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 "u_uvc.h" 31 #include "uvc.h" 32 #include "uvc_configfs.h" 33 #include "uvc_v4l2.h" 34 #include "uvc_video.h" 35 36 unsigned int uvc_gadget_trace_param; 37 38 /* -------------------------------------------------------------------------- 39 * Function descriptors 40 */ 41 42 /* string IDs are assigned dynamically */ 43 44 #define UVC_STRING_CONTROL_IDX 0 45 #define UVC_STRING_STREAMING_IDX 1 46 47 static struct usb_string uvc_en_us_strings[] = { 48 [UVC_STRING_CONTROL_IDX].s = "UVC Camera", 49 [UVC_STRING_STREAMING_IDX].s = "Video Streaming", 50 { } 51 }; 52 53 static struct usb_gadget_strings uvc_stringtab = { 54 .language = 0x0409, /* en-us */ 55 .strings = uvc_en_us_strings, 56 }; 57 58 static struct usb_gadget_strings *uvc_function_strings[] = { 59 &uvc_stringtab, 60 NULL, 61 }; 62 63 #define UVC_INTF_VIDEO_CONTROL 0 64 #define UVC_INTF_VIDEO_STREAMING 1 65 66 #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */ 67 68 static struct usb_interface_assoc_descriptor uvc_iad = { 69 .bLength = sizeof(uvc_iad), 70 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 71 .bFirstInterface = 0, 72 .bInterfaceCount = 2, 73 .bFunctionClass = USB_CLASS_VIDEO, 74 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION, 75 .bFunctionProtocol = 0x00, 76 .iFunction = 0, 77 }; 78 79 static struct usb_interface_descriptor uvc_control_intf = { 80 .bLength = USB_DT_INTERFACE_SIZE, 81 .bDescriptorType = USB_DT_INTERFACE, 82 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL, 83 .bAlternateSetting = 0, 84 .bNumEndpoints = 1, 85 .bInterfaceClass = USB_CLASS_VIDEO, 86 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL, 87 .bInterfaceProtocol = 0x00, 88 .iInterface = 0, 89 }; 90 91 static struct usb_endpoint_descriptor uvc_control_ep = { 92 .bLength = USB_DT_ENDPOINT_SIZE, 93 .bDescriptorType = USB_DT_ENDPOINT, 94 .bEndpointAddress = USB_DIR_IN, 95 .bmAttributes = USB_ENDPOINT_XFER_INT, 96 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 97 .bInterval = 8, 98 }; 99 100 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = { 101 .bLength = sizeof(uvc_ss_control_comp), 102 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 103 /* The following 3 values can be tweaked if necessary. */ 104 .bMaxBurst = 0, 105 .bmAttributes = 0, 106 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 107 }; 108 109 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = { 110 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE, 111 .bDescriptorType = USB_DT_CS_ENDPOINT, 112 .bDescriptorSubType = UVC_EP_INTERRUPT, 113 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), 114 }; 115 116 static struct usb_interface_descriptor uvc_streaming_intf_alt0 = { 117 .bLength = USB_DT_INTERFACE_SIZE, 118 .bDescriptorType = USB_DT_INTERFACE, 119 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 120 .bAlternateSetting = 0, 121 .bNumEndpoints = 0, 122 .bInterfaceClass = USB_CLASS_VIDEO, 123 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 124 .bInterfaceProtocol = 0x00, 125 .iInterface = 0, 126 }; 127 128 static struct usb_interface_descriptor uvc_streaming_intf_alt1 = { 129 .bLength = USB_DT_INTERFACE_SIZE, 130 .bDescriptorType = USB_DT_INTERFACE, 131 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING, 132 .bAlternateSetting = 1, 133 .bNumEndpoints = 1, 134 .bInterfaceClass = USB_CLASS_VIDEO, 135 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING, 136 .bInterfaceProtocol = 0x00, 137 .iInterface = 0, 138 }; 139 140 static struct usb_endpoint_descriptor uvc_fs_streaming_ep = { 141 .bLength = USB_DT_ENDPOINT_SIZE, 142 .bDescriptorType = USB_DT_ENDPOINT, 143 .bEndpointAddress = USB_DIR_IN, 144 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 145 | USB_ENDPOINT_XFER_ISOC, 146 /* The wMaxPacketSize and bInterval values will be initialized from 147 * module parameters. 148 */ 149 }; 150 151 static struct usb_endpoint_descriptor uvc_hs_streaming_ep = { 152 .bLength = USB_DT_ENDPOINT_SIZE, 153 .bDescriptorType = USB_DT_ENDPOINT, 154 .bEndpointAddress = USB_DIR_IN, 155 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 156 | USB_ENDPOINT_XFER_ISOC, 157 /* The wMaxPacketSize and bInterval values will be initialized from 158 * module parameters. 159 */ 160 }; 161 162 static struct usb_endpoint_descriptor uvc_ss_streaming_ep = { 163 .bLength = USB_DT_ENDPOINT_SIZE, 164 .bDescriptorType = USB_DT_ENDPOINT, 165 166 .bEndpointAddress = USB_DIR_IN, 167 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 168 | USB_ENDPOINT_XFER_ISOC, 169 /* The wMaxPacketSize and bInterval values will be initialized from 170 * module parameters. 171 */ 172 }; 173 174 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = { 175 .bLength = sizeof(uvc_ss_streaming_comp), 176 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 177 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be 178 * initialized from module parameters. 179 */ 180 }; 181 182 static const struct usb_descriptor_header * const uvc_fs_streaming[] = { 183 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 184 (struct usb_descriptor_header *) &uvc_fs_streaming_ep, 185 NULL, 186 }; 187 188 static const struct usb_descriptor_header * const uvc_hs_streaming[] = { 189 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 190 (struct usb_descriptor_header *) &uvc_hs_streaming_ep, 191 NULL, 192 }; 193 194 static const struct usb_descriptor_header * const uvc_ss_streaming[] = { 195 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, 196 (struct usb_descriptor_header *) &uvc_ss_streaming_ep, 197 (struct usb_descriptor_header *) &uvc_ss_streaming_comp, 198 NULL, 199 }; 200 201 void uvc_set_trace_param(unsigned int trace) 202 { 203 uvc_gadget_trace_param = trace; 204 } 205 EXPORT_SYMBOL(uvc_set_trace_param); 206 207 /* -------------------------------------------------------------------------- 208 * Control requests 209 */ 210 211 static void 212 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) 213 { 214 struct uvc_device *uvc = req->context; 215 struct v4l2_event v4l2_event; 216 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 217 218 if (uvc->event_setup_out) { 219 uvc->event_setup_out = 0; 220 221 memset(&v4l2_event, 0, sizeof(v4l2_event)); 222 v4l2_event.type = UVC_EVENT_DATA; 223 uvc_event->data.length = req->actual; 224 memcpy(&uvc_event->data.data, req->buf, req->actual); 225 v4l2_event_queue(&uvc->vdev, &v4l2_event); 226 } 227 } 228 229 static int 230 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 231 { 232 struct uvc_device *uvc = to_uvc(f); 233 struct v4l2_event v4l2_event; 234 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 235 236 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n", 237 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue), 238 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength)); 239 */ 240 241 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) { 242 INFO(f->config->cdev, "invalid request type\n"); 243 return -EINVAL; 244 } 245 246 /* Stall too big requests. */ 247 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE) 248 return -EINVAL; 249 250 /* Tell the complete callback to generate an event for the next request 251 * that will be enqueued by UVCIOC_SEND_RESPONSE. 252 */ 253 uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN); 254 uvc->event_length = le16_to_cpu(ctrl->wLength); 255 256 memset(&v4l2_event, 0, sizeof(v4l2_event)); 257 v4l2_event.type = UVC_EVENT_SETUP; 258 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req)); 259 v4l2_event_queue(&uvc->vdev, &v4l2_event); 260 261 /* Pass additional setup data to userspace */ 262 if (uvc->event_setup_out && uvc->event_length) { 263 uvc->control_req->length = uvc->event_length; 264 return usb_ep_queue(uvc->func.config->cdev->gadget->ep0, 265 uvc->control_req, GFP_ATOMIC); 266 } 267 268 return 0; 269 } 270 271 void uvc_function_setup_continue(struct uvc_device *uvc) 272 { 273 struct usb_composite_dev *cdev = uvc->func.config->cdev; 274 275 usb_composite_setup_continue(cdev); 276 } 277 278 static int 279 uvc_function_get_alt(struct usb_function *f, unsigned interface) 280 { 281 struct uvc_device *uvc = to_uvc(f); 282 283 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface); 284 285 if (interface == uvc->control_intf) 286 return 0; 287 else if (interface != uvc->streaming_intf) 288 return -EINVAL; 289 else 290 return uvc->video.ep->enabled ? 1 : 0; 291 } 292 293 static int 294 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt) 295 { 296 struct uvc_device *uvc = to_uvc(f); 297 struct usb_composite_dev *cdev = f->config->cdev; 298 struct v4l2_event v4l2_event; 299 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 300 int ret; 301 302 INFO(cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt); 303 304 if (interface == uvc->control_intf) { 305 if (alt) 306 return -EINVAL; 307 308 INFO(cdev, "reset UVC Control\n"); 309 usb_ep_disable(uvc->control_ep); 310 311 if (!uvc->control_ep->desc) 312 if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep)) 313 return -EINVAL; 314 315 usb_ep_enable(uvc->control_ep); 316 317 if (uvc->state == UVC_STATE_DISCONNECTED) { 318 memset(&v4l2_event, 0, sizeof(v4l2_event)); 319 v4l2_event.type = UVC_EVENT_CONNECT; 320 uvc_event->speed = cdev->gadget->speed; 321 v4l2_event_queue(&uvc->vdev, &v4l2_event); 322 323 uvc->state = UVC_STATE_CONNECTED; 324 } 325 326 return 0; 327 } 328 329 if (interface != uvc->streaming_intf) 330 return -EINVAL; 331 332 /* TODO 333 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep)) 334 return alt ? -EINVAL : 0; 335 */ 336 337 switch (alt) { 338 case 0: 339 if (uvc->state != UVC_STATE_STREAMING) 340 return 0; 341 342 if (uvc->video.ep) 343 usb_ep_disable(uvc->video.ep); 344 345 memset(&v4l2_event, 0, sizeof(v4l2_event)); 346 v4l2_event.type = UVC_EVENT_STREAMOFF; 347 v4l2_event_queue(&uvc->vdev, &v4l2_event); 348 349 uvc->state = UVC_STATE_CONNECTED; 350 return 0; 351 352 case 1: 353 if (uvc->state != UVC_STATE_CONNECTED) 354 return 0; 355 356 if (!uvc->video.ep) 357 return -EINVAL; 358 359 INFO(cdev, "reset UVC\n"); 360 usb_ep_disable(uvc->video.ep); 361 362 ret = config_ep_by_speed(f->config->cdev->gadget, 363 &(uvc->func), uvc->video.ep); 364 if (ret) 365 return ret; 366 usb_ep_enable(uvc->video.ep); 367 368 memset(&v4l2_event, 0, sizeof(v4l2_event)); 369 v4l2_event.type = UVC_EVENT_STREAMON; 370 v4l2_event_queue(&uvc->vdev, &v4l2_event); 371 return USB_GADGET_DELAYED_STATUS; 372 373 default: 374 return -EINVAL; 375 } 376 } 377 378 static void 379 uvc_function_disable(struct usb_function *f) 380 { 381 struct uvc_device *uvc = to_uvc(f); 382 struct v4l2_event v4l2_event; 383 384 INFO(f->config->cdev, "uvc_function_disable\n"); 385 386 memset(&v4l2_event, 0, sizeof(v4l2_event)); 387 v4l2_event.type = UVC_EVENT_DISCONNECT; 388 v4l2_event_queue(&uvc->vdev, &v4l2_event); 389 390 uvc->state = UVC_STATE_DISCONNECTED; 391 392 usb_ep_disable(uvc->video.ep); 393 usb_ep_disable(uvc->control_ep); 394 } 395 396 /* -------------------------------------------------------------------------- 397 * Connection / disconnection 398 */ 399 400 void 401 uvc_function_connect(struct uvc_device *uvc) 402 { 403 struct usb_composite_dev *cdev = uvc->func.config->cdev; 404 int ret; 405 406 if ((ret = usb_function_activate(&uvc->func)) < 0) 407 INFO(cdev, "UVC connect failed with %d\n", ret); 408 } 409 410 void 411 uvc_function_disconnect(struct uvc_device *uvc) 412 { 413 struct usb_composite_dev *cdev = uvc->func.config->cdev; 414 int ret; 415 416 if ((ret = usb_function_deactivate(&uvc->func)) < 0) 417 INFO(cdev, "UVC disconnect failed with %d\n", ret); 418 } 419 420 /* -------------------------------------------------------------------------- 421 * USB probe and disconnect 422 */ 423 424 static int 425 uvc_register_video(struct uvc_device *uvc) 426 { 427 struct usb_composite_dev *cdev = uvc->func.config->cdev; 428 429 /* TODO reference counting. */ 430 uvc->vdev.v4l2_dev = &uvc->v4l2_dev; 431 uvc->vdev.fops = &uvc_v4l2_fops; 432 uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops; 433 uvc->vdev.release = video_device_release_empty; 434 uvc->vdev.vfl_dir = VFL_DIR_TX; 435 uvc->vdev.lock = &uvc->video.mutex; 436 strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name)); 437 438 video_set_drvdata(&uvc->vdev, uvc); 439 440 return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1); 441 } 442 443 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \ 444 do { \ 445 memcpy(mem, desc, (desc)->bLength); \ 446 *(dst)++ = mem; \ 447 mem += (desc)->bLength; \ 448 } while (0); 449 450 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \ 451 do { \ 452 const struct usb_descriptor_header * const *__src; \ 453 for (__src = src; *__src; ++__src) { \ 454 memcpy(mem, *__src, (*__src)->bLength); \ 455 *dst++ = mem; \ 456 mem += (*__src)->bLength; \ 457 } \ 458 } while (0) 459 460 static struct usb_descriptor_header ** 461 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) 462 { 463 struct uvc_input_header_descriptor *uvc_streaming_header; 464 struct uvc_header_descriptor *uvc_control_header; 465 const struct uvc_descriptor_header * const *uvc_control_desc; 466 const struct uvc_descriptor_header * const *uvc_streaming_cls; 467 const struct usb_descriptor_header * const *uvc_streaming_std; 468 const struct usb_descriptor_header * const *src; 469 struct usb_descriptor_header **dst; 470 struct usb_descriptor_header **hdr; 471 unsigned int control_size; 472 unsigned int streaming_size; 473 unsigned int n_desc; 474 unsigned int bytes; 475 void *mem; 476 477 switch (speed) { 478 case USB_SPEED_SUPER: 479 uvc_control_desc = uvc->desc.ss_control; 480 uvc_streaming_cls = uvc->desc.ss_streaming; 481 uvc_streaming_std = uvc_ss_streaming; 482 break; 483 484 case USB_SPEED_HIGH: 485 uvc_control_desc = uvc->desc.fs_control; 486 uvc_streaming_cls = uvc->desc.hs_streaming; 487 uvc_streaming_std = uvc_hs_streaming; 488 break; 489 490 case USB_SPEED_FULL: 491 default: 492 uvc_control_desc = uvc->desc.fs_control; 493 uvc_streaming_cls = uvc->desc.fs_streaming; 494 uvc_streaming_std = uvc_fs_streaming; 495 break; 496 } 497 498 if (!uvc_control_desc || !uvc_streaming_cls) 499 return ERR_PTR(-ENODEV); 500 501 /* Descriptors layout 502 * 503 * uvc_iad 504 * uvc_control_intf 505 * Class-specific UVC control descriptors 506 * uvc_control_ep 507 * uvc_control_cs_ep 508 * uvc_ss_control_comp (for SS only) 509 * uvc_streaming_intf_alt0 510 * Class-specific UVC streaming descriptors 511 * uvc_{fs|hs}_streaming 512 */ 513 514 /* Count descriptors and compute their size. */ 515 control_size = 0; 516 streaming_size = 0; 517 bytes = uvc_iad.bLength + uvc_control_intf.bLength 518 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength 519 + uvc_streaming_intf_alt0.bLength; 520 521 if (speed == USB_SPEED_SUPER) { 522 bytes += uvc_ss_control_comp.bLength; 523 n_desc = 6; 524 } else { 525 n_desc = 5; 526 } 527 528 for (src = (const struct usb_descriptor_header **)uvc_control_desc; 529 *src; ++src) { 530 control_size += (*src)->bLength; 531 bytes += (*src)->bLength; 532 n_desc++; 533 } 534 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; 535 *src; ++src) { 536 streaming_size += (*src)->bLength; 537 bytes += (*src)->bLength; 538 n_desc++; 539 } 540 for (src = uvc_streaming_std; *src; ++src) { 541 bytes += (*src)->bLength; 542 n_desc++; 543 } 544 545 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL); 546 if (mem == NULL) 547 return NULL; 548 549 hdr = mem; 550 dst = mem; 551 mem += (n_desc + 1) * sizeof(*src); 552 553 /* Copy the descriptors. */ 554 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad); 555 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf); 556 557 uvc_control_header = mem; 558 UVC_COPY_DESCRIPTORS(mem, dst, 559 (const struct usb_descriptor_header **)uvc_control_desc); 560 uvc_control_header->wTotalLength = cpu_to_le16(control_size); 561 uvc_control_header->bInCollection = 1; 562 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf; 563 564 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep); 565 if (speed == USB_SPEED_SUPER) 566 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); 567 568 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep); 569 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0); 570 571 uvc_streaming_header = mem; 572 UVC_COPY_DESCRIPTORS(mem, dst, 573 (const struct usb_descriptor_header**)uvc_streaming_cls); 574 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size); 575 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address; 576 577 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std); 578 579 *dst = NULL; 580 return hdr; 581 } 582 583 static int 584 uvc_function_bind(struct usb_configuration *c, struct usb_function *f) 585 { 586 struct usb_composite_dev *cdev = c->cdev; 587 struct uvc_device *uvc = to_uvc(f); 588 struct usb_string *us; 589 unsigned int max_packet_mult; 590 unsigned int max_packet_size; 591 struct usb_ep *ep; 592 struct f_uvc_opts *opts; 593 int ret = -EINVAL; 594 595 INFO(cdev, "uvc_function_bind\n"); 596 597 opts = fi_to_f_uvc_opts(f->fi); 598 /* Sanity check the streaming endpoint module parameters. 599 */ 600 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U); 601 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U); 602 opts->streaming_maxburst = min(opts->streaming_maxburst, 15U); 603 604 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the 605 * module parameters. 606 * 607 * NOTE: We assume that the user knows what they are doing and won't 608 * give parameters that their UDC doesn't support. 609 */ 610 if (opts->streaming_maxpacket <= 1024) { 611 max_packet_mult = 1; 612 max_packet_size = opts->streaming_maxpacket; 613 } else if (opts->streaming_maxpacket <= 2048) { 614 max_packet_mult = 2; 615 max_packet_size = opts->streaming_maxpacket / 2; 616 } else { 617 max_packet_mult = 3; 618 max_packet_size = opts->streaming_maxpacket / 3; 619 } 620 621 uvc_fs_streaming_ep.wMaxPacketSize = 622 cpu_to_le16(min(opts->streaming_maxpacket, 1023U)); 623 uvc_fs_streaming_ep.bInterval = opts->streaming_interval; 624 625 uvc_hs_streaming_ep.wMaxPacketSize = 626 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); 627 uvc_hs_streaming_ep.bInterval = opts->streaming_interval; 628 629 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); 630 uvc_ss_streaming_ep.bInterval = opts->streaming_interval; 631 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; 632 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst; 633 uvc_ss_streaming_comp.wBytesPerInterval = 634 cpu_to_le16(max_packet_size * max_packet_mult * 635 opts->streaming_maxburst); 636 637 /* Allocate endpoints. */ 638 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); 639 if (!ep) { 640 INFO(cdev, "Unable to allocate control EP\n"); 641 goto error; 642 } 643 uvc->control_ep = ep; 644 645 if (gadget_is_superspeed(c->cdev->gadget)) 646 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, 647 &uvc_ss_streaming_comp); 648 else if (gadget_is_dualspeed(cdev->gadget)) 649 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); 650 else 651 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); 652 653 if (!ep) { 654 INFO(cdev, "Unable to allocate streaming EP\n"); 655 goto error; 656 } 657 uvc->video.ep = ep; 658 659 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 660 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 661 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; 662 663 us = usb_gstrings_attach(cdev, uvc_function_strings, 664 ARRAY_SIZE(uvc_en_us_strings)); 665 if (IS_ERR(us)) { 666 ret = PTR_ERR(us); 667 goto error; 668 } 669 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id; 670 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id; 671 ret = us[UVC_STRING_STREAMING_IDX].id; 672 uvc_streaming_intf_alt0.iInterface = ret; 673 uvc_streaming_intf_alt1.iInterface = ret; 674 675 /* Allocate interface IDs. */ 676 if ((ret = usb_interface_id(c, f)) < 0) 677 goto error; 678 uvc_iad.bFirstInterface = ret; 679 uvc_control_intf.bInterfaceNumber = ret; 680 uvc->control_intf = ret; 681 682 if ((ret = usb_interface_id(c, f)) < 0) 683 goto error; 684 uvc_streaming_intf_alt0.bInterfaceNumber = ret; 685 uvc_streaming_intf_alt1.bInterfaceNumber = ret; 686 uvc->streaming_intf = ret; 687 688 /* Copy descriptors */ 689 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); 690 if (IS_ERR(f->fs_descriptors)) { 691 ret = PTR_ERR(f->fs_descriptors); 692 f->fs_descriptors = NULL; 693 goto error; 694 } 695 if (gadget_is_dualspeed(cdev->gadget)) { 696 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); 697 if (IS_ERR(f->hs_descriptors)) { 698 ret = PTR_ERR(f->hs_descriptors); 699 f->hs_descriptors = NULL; 700 goto error; 701 } 702 } 703 if (gadget_is_superspeed(c->cdev->gadget)) { 704 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); 705 if (IS_ERR(f->ss_descriptors)) { 706 ret = PTR_ERR(f->ss_descriptors); 707 f->ss_descriptors = NULL; 708 goto error; 709 } 710 } 711 712 /* Preallocate control endpoint request. */ 713 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 714 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL); 715 if (uvc->control_req == NULL || uvc->control_buf == NULL) { 716 ret = -ENOMEM; 717 goto error; 718 } 719 720 uvc->control_req->buf = uvc->control_buf; 721 uvc->control_req->complete = uvc_function_ep0_complete; 722 uvc->control_req->context = uvc; 723 724 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { 725 printk(KERN_INFO "v4l2_device_register failed\n"); 726 goto error; 727 } 728 729 /* Initialise video. */ 730 ret = uvcg_video_init(&uvc->video); 731 if (ret < 0) 732 goto error; 733 734 /* Register a V4L2 device. */ 735 ret = uvc_register_video(uvc); 736 if (ret < 0) { 737 printk(KERN_INFO "Unable to register video device\n"); 738 goto error; 739 } 740 741 return 0; 742 743 error: 744 v4l2_device_unregister(&uvc->v4l2_dev); 745 746 if (uvc->control_req) 747 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 748 kfree(uvc->control_buf); 749 750 usb_free_all_descriptors(f); 751 return ret; 752 } 753 754 /* -------------------------------------------------------------------------- 755 * USB gadget function 756 */ 757 758 static void uvc_free_inst(struct usb_function_instance *f) 759 { 760 struct f_uvc_opts *opts = fi_to_f_uvc_opts(f); 761 762 mutex_destroy(&opts->lock); 763 kfree(opts); 764 } 765 766 static struct usb_function_instance *uvc_alloc_inst(void) 767 { 768 struct f_uvc_opts *opts; 769 struct uvc_camera_terminal_descriptor *cd; 770 struct uvc_processing_unit_descriptor *pd; 771 struct uvc_output_terminal_descriptor *od; 772 struct uvc_color_matching_descriptor *md; 773 struct uvc_descriptor_header **ctl_cls; 774 775 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 776 if (!opts) 777 return ERR_PTR(-ENOMEM); 778 opts->func_inst.free_func_inst = uvc_free_inst; 779 mutex_init(&opts->lock); 780 781 cd = &opts->uvc_camera_terminal; 782 cd->bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3); 783 cd->bDescriptorType = USB_DT_CS_INTERFACE; 784 cd->bDescriptorSubType = UVC_VC_INPUT_TERMINAL; 785 cd->bTerminalID = 1; 786 cd->wTerminalType = cpu_to_le16(0x0201); 787 cd->bAssocTerminal = 0; 788 cd->iTerminal = 0; 789 cd->wObjectiveFocalLengthMin = cpu_to_le16(0); 790 cd->wObjectiveFocalLengthMax = cpu_to_le16(0); 791 cd->wOcularFocalLength = cpu_to_le16(0); 792 cd->bControlSize = 3; 793 cd->bmControls[0] = 2; 794 cd->bmControls[1] = 0; 795 cd->bmControls[2] = 0; 796 797 pd = &opts->uvc_processing; 798 pd->bLength = UVC_DT_PROCESSING_UNIT_SIZE(2); 799 pd->bDescriptorType = USB_DT_CS_INTERFACE; 800 pd->bDescriptorSubType = UVC_VC_PROCESSING_UNIT; 801 pd->bUnitID = 2; 802 pd->bSourceID = 1; 803 pd->wMaxMultiplier = cpu_to_le16(16*1024); 804 pd->bControlSize = 2; 805 pd->bmControls[0] = 1; 806 pd->bmControls[1] = 0; 807 pd->iProcessing = 0; 808 809 od = &opts->uvc_output_terminal; 810 od->bLength = UVC_DT_OUTPUT_TERMINAL_SIZE; 811 od->bDescriptorType = USB_DT_CS_INTERFACE; 812 od->bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL; 813 od->bTerminalID = 3; 814 od->wTerminalType = cpu_to_le16(0x0101); 815 od->bAssocTerminal = 0; 816 od->bSourceID = 2; 817 od->iTerminal = 0; 818 819 md = &opts->uvc_color_matching; 820 md->bLength = UVC_DT_COLOR_MATCHING_SIZE; 821 md->bDescriptorType = USB_DT_CS_INTERFACE; 822 md->bDescriptorSubType = UVC_VS_COLORFORMAT; 823 md->bColorPrimaries = 1; 824 md->bTransferCharacteristics = 1; 825 md->bMatrixCoefficients = 4; 826 827 /* Prepare fs control class descriptors for configfs-based gadgets */ 828 ctl_cls = opts->uvc_fs_control_cls; 829 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */ 830 ctl_cls[1] = (struct uvc_descriptor_header *)cd; 831 ctl_cls[2] = (struct uvc_descriptor_header *)pd; 832 ctl_cls[3] = (struct uvc_descriptor_header *)od; 833 ctl_cls[4] = NULL; /* NULL-terminate */ 834 opts->fs_control = 835 (const struct uvc_descriptor_header * const *)ctl_cls; 836 837 /* Prepare hs control class descriptors for configfs-based gadgets */ 838 ctl_cls = opts->uvc_ss_control_cls; 839 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */ 840 ctl_cls[1] = (struct uvc_descriptor_header *)cd; 841 ctl_cls[2] = (struct uvc_descriptor_header *)pd; 842 ctl_cls[3] = (struct uvc_descriptor_header *)od; 843 ctl_cls[4] = NULL; /* NULL-terminate */ 844 opts->ss_control = 845 (const struct uvc_descriptor_header * const *)ctl_cls; 846 847 opts->streaming_interval = 1; 848 opts->streaming_maxpacket = 1024; 849 850 uvcg_attach_configfs(opts); 851 return &opts->func_inst; 852 } 853 854 static void uvc_free(struct usb_function *f) 855 { 856 struct uvc_device *uvc = to_uvc(f); 857 struct f_uvc_opts *opts = container_of(f->fi, struct f_uvc_opts, 858 func_inst); 859 --opts->refcnt; 860 kfree(uvc); 861 } 862 863 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f) 864 { 865 struct usb_composite_dev *cdev = c->cdev; 866 struct uvc_device *uvc = to_uvc(f); 867 868 INFO(cdev, "%s\n", __func__); 869 870 video_unregister_device(&uvc->vdev); 871 v4l2_device_unregister(&uvc->v4l2_dev); 872 873 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 874 kfree(uvc->control_buf); 875 876 usb_free_all_descriptors(f); 877 } 878 879 static struct usb_function *uvc_alloc(struct usb_function_instance *fi) 880 { 881 struct uvc_device *uvc; 882 struct f_uvc_opts *opts; 883 struct uvc_descriptor_header **strm_cls; 884 885 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL); 886 if (uvc == NULL) 887 return ERR_PTR(-ENOMEM); 888 889 mutex_init(&uvc->video.mutex); 890 uvc->state = UVC_STATE_DISCONNECTED; 891 opts = fi_to_f_uvc_opts(fi); 892 893 mutex_lock(&opts->lock); 894 if (opts->uvc_fs_streaming_cls) { 895 strm_cls = opts->uvc_fs_streaming_cls; 896 opts->fs_streaming = 897 (const struct uvc_descriptor_header * const *)strm_cls; 898 } 899 if (opts->uvc_hs_streaming_cls) { 900 strm_cls = opts->uvc_hs_streaming_cls; 901 opts->hs_streaming = 902 (const struct uvc_descriptor_header * const *)strm_cls; 903 } 904 if (opts->uvc_ss_streaming_cls) { 905 strm_cls = opts->uvc_ss_streaming_cls; 906 opts->ss_streaming = 907 (const struct uvc_descriptor_header * const *)strm_cls; 908 } 909 910 uvc->desc.fs_control = opts->fs_control; 911 uvc->desc.ss_control = opts->ss_control; 912 uvc->desc.fs_streaming = opts->fs_streaming; 913 uvc->desc.hs_streaming = opts->hs_streaming; 914 uvc->desc.ss_streaming = opts->ss_streaming; 915 ++opts->refcnt; 916 mutex_unlock(&opts->lock); 917 918 /* Register the function. */ 919 uvc->func.name = "uvc"; 920 uvc->func.bind = uvc_function_bind; 921 uvc->func.unbind = uvc_unbind; 922 uvc->func.get_alt = uvc_function_get_alt; 923 uvc->func.set_alt = uvc_function_set_alt; 924 uvc->func.disable = uvc_function_disable; 925 uvc->func.setup = uvc_function_setup; 926 uvc->func.free_func = uvc_free; 927 uvc->func.bind_deactivated = true; 928 929 return &uvc->func; 930 } 931 932 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc); 933 MODULE_LICENSE("GPL"); 934 MODULE_AUTHOR("Laurent Pinchart"); 935