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 return 0; 262 } 263 264 void uvc_function_setup_continue(struct uvc_device *uvc) 265 { 266 struct usb_composite_dev *cdev = uvc->func.config->cdev; 267 268 usb_composite_setup_continue(cdev); 269 } 270 271 static int 272 uvc_function_get_alt(struct usb_function *f, unsigned interface) 273 { 274 struct uvc_device *uvc = to_uvc(f); 275 276 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface); 277 278 if (interface == uvc->control_intf) 279 return 0; 280 else if (interface != uvc->streaming_intf) 281 return -EINVAL; 282 else 283 return uvc->video.ep->enabled ? 1 : 0; 284 } 285 286 static int 287 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt) 288 { 289 struct uvc_device *uvc = to_uvc(f); 290 struct usb_composite_dev *cdev = f->config->cdev; 291 struct v4l2_event v4l2_event; 292 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; 293 int ret; 294 295 INFO(cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt); 296 297 if (interface == uvc->control_intf) { 298 if (alt) 299 return -EINVAL; 300 301 INFO(cdev, "reset UVC Control\n"); 302 usb_ep_disable(uvc->control_ep); 303 304 if (!uvc->control_ep->desc) 305 if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep)) 306 return -EINVAL; 307 308 usb_ep_enable(uvc->control_ep); 309 310 if (uvc->state == UVC_STATE_DISCONNECTED) { 311 memset(&v4l2_event, 0, sizeof(v4l2_event)); 312 v4l2_event.type = UVC_EVENT_CONNECT; 313 uvc_event->speed = cdev->gadget->speed; 314 v4l2_event_queue(&uvc->vdev, &v4l2_event); 315 316 uvc->state = UVC_STATE_CONNECTED; 317 } 318 319 return 0; 320 } 321 322 if (interface != uvc->streaming_intf) 323 return -EINVAL; 324 325 /* TODO 326 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep)) 327 return alt ? -EINVAL : 0; 328 */ 329 330 switch (alt) { 331 case 0: 332 if (uvc->state != UVC_STATE_STREAMING) 333 return 0; 334 335 if (uvc->video.ep) 336 usb_ep_disable(uvc->video.ep); 337 338 memset(&v4l2_event, 0, sizeof(v4l2_event)); 339 v4l2_event.type = UVC_EVENT_STREAMOFF; 340 v4l2_event_queue(&uvc->vdev, &v4l2_event); 341 342 uvc->state = UVC_STATE_CONNECTED; 343 return 0; 344 345 case 1: 346 if (uvc->state != UVC_STATE_CONNECTED) 347 return 0; 348 349 if (!uvc->video.ep) 350 return -EINVAL; 351 352 INFO(cdev, "reset UVC\n"); 353 usb_ep_disable(uvc->video.ep); 354 355 ret = config_ep_by_speed(f->config->cdev->gadget, 356 &(uvc->func), uvc->video.ep); 357 if (ret) 358 return ret; 359 usb_ep_enable(uvc->video.ep); 360 361 memset(&v4l2_event, 0, sizeof(v4l2_event)); 362 v4l2_event.type = UVC_EVENT_STREAMON; 363 v4l2_event_queue(&uvc->vdev, &v4l2_event); 364 return USB_GADGET_DELAYED_STATUS; 365 366 default: 367 return -EINVAL; 368 } 369 } 370 371 static void 372 uvc_function_disable(struct usb_function *f) 373 { 374 struct uvc_device *uvc = to_uvc(f); 375 struct v4l2_event v4l2_event; 376 377 INFO(f->config->cdev, "uvc_function_disable\n"); 378 379 memset(&v4l2_event, 0, sizeof(v4l2_event)); 380 v4l2_event.type = UVC_EVENT_DISCONNECT; 381 v4l2_event_queue(&uvc->vdev, &v4l2_event); 382 383 uvc->state = UVC_STATE_DISCONNECTED; 384 385 usb_ep_disable(uvc->video.ep); 386 usb_ep_disable(uvc->control_ep); 387 } 388 389 /* -------------------------------------------------------------------------- 390 * Connection / disconnection 391 */ 392 393 void 394 uvc_function_connect(struct uvc_device *uvc) 395 { 396 struct usb_composite_dev *cdev = uvc->func.config->cdev; 397 int ret; 398 399 if ((ret = usb_function_activate(&uvc->func)) < 0) 400 INFO(cdev, "UVC connect failed with %d\n", ret); 401 } 402 403 void 404 uvc_function_disconnect(struct uvc_device *uvc) 405 { 406 struct usb_composite_dev *cdev = uvc->func.config->cdev; 407 int ret; 408 409 if ((ret = usb_function_deactivate(&uvc->func)) < 0) 410 INFO(cdev, "UVC disconnect failed with %d\n", ret); 411 } 412 413 /* -------------------------------------------------------------------------- 414 * USB probe and disconnect 415 */ 416 417 static int 418 uvc_register_video(struct uvc_device *uvc) 419 { 420 struct usb_composite_dev *cdev = uvc->func.config->cdev; 421 422 /* TODO reference counting. */ 423 uvc->vdev.v4l2_dev = &uvc->v4l2_dev; 424 uvc->vdev.fops = &uvc_v4l2_fops; 425 uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops; 426 uvc->vdev.release = video_device_release_empty; 427 uvc->vdev.vfl_dir = VFL_DIR_TX; 428 uvc->vdev.lock = &uvc->video.mutex; 429 strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name)); 430 431 video_set_drvdata(&uvc->vdev, uvc); 432 433 return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1); 434 } 435 436 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \ 437 do { \ 438 memcpy(mem, desc, (desc)->bLength); \ 439 *(dst)++ = mem; \ 440 mem += (desc)->bLength; \ 441 } while (0); 442 443 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \ 444 do { \ 445 const struct usb_descriptor_header * const *__src; \ 446 for (__src = src; *__src; ++__src) { \ 447 memcpy(mem, *__src, (*__src)->bLength); \ 448 *dst++ = mem; \ 449 mem += (*__src)->bLength; \ 450 } \ 451 } while (0) 452 453 static struct usb_descriptor_header ** 454 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) 455 { 456 struct uvc_input_header_descriptor *uvc_streaming_header; 457 struct uvc_header_descriptor *uvc_control_header; 458 const struct uvc_descriptor_header * const *uvc_control_desc; 459 const struct uvc_descriptor_header * const *uvc_streaming_cls; 460 const struct usb_descriptor_header * const *uvc_streaming_std; 461 const struct usb_descriptor_header * const *src; 462 struct usb_descriptor_header **dst; 463 struct usb_descriptor_header **hdr; 464 unsigned int control_size; 465 unsigned int streaming_size; 466 unsigned int n_desc; 467 unsigned int bytes; 468 void *mem; 469 470 switch (speed) { 471 case USB_SPEED_SUPER: 472 uvc_control_desc = uvc->desc.ss_control; 473 uvc_streaming_cls = uvc->desc.ss_streaming; 474 uvc_streaming_std = uvc_ss_streaming; 475 break; 476 477 case USB_SPEED_HIGH: 478 uvc_control_desc = uvc->desc.fs_control; 479 uvc_streaming_cls = uvc->desc.hs_streaming; 480 uvc_streaming_std = uvc_hs_streaming; 481 break; 482 483 case USB_SPEED_FULL: 484 default: 485 uvc_control_desc = uvc->desc.fs_control; 486 uvc_streaming_cls = uvc->desc.fs_streaming; 487 uvc_streaming_std = uvc_fs_streaming; 488 break; 489 } 490 491 if (!uvc_control_desc || !uvc_streaming_cls) 492 return ERR_PTR(-ENODEV); 493 494 /* Descriptors layout 495 * 496 * uvc_iad 497 * uvc_control_intf 498 * Class-specific UVC control descriptors 499 * uvc_control_ep 500 * uvc_control_cs_ep 501 * uvc_ss_control_comp (for SS only) 502 * uvc_streaming_intf_alt0 503 * Class-specific UVC streaming descriptors 504 * uvc_{fs|hs}_streaming 505 */ 506 507 /* Count descriptors and compute their size. */ 508 control_size = 0; 509 streaming_size = 0; 510 bytes = uvc_iad.bLength + uvc_control_intf.bLength 511 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength 512 + uvc_streaming_intf_alt0.bLength; 513 514 if (speed == USB_SPEED_SUPER) { 515 bytes += uvc_ss_control_comp.bLength; 516 n_desc = 6; 517 } else { 518 n_desc = 5; 519 } 520 521 for (src = (const struct usb_descriptor_header **)uvc_control_desc; 522 *src; ++src) { 523 control_size += (*src)->bLength; 524 bytes += (*src)->bLength; 525 n_desc++; 526 } 527 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; 528 *src; ++src) { 529 streaming_size += (*src)->bLength; 530 bytes += (*src)->bLength; 531 n_desc++; 532 } 533 for (src = uvc_streaming_std; *src; ++src) { 534 bytes += (*src)->bLength; 535 n_desc++; 536 } 537 538 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL); 539 if (mem == NULL) 540 return NULL; 541 542 hdr = mem; 543 dst = mem; 544 mem += (n_desc + 1) * sizeof(*src); 545 546 /* Copy the descriptors. */ 547 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad); 548 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf); 549 550 uvc_control_header = mem; 551 UVC_COPY_DESCRIPTORS(mem, dst, 552 (const struct usb_descriptor_header **)uvc_control_desc); 553 uvc_control_header->wTotalLength = cpu_to_le16(control_size); 554 uvc_control_header->bInCollection = 1; 555 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf; 556 557 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep); 558 if (speed == USB_SPEED_SUPER) 559 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); 560 561 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep); 562 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0); 563 564 uvc_streaming_header = mem; 565 UVC_COPY_DESCRIPTORS(mem, dst, 566 (const struct usb_descriptor_header**)uvc_streaming_cls); 567 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size); 568 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address; 569 570 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std); 571 572 *dst = NULL; 573 return hdr; 574 } 575 576 static int 577 uvc_function_bind(struct usb_configuration *c, struct usb_function *f) 578 { 579 struct usb_composite_dev *cdev = c->cdev; 580 struct uvc_device *uvc = to_uvc(f); 581 struct usb_string *us; 582 unsigned int max_packet_mult; 583 unsigned int max_packet_size; 584 struct usb_ep *ep; 585 struct f_uvc_opts *opts; 586 int ret = -EINVAL; 587 588 INFO(cdev, "uvc_function_bind\n"); 589 590 opts = fi_to_f_uvc_opts(f->fi); 591 /* Sanity check the streaming endpoint module parameters. 592 */ 593 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U); 594 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U); 595 opts->streaming_maxburst = min(opts->streaming_maxburst, 15U); 596 597 /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */ 598 if (opts->streaming_maxburst && 599 (opts->streaming_maxpacket % 1024) != 0) { 600 opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024); 601 INFO(cdev, "overriding streaming_maxpacket to %d\n", 602 opts->streaming_maxpacket); 603 } 604 605 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the 606 * module parameters. 607 * 608 * NOTE: We assume that the user knows what they are doing and won't 609 * give parameters that their UDC doesn't support. 610 */ 611 if (opts->streaming_maxpacket <= 1024) { 612 max_packet_mult = 1; 613 max_packet_size = opts->streaming_maxpacket; 614 } else if (opts->streaming_maxpacket <= 2048) { 615 max_packet_mult = 2; 616 max_packet_size = opts->streaming_maxpacket / 2; 617 } else { 618 max_packet_mult = 3; 619 max_packet_size = opts->streaming_maxpacket / 3; 620 } 621 622 uvc_fs_streaming_ep.wMaxPacketSize = 623 cpu_to_le16(min(opts->streaming_maxpacket, 1023U)); 624 uvc_fs_streaming_ep.bInterval = opts->streaming_interval; 625 626 uvc_hs_streaming_ep.wMaxPacketSize = 627 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); 628 uvc_hs_streaming_ep.bInterval = opts->streaming_interval; 629 630 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); 631 uvc_ss_streaming_ep.bInterval = opts->streaming_interval; 632 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; 633 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst; 634 uvc_ss_streaming_comp.wBytesPerInterval = 635 cpu_to_le16(max_packet_size * max_packet_mult * 636 (opts->streaming_maxburst + 1)); 637 638 /* Allocate endpoints. */ 639 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); 640 if (!ep) { 641 INFO(cdev, "Unable to allocate control EP\n"); 642 goto error; 643 } 644 uvc->control_ep = ep; 645 646 if (gadget_is_superspeed(c->cdev->gadget)) 647 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, 648 &uvc_ss_streaming_comp); 649 else if (gadget_is_dualspeed(cdev->gadget)) 650 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); 651 else 652 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); 653 654 if (!ep) { 655 INFO(cdev, "Unable to allocate streaming EP\n"); 656 goto error; 657 } 658 uvc->video.ep = ep; 659 660 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 661 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; 662 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; 663 664 us = usb_gstrings_attach(cdev, uvc_function_strings, 665 ARRAY_SIZE(uvc_en_us_strings)); 666 if (IS_ERR(us)) { 667 ret = PTR_ERR(us); 668 goto error; 669 } 670 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id; 671 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id; 672 ret = us[UVC_STRING_STREAMING_IDX].id; 673 uvc_streaming_intf_alt0.iInterface = ret; 674 uvc_streaming_intf_alt1.iInterface = ret; 675 676 /* Allocate interface IDs. */ 677 if ((ret = usb_interface_id(c, f)) < 0) 678 goto error; 679 uvc_iad.bFirstInterface = ret; 680 uvc_control_intf.bInterfaceNumber = ret; 681 uvc->control_intf = ret; 682 683 if ((ret = usb_interface_id(c, f)) < 0) 684 goto error; 685 uvc_streaming_intf_alt0.bInterfaceNumber = ret; 686 uvc_streaming_intf_alt1.bInterfaceNumber = ret; 687 uvc->streaming_intf = ret; 688 689 /* Copy descriptors */ 690 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); 691 if (IS_ERR(f->fs_descriptors)) { 692 ret = PTR_ERR(f->fs_descriptors); 693 f->fs_descriptors = NULL; 694 goto error; 695 } 696 if (gadget_is_dualspeed(cdev->gadget)) { 697 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); 698 if (IS_ERR(f->hs_descriptors)) { 699 ret = PTR_ERR(f->hs_descriptors); 700 f->hs_descriptors = NULL; 701 goto error; 702 } 703 } 704 if (gadget_is_superspeed(c->cdev->gadget)) { 705 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); 706 if (IS_ERR(f->ss_descriptors)) { 707 ret = PTR_ERR(f->ss_descriptors); 708 f->ss_descriptors = NULL; 709 goto error; 710 } 711 } 712 713 /* Preallocate control endpoint request. */ 714 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 715 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL); 716 if (uvc->control_req == NULL || uvc->control_buf == NULL) { 717 ret = -ENOMEM; 718 goto error; 719 } 720 721 uvc->control_req->buf = uvc->control_buf; 722 uvc->control_req->complete = uvc_function_ep0_complete; 723 uvc->control_req->context = uvc; 724 725 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { 726 printk(KERN_INFO "v4l2_device_register failed\n"); 727 goto error; 728 } 729 730 /* Initialise video. */ 731 ret = uvcg_video_init(&uvc->video); 732 if (ret < 0) 733 goto error; 734 735 /* Register a V4L2 device. */ 736 ret = uvc_register_video(uvc); 737 if (ret < 0) { 738 printk(KERN_INFO "Unable to register video device\n"); 739 goto error; 740 } 741 742 return 0; 743 744 error: 745 v4l2_device_unregister(&uvc->v4l2_dev); 746 747 if (uvc->control_req) 748 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 749 kfree(uvc->control_buf); 750 751 usb_free_all_descriptors(f); 752 return ret; 753 } 754 755 /* -------------------------------------------------------------------------- 756 * USB gadget function 757 */ 758 759 static void uvc_free_inst(struct usb_function_instance *f) 760 { 761 struct f_uvc_opts *opts = fi_to_f_uvc_opts(f); 762 763 mutex_destroy(&opts->lock); 764 kfree(opts); 765 } 766 767 static struct usb_function_instance *uvc_alloc_inst(void) 768 { 769 struct f_uvc_opts *opts; 770 struct uvc_camera_terminal_descriptor *cd; 771 struct uvc_processing_unit_descriptor *pd; 772 struct uvc_output_terminal_descriptor *od; 773 struct uvc_color_matching_descriptor *md; 774 struct uvc_descriptor_header **ctl_cls; 775 776 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 777 if (!opts) 778 return ERR_PTR(-ENOMEM); 779 opts->func_inst.free_func_inst = uvc_free_inst; 780 mutex_init(&opts->lock); 781 782 cd = &opts->uvc_camera_terminal; 783 cd->bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3); 784 cd->bDescriptorType = USB_DT_CS_INTERFACE; 785 cd->bDescriptorSubType = UVC_VC_INPUT_TERMINAL; 786 cd->bTerminalID = 1; 787 cd->wTerminalType = cpu_to_le16(0x0201); 788 cd->bAssocTerminal = 0; 789 cd->iTerminal = 0; 790 cd->wObjectiveFocalLengthMin = cpu_to_le16(0); 791 cd->wObjectiveFocalLengthMax = cpu_to_le16(0); 792 cd->wOcularFocalLength = cpu_to_le16(0); 793 cd->bControlSize = 3; 794 cd->bmControls[0] = 2; 795 cd->bmControls[1] = 0; 796 cd->bmControls[2] = 0; 797 798 pd = &opts->uvc_processing; 799 pd->bLength = UVC_DT_PROCESSING_UNIT_SIZE(2); 800 pd->bDescriptorType = USB_DT_CS_INTERFACE; 801 pd->bDescriptorSubType = UVC_VC_PROCESSING_UNIT; 802 pd->bUnitID = 2; 803 pd->bSourceID = 1; 804 pd->wMaxMultiplier = cpu_to_le16(16*1024); 805 pd->bControlSize = 2; 806 pd->bmControls[0] = 1; 807 pd->bmControls[1] = 0; 808 pd->iProcessing = 0; 809 810 od = &opts->uvc_output_terminal; 811 od->bLength = UVC_DT_OUTPUT_TERMINAL_SIZE; 812 od->bDescriptorType = USB_DT_CS_INTERFACE; 813 od->bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL; 814 od->bTerminalID = 3; 815 od->wTerminalType = cpu_to_le16(0x0101); 816 od->bAssocTerminal = 0; 817 od->bSourceID = 2; 818 od->iTerminal = 0; 819 820 md = &opts->uvc_color_matching; 821 md->bLength = UVC_DT_COLOR_MATCHING_SIZE; 822 md->bDescriptorType = USB_DT_CS_INTERFACE; 823 md->bDescriptorSubType = UVC_VS_COLORFORMAT; 824 md->bColorPrimaries = 1; 825 md->bTransferCharacteristics = 1; 826 md->bMatrixCoefficients = 4; 827 828 /* Prepare fs control class descriptors for configfs-based gadgets */ 829 ctl_cls = opts->uvc_fs_control_cls; 830 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */ 831 ctl_cls[1] = (struct uvc_descriptor_header *)cd; 832 ctl_cls[2] = (struct uvc_descriptor_header *)pd; 833 ctl_cls[3] = (struct uvc_descriptor_header *)od; 834 ctl_cls[4] = NULL; /* NULL-terminate */ 835 opts->fs_control = 836 (const struct uvc_descriptor_header * const *)ctl_cls; 837 838 /* Prepare hs control class descriptors for configfs-based gadgets */ 839 ctl_cls = opts->uvc_ss_control_cls; 840 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */ 841 ctl_cls[1] = (struct uvc_descriptor_header *)cd; 842 ctl_cls[2] = (struct uvc_descriptor_header *)pd; 843 ctl_cls[3] = (struct uvc_descriptor_header *)od; 844 ctl_cls[4] = NULL; /* NULL-terminate */ 845 opts->ss_control = 846 (const struct uvc_descriptor_header * const *)ctl_cls; 847 848 opts->streaming_interval = 1; 849 opts->streaming_maxpacket = 1024; 850 851 uvcg_attach_configfs(opts); 852 return &opts->func_inst; 853 } 854 855 static void uvc_free(struct usb_function *f) 856 { 857 struct uvc_device *uvc = to_uvc(f); 858 struct f_uvc_opts *opts = container_of(f->fi, struct f_uvc_opts, 859 func_inst); 860 --opts->refcnt; 861 kfree(uvc); 862 } 863 864 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f) 865 { 866 struct usb_composite_dev *cdev = c->cdev; 867 struct uvc_device *uvc = to_uvc(f); 868 869 INFO(cdev, "%s\n", __func__); 870 871 video_unregister_device(&uvc->vdev); 872 v4l2_device_unregister(&uvc->v4l2_dev); 873 874 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); 875 kfree(uvc->control_buf); 876 877 usb_free_all_descriptors(f); 878 } 879 880 static struct usb_function *uvc_alloc(struct usb_function_instance *fi) 881 { 882 struct uvc_device *uvc; 883 struct f_uvc_opts *opts; 884 struct uvc_descriptor_header **strm_cls; 885 886 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL); 887 if (uvc == NULL) 888 return ERR_PTR(-ENOMEM); 889 890 mutex_init(&uvc->video.mutex); 891 uvc->state = UVC_STATE_DISCONNECTED; 892 opts = fi_to_f_uvc_opts(fi); 893 894 mutex_lock(&opts->lock); 895 if (opts->uvc_fs_streaming_cls) { 896 strm_cls = opts->uvc_fs_streaming_cls; 897 opts->fs_streaming = 898 (const struct uvc_descriptor_header * const *)strm_cls; 899 } 900 if (opts->uvc_hs_streaming_cls) { 901 strm_cls = opts->uvc_hs_streaming_cls; 902 opts->hs_streaming = 903 (const struct uvc_descriptor_header * const *)strm_cls; 904 } 905 if (opts->uvc_ss_streaming_cls) { 906 strm_cls = opts->uvc_ss_streaming_cls; 907 opts->ss_streaming = 908 (const struct uvc_descriptor_header * const *)strm_cls; 909 } 910 911 uvc->desc.fs_control = opts->fs_control; 912 uvc->desc.ss_control = opts->ss_control; 913 uvc->desc.fs_streaming = opts->fs_streaming; 914 uvc->desc.hs_streaming = opts->hs_streaming; 915 uvc->desc.ss_streaming = opts->ss_streaming; 916 ++opts->refcnt; 917 mutex_unlock(&opts->lock); 918 919 /* Register the function. */ 920 uvc->func.name = "uvc"; 921 uvc->func.bind = uvc_function_bind; 922 uvc->func.unbind = uvc_unbind; 923 uvc->func.get_alt = uvc_function_get_alt; 924 uvc->func.set_alt = uvc_function_set_alt; 925 uvc->func.disable = uvc_function_disable; 926 uvc->func.setup = uvc_function_setup; 927 uvc->func.free_func = uvc_free; 928 uvc->func.bind_deactivated = true; 929 930 return &uvc->func; 931 } 932 933 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc); 934 MODULE_LICENSE("GPL"); 935 MODULE_AUTHOR("Laurent Pinchart"); 936