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->video.ep->driver_data ? 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 usb_composite_dev *cdev = f->config->cdev; 290 struct v4l2_event v4l2_event; 291 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 292 int ret; 293 294 INFO(cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt); 295 296 if (interface == uvc->control_intf) { 297 if (alt) 298 return -EINVAL; 299 300 if (uvc->control_ep->driver_data) { 301 INFO(cdev, "reset UVC Control\n"); 302 usb_ep_disable(uvc->control_ep); 303 uvc->control_ep->driver_data = NULL; 304 } 305 306 if (!uvc->control_ep->desc) 307 if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep)) 308 return -EINVAL; 309 310 usb_ep_enable(uvc->control_ep); 311 uvc->control_ep->driver_data = uvc; 312 313 if (uvc->state == UVC_STATE_DISCONNECTED) { 314 memset(&v4l2_event, 0, sizeof(v4l2_event)); 315 v4l2_event.type = UVC_EVENT_CONNECT; 316 uvc_event->speed = cdev->gadget->speed; 317 v4l2_event_queue(uvc->vdev, &v4l2_event); 318 319 uvc->state = UVC_STATE_CONNECTED; 320 } 321 322 return 0; 323 } 324 325 if (interface != uvc->streaming_intf) 326 return -EINVAL; 327 328 /* TODO 329 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep)) 330 return alt ? -EINVAL : 0; 331 */ 332 333 switch (alt) { 334 case 0: 335 if (uvc->state != UVC_STATE_STREAMING) 336 return 0; 337 338 if (uvc->video.ep) { 339 usb_ep_disable(uvc->video.ep); 340 uvc->video.ep->driver_data = NULL; 341 } 342 343 memset(&v4l2_event, 0, sizeof(v4l2_event)); 344 v4l2_event.type = UVC_EVENT_STREAMOFF; 345 v4l2_event_queue(uvc->vdev, &v4l2_event); 346 347 uvc->state = UVC_STATE_CONNECTED; 348 return 0; 349 350 case 1: 351 if (uvc->state != UVC_STATE_CONNECTED) 352 return 0; 353 354 if (!uvc->video.ep) 355 return -EINVAL; 356 357 if (uvc->video.ep->driver_data) { 358 INFO(cdev, "reset UVC\n"); 359 usb_ep_disable(uvc->video.ep); 360 uvc->video.ep->driver_data = NULL; 361 } 362 363 ret = config_ep_by_speed(f->config->cdev->gadget, 364 &(uvc->func), uvc->video.ep); 365 if (ret) 366 return ret; 367 usb_ep_enable(uvc->video.ep); 368 uvc->video.ep->driver_data = uvc; 369 370 memset(&v4l2_event, 0, sizeof(v4l2_event)); 371 v4l2_event.type = UVC_EVENT_STREAMON; 372 v4l2_event_queue(uvc->vdev, &v4l2_event); 373 return USB_GADGET_DELAYED_STATUS; 374 375 default: 376 return -EINVAL; 377 } 378 } 379 380 static void 381 uvc_function_disable(struct usb_function *f) 382 { 383 struct uvc_device *uvc = to_uvc(f); 384 struct v4l2_event v4l2_event; 385 386 INFO(f->config->cdev, "uvc_function_disable\n"); 387 388 memset(&v4l2_event, 0, sizeof(v4l2_event)); 389 v4l2_event.type = UVC_EVENT_DISCONNECT; 390 v4l2_event_queue(uvc->vdev, &v4l2_event); 391 392 uvc->state = UVC_STATE_DISCONNECTED; 393 394 if (uvc->video.ep->driver_data) { 395 usb_ep_disable(uvc->video.ep); 396 uvc->video.ep->driver_data = NULL; 397 } 398 399 if (uvc->control_ep->driver_data) { 400 usb_ep_disable(uvc->control_ep); 401 uvc->control_ep->driver_data = NULL; 402 } 403 } 404 405 /* -------------------------------------------------------------------------- 406 * Connection / disconnection 407 */ 408 409 void 410 uvc_function_connect(struct uvc_device *uvc) 411 { 412 struct usb_composite_dev *cdev = uvc->func.config->cdev; 413 int ret; 414 415 if ((ret = usb_function_activate(&uvc->func)) < 0) 416 INFO(cdev, "UVC connect failed with %d\n", ret); 417 } 418 419 void 420 uvc_function_disconnect(struct uvc_device *uvc) 421 { 422 struct usb_composite_dev *cdev = uvc->func.config->cdev; 423 int ret; 424 425 if ((ret = usb_function_deactivate(&uvc->func)) < 0) 426 INFO(cdev, "UVC disconnect failed with %d\n", ret); 427 } 428 429 /* -------------------------------------------------------------------------- 430 * USB probe and disconnect 431 */ 432 433 static int 434 uvc_register_video(struct uvc_device *uvc) 435 { 436 struct usb_composite_dev *cdev = uvc->func.config->cdev; 437 struct video_device *video; 438 439 /* TODO reference counting. */ 440 video = video_device_alloc(); 441 if (video == NULL) 442 return -ENOMEM; 443 444 video->v4l2_dev = &uvc->v4l2_dev; 445 video->fops = &uvc_v4l2_fops; 446 video->ioctl_ops = &uvc_v4l2_ioctl_ops; 447 video->release = video_device_release; 448 video->vfl_dir = VFL_DIR_TX; 449 strlcpy(video->name, cdev->gadget->name, sizeof(video->name)); 450 451 uvc->vdev = video; 452 video_set_drvdata(video, uvc); 453 454 return video_register_device(video, VFL_TYPE_GRABBER, -1); 455 } 456 457 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \ 458 do { \ 459 memcpy(mem, desc, (desc)->bLength); \ 460 *(dst)++ = mem; \ 461 mem += (desc)->bLength; \ 462 } while (0); 463 464 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \ 465 do { \ 466 const struct usb_descriptor_header * const *__src; \ 467 for (__src = src; *__src; ++__src) { \ 468 memcpy(mem, *__src, (*__src)->bLength); \ 469 *dst++ = mem; \ 470 mem += (*__src)->bLength; \ 471 } \ 472 } while (0) 473 474 static struct usb_descriptor_header ** 475 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) 476 { 477 struct uvc_input_header_descriptor *uvc_streaming_header; 478 struct uvc_header_descriptor *uvc_control_header; 479 const struct uvc_descriptor_header * const *uvc_control_desc; 480 const struct uvc_descriptor_header * const *uvc_streaming_cls; 481 const struct usb_descriptor_header * const *uvc_streaming_std; 482 const struct usb_descriptor_header * const *src; 483 struct usb_descriptor_header **dst; 484 struct usb_descriptor_header **hdr; 485 unsigned int control_size; 486 unsigned int streaming_size; 487 unsigned int n_desc; 488 unsigned int bytes; 489 void *mem; 490 491 switch (speed) { 492 case USB_SPEED_SUPER: 493 uvc_control_desc = uvc->desc.ss_control; 494 uvc_streaming_cls = uvc->desc.ss_streaming; 495 uvc_streaming_std = uvc_ss_streaming; 496 break; 497 498 case USB_SPEED_HIGH: 499 uvc_control_desc = uvc->desc.fs_control; 500 uvc_streaming_cls = uvc->desc.hs_streaming; 501 uvc_streaming_std = uvc_hs_streaming; 502 break; 503 504 case USB_SPEED_FULL: 505 default: 506 uvc_control_desc = uvc->desc.fs_control; 507 uvc_streaming_cls = uvc->desc.fs_streaming; 508 uvc_streaming_std = uvc_fs_streaming; 509 break; 510 } 511 512 /* Descriptors layout 513 * 514 * uvc_iad 515 * uvc_control_intf 516 * Class-specific UVC control descriptors 517 * uvc_control_ep 518 * uvc_control_cs_ep 519 * uvc_ss_control_comp (for SS only) 520 * uvc_streaming_intf_alt0 521 * Class-specific UVC streaming descriptors 522 * uvc_{fs|hs}_streaming 523 */ 524 525 /* Count descriptors and compute their size. */ 526 control_size = 0; 527 streaming_size = 0; 528 bytes = uvc_iad.bLength + uvc_control_intf.bLength 529 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength 530 + uvc_streaming_intf_alt0.bLength; 531 532 if (speed == USB_SPEED_SUPER) { 533 bytes += uvc_ss_control_comp.bLength; 534 n_desc = 6; 535 } else { 536 n_desc = 5; 537 } 538 539 for (src = (const struct usb_descriptor_header **)uvc_control_desc; 540 *src; ++src) { 541 control_size += (*src)->bLength; 542 bytes += (*src)->bLength; 543 n_desc++; 544 } 545 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; 546 *src; ++src) { 547 streaming_size += (*src)->bLength; 548 bytes += (*src)->bLength; 549 n_desc++; 550 } 551 for (src = uvc_streaming_std; *src; ++src) { 552 bytes += (*src)->bLength; 553 n_desc++; 554 } 555 556 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL); 557 if (mem == NULL) 558 return NULL; 559 560 hdr = mem; 561 dst = mem; 562 mem += (n_desc + 1) * sizeof(*src); 563 564 /* Copy the descriptors. */ 565 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad); 566 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf); 567 568 uvc_control_header = mem; 569 UVC_COPY_DESCRIPTORS(mem, dst, 570 (const struct usb_descriptor_header **)uvc_control_desc); 571 uvc_control_header->wTotalLength = cpu_to_le16(control_size); 572 uvc_control_header->bInCollection = 1; 573 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf; 574 575 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep); 576 if (speed == USB_SPEED_SUPER) 577 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); 578 579 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep); 580 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0); 581 582 uvc_streaming_header = mem; 583 UVC_COPY_DESCRIPTORS(mem, dst, 584 (const struct usb_descriptor_header**)uvc_streaming_cls); 585 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size); 586 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address; 587 588 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std); 589 590 *dst = NULL; 591 return hdr; 592 } 593 594 static int 595 uvc_function_bind(struct usb_configuration *c, struct usb_function *f) 596 { 597 struct usb_composite_dev *cdev = c->cdev; 598 struct uvc_device *uvc = to_uvc(f); 599 struct usb_string *us; 600 unsigned int max_packet_mult; 601 unsigned int max_packet_size; 602 struct usb_ep *ep; 603 struct f_uvc_opts *opts; 604 int ret = -EINVAL; 605 606 INFO(cdev, "uvc_function_bind\n"); 607 608 opts = to_f_uvc_opts(f->fi); 609 /* Sanity check the streaming endpoint module parameters. 610 */ 611 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U); 612 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U); 613 opts->streaming_maxburst = min(opts->streaming_maxburst, 15U); 614 615 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the 616 * module parameters. 617 * 618 * NOTE: We assume that the user knows what they are doing and won't 619 * give parameters that their UDC doesn't support. 620 */ 621 if (opts->streaming_maxpacket <= 1024) { 622 max_packet_mult = 1; 623 max_packet_size = opts->streaming_maxpacket; 624 } else if (opts->streaming_maxpacket <= 2048) { 625 max_packet_mult = 2; 626 max_packet_size = opts->streaming_maxpacket / 2; 627 } else { 628 max_packet_mult = 3; 629 max_packet_size = opts->streaming_maxpacket / 3; 630 } 631 632 uvc_fs_streaming_ep.wMaxPacketSize = 633 cpu_to_le16(min(opts->streaming_maxpacket, 1023U)); 634 uvc_fs_streaming_ep.bInterval = opts->streaming_interval; 635 636 uvc_hs_streaming_ep.wMaxPacketSize = 637 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); 638 uvc_hs_streaming_ep.bInterval = opts->streaming_interval; 639 640 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); 641 uvc_ss_streaming_ep.bInterval = opts->streaming_interval; 642 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; 643 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst; 644 uvc_ss_streaming_comp.wBytesPerInterval = 645 cpu_to_le16(max_packet_size * max_packet_mult * 646 opts->streaming_maxburst); 647 648 /* Allocate endpoints. */ 649 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); 650 if (!ep) { 651 INFO(cdev, "Unable to allocate control EP\n"); 652 goto error; 653 } 654 uvc->control_ep = ep; 655 ep->driver_data = uvc; 656 657 if (gadget_is_superspeed(c->cdev->gadget)) 658 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, 659 &uvc_ss_streaming_comp); 660 else if (gadget_is_dualspeed(cdev->gadget)) 661 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); 662 else 663 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); 664 665 if (!ep) { 666 INFO(cdev, "Unable to allocate streaming EP\n"); 667 goto error; 668 } 669 uvc->video.ep = ep; 670 ep->driver_data = uvc; 671 672 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 673 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 674 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; 675 676 us = usb_gstrings_attach(cdev, uvc_function_strings, 677 ARRAY_SIZE(uvc_en_us_strings)); 678 if (IS_ERR(us)) { 679 ret = PTR_ERR(us); 680 goto error; 681 } 682 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id; 683 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id; 684 ret = us[UVC_STRING_STREAMING_IDX].id; 685 uvc_streaming_intf_alt0.iInterface = ret; 686 uvc_streaming_intf_alt1.iInterface = ret; 687 688 /* Allocate interface IDs. */ 689 if ((ret = usb_interface_id(c, f)) < 0) 690 goto error; 691 uvc_iad.bFirstInterface = ret; 692 uvc_control_intf.bInterfaceNumber = ret; 693 uvc->control_intf = ret; 694 695 if ((ret = usb_interface_id(c, f)) < 0) 696 goto error; 697 uvc_streaming_intf_alt0.bInterfaceNumber = ret; 698 uvc_streaming_intf_alt1.bInterfaceNumber = ret; 699 uvc->streaming_intf = ret; 700 701 /* Copy descriptors */ 702 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); 703 if (gadget_is_dualspeed(cdev->gadget)) 704 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); 705 if (gadget_is_superspeed(c->cdev->gadget)) 706 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); 707 708 /* Preallocate control endpoint request. */ 709 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 710 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL); 711 if (uvc->control_req == NULL || uvc->control_buf == NULL) { 712 ret = -ENOMEM; 713 goto error; 714 } 715 716 uvc->control_req->buf = uvc->control_buf; 717 uvc->control_req->complete = uvc_function_ep0_complete; 718 uvc->control_req->context = uvc; 719 720 /* Avoid letting this gadget enumerate until the userspace server is 721 * active. 722 */ 723 if ((ret = usb_function_deactivate(f)) < 0) 724 goto error; 725 726 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { 727 printk(KERN_INFO "v4l2_device_register failed\n"); 728 goto error; 729 } 730 731 /* Initialise video. */ 732 ret = uvcg_video_init(&uvc->video); 733 if (ret < 0) 734 goto error; 735 736 /* Register a V4L2 device. */ 737 ret = uvc_register_video(uvc); 738 if (ret < 0) { 739 printk(KERN_INFO "Unable to register video device\n"); 740 goto error; 741 } 742 743 return 0; 744 745 error: 746 v4l2_device_unregister(&uvc->v4l2_dev); 747 if (uvc->vdev) 748 video_device_release(uvc->vdev); 749 750 if (uvc->control_ep) 751 uvc->control_ep->driver_data = NULL; 752 if (uvc->video.ep) 753 uvc->video.ep->driver_data = NULL; 754 755 if (uvc->control_req) 756 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 757 kfree(uvc->control_buf); 758 759 usb_free_all_descriptors(f); 760 return ret; 761 } 762 763 /* -------------------------------------------------------------------------- 764 * USB gadget function 765 */ 766 767 static void uvc_free_inst(struct usb_function_instance *f) 768 { 769 struct f_uvc_opts *opts = to_f_uvc_opts(f); 770 771 kfree(opts); 772 } 773 774 static struct usb_function_instance *uvc_alloc_inst(void) 775 { 776 struct f_uvc_opts *opts; 777 778 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 779 if (!opts) 780 return ERR_PTR(-ENOMEM); 781 opts->func_inst.free_func_inst = uvc_free_inst; 782 783 return &opts->func_inst; 784 } 785 786 static void uvc_free(struct usb_function *f) 787 { 788 struct uvc_device *uvc = to_uvc(f); 789 790 kfree(uvc); 791 } 792 793 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f) 794 { 795 struct usb_composite_dev *cdev = c->cdev; 796 struct uvc_device *uvc = to_uvc(f); 797 798 INFO(cdev, "%s\n", __func__); 799 800 video_unregister_device(uvc->vdev); 801 v4l2_device_unregister(&uvc->v4l2_dev); 802 uvc->control_ep->driver_data = NULL; 803 uvc->video.ep->driver_data = NULL; 804 805 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 806 kfree(uvc->control_buf); 807 808 usb_free_all_descriptors(f); 809 } 810 811 static struct usb_function *uvc_alloc(struct usb_function_instance *fi) 812 { 813 struct uvc_device *uvc; 814 struct f_uvc_opts *opts; 815 816 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL); 817 if (uvc == NULL) 818 return ERR_PTR(-ENOMEM); 819 820 uvc->state = UVC_STATE_DISCONNECTED; 821 opts = to_f_uvc_opts(fi); 822 823 uvc->desc.fs_control = opts->fs_control; 824 uvc->desc.ss_control = opts->ss_control; 825 uvc->desc.fs_streaming = opts->fs_streaming; 826 uvc->desc.hs_streaming = opts->hs_streaming; 827 uvc->desc.ss_streaming = opts->ss_streaming; 828 829 /* Register the function. */ 830 uvc->func.name = "uvc"; 831 uvc->func.bind = uvc_function_bind; 832 uvc->func.unbind = uvc_unbind; 833 uvc->func.get_alt = uvc_function_get_alt; 834 uvc->func.set_alt = uvc_function_set_alt; 835 uvc->func.disable = uvc_function_disable; 836 uvc->func.setup = uvc_function_setup; 837 uvc->func.free_func = uvc_free; 838 839 return &uvc->func; 840 } 841 842 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc); 843 MODULE_LICENSE("GPL"); 844 MODULE_AUTHOR("Laurent Pinchart"); 845