1 #include <ctype.h> 2 3 #include "hw/usb.h" 4 #include "hw/usb/desc.h" 5 #include "trace.h" 6 7 /* ------------------------------------------------------------------ */ 8 9 static uint8_t usb_lo(uint16_t val) 10 { 11 return val & 0xff; 12 } 13 14 static uint8_t usb_hi(uint16_t val) 15 { 16 return (val >> 8) & 0xff; 17 } 18 19 int usb_desc_device(const USBDescID *id, const USBDescDevice *dev, 20 uint8_t *dest, size_t len) 21 { 22 uint8_t bLength = 0x12; 23 USBDescriptor *d = (void *)dest; 24 25 if (len < bLength) { 26 return -1; 27 } 28 29 d->bLength = bLength; 30 d->bDescriptorType = USB_DT_DEVICE; 31 32 d->u.device.bcdUSB_lo = usb_lo(dev->bcdUSB); 33 d->u.device.bcdUSB_hi = usb_hi(dev->bcdUSB); 34 d->u.device.bDeviceClass = dev->bDeviceClass; 35 d->u.device.bDeviceSubClass = dev->bDeviceSubClass; 36 d->u.device.bDeviceProtocol = dev->bDeviceProtocol; 37 d->u.device.bMaxPacketSize0 = dev->bMaxPacketSize0; 38 39 d->u.device.idVendor_lo = usb_lo(id->idVendor); 40 d->u.device.idVendor_hi = usb_hi(id->idVendor); 41 d->u.device.idProduct_lo = usb_lo(id->idProduct); 42 d->u.device.idProduct_hi = usb_hi(id->idProduct); 43 d->u.device.bcdDevice_lo = usb_lo(id->bcdDevice); 44 d->u.device.bcdDevice_hi = usb_hi(id->bcdDevice); 45 d->u.device.iManufacturer = id->iManufacturer; 46 d->u.device.iProduct = id->iProduct; 47 d->u.device.iSerialNumber = id->iSerialNumber; 48 49 d->u.device.bNumConfigurations = dev->bNumConfigurations; 50 51 return bLength; 52 } 53 54 int usb_desc_device_qualifier(const USBDescDevice *dev, 55 uint8_t *dest, size_t len) 56 { 57 uint8_t bLength = 0x0a; 58 USBDescriptor *d = (void *)dest; 59 60 if (len < bLength) { 61 return -1; 62 } 63 64 d->bLength = bLength; 65 d->bDescriptorType = USB_DT_DEVICE_QUALIFIER; 66 67 d->u.device_qualifier.bcdUSB_lo = usb_lo(dev->bcdUSB); 68 d->u.device_qualifier.bcdUSB_hi = usb_hi(dev->bcdUSB); 69 d->u.device_qualifier.bDeviceClass = dev->bDeviceClass; 70 d->u.device_qualifier.bDeviceSubClass = dev->bDeviceSubClass; 71 d->u.device_qualifier.bDeviceProtocol = dev->bDeviceProtocol; 72 d->u.device_qualifier.bMaxPacketSize0 = dev->bMaxPacketSize0; 73 d->u.device_qualifier.bNumConfigurations = dev->bNumConfigurations; 74 d->u.device_qualifier.bReserved = 0; 75 76 return bLength; 77 } 78 79 int usb_desc_config(const USBDescConfig *conf, int flags, 80 uint8_t *dest, size_t len) 81 { 82 uint8_t bLength = 0x09; 83 uint16_t wTotalLength = 0; 84 USBDescriptor *d = (void *)dest; 85 int i, rc; 86 87 if (len < bLength) { 88 return -1; 89 } 90 91 d->bLength = bLength; 92 d->bDescriptorType = USB_DT_CONFIG; 93 94 d->u.config.bNumInterfaces = conf->bNumInterfaces; 95 d->u.config.bConfigurationValue = conf->bConfigurationValue; 96 d->u.config.iConfiguration = conf->iConfiguration; 97 d->u.config.bmAttributes = conf->bmAttributes; 98 d->u.config.bMaxPower = conf->bMaxPower; 99 wTotalLength += bLength; 100 101 /* handle grouped interfaces if any */ 102 for (i = 0; i < conf->nif_groups; i++) { 103 rc = usb_desc_iface_group(&(conf->if_groups[i]), flags, 104 dest + wTotalLength, 105 len - wTotalLength); 106 if (rc < 0) { 107 return rc; 108 } 109 wTotalLength += rc; 110 } 111 112 /* handle normal (ungrouped / no IAD) interfaces if any */ 113 for (i = 0; i < conf->nif; i++) { 114 rc = usb_desc_iface(conf->ifs + i, flags, 115 dest + wTotalLength, len - wTotalLength); 116 if (rc < 0) { 117 return rc; 118 } 119 wTotalLength += rc; 120 } 121 122 d->u.config.wTotalLength_lo = usb_lo(wTotalLength); 123 d->u.config.wTotalLength_hi = usb_hi(wTotalLength); 124 return wTotalLength; 125 } 126 127 int usb_desc_iface_group(const USBDescIfaceAssoc *iad, int flags, 128 uint8_t *dest, size_t len) 129 { 130 int pos = 0; 131 int i = 0; 132 133 /* handle interface association descriptor */ 134 uint8_t bLength = 0x08; 135 136 if (len < bLength) { 137 return -1; 138 } 139 140 dest[0x00] = bLength; 141 dest[0x01] = USB_DT_INTERFACE_ASSOC; 142 dest[0x02] = iad->bFirstInterface; 143 dest[0x03] = iad->bInterfaceCount; 144 dest[0x04] = iad->bFunctionClass; 145 dest[0x05] = iad->bFunctionSubClass; 146 dest[0x06] = iad->bFunctionProtocol; 147 dest[0x07] = iad->iFunction; 148 pos += bLength; 149 150 /* handle associated interfaces in this group */ 151 for (i = 0; i < iad->nif; i++) { 152 int rc = usb_desc_iface(&(iad->ifs[i]), flags, dest + pos, len - pos); 153 if (rc < 0) { 154 return rc; 155 } 156 pos += rc; 157 } 158 159 return pos; 160 } 161 162 int usb_desc_iface(const USBDescIface *iface, int flags, 163 uint8_t *dest, size_t len) 164 { 165 uint8_t bLength = 0x09; 166 int i, rc, pos = 0; 167 USBDescriptor *d = (void *)dest; 168 169 if (len < bLength) { 170 return -1; 171 } 172 173 d->bLength = bLength; 174 d->bDescriptorType = USB_DT_INTERFACE; 175 176 d->u.interface.bInterfaceNumber = iface->bInterfaceNumber; 177 d->u.interface.bAlternateSetting = iface->bAlternateSetting; 178 d->u.interface.bNumEndpoints = iface->bNumEndpoints; 179 d->u.interface.bInterfaceClass = iface->bInterfaceClass; 180 d->u.interface.bInterfaceSubClass = iface->bInterfaceSubClass; 181 d->u.interface.bInterfaceProtocol = iface->bInterfaceProtocol; 182 d->u.interface.iInterface = iface->iInterface; 183 pos += bLength; 184 185 for (i = 0; i < iface->ndesc; i++) { 186 rc = usb_desc_other(iface->descs + i, dest + pos, len - pos); 187 if (rc < 0) { 188 return rc; 189 } 190 pos += rc; 191 } 192 193 for (i = 0; i < iface->bNumEndpoints; i++) { 194 rc = usb_desc_endpoint(iface->eps + i, flags, dest + pos, len - pos); 195 if (rc < 0) { 196 return rc; 197 } 198 pos += rc; 199 } 200 201 return pos; 202 } 203 204 int usb_desc_endpoint(const USBDescEndpoint *ep, int flags, 205 uint8_t *dest, size_t len) 206 { 207 uint8_t bLength = ep->is_audio ? 0x09 : 0x07; 208 uint8_t extralen = ep->extra ? ep->extra[0] : 0; 209 uint8_t superlen = (flags & USB_DESC_FLAG_SUPER) ? 0x06 : 0; 210 USBDescriptor *d = (void *)dest; 211 212 if (len < bLength + extralen + superlen) { 213 return -1; 214 } 215 216 d->bLength = bLength; 217 d->bDescriptorType = USB_DT_ENDPOINT; 218 219 d->u.endpoint.bEndpointAddress = ep->bEndpointAddress; 220 d->u.endpoint.bmAttributes = ep->bmAttributes; 221 d->u.endpoint.wMaxPacketSize_lo = usb_lo(ep->wMaxPacketSize); 222 d->u.endpoint.wMaxPacketSize_hi = usb_hi(ep->wMaxPacketSize); 223 d->u.endpoint.bInterval = ep->bInterval; 224 if (ep->is_audio) { 225 d->u.endpoint.bRefresh = ep->bRefresh; 226 d->u.endpoint.bSynchAddress = ep->bSynchAddress; 227 } 228 229 if (superlen) { 230 USBDescriptor *d = (void *)(dest + bLength); 231 232 d->bLength = 0x06; 233 d->bDescriptorType = USB_DT_ENDPOINT_COMPANION; 234 235 d->u.super_endpoint.bMaxBurst = ep->bMaxBurst; 236 d->u.super_endpoint.bmAttributes = ep->bmAttributes_super; 237 d->u.super_endpoint.wBytesPerInterval_lo = 238 usb_lo(ep->wBytesPerInterval); 239 d->u.super_endpoint.wBytesPerInterval_hi = 240 usb_hi(ep->wBytesPerInterval); 241 } 242 243 if (ep->extra) { 244 memcpy(dest + bLength + superlen, ep->extra, extralen); 245 } 246 247 return bLength + extralen + superlen; 248 } 249 250 int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len) 251 { 252 int bLength = desc->length ? desc->length : desc->data[0]; 253 254 if (len < bLength) { 255 return -1; 256 } 257 258 memcpy(dest, desc->data, bLength); 259 return bLength; 260 } 261 262 static int usb_desc_cap_usb2_ext(const USBDesc *desc, uint8_t *dest, size_t len) 263 { 264 uint8_t bLength = 0x07; 265 USBDescriptor *d = (void *)dest; 266 267 if (len < bLength) { 268 return -1; 269 } 270 271 d->bLength = bLength; 272 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 273 d->u.cap.bDevCapabilityType = USB_DEV_CAP_USB2_EXT; 274 275 d->u.cap.u.usb2_ext.bmAttributes_1 = (1 << 1); /* LPM */ 276 d->u.cap.u.usb2_ext.bmAttributes_2 = 0; 277 d->u.cap.u.usb2_ext.bmAttributes_3 = 0; 278 d->u.cap.u.usb2_ext.bmAttributes_4 = 0; 279 280 return bLength; 281 } 282 283 static int usb_desc_cap_super(const USBDesc *desc, uint8_t *dest, size_t len) 284 { 285 uint8_t bLength = 0x0a; 286 USBDescriptor *d = (void *)dest; 287 288 if (len < bLength) { 289 return -1; 290 } 291 292 d->bLength = bLength; 293 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 294 d->u.cap.bDevCapabilityType = USB_DEV_CAP_SUPERSPEED; 295 296 d->u.cap.u.super.bmAttributes = 0; 297 d->u.cap.u.super.wSpeedsSupported_lo = 0; 298 d->u.cap.u.super.wSpeedsSupported_hi = 0; 299 d->u.cap.u.super.bFunctionalitySupport = 0; 300 d->u.cap.u.super.bU1DevExitLat = 0x0a; 301 d->u.cap.u.super.wU2DevExitLat_lo = 0x20; 302 d->u.cap.u.super.wU2DevExitLat_hi = 0; 303 304 if (desc->full) { 305 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 1); 306 d->u.cap.u.super.bFunctionalitySupport = 1; 307 } 308 if (desc->high) { 309 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 2); 310 if (!d->u.cap.u.super.bFunctionalitySupport) { 311 d->u.cap.u.super.bFunctionalitySupport = 2; 312 } 313 } 314 if (desc->super) { 315 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 3); 316 if (!d->u.cap.u.super.bFunctionalitySupport) { 317 d->u.cap.u.super.bFunctionalitySupport = 3; 318 } 319 } 320 321 return bLength; 322 } 323 324 static int usb_desc_bos(const USBDesc *desc, uint8_t *dest, size_t len) 325 { 326 uint8_t bLength = 0x05; 327 uint16_t wTotalLength = 0; 328 uint8_t bNumDeviceCaps = 0; 329 USBDescriptor *d = (void *)dest; 330 int rc; 331 332 if (len < bLength) { 333 return -1; 334 } 335 336 d->bLength = bLength; 337 d->bDescriptorType = USB_DT_BOS; 338 339 wTotalLength += bLength; 340 341 if (desc->high != NULL) { 342 rc = usb_desc_cap_usb2_ext(desc, dest + wTotalLength, 343 len - wTotalLength); 344 if (rc < 0) { 345 return rc; 346 } 347 wTotalLength += rc; 348 bNumDeviceCaps++; 349 } 350 351 if (desc->super != NULL) { 352 rc = usb_desc_cap_super(desc, dest + wTotalLength, 353 len - wTotalLength); 354 if (rc < 0) { 355 return rc; 356 } 357 wTotalLength += rc; 358 bNumDeviceCaps++; 359 } 360 361 d->u.bos.wTotalLength_lo = usb_lo(wTotalLength); 362 d->u.bos.wTotalLength_hi = usb_hi(wTotalLength); 363 d->u.bos.bNumDeviceCaps = bNumDeviceCaps; 364 return wTotalLength; 365 } 366 367 /* ------------------------------------------------------------------ */ 368 369 static void usb_desc_ep_init(USBDevice *dev) 370 { 371 const USBDescIface *iface; 372 int i, e, pid, ep; 373 374 usb_ep_init(dev); 375 for (i = 0; i < dev->ninterfaces; i++) { 376 iface = dev->ifaces[i]; 377 if (iface == NULL) { 378 continue; 379 } 380 for (e = 0; e < iface->bNumEndpoints; e++) { 381 pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN) ? 382 USB_TOKEN_IN : USB_TOKEN_OUT; 383 ep = iface->eps[e].bEndpointAddress & 0x0f; 384 usb_ep_set_type(dev, pid, ep, iface->eps[e].bmAttributes & 0x03); 385 usb_ep_set_ifnum(dev, pid, ep, iface->bInterfaceNumber); 386 usb_ep_set_max_packet_size(dev, pid, ep, 387 iface->eps[e].wMaxPacketSize); 388 } 389 } 390 } 391 392 static const USBDescIface *usb_desc_find_interface(USBDevice *dev, 393 int nif, int alt) 394 { 395 const USBDescIface *iface; 396 int g, i; 397 398 if (!dev->config) { 399 return NULL; 400 } 401 for (g = 0; g < dev->config->nif_groups; g++) { 402 for (i = 0; i < dev->config->if_groups[g].nif; i++) { 403 iface = &dev->config->if_groups[g].ifs[i]; 404 if (iface->bInterfaceNumber == nif && 405 iface->bAlternateSetting == alt) { 406 return iface; 407 } 408 } 409 } 410 for (i = 0; i < dev->config->nif; i++) { 411 iface = &dev->config->ifs[i]; 412 if (iface->bInterfaceNumber == nif && 413 iface->bAlternateSetting == alt) { 414 return iface; 415 } 416 } 417 return NULL; 418 } 419 420 static int usb_desc_set_interface(USBDevice *dev, int index, int value) 421 { 422 const USBDescIface *iface; 423 int old; 424 425 iface = usb_desc_find_interface(dev, index, value); 426 if (iface == NULL) { 427 return -1; 428 } 429 430 old = dev->altsetting[index]; 431 dev->altsetting[index] = value; 432 dev->ifaces[index] = iface; 433 usb_desc_ep_init(dev); 434 435 if (old != value) { 436 usb_device_set_interface(dev, index, old, value); 437 } 438 return 0; 439 } 440 441 static int usb_desc_set_config(USBDevice *dev, int value) 442 { 443 int i; 444 445 if (value == 0) { 446 dev->configuration = 0; 447 dev->ninterfaces = 0; 448 dev->config = NULL; 449 } else { 450 for (i = 0; i < dev->device->bNumConfigurations; i++) { 451 if (dev->device->confs[i].bConfigurationValue == value) { 452 dev->configuration = value; 453 dev->ninterfaces = dev->device->confs[i].bNumInterfaces; 454 dev->config = dev->device->confs + i; 455 assert(dev->ninterfaces <= USB_MAX_INTERFACES); 456 } 457 } 458 if (i < dev->device->bNumConfigurations) { 459 return -1; 460 } 461 } 462 463 for (i = 0; i < dev->ninterfaces; i++) { 464 usb_desc_set_interface(dev, i, 0); 465 } 466 for (; i < USB_MAX_INTERFACES; i++) { 467 dev->altsetting[i] = 0; 468 dev->ifaces[i] = NULL; 469 } 470 471 return 0; 472 } 473 474 static void usb_desc_setdefaults(USBDevice *dev) 475 { 476 const USBDesc *desc = usb_device_get_usb_desc(dev); 477 478 assert(desc != NULL); 479 switch (dev->speed) { 480 case USB_SPEED_LOW: 481 case USB_SPEED_FULL: 482 dev->device = desc->full; 483 break; 484 case USB_SPEED_HIGH: 485 dev->device = desc->high; 486 break; 487 case USB_SPEED_SUPER: 488 dev->device = desc->super; 489 break; 490 } 491 usb_desc_set_config(dev, 0); 492 } 493 494 void usb_desc_init(USBDevice *dev) 495 { 496 const USBDesc *desc = usb_device_get_usb_desc(dev); 497 498 assert(desc != NULL); 499 dev->speed = USB_SPEED_FULL; 500 dev->speedmask = 0; 501 if (desc->full) { 502 dev->speedmask |= USB_SPEED_MASK_FULL; 503 } 504 if (desc->high) { 505 dev->speedmask |= USB_SPEED_MASK_HIGH; 506 } 507 if (desc->super) { 508 dev->speedmask |= USB_SPEED_MASK_SUPER; 509 } 510 usb_desc_setdefaults(dev); 511 } 512 513 void usb_desc_attach(USBDevice *dev) 514 { 515 const USBDesc *desc = usb_device_get_usb_desc(dev); 516 517 assert(desc != NULL); 518 if (desc->super && (dev->port->speedmask & USB_SPEED_MASK_SUPER)) { 519 dev->speed = USB_SPEED_SUPER; 520 } else if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) { 521 dev->speed = USB_SPEED_HIGH; 522 } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) { 523 dev->speed = USB_SPEED_FULL; 524 } else { 525 return; 526 } 527 usb_desc_setdefaults(dev); 528 } 529 530 void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str) 531 { 532 USBDescString *s; 533 534 QLIST_FOREACH(s, &dev->strings, next) { 535 if (s->index == index) { 536 break; 537 } 538 } 539 if (s == NULL) { 540 s = g_malloc0(sizeof(*s)); 541 s->index = index; 542 QLIST_INSERT_HEAD(&dev->strings, s, next); 543 } 544 g_free(s->str); 545 s->str = g_strdup(str); 546 } 547 548 /* 549 * This function creates a serial number for a usb device. 550 * The serial number should: 551 * (a) Be unique within the virtual machine. 552 * (b) Be constant, so you don't get a new one each 553 * time the guest is started. 554 * So we are using the physical location to generate a serial number 555 * from it. It has three pieces: First a fixed, device-specific 556 * prefix. Second the device path of the host controller (which is 557 * the pci address in most cases). Third the physical port path. 558 * Results in serial numbers like this: "314159-0000:00:1d.7-3". 559 */ 560 void usb_desc_create_serial(USBDevice *dev) 561 { 562 DeviceState *hcd = dev->qdev.parent_bus->parent; 563 const USBDesc *desc = usb_device_get_usb_desc(dev); 564 int index = desc->id.iSerialNumber; 565 char serial[64]; 566 char *path; 567 int dst; 568 569 assert(index != 0 && desc->str[index] != NULL); 570 dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]); 571 path = qdev_get_dev_path(hcd); 572 if (path) { 573 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", path); 574 } 575 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", dev->port->path); 576 usb_desc_set_string(dev, index, serial); 577 } 578 579 const char *usb_desc_get_string(USBDevice *dev, uint8_t index) 580 { 581 USBDescString *s; 582 583 QLIST_FOREACH(s, &dev->strings, next) { 584 if (s->index == index) { 585 return s->str; 586 } 587 } 588 return NULL; 589 } 590 591 int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len) 592 { 593 uint8_t bLength, pos, i; 594 const char *str; 595 596 if (len < 4) { 597 return -1; 598 } 599 600 if (index == 0) { 601 /* language ids */ 602 dest[0] = 4; 603 dest[1] = USB_DT_STRING; 604 dest[2] = 0x09; 605 dest[3] = 0x04; 606 return 4; 607 } 608 609 str = usb_desc_get_string(dev, index); 610 if (str == NULL) { 611 str = usb_device_get_usb_desc(dev)->str[index]; 612 if (str == NULL) { 613 return 0; 614 } 615 } 616 617 bLength = strlen(str) * 2 + 2; 618 dest[0] = bLength; 619 dest[1] = USB_DT_STRING; 620 i = 0; pos = 2; 621 while (pos+1 < bLength && pos+1 < len) { 622 dest[pos++] = str[i++]; 623 dest[pos++] = 0; 624 } 625 return pos; 626 } 627 628 int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p, 629 int value, uint8_t *dest, size_t len) 630 { 631 const USBDesc *desc = usb_device_get_usb_desc(dev); 632 const USBDescDevice *other_dev; 633 uint8_t buf[256]; 634 uint8_t type = value >> 8; 635 uint8_t index = value & 0xff; 636 int flags, ret = -1; 637 638 if (dev->speed == USB_SPEED_HIGH) { 639 other_dev = usb_device_get_usb_desc(dev)->full; 640 } else { 641 other_dev = usb_device_get_usb_desc(dev)->high; 642 } 643 644 flags = 0; 645 if (dev->device->bcdUSB >= 0x0300) { 646 flags |= USB_DESC_FLAG_SUPER; 647 } 648 649 switch(type) { 650 case USB_DT_DEVICE: 651 ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf)); 652 trace_usb_desc_device(dev->addr, len, ret); 653 break; 654 case USB_DT_CONFIG: 655 if (index < dev->device->bNumConfigurations) { 656 ret = usb_desc_config(dev->device->confs + index, flags, 657 buf, sizeof(buf)); 658 } 659 trace_usb_desc_config(dev->addr, index, len, ret); 660 break; 661 case USB_DT_STRING: 662 ret = usb_desc_string(dev, index, buf, sizeof(buf)); 663 trace_usb_desc_string(dev->addr, index, len, ret); 664 break; 665 case USB_DT_DEVICE_QUALIFIER: 666 if (other_dev != NULL) { 667 ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf)); 668 } 669 trace_usb_desc_device_qualifier(dev->addr, len, ret); 670 break; 671 case USB_DT_OTHER_SPEED_CONFIG: 672 if (other_dev != NULL && index < other_dev->bNumConfigurations) { 673 ret = usb_desc_config(other_dev->confs + index, flags, 674 buf, sizeof(buf)); 675 buf[0x01] = USB_DT_OTHER_SPEED_CONFIG; 676 } 677 trace_usb_desc_other_speed_config(dev->addr, index, len, ret); 678 break; 679 case USB_DT_BOS: 680 ret = usb_desc_bos(desc, buf, sizeof(buf)); 681 trace_usb_desc_bos(dev->addr, len, ret); 682 break; 683 684 case USB_DT_DEBUG: 685 /* ignore silently */ 686 break; 687 688 default: 689 fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__, 690 dev->addr, type, len); 691 break; 692 } 693 694 if (ret > 0) { 695 if (ret > len) { 696 ret = len; 697 } 698 memcpy(dest, buf, ret); 699 p->actual_length = ret; 700 ret = 0; 701 } 702 return ret; 703 } 704 705 int usb_desc_handle_control(USBDevice *dev, USBPacket *p, 706 int request, int value, int index, int length, uint8_t *data) 707 { 708 const USBDesc *desc = usb_device_get_usb_desc(dev); 709 int ret = -1; 710 711 assert(desc != NULL); 712 switch(request) { 713 case DeviceOutRequest | USB_REQ_SET_ADDRESS: 714 dev->addr = value; 715 trace_usb_set_addr(dev->addr); 716 ret = 0; 717 break; 718 719 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 720 ret = usb_desc_get_descriptor(dev, p, value, data, length); 721 break; 722 723 case DeviceRequest | USB_REQ_GET_CONFIGURATION: 724 /* 725 * 9.4.2: 0 should be returned if the device is unconfigured, otherwise 726 * the non zero value of bConfigurationValue. 727 */ 728 data[0] = dev->config ? dev->config->bConfigurationValue : 0; 729 p->actual_length = 1; 730 ret = 0; 731 break; 732 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: 733 ret = usb_desc_set_config(dev, value); 734 trace_usb_set_config(dev->addr, value, ret); 735 break; 736 737 case DeviceRequest | USB_REQ_GET_STATUS: { 738 const USBDescConfig *config = dev->config ? 739 dev->config : &dev->device->confs[0]; 740 741 data[0] = 0; 742 /* 743 * Default state: Device behavior when this request is received while 744 * the device is in the Default state is not specified. 745 * We return the same value that a configured device would return if 746 * it used the first configuration. 747 */ 748 if (config->bmAttributes & 0x40) { 749 data[0] |= 1 << USB_DEVICE_SELF_POWERED; 750 } 751 if (dev->remote_wakeup) { 752 data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP; 753 } 754 data[1] = 0x00; 755 p->actual_length = 2; 756 ret = 0; 757 break; 758 } 759 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: 760 if (value == USB_DEVICE_REMOTE_WAKEUP) { 761 dev->remote_wakeup = 0; 762 ret = 0; 763 } 764 trace_usb_clear_device_feature(dev->addr, value, ret); 765 break; 766 case DeviceOutRequest | USB_REQ_SET_FEATURE: 767 if (value == USB_DEVICE_REMOTE_WAKEUP) { 768 dev->remote_wakeup = 1; 769 ret = 0; 770 } 771 trace_usb_set_device_feature(dev->addr, value, ret); 772 break; 773 774 case InterfaceRequest | USB_REQ_GET_INTERFACE: 775 if (index < 0 || index >= dev->ninterfaces) { 776 break; 777 } 778 data[0] = dev->altsetting[index]; 779 p->actual_length = 1; 780 ret = 0; 781 break; 782 case InterfaceOutRequest | USB_REQ_SET_INTERFACE: 783 ret = usb_desc_set_interface(dev, index, value); 784 trace_usb_set_interface(dev->addr, index, value, ret); 785 break; 786 787 } 788 return ret; 789 } 790