Bug Summary

File:hw/usb/desc.c
Location:line 573, column 5
Description:Value stored to 'dst' is never read

Annotated Source Code

1#include <ctype.h>
2
3#include "hw/usb.h"
4#include "hw/usb/desc.h"
5#include "trace.h"
6
7/* ------------------------------------------------------------------ */
8
9int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
10 uint8_t *dest, size_t len)
11{
12 uint8_t bLength = 0x12;
13 USBDescriptor *d = (void *)dest;
14
15 if (len < bLength) {
16 return -1;
17 }
18
19 d->bLength = bLength;
20 d->bDescriptorType = USB_DT_DEVICE0x01;
21
22 d->u.device.bcdUSB_lo = usb_lo(dev->bcdUSB);
23 d->u.device.bcdUSB_hi = usb_hi(dev->bcdUSB);
24 d->u.device.bDeviceClass = dev->bDeviceClass;
25 d->u.device.bDeviceSubClass = dev->bDeviceSubClass;
26 d->u.device.bDeviceProtocol = dev->bDeviceProtocol;
27 d->u.device.bMaxPacketSize0 = dev->bMaxPacketSize0;
28
29 d->u.device.idVendor_lo = usb_lo(id->idVendor);
30 d->u.device.idVendor_hi = usb_hi(id->idVendor);
31 d->u.device.idProduct_lo = usb_lo(id->idProduct);
32 d->u.device.idProduct_hi = usb_hi(id->idProduct);
33 d->u.device.bcdDevice_lo = usb_lo(id->bcdDevice);
34 d->u.device.bcdDevice_hi = usb_hi(id->bcdDevice);
35 d->u.device.iManufacturer = id->iManufacturer;
36 d->u.device.iProduct = id->iProduct;
37 d->u.device.iSerialNumber = id->iSerialNumber;
38
39 d->u.device.bNumConfigurations = dev->bNumConfigurations;
40
41 return bLength;
42}
43
44int usb_desc_device_qualifier(const USBDescDevice *dev,
45 uint8_t *dest, size_t len)
46{
47 uint8_t bLength = 0x0a;
48 USBDescriptor *d = (void *)dest;
49
50 if (len < bLength) {
51 return -1;
52 }
53
54 d->bLength = bLength;
55 d->bDescriptorType = USB_DT_DEVICE_QUALIFIER0x06;
56
57 d->u.device_qualifier.bcdUSB_lo = usb_lo(dev->bcdUSB);
58 d->u.device_qualifier.bcdUSB_hi = usb_hi(dev->bcdUSB);
59 d->u.device_qualifier.bDeviceClass = dev->bDeviceClass;
60 d->u.device_qualifier.bDeviceSubClass = dev->bDeviceSubClass;
61 d->u.device_qualifier.bDeviceProtocol = dev->bDeviceProtocol;
62 d->u.device_qualifier.bMaxPacketSize0 = dev->bMaxPacketSize0;
63 d->u.device_qualifier.bNumConfigurations = dev->bNumConfigurations;
64 d->u.device_qualifier.bReserved = 0;
65
66 return bLength;
67}
68
69int usb_desc_config(const USBDescConfig *conf, int flags,
70 uint8_t *dest, size_t len)
71{
72 uint8_t bLength = 0x09;
73 uint16_t wTotalLength = 0;
74 USBDescriptor *d = (void *)dest;
75 int i, rc;
76
77 if (len < bLength) {
78 return -1;
79 }
80
81 d->bLength = bLength;
82 d->bDescriptorType = USB_DT_CONFIG0x02;
83
84 d->u.config.bNumInterfaces = conf->bNumInterfaces;
85 d->u.config.bConfigurationValue = conf->bConfigurationValue;
86 d->u.config.iConfiguration = conf->iConfiguration;
87 d->u.config.bmAttributes = conf->bmAttributes;
88 d->u.config.bMaxPower = conf->bMaxPower;
89 wTotalLength += bLength;
90
91 /* handle grouped interfaces if any */
92 for (i = 0; i < conf->nif_groups; i++) {
93 rc = usb_desc_iface_group(&(conf->if_groups[i]), flags,
94 dest + wTotalLength,
95 len - wTotalLength);
96 if (rc < 0) {
97 return rc;
98 }
99 wTotalLength += rc;
100 }
101
102 /* handle normal (ungrouped / no IAD) interfaces if any */
103 for (i = 0; i < conf->nif; i++) {
104 rc = usb_desc_iface(conf->ifs + i, flags,
105 dest + wTotalLength, len - wTotalLength);
106 if (rc < 0) {
107 return rc;
108 }
109 wTotalLength += rc;
110 }
111
112 d->u.config.wTotalLength_lo = usb_lo(wTotalLength);
113 d->u.config.wTotalLength_hi = usb_hi(wTotalLength);
114 return wTotalLength;
115}
116
117int usb_desc_iface_group(const USBDescIfaceAssoc *iad, int flags,
118 uint8_t *dest, size_t len)
119{
120 int pos = 0;
121 int i = 0;
122
123 /* handle interface association descriptor */
124 uint8_t bLength = 0x08;
125
126 if (len < bLength) {
127 return -1;
128 }
129
130 dest[0x00] = bLength;
131 dest[0x01] = USB_DT_INTERFACE_ASSOC0x0B;
132 dest[0x02] = iad->bFirstInterface;
133 dest[0x03] = iad->bInterfaceCount;
134 dest[0x04] = iad->bFunctionClass;
135 dest[0x05] = iad->bFunctionSubClass;
136 dest[0x06] = iad->bFunctionProtocol;
137 dest[0x07] = iad->iFunction;
138 pos += bLength;
139
140 /* handle associated interfaces in this group */
141 for (i = 0; i < iad->nif; i++) {
142 int rc = usb_desc_iface(&(iad->ifs[i]), flags, dest + pos, len - pos);
143 if (rc < 0) {
144 return rc;
145 }
146 pos += rc;
147 }
148
149 return pos;
150}
151
152int usb_desc_iface(const USBDescIface *iface, int flags,
153 uint8_t *dest, size_t len)
154{
155 uint8_t bLength = 0x09;
156 int i, rc, pos = 0;
157 USBDescriptor *d = (void *)dest;
158
159 if (len < bLength) {
160 return -1;
161 }
162
163 d->bLength = bLength;
164 d->bDescriptorType = USB_DT_INTERFACE0x04;
165
166 d->u.interface.bInterfaceNumber = iface->bInterfaceNumber;
167 d->u.interface.bAlternateSetting = iface->bAlternateSetting;
168 d->u.interface.bNumEndpoints = iface->bNumEndpoints;
169 d->u.interface.bInterfaceClass = iface->bInterfaceClass;
170 d->u.interface.bInterfaceSubClass = iface->bInterfaceSubClass;
171 d->u.interface.bInterfaceProtocol = iface->bInterfaceProtocol;
172 d->u.interface.iInterface = iface->iInterface;
173 pos += bLength;
174
175 for (i = 0; i < iface->ndesc; i++) {
176 rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
177 if (rc < 0) {
178 return rc;
179 }
180 pos += rc;
181 }
182
183 for (i = 0; i < iface->bNumEndpoints; i++) {
184 rc = usb_desc_endpoint(iface->eps + i, flags, dest + pos, len - pos);
185 if (rc < 0) {
186 return rc;
187 }
188 pos += rc;
189 }
190
191 return pos;
192}
193
194int usb_desc_endpoint(const USBDescEndpoint *ep, int flags,
195 uint8_t *dest, size_t len)
196{
197 uint8_t bLength = ep->is_audio ? 0x09 : 0x07;
198 uint8_t extralen = ep->extra ? ep->extra[0] : 0;
199 uint8_t superlen = (flags & USB_DESC_FLAG_SUPER(1 << 1)) ? 0x06 : 0;
200 USBDescriptor *d = (void *)dest;
201
202 if (len < bLength + extralen + superlen) {
203 return -1;
204 }
205
206 d->bLength = bLength;
207 d->bDescriptorType = USB_DT_ENDPOINT0x05;
208
209 d->u.endpoint.bEndpointAddress = ep->bEndpointAddress;
210 d->u.endpoint.bmAttributes = ep->bmAttributes;
211 d->u.endpoint.wMaxPacketSize_lo = usb_lo(ep->wMaxPacketSize);
212 d->u.endpoint.wMaxPacketSize_hi = usb_hi(ep->wMaxPacketSize);
213 d->u.endpoint.bInterval = ep->bInterval;
214 if (ep->is_audio) {
215 d->u.endpoint.bRefresh = ep->bRefresh;
216 d->u.endpoint.bSynchAddress = ep->bSynchAddress;
217 }
218
219 if (superlen) {
220 USBDescriptor *d = (void *)(dest + bLength);
221
222 d->bLength = 0x06;
223 d->bDescriptorType = USB_DT_ENDPOINT_COMPANION0x30;
224
225 d->u.super_endpoint.bMaxBurst = ep->bMaxBurst;
226 d->u.super_endpoint.bmAttributes = ep->bmAttributes_super;
227 d->u.super_endpoint.wBytesPerInterval_lo =
228 usb_lo(ep->wBytesPerInterval);
229 d->u.super_endpoint.wBytesPerInterval_hi =
230 usb_hi(ep->wBytesPerInterval);
231 }
232
233 if (ep->extra) {
234 memcpy(dest + bLength + superlen, ep->extra, extralen);
235 }
236
237 return bLength + extralen + superlen;
238}
239
240int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)
241{
242 int bLength = desc->length ? desc->length : desc->data[0];
243
244 if (len < bLength) {
245 return -1;
246 }
247
248 memcpy(dest, desc->data, bLength);
249 return bLength;
250}
251
252static int usb_desc_cap_usb2_ext(const USBDesc *desc, uint8_t *dest, size_t len)
253{
254 uint8_t bLength = 0x07;
255 USBDescriptor *d = (void *)dest;
256
257 if (len < bLength) {
258 return -1;
259 }
260
261 d->bLength = bLength;
262 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY0x10;
263 d->u.cap.bDevCapabilityType = USB_DEV_CAP_USB2_EXT0x02;
264
265 d->u.cap.u.usb2_ext.bmAttributes_1 = (1 << 1); /* LPM */
266 d->u.cap.u.usb2_ext.bmAttributes_2 = 0;
267 d->u.cap.u.usb2_ext.bmAttributes_3 = 0;
268 d->u.cap.u.usb2_ext.bmAttributes_4 = 0;
269
270 return bLength;
271}
272
273static int usb_desc_cap_super(const USBDesc *desc, uint8_t *dest, size_t len)
274{
275 uint8_t bLength = 0x0a;
276 USBDescriptor *d = (void *)dest;
277
278 if (len < bLength) {
279 return -1;
280 }
281
282 d->bLength = bLength;
283 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY0x10;
284 d->u.cap.bDevCapabilityType = USB_DEV_CAP_SUPERSPEED0x03;
285
286 d->u.cap.u.super.bmAttributes = 0;
287 d->u.cap.u.super.wSpeedsSupported_lo = 0;
288 d->u.cap.u.super.wSpeedsSupported_hi = 0;
289 d->u.cap.u.super.bFunctionalitySupport = 0;
290 d->u.cap.u.super.bU1DevExitLat = 0x0a;
291 d->u.cap.u.super.wU2DevExitLat_lo = 0x20;
292 d->u.cap.u.super.wU2DevExitLat_hi = 0;
293
294 if (desc->full) {
295 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 1);
296 d->u.cap.u.super.bFunctionalitySupport = 1;
297 }
298 if (desc->high) {
299 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 2);
300 if (!d->u.cap.u.super.bFunctionalitySupport) {
301 d->u.cap.u.super.bFunctionalitySupport = 2;
302 }
303 }
304 if (desc->super) {
305 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 3);
306 if (!d->u.cap.u.super.bFunctionalitySupport) {
307 d->u.cap.u.super.bFunctionalitySupport = 3;
308 }
309 }
310
311 return bLength;
312}
313
314static int usb_desc_bos(const USBDesc *desc, uint8_t *dest, size_t len)
315{
316 uint8_t bLength = 0x05;
317 uint16_t wTotalLength = 0;
318 uint8_t bNumDeviceCaps = 0;
319 USBDescriptor *d = (void *)dest;
320 int rc;
321
322 if (len < bLength) {
323 return -1;
324 }
325
326 d->bLength = bLength;
327 d->bDescriptorType = USB_DT_BOS0x0F;
328
329 wTotalLength += bLength;
330
331 if (desc->high != NULL((void*)0)) {
332 rc = usb_desc_cap_usb2_ext(desc, dest + wTotalLength,
333 len - wTotalLength);
334 if (rc < 0) {
335 return rc;
336 }
337 wTotalLength += rc;
338 bNumDeviceCaps++;
339 }
340
341 if (desc->super != NULL((void*)0)) {
342 rc = usb_desc_cap_super(desc, dest + wTotalLength,
343 len - wTotalLength);
344 if (rc < 0) {
345 return rc;
346 }
347 wTotalLength += rc;
348 bNumDeviceCaps++;
349 }
350
351 d->u.bos.wTotalLength_lo = usb_lo(wTotalLength);
352 d->u.bos.wTotalLength_hi = usb_hi(wTotalLength);
353 d->u.bos.bNumDeviceCaps = bNumDeviceCaps;
354 return wTotalLength;
355}
356
357/* ------------------------------------------------------------------ */
358
359static void usb_desc_ep_init(USBDevice *dev)
360{
361 const USBDescIface *iface;
362 int i, e, pid, ep;
363
364 usb_ep_init(dev);
365 for (i = 0; i < dev->ninterfaces; i++) {
366 iface = dev->ifaces[i];
367 if (iface == NULL((void*)0)) {
368 continue;
369 }
370 for (e = 0; e < iface->bNumEndpoints; e++) {
371 pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN0x80) ?
372 USB_TOKEN_IN0x69 : USB_TOKEN_OUT0xe1;
373 ep = iface->eps[e].bEndpointAddress & 0x0f;
374 usb_ep_set_type(dev, pid, ep, iface->eps[e].bmAttributes & 0x03);
375 usb_ep_set_ifnum(dev, pid, ep, iface->bInterfaceNumber);
376 usb_ep_set_max_packet_size(dev, pid, ep,
377 iface->eps[e].wMaxPacketSize);
378 usb_ep_set_max_streams(dev, pid, ep,
379 iface->eps[e].bmAttributes_super);
380 }
381 }
382}
383
384static const USBDescIface *usb_desc_find_interface(USBDevice *dev,
385 int nif, int alt)
386{
387 const USBDescIface *iface;
388 int g, i;
389
390 if (!dev->config) {
391 return NULL((void*)0);
392 }
393 for (g = 0; g < dev->config->nif_groups; g++) {
394 for (i = 0; i < dev->config->if_groups[g].nif; i++) {
395 iface = &dev->config->if_groups[g].ifs[i];
396 if (iface->bInterfaceNumber == nif &&
397 iface->bAlternateSetting == alt) {
398 return iface;
399 }
400 }
401 }
402 for (i = 0; i < dev->config->nif; i++) {
403 iface = &dev->config->ifs[i];
404 if (iface->bInterfaceNumber == nif &&
405 iface->bAlternateSetting == alt) {
406 return iface;
407 }
408 }
409 return NULL((void*)0);
410}
411
412static int usb_desc_set_interface(USBDevice *dev, int index, int value)
413{
414 const USBDescIface *iface;
415 int old;
416
417 iface = usb_desc_find_interface(dev, index, value);
418 if (iface == NULL((void*)0)) {
419 return -1;
420 }
421
422 old = dev->altsetting[index];
423 dev->altsetting[index] = value;
424 dev->ifaces[index] = iface;
425 usb_desc_ep_init(dev);
426
427 if (old != value) {
428 usb_device_set_interface(dev, index, old, value);
429 }
430 return 0;
431}
432
433static int usb_desc_set_config(USBDevice *dev, int value)
434{
435 int i;
436
437 if (value == 0) {
438 dev->configuration = 0;
439 dev->ninterfaces = 0;
440 dev->config = NULL((void*)0);
441 } else {
442 for (i = 0; i < dev->device->bNumConfigurations; i++) {
443 if (dev->device->confs[i].bConfigurationValue == value) {
444 dev->configuration = value;
445 dev->ninterfaces = dev->device->confs[i].bNumInterfaces;
446 dev->config = dev->device->confs + i;
447 assert(dev->ninterfaces <= USB_MAX_INTERFACES)((dev->ninterfaces <= 16) ? (void) (0) : __assert_fail (
"dev->ninterfaces <= 16", "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c"
, 447, __PRETTY_FUNCTION__));
448 }
449 }
450 if (i < dev->device->bNumConfigurations) {
451 return -1;
452 }
453 }
454
455 for (i = 0; i < dev->ninterfaces; i++) {
456 usb_desc_set_interface(dev, i, 0);
457 }
458 for (; i < USB_MAX_INTERFACES16; i++) {
459 dev->altsetting[i] = 0;
460 dev->ifaces[i] = NULL((void*)0);
461 }
462
463 return 0;
464}
465
466static void usb_desc_setdefaults(USBDevice *dev)
467{
468 const USBDesc *desc = usb_device_get_usb_desc(dev);
469
470 assert(desc != NULL)((desc != ((void*)0)) ? (void) (0) : __assert_fail ("desc != ((void*)0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c", 470, __PRETTY_FUNCTION__
));
471 switch (dev->speed) {
472 case USB_SPEED_LOW0:
473 case USB_SPEED_FULL1:
474 dev->device = desc->full;
475 break;
476 case USB_SPEED_HIGH2:
477 dev->device = desc->high;
478 break;
479 case USB_SPEED_SUPER3:
480 dev->device = desc->super;
481 break;
482 }
483 usb_desc_set_config(dev, 0);
484}
485
486void usb_desc_init(USBDevice *dev)
487{
488 const USBDesc *desc = usb_device_get_usb_desc(dev);
489
490 assert(desc != NULL)((desc != ((void*)0)) ? (void) (0) : __assert_fail ("desc != ((void*)0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c", 490, __PRETTY_FUNCTION__
));
491 dev->speed = USB_SPEED_FULL1;
492 dev->speedmask = 0;
493 if (desc->full) {
494 dev->speedmask |= USB_SPEED_MASK_FULL(1 << 1);
495 }
496 if (desc->high) {
497 dev->speedmask |= USB_SPEED_MASK_HIGH(1 << 2);
498 }
499 if (desc->super) {
500 dev->speedmask |= USB_SPEED_MASK_SUPER(1 << 3);
501 }
502 usb_desc_setdefaults(dev);
503}
504
505void usb_desc_attach(USBDevice *dev)
506{
507 const USBDesc *desc = usb_device_get_usb_desc(dev);
508
509 assert(desc != NULL)((desc != ((void*)0)) ? (void) (0) : __assert_fail ("desc != ((void*)0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c", 509, __PRETTY_FUNCTION__
));
510 if (desc->super && (dev->port->speedmask & USB_SPEED_MASK_SUPER(1 << 3))) {
511 dev->speed = USB_SPEED_SUPER3;
512 } else if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH(1 << 2))) {
513 dev->speed = USB_SPEED_HIGH2;
514 } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL(1 << 1))) {
515 dev->speed = USB_SPEED_FULL1;
516 } else {
517 return;
518 }
519 usb_desc_setdefaults(dev);
520}
521
522void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str)
523{
524 USBDescString *s;
525
526 QLIST_FOREACH(s, &dev->strings, next)for ((s) = ((&dev->strings)->lh_first); (s); (s) = (
(s)->next.le_next)) {
527 if (s->index == index) {
528 break;
529 }
530 }
531 if (s == NULL((void*)0)) {
532 s = g_malloc0(sizeof(*s));
533 s->index = index;
534 QLIST_INSERT_HEAD(&dev->strings, s, next)do { if (((s)->next.le_next = (&dev->strings)->lh_first
) != ((void*)0)) (&dev->strings)->lh_first->next
.le_prev = &(s)->next.le_next; (&dev->strings)->
lh_first = (s); (s)->next.le_prev = &(&dev->strings
)->lh_first; } while ( 0);
535 }
536 g_free(s->str);
537 s->str = g_strdup(str);
538}
539
540/*
541 * This function creates a serial number for a usb device.
542 * The serial number should:
543 * (a) Be unique within the virtual machine.
544 * (b) Be constant, so you don't get a new one each
545 * time the guest is started.
546 * So we are using the physical location to generate a serial number
547 * from it. It has three pieces: First a fixed, device-specific
548 * prefix. Second the device path of the host controller (which is
549 * the pci address in most cases). Third the physical port path.
550 * Results in serial numbers like this: "314159-0000:00:1d.7-3".
551 */
552void usb_desc_create_serial(USBDevice *dev)
553{
554 DeviceState *hcd = dev->qdev.parent_bus->parent;
555 const USBDesc *desc = usb_device_get_usb_desc(dev);
556 int index = desc->id.iSerialNumber;
557 char serial[64];
558 char *path;
559 int dst;
560
561 if (dev->serial) {
562 /* 'serial' usb bus property has priority if present */
563 usb_desc_set_string(dev, index, dev->serial);
564 return;
565 }
566
567 assert(index != 0 && desc->str[index] != NULL)((index != 0 && desc->str[index] != ((void*)0)) ? (
void) (0) : __assert_fail ("index != 0 && desc->str[index] != ((void*)0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c", 567, __PRETTY_FUNCTION__
));
568 dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]);
569 path = qdev_get_dev_path(hcd);
570 if (path) {
571 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", path);
572 }
573 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", dev->port->path);
Value stored to 'dst' is never read
574 usb_desc_set_string(dev, index, serial);
575}
576
577const char *usb_desc_get_string(USBDevice *dev, uint8_t index)
578{
579 USBDescString *s;
580
581 QLIST_FOREACH(s, &dev->strings, next)for ((s) = ((&dev->strings)->lh_first); (s); (s) = (
(s)->next.le_next)) {
582 if (s->index == index) {
583 return s->str;
584 }
585 }
586 return NULL((void*)0);
587}
588
589int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)
590{
591 uint8_t bLength, pos, i;
592 const char *str;
593
594 if (len < 4) {
595 return -1;
596 }
597
598 if (index == 0) {
599 /* language ids */
600 dest[0] = 4;
601 dest[1] = USB_DT_STRING0x03;
602 dest[2] = 0x09;
603 dest[3] = 0x04;
604 return 4;
605 }
606
607 str = usb_desc_get_string(dev, index);
608 if (str == NULL((void*)0)) {
609 str = usb_device_get_usb_desc(dev)->str[index];
610 if (str == NULL((void*)0)) {
611 return 0;
612 }
613 }
614
615 bLength = strlen(str) * 2 + 2;
616 dest[0] = bLength;
617 dest[1] = USB_DT_STRING0x03;
618 i = 0; pos = 2;
619 while (pos+1 < bLength && pos+1 < len) {
620 dest[pos++] = str[i++];
621 dest[pos++] = 0;
622 }
623 return pos;
624}
625
626int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p,
627 int value, uint8_t *dest, size_t len)
628{
629 const USBDesc *desc = usb_device_get_usb_desc(dev);
630 const USBDescDevice *other_dev;
631 uint8_t buf[256];
632 uint8_t type = value >> 8;
633 uint8_t index = value & 0xff;
634 int flags, ret = -1;
635
636 if (dev->speed == USB_SPEED_HIGH2) {
637 other_dev = usb_device_get_usb_desc(dev)->full;
638 } else {
639 other_dev = usb_device_get_usb_desc(dev)->high;
640 }
641
642 flags = 0;
643 if (dev->device->bcdUSB >= 0x0300) {
644 flags |= USB_DESC_FLAG_SUPER(1 << 1);
645 }
646
647 switch(type) {
648 case USB_DT_DEVICE0x01:
649 ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
650 trace_usb_desc_device(dev->addr, len, ret);
651 break;
652 case USB_DT_CONFIG0x02:
653 if (index < dev->device->bNumConfigurations) {
654 ret = usb_desc_config(dev->device->confs + index, flags,
655 buf, sizeof(buf));
656 }
657 trace_usb_desc_config(dev->addr, index, len, ret);
658 break;
659 case USB_DT_STRING0x03:
660 ret = usb_desc_string(dev, index, buf, sizeof(buf));
661 trace_usb_desc_string(dev->addr, index, len, ret);
662 break;
663 case USB_DT_DEVICE_QUALIFIER0x06:
664 if (other_dev != NULL((void*)0)) {
665 ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
666 }
667 trace_usb_desc_device_qualifier(dev->addr, len, ret);
668 break;
669 case USB_DT_OTHER_SPEED_CONFIG0x07:
670 if (other_dev != NULL((void*)0) && index < other_dev->bNumConfigurations) {
671 ret = usb_desc_config(other_dev->confs + index, flags,
672 buf, sizeof(buf));
673 buf[0x01] = USB_DT_OTHER_SPEED_CONFIG0x07;
674 }
675 trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
676 break;
677 case USB_DT_BOS0x0F:
678 ret = usb_desc_bos(desc, buf, sizeof(buf));
679 trace_usb_desc_bos(dev->addr, len, ret);
680 break;
681
682 case USB_DT_DEBUG0x0A:
683 /* ignore silently */
684 break;
685
686 default:
687 fprintf(stderrstderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
688 dev->addr, type, len);
689 break;
690 }
691
692 if (ret > 0) {
693 if (ret > len) {
694 ret = len;
695 }
696 memcpy(dest, buf, ret);
697 p->actual_length = ret;
698 ret = 0;
699 }
700 return ret;
701}
702
703int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
704 int request, int value, int index, int length, uint8_t *data)
705{
706 const USBDesc *desc = usb_device_get_usb_desc(dev);
707 int ret = -1;
708
709 assert(desc != NULL)((desc != ((void*)0)) ? (void) (0) : __assert_fail ("desc != ((void*)0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/usb/desc.c", 709, __PRETTY_FUNCTION__
));
710 switch(request) {
711 case DeviceOutRequest((0|(0x00 << 5)|0x00)<<8) | USB_REQ_SET_ADDRESS0x05:
712 dev->addr = value;
713 trace_usb_set_addr(dev->addr);
714 ret = 0;
715 break;
716
717 case DeviceRequest((0x80|(0x00 << 5)|0x00)<<8) | USB_REQ_GET_DESCRIPTOR0x06:
718 ret = usb_desc_get_descriptor(dev, p, value, data, length);
719 break;
720
721 case DeviceRequest((0x80|(0x00 << 5)|0x00)<<8) | USB_REQ_GET_CONFIGURATION0x08:
722 /*
723 * 9.4.2: 0 should be returned if the device is unconfigured, otherwise
724 * the non zero value of bConfigurationValue.
725 */
726 data[0] = dev->config ? dev->config->bConfigurationValue : 0;
727 p->actual_length = 1;
728 ret = 0;
729 break;
730 case DeviceOutRequest((0|(0x00 << 5)|0x00)<<8) | USB_REQ_SET_CONFIGURATION0x09:
731 ret = usb_desc_set_config(dev, value);
732 trace_usb_set_config(dev->addr, value, ret);
733 break;
734
735 case DeviceRequest((0x80|(0x00 << 5)|0x00)<<8) | USB_REQ_GET_STATUS0x00: {
736 const USBDescConfig *config = dev->config ?
737 dev->config : &dev->device->confs[0];
738
739 data[0] = 0;
740 /*
741 * Default state: Device behavior when this request is received while
742 * the device is in the Default state is not specified.
743 * We return the same value that a configured device would return if
744 * it used the first configuration.
745 */
746 if (config->bmAttributes & 0x40) {
747 data[0] |= 1 << USB_DEVICE_SELF_POWERED0;
748 }
749 if (dev->remote_wakeup) {
750 data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP1;
751 }
752 data[1] = 0x00;
753 p->actual_length = 2;
754 ret = 0;
755 break;
756 }
757 case DeviceOutRequest((0|(0x00 << 5)|0x00)<<8) | USB_REQ_CLEAR_FEATURE0x01:
758 if (value == USB_DEVICE_REMOTE_WAKEUP1) {
759 dev->remote_wakeup = 0;
760 ret = 0;
761 }
762 trace_usb_clear_device_feature(dev->addr, value, ret);
763 break;
764 case DeviceOutRequest((0|(0x00 << 5)|0x00)<<8) | USB_REQ_SET_FEATURE0x03:
765 if (value == USB_DEVICE_REMOTE_WAKEUP1) {
766 dev->remote_wakeup = 1;
767 ret = 0;
768 }
769 trace_usb_set_device_feature(dev->addr, value, ret);
770 break;
771
772 case InterfaceRequest((0x80|(0x00 << 5)|0x01)<<8) | USB_REQ_GET_INTERFACE0x0A:
773 if (index < 0 || index >= dev->ninterfaces) {
774 break;
775 }
776 data[0] = dev->altsetting[index];
777 p->actual_length = 1;
778 ret = 0;
779 break;
780 case InterfaceOutRequest((0|(0x00 << 5)|0x01)<<8) | USB_REQ_SET_INTERFACE0x0B:
781 ret = usb_desc_set_interface(dev, index, value);
782 trace_usb_set_interface(dev->addr, index, value, ret);
783 break;
784
785 }
786 return ret;
787}