drivers/usb/gadget/f_uvc.c

   1 /*
   2  *      uvc_gadget.c  --  USB Video Class Gadget driver
   3  *
   4  *      Copyright (C) 2009-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/fs.h>
  17 #include <linux/list.h>
  18 #include <linux/mutex.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/usb/video.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/wait.h>
  24
  25 #include <media/v4l2-dev.h>
  26 #include <media/v4l2-event.h>
  27
  28 #include "uvc.h"
  29
  30 unsigned int uvc_gadget_trace_param;
  31
  32 /*-------------------------------------------------------------------------*/
  33
  34 /* module parameters specific to the Video streaming endpoint */
  35 static unsigned streaming_interval = 1;
  36 module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
  37 MODULE_PARM_DESC(streaming_interval, "1 - 16");
  38
  39 static unsigned streaming_maxpacket = 1024;
  40 module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
  41 MODULE_PARM_DESC(streaming_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
  42
  43 static unsigned streaming_mult;
  44 module_param(streaming_mult, uint, S_IRUGO|S_IWUSR);
  45 MODULE_PARM_DESC(streaming_mult, "0 - 2 (hs/ss only)");
  46
  47 static unsigned streaming_maxburst;
  48 module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
  49 MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
  50
  51 /* --------------------------------------------------------------------------
  52  * Function descriptors
  53  */
  54
  55 /* string IDs are assigned dynamically */
  56
  57 #define UVC_STRING_ASSOCIATION_IDX              0
  58 #define UVC_STRING_CONTROL_IDX                  1
  59 #define UVC_STRING_STREAMING_IDX                2
  60
  61 static struct usb_string uvc_en_us_strings[] = {
  62         [UVC_STRING_ASSOCIATION_IDX].s = "UVC Camera",
  63         [UVC_STRING_CONTROL_IDX].s = "Video Control",
  64         [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
  65         {  }
  66 };
  67
  68 static struct usb_gadget_strings uvc_stringtab = {
  69         .language = 0x0409,     /* en-us */
  70         .strings = uvc_en_us_strings,
  71 };
  72
  73 static struct usb_gadget_strings *uvc_function_strings[] = {
  74         &uvc_stringtab,
  75         NULL,
  76 };
  77
  78 #define UVC_INTF_VIDEO_CONTROL                  0
  79 #define UVC_INTF_VIDEO_STREAMING                1
  80
  81 #define STATUS_BYTECOUNT                        16      /* 16 bytes status */
  82
  83 static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
  84         .bLength                = sizeof(uvc_iad),
  85         .bDescriptorType        = USB_DT_INTERFACE_ASSOCIATION,
  86         .bFirstInterface        = 0,
  87         .bInterfaceCount        = 2,
  88         .bFunctionClass         = USB_CLASS_VIDEO,
  89         .bFunctionSubClass      = UVC_SC_VIDEO_INTERFACE_COLLECTION,
  90         .bFunctionProtocol      = 0x00,
  91         .iFunction              = 0,
  92 };
  93
  94 static struct usb_interface_descriptor uvc_control_intf __initdata = {
  95         .bLength                = USB_DT_INTERFACE_SIZE,
  96         .bDescriptorType        = USB_DT_INTERFACE,
  97         .bInterfaceNumber       = UVC_INTF_VIDEO_CONTROL,
  98         .bAlternateSetting      = 0,
  99         .bNumEndpoints          = 1,
 100         .bInterfaceClass        = USB_CLASS_VIDEO,
 101         .bInterfaceSubClass     = UVC_SC_VIDEOCONTROL,
 102         .bInterfaceProtocol     = 0x00,
 103         .iInterface             = 0,
 104 };
 105
 106 static struct usb_endpoint_descriptor uvc_fs_control_ep __initdata = {
 107         .bLength                = USB_DT_ENDPOINT_SIZE,
 108         .bDescriptorType        = USB_DT_ENDPOINT,
 109         .bEndpointAddress       = USB_DIR_IN,
 110         .bmAttributes           = USB_ENDPOINT_XFER_INT,
 111         .wMaxPacketSize         = cpu_to_le16(STATUS_BYTECOUNT),
 112         .bInterval              = 8,
 113 };
 114
 115 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
 116         .bLength                = UVC_DT_CONTROL_ENDPOINT_SIZE,
 117         .bDescriptorType        = USB_DT_CS_ENDPOINT,
 118         .bDescriptorSubType     = UVC_EP_INTERRUPT,
 119         .wMaxTransferSize       = cpu_to_le16(STATUS_BYTECOUNT),
 120 };
 121
 122 static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
 123         .bLength                = USB_DT_INTERFACE_SIZE,
 124         .bDescriptorType        = USB_DT_INTERFACE,
 125         .bInterfaceNumber       = UVC_INTF_VIDEO_STREAMING,
 126         .bAlternateSetting      = 0,
 127         .bNumEndpoints          = 0,
 128         .bInterfaceClass        = USB_CLASS_VIDEO,
 129         .bInterfaceSubClass     = UVC_SC_VIDEOSTREAMING,
 130         .bInterfaceProtocol     = 0x00,
 131         .iInterface             = 0,
 132 };
 133
 134 static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
 135         .bLength                = USB_DT_INTERFACE_SIZE,
 136         .bDescriptorType        = USB_DT_INTERFACE,
 137         .bInterfaceNumber       = UVC_INTF_VIDEO_STREAMING,
 138         .bAlternateSetting      = 1,
 139         .bNumEndpoints          = 1,
 140         .bInterfaceClass        = USB_CLASS_VIDEO,
 141         .bInterfaceSubClass     = UVC_SC_VIDEOSTREAMING,
 142         .bInterfaceProtocol     = 0x00,
 143         .iInterface             = 0,
 144 };
 145
 146 static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
 147         .bLength                = USB_DT_ENDPOINT_SIZE,
 148         .bDescriptorType        = USB_DT_ENDPOINT,
 149         .bEndpointAddress       = USB_DIR_IN,
 150         .bmAttributes           = USB_ENDPOINT_XFER_ISOC,
 151         .wMaxPacketSize         = cpu_to_le16(512),
 152         .bInterval              = 1,
 153 };
 154
 155 static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
 156         .bLength                = USB_DT_ENDPOINT_SIZE,
 157         .bDescriptorType        = USB_DT_ENDPOINT,
 158         .bEndpointAddress       = USB_DIR_IN,
 159         .bmAttributes           = USB_ENDPOINT_XFER_ISOC,
 160         .wMaxPacketSize         = cpu_to_le16(1024),
 161         .bInterval              = 1,
 162 };
 163
 164 /* super speed support */
 165 static struct usb_endpoint_descriptor uvc_ss_control_ep __initdata = {
 166         .bLength =              USB_DT_ENDPOINT_SIZE,
 167         .bDescriptorType =      USB_DT_ENDPOINT,
 168
 169         .bEndpointAddress =     USB_DIR_IN,
 170         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 171         .wMaxPacketSize =       cpu_to_le16(STATUS_BYTECOUNT),
 172         .bInterval =            8,
 173 };
 174
 175 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp __initdata = {
 176         .bLength =              sizeof uvc_ss_control_comp,
 177         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
 178
 179         /* the following 3 values can be tweaked if necessary */
 180         /* .bMaxBurst =         0, */
 181         /* .bmAttributes =      0, */
 182         .wBytesPerInterval =    cpu_to_le16(STATUS_BYTECOUNT),
 183 };
 184
 185 static struct usb_endpoint_descriptor uvc_ss_streaming_ep __initdata = {
 186         .bLength =              USB_DT_ENDPOINT_SIZE,
 187         .bDescriptorType =      USB_DT_ENDPOINT,
 188
 189         .bEndpointAddress =     USB_DIR_IN,
 190         .bmAttributes =         USB_ENDPOINT_XFER_ISOC,
 191         .wMaxPacketSize =       cpu_to_le16(1024),
 192         .bInterval =            4,
 193 };
 194
 195 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
 196         .bLength =              sizeof uvc_ss_streaming_comp,
 197         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
 198
 199         /* the following 3 values can be tweaked if necessary */
 200         .bMaxBurst =            0,
 201         .bmAttributes = 0,
 202         .wBytesPerInterval =    cpu_to_le16(1024),
 203 };
 204
 205 static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
 206         (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
 207         (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
 208         NULL,
 209 };
 210
 211 static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
 212         (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
 213         (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
 214         NULL,
 215 };
 216
 217 static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
 218         (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
 219         (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
 220         (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
 221         NULL,
 222 };
 223
 224 /* --------------------------------------------------------------------------
 225  * Control requests
 226  */
 227
 228 static void
 229 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
 230 {
 231         struct uvc_device *uvc = req->context;
 232         struct v4l2_event v4l2_event;
 233         struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
 234
 235         if (uvc->event_setup_out) {
 236                 uvc->event_setup_out = 0;
 237
 238                 memset(&v4l2_event, 0, sizeof(v4l2_event));
 239                 v4l2_event.type = UVC_EVENT_DATA;
 240                 uvc_event->data.length = req->actual;
 241                 memcpy(&uvc_event->data.data, req->buf, req->actual);
 242                 v4l2_event_queue(uvc->vdev, &v4l2_event);
 243         }
 244 }
 245
 246 static int
 247 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 248 {
 249         struct uvc_device *uvc = to_uvc(f);
 250         struct v4l2_event v4l2_event;
 251         struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
 252
 253         /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
 254          *      ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
 255          *      le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
 256          */
 257
 258         if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
 259                 INFO(f->config->cdev, "invalid request type\n");
 260                 return -EINVAL;
 261         }
 262
 263         /* Stall too big requests. */
 264         if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
 265                 return -EINVAL;
 266
 267         memset(&v4l2_event, 0, sizeof(v4l2_event));
 268         v4l2_event.type = UVC_EVENT_SETUP;
 269         memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
 270         v4l2_event_queue(uvc->vdev, &v4l2_event);
 271
 272         return 0;
 273 }
 274
 275 static int
 276 uvc_function_get_alt(struct usb_function *f, unsigned interface)
 277 {
 278         struct uvc_device *uvc = to_uvc(f);
 279
 280         INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
 281
 282         if (interface == uvc->control_intf)
 283                 return 0;
 284         else if (interface != uvc->streaming_intf)
 285                 return -EINVAL;
 286         else
 287                 return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
 288 }
 289
 290 static int
 291 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
 292 {
 293         struct uvc_device *uvc = to_uvc(f);
 294         struct v4l2_event v4l2_event;
 295         struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
 296         int ret;
 297
 298         INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
 299
 300         if (interface == uvc->control_intf) {
 301                 if (alt)
 302                         return -EINVAL;
 303
 304                 if (uvc->state == UVC_STATE_DISCONNECTED) {
 305                         memset(&v4l2_event, 0, sizeof(v4l2_event));
 306                         v4l2_event.type = UVC_EVENT_CONNECT;
 307                         uvc_event->speed = f->config->cdev->gadget->speed;
 308                         v4l2_event_queue(uvc->vdev, &v4l2_event);
 309
 310                         uvc->state = UVC_STATE_CONNECTED;
 311                 }
 312
 313                 return 0;
 314         }
 315
 316         if (interface != uvc->streaming_intf)
 317                 return -EINVAL;
 318
 319         /* TODO
 320         if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
 321                 return alt ? -EINVAL : 0;
 322         */
 323
 324         switch (alt) {
 325         case 0:
 326                 if (uvc->state != UVC_STATE_STREAMING)
 327                         return 0;
 328
 329                 if (uvc->video.ep)
 330                         usb_ep_disable(uvc->video.ep);
 331
 332                 memset(&v4l2_event, 0, sizeof(v4l2_event));
 333                 v4l2_event.type = UVC_EVENT_STREAMOFF;
 334                 v4l2_event_queue(uvc->vdev, &v4l2_event);
 335
 336                 uvc->state = UVC_STATE_CONNECTED;
 337                 break;
 338
 339         case 1:
 340                 if (uvc->state != UVC_STATE_CONNECTED)
 341                         return 0;
 342
 343                 if (uvc->video.ep) {
 344                         ret = config_ep_by_speed(f->config->cdev->gadget,
 345                                         &(uvc->func), uvc->video.ep);
 346                         if (ret)
 347                                 return ret;
 348                         usb_ep_enable(uvc->video.ep);
 349                 }
 350
 351                 memset(&v4l2_event, 0, sizeof(v4l2_event));
 352                 v4l2_event.type = UVC_EVENT_STREAMON;
 353                 v4l2_event_queue(uvc->vdev, &v4l2_event);
 354
 355                 uvc->state = UVC_STATE_STREAMING;
 356                 break;
 357
 358         default:
 359                 return -EINVAL;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static void
 366 uvc_function_disable(struct usb_function *f)
 367 {
 368         struct uvc_device *uvc = to_uvc(f);
 369         struct v4l2_event v4l2_event;
 370
 371         INFO(f->config->cdev, "uvc_function_disable\n");
 372
 373         memset(&v4l2_event, 0, sizeof(v4l2_event));
 374         v4l2_event.type = UVC_EVENT_DISCONNECT;
 375         v4l2_event_queue(uvc->vdev, &v4l2_event);
 376
 377         uvc->state = UVC_STATE_DISCONNECTED;
 378 }
 379
 380 /* --------------------------------------------------------------------------
 381  * Connection / disconnection
 382  */
 383
 384 void
 385 uvc_function_connect(struct uvc_device *uvc)
 386 {
 387         struct usb_composite_dev *cdev = uvc->func.config->cdev;
 388         int ret;
 389
 390         if ((ret = usb_function_activate(&uvc->func)) < 0)
 391                 INFO(cdev, "UVC connect failed with %d\n", ret);
 392 }
 393
 394 void
 395 uvc_function_disconnect(struct uvc_device *uvc)
 396 {
 397         struct usb_composite_dev *cdev = uvc->func.config->cdev;
 398         int ret;
 399
 400         if ((ret = usb_function_deactivate(&uvc->func)) < 0)
 401                 INFO(cdev, "UVC disconnect failed with %d\n", ret);
 402 }
 403
 404 /* --------------------------------------------------------------------------
 405  * USB probe and disconnect
 406  */
 407
 408 static int
 409 uvc_register_video(struct uvc_device *uvc)
 410 {
 411         struct usb_composite_dev *cdev = uvc->func.config->cdev;
 412         struct video_device *video;
 413
 414         /* TODO reference counting. */
 415         video = video_device_alloc();
 416         if (video == NULL)
 417                 return -ENOMEM;
 418
 419         video->parent = &cdev->gadget->dev;
 420         video->fops = &uvc_v4l2_fops;
 421         video->release = video_device_release;
 422         strncpy(video->name, cdev->gadget->name, sizeof(video->name));
 423
 424         uvc->vdev = video;
 425         video_set_drvdata(video, uvc);
 426
 427         return video_register_device(video, VFL_TYPE_GRABBER, -1);
 428 }
 429
 430 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
 431         do { \
 432                 memcpy(mem, desc, (desc)->bLength); \
 433                 *(dst)++ = mem; \
 434                 mem += (desc)->bLength; \
 435         } while (0);
 436
 437 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \
 438         do { \
 439                 const struct usb_descriptor_header * const *__src; \
 440                 for (__src = src; *__src; ++__src) { \
 441                         memcpy(mem, *__src, (*__src)->bLength); \
 442                         *dst++ = mem; \
 443                         mem += (*__src)->bLength; \
 444                 } \
 445         } while (0)
 446
 447 static struct usb_descriptor_header ** __init
 448 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 449 {
 450         struct uvc_input_header_descriptor *uvc_streaming_header;
 451         struct uvc_header_descriptor *uvc_control_header;
 452         const struct uvc_descriptor_header * const *uvc_control_desc;
 453         const struct uvc_descriptor_header * const *uvc_streaming_cls;
 454         const struct usb_descriptor_header * const *uvc_streaming_std;
 455         const struct usb_descriptor_header * const *src;
 456         static struct usb_endpoint_descriptor *uvc_control_ep;
 457         struct usb_descriptor_header **dst;
 458         struct usb_descriptor_header **hdr;
 459         unsigned int control_size;
 460         unsigned int streaming_size;
 461         unsigned int n_desc;
 462         unsigned int bytes;
 463         void *mem;
 464
 465         switch (speed) {
 466         case USB_SPEED_SUPER:
 467                 uvc_control_desc = uvc->desc.ss_control;
 468                 uvc_streaming_cls = uvc->desc.ss_streaming;
 469                 uvc_streaming_std = uvc_ss_streaming;
 470                 uvc_control_ep = &uvc_ss_control_ep;
 471                 break;
 472
 473         case USB_SPEED_HIGH:
 474                 uvc_control_desc = uvc->desc.fs_control;
 475                 uvc_streaming_cls = uvc->desc.hs_streaming;
 476                 uvc_streaming_std = uvc_hs_streaming;
 477                 uvc_control_ep = &uvc_fs_control_ep;
 478                 break;
 479
 480         case USB_SPEED_FULL:
 481         default:
 482                 uvc_control_desc = uvc->desc.fs_control;
 483                 uvc_streaming_cls = uvc->desc.fs_streaming;
 484                 uvc_streaming_std = uvc_fs_streaming;
 485                 uvc_control_ep = &uvc_fs_control_ep;
 486                 break;
 487         }
 488
 489         /* Descriptors layout
 490          *
 491          * uvc_iad
 492          * uvc_control_intf
 493          * Class-specific UVC control descriptors
 494          * uvc_control_ep
 495          * uvc_control_cs_ep
 496          * uvc_streaming_intf_alt0
 497          * Class-specific UVC streaming descriptors
 498          * uvc_{fs|hs}_streaming
 499          */
 500
 501         /* Count descriptors and compute their size. */
 502         control_size = 0;
 503         streaming_size = 0;
 504         bytes = uvc_iad.bLength + uvc_control_intf.bLength
 505               + uvc_control_ep->bLength + uvc_control_cs_ep.bLength
 506               + uvc_streaming_intf_alt0.bLength;
 507
 508         if (speed == USB_SPEED_SUPER) {
 509                 bytes += uvc_ss_control_comp.bLength;
 510                 n_desc = 6;
 511         } else {
 512                 n_desc = 5;
 513         }
 514
 515         for (src = (const struct usb_descriptor_header **)uvc_control_desc;
 516                         *src; ++src) {
 517                 control_size += (*src)->bLength;
 518                 bytes += (*src)->bLength;
 519                 n_desc++;
 520         }
 521         for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
 522                         *src; ++src) {
 523                 streaming_size += (*src)->bLength;
 524                 bytes += (*src)->bLength;
 525                 n_desc++;
 526         }
 527         for (src = uvc_streaming_std; *src; ++src) {
 528                 bytes += (*src)->bLength;
 529                 n_desc++;
 530         }
 531
 532         mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
 533         if (mem == NULL)
 534                 return NULL;
 535
 536         hdr = mem;
 537         dst = mem;
 538         mem += (n_desc + 1) * sizeof(*src);
 539
 540         /* Copy the descriptors. */
 541         UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
 542         UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
 543
 544         uvc_control_header = mem;
 545         UVC_COPY_DESCRIPTORS(mem, dst,
 546                 (const struct usb_descriptor_header **)uvc_control_desc);
 547         uvc_control_header->wTotalLength = cpu_to_le16(control_size);
 548         uvc_control_header->bInCollection = 1;
 549         uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
 550
 551         UVC_COPY_DESCRIPTOR(mem, dst, uvc_control_ep);
 552         if (speed == USB_SPEED_SUPER)
 553                 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
 554
 555         UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
 556         UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
 557
 558         uvc_streaming_header = mem;
 559         UVC_COPY_DESCRIPTORS(mem, dst,
 560                 (const struct usb_descriptor_header**)uvc_streaming_cls);
 561         uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
 562         uvc_streaming_header->bEndpointAddress =
 563                 uvc_fs_streaming_ep.bEndpointAddress;
 564
 565         UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
 566
 567         *dst = NULL;
 568         return hdr;
 569 }
 570
 571 static void
 572 uvc_function_unbind(struct usb_configuration *c, struct usb_function *f)
 573 {
 574         struct usb_composite_dev *cdev = c->cdev;
 575         struct uvc_device *uvc = to_uvc(f);
 576
 577         INFO(cdev, "uvc_function_unbind\n");
 578
 579         video_unregister_device(uvc->vdev);
 580         uvc->control_ep->driver_data = NULL;
 581         uvc->video.ep->driver_data = NULL;
 582
 583         usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
 584         kfree(uvc->control_buf);
 585
 586         usb_free_all_descriptors(f);
 587
 588         kfree(uvc);
 589 }
 590
 591 static int __init
 592 uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 593 {
 594         struct usb_composite_dev *cdev = c->cdev;
 595         struct uvc_device *uvc = to_uvc(f);
 596         struct usb_ep *ep;
 597         int ret = -EINVAL;
 598
 599         INFO(cdev, "uvc_function_bind\n");
 600
 601         /* sanity check the streaming endpoint module parameters */
 602         if (streaming_interval < 1)
 603                 streaming_interval = 1;
 604         if (streaming_interval > 16)
 605                 streaming_interval = 16;
 606         if (streaming_mult > 2)
 607                 streaming_mult = 2;
 608         if (streaming_maxburst > 15)
 609                 streaming_maxburst = 15;
 610
 611         /*
 612          * fill in the FS video streaming specific descriptors from the
 613          * module parameters
 614          */
 615         uvc_fs_streaming_ep.wMaxPacketSize = streaming_maxpacket > 1023 ?
 616                                                 1023 : streaming_maxpacket;
 617         uvc_fs_streaming_ep.bInterval = streaming_interval;
 618
 619         /* Allocate endpoints. */
 620         ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_control_ep);
 621         if (!ep) {
 622                 INFO(cdev, "Unable to allocate control EP\n");
 623                 goto error;
 624         }
 625         uvc->control_ep = ep;
 626         ep->driver_data = uvc;
 627
 628         ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
 629         if (!ep) {
 630                 INFO(cdev, "Unable to allocate streaming EP\n");
 631                 goto error;
 632         }
 633         uvc->video.ep = ep;
 634         ep->driver_data = uvc;
 635
 636         /* Allocate interface IDs. */
 637         if ((ret = usb_interface_id(c, f)) < 0)
 638                 goto error;
 639         uvc_iad.bFirstInterface = ret;
 640         uvc_control_intf.bInterfaceNumber = ret;
 641         uvc->control_intf = ret;
 642
 643         if ((ret = usb_interface_id(c, f)) < 0)
 644                 goto error;
 645         uvc_streaming_intf_alt0.bInterfaceNumber = ret;
 646         uvc_streaming_intf_alt1.bInterfaceNumber = ret;
 647         uvc->streaming_intf = ret;
 648
 649         /* sanity check the streaming endpoint module parameters */
 650         if (streaming_maxpacket > 1024)
 651                 streaming_maxpacket = 1024;
 652         /*
 653          * Fill in the HS descriptors from the module parameters for the Video
 654          * Streaming endpoint.
 655          * NOTE: We assume that the user knows what they are doing and won't
 656          * give parameters that their UDC doesn't support.
 657          */
 658         uvc_hs_streaming_ep.wMaxPacketSize = streaming_maxpacket;
 659         uvc_hs_streaming_ep.wMaxPacketSize |= streaming_mult << 11;
 660         uvc_hs_streaming_ep.bInterval = streaming_interval;
 661         uvc_hs_streaming_ep.bEndpointAddress =
 662                 uvc_fs_streaming_ep.bEndpointAddress;
 663
 664         /*
 665          * Fill in the SS descriptors from the module parameters for the Video
 666          * Streaming endpoint.
 667          * NOTE: We assume that the user knows what they are doing and won't
 668          * give parameters that their UDC doesn't support.
 669          */
 670         uvc_ss_streaming_ep.wMaxPacketSize = streaming_maxpacket;
 671         uvc_ss_streaming_ep.bInterval = streaming_interval;
 672         uvc_ss_streaming_comp.bmAttributes = streaming_mult;
 673         uvc_ss_streaming_comp.bMaxBurst = streaming_maxburst;
 674         uvc_ss_streaming_comp.wBytesPerInterval =
 675                 streaming_maxpacket * (streaming_mult + 1) *
 676                 (streaming_maxburst + 1);
 677         uvc_ss_streaming_ep.bEndpointAddress =
 678                 uvc_fs_streaming_ep.bEndpointAddress;
 679
 680         /* Copy descriptors */
 681         f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
 682         if (gadget_is_dualspeed(cdev->gadget))
 683                 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
 684         if (gadget_is_superspeed(c->cdev->gadget))
 685                 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER);
 686
 687         /* Preallocate control endpoint request. */
 688         uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
 689         uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
 690         if (uvc->control_req == NULL || uvc->control_buf == NULL) {
 691                 ret = -ENOMEM;
 692                 goto error;
 693         }
 694
 695         uvc->control_req->buf = uvc->control_buf;
 696         uvc->control_req->complete = uvc_function_ep0_complete;
 697         uvc->control_req->context = uvc;
 698
 699         /* Avoid letting this gadget enumerate until the userspace server is
 700          * active.
 701          */
 702         if ((ret = usb_function_deactivate(f)) < 0)
 703                 goto error;
 704
 705         /* Initialise video. */
 706         ret = uvc_video_init(&uvc->video);
 707         if (ret < 0)
 708                 goto error;
 709
 710         /* Register a V4L2 device. */
 711         ret = uvc_register_video(uvc);
 712         if (ret < 0) {
 713                 printk(KERN_INFO "Unable to register video device\n");
 714                 goto error;
 715         }
 716
 717         return 0;
 718
 719 error:
 720         if (uvc->vdev)
 721                 video_device_release(uvc->vdev);
 722
 723         if (uvc->control_ep)
 724                 uvc->control_ep->driver_data = NULL;
 725         if (uvc->video.ep)
 726                 uvc->video.ep->driver_data = NULL;
 727
 728         if (uvc->control_req) {
 729                 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
 730                 kfree(uvc->control_buf);
 731         }
 732
 733         usb_free_all_descriptors(f);
 734         return ret;
 735 }
 736
 737 /* --------------------------------------------------------------------------
 738  * USB gadget function
 739  */
 740
 741 /**
 742  * uvc_bind_config - add a UVC function to a configuration
 743  * @c: the configuration to support the UVC instance
 744  * Context: single threaded during gadget setup
 745  *
 746  * Returns zero on success, else negative errno.
 747  *
 748  * Caller must have called @uvc_setup(). Caller is also responsible for
 749  * calling @uvc_cleanup() before module unload.
 750  */
 751 int __init
 752 uvc_bind_config(struct usb_configuration *c,
 753                 const struct uvc_descriptor_header * const *fs_control,
 754                 const struct uvc_descriptor_header * const *ss_control,
 755                 const struct uvc_descriptor_header * const *fs_streaming,
 756                 const struct uvc_descriptor_header * const *hs_streaming,
 757                 const struct uvc_descriptor_header * const *ss_streaming)
 758 {
 759         struct uvc_device *uvc;
 760         int ret = 0;
 761
 762         /* TODO Check if the USB device controller supports the required
 763          * features.
 764          */
 765         if (!gadget_is_dualspeed(c->cdev->gadget))
 766                 return -EINVAL;
 767
 768         uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
 769         if (uvc == NULL)
 770                 return -ENOMEM;
 771
 772         uvc->state = UVC_STATE_DISCONNECTED;
 773
 774         /* Validate the descriptors. */
 775         if (fs_control == NULL || fs_control[0] == NULL ||
 776                 fs_control[0]->bDescriptorSubType != UVC_VC_HEADER)
 777                 goto error;
 778
 779         if (ss_control == NULL || ss_control[0] == NULL ||
 780                 ss_control[0]->bDescriptorSubType != UVC_VC_HEADER)
 781                 goto error;
 782
 783         if (fs_streaming == NULL || fs_streaming[0] == NULL ||
 784                 fs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
 785                 goto error;
 786
 787         if (hs_streaming == NULL || hs_streaming[0] == NULL ||
 788                 hs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
 789                 goto error;
 790
 791         if (ss_streaming == NULL || ss_streaming[0] == NULL ||
 792                 ss_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
 793                 goto error;
 794
 795         uvc->desc.fs_control = fs_control;
 796         uvc->desc.ss_control = ss_control;
 797         uvc->desc.fs_streaming = fs_streaming;
 798         uvc->desc.hs_streaming = hs_streaming;
 799         uvc->desc.ss_streaming = ss_streaming;
 800
 801         /* maybe allocate device-global string IDs, and patch descriptors */
 802         if (uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id == 0) {
 803                 /* Allocate string descriptor numbers. */
 804                 ret = usb_string_id(c->cdev);
 805                 if (ret < 0)
 806                         goto error;
 807                 uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id = ret;
 808                 uvc_iad.iFunction = ret;
 809
 810                 ret = usb_string_id(c->cdev);
 811                 if (ret < 0)
 812                         goto error;
 813                 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = ret;
 814                 uvc_control_intf.iInterface = ret;
 815
 816                 ret = usb_string_id(c->cdev);
 817                 if (ret < 0)
 818                         goto error;
 819                 uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id = ret;
 820                 uvc_streaming_intf_alt0.iInterface = ret;
 821                 uvc_streaming_intf_alt1.iInterface = ret;
 822         }
 823
 824         /* Register the function. */
 825         uvc->func.name = "uvc";
 826         uvc->func.strings = uvc_function_strings;
 827         uvc->func.bind = uvc_function_bind;
 828         uvc->func.unbind = uvc_function_unbind;
 829         uvc->func.get_alt = uvc_function_get_alt;
 830         uvc->func.set_alt = uvc_function_set_alt;
 831         uvc->func.disable = uvc_function_disable;
 832         uvc->func.setup = uvc_function_setup;
 833
 834         ret = usb_add_function(c, &uvc->func);
 835         if (ret)
 836                 kfree(uvc);
 837
 838         return ret;
 839
 840 error:
 841         kfree(uvc);
 842         return ret;
 843 }
 844
 845 module_param_named(trace, uvc_gadget_trace_param, uint, S_IRUGO|S_IWUSR);
 846 MODULE_PARM_DESC(trace, "Trace level bitmask");
 847