1 #include <ctype.h> 2 3 #include "hw/usb.h" 4 #include "hw/usb/desc.h" 5 #include "trace.h" 6 7 /* ------------------------------------------------------------------ */ 8 9 int 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_DEVICE; 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 44 int 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_QUALIFIER; 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 69 int 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_CONFIG; 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 } 116 117 int 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_ASSOC; 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 } 151 152 int 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_INTERFACE; 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 } 193 194 int 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) ? 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_ENDPOINT; 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_COMPANION; 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 } 239 240 int 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 } 251 252 static 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_CAPABILITY; 263 d->u.cap.bDevCapabilityType = USB_DEV_CAP_USB2_EXT; 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 } 272 273 static 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_CAPABILITY; 284 d->u.cap.bDevCapabilityType = USB_DEV_CAP_SUPERSPEED; 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 } 313 314 static 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_BOS; 328 329 wTotalLength += bLength; 330 331 if (desc->high != NULL) { 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) { 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 /* ------------------------------------------------------------------ */ 358 359 static 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) { 368 continue; 369 } 370 for (e = 0; e < iface->bNumEndpoints; e++) { 371 pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN) ? 372 USB_TOKEN_IN : USB_TOKEN_OUT; 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 } 383 384 static 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; 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; 410 } 411 412 static 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) { 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 } 432 433 static 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; 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); 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_INTERFACES; i++) { 459 dev->altsetting[i] = 0; 460 dev->ifaces[i] = NULL; 461 } 462 463 return 0; 464 } 465 466 static void usb_desc_setdefaults(USBDevice *dev) 467 { 468 const USBDesc *desc = usb_device_get_usb_desc(dev); 469 470 assert(desc != NULL); 471 switch (dev->speed) { 472 case USB_SPEED_LOW: 473 case USB_SPEED_FULL: 474 dev->device = desc->full; 475 break; 476 case USB_SPEED_HIGH: 477 dev->device = desc->high; 478 break; 479 case USB_SPEED_SUPER: 480 dev->device = desc->super; 481 break; 482 } 483 usb_desc_set_config(dev, 0); 484 } 485 486 void usb_desc_init(USBDevice *dev) 487 { 488 const USBDesc *desc = usb_device_get_usb_desc(dev); 489 490 assert(desc != NULL); 491 dev->speed = USB_SPEED_FULL; 492 dev->speedmask = 0; 493 if (desc->full) { 494 dev->speedmask |= USB_SPEED_MASK_FULL; 495 } 496 if (desc->high) { 497 dev->speedmask |= USB_SPEED_MASK_HIGH; 498 } 499 if (desc->super) { 500 dev->speedmask |= USB_SPEED_MASK_SUPER; 501 } 502 usb_desc_setdefaults(dev); 503 } 504 505 void usb_desc_attach(USBDevice *dev) 506 { 507 const USBDesc *desc = usb_device_get_usb_desc(dev); 508 509 assert(desc != NULL); 510 if (desc->super && (dev->port->speedmask & USB_SPEED_MASK_SUPER)) { 511 dev->speed = USB_SPEED_SUPER; 512 } else if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) { 513 dev->speed = USB_SPEED_HIGH; 514 } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) { 515 dev->speed = USB_SPEED_FULL; 516 } else { 517 return; 518 } 519 usb_desc_setdefaults(dev); 520 } 521 522 void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str) 523 { 524 USBDescString *s; 525 526 QLIST_FOREACH(s, &dev->strings, next) { 527 if (s->index == index) { 528 break; 529 } 530 } 531 if (s == NULL) { 532 s = g_malloc0(sizeof(*s)); 533 s->index = index; 534 QLIST_INSERT_HEAD(&dev->strings, s, next); 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 */ 552 void 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); 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); 574 usb_desc_set_string(dev, index, serial); 575 } 576 577 const char *usb_desc_get_string(USBDevice *dev, uint8_t index) 578 { 579 USBDescString *s; 580 581 QLIST_FOREACH(s, &dev->strings, next) { 582 if (s->index == index) { 583 return s->str; 584 } 585 } 586 return NULL; 587 } 588 589 int 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_STRING; 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) { 609 str = usb_device_get_usb_desc(dev)->str[index]; 610 if (str == NULL) { 611 return 0; 612 } 613 } 614 615 bLength = strlen(str) * 2 + 2; 616 dest[0] = bLength; 617 dest[1] = USB_DT_STRING; 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 } 625 626 int 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_HIGH) { 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; 645 } 646 647 switch(type) { 648 case USB_DT_DEVICE: 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_CONFIG: 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_STRING: 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_QUALIFIER: 664 if (other_dev != NULL) { 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_CONFIG: 670 if (other_dev != NULL && 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_CONFIG; 674 } 675 trace_usb_desc_other_speed_config(dev->addr, index, len, ret); 676 break; 677 case USB_DT_BOS: 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_DEBUG: 683 /* ignore silently */ 684 break; 685 686 default: 687 fprintf(stderr, "%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 } 702 703 int 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); 710 switch(request) { 711 case DeviceOutRequest | USB_REQ_SET_ADDRESS: 712 dev->addr = value; 713 trace_usb_set_addr(dev->addr); 714 ret = 0; 715 break; 716 717 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 718 ret = usb_desc_get_descriptor(dev, p, value, data, length); 719 break; 720 721 case DeviceRequest | USB_REQ_GET_CONFIGURATION: 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 | USB_REQ_SET_CONFIGURATION: 731 ret = usb_desc_set_config(dev, value); 732 trace_usb_set_config(dev->addr, value, ret); 733 break; 734 735 case DeviceRequest | USB_REQ_GET_STATUS: { 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_POWERED; 748 } 749 if (dev->remote_wakeup) { 750 data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP; 751 } 752 data[1] = 0x00; 753 p->actual_length = 2; 754 ret = 0; 755 break; 756 } 757 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: 758 if (value == USB_DEVICE_REMOTE_WAKEUP) { 759 dev->remote_wakeup = 0; 760 ret = 0; 761 } 762 trace_usb_clear_device_feature(dev->addr, value, ret); 763 break; 764 case DeviceOutRequest | USB_REQ_SET_FEATURE: 765 if (value == USB_DEVICE_REMOTE_WAKEUP) { 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 | USB_REQ_GET_INTERFACE: 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 | USB_REQ_SET_INTERFACE: 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 } 788