drivers/media/video/hdpvr/hdpvr-video.c

   1 /*
   2  * Hauppauge HD PVR USB driver - video 4 linux 2 interface
   3  *
   4  * Copyright (C) 2008      Janne Grunau (j@jannau.net)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <linux/uaccess.h>
  18 #include <linux/usb.h>
  19 #include <linux/mutex.h>
  20 #include <linux/version.h>
  21 #include <linux/workqueue.h>
  22
  23 #include <linux/videodev2.h>
  24 #include <media/v4l2-dev.h>
  25 #include <media/v4l2-common.h>
  26 #include <media/v4l2-ioctl.h>
  27 #include "hdpvr.h"
  28
  29 #define BULK_URB_TIMEOUT 1250 /* 1.25 seconds */
  30
  31 #define print_buffer_status() { \
  32                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,       \
  33                          "%s:%d buffer stat: %d free, %d proc\n",       \
  34                          __func__, __LINE__,                            \
  35                          list_size(&dev->free_buff_list),               \
  36                          list_size(&dev->rec_buff_list)); }
  37
  38 struct hdpvr_fh {
  39         struct hdpvr_device     *dev;
  40 };
  41
  42 static uint list_size(struct list_head *list)
  43 {
  44         struct list_head *tmp;
  45         uint count = 0;
  46
  47         list_for_each(tmp, list) {
  48                 count++;
  49         }
  50
  51         return count;
  52 }
  53
  54 /*=========================================================================*/
  55 /* urb callback */
  56 static void hdpvr_read_bulk_callback(struct urb *urb)
  57 {
  58         struct hdpvr_buffer *buf = (struct hdpvr_buffer *)urb->context;
  59         struct hdpvr_device *dev = buf->dev;
  60
  61         /* marking buffer as received and wake waiting */
  62         buf->status = BUFSTAT_READY;
  63         wake_up_interruptible(&dev->wait_data);
  64 }
  65
  66 /*=========================================================================*/
  67 /* bufffer bits */
  68
  69 /* function expects dev->io_mutex to be hold by caller */
  70 int hdpvr_cancel_queue(struct hdpvr_device *dev)
  71 {
  72         struct hdpvr_buffer *buf;
  73
  74         list_for_each_entry(buf, &dev->rec_buff_list, buff_list) {
  75                 usb_kill_urb(buf->urb);
  76                 buf->status = BUFSTAT_AVAILABLE;
  77         }
  78
  79         list_splice_init(&dev->rec_buff_list, dev->free_buff_list.prev);
  80
  81         return 0;
  82 }
  83
  84 static int hdpvr_free_queue(struct list_head *q)
  85 {
  86         struct list_head *tmp;
  87         struct list_head *p;
  88         struct hdpvr_buffer *buf;
  89         struct urb *urb;
  90
  91         for (p = q->next; p != q;) {
  92                 buf = list_entry(p, struct hdpvr_buffer, buff_list);
  93
  94                 urb = buf->urb;
  95                 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
  96                                 urb->transfer_buffer, urb->transfer_dma);
  97                 usb_free_urb(urb);
  98                 tmp = p->next;
  99                 list_del(p);
 100                 kfree(buf);
 101                 p = tmp;
 102         }
 103
 104         return 0;
 105 }
 106
 107 /* function expects dev->io_mutex to be hold by caller */
 108 int hdpvr_free_buffers(struct hdpvr_device *dev)
 109 {
 110         hdpvr_cancel_queue(dev);
 111
 112         hdpvr_free_queue(&dev->free_buff_list);
 113         hdpvr_free_queue(&dev->rec_buff_list);
 114
 115         return 0;
 116 }
 117
 118 /* function expects dev->io_mutex to be hold by caller */
 119 int hdpvr_alloc_buffers(struct hdpvr_device *dev, uint count)
 120 {
 121         uint i;
 122         int retval = -ENOMEM;
 123         u8 *mem;
 124         struct hdpvr_buffer *buf;
 125         struct urb *urb;
 126
 127         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 128                  "allocating %u buffers\n", count);
 129
 130         for (i = 0; i < count; i++) {
 131
 132                 buf = kzalloc(sizeof(struct hdpvr_buffer), GFP_KERNEL);
 133                 if (!buf) {
 134                         v4l2_err(&dev->v4l2_dev, "cannot allocate buffer\n");
 135                         goto exit;
 136                 }
 137                 buf->dev = dev;
 138
 139                 urb = usb_alloc_urb(0, GFP_KERNEL);
 140                 if (!urb) {
 141                         v4l2_err(&dev->v4l2_dev, "cannot allocate urb\n");
 142                         goto exit;
 143                 }
 144                 buf->urb = urb;
 145
 146                 mem = usb_buffer_alloc(dev->udev, dev->bulk_in_size, GFP_KERNEL,
 147                                        &urb->transfer_dma);
 148                 if (!mem) {
 149                         v4l2_err(&dev->v4l2_dev,
 150                                  "cannot allocate usb transfer buffer\n");
 151                         goto exit;
 152                 }
 153
 154                 usb_fill_bulk_urb(buf->urb, dev->udev,
 155                                   usb_rcvbulkpipe(dev->udev,
 156                                                   dev->bulk_in_endpointAddr),
 157                                   mem, dev->bulk_in_size,
 158                                   hdpvr_read_bulk_callback, buf);
 159
 160                 buf->status = BUFSTAT_AVAILABLE;
 161                 list_add_tail(&buf->buff_list, &dev->free_buff_list);
 162         }
 163         return 0;
 164 exit:
 165         hdpvr_free_buffers(dev);
 166         return retval;
 167 }
 168
 169 static int hdpvr_submit_buffers(struct hdpvr_device *dev)
 170 {
 171         struct hdpvr_buffer *buf;
 172         struct urb *urb;
 173         int ret = 0, err_count = 0;
 174
 175         mutex_lock(&dev->io_mutex);
 176
 177         while (dev->status == STATUS_STREAMING &&
 178                !list_empty(&dev->free_buff_list)) {
 179
 180                 buf = list_entry(dev->free_buff_list.next, struct hdpvr_buffer,
 181                                  buff_list);
 182                 if (buf->status != BUFSTAT_AVAILABLE) {
 183                         v4l2_err(&dev->v4l2_dev,
 184                                  "buffer not marked as availbale\n");
 185                         ret = -EFAULT;
 186                         goto err;
 187                 }
 188
 189                 urb = buf->urb;
 190                 urb->status = 0;
 191                 urb->actual_length = 0;
 192                 ret = usb_submit_urb(urb, GFP_KERNEL);
 193                 if (ret) {
 194                         v4l2_err(&dev->v4l2_dev,
 195                                  "usb_submit_urb in %s returned %d\n",
 196                                  __func__, ret);
 197                         if (++err_count > 2)
 198                                 break;
 199                         continue;
 200                 }
 201                 buf->status = BUFSTAT_INPROGRESS;
 202                 list_move_tail(&buf->buff_list, &dev->rec_buff_list);
 203         }
 204 err:
 205         print_buffer_status();
 206         mutex_unlock(&dev->io_mutex);
 207         return ret;
 208 }
 209
 210 static struct hdpvr_buffer *hdpvr_get_next_buffer(struct hdpvr_device *dev)
 211 {
 212         struct hdpvr_buffer *buf;
 213
 214         mutex_lock(&dev->io_mutex);
 215
 216         if (list_empty(&dev->rec_buff_list)) {
 217                 mutex_unlock(&dev->io_mutex);
 218                 return NULL;
 219         }
 220
 221         buf = list_entry(dev->rec_buff_list.next, struct hdpvr_buffer,
 222                          buff_list);
 223         mutex_unlock(&dev->io_mutex);
 224
 225         return buf;
 226 }
 227
 228 static void hdpvr_transmit_buffers(struct work_struct *work)
 229 {
 230         struct hdpvr_device *dev = container_of(work, struct hdpvr_device,
 231                                                 worker);
 232
 233         while (dev->status == STATUS_STREAMING) {
 234
 235                 if (hdpvr_submit_buffers(dev)) {
 236                         v4l2_err(&dev->v4l2_dev, "couldn't submit buffers\n");
 237                         goto error;
 238                 }
 239                 if (wait_event_interruptible(dev->wait_buffer,
 240                                 !list_empty(&dev->free_buff_list) ||
 241                                              dev->status != STATUS_STREAMING))
 242                         goto error;
 243         }
 244
 245         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 246                  "transmit worker exited\n");
 247         return;
 248 error:
 249         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 250                  "transmit buffers errored\n");
 251         dev->status = STATUS_ERROR;
 252 }
 253
 254 /* function expects dev->io_mutex to be hold by caller */
 255 static int hdpvr_start_streaming(struct hdpvr_device *dev)
 256 {
 257         int ret;
 258         struct hdpvr_video_info *vidinf;
 259
 260         if (dev->status == STATUS_STREAMING)
 261                 return 0;
 262         else if (dev->status != STATUS_IDLE)
 263                 return -EAGAIN;
 264
 265         vidinf = get_video_info(dev);
 266
 267         if (vidinf) {
 268                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 269                          "video signal: %dx%d@%dhz\n", vidinf->width,
 270                          vidinf->height, vidinf->fps);
 271                 kfree(vidinf);
 272
 273                 /* start streaming 2 request */
 274                 ret = usb_control_msg(dev->udev,
 275                                       usb_sndctrlpipe(dev->udev, 0),
 276                                       0xb8, 0x38, 0x1, 0, NULL, 0, 8000);
 277                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 278                          "encoder start control request returned %d\n", ret);
 279
 280                 hdpvr_config_call(dev, CTRL_START_STREAMING_VALUE, 0x00);
 281
 282                 INIT_WORK(&dev->worker, hdpvr_transmit_buffers);
 283                 queue_work(dev->workqueue, &dev->worker);
 284
 285                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 286                          "streaming started\n");
 287                 dev->status = STATUS_STREAMING;
 288
 289                 return 0;
 290         }
 291         msleep(250);
 292         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 293                  "no video signal at input %d\n", dev->options.video_input);
 294         return -EAGAIN;
 295 }
 296
 297
 298 /* function expects dev->io_mutex to be hold by caller */
 299 static int hdpvr_stop_streaming(struct hdpvr_device *dev)
 300 {
 301         uint actual_length, c = 0;
 302         u8 *buf;
 303
 304         if (dev->status == STATUS_IDLE)
 305                 return 0;
 306         else if (dev->status != STATUS_STREAMING)
 307                 return -EAGAIN;
 308
 309         buf = kmalloc(dev->bulk_in_size, GFP_KERNEL);
 310         if (!buf)
 311                 v4l2_err(&dev->v4l2_dev, "failed to allocate temporary buffer "
 312                          "for emptying the internal device buffer. "
 313                          "Next capture start will be slow\n");
 314
 315         dev->status = STATUS_SHUTTING_DOWN;
 316         hdpvr_config_call(dev, CTRL_STOP_STREAMING_VALUE, 0x00);
 317         mutex_unlock(&dev->io_mutex);
 318
 319         wake_up_interruptible(&dev->wait_buffer);
 320         msleep(50);
 321
 322         flush_workqueue(dev->workqueue);
 323
 324         mutex_lock(&dev->io_mutex);
 325         /* kill the still outstanding urbs */
 326         hdpvr_cancel_queue(dev);
 327
 328         /* emptying the device buffer beforeshutting it down */
 329         while (buf && ++c < 500 &&
 330                !usb_bulk_msg(dev->udev,
 331                              usb_rcvbulkpipe(dev->udev,
 332                                              dev->bulk_in_endpointAddr),
 333                              buf, dev->bulk_in_size, &actual_length,
 334                              BULK_URB_TIMEOUT)) {
 335                 /* wait */
 336                 msleep(5);
 337                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 338                          "%2d: got %d bytes\n", c, actual_length);
 339         }
 340         kfree(buf);
 341         v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 342                  "used %d urbs to empty device buffers\n", c-1);
 343         msleep(10);
 344
 345         dev->status = STATUS_IDLE;
 346
 347         return 0;
 348 }
 349
 350
 351 /*=======================================================================*/
 352 /*
 353  * video 4 linux 2 file operations
 354  */
 355
 356 static int hdpvr_open(struct file *file)
 357 {
 358         struct hdpvr_device *dev;
 359         struct hdpvr_fh *fh;
 360         int retval = -ENOMEM;
 361
 362         dev = (struct hdpvr_device *)video_get_drvdata(video_devdata(file));
 363         if (!dev) {
 364                 v4l2_err(&dev->v4l2_dev, "open failing with with ENODEV\n");
 365                 retval = -ENODEV;
 366                 goto err;
 367         }
 368
 369         fh = kzalloc(sizeof(struct hdpvr_fh), GFP_KERNEL);
 370         if (!fh) {
 371                 v4l2_err(&dev->v4l2_dev, "Out of memory\n");
 372                 goto err;
 373         }
 374         /* lock the device to allow correctly handling errors
 375          * in resumption */
 376         mutex_lock(&dev->io_mutex);
 377         dev->open_count++;
 378
 379         fh->dev = dev;
 380
 381         /* save our object in the file's private structure */
 382         file->private_data = fh;
 383
 384         retval = 0;
 385 err:
 386         mutex_unlock(&dev->io_mutex);
 387         return retval;
 388 }
 389
 390 static int hdpvr_release(struct file *file)
 391 {
 392         struct hdpvr_fh         *fh  = (struct hdpvr_fh *)file->private_data;
 393         struct hdpvr_device     *dev = fh->dev;
 394
 395         if (!dev)
 396                 return -ENODEV;
 397
 398         mutex_lock(&dev->io_mutex);
 399         if (!(--dev->open_count) && dev->status == STATUS_STREAMING)
 400                 hdpvr_stop_streaming(dev);
 401
 402         mutex_unlock(&dev->io_mutex);
 403
 404         return 0;
 405 }
 406
 407 /*
 408  * hdpvr_v4l2_read()
 409  * will allocate buffers when called for the first time
 410  */
 411 static ssize_t hdpvr_read(struct file *file, char __user *buffer, size_t count,
 412                           loff_t *pos)
 413 {
 414         struct hdpvr_fh *fh = file->private_data;
 415         struct hdpvr_device *dev = fh->dev;
 416         struct hdpvr_buffer *buf = NULL;
 417         struct urb *urb;
 418         unsigned int ret = 0;
 419         int rem, cnt;
 420
 421         if (*pos)
 422                 return -ESPIPE;
 423
 424         if (!dev)
 425                 return -ENODEV;
 426
 427         mutex_lock(&dev->io_mutex);
 428         if (dev->status == STATUS_IDLE) {
 429                 if (hdpvr_start_streaming(dev)) {
 430                         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 431                                  "start_streaming failed\n");
 432                         ret = -EIO;
 433                         msleep(200);
 434                         dev->status = STATUS_IDLE;
 435                         mutex_unlock(&dev->io_mutex);
 436                         goto err;
 437                 }
 438                 print_buffer_status();
 439         }
 440         mutex_unlock(&dev->io_mutex);
 441
 442         /* wait for the first buffer */
 443         if (!(file->f_flags & O_NONBLOCK)) {
 444                 if (wait_event_interruptible(dev->wait_data,
 445                                              hdpvr_get_next_buffer(dev)))
 446                         return -ERESTARTSYS;
 447         }
 448
 449         buf = hdpvr_get_next_buffer(dev);
 450
 451         while (count > 0 && buf) {
 452
 453                 if (buf->status != BUFSTAT_READY &&
 454                     dev->status != STATUS_DISCONNECTED) {
 455                         /* return nonblocking */
 456                         if (file->f_flags & O_NONBLOCK) {
 457                                 if (!ret)
 458                                         ret = -EAGAIN;
 459                                 goto err;
 460                         }
 461
 462                         if (wait_event_interruptible(dev->wait_data,
 463                                               buf->status == BUFSTAT_READY)) {
 464                                 ret = -ERESTARTSYS;
 465                                 goto err;
 466                         }
 467                 }
 468
 469                 if (buf->status != BUFSTAT_READY)
 470                         break;
 471
 472                 /* set remaining bytes to copy */
 473                 urb = buf->urb;
 474                 rem = urb->actual_length - buf->pos;
 475                 cnt = rem > count ? count : rem;
 476
 477                 if (copy_to_user(buffer, urb->transfer_buffer + buf->pos,
 478                                  cnt)) {
 479                         v4l2_err(&dev->v4l2_dev, "read: copy_to_user failed\n");
 480                         if (!ret)
 481                                 ret = -EFAULT;
 482                         goto err;
 483                 }
 484
 485                 buf->pos += cnt;
 486                 count -= cnt;
 487                 buffer += cnt;
 488                 ret += cnt;
 489
 490                 /* finished, take next buffer */
 491                 if (buf->pos == urb->actual_length) {
 492                         mutex_lock(&dev->io_mutex);
 493                         buf->pos = 0;
 494                         buf->status = BUFSTAT_AVAILABLE;
 495
 496                         list_move_tail(&buf->buff_list, &dev->free_buff_list);
 497
 498                         print_buffer_status();
 499
 500                         mutex_unlock(&dev->io_mutex);
 501
 502                         wake_up_interruptible(&dev->wait_buffer);
 503
 504                         buf = hdpvr_get_next_buffer(dev);
 505                 }
 506         }
 507 err:
 508         if (!ret && !buf)
 509                 ret = -EAGAIN;
 510         return ret;
 511 }
 512
 513 static unsigned int hdpvr_poll(struct file *filp, poll_table *wait)
 514 {
 515         struct hdpvr_buffer *buf = NULL;
 516         struct hdpvr_fh *fh = (struct hdpvr_fh *)filp->private_data;
 517         struct hdpvr_device *dev = fh->dev;
 518         unsigned int mask = 0;
 519
 520         mutex_lock(&dev->io_mutex);
 521
 522         if (video_is_unregistered(dev->video_dev))
 523                 return -EIO;
 524
 525         if (dev->status == STATUS_IDLE) {
 526                 if (hdpvr_start_streaming(dev)) {
 527                         v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 528                                  "start_streaming failed\n");
 529                         dev->status = STATUS_IDLE;
 530                 }
 531
 532                 print_buffer_status();
 533         }
 534         mutex_unlock(&dev->io_mutex);
 535
 536         buf = hdpvr_get_next_buffer(dev);
 537         /* only wait if no data is available */
 538         if (!buf || buf->status != BUFSTAT_READY) {
 539                 poll_wait(filp, &dev->wait_data, wait);
 540                 buf = hdpvr_get_next_buffer(dev);
 541         }
 542         if (buf && buf->status == BUFSTAT_READY)
 543                 mask |= POLLIN | POLLRDNORM;
 544
 545         return mask;
 546 }
 547
 548
 549 static const struct v4l2_file_operations hdpvr_fops = {
 550         .owner          = THIS_MODULE,
 551         .open           = hdpvr_open,
 552         .release        = hdpvr_release,
 553         .read           = hdpvr_read,
 554         .poll           = hdpvr_poll,
 555         .unlocked_ioctl = video_ioctl2,
 556 };
 557
 558 /*=======================================================================*/
 559 /*
 560  * V4L2 ioctl handling
 561  */
 562
 563 static int vidioc_querycap(struct file *file, void  *priv,
 564                            struct v4l2_capability *cap)
 565 {
 566         struct hdpvr_device *dev = video_drvdata(file);
 567
 568         strcpy(cap->driver, "hdpvr");
 569         strcpy(cap->card, "Haupauge HD PVR");
 570         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 571         cap->version = HDPVR_VERSION;
 572         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 573                                 V4L2_CAP_AUDIO         |
 574                                 V4L2_CAP_READWRITE;
 575         return 0;
 576 }
 577
 578 static int vidioc_s_std(struct file *file, void *private_data,
 579                         v4l2_std_id *std)
 580 {
 581         struct hdpvr_fh *fh = file->private_data;
 582         struct hdpvr_device *dev = fh->dev;
 583         u8 std_type = 1;
 584
 585         if (*std & (V4L2_STD_NTSC | V4L2_STD_PAL_60))
 586                 std_type = 0;
 587
 588         return hdpvr_config_call(dev, CTRL_VIDEO_STD_TYPE, std_type);
 589 }
 590
 591 static const char *iname[] = {
 592         [HDPVR_COMPONENT] = "Component",
 593         [HDPVR_SVIDEO]    = "S-Video",
 594         [HDPVR_COMPOSITE] = "Composite",
 595 };
 596
 597 static int vidioc_enum_input(struct file *file, void *priv,
 598                                 struct v4l2_input *i)
 599 {
 600         struct hdpvr_fh *fh = file->private_data;
 601         struct hdpvr_device *dev = fh->dev;
 602         unsigned int n;
 603
 604         n = i->index;
 605         if (n >= HDPVR_VIDEO_INPUTS)
 606                 return -EINVAL;
 607
 608         i->type = V4L2_INPUT_TYPE_CAMERA;
 609
 610         strncpy(i->name, iname[n], sizeof(i->name) - 1);
 611         i->name[sizeof(i->name) - 1] = '\0';
 612
 613         i->audioset = 1<<HDPVR_RCA_FRONT | 1<<HDPVR_RCA_BACK | 1<<HDPVR_SPDIF;
 614
 615         i->std = dev->video_dev->tvnorms;
 616
 617         return 0;
 618 }
 619
 620 static int vidioc_s_input(struct file *file, void *private_data,
 621                           unsigned int index)
 622 {
 623         struct hdpvr_fh *fh = file->private_data;
 624         struct hdpvr_device *dev = fh->dev;
 625         int retval;
 626
 627         if (index >= HDPVR_VIDEO_INPUTS)
 628                 return -EINVAL;
 629
 630         if (dev->status != STATUS_IDLE)
 631                 return -EAGAIN;
 632
 633         retval = hdpvr_config_call(dev, CTRL_VIDEO_INPUT_VALUE, index+1);
 634         if (!retval)
 635                 dev->options.video_input = index;
 636
 637         return retval;
 638 }
 639
 640 static int vidioc_g_input(struct file *file, void *private_data,
 641                           unsigned int *index)
 642 {
 643         struct hdpvr_fh *fh = file->private_data;
 644         struct hdpvr_device *dev = fh->dev;
 645
 646         *index = dev->options.video_input;
 647         return 0;
 648 }
 649
 650
 651 static const char *audio_iname[] = {
 652         [HDPVR_RCA_FRONT] = "RCA front",
 653         [HDPVR_RCA_BACK]  = "RCA back",
 654         [HDPVR_SPDIF]     = "SPDIF",
 655 };
 656
 657 static int vidioc_enumaudio(struct file *file, void *priv,
 658                                 struct v4l2_audio *audio)
 659 {
 660         unsigned int n;
 661
 662         n = audio->index;
 663         if (n >= HDPVR_AUDIO_INPUTS)
 664                 return -EINVAL;
 665
 666         audio->capability = V4L2_AUDCAP_STEREO;
 667
 668         strncpy(audio->name, audio_iname[n], sizeof(audio->name) - 1);
 669         audio->name[sizeof(audio->name) - 1] = '\0';
 670
 671         return 0;
 672 }
 673
 674 static int vidioc_s_audio(struct file *file, void *private_data,
 675                           struct v4l2_audio *audio)
 676 {
 677         struct hdpvr_fh *fh = file->private_data;
 678         struct hdpvr_device *dev = fh->dev;
 679         int retval;
 680
 681         if (audio->index >= HDPVR_AUDIO_INPUTS)
 682                 return -EINVAL;
 683
 684         if (dev->status != STATUS_IDLE)
 685                 return -EAGAIN;
 686
 687         retval = hdpvr_set_audio(dev, audio->index+1, dev->options.audio_codec);
 688         if (!retval)
 689                 dev->options.audio_input = audio->index;
 690
 691         return retval;
 692 }
 693
 694 static int vidioc_g_audio(struct file *file, void *private_data,
 695                           struct v4l2_audio *audio)
 696 {
 697         struct hdpvr_fh *fh = file->private_data;
 698         struct hdpvr_device *dev = fh->dev;
 699
 700         audio->index = dev->options.audio_input;
 701         audio->capability = V4L2_AUDCAP_STEREO;
 702         strncpy(audio->name, audio_iname[audio->index], sizeof(audio->name));
 703         audio->name[sizeof(audio->name) - 1] = '\0';
 704         return 0;
 705 }
 706
 707 static const s32 supported_v4l2_ctrls[] = {
 708         V4L2_CID_BRIGHTNESS,
 709         V4L2_CID_CONTRAST,
 710         V4L2_CID_SATURATION,
 711         V4L2_CID_HUE,
 712         V4L2_CID_SHARPNESS,
 713         V4L2_CID_MPEG_AUDIO_ENCODING,
 714         V4L2_CID_MPEG_VIDEO_ENCODING,
 715         V4L2_CID_MPEG_VIDEO_BITRATE_MODE,
 716         V4L2_CID_MPEG_VIDEO_BITRATE,
 717         V4L2_CID_MPEG_VIDEO_BITRATE_PEAK,
 718 };
 719
 720 static int fill_queryctrl(struct hdpvr_options *opt, struct v4l2_queryctrl *qc,
 721                           int ac3)
 722 {
 723         int err;
 724
 725         switch (qc->id) {
 726         case V4L2_CID_BRIGHTNESS:
 727                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x86);
 728         case V4L2_CID_CONTRAST:
 729                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 730         case V4L2_CID_SATURATION:
 731                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 732         case V4L2_CID_HUE:
 733                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 734         case V4L2_CID_SHARPNESS:
 735                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 736         case V4L2_CID_MPEG_AUDIO_ENCODING:
 737                 return v4l2_ctrl_query_fill(
 738                         qc, V4L2_MPEG_AUDIO_ENCODING_AAC,
 739                         ac3 ? V4L2_MPEG_AUDIO_ENCODING_AC3
 740                         : V4L2_MPEG_AUDIO_ENCODING_AAC,
 741                         1, V4L2_MPEG_AUDIO_ENCODING_AAC);
 742         case V4L2_CID_MPEG_VIDEO_ENCODING:
 743                 return v4l2_ctrl_query_fill(
 744                         qc, V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC,
 745                         V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC, 1,
 746                         V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC);
 747
 748 /*      case V4L2_CID_MPEG_VIDEO_? maybe keyframe interval: */
 749 /*              return v4l2_ctrl_query_fill(qc, 0, 128, 128, 0); */
 750         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 751                 return v4l2_ctrl_query_fill(
 752                         qc, V4L2_MPEG_VIDEO_BITRATE_MODE_VBR,
 753                         V4L2_MPEG_VIDEO_BITRATE_MODE_CBR, 1,
 754                         V4L2_MPEG_VIDEO_BITRATE_MODE_CBR);
 755
 756         case V4L2_CID_MPEG_VIDEO_BITRATE:
 757                 return v4l2_ctrl_query_fill(qc, 1000000, 13500000, 100000,
 758                                             6500000);
 759         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 760                 err = v4l2_ctrl_query_fill(qc, 1100000, 20200000, 100000,
 761                                            9000000);
 762                 if (!err && opt->bitrate_mode == HDPVR_CONSTANT)
 763                         qc->flags |= V4L2_CTRL_FLAG_INACTIVE;
 764                 return err;
 765         default:
 766                 return -EINVAL;
 767         }
 768 }
 769
 770 static int vidioc_queryctrl(struct file *file, void *private_data,
 771                             struct v4l2_queryctrl *qc)
 772 {
 773         struct hdpvr_fh *fh = file->private_data;
 774         struct hdpvr_device *dev = fh->dev;
 775         int i, next;
 776         u32 id = qc->id;
 777
 778         memset(qc, 0, sizeof(*qc));
 779
 780         next = !!(id &  V4L2_CTRL_FLAG_NEXT_CTRL);
 781         qc->id = id & ~V4L2_CTRL_FLAG_NEXT_CTRL;
 782
 783         for (i = 0; i < ARRAY_SIZE(supported_v4l2_ctrls); i++) {
 784                 if (next) {
 785                         if (qc->id < supported_v4l2_ctrls[i])
 786                                 qc->id = supported_v4l2_ctrls[i];
 787                         else
 788                                 continue;
 789                 }
 790
 791                 if (qc->id == supported_v4l2_ctrls[i])
 792                         return fill_queryctrl(&dev->options, qc,
 793                                               dev->flags & HDPVR_FLAG_AC3_CAP);
 794
 795                 if (qc->id < supported_v4l2_ctrls[i])
 796                         break;
 797         }
 798
 799         return -EINVAL;
 800 }
 801
 802 static int vidioc_g_ctrl(struct file *file, void *private_data,
 803                          struct v4l2_control *ctrl)
 804 {
 805         struct hdpvr_fh *fh = file->private_data;
 806         struct hdpvr_device *dev = fh->dev;
 807
 808         switch (ctrl->id) {
 809         case V4L2_CID_BRIGHTNESS:
 810                 ctrl->value = dev->options.brightness;
 811                 break;
 812         case V4L2_CID_CONTRAST:
 813                 ctrl->value = dev->options.contrast;
 814                 break;
 815         case V4L2_CID_SATURATION:
 816                 ctrl->value = dev->options.saturation;
 817                 break;
 818         case V4L2_CID_HUE:
 819                 ctrl->value = dev->options.hue;
 820                 break;
 821         case V4L2_CID_SHARPNESS:
 822                 ctrl->value = dev->options.sharpness;
 823                 break;
 824         default:
 825                 return -EINVAL;
 826         }
 827         return 0;
 828 }
 829
 830 static int vidioc_s_ctrl(struct file *file, void *private_data,
 831                          struct v4l2_control *ctrl)
 832 {
 833         struct hdpvr_fh *fh = file->private_data;
 834         struct hdpvr_device *dev = fh->dev;
 835         int retval;
 836
 837         switch (ctrl->id) {
 838         case V4L2_CID_BRIGHTNESS:
 839                 retval = hdpvr_config_call(dev, CTRL_BRIGHTNESS, ctrl->value);
 840                 if (!retval)
 841                         dev->options.brightness = ctrl->value;
 842                 break;
 843         case V4L2_CID_CONTRAST:
 844                 retval = hdpvr_config_call(dev, CTRL_CONTRAST, ctrl->value);
 845                 if (!retval)
 846                         dev->options.contrast = ctrl->value;
 847                 break;
 848         case V4L2_CID_SATURATION:
 849                 retval = hdpvr_config_call(dev, CTRL_SATURATION, ctrl->value);
 850                 if (!retval)
 851                         dev->options.saturation = ctrl->value;
 852                 break;
 853         case V4L2_CID_HUE:
 854                 retval = hdpvr_config_call(dev, CTRL_HUE, ctrl->value);
 855                 if (!retval)
 856                         dev->options.hue = ctrl->value;
 857                 break;
 858         case V4L2_CID_SHARPNESS:
 859                 retval = hdpvr_config_call(dev, CTRL_SHARPNESS, ctrl->value);
 860                 if (!retval)
 861                         dev->options.sharpness = ctrl->value;
 862                 break;
 863         default:
 864                 return -EINVAL;
 865         }
 866
 867         return retval;
 868 }
 869
 870
 871 static int hdpvr_get_ctrl(struct hdpvr_options *opt,
 872                           struct v4l2_ext_control *ctrl)
 873 {
 874         switch (ctrl->id) {
 875         case V4L2_CID_MPEG_AUDIO_ENCODING:
 876                 ctrl->value = opt->audio_codec;
 877                 break;
 878         case V4L2_CID_MPEG_VIDEO_ENCODING:
 879                 ctrl->value = V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC;
 880                 break;
 881 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
 882 /*              ctrl->value = (opt->gop_mode & 0x2) ? 0 : 128; */
 883 /*              break; */
 884         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 885                 ctrl->value = opt->bitrate_mode == HDPVR_CONSTANT
 886                         ? V4L2_MPEG_VIDEO_BITRATE_MODE_CBR
 887                         : V4L2_MPEG_VIDEO_BITRATE_MODE_VBR;
 888                 break;
 889         case V4L2_CID_MPEG_VIDEO_BITRATE:
 890                 ctrl->value = opt->bitrate * 100000;
 891                 break;
 892         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 893                 ctrl->value = opt->peak_bitrate * 100000;
 894                 break;
 895         case V4L2_CID_MPEG_STREAM_TYPE:
 896                 ctrl->value = V4L2_MPEG_STREAM_TYPE_MPEG2_TS;
 897                 break;
 898         default:
 899                 return -EINVAL;
 900         }
 901         return 0;
 902 }
 903
 904 static int vidioc_g_ext_ctrls(struct file *file, void *priv,
 905                               struct v4l2_ext_controls *ctrls)
 906 {
 907         struct hdpvr_fh *fh = file->private_data;
 908         struct hdpvr_device *dev = fh->dev;
 909         int i, err = 0;
 910
 911         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
 912                 for (i = 0; i < ctrls->count; i++) {
 913                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
 914
 915                         err = hdpvr_get_ctrl(&dev->options, ctrl);
 916                         if (err) {
 917                                 ctrls->error_idx = i;
 918                                 break;
 919                         }
 920                 }
 921                 return err;
 922
 923         }
 924
 925         return -EINVAL;
 926 }
 927
 928
 929 static int hdpvr_try_ctrl(struct v4l2_ext_control *ctrl, int ac3)
 930 {
 931         int ret = -EINVAL;
 932
 933         switch (ctrl->id) {
 934         case V4L2_CID_MPEG_AUDIO_ENCODING:
 935                 if (ctrl->value == V4L2_MPEG_AUDIO_ENCODING_AAC ||
 936                     (ac3 && ctrl->value == V4L2_MPEG_AUDIO_ENCODING_AC3))
 937                         ret = 0;
 938                 break;
 939         case V4L2_CID_MPEG_VIDEO_ENCODING:
 940                 if (ctrl->value == V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC)
 941                         ret = 0;
 942                 break;
 943 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
 944 /*              if (ctrl->value == 0 || ctrl->value == 128) */
 945 /*                      ret = 0; */
 946 /*              break; */
 947         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 948                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR ||
 949                     ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR)
 950                         ret = 0;
 951                 break;
 952         case V4L2_CID_MPEG_VIDEO_BITRATE:
 953         {
 954                 uint bitrate = ctrl->value / 100000;
 955                 if (bitrate >= 10 && bitrate <= 135)
 956                         ret = 0;
 957                 break;
 958         }
 959         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 960         {
 961                 uint peak_bitrate = ctrl->value / 100000;
 962                 if (peak_bitrate >= 10 && peak_bitrate <= 202)
 963                         ret = 0;
 964                 break;
 965         }
 966         case V4L2_CID_MPEG_STREAM_TYPE:
 967                 if (ctrl->value == V4L2_MPEG_STREAM_TYPE_MPEG2_TS)
 968                         ret = 0;
 969                 break;
 970         default:
 971                 return -EINVAL;
 972         }
 973         return 0;
 974 }
 975
 976 static int vidioc_try_ext_ctrls(struct file *file, void *priv,
 977                                 struct v4l2_ext_controls *ctrls)
 978 {
 979         struct hdpvr_fh *fh = file->private_data;
 980         struct hdpvr_device *dev = fh->dev;
 981         int i, err = 0;
 982
 983         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
 984                 for (i = 0; i < ctrls->count; i++) {
 985                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
 986
 987                         err = hdpvr_try_ctrl(ctrl,
 988                                              dev->flags & HDPVR_FLAG_AC3_CAP);
 989                         if (err) {
 990                                 ctrls->error_idx = i;
 991                                 break;
 992                         }
 993                 }
 994                 return err;
 995         }
 996
 997         return -EINVAL;
 998 }
 999
1000
1001 static int hdpvr_set_ctrl(struct hdpvr_device *dev,
1002                           struct v4l2_ext_control *ctrl)
1003 {
1004         struct hdpvr_options *opt = &dev->options;
1005         int ret = 0;
1006
1007         switch (ctrl->id) {
1008         case V4L2_CID_MPEG_AUDIO_ENCODING:
1009                 if (dev->flags & HDPVR_FLAG_AC3_CAP) {
1010                         opt->audio_codec = ctrl->value;
1011                         ret = hdpvr_set_audio(dev, opt->audio_input,
1012                                               opt->audio_codec);
1013                 }
1014                 break;
1015         case V4L2_CID_MPEG_VIDEO_ENCODING:
1016                 break;
1017 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
1018 /*              if (ctrl->value == 0 && !(opt->gop_mode & 0x2)) { */
1019 /*                      opt->gop_mode |= 0x2; */
1020 /*                      hdpvr_config_call(dev, CTRL_GOP_MODE_VALUE, */
1021 /*                                        opt->gop_mode); */
1022 /*              } */
1023 /*              if (ctrl->value == 128 && opt->gop_mode & 0x2) { */
1024 /*                      opt->gop_mode &= ~0x2; */
1025 /*                      hdpvr_config_call(dev, CTRL_GOP_MODE_VALUE, */
1026 /*                                        opt->gop_mode); */
1027 /*              } */
1028 /*              break; */
1029         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1030                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR &&
1031                     opt->bitrate_mode != HDPVR_CONSTANT) {
1032                         opt->bitrate_mode = HDPVR_CONSTANT;
1033                         hdpvr_config_call(dev, CTRL_BITRATE_MODE_VALUE,
1034                                           opt->bitrate_mode);
1035                 }
1036                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR &&
1037                     opt->bitrate_mode == HDPVR_CONSTANT) {
1038                         opt->bitrate_mode = HDPVR_VARIABLE_AVERAGE;
1039                         hdpvr_config_call(dev, CTRL_BITRATE_MODE_VALUE,
1040                                           opt->bitrate_mode);
1041                 }
1042                 break;
1043         case V4L2_CID_MPEG_VIDEO_BITRATE: {
1044                 uint bitrate = ctrl->value / 100000;
1045
1046                 opt->bitrate = bitrate;
1047                 if (bitrate >= opt->peak_bitrate)
1048                         opt->peak_bitrate = bitrate+1;
1049
1050                 hdpvr_set_bitrate(dev);
1051                 break;
1052         }
1053         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: {
1054                 uint peak_bitrate = ctrl->value / 100000;
1055
1056                 if (opt->bitrate_mode == HDPVR_CONSTANT)
1057                         break;
1058
1059                 if (opt->bitrate < peak_bitrate) {
1060                         opt->peak_bitrate = peak_bitrate;
1061                         hdpvr_set_bitrate(dev);
1062                 } else
1063                         ret = -EINVAL;
1064                 break;
1065         }
1066         case V4L2_CID_MPEG_STREAM_TYPE:
1067                 break;
1068         default:
1069                 return -EINVAL;
1070         }
1071         return ret;
1072 }
1073
1074 static int vidioc_s_ext_ctrls(struct file *file, void *priv,
1075                               struct v4l2_ext_controls *ctrls)
1076 {
1077         struct hdpvr_fh *fh = file->private_data;
1078         struct hdpvr_device *dev = fh->dev;
1079         int i, err = 0;
1080
1081         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
1082                 for (i = 0; i < ctrls->count; i++) {
1083                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
1084
1085                         err = hdpvr_try_ctrl(ctrl,
1086                                              dev->flags & HDPVR_FLAG_AC3_CAP);
1087                         if (err) {
1088                                 ctrls->error_idx = i;
1089                                 break;
1090                         }
1091                         err = hdpvr_set_ctrl(dev, ctrl);
1092                         if (err) {
1093                                 ctrls->error_idx = i;
1094                                 break;
1095                         }
1096                 }
1097                 return err;
1098
1099         }
1100
1101         return -EINVAL;
1102 }
1103
1104 static int vidioc_enum_fmt_vid_cap(struct file *file, void *private_data,
1105                                     struct v4l2_fmtdesc *f)
1106 {
1107
1108         if (f->index != 0 || f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1109                 return -EINVAL;
1110
1111         f->flags = V4L2_FMT_FLAG_COMPRESSED;
1112         strncpy(f->description, "MPEG2-TS with AVC/AAC streams", 32);
1113         f->pixelformat = V4L2_PIX_FMT_MPEG;
1114
1115         return 0;
1116 }
1117
1118 static int vidioc_g_fmt_vid_cap(struct file *file, void *private_data,
1119                                 struct v4l2_format *f)
1120 {
1121         struct hdpvr_fh *fh = file->private_data;
1122         struct hdpvr_device *dev = fh->dev;
1123         struct hdpvr_video_info *vid_info;
1124
1125         if (!dev)
1126                 return -ENODEV;
1127
1128         vid_info = get_video_info(dev);
1129         if (!vid_info)
1130                 return -EFAULT;
1131
1132         f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1133         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
1134         f->fmt.pix.width        = vid_info->width;
1135         f->fmt.pix.height       = vid_info->height;
1136         f->fmt.pix.sizeimage    = dev->bulk_in_size;
1137         f->fmt.pix.colorspace   = 0;
1138         f->fmt.pix.bytesperline = 0;
1139         f->fmt.pix.field        = V4L2_FIELD_ANY;
1140
1141         kfree(vid_info);
1142         return 0;
1143 }
1144
1145 static int vidioc_encoder_cmd(struct file *filp, void *priv,
1146                                struct v4l2_encoder_cmd *a)
1147 {
1148         struct hdpvr_fh *fh = filp->private_data;
1149         struct hdpvr_device *dev = fh->dev;
1150         int res;
1151
1152         mutex_lock(&dev->io_mutex);
1153
1154         memset(&a->raw, 0, sizeof(a->raw));
1155         switch (a->cmd) {
1156         case V4L2_ENC_CMD_START:
1157                 a->flags = 0;
1158                 res = hdpvr_start_streaming(dev);
1159                 break;
1160         case V4L2_ENC_CMD_STOP:
1161                 res = hdpvr_stop_streaming(dev);
1162                 break;
1163         default:
1164                 v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
1165                          "Unsupported encoder cmd %d\n", a->cmd);
1166                 res = -EINVAL;
1167         }
1168         mutex_unlock(&dev->io_mutex);
1169         return res;
1170 }
1171
1172 static int vidioc_try_encoder_cmd(struct file *filp, void *priv,
1173                                         struct v4l2_encoder_cmd *a)
1174 {
1175         switch (a->cmd) {
1176         case V4L2_ENC_CMD_START:
1177         case V4L2_ENC_CMD_STOP:
1178                 return 0;
1179         default:
1180                 return -EINVAL;
1181         }
1182 }
1183
1184 static const struct v4l2_ioctl_ops hdpvr_ioctl_ops = {
1185         .vidioc_querycap        = vidioc_querycap,
1186         .vidioc_s_std           = vidioc_s_std,
1187         .vidioc_enum_input      = vidioc_enum_input,
1188         .vidioc_g_input         = vidioc_g_input,
1189         .vidioc_s_input         = vidioc_s_input,
1190         .vidioc_enumaudio       = vidioc_enumaudio,
1191         .vidioc_g_audio         = vidioc_g_audio,
1192         .vidioc_s_audio         = vidioc_s_audio,
1193         .vidioc_queryctrl       = vidioc_queryctrl,
1194         .vidioc_g_ctrl          = vidioc_g_ctrl,
1195         .vidioc_s_ctrl          = vidioc_s_ctrl,
1196         .vidioc_g_ext_ctrls     = vidioc_g_ext_ctrls,
1197         .vidioc_s_ext_ctrls     = vidioc_s_ext_ctrls,
1198         .vidioc_try_ext_ctrls   = vidioc_try_ext_ctrls,
1199         .vidioc_enum_fmt_vid_cap        = vidioc_enum_fmt_vid_cap,
1200         .vidioc_g_fmt_vid_cap           = vidioc_g_fmt_vid_cap,
1201         .vidioc_encoder_cmd     = vidioc_encoder_cmd,
1202         .vidioc_try_encoder_cmd = vidioc_try_encoder_cmd,
1203 };
1204
1205 static void hdpvr_device_release(struct video_device *vdev)
1206 {
1207         struct hdpvr_device *dev = video_get_drvdata(vdev);
1208
1209         hdpvr_delete(dev);
1210 }
1211
1212 static const struct video_device hdpvr_video_template = {
1213 /*      .type                   = VFL_TYPE_GRABBER, */
1214 /*      .type2                  = VID_TYPE_CAPTURE | VID_TYPE_MPEG_ENCODER, */
1215         .fops                   = &hdpvr_fops,
1216         .release                = hdpvr_device_release,
1217         .ioctl_ops              = &hdpvr_ioctl_ops,
1218         .tvnorms                =
1219                 V4L2_STD_NTSC  | V4L2_STD_SECAM | V4L2_STD_PAL_B |
1220                 V4L2_STD_PAL_G | V4L2_STD_PAL_H | V4L2_STD_PAL_I |
1221                 V4L2_STD_PAL_D | V4L2_STD_PAL_M | V4L2_STD_PAL_N |
1222                 V4L2_STD_PAL_60,
1223 };
1224
1225 int hdpvr_register_videodev(struct hdpvr_device *dev, struct device *parent,
1226                             int devnum)
1227 {
1228         /* setup and register video device */
1229         dev->video_dev = video_device_alloc();
1230         if (!dev->video_dev) {
1231                 v4l2_err(&dev->v4l2_dev, "video_device_alloc() failed\n");
1232                 goto error;
1233         }
1234
1235         *(dev->video_dev) = hdpvr_video_template;
1236         strcpy(dev->video_dev->name, "Hauppauge HD PVR");
1237         dev->video_dev->parent = parent;
1238         video_set_drvdata(dev->video_dev, dev);
1239
1240         if (video_register_device(dev->video_dev, VFL_TYPE_GRABBER, devnum)) {
1241                 v4l2_err(&dev->v4l2_dev, "video_device registration failed\n");
1242                 goto error;
1243         }
1244
1245         return 0;
1246 error:
1247         return -ENOMEM;
1248 }