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/module.h> 15 #include <linux/device.h> 16 #include <linux/errno.h> 17 #include <linux/fs.h> 18 #include <linux/list.h> 19 #include <linux/mutex.h> 20 #include <linux/string.h> 21 #include <linux/usb/ch9.h> 22 #include <linux/usb/gadget.h> 23 #include <linux/usb/video.h> 24 #include <linux/vmalloc.h> 25 #include <linux/wait.h> 26 27 #include <media/v4l2-dev.h> 28 #include <media/v4l2-event.h> 29 30 #include "uvc.h" 31 #include "uvc_v4l2.h" 32 #include "uvc_video.h" 33 #include "u_uvc.h" 34 35 unsigned int uvc_gadget_trace_param; 36 37 /* -------------------------------------------------------------------------- 38 * Function descriptors 39 */ 40 41 /* string IDs are assigned dynamically */ 42 43 #define UVC_STRING_CONTROL_IDX 0 44 #define UVC_STRING_STREAMING_IDX 1 45 46 static struct usb_string uvc_en_us_strings[] = { 47 [UVC_STRING_CONTROL_IDX].s = "UVC Camera", 48 [UVC_STRING_STREAMING_IDX].s = "Video Streaming", 49 { } 50 }; 51 52 static struct usb_gadget_strings uvc_stringtab = { 53 .language = 0x0409, /* en-us */ 54 .strings = uvc_en_us_strings, 55 }; 56 57 static struct usb_gadget_strings *uvc_function_strings[] = { 58 &uvc_stringtab, 59 NULL, 60 }; 61 62 #define UVC_INTF_VIDEO_CONTROL 0 63 #define UVC_INTF_VIDEO_STREAMING 1 64 65 #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */ 66 67 static struct usb_interface_assoc_descriptor uvc_iad = { 68 .bLength = sizeof(uvc_iad), 69 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 70 .bFirstInterface = 0, 71 .bInterfaceCount = 2, 72 .bFunctionClass = USB_CLASS_VIDEO, 73 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION, 74 .bFunctionProtocol = 0x00, 75 .iFunction = 0, 76 }; 77 78 static struct usb_interface_descriptor uvc_control_intf = { 79 .bLength = USB_DT_INTERFACE_SIZE, 80 .bDescriptorType = USB_DT_INTERFACE, 81 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL, 82 .bAlternateSetting = 0, 83 .bNumEndpoints = 1, 84 .bInterfaceClass = USB_CLASS_VIDEO, 85 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL, 86 .bInterfaceProtocol = 0x00, 87 .iInterface = 0, 88 }; 89 90 static struct usb_endpoint_descriptor uvc_control_ep = { 91 .bLength = USB_DT_ENDPOINT_SIZE, 92 .bDescriptorType = USB_DT_ENDPOINT, 93 .bEndpointAddress = USB_DIR_IN, 94 .bmAttributes = USB_ENDPOINT_XFER_INT, 95 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 96 .bInterval = 8, 97 }; 98 99 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = { 100 .bLength = sizeof(uvc_ss_control_comp), 101 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 102 /* The following 3 values can be tweaked if necessary. */ 103 .bMaxBurst = 0, 104 .bmAttributes = 0, 105 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 106 }; 107 108 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = { 109 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE, 110 .bDescriptorType = USB_DT_CS_ENDPOINT, 111 .bDescriptorSubType = UVC_EP_INTERRUPT, 112 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 113 }; 114 115 static struct usb_interface_descriptor uvc_streaming_intf_alt0 = { 116 .bLength = USB_DT_INTERFACE_SIZE, 117 .bDescriptorType = USB_DT_INTERFACE, 118 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 119 .bAlternateSetting = 0, 120 .bNumEndpoints = 0, 121 .bInterfaceClass = USB_CLASS_VIDEO, 122 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 123 .bInterfaceProtocol = 0x00, 124 .iInterface = 0, 125 }; 126 127 static struct usb_interface_descriptor uvc_streaming_intf_alt1 = { 128 .bLength = USB_DT_INTERFACE_SIZE, 129 .bDescriptorType = USB_DT_INTERFACE, 130 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 131 .bAlternateSetting = 1, 132 .bNumEndpoints = 1, 133 .bInterfaceClass = USB_CLASS_VIDEO, 134 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 135 .bInterfaceProtocol = 0x00, 136 .iInterface = 0, 137 }; 138 139 static struct usb_endpoint_descriptor uvc_fs_streaming_ep = { 140 .bLength = USB_DT_ENDPOINT_SIZE, 141 .bDescriptorType = USB_DT_ENDPOINT, 142 .bEndpointAddress = USB_DIR_IN, 143 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 144 | USB_ENDPOINT_XFER_ISOC, 145 /* The wMaxPacketSize and bInterval values will be initialized from 146 * module parameters. 147 */ 148 }; 149 150 static struct usb_endpoint_descriptor uvc_hs_streaming_ep = { 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_ss_streaming_ep = { 162 .bLength = USB_DT_ENDPOINT_SIZE, 163 .bDescriptorType = USB_DT_ENDPOINT, 164 165 .bEndpointAddress = USB_DIR_IN, 166 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 167 | USB_ENDPOINT_XFER_ISOC, 168 /* The wMaxPacketSize and bInterval values will be initialized from 169 * module parameters. 170 */ 171 }; 172 173 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = { 174 .bLength = sizeof(uvc_ss_streaming_comp), 175 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 176 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be 177 * initialized from module parameters. 178 */ 179 }; 180 181 static const struct usb_descriptor_header * const uvc_fs_streaming[] = { 182 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 183 (struct usb_descriptor_header *) &uvc_fs_streaming_ep, 184 NULL, 185 }; 186 187 static const struct usb_descriptor_header * const uvc_hs_streaming[] = { 188 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 189 (struct usb_descriptor_header *) &uvc_hs_streaming_ep, 190 NULL, 191 }; 192 193 static const struct usb_descriptor_header * const uvc_ss_streaming[] = { 194 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 195 (struct usb_descriptor_header *) &uvc_ss_streaming_ep, 196 (struct usb_descriptor_header *) &uvc_ss_streaming_comp, 197 NULL, 198 }; 199 200 void uvc_set_trace_param(unsigned int trace) 201 { 202 uvc_gadget_trace_param = trace; 203 } 204 EXPORT_SYMBOL(uvc_set_trace_param); 205 206 /* -------------------------------------------------------------------------- 207 * Control requests 208 */ 209 210 static void 211 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) 212 { 213 struct uvc_device *uvc = req->context; 214 struct v4l2_event v4l2_event; 215 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 216 217 if (uvc->event_setup_out) { 218 uvc->event_setup_out = 0; 219 220 memset(&v4l2_event, 0, sizeof(v4l2_event)); 221 v4l2_event.type = UVC_EVENT_DATA; 222 uvc_event->data.length = req->actual; 223 memcpy(&uvc_event->data.data, req->buf, req->actual); 224 v4l2_event_queue(uvc->vdev, &v4l2_event); 225 } 226 } 227 228 static int 229 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 230 { 231 struct uvc_device *uvc = to_uvc(f); 232 struct v4l2_event v4l2_event; 233 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 234 235 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n", 236 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue), 237 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength)); 238 */ 239 240 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) { 241 INFO(f->config->cdev, "invalid request type\n"); 242 return -EINVAL; 243 } 244 245 /* Stall too big requests. */ 246 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE) 247 return -EINVAL; 248 249 /* Tell the complete callback to generate an event for the next request 250 * that will be enqueued by UVCIOC_SEND_RESPONSE. 251 */ 252 uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN); 253 uvc->event_length = le16_to_cpu(ctrl->wLength); 254 255 memset(&v4l2_event, 0, sizeof(v4l2_event)); 256 v4l2_event.type = UVC_EVENT_SETUP; 257 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req)); 258 v4l2_event_queue(uvc->vdev, &v4l2_event); 259 260 return 0; 261 } 262 263 void uvc_function_setup_continue(struct uvc_device *uvc) 264 { 265 struct usb_composite_dev *cdev = uvc->func.config->cdev; 266 267 usb_composite_setup_continue(cdev); 268 } 269 270 static int 271 uvc_function_get_alt(struct usb_function *f, unsigned interface) 272 { 273 struct uvc_device *uvc = to_uvc(f); 274 275 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface); 276 277 if (interface == uvc->control_intf) 278 return 0; 279 else if (interface != uvc->streaming_intf) 280 return -EINVAL; 281 else 282 return uvc->state == UVC_STATE_STREAMING ? 1 : 0; 283 } 284 285 static int 286 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt) 287 { 288 struct uvc_device *uvc = to_uvc(f); 289 struct v4l2_event v4l2_event; 290 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 291 int ret; 292 293 INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt); 294 295 if (interface == uvc->control_intf) { 296 if (alt) 297 return -EINVAL; 298 299 if (uvc->state == UVC_STATE_DISCONNECTED) { 300 memset(&v4l2_event, 0, sizeof(v4l2_event)); 301 v4l2_event.type = UVC_EVENT_CONNECT; 302 uvc_event->speed = f->config->cdev->gadget->speed; 303 v4l2_event_queue(uvc->vdev, &v4l2_event); 304 305 uvc->state = UVC_STATE_CONNECTED; 306 } 307 308 return 0; 309 } 310 311 if (interface != uvc->streaming_intf) 312 return -EINVAL; 313 314 /* TODO 315 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep)) 316 return alt ? -EINVAL : 0; 317 */ 318 319 switch (alt) { 320 case 0: 321 if (uvc->state != UVC_STATE_STREAMING) 322 return 0; 323 324 if (uvc->video.ep) 325 usb_ep_disable(uvc->video.ep); 326 327 memset(&v4l2_event, 0, sizeof(v4l2_event)); 328 v4l2_event.type = UVC_EVENT_STREAMOFF; 329 v4l2_event_queue(uvc->vdev, &v4l2_event); 330 331 uvc->state = UVC_STATE_CONNECTED; 332 return 0; 333 334 case 1: 335 if (uvc->state != UVC_STATE_CONNECTED) 336 return 0; 337 338 if (uvc->video.ep) { 339 ret = config_ep_by_speed(f->config->cdev->gadget, 340 &(uvc->func), uvc->video.ep); 341 if (ret) 342 return ret; 343 usb_ep_enable(uvc->video.ep); 344 } 345 346 memset(&v4l2_event, 0, sizeof(v4l2_event)); 347 v4l2_event.type = UVC_EVENT_STREAMON; 348 v4l2_event_queue(uvc->vdev, &v4l2_event); 349 return USB_GADGET_DELAYED_STATUS; 350 351 default: 352 return -EINVAL; 353 } 354 } 355 356 static void 357 uvc_function_disable(struct usb_function *f) 358 { 359 struct uvc_device *uvc = to_uvc(f); 360 struct v4l2_event v4l2_event; 361 362 INFO(f->config->cdev, "uvc_function_disable\n"); 363 364 memset(&v4l2_event, 0, sizeof(v4l2_event)); 365 v4l2_event.type = UVC_EVENT_DISCONNECT; 366 v4l2_event_queue(uvc->vdev, &v4l2_event); 367 368 uvc->state = UVC_STATE_DISCONNECTED; 369 } 370 371 /* -------------------------------------------------------------------------- 372 * Connection / disconnection 373 */ 374 375 void 376 uvc_function_connect(struct uvc_device *uvc) 377 { 378 struct usb_composite_dev *cdev = uvc->func.config->cdev; 379 int ret; 380 381 if ((ret = usb_function_activate(&uvc->func)) < 0) 382 INFO(cdev, "UVC connect failed with %d\n", ret); 383 } 384 385 void 386 uvc_function_disconnect(struct uvc_device *uvc) 387 { 388 struct usb_composite_dev *cdev = uvc->func.config->cdev; 389 int ret; 390 391 if ((ret = usb_function_deactivate(&uvc->func)) < 0) 392 INFO(cdev, "UVC disconnect failed with %d\n", ret); 393 } 394 395 /* -------------------------------------------------------------------------- 396 * USB probe and disconnect 397 */ 398 399 static int 400 uvc_register_video(struct uvc_device *uvc) 401 { 402 struct usb_composite_dev *cdev = uvc->func.config->cdev; 403 struct video_device *video; 404 405 /* TODO reference counting. */ 406 video = video_device_alloc(); 407 if (video == NULL) 408 return -ENOMEM; 409 410 video->v4l2_dev = &uvc->v4l2_dev; 411 video->fops = &uvc_v4l2_fops; 412 video->ioctl_ops = &uvc_v4l2_ioctl_ops; 413 video->release = video_device_release; 414 video->vfl_dir = VFL_DIR_TX; 415 strlcpy(video->name, cdev->gadget->name, sizeof(video->name)); 416 417 uvc->vdev = video; 418 video_set_drvdata(video, uvc); 419 420 return video_register_device(video, VFL_TYPE_GRABBER, -1); 421 } 422 423 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \ 424 do { \ 425 memcpy(mem, desc, (desc)->bLength); \ 426 *(dst)++ = mem; \ 427 mem += (desc)->bLength; \ 428 } while (0); 429 430 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \ 431 do { \ 432 const struct usb_descriptor_header * const *__src; \ 433 for (__src = src; *__src; ++__src) { \ 434 memcpy(mem, *__src, (*__src)->bLength); \ 435 *dst++ = mem; \ 436 mem += (*__src)->bLength; \ 437 } \ 438 } while (0) 439 440 static struct usb_descriptor_header ** 441 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) 442 { 443 struct uvc_input_header_descriptor *uvc_streaming_header; 444 struct uvc_header_descriptor *uvc_control_header; 445 const struct uvc_descriptor_header * const *uvc_control_desc; 446 const struct uvc_descriptor_header * const *uvc_streaming_cls; 447 const struct usb_descriptor_header * const *uvc_streaming_std; 448 const struct usb_descriptor_header * const *src; 449 struct usb_descriptor_header **dst; 450 struct usb_descriptor_header **hdr; 451 unsigned int control_size; 452 unsigned int streaming_size; 453 unsigned int n_desc; 454 unsigned int bytes; 455 void *mem; 456 457 switch (speed) { 458 case USB_SPEED_SUPER: 459 uvc_control_desc = uvc->desc.ss_control; 460 uvc_streaming_cls = uvc->desc.ss_streaming; 461 uvc_streaming_std = uvc_ss_streaming; 462 break; 463 464 case USB_SPEED_HIGH: 465 uvc_control_desc = uvc->desc.fs_control; 466 uvc_streaming_cls = uvc->desc.hs_streaming; 467 uvc_streaming_std = uvc_hs_streaming; 468 break; 469 470 case USB_SPEED_FULL: 471 default: 472 uvc_control_desc = uvc->desc.fs_control; 473 uvc_streaming_cls = uvc->desc.fs_streaming; 474 uvc_streaming_std = uvc_fs_streaming; 475 break; 476 } 477 478 /* Descriptors layout 479 * 480 * uvc_iad 481 * uvc_control_intf 482 * Class-specific UVC control descriptors 483 * uvc_control_ep 484 * uvc_control_cs_ep 485 * uvc_ss_control_comp (for SS only) 486 * uvc_streaming_intf_alt0 487 * Class-specific UVC streaming descriptors 488 * uvc_{fs|hs}_streaming 489 */ 490 491 /* Count descriptors and compute their size. */ 492 control_size = 0; 493 streaming_size = 0; 494 bytes = uvc_iad.bLength + uvc_control_intf.bLength 495 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength 496 + uvc_streaming_intf_alt0.bLength; 497 498 if (speed == USB_SPEED_SUPER) { 499 bytes += uvc_ss_control_comp.bLength; 500 n_desc = 6; 501 } else { 502 n_desc = 5; 503 } 504 505 for (src = (const struct usb_descriptor_header **)uvc_control_desc; 506 *src; ++src) { 507 control_size += (*src)->bLength; 508 bytes += (*src)->bLength; 509 n_desc++; 510 } 511 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; 512 *src; ++src) { 513 streaming_size += (*src)->bLength; 514 bytes += (*src)->bLength; 515 n_desc++; 516 } 517 for (src = uvc_streaming_std; *src; ++src) { 518 bytes += (*src)->bLength; 519 n_desc++; 520 } 521 522 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL); 523 if (mem == NULL) 524 return NULL; 525 526 hdr = mem; 527 dst = mem; 528 mem += (n_desc + 1) * sizeof(*src); 529 530 /* Copy the descriptors. */ 531 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad); 532 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf); 533 534 uvc_control_header = mem; 535 UVC_COPY_DESCRIPTORS(mem, dst, 536 (const struct usb_descriptor_header **)uvc_control_desc); 537 uvc_control_header->wTotalLength = cpu_to_le16(control_size); 538 uvc_control_header->bInCollection = 1; 539 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf; 540 541 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep); 542 if (speed == USB_SPEED_SUPER) 543 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); 544 545 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep); 546 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0); 547 548 uvc_streaming_header = mem; 549 UVC_COPY_DESCRIPTORS(mem, dst, 550 (const struct usb_descriptor_header**)uvc_streaming_cls); 551 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size); 552 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address; 553 554 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std); 555 556 *dst = NULL; 557 return hdr; 558 } 559 560 static int 561 uvc_function_bind(struct usb_configuration *c, struct usb_function *f) 562 { 563 struct usb_composite_dev *cdev = c->cdev; 564 struct uvc_device *uvc = to_uvc(f); 565 struct usb_string *us; 566 unsigned int max_packet_mult; 567 unsigned int max_packet_size; 568 struct usb_ep *ep; 569 struct f_uvc_opts *opts; 570 int ret = -EINVAL; 571 572 INFO(cdev, "uvc_function_bind\n"); 573 574 opts = to_f_uvc_opts(f->fi); 575 /* Sanity check the streaming endpoint module parameters. 576 */ 577 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U); 578 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U); 579 opts->streaming_maxburst = min(opts->streaming_maxburst, 15U); 580 581 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the 582 * module parameters. 583 * 584 * NOTE: We assume that the user knows what they are doing and won't 585 * give parameters that their UDC doesn't support. 586 */ 587 if (opts->streaming_maxpacket <= 1024) { 588 max_packet_mult = 1; 589 max_packet_size = opts->streaming_maxpacket; 590 } else if (opts->streaming_maxpacket <= 2048) { 591 max_packet_mult = 2; 592 max_packet_size = opts->streaming_maxpacket / 2; 593 } else { 594 max_packet_mult = 3; 595 max_packet_size = opts->streaming_maxpacket / 3; 596 } 597 598 uvc_fs_streaming_ep.wMaxPacketSize = 599 cpu_to_le16(min(opts->streaming_maxpacket, 1023U)); 600 uvc_fs_streaming_ep.bInterval = opts->streaming_interval; 601 602 uvc_hs_streaming_ep.wMaxPacketSize = 603 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); 604 uvc_hs_streaming_ep.bInterval = opts->streaming_interval; 605 606 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); 607 uvc_ss_streaming_ep.bInterval = opts->streaming_interval; 608 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; 609 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst; 610 uvc_ss_streaming_comp.wBytesPerInterval = 611 cpu_to_le16(max_packet_size * max_packet_mult * 612 opts->streaming_maxburst); 613 614 /* Allocate endpoints. */ 615 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); 616 if (!ep) { 617 INFO(cdev, "Unable to allocate control EP\n"); 618 goto error; 619 } 620 uvc->control_ep = ep; 621 ep->driver_data = uvc; 622 623 if (gadget_is_superspeed(c->cdev->gadget)) 624 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, 625 &uvc_ss_streaming_comp); 626 else if (gadget_is_dualspeed(cdev->gadget)) 627 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); 628 else 629 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); 630 631 if (!ep) { 632 INFO(cdev, "Unable to allocate streaming EP\n"); 633 goto error; 634 } 635 uvc->video.ep = ep; 636 ep->driver_data = uvc; 637 638 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 639 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 640 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; 641 642 us = usb_gstrings_attach(cdev, uvc_function_strings, 643 ARRAY_SIZE(uvc_en_us_strings)); 644 if (IS_ERR(us)) { 645 ret = PTR_ERR(us); 646 goto error; 647 } 648 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id; 649 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id; 650 ret = us[UVC_STRING_STREAMING_IDX].id; 651 uvc_streaming_intf_alt0.iInterface = ret; 652 uvc_streaming_intf_alt1.iInterface = ret; 653 654 /* Allocate interface IDs. */ 655 if ((ret = usb_interface_id(c, f)) < 0) 656 goto error; 657 uvc_iad.bFirstInterface = ret; 658 uvc_control_intf.bInterfaceNumber = ret; 659 uvc->control_intf = ret; 660 661 if ((ret = usb_interface_id(c, f)) < 0) 662 goto error; 663 uvc_streaming_intf_alt0.bInterfaceNumber = ret; 664 uvc_streaming_intf_alt1.bInterfaceNumber = ret; 665 uvc->streaming_intf = ret; 666 667 /* Copy descriptors */ 668 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); 669 if (gadget_is_dualspeed(cdev->gadget)) 670 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); 671 if (gadget_is_superspeed(c->cdev->gadget)) 672 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); 673 674 /* Preallocate control endpoint request. */ 675 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 676 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL); 677 if (uvc->control_req == NULL || uvc->control_buf == NULL) { 678 ret = -ENOMEM; 679 goto error; 680 } 681 682 uvc->control_req->buf = uvc->control_buf; 683 uvc->control_req->complete = uvc_function_ep0_complete; 684 uvc->control_req->context = uvc; 685 686 /* Avoid letting this gadget enumerate until the userspace server is 687 * active. 688 */ 689 if ((ret = usb_function_deactivate(f)) < 0) 690 goto error; 691 692 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { 693 printk(KERN_INFO "v4l2_device_register failed\n"); 694 goto error; 695 } 696 697 /* Initialise video. */ 698 ret = uvcg_video_init(&uvc->video); 699 if (ret < 0) 700 goto error; 701 702 /* Register a V4L2 device. */ 703 ret = uvc_register_video(uvc); 704 if (ret < 0) { 705 printk(KERN_INFO "Unable to register video device\n"); 706 goto error; 707 } 708 709 return 0; 710 711 error: 712 v4l2_device_unregister(&uvc->v4l2_dev); 713 if (uvc->vdev) 714 video_device_release(uvc->vdev); 715 716 if (uvc->control_ep) 717 uvc->control_ep->driver_data = NULL; 718 if (uvc->video.ep) 719 uvc->video.ep->driver_data = NULL; 720 721 if (uvc->control_req) 722 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 723 kfree(uvc->control_buf); 724 725 usb_free_all_descriptors(f); 726 return ret; 727 } 728 729 /* -------------------------------------------------------------------------- 730 * USB gadget function 731 */ 732 733 static void uvc_free_inst(struct usb_function_instance *f) 734 { 735 struct f_uvc_opts *opts = to_f_uvc_opts(f); 736 737 kfree(opts); 738 } 739 740 static struct usb_function_instance *uvc_alloc_inst(void) 741 { 742 struct f_uvc_opts *opts; 743 744 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 745 if (!opts) 746 return ERR_PTR(-ENOMEM); 747 opts->func_inst.free_func_inst = uvc_free_inst; 748 749 return &opts->func_inst; 750 } 751 752 static void uvc_free(struct usb_function *f) 753 { 754 struct uvc_device *uvc = to_uvc(f); 755 756 kfree(uvc); 757 } 758 759 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f) 760 { 761 struct usb_composite_dev *cdev = c->cdev; 762 struct uvc_device *uvc = to_uvc(f); 763 764 INFO(cdev, "%s\n", __func__); 765 766 video_unregister_device(uvc->vdev); 767 v4l2_device_unregister(&uvc->v4l2_dev); 768 uvc->control_ep->driver_data = NULL; 769 uvc->video.ep->driver_data = NULL; 770 771 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 772 kfree(uvc->control_buf); 773 774 usb_free_all_descriptors(f); 775 } 776 777 static struct usb_function *uvc_alloc(struct usb_function_instance *fi) 778 { 779 struct uvc_device *uvc; 780 struct f_uvc_opts *opts; 781 782 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL); 783 if (uvc == NULL) 784 return ERR_PTR(-ENOMEM); 785 786 uvc->state = UVC_STATE_DISCONNECTED; 787 opts = to_f_uvc_opts(fi); 788 789 uvc->desc.fs_control = opts->fs_control; 790 uvc->desc.ss_control = opts->ss_control; 791 uvc->desc.fs_streaming = opts->fs_streaming; 792 uvc->desc.hs_streaming = opts->hs_streaming; 793 uvc->desc.ss_streaming = opts->ss_streaming; 794 795 /* Register the function. */ 796 uvc->func.name = "uvc"; 797 uvc->func.bind = uvc_function_bind; 798 uvc->func.unbind = uvc_unbind; 799 uvc->func.get_alt = uvc_function_get_alt; 800 uvc->func.set_alt = uvc_function_set_alt; 801 uvc->func.disable = uvc_function_disable; 802 uvc->func.setup = uvc_function_setup; 803 uvc->func.free_func = uvc_free; 804 805 return &uvc->func; 806 } 807 808 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc); 809 MODULE_LICENSE("GPL"); 810 MODULE_AUTHOR("Laurent Pinchart"); 811