1 /* 2 * uvc_gadget.c -- USB Video Class Gadget driver 3 * 4 * Copyright (C) 2009-2010 5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/device.h> 15 #include <linux/errno.h> 16 #include <linux/fs.h> 17 #include <linux/list.h> 18 #include <linux/mutex.h> 19 #include <linux/string.h> 20 #include <linux/usb/ch9.h> 21 #include <linux/usb/gadget.h> 22 #include <linux/usb/video.h> 23 #include <linux/vmalloc.h> 24 #include <linux/wait.h> 25 26 #include <media/v4l2-dev.h> 27 #include <media/v4l2-event.h> 28 29 #include "uvc.h" 30 31 unsigned int uvc_gadget_trace_param; 32 33 /*-------------------------------------------------------------------------*/ 34 35 /* module parameters specific to the Video streaming endpoint */ 36 static unsigned int streaming_interval = 1; 37 module_param(streaming_interval, uint, S_IRUGO|S_IWUSR); 38 MODULE_PARM_DESC(streaming_interval, "1 - 16"); 39 40 static unsigned int streaming_maxpacket = 1024; 41 module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR); 42 MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)"); 43 44 static unsigned int streaming_maxburst; 45 module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR); 46 MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)"); 47 48 /* -------------------------------------------------------------------------- 49 * Function descriptors 50 */ 51 52 /* string IDs are assigned dynamically */ 53 54 #define UVC_STRING_CONTROL_IDX 0 55 #define UVC_STRING_STREAMING_IDX 1 56 57 static struct usb_string uvc_en_us_strings[] = { 58 [UVC_STRING_CONTROL_IDX].s = "UVC Camera", 59 [UVC_STRING_STREAMING_IDX].s = "Video Streaming", 60 { } 61 }; 62 63 static struct usb_gadget_strings uvc_stringtab = { 64 .language = 0x0409, /* en-us */ 65 .strings = uvc_en_us_strings, 66 }; 67 68 static struct usb_gadget_strings *uvc_function_strings[] = { 69 &uvc_stringtab, 70 NULL, 71 }; 72 73 #define UVC_INTF_VIDEO_CONTROL 0 74 #define UVC_INTF_VIDEO_STREAMING 1 75 76 #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */ 77 78 static struct usb_interface_assoc_descriptor uvc_iad __initdata = { 79 .bLength = sizeof(uvc_iad), 80 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 81 .bFirstInterface = 0, 82 .bInterfaceCount = 2, 83 .bFunctionClass = USB_CLASS_VIDEO, 84 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION, 85 .bFunctionProtocol = 0x00, 86 .iFunction = 0, 87 }; 88 89 static struct usb_interface_descriptor uvc_control_intf __initdata = { 90 .bLength = USB_DT_INTERFACE_SIZE, 91 .bDescriptorType = USB_DT_INTERFACE, 92 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL, 93 .bAlternateSetting = 0, 94 .bNumEndpoints = 1, 95 .bInterfaceClass = USB_CLASS_VIDEO, 96 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL, 97 .bInterfaceProtocol = 0x00, 98 .iInterface = 0, 99 }; 100 101 static struct usb_endpoint_descriptor uvc_control_ep __initdata = { 102 .bLength = USB_DT_ENDPOINT_SIZE, 103 .bDescriptorType = USB_DT_ENDPOINT, 104 .bEndpointAddress = USB_DIR_IN, 105 .bmAttributes = USB_ENDPOINT_XFER_INT, 106 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 107 .bInterval = 8, 108 }; 109 110 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp __initdata = { 111 .bLength = sizeof(uvc_ss_control_comp), 112 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 113 /* The following 3 values can be tweaked if necessary. */ 114 .bMaxBurst = 0, 115 .bmAttributes = 0, 116 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 117 }; 118 119 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = { 120 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE, 121 .bDescriptorType = USB_DT_CS_ENDPOINT, 122 .bDescriptorSubType = UVC_EP_INTERRUPT, 123 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 124 }; 125 126 static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = { 127 .bLength = USB_DT_INTERFACE_SIZE, 128 .bDescriptorType = USB_DT_INTERFACE, 129 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 130 .bAlternateSetting = 0, 131 .bNumEndpoints = 0, 132 .bInterfaceClass = USB_CLASS_VIDEO, 133 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 134 .bInterfaceProtocol = 0x00, 135 .iInterface = 0, 136 }; 137 138 static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = { 139 .bLength = USB_DT_INTERFACE_SIZE, 140 .bDescriptorType = USB_DT_INTERFACE, 141 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 142 .bAlternateSetting = 1, 143 .bNumEndpoints = 1, 144 .bInterfaceClass = USB_CLASS_VIDEO, 145 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 146 .bInterfaceProtocol = 0x00, 147 .iInterface = 0, 148 }; 149 150 static struct usb_endpoint_descriptor uvc_fs_streaming_ep __initdata = { 151 .bLength = USB_DT_ENDPOINT_SIZE, 152 .bDescriptorType = USB_DT_ENDPOINT, 153 .bEndpointAddress = USB_DIR_IN, 154 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 155 | USB_ENDPOINT_XFER_ISOC, 156 /* The wMaxPacketSize and bInterval values will be initialized from 157 * module parameters. 158 */ 159 }; 160 161 static struct usb_endpoint_descriptor uvc_hs_streaming_ep __initdata = { 162 .bLength = USB_DT_ENDPOINT_SIZE, 163 .bDescriptorType = USB_DT_ENDPOINT, 164 .bEndpointAddress = USB_DIR_IN, 165 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 166 | USB_ENDPOINT_XFER_ISOC, 167 /* The wMaxPacketSize and bInterval values will be initialized from 168 * module parameters. 169 */ 170 }; 171 172 static struct usb_endpoint_descriptor uvc_ss_streaming_ep __initdata = { 173 .bLength = USB_DT_ENDPOINT_SIZE, 174 .bDescriptorType = USB_DT_ENDPOINT, 175 176 .bEndpointAddress = USB_DIR_IN, 177 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 178 | USB_ENDPOINT_XFER_ISOC, 179 /* The wMaxPacketSize and bInterval values will be initialized from 180 * module parameters. 181 */ 182 }; 183 184 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp __initdata = { 185 .bLength = sizeof(uvc_ss_streaming_comp), 186 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 187 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be 188 * initialized from module parameters. 189 */ 190 }; 191 192 static const struct usb_descriptor_header * const uvc_fs_streaming[] = { 193 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 194 (struct usb_descriptor_header *) &uvc_fs_streaming_ep, 195 NULL, 196 }; 197 198 static const struct usb_descriptor_header * const uvc_hs_streaming[] = { 199 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 200 (struct usb_descriptor_header *) &uvc_hs_streaming_ep, 201 NULL, 202 }; 203 204 static const struct usb_descriptor_header * const uvc_ss_streaming[] = { 205 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 206 (struct usb_descriptor_header *) &uvc_ss_streaming_ep, 207 (struct usb_descriptor_header *) &uvc_ss_streaming_comp, 208 NULL, 209 }; 210 211 /* -------------------------------------------------------------------------- 212 * Control requests 213 */ 214 215 static void 216 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) 217 { 218 struct uvc_device *uvc = req->context; 219 struct v4l2_event v4l2_event; 220 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 221 222 if (uvc->event_setup_out) { 223 uvc->event_setup_out = 0; 224 225 memset(&v4l2_event, 0, sizeof(v4l2_event)); 226 v4l2_event.type = UVC_EVENT_DATA; 227 uvc_event->data.length = req->actual; 228 memcpy(&uvc_event->data.data, req->buf, req->actual); 229 v4l2_event_queue(uvc->vdev, &v4l2_event); 230 } 231 } 232 233 static int 234 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 235 { 236 struct uvc_device *uvc = to_uvc(f); 237 struct v4l2_event v4l2_event; 238 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 239 240 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n", 241 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue), 242 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength)); 243 */ 244 245 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) { 246 INFO(f->config->cdev, "invalid request type\n"); 247 return -EINVAL; 248 } 249 250 /* Stall too big requests. */ 251 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE) 252 return -EINVAL; 253 254 memset(&v4l2_event, 0, sizeof(v4l2_event)); 255 v4l2_event.type = UVC_EVENT_SETUP; 256 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req)); 257 v4l2_event_queue(uvc->vdev, &v4l2_event); 258 259 return 0; 260 } 261 262 void uvc_function_setup_continue(struct uvc_device *uvc) 263 { 264 struct usb_composite_dev *cdev = uvc->func.config->cdev; 265 266 usb_composite_setup_continue(cdev); 267 } 268 269 static int 270 uvc_function_get_alt(struct usb_function *f, unsigned interface) 271 { 272 struct uvc_device *uvc = to_uvc(f); 273 274 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface); 275 276 if (interface == uvc->control_intf) 277 return 0; 278 else if (interface != uvc->streaming_intf) 279 return -EINVAL; 280 else 281 return uvc->state == UVC_STATE_STREAMING ? 1 : 0; 282 } 283 284 static int 285 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt) 286 { 287 struct uvc_device *uvc = to_uvc(f); 288 struct v4l2_event v4l2_event; 289 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 290 int ret; 291 292 INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt); 293 294 if (interface == uvc->control_intf) { 295 if (alt) 296 return -EINVAL; 297 298 if (uvc->state == UVC_STATE_DISCONNECTED) { 299 memset(&v4l2_event, 0, sizeof(v4l2_event)); 300 v4l2_event.type = UVC_EVENT_CONNECT; 301 uvc_event->speed = f->config->cdev->gadget->speed; 302 v4l2_event_queue(uvc->vdev, &v4l2_event); 303 304 uvc->state = UVC_STATE_CONNECTED; 305 } 306 307 return 0; 308 } 309 310 if (interface != uvc->streaming_intf) 311 return -EINVAL; 312 313 /* TODO 314 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep)) 315 return alt ? -EINVAL : 0; 316 */ 317 318 switch (alt) { 319 case 0: 320 if (uvc->state != UVC_STATE_STREAMING) 321 return 0; 322 323 if (uvc->video.ep) 324 usb_ep_disable(uvc->video.ep); 325 326 memset(&v4l2_event, 0, sizeof(v4l2_event)); 327 v4l2_event.type = UVC_EVENT_STREAMOFF; 328 v4l2_event_queue(uvc->vdev, &v4l2_event); 329 330 uvc->state = UVC_STATE_CONNECTED; 331 return 0; 332 333 case 1: 334 if (uvc->state != UVC_STATE_CONNECTED) 335 return 0; 336 337 if (uvc->video.ep) { 338 ret = config_ep_by_speed(f->config->cdev->gadget, 339 &(uvc->func), uvc->video.ep); 340 if (ret) 341 return ret; 342 usb_ep_enable(uvc->video.ep); 343 } 344 345 memset(&v4l2_event, 0, sizeof(v4l2_event)); 346 v4l2_event.type = UVC_EVENT_STREAMON; 347 v4l2_event_queue(uvc->vdev, &v4l2_event); 348 return USB_GADGET_DELAYED_STATUS; 349 350 default: 351 return -EINVAL; 352 } 353 } 354 355 static void 356 uvc_function_disable(struct usb_function *f) 357 { 358 struct uvc_device *uvc = to_uvc(f); 359 struct v4l2_event v4l2_event; 360 361 INFO(f->config->cdev, "uvc_function_disable\n"); 362 363 memset(&v4l2_event, 0, sizeof(v4l2_event)); 364 v4l2_event.type = UVC_EVENT_DISCONNECT; 365 v4l2_event_queue(uvc->vdev, &v4l2_event); 366 367 uvc->state = UVC_STATE_DISCONNECTED; 368 } 369 370 /* -------------------------------------------------------------------------- 371 * Connection / disconnection 372 */ 373 374 void 375 uvc_function_connect(struct uvc_device *uvc) 376 { 377 struct usb_composite_dev *cdev = uvc->func.config->cdev; 378 int ret; 379 380 if ((ret = usb_function_activate(&uvc->func)) < 0) 381 INFO(cdev, "UVC connect failed with %d\n", ret); 382 } 383 384 void 385 uvc_function_disconnect(struct uvc_device *uvc) 386 { 387 struct usb_composite_dev *cdev = uvc->func.config->cdev; 388 int ret; 389 390 if ((ret = usb_function_deactivate(&uvc->func)) < 0) 391 INFO(cdev, "UVC disconnect failed with %d\n", ret); 392 } 393 394 /* -------------------------------------------------------------------------- 395 * USB probe and disconnect 396 */ 397 398 static int 399 uvc_register_video(struct uvc_device *uvc) 400 { 401 struct usb_composite_dev *cdev = uvc->func.config->cdev; 402 struct video_device *video; 403 404 /* TODO reference counting. */ 405 video = video_device_alloc(); 406 if (video == NULL) 407 return -ENOMEM; 408 409 video->v4l2_dev = &uvc->v4l2_dev; 410 video->fops = &uvc_v4l2_fops; 411 video->release = video_device_release; 412 strlcpy(video->name, cdev->gadget->name, sizeof(video->name)); 413 414 uvc->vdev = video; 415 video_set_drvdata(video, uvc); 416 417 return video_register_device(video, VFL_TYPE_GRABBER, -1); 418 } 419 420 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \ 421 do { \ 422 memcpy(mem, desc, (desc)->bLength); \ 423 *(dst)++ = mem; \ 424 mem += (desc)->bLength; \ 425 } while (0); 426 427 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \ 428 do { \ 429 const struct usb_descriptor_header * const *__src; \ 430 for (__src = src; *__src; ++__src) { \ 431 memcpy(mem, *__src, (*__src)->bLength); \ 432 *dst++ = mem; \ 433 mem += (*__src)->bLength; \ 434 } \ 435 } while (0) 436 437 static struct usb_descriptor_header ** __init 438 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) 439 { 440 struct uvc_input_header_descriptor *uvc_streaming_header; 441 struct uvc_header_descriptor *uvc_control_header; 442 const struct uvc_descriptor_header * const *uvc_control_desc; 443 const struct uvc_descriptor_header * const *uvc_streaming_cls; 444 const struct usb_descriptor_header * const *uvc_streaming_std; 445 const struct usb_descriptor_header * const *src; 446 struct usb_descriptor_header **dst; 447 struct usb_descriptor_header **hdr; 448 unsigned int control_size; 449 unsigned int streaming_size; 450 unsigned int n_desc; 451 unsigned int bytes; 452 void *mem; 453 454 switch (speed) { 455 case USB_SPEED_SUPER: 456 uvc_control_desc = uvc->desc.ss_control; 457 uvc_streaming_cls = uvc->desc.ss_streaming; 458 uvc_streaming_std = uvc_ss_streaming; 459 break; 460 461 case USB_SPEED_HIGH: 462 uvc_control_desc = uvc->desc.fs_control; 463 uvc_streaming_cls = uvc->desc.hs_streaming; 464 uvc_streaming_std = uvc_hs_streaming; 465 break; 466 467 case USB_SPEED_FULL: 468 default: 469 uvc_control_desc = uvc->desc.fs_control; 470 uvc_streaming_cls = uvc->desc.fs_streaming; 471 uvc_streaming_std = uvc_fs_streaming; 472 break; 473 } 474 475 /* Descriptors layout 476 * 477 * uvc_iad 478 * uvc_control_intf 479 * Class-specific UVC control descriptors 480 * uvc_control_ep 481 * uvc_control_cs_ep 482 * uvc_ss_control_comp (for SS only) 483 * uvc_streaming_intf_alt0 484 * Class-specific UVC streaming descriptors 485 * uvc_{fs|hs}_streaming 486 */ 487 488 /* Count descriptors and compute their size. */ 489 control_size = 0; 490 streaming_size = 0; 491 bytes = uvc_iad.bLength + uvc_control_intf.bLength 492 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength 493 + uvc_streaming_intf_alt0.bLength; 494 495 if (speed == USB_SPEED_SUPER) { 496 bytes += uvc_ss_control_comp.bLength; 497 n_desc = 6; 498 } else { 499 n_desc = 5; 500 } 501 502 for (src = (const struct usb_descriptor_header **)uvc_control_desc; 503 *src; ++src) { 504 control_size += (*src)->bLength; 505 bytes += (*src)->bLength; 506 n_desc++; 507 } 508 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; 509 *src; ++src) { 510 streaming_size += (*src)->bLength; 511 bytes += (*src)->bLength; 512 n_desc++; 513 } 514 for (src = uvc_streaming_std; *src; ++src) { 515 bytes += (*src)->bLength; 516 n_desc++; 517 } 518 519 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL); 520 if (mem == NULL) 521 return NULL; 522 523 hdr = mem; 524 dst = mem; 525 mem += (n_desc + 1) * sizeof(*src); 526 527 /* Copy the descriptors. */ 528 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad); 529 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf); 530 531 uvc_control_header = mem; 532 UVC_COPY_DESCRIPTORS(mem, dst, 533 (const struct usb_descriptor_header **)uvc_control_desc); 534 uvc_control_header->wTotalLength = cpu_to_le16(control_size); 535 uvc_control_header->bInCollection = 1; 536 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf; 537 538 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep); 539 if (speed == USB_SPEED_SUPER) 540 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); 541 542 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep); 543 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0); 544 545 uvc_streaming_header = mem; 546 UVC_COPY_DESCRIPTORS(mem, dst, 547 (const struct usb_descriptor_header**)uvc_streaming_cls); 548 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size); 549 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address; 550 551 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std); 552 553 *dst = NULL; 554 return hdr; 555 } 556 557 static void 558 uvc_function_unbind(struct usb_configuration *c, struct usb_function *f) 559 { 560 struct usb_composite_dev *cdev = c->cdev; 561 struct uvc_device *uvc = to_uvc(f); 562 563 INFO(cdev, "uvc_function_unbind\n"); 564 565 video_unregister_device(uvc->vdev); 566 v4l2_device_unregister(&uvc->v4l2_dev); 567 uvc->control_ep->driver_data = NULL; 568 uvc->video.ep->driver_data = NULL; 569 570 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = 0; 571 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 572 kfree(uvc->control_buf); 573 574 usb_free_all_descriptors(f); 575 576 kfree(uvc); 577 } 578 579 static int __init 580 uvc_function_bind(struct usb_configuration *c, struct usb_function *f) 581 { 582 struct usb_composite_dev *cdev = c->cdev; 583 struct uvc_device *uvc = to_uvc(f); 584 unsigned int max_packet_mult; 585 unsigned int max_packet_size; 586 struct usb_ep *ep; 587 int ret = -EINVAL; 588 589 INFO(cdev, "uvc_function_bind\n"); 590 591 /* Sanity check the streaming endpoint module parameters. 592 */ 593 streaming_interval = clamp(streaming_interval, 1U, 16U); 594 streaming_maxpacket = clamp(streaming_maxpacket, 1U, 3072U); 595 streaming_maxburst = min(streaming_maxburst, 15U); 596 597 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the 598 * module parameters. 599 * 600 * NOTE: We assume that the user knows what they are doing and won't 601 * give parameters that their UDC doesn't support. 602 */ 603 if (streaming_maxpacket <= 1024) { 604 max_packet_mult = 1; 605 max_packet_size = streaming_maxpacket; 606 } else if (streaming_maxpacket <= 2048) { 607 max_packet_mult = 2; 608 max_packet_size = streaming_maxpacket / 2; 609 } else { 610 max_packet_mult = 3; 611 max_packet_size = streaming_maxpacket / 3; 612 } 613 614 uvc_fs_streaming_ep.wMaxPacketSize = min(streaming_maxpacket, 1023U); 615 uvc_fs_streaming_ep.bInterval = streaming_interval; 616 617 uvc_hs_streaming_ep.wMaxPacketSize = max_packet_size; 618 uvc_hs_streaming_ep.wMaxPacketSize |= ((max_packet_mult - 1) << 11); 619 uvc_hs_streaming_ep.bInterval = streaming_interval; 620 621 uvc_ss_streaming_ep.wMaxPacketSize = max_packet_size; 622 uvc_ss_streaming_ep.bInterval = streaming_interval; 623 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; 624 uvc_ss_streaming_comp.bMaxBurst = streaming_maxburst; 625 uvc_ss_streaming_comp.wBytesPerInterval = 626 max_packet_size * max_packet_mult * streaming_maxburst; 627 628 /* Allocate endpoints. */ 629 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); 630 if (!ep) { 631 INFO(cdev, "Unable to allocate control EP\n"); 632 goto error; 633 } 634 uvc->control_ep = ep; 635 ep->driver_data = uvc; 636 637 if (gadget_is_superspeed(c->cdev->gadget)) 638 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, 639 &uvc_ss_streaming_comp); 640 else if (gadget_is_dualspeed(cdev->gadget)) 641 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); 642 else 643 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); 644 645 if (!ep) { 646 INFO(cdev, "Unable to allocate streaming EP\n"); 647 goto error; 648 } 649 uvc->video.ep = ep; 650 ep->driver_data = uvc; 651 652 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 653 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 654 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; 655 656 /* Allocate interface IDs. */ 657 if ((ret = usb_interface_id(c, f)) < 0) 658 goto error; 659 uvc_iad.bFirstInterface = ret; 660 uvc_control_intf.bInterfaceNumber = ret; 661 uvc->control_intf = ret; 662 663 if ((ret = usb_interface_id(c, f)) < 0) 664 goto error; 665 uvc_streaming_intf_alt0.bInterfaceNumber = ret; 666 uvc_streaming_intf_alt1.bInterfaceNumber = ret; 667 uvc->streaming_intf = ret; 668 669 /* Copy descriptors */ 670 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); 671 if (gadget_is_dualspeed(cdev->gadget)) 672 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); 673 if (gadget_is_superspeed(c->cdev->gadget)) 674 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); 675 676 /* Preallocate control endpoint request. */ 677 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 678 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL); 679 if (uvc->control_req == NULL || uvc->control_buf == NULL) { 680 ret = -ENOMEM; 681 goto error; 682 } 683 684 uvc->control_req->buf = uvc->control_buf; 685 uvc->control_req->complete = uvc_function_ep0_complete; 686 uvc->control_req->context = uvc; 687 688 /* Avoid letting this gadget enumerate until the userspace server is 689 * active. 690 */ 691 if ((ret = usb_function_deactivate(f)) < 0) 692 goto error; 693 694 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { 695 printk(KERN_INFO "v4l2_device_register failed\n"); 696 goto error; 697 } 698 699 /* Initialise video. */ 700 ret = uvc_video_init(&uvc->video); 701 if (ret < 0) 702 goto error; 703 704 /* Register a V4L2 device. */ 705 ret = uvc_register_video(uvc); 706 if (ret < 0) { 707 printk(KERN_INFO "Unable to register video device\n"); 708 goto error; 709 } 710 711 return 0; 712 713 error: 714 v4l2_device_unregister(&uvc->v4l2_dev); 715 if (uvc->vdev) 716 video_device_release(uvc->vdev); 717 718 if (uvc->control_ep) 719 uvc->control_ep->driver_data = NULL; 720 if (uvc->video.ep) 721 uvc->video.ep->driver_data = NULL; 722 723 if (uvc->control_req) { 724 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 725 kfree(uvc->control_buf); 726 } 727 728 usb_free_all_descriptors(f); 729 return ret; 730 } 731 732 /* -------------------------------------------------------------------------- 733 * USB gadget function 734 */ 735 736 /** 737 * uvc_bind_config - add a UVC function to a configuration 738 * @c: the configuration to support the UVC instance 739 * Context: single threaded during gadget setup 740 * 741 * Returns zero on success, else negative errno. 742 * 743 * Caller must have called @uvc_setup(). Caller is also responsible for 744 * calling @uvc_cleanup() before module unload. 745 */ 746 int __init 747 uvc_bind_config(struct usb_configuration *c, 748 const struct uvc_descriptor_header * const *fs_control, 749 const struct uvc_descriptor_header * const *ss_control, 750 const struct uvc_descriptor_header * const *fs_streaming, 751 const struct uvc_descriptor_header * const *hs_streaming, 752 const struct uvc_descriptor_header * const *ss_streaming) 753 { 754 struct uvc_device *uvc; 755 int ret = 0; 756 757 /* TODO Check if the USB device controller supports the required 758 * features. 759 */ 760 if (!gadget_is_dualspeed(c->cdev->gadget)) 761 return -EINVAL; 762 763 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL); 764 if (uvc == NULL) 765 return -ENOMEM; 766 767 uvc->state = UVC_STATE_DISCONNECTED; 768 769 /* Validate the descriptors. */ 770 if (fs_control == NULL || fs_control[0] == NULL || 771 fs_control[0]->bDescriptorSubType != UVC_VC_HEADER) 772 goto error; 773 774 if (ss_control == NULL || ss_control[0] == NULL || 775 ss_control[0]->bDescriptorSubType != UVC_VC_HEADER) 776 goto error; 777 778 if (fs_streaming == NULL || fs_streaming[0] == NULL || 779 fs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER) 780 goto error; 781 782 if (hs_streaming == NULL || hs_streaming[0] == NULL || 783 hs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER) 784 goto error; 785 786 if (ss_streaming == NULL || ss_streaming[0] == NULL || 787 ss_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER) 788 goto error; 789 790 uvc->desc.fs_control = fs_control; 791 uvc->desc.ss_control = ss_control; 792 uvc->desc.fs_streaming = fs_streaming; 793 uvc->desc.hs_streaming = hs_streaming; 794 uvc->desc.ss_streaming = ss_streaming; 795 796 /* String descriptors are global, we only need to allocate string IDs 797 * for the first UVC function. UVC functions beyond the first (if any) 798 * will reuse the same IDs. 799 */ 800 if (uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id == 0) { 801 ret = usb_string_ids_tab(c->cdev, uvc_en_us_strings); 802 if (ret) 803 goto error; 804 uvc_iad.iFunction = 805 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id; 806 uvc_control_intf.iInterface = 807 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id; 808 ret = uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id; 809 uvc_streaming_intf_alt0.iInterface = ret; 810 uvc_streaming_intf_alt1.iInterface = ret; 811 } 812 813 /* Register the function. */ 814 uvc->func.name = "uvc"; 815 uvc->func.strings = uvc_function_strings; 816 uvc->func.bind = uvc_function_bind; 817 uvc->func.unbind = uvc_function_unbind; 818 uvc->func.get_alt = uvc_function_get_alt; 819 uvc->func.set_alt = uvc_function_set_alt; 820 uvc->func.disable = uvc_function_disable; 821 uvc->func.setup = uvc_function_setup; 822 823 ret = usb_add_function(c, &uvc->func); 824 if (ret) 825 kfree(uvc); 826 827 return ret; 828 829 error: 830 kfree(uvc); 831 return ret; 832 } 833 834 module_param_named(trace, uvc_gadget_trace_param, uint, S_IRUGO|S_IWUSR); 835 MODULE_PARM_DESC(trace, "Trace level bitmask"); 836 837