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 if (ep->extra) { 229 memcpy(dest + bLength, ep->extra, extralen); 230 } 231 232 if (superlen) { 233 USBDescriptor *d = (void *)(dest + bLength + extralen); 234 235 d->bLength = 0x06; 236 d->bDescriptorType = USB_DT_ENDPOINT_COMPANION; 237 238 d->u.super_endpoint.bMaxBurst = ep->bMaxBurst; 239 d->u.super_endpoint.bmAttributes = ep->bmAttributes_super; 240 d->u.super_endpoint.wBytesPerInterval_lo = 241 usb_lo(ep->wBytesPerInterval); 242 d->u.super_endpoint.wBytesPerInterval_hi = 243 usb_hi(ep->wBytesPerInterval); 244 } 245 246 return bLength + extralen + superlen; 247 } 248 249 int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len) 250 { 251 int bLength = desc->length ? desc->length : desc->data[0]; 252 253 if (len < bLength) { 254 return -1; 255 } 256 257 memcpy(dest, desc->data, bLength); 258 return bLength; 259 } 260 261 static int usb_desc_cap_usb2_ext(const USBDesc *desc, uint8_t *dest, size_t len) 262 { 263 uint8_t bLength = 0x07; 264 USBDescriptor *d = (void *)dest; 265 266 if (len < bLength) { 267 return -1; 268 } 269 270 d->bLength = bLength; 271 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 272 d->u.cap.bDevCapabilityType = USB_DEV_CAP_USB2_EXT; 273 274 d->u.cap.u.usb2_ext.bmAttributes_1 = (1 << 1); /* LPM */ 275 d->u.cap.u.usb2_ext.bmAttributes_2 = 0; 276 d->u.cap.u.usb2_ext.bmAttributes_3 = 0; 277 d->u.cap.u.usb2_ext.bmAttributes_4 = 0; 278 279 return bLength; 280 } 281 282 static int usb_desc_cap_super(const USBDesc *desc, uint8_t *dest, size_t len) 283 { 284 uint8_t bLength = 0x0a; 285 USBDescriptor *d = (void *)dest; 286 287 if (len < bLength) { 288 return -1; 289 } 290 291 d->bLength = bLength; 292 d->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 293 d->u.cap.bDevCapabilityType = USB_DEV_CAP_SUPERSPEED; 294 295 d->u.cap.u.super.bmAttributes = 0; 296 d->u.cap.u.super.wSpeedsSupported_lo = 0; 297 d->u.cap.u.super.wSpeedsSupported_hi = 0; 298 d->u.cap.u.super.bFunctionalitySupport = 0; 299 d->u.cap.u.super.bU1DevExitLat = 0x0a; 300 d->u.cap.u.super.wU2DevExitLat_lo = 0x20; 301 d->u.cap.u.super.wU2DevExitLat_hi = 0; 302 303 if (desc->full) { 304 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 1); 305 d->u.cap.u.super.bFunctionalitySupport = 1; 306 } 307 if (desc->high) { 308 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 2); 309 if (!d->u.cap.u.super.bFunctionalitySupport) { 310 d->u.cap.u.super.bFunctionalitySupport = 2; 311 } 312 } 313 if (desc->super) { 314 d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 3); 315 if (!d->u.cap.u.super.bFunctionalitySupport) { 316 d->u.cap.u.super.bFunctionalitySupport = 3; 317 } 318 } 319 320 return bLength; 321 } 322 323 static int usb_desc_bos(const USBDesc *desc, uint8_t *dest, size_t len) 324 { 325 uint8_t bLength = 0x05; 326 uint16_t wTotalLength = 0; 327 uint8_t bNumDeviceCaps = 0; 328 USBDescriptor *d = (void *)dest; 329 int rc; 330 331 if (len < bLength) { 332 return -1; 333 } 334 335 d->bLength = bLength; 336 d->bDescriptorType = USB_DT_BOS; 337 338 wTotalLength += bLength; 339 340 if (desc->high != NULL) { 341 rc = usb_desc_cap_usb2_ext(desc, dest + wTotalLength, 342 len - wTotalLength); 343 if (rc < 0) { 344 return rc; 345 } 346 wTotalLength += rc; 347 bNumDeviceCaps++; 348 } 349 350 if (desc->super != NULL) { 351 rc = usb_desc_cap_super(desc, dest + wTotalLength, 352 len - wTotalLength); 353 if (rc < 0) { 354 return rc; 355 } 356 wTotalLength += rc; 357 bNumDeviceCaps++; 358 } 359 360 d->u.bos.wTotalLength_lo = usb_lo(wTotalLength); 361 d->u.bos.wTotalLength_hi = usb_hi(wTotalLength); 362 d->u.bos.bNumDeviceCaps = bNumDeviceCaps; 363 return wTotalLength; 364 } 365 366 /* ------------------------------------------------------------------ */ 367 368 static void usb_desc_ep_init(USBDevice *dev) 369 { 370 const USBDescIface *iface; 371 int i, e, pid, ep; 372 373 usb_ep_init(dev); 374 for (i = 0; i < dev->ninterfaces; i++) { 375 iface = dev->ifaces[i]; 376 if (iface == NULL) { 377 continue; 378 } 379 for (e = 0; e < iface->bNumEndpoints; e++) { 380 pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN) ? 381 USB_TOKEN_IN : USB_TOKEN_OUT; 382 ep = iface->eps[e].bEndpointAddress & 0x0f; 383 usb_ep_set_type(dev, pid, ep, iface->eps[e].bmAttributes & 0x03); 384 usb_ep_set_ifnum(dev, pid, ep, iface->bInterfaceNumber); 385 usb_ep_set_max_packet_size(dev, pid, ep, 386 iface->eps[e].wMaxPacketSize); 387 } 388 } 389 } 390 391 static const USBDescIface *usb_desc_find_interface(USBDevice *dev, 392 int nif, int alt) 393 { 394 const USBDescIface *iface; 395 int g, i; 396 397 if (!dev->config) { 398 return NULL; 399 } 400 for (g = 0; g < dev->config->nif_groups; g++) { 401 for (i = 0; i < dev->config->if_groups[g].nif; i++) { 402 iface = &dev->config->if_groups[g].ifs[i]; 403 if (iface->bInterfaceNumber == nif && 404 iface->bAlternateSetting == alt) { 405 return iface; 406 } 407 } 408 } 409 for (i = 0; i < dev->config->nif; i++) { 410 iface = &dev->config->ifs[i]; 411 if (iface->bInterfaceNumber == nif && 412 iface->bAlternateSetting == alt) { 413 return iface; 414 } 415 } 416 return NULL; 417 } 418 419 static int usb_desc_set_interface(USBDevice *dev, int index, int value) 420 { 421 const USBDescIface *iface; 422 int old; 423 424 iface = usb_desc_find_interface(dev, index, value); 425 if (iface == NULL) { 426 return -1; 427 } 428 429 old = dev->altsetting[index]; 430 dev->altsetting[index] = value; 431 dev->ifaces[index] = iface; 432 usb_desc_ep_init(dev); 433 434 if (old != value) { 435 usb_device_set_interface(dev, index, old, value); 436 } 437 return 0; 438 } 439 440 static int usb_desc_set_config(USBDevice *dev, int value) 441 { 442 int i; 443 444 if (value == 0) { 445 dev->configuration = 0; 446 dev->ninterfaces = 0; 447 dev->config = NULL; 448 } else { 449 for (i = 0; i < dev->device->bNumConfigurations; i++) { 450 if (dev->device->confs[i].bConfigurationValue == value) { 451 dev->configuration = value; 452 dev->ninterfaces = dev->device->confs[i].bNumInterfaces; 453 dev->config = dev->device->confs + i; 454 assert(dev->ninterfaces <= USB_MAX_INTERFACES); 455 } 456 } 457 if (i < dev->device->bNumConfigurations) { 458 return -1; 459 } 460 } 461 462 for (i = 0; i < dev->ninterfaces; i++) { 463 usb_desc_set_interface(dev, i, 0); 464 } 465 for (; i < USB_MAX_INTERFACES; i++) { 466 dev->altsetting[i] = 0; 467 dev->ifaces[i] = NULL; 468 } 469 470 return 0; 471 } 472 473 static void usb_desc_setdefaults(USBDevice *dev) 474 { 475 const USBDesc *desc = usb_device_get_usb_desc(dev); 476 477 assert(desc != NULL); 478 switch (dev->speed) { 479 case USB_SPEED_LOW: 480 case USB_SPEED_FULL: 481 dev->device = desc->full; 482 break; 483 case USB_SPEED_HIGH: 484 dev->device = desc->high; 485 break; 486 case USB_SPEED_SUPER: 487 dev->device = desc->super; 488 break; 489 } 490 usb_desc_set_config(dev, 0); 491 } 492 493 void usb_desc_init(USBDevice *dev) 494 { 495 const USBDesc *desc = usb_device_get_usb_desc(dev); 496 497 assert(desc != NULL); 498 dev->speed = USB_SPEED_FULL; 499 dev->speedmask = 0; 500 if (desc->full) { 501 dev->speedmask |= USB_SPEED_MASK_FULL; 502 } 503 if (desc->high) { 504 dev->speedmask |= USB_SPEED_MASK_HIGH; 505 } 506 if (desc->super) { 507 dev->speedmask |= USB_SPEED_MASK_SUPER; 508 } 509 usb_desc_setdefaults(dev); 510 } 511 512 void usb_desc_attach(USBDevice *dev) 513 { 514 const USBDesc *desc = usb_device_get_usb_desc(dev); 515 516 assert(desc != NULL); 517 if (desc->super && (dev->port->speedmask & USB_SPEED_MASK_SUPER)) { 518 dev->speed = USB_SPEED_SUPER; 519 } else if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) { 520 dev->speed = USB_SPEED_HIGH; 521 } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) { 522 dev->speed = USB_SPEED_FULL; 523 } else { 524 fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n", 525 usb_device_get_product_desc(dev)); 526 return; 527 } 528 usb_desc_setdefaults(dev); 529 } 530 531 void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str) 532 { 533 USBDescString *s; 534 535 QLIST_FOREACH(s, &dev->strings, next) { 536 if (s->index == index) { 537 break; 538 } 539 } 540 if (s == NULL) { 541 s = g_malloc0(sizeof(*s)); 542 s->index = index; 543 QLIST_INSERT_HEAD(&dev->strings, s, next); 544 } 545 g_free(s->str); 546 s->str = g_strdup(str); 547 } 548 549 /* 550 * This function creates a serial number for a usb device. 551 * The serial number should: 552 * (a) Be unique within the virtual machine. 553 * (b) Be constant, so you don't get a new one each 554 * time the guest is started. 555 * So we are using the physical location to generate a serial number 556 * from it. It has three pieces: First a fixed, device-specific 557 * prefix. Second the device path of the host controller (which is 558 * the pci address in most cases). Third the physical port path. 559 * Results in serial numbers like this: "314159-0000:00:1d.7-3". 560 */ 561 void usb_desc_create_serial(USBDevice *dev) 562 { 563 DeviceState *hcd = dev->qdev.parent_bus->parent; 564 const USBDesc *desc = usb_device_get_usb_desc(dev); 565 int index = desc->id.iSerialNumber; 566 char serial[64]; 567 char *path; 568 int dst; 569 570 assert(index != 0 && desc->str[index] != NULL); 571 dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]); 572 path = qdev_get_dev_path(hcd); 573 if (path) { 574 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", path); 575 } 576 dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", dev->port->path); 577 usb_desc_set_string(dev, index, serial); 578 } 579 580 const char *usb_desc_get_string(USBDevice *dev, uint8_t index) 581 { 582 USBDescString *s; 583 584 QLIST_FOREACH(s, &dev->strings, next) { 585 if (s->index == index) { 586 return s->str; 587 } 588 } 589 return NULL; 590 } 591 592 int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len) 593 { 594 uint8_t bLength, pos, i; 595 const char *str; 596 597 if (len < 4) { 598 return -1; 599 } 600 601 if (index == 0) { 602 /* language ids */ 603 dest[0] = 4; 604 dest[1] = USB_DT_STRING; 605 dest[2] = 0x09; 606 dest[3] = 0x04; 607 return 4; 608 } 609 610 str = usb_desc_get_string(dev, index); 611 if (str == NULL) { 612 str = usb_device_get_usb_desc(dev)->str[index]; 613 if (str == NULL) { 614 return 0; 615 } 616 } 617 618 bLength = strlen(str) * 2 + 2; 619 dest[0] = bLength; 620 dest[1] = USB_DT_STRING; 621 i = 0; pos = 2; 622 while (pos+1 < bLength && pos+1 < len) { 623 dest[pos++] = str[i++]; 624 dest[pos++] = 0; 625 } 626 return pos; 627 } 628 629 int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p, 630 int value, uint8_t *dest, size_t len) 631 { 632 const USBDesc *desc = usb_device_get_usb_desc(dev); 633 const USBDescDevice *other_dev; 634 uint8_t buf[256]; 635 uint8_t type = value >> 8; 636 uint8_t index = value & 0xff; 637 int flags, ret = -1; 638 639 if (dev->speed == USB_SPEED_HIGH) { 640 other_dev = usb_device_get_usb_desc(dev)->full; 641 } else { 642 other_dev = usb_device_get_usb_desc(dev)->high; 643 } 644 645 flags = 0; 646 if (dev->device->bcdUSB >= 0x0300) { 647 flags |= USB_DESC_FLAG_SUPER; 648 } 649 650 switch(type) { 651 case USB_DT_DEVICE: 652 ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf)); 653 trace_usb_desc_device(dev->addr, len, ret); 654 break; 655 case USB_DT_CONFIG: 656 if (index < dev->device->bNumConfigurations) { 657 ret = usb_desc_config(dev->device->confs + index, flags, 658 buf, sizeof(buf)); 659 } 660 trace_usb_desc_config(dev->addr, index, len, ret); 661 break; 662 case USB_DT_STRING: 663 ret = usb_desc_string(dev, index, buf, sizeof(buf)); 664 trace_usb_desc_string(dev->addr, index, len, ret); 665 break; 666 case USB_DT_DEVICE_QUALIFIER: 667 if (other_dev != NULL) { 668 ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf)); 669 } 670 trace_usb_desc_device_qualifier(dev->addr, len, ret); 671 break; 672 case USB_DT_OTHER_SPEED_CONFIG: 673 if (other_dev != NULL && index < other_dev->bNumConfigurations) { 674 ret = usb_desc_config(other_dev->confs + index, flags, 675 buf, sizeof(buf)); 676 buf[0x01] = USB_DT_OTHER_SPEED_CONFIG; 677 } 678 trace_usb_desc_other_speed_config(dev->addr, index, len, ret); 679 break; 680 case USB_DT_BOS: 681 ret = usb_desc_bos(desc, buf, sizeof(buf)); 682 trace_usb_desc_bos(dev->addr, len, ret); 683 break; 684 685 case USB_DT_DEBUG: 686 /* ignore silently */ 687 break; 688 689 default: 690 fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__, 691 dev->addr, type, len); 692 break; 693 } 694 695 if (ret > 0) { 696 if (ret > len) { 697 ret = len; 698 } 699 memcpy(dest, buf, ret); 700 p->actual_length = ret; 701 ret = 0; 702 } 703 return ret; 704 } 705 706 int usb_desc_handle_control(USBDevice *dev, USBPacket *p, 707 int request, int value, int index, int length, uint8_t *data) 708 { 709 const USBDesc *desc = usb_device_get_usb_desc(dev); 710 int ret = -1; 711 712 assert(desc != NULL); 713 switch(request) { 714 case DeviceOutRequest | USB_REQ_SET_ADDRESS: 715 dev->addr = value; 716 trace_usb_set_addr(dev->addr); 717 ret = 0; 718 break; 719 720 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 721 ret = usb_desc_get_descriptor(dev, p, value, data, length); 722 break; 723 724 case DeviceRequest | USB_REQ_GET_CONFIGURATION: 725 /* 726 * 9.4.2: 0 should be returned if the device is unconfigured, otherwise 727 * the non zero value of bConfigurationValue. 728 */ 729 data[0] = dev->config ? dev->config->bConfigurationValue : 0; 730 p->actual_length = 1; 731 ret = 0; 732 break; 733 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: 734 ret = usb_desc_set_config(dev, value); 735 trace_usb_set_config(dev->addr, value, ret); 736 break; 737 738 case DeviceRequest | USB_REQ_GET_STATUS: { 739 const USBDescConfig *config = dev->config ? 740 dev->config : &dev->device->confs[0]; 741 742 data[0] = 0; 743 /* 744 * Default state: Device behavior when this request is received while 745 * the device is in the Default state is not specified. 746 * We return the same value that a configured device would return if 747 * it used the first configuration. 748 */ 749 if (config->bmAttributes & 0x40) { 750 data[0] |= 1 << USB_DEVICE_SELF_POWERED; 751 } 752 if (dev->remote_wakeup) { 753 data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP; 754 } 755 data[1] = 0x00; 756 p->actual_length = 2; 757 ret = 0; 758 break; 759 } 760 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: 761 if (value == USB_DEVICE_REMOTE_WAKEUP) { 762 dev->remote_wakeup = 0; 763 ret = 0; 764 } 765 trace_usb_clear_device_feature(dev->addr, value, ret); 766 break; 767 case DeviceOutRequest | USB_REQ_SET_FEATURE: 768 if (value == USB_DEVICE_REMOTE_WAKEUP) { 769 dev->remote_wakeup = 1; 770 ret = 0; 771 } 772 trace_usb_set_device_feature(dev->addr, value, ret); 773 break; 774 775 case InterfaceRequest | USB_REQ_GET_INTERFACE: 776 if (index < 0 || index >= dev->ninterfaces) { 777 break; 778 } 779 data[0] = dev->altsetting[index]; 780 p->actual_length = 1; 781 ret = 0; 782 break; 783 case InterfaceOutRequest | USB_REQ_SET_INTERFACE: 784 ret = usb_desc_set_interface(dev, index, value); 785 trace_usb_set_interface(dev->addr, index, value, ret); 786 break; 787 788 } 789 return ret; 790 } 791