drivers/usb/gadget/function/f_uvc.c

   1 /*
   2  *      uvc_gadget.c  --  USB Video Class Gadget driver
   3  *
   4  *      Copyright (C) 2009-2010
   5  *          Laurent Pinchart ([email protected])
   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");