
594
595 iter.cur = (void *)id; /* start from the interface desc */
596 usb_desc_iter_next(&iter); /* and skip it */
597
598 while ((desc = (const usb_cdc_descriptor_t *)usb_desc_iter_next(&iter))
599 != NULL) {
600 if (desc->bDescriptorType == UDESC_INTERFACE) {
601 /* we ran into the next interface --- not found */
602 return NULL;
603 }
604 if (desc->bDescriptorType == type &&
605 (subtype == USBD_CDCSUBTYPE_ANY ||
606 subtype == desc->bDescriptorSubtype))
607 break;
608 }
609 return desc;
610 }
611