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_urb;
 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_urb_buffer;
 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_urb_buffer:
 165         usb_free_urb(urb);
 166 exit_urb:
 167         kfree(buf);
 168 exit:
 169         hdpvr_free_buffers(dev);
 170         return retval;
 171 }
 172
 173 static int hdpvr_submit_buffers(struct hdpvr_device *dev)
 174 {
 175         struct hdpvr_buffer *buf;
 176         struct urb *urb;
 177         int ret = 0, err_count = 0;
 178
 179         mutex_lock(&dev->io_mutex);
 180
 181         while (dev->status == STATUS_STREAMING &&
 182                !list_empty(&dev->free_buff_list)) {
 183
 184                 buf = list_entry(dev->free_buff_list.next, struct hdpvr_buffer,
 185                                  buff_list);
 186                 if (buf->status != BUFSTAT_AVAILABLE) {
 187                         v4l2_err(&dev->v4l2_dev,
 188                                  "buffer not marked as available\n");
 189                         ret = -EFAULT;
 190                         goto err;
 191                 }
 192
 193                 urb = buf->urb;
 194                 urb->status = 0;
 195                 urb->actual_length = 0;
 196                 ret = usb_submit_urb(urb, GFP_KERNEL);
 197                 if (ret) {
 198                         v4l2_err(&dev->v4l2_dev,
 199                                  "usb_submit_urb in %s returned %d\n",
 200                                  __func__, ret);
 201                         if (++err_count > 2)
 202                                 break;
 203                         continue;
 204                 }
 205                 buf->status = BUFSTAT_INPROGRESS;
 206                 list_move_tail(&buf->buff_list, &dev->rec_buff_list);
 207         }
 208 err:
 209         print_buffer_status();
 210         mutex_unlock(&dev->io_mutex);
 211         return ret;
 212 }
 213
 214 static struct hdpvr_buffer *hdpvr_get_next_buffer(struct hdpvr_device *dev)
 215 {
 216         struct hdpvr_buffer *buf;
 217
 218         mutex_lock(&dev->io_mutex);
 219
 220         if (list_empty(&dev->rec_buff_list)) {
 221                 mutex_unlock(&dev->io_mutex);
 222                 return NULL;
 223         }
 224
 225         buf = list_entry(dev->rec_buff_list.next, struct hdpvr_buffer,
 226                          buff_list);
 227         mutex_unlock(&dev->io_mutex);
 228
 229         return buf;
 230 }
 231
 232 static void hdpvr_transmit_buffers(struct work_struct *work)
 233 {
 234         struct hdpvr_device *dev = container_of(work, struct hdpvr_device,
 235                                                 worker);
 236
 237         while (dev->status == STATUS_STREAMING) {
 238
 239                 if (hdpvr_submit_buffers(dev)) {
 240                         v4l2_err(&dev->v4l2_dev, "couldn't submit buffers\n");
 241                         goto error;
 242                 }
 243                 if (wait_event_interruptible(dev->wait_buffer,
 244                                 !list_empty(&dev->free_buff_list) ||
 245                                              dev->status != STATUS_STREAMING))
 246                         goto error;
 247         }
 248
 249         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 250                  "transmit worker exited\n");
 251         return;
 252 error:
 253         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 254                  "transmit buffers errored\n");
 255         dev->status = STATUS_ERROR;
 256 }
 257
 258 /* function expects dev->io_mutex to be hold by caller */
 259 static int hdpvr_start_streaming(struct hdpvr_device *dev)
 260 {
 261         int ret;
 262         struct hdpvr_video_info *vidinf;
 263
 264         if (dev->status == STATUS_STREAMING)
 265                 return 0;
 266         else if (dev->status != STATUS_IDLE)
 267                 return -EAGAIN;
 268
 269         vidinf = get_video_info(dev);
 270
 271         if (vidinf) {
 272                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 273                          "video signal: %dx%d@%dhz\n", vidinf->width,
 274                          vidinf->height, vidinf->fps);
 275                 kfree(vidinf);
 276
 277                 /* start streaming 2 request */
 278                 ret = usb_control_msg(dev->udev,
 279                                       usb_sndctrlpipe(dev->udev, 0),
 280                                       0xb8, 0x38, 0x1, 0, NULL, 0, 8000);
 281                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 282                          "encoder start control request returned %d\n", ret);
 283
 284                 hdpvr_config_call(dev, CTRL_START_STREAMING_VALUE, 0x00);
 285
 286                 INIT_WORK(&dev->worker, hdpvr_transmit_buffers);
 287                 queue_work(dev->workqueue, &dev->worker);
 288
 289                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 290                          "streaming started\n");
 291                 dev->status = STATUS_STREAMING;
 292
 293                 return 0;
 294         }
 295         msleep(250);
 296         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 297                  "no video signal at input %d\n", dev->options.video_input);
 298         return -EAGAIN;
 299 }
 300
 301
 302 /* function expects dev->io_mutex to be hold by caller */
 303 static int hdpvr_stop_streaming(struct hdpvr_device *dev)
 304 {
 305         uint actual_length, c = 0;
 306         u8 *buf;
 307
 308         if (dev->status == STATUS_IDLE)
 309                 return 0;
 310         else if (dev->status != STATUS_STREAMING)
 311                 return -EAGAIN;
 312
 313         buf = kmalloc(dev->bulk_in_size, GFP_KERNEL);
 314         if (!buf)
 315                 v4l2_err(&dev->v4l2_dev, "failed to allocate temporary buffer "
 316                          "for emptying the internal device buffer. "
 317                          "Next capture start will be slow\n");
 318
 319         dev->status = STATUS_SHUTTING_DOWN;
 320         hdpvr_config_call(dev, CTRL_STOP_STREAMING_VALUE, 0x00);
 321         mutex_unlock(&dev->io_mutex);
 322
 323         wake_up_interruptible(&dev->wait_buffer);
 324         msleep(50);
 325
 326         flush_workqueue(dev->workqueue);
 327
 328         mutex_lock(&dev->io_mutex);
 329         /* kill the still outstanding urbs */
 330         hdpvr_cancel_queue(dev);
 331
 332         /* emptying the device buffer beforeshutting it down */
 333         while (buf && ++c < 500 &&
 334                !usb_bulk_msg(dev->udev,
 335                              usb_rcvbulkpipe(dev->udev,
 336                                              dev->bulk_in_endpointAddr),
 337                              buf, dev->bulk_in_size, &actual_length,
 338                              BULK_URB_TIMEOUT)) {
 339                 /* wait */
 340                 msleep(5);
 341                 v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 342                          "%2d: got %d bytes\n", c, actual_length);
 343         }
 344         kfree(buf);
 345         v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 346                  "used %d urbs to empty device buffers\n", c-1);
 347         msleep(10);
 348
 349         dev->status = STATUS_IDLE;
 350
 351         return 0;
 352 }
 353
 354
 355 /*=======================================================================*/
 356 /*
 357  * video 4 linux 2 file operations
 358  */
 359
 360 static int hdpvr_open(struct file *file)
 361 {
 362         struct hdpvr_device *dev;
 363         struct hdpvr_fh *fh;
 364         int retval = -ENOMEM;
 365
 366         dev = (struct hdpvr_device *)video_get_drvdata(video_devdata(file));
 367         if (!dev) {
 368                 v4l2_err(&dev->v4l2_dev, "open failing with with ENODEV\n");
 369                 retval = -ENODEV;
 370                 goto err;
 371         }
 372
 373         fh = kzalloc(sizeof(struct hdpvr_fh), GFP_KERNEL);
 374         if (!fh) {
 375                 v4l2_err(&dev->v4l2_dev, "Out of memory\n");
 376                 goto err;
 377         }
 378         /* lock the device to allow correctly handling errors
 379          * in resumption */
 380         mutex_lock(&dev->io_mutex);
 381         dev->open_count++;
 382         mutex_unlock(&dev->io_mutex);
 383
 384         fh->dev = dev;
 385
 386         /* save our object in the file's private structure */
 387         file->private_data = fh;
 388
 389         retval = 0;
 390 err:
 391         return retval;
 392 }
 393
 394 static int hdpvr_release(struct file *file)
 395 {
 396         struct hdpvr_fh         *fh  = (struct hdpvr_fh *)file->private_data;
 397         struct hdpvr_device     *dev = fh->dev;
 398
 399         if (!dev)
 400                 return -ENODEV;
 401
 402         mutex_lock(&dev->io_mutex);
 403         if (!(--dev->open_count) && dev->status == STATUS_STREAMING)
 404                 hdpvr_stop_streaming(dev);
 405
 406         mutex_unlock(&dev->io_mutex);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * hdpvr_v4l2_read()
 413  * will allocate buffers when called for the first time
 414  */
 415 static ssize_t hdpvr_read(struct file *file, char __user *buffer, size_t count,
 416                           loff_t *pos)
 417 {
 418         struct hdpvr_fh *fh = file->private_data;
 419         struct hdpvr_device *dev = fh->dev;
 420         struct hdpvr_buffer *buf = NULL;
 421         struct urb *urb;
 422         unsigned int ret = 0;
 423         int rem, cnt;
 424
 425         if (*pos)
 426                 return -ESPIPE;
 427
 428         if (!dev)
 429                 return -ENODEV;
 430
 431         mutex_lock(&dev->io_mutex);
 432         if (dev->status == STATUS_IDLE) {
 433                 if (hdpvr_start_streaming(dev)) {
 434                         v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 435                                  "start_streaming failed\n");
 436                         ret = -EIO;
 437                         msleep(200);
 438                         dev->status = STATUS_IDLE;
 439                         mutex_unlock(&dev->io_mutex);
 440                         goto err;
 441                 }
 442                 print_buffer_status();
 443         }
 444         mutex_unlock(&dev->io_mutex);
 445
 446         /* wait for the first buffer */
 447         if (!(file->f_flags & O_NONBLOCK)) {
 448                 if (wait_event_interruptible(dev->wait_data,
 449                                              hdpvr_get_next_buffer(dev)))
 450                         return -ERESTARTSYS;
 451         }
 452
 453         buf = hdpvr_get_next_buffer(dev);
 454
 455         while (count > 0 && buf) {
 456
 457                 if (buf->status != BUFSTAT_READY &&
 458                     dev->status != STATUS_DISCONNECTED) {
 459                         /* return nonblocking */
 460                         if (file->f_flags & O_NONBLOCK) {
 461                                 if (!ret)
 462                                         ret = -EAGAIN;
 463                                 goto err;
 464                         }
 465
 466                         if (wait_event_interruptible(dev->wait_data,
 467                                               buf->status == BUFSTAT_READY)) {
 468                                 ret = -ERESTARTSYS;
 469                                 goto err;
 470                         }
 471                 }
 472
 473                 if (buf->status != BUFSTAT_READY)
 474                         break;
 475
 476                 /* set remaining bytes to copy */
 477                 urb = buf->urb;
 478                 rem = urb->actual_length - buf->pos;
 479                 cnt = rem > count ? count : rem;
 480
 481                 if (copy_to_user(buffer, urb->transfer_buffer + buf->pos,
 482                                  cnt)) {
 483                         v4l2_err(&dev->v4l2_dev, "read: copy_to_user failed\n");
 484                         if (!ret)
 485                                 ret = -EFAULT;
 486                         goto err;
 487                 }
 488
 489                 buf->pos += cnt;
 490                 count -= cnt;
 491                 buffer += cnt;
 492                 ret += cnt;
 493
 494                 /* finished, take next buffer */
 495                 if (buf->pos == urb->actual_length) {
 496                         mutex_lock(&dev->io_mutex);
 497                         buf->pos = 0;
 498                         buf->status = BUFSTAT_AVAILABLE;
 499
 500                         list_move_tail(&buf->buff_list, &dev->free_buff_list);
 501
 502                         print_buffer_status();
 503
 504                         mutex_unlock(&dev->io_mutex);
 505
 506                         wake_up_interruptible(&dev->wait_buffer);
 507
 508                         buf = hdpvr_get_next_buffer(dev);
 509                 }
 510         }
 511 err:
 512         if (!ret && !buf)
 513                 ret = -EAGAIN;
 514         return ret;
 515 }
 516
 517 static unsigned int hdpvr_poll(struct file *filp, poll_table *wait)
 518 {
 519         struct hdpvr_buffer *buf = NULL;
 520         struct hdpvr_fh *fh = (struct hdpvr_fh *)filp->private_data;
 521         struct hdpvr_device *dev = fh->dev;
 522         unsigned int mask = 0;
 523
 524         mutex_lock(&dev->io_mutex);
 525
 526         if (video_is_unregistered(dev->video_dev)) {
 527                 mutex_unlock(&dev->io_mutex);
 528                 return -EIO;
 529         }
 530
 531         if (dev->status == STATUS_IDLE) {
 532                 if (hdpvr_start_streaming(dev)) {
 533                         v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
 534                                  "start_streaming failed\n");
 535                         dev->status = STATUS_IDLE;
 536                 }
 537
 538                 print_buffer_status();
 539         }
 540         mutex_unlock(&dev->io_mutex);
 541
 542         buf = hdpvr_get_next_buffer(dev);
 543         /* only wait if no data is available */
 544         if (!buf || buf->status != BUFSTAT_READY) {
 545                 poll_wait(filp, &dev->wait_data, wait);
 546                 buf = hdpvr_get_next_buffer(dev);
 547         }
 548         if (buf && buf->status == BUFSTAT_READY)
 549                 mask |= POLLIN | POLLRDNORM;
 550
 551         return mask;
 552 }
 553
 554
 555 static const struct v4l2_file_operations hdpvr_fops = {
 556         .owner          = THIS_MODULE,
 557         .open           = hdpvr_open,
 558         .release        = hdpvr_release,
 559         .read           = hdpvr_read,
 560         .poll           = hdpvr_poll,
 561         .unlocked_ioctl = video_ioctl2,
 562 };
 563
 564 /*=======================================================================*/
 565 /*
 566  * V4L2 ioctl handling
 567  */
 568
 569 static int vidioc_querycap(struct file *file, void  *priv,
 570                            struct v4l2_capability *cap)
 571 {
 572         struct hdpvr_device *dev = video_drvdata(file);
 573
 574         strcpy(cap->driver, "hdpvr");
 575         strcpy(cap->card, "Haupauge HD PVR");
 576         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 577         cap->version = HDPVR_VERSION;
 578         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 579                                 V4L2_CAP_AUDIO         |
 580                                 V4L2_CAP_READWRITE;
 581         return 0;
 582 }
 583
 584 static int vidioc_s_std(struct file *file, void *private_data,
 585                         v4l2_std_id *std)
 586 {
 587         struct hdpvr_fh *fh = file->private_data;
 588         struct hdpvr_device *dev = fh->dev;
 589         u8 std_type = 1;
 590
 591         if (*std & (V4L2_STD_NTSC | V4L2_STD_PAL_60))
 592                 std_type = 0;
 593
 594         return hdpvr_config_call(dev, CTRL_VIDEO_STD_TYPE, std_type);
 595 }
 596
 597 static const char *iname[] = {
 598         [HDPVR_COMPONENT] = "Component",
 599         [HDPVR_SVIDEO]    = "S-Video",
 600         [HDPVR_COMPOSITE] = "Composite",
 601 };
 602
 603 static int vidioc_enum_input(struct file *file, void *priv,
 604                                 struct v4l2_input *i)
 605 {
 606         struct hdpvr_fh *fh = file->private_data;
 607         struct hdpvr_device *dev = fh->dev;
 608         unsigned int n;
 609
 610         n = i->index;
 611         if (n >= HDPVR_VIDEO_INPUTS)
 612                 return -EINVAL;
 613
 614         i->type = V4L2_INPUT_TYPE_CAMERA;
 615
 616         strncpy(i->name, iname[n], sizeof(i->name) - 1);
 617         i->name[sizeof(i->name) - 1] = '\0';
 618
 619         i->audioset = 1<<HDPVR_RCA_FRONT | 1<<HDPVR_RCA_BACK | 1<<HDPVR_SPDIF;
 620
 621         i->std = dev->video_dev->tvnorms;
 622
 623         return 0;
 624 }
 625
 626 static int vidioc_s_input(struct file *file, void *private_data,
 627                           unsigned int index)
 628 {
 629         struct hdpvr_fh *fh = file->private_data;
 630         struct hdpvr_device *dev = fh->dev;
 631         int retval;
 632
 633         if (index >= HDPVR_VIDEO_INPUTS)
 634                 return -EINVAL;
 635
 636         if (dev->status != STATUS_IDLE)
 637                 return -EAGAIN;
 638
 639         retval = hdpvr_config_call(dev, CTRL_VIDEO_INPUT_VALUE, index+1);
 640         if (!retval)
 641                 dev->options.video_input = index;
 642
 643         return retval;
 644 }
 645
 646 static int vidioc_g_input(struct file *file, void *private_data,
 647                           unsigned int *index)
 648 {
 649         struct hdpvr_fh *fh = file->private_data;
 650         struct hdpvr_device *dev = fh->dev;
 651
 652         *index = dev->options.video_input;
 653         return 0;
 654 }
 655
 656
 657 static const char *audio_iname[] = {
 658         [HDPVR_RCA_FRONT] = "RCA front",
 659         [HDPVR_RCA_BACK]  = "RCA back",
 660         [HDPVR_SPDIF]     = "SPDIF",
 661 };
 662
 663 static int vidioc_enumaudio(struct file *file, void *priv,
 664                                 struct v4l2_audio *audio)
 665 {
 666         unsigned int n;
 667
 668         n = audio->index;
 669         if (n >= HDPVR_AUDIO_INPUTS)
 670                 return -EINVAL;
 671
 672         audio->capability = V4L2_AUDCAP_STEREO;
 673
 674         strncpy(audio->name, audio_iname[n], sizeof(audio->name) - 1);
 675         audio->name[sizeof(audio->name) - 1] = '\0';
 676
 677         return 0;
 678 }
 679
 680 static int vidioc_s_audio(struct file *file, void *private_data,
 681                           struct v4l2_audio *audio)
 682 {
 683         struct hdpvr_fh *fh = file->private_data;
 684         struct hdpvr_device *dev = fh->dev;
 685         int retval;
 686
 687         if (audio->index >= HDPVR_AUDIO_INPUTS)
 688                 return -EINVAL;
 689
 690         if (dev->status != STATUS_IDLE)
 691                 return -EAGAIN;
 692
 693         retval = hdpvr_set_audio(dev, audio->index+1, dev->options.audio_codec);
 694         if (!retval)
 695                 dev->options.audio_input = audio->index;
 696
 697         return retval;
 698 }
 699
 700 static int vidioc_g_audio(struct file *file, void *private_data,
 701                           struct v4l2_audio *audio)
 702 {
 703         struct hdpvr_fh *fh = file->private_data;
 704         struct hdpvr_device *dev = fh->dev;
 705
 706         audio->index = dev->options.audio_input;
 707         audio->capability = V4L2_AUDCAP_STEREO;
 708         strncpy(audio->name, audio_iname[audio->index], sizeof(audio->name));
 709         audio->name[sizeof(audio->name) - 1] = '\0';
 710         return 0;
 711 }
 712
 713 static const s32 supported_v4l2_ctrls[] = {
 714         V4L2_CID_BRIGHTNESS,
 715         V4L2_CID_CONTRAST,
 716         V4L2_CID_SATURATION,
 717         V4L2_CID_HUE,
 718         V4L2_CID_SHARPNESS,
 719         V4L2_CID_MPEG_AUDIO_ENCODING,
 720         V4L2_CID_MPEG_VIDEO_ENCODING,
 721         V4L2_CID_MPEG_VIDEO_BITRATE_MODE,
 722         V4L2_CID_MPEG_VIDEO_BITRATE,
 723         V4L2_CID_MPEG_VIDEO_BITRATE_PEAK,
 724 };
 725
 726 static int fill_queryctrl(struct hdpvr_options *opt, struct v4l2_queryctrl *qc,
 727                           int ac3)
 728 {
 729         int err;
 730
 731         switch (qc->id) {
 732         case V4L2_CID_BRIGHTNESS:
 733                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x86);
 734         case V4L2_CID_CONTRAST:
 735                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 736         case V4L2_CID_SATURATION:
 737                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 738         case V4L2_CID_HUE:
 739                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 740         case V4L2_CID_SHARPNESS:
 741                 return v4l2_ctrl_query_fill(qc, 0x0, 0xff, 1, 0x80);
 742         case V4L2_CID_MPEG_AUDIO_ENCODING:
 743                 return v4l2_ctrl_query_fill(
 744                         qc, V4L2_MPEG_AUDIO_ENCODING_AAC,
 745                         ac3 ? V4L2_MPEG_AUDIO_ENCODING_AC3
 746                         : V4L2_MPEG_AUDIO_ENCODING_AAC,
 747                         1, V4L2_MPEG_AUDIO_ENCODING_AAC);
 748         case V4L2_CID_MPEG_VIDEO_ENCODING:
 749                 return v4l2_ctrl_query_fill(
 750                         qc, V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC,
 751                         V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC, 1,
 752                         V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC);
 753
 754 /*      case V4L2_CID_MPEG_VIDEO_? maybe keyframe interval: */
 755 /*              return v4l2_ctrl_query_fill(qc, 0, 128, 128, 0); */
 756         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 757                 return v4l2_ctrl_query_fill(
 758                         qc, V4L2_MPEG_VIDEO_BITRATE_MODE_VBR,
 759                         V4L2_MPEG_VIDEO_BITRATE_MODE_CBR, 1,
 760                         V4L2_MPEG_VIDEO_BITRATE_MODE_CBR);
 761
 762         case V4L2_CID_MPEG_VIDEO_BITRATE:
 763                 return v4l2_ctrl_query_fill(qc, 1000000, 13500000, 100000,
 764                                             6500000);
 765         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 766                 err = v4l2_ctrl_query_fill(qc, 1100000, 20200000, 100000,
 767                                            9000000);
 768                 if (!err && opt->bitrate_mode == HDPVR_CONSTANT)
 769                         qc->flags |= V4L2_CTRL_FLAG_INACTIVE;
 770                 return err;
 771         default:
 772                 return -EINVAL;
 773         }
 774 }
 775
 776 static int vidioc_queryctrl(struct file *file, void *private_data,
 777                             struct v4l2_queryctrl *qc)
 778 {
 779         struct hdpvr_fh *fh = file->private_data;
 780         struct hdpvr_device *dev = fh->dev;
 781         int i, next;
 782         u32 id = qc->id;
 783
 784         memset(qc, 0, sizeof(*qc));
 785
 786         next = !!(id &  V4L2_CTRL_FLAG_NEXT_CTRL);
 787         qc->id = id & ~V4L2_CTRL_FLAG_NEXT_CTRL;
 788
 789         for (i = 0; i < ARRAY_SIZE(supported_v4l2_ctrls); i++) {
 790                 if (next) {
 791                         if (qc->id < supported_v4l2_ctrls[i])
 792                                 qc->id = supported_v4l2_ctrls[i];
 793                         else
 794                                 continue;
 795                 }
 796
 797                 if (qc->id == supported_v4l2_ctrls[i])
 798                         return fill_queryctrl(&dev->options, qc,
 799                                               dev->flags & HDPVR_FLAG_AC3_CAP);
 800
 801                 if (qc->id < supported_v4l2_ctrls[i])
 802                         break;
 803         }
 804
 805         return -EINVAL;
 806 }
 807
 808 static int vidioc_g_ctrl(struct file *file, void *private_data,
 809                          struct v4l2_control *ctrl)
 810 {
 811         struct hdpvr_fh *fh = file->private_data;
 812         struct hdpvr_device *dev = fh->dev;
 813
 814         switch (ctrl->id) {
 815         case V4L2_CID_BRIGHTNESS:
 816                 ctrl->value = dev->options.brightness;
 817                 break;
 818         case V4L2_CID_CONTRAST:
 819                 ctrl->value = dev->options.contrast;
 820                 break;
 821         case V4L2_CID_SATURATION:
 822                 ctrl->value = dev->options.saturation;
 823                 break;
 824         case V4L2_CID_HUE:
 825                 ctrl->value = dev->options.hue;
 826                 break;
 827         case V4L2_CID_SHARPNESS:
 828                 ctrl->value = dev->options.sharpness;
 829                 break;
 830         default:
 831                 return -EINVAL;
 832         }
 833         return 0;
 834 }
 835
 836 static int vidioc_s_ctrl(struct file *file, void *private_data,
 837                          struct v4l2_control *ctrl)
 838 {
 839         struct hdpvr_fh *fh = file->private_data;
 840         struct hdpvr_device *dev = fh->dev;
 841         int retval;
 842
 843         switch (ctrl->id) {
 844         case V4L2_CID_BRIGHTNESS:
 845                 retval = hdpvr_config_call(dev, CTRL_BRIGHTNESS, ctrl->value);
 846                 if (!retval)
 847                         dev->options.brightness = ctrl->value;
 848                 break;
 849         case V4L2_CID_CONTRAST:
 850                 retval = hdpvr_config_call(dev, CTRL_CONTRAST, ctrl->value);
 851                 if (!retval)
 852                         dev->options.contrast = ctrl->value;
 853                 break;
 854         case V4L2_CID_SATURATION:
 855                 retval = hdpvr_config_call(dev, CTRL_SATURATION, ctrl->value);
 856                 if (!retval)
 857                         dev->options.saturation = ctrl->value;
 858                 break;
 859         case V4L2_CID_HUE:
 860                 retval = hdpvr_config_call(dev, CTRL_HUE, ctrl->value);
 861                 if (!retval)
 862                         dev->options.hue = ctrl->value;
 863                 break;
 864         case V4L2_CID_SHARPNESS:
 865                 retval = hdpvr_config_call(dev, CTRL_SHARPNESS, ctrl->value);
 866                 if (!retval)
 867                         dev->options.sharpness = ctrl->value;
 868                 break;
 869         default:
 870                 return -EINVAL;
 871         }
 872
 873         return retval;
 874 }
 875
 876
 877 static int hdpvr_get_ctrl(struct hdpvr_options *opt,
 878                           struct v4l2_ext_control *ctrl)
 879 {
 880         switch (ctrl->id) {
 881         case V4L2_CID_MPEG_AUDIO_ENCODING:
 882                 ctrl->value = opt->audio_codec;
 883                 break;
 884         case V4L2_CID_MPEG_VIDEO_ENCODING:
 885                 ctrl->value = V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC;
 886                 break;
 887 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
 888 /*              ctrl->value = (opt->gop_mode & 0x2) ? 0 : 128; */
 889 /*              break; */
 890         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 891                 ctrl->value = opt->bitrate_mode == HDPVR_CONSTANT
 892                         ? V4L2_MPEG_VIDEO_BITRATE_MODE_CBR
 893                         : V4L2_MPEG_VIDEO_BITRATE_MODE_VBR;
 894                 break;
 895         case V4L2_CID_MPEG_VIDEO_BITRATE:
 896                 ctrl->value = opt->bitrate * 100000;
 897                 break;
 898         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 899                 ctrl->value = opt->peak_bitrate * 100000;
 900                 break;
 901         case V4L2_CID_MPEG_STREAM_TYPE:
 902                 ctrl->value = V4L2_MPEG_STREAM_TYPE_MPEG2_TS;
 903                 break;
 904         default:
 905                 return -EINVAL;
 906         }
 907         return 0;
 908 }
 909
 910 static int vidioc_g_ext_ctrls(struct file *file, void *priv,
 911                               struct v4l2_ext_controls *ctrls)
 912 {
 913         struct hdpvr_fh *fh = file->private_data;
 914         struct hdpvr_device *dev = fh->dev;
 915         int i, err = 0;
 916
 917         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
 918                 for (i = 0; i < ctrls->count; i++) {
 919                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
 920
 921                         err = hdpvr_get_ctrl(&dev->options, ctrl);
 922                         if (err) {
 923                                 ctrls->error_idx = i;
 924                                 break;
 925                         }
 926                 }
 927                 return err;
 928
 929         }
 930
 931         return -EINVAL;
 932 }
 933
 934
 935 static int hdpvr_try_ctrl(struct v4l2_ext_control *ctrl, int ac3)
 936 {
 937         int ret = -EINVAL;
 938
 939         switch (ctrl->id) {
 940         case V4L2_CID_MPEG_AUDIO_ENCODING:
 941                 if (ctrl->value == V4L2_MPEG_AUDIO_ENCODING_AAC ||
 942                     (ac3 && ctrl->value == V4L2_MPEG_AUDIO_ENCODING_AC3))
 943                         ret = 0;
 944                 break;
 945         case V4L2_CID_MPEG_VIDEO_ENCODING:
 946                 if (ctrl->value == V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC)
 947                         ret = 0;
 948                 break;
 949 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
 950 /*              if (ctrl->value == 0 || ctrl->value == 128) */
 951 /*                      ret = 0; */
 952 /*              break; */
 953         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 954                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR ||
 955                     ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR)
 956                         ret = 0;
 957                 break;
 958         case V4L2_CID_MPEG_VIDEO_BITRATE:
 959         {
 960                 uint bitrate = ctrl->value / 100000;
 961                 if (bitrate >= 10 && bitrate <= 135)
 962                         ret = 0;
 963                 break;
 964         }
 965         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 966         {
 967                 uint peak_bitrate = ctrl->value / 100000;
 968                 if (peak_bitrate >= 10 && peak_bitrate <= 202)
 969                         ret = 0;
 970                 break;
 971         }
 972         case V4L2_CID_MPEG_STREAM_TYPE:
 973                 if (ctrl->value == V4L2_MPEG_STREAM_TYPE_MPEG2_TS)
 974                         ret = 0;
 975                 break;
 976         default:
 977                 return -EINVAL;
 978         }
 979         return 0;
 980 }
 981
 982 static int vidioc_try_ext_ctrls(struct file *file, void *priv,
 983                                 struct v4l2_ext_controls *ctrls)
 984 {
 985         struct hdpvr_fh *fh = file->private_data;
 986         struct hdpvr_device *dev = fh->dev;
 987         int i, err = 0;
 988
 989         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
 990                 for (i = 0; i < ctrls->count; i++) {
 991                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
 992
 993                         err = hdpvr_try_ctrl(ctrl,
 994                                              dev->flags & HDPVR_FLAG_AC3_CAP);
 995                         if (err) {
 996                                 ctrls->error_idx = i;
 997                                 break;
 998                         }
 999                 }
1000                 return err;
1001         }
1002
1003         return -EINVAL;
1004 }
1005
1006
1007 static int hdpvr_set_ctrl(struct hdpvr_device *dev,
1008                           struct v4l2_ext_control *ctrl)
1009 {
1010         struct hdpvr_options *opt = &dev->options;
1011         int ret = 0;
1012
1013         switch (ctrl->id) {
1014         case V4L2_CID_MPEG_AUDIO_ENCODING:
1015                 if (dev->flags & HDPVR_FLAG_AC3_CAP) {
1016                         opt->audio_codec = ctrl->value;
1017                         ret = hdpvr_set_audio(dev, opt->audio_input,
1018                                               opt->audio_codec);
1019                 }
1020                 break;
1021         case V4L2_CID_MPEG_VIDEO_ENCODING:
1022                 break;
1023 /*      case V4L2_CID_MPEG_VIDEO_B_FRAMES: */
1024 /*              if (ctrl->value == 0 && !(opt->gop_mode & 0x2)) { */
1025 /*                      opt->gop_mode |= 0x2; */
1026 /*                      hdpvr_config_call(dev, CTRL_GOP_MODE_VALUE, */
1027 /*                                        opt->gop_mode); */
1028 /*              } */
1029 /*              if (ctrl->value == 128 && opt->gop_mode & 0x2) { */
1030 /*                      opt->gop_mode &= ~0x2; */
1031 /*                      hdpvr_config_call(dev, CTRL_GOP_MODE_VALUE, */
1032 /*                                        opt->gop_mode); */
1033 /*              } */
1034 /*              break; */
1035         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1036                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR &&
1037                     opt->bitrate_mode != HDPVR_CONSTANT) {
1038                         opt->bitrate_mode = HDPVR_CONSTANT;
1039                         hdpvr_config_call(dev, CTRL_BITRATE_MODE_VALUE,
1040                                           opt->bitrate_mode);
1041                 }
1042                 if (ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR &&
1043                     opt->bitrate_mode == HDPVR_CONSTANT) {
1044                         opt->bitrate_mode = HDPVR_VARIABLE_AVERAGE;
1045                         hdpvr_config_call(dev, CTRL_BITRATE_MODE_VALUE,
1046                                           opt->bitrate_mode);
1047                 }
1048                 break;
1049         case V4L2_CID_MPEG_VIDEO_BITRATE: {
1050                 uint bitrate = ctrl->value / 100000;
1051
1052                 opt->bitrate = bitrate;
1053                 if (bitrate >= opt->peak_bitrate)
1054                         opt->peak_bitrate = bitrate+1;
1055
1056                 hdpvr_set_bitrate(dev);
1057                 break;
1058         }
1059         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: {
1060                 uint peak_bitrate = ctrl->value / 100000;
1061
1062                 if (opt->bitrate_mode == HDPVR_CONSTANT)
1063                         break;
1064
1065                 if (opt->bitrate < peak_bitrate) {
1066                         opt->peak_bitrate = peak_bitrate;
1067                         hdpvr_set_bitrate(dev);
1068                 } else
1069                         ret = -EINVAL;
1070                 break;
1071         }
1072         case V4L2_CID_MPEG_STREAM_TYPE:
1073                 break;
1074         default:
1075                 return -EINVAL;
1076         }
1077         return ret;
1078 }
1079
1080 static int vidioc_s_ext_ctrls(struct file *file, void *priv,
1081                               struct v4l2_ext_controls *ctrls)
1082 {
1083         struct hdpvr_fh *fh = file->private_data;
1084         struct hdpvr_device *dev = fh->dev;
1085         int i, err = 0;
1086
1087         if (ctrls->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
1088                 for (i = 0; i < ctrls->count; i++) {
1089                         struct v4l2_ext_control *ctrl = ctrls->controls + i;
1090
1091                         err = hdpvr_try_ctrl(ctrl,
1092                                              dev->flags & HDPVR_FLAG_AC3_CAP);
1093                         if (err) {
1094                                 ctrls->error_idx = i;
1095                                 break;
1096                         }
1097                         err = hdpvr_set_ctrl(dev, ctrl);
1098                         if (err) {
1099                                 ctrls->error_idx = i;
1100                                 break;
1101                         }
1102                 }
1103                 return err;
1104
1105         }
1106
1107         return -EINVAL;
1108 }
1109
1110 static int vidioc_enum_fmt_vid_cap(struct file *file, void *private_data,
1111                                     struct v4l2_fmtdesc *f)
1112 {
1113
1114         if (f->index != 0 || f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1115                 return -EINVAL;
1116
1117         f->flags = V4L2_FMT_FLAG_COMPRESSED;
1118         strncpy(f->description, "MPEG2-TS with AVC/AAC streams", 32);
1119         f->pixelformat = V4L2_PIX_FMT_MPEG;
1120
1121         return 0;
1122 }
1123
1124 static int vidioc_g_fmt_vid_cap(struct file *file, void *private_data,
1125                                 struct v4l2_format *f)
1126 {
1127         struct hdpvr_fh *fh = file->private_data;
1128         struct hdpvr_device *dev = fh->dev;
1129         struct hdpvr_video_info *vid_info;
1130
1131         if (!dev)
1132                 return -ENODEV;
1133
1134         vid_info = get_video_info(dev);
1135         if (!vid_info)
1136                 return -EFAULT;
1137
1138         f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1139         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
1140         f->fmt.pix.width        = vid_info->width;
1141         f->fmt.pix.height       = vid_info->height;
1142         f->fmt.pix.sizeimage    = dev->bulk_in_size;
1143         f->fmt.pix.colorspace   = 0;
1144         f->fmt.pix.bytesperline = 0;
1145         f->fmt.pix.field        = V4L2_FIELD_ANY;
1146
1147         kfree(vid_info);
1148         return 0;
1149 }
1150
1151 static int vidioc_encoder_cmd(struct file *filp, void *priv,
1152                                struct v4l2_encoder_cmd *a)
1153 {
1154         struct hdpvr_fh *fh = filp->private_data;
1155         struct hdpvr_device *dev = fh->dev;
1156         int res;
1157
1158         mutex_lock(&dev->io_mutex);
1159
1160         memset(&a->raw, 0, sizeof(a->raw));
1161         switch (a->cmd) {
1162         case V4L2_ENC_CMD_START:
1163                 a->flags = 0;
1164                 res = hdpvr_start_streaming(dev);
1165                 break;
1166         case V4L2_ENC_CMD_STOP:
1167                 res = hdpvr_stop_streaming(dev);
1168                 break;
1169         default:
1170                 v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
1171                          "Unsupported encoder cmd %d\n", a->cmd);
1172                 res = -EINVAL;
1173         }
1174         mutex_unlock(&dev->io_mutex);
1175         return res;
1176 }
1177
1178 static int vidioc_try_encoder_cmd(struct file *filp, void *priv,
1179                                         struct v4l2_encoder_cmd *a)
1180 {
1181         switch (a->cmd) {
1182         case V4L2_ENC_CMD_START:
1183         case V4L2_ENC_CMD_STOP:
1184                 return 0;
1185         default:
1186                 return -EINVAL;
1187         }
1188 }
1189
1190 static const struct v4l2_ioctl_ops hdpvr_ioctl_ops = {
1191         .vidioc_querycap        = vidioc_querycap,
1192         .vidioc_s_std           = vidioc_s_std,
1193         .vidioc_enum_input      = vidioc_enum_input,
1194         .vidioc_g_input         = vidioc_g_input,
1195         .vidioc_s_input         = vidioc_s_input,
1196         .vidioc_enumaudio       = vidioc_enumaudio,
1197         .vidioc_g_audio         = vidioc_g_audio,
1198         .vidioc_s_audio         = vidioc_s_audio,
1199         .vidioc_queryctrl       = vidioc_queryctrl,
1200         .vidioc_g_ctrl          = vidioc_g_ctrl,
1201         .vidioc_s_ctrl          = vidioc_s_ctrl,
1202         .vidioc_g_ext_ctrls     = vidioc_g_ext_ctrls,
1203         .vidioc_s_ext_ctrls     = vidioc_s_ext_ctrls,
1204         .vidioc_try_ext_ctrls   = vidioc_try_ext_ctrls,
1205         .vidioc_enum_fmt_vid_cap        = vidioc_enum_fmt_vid_cap,
1206         .vidioc_g_fmt_vid_cap           = vidioc_g_fmt_vid_cap,
1207         .vidioc_encoder_cmd     = vidioc_encoder_cmd,
1208         .vidioc_try_encoder_cmd = vidioc_try_encoder_cmd,
1209 };
1210
1211 static void hdpvr_device_release(struct video_device *vdev)
1212 {
1213         struct hdpvr_device *dev = video_get_drvdata(vdev);
1214
1215         hdpvr_delete(dev);
1216 }
1217
1218 static const struct video_device hdpvr_video_template = {
1219 /*      .type                   = VFL_TYPE_GRABBER, */
1220 /*      .type2                  = VID_TYPE_CAPTURE | VID_TYPE_MPEG_ENCODER, */
1221         .fops                   = &hdpvr_fops,
1222         .release                = hdpvr_device_release,
1223         .ioctl_ops              = &hdpvr_ioctl_ops,
1224         .tvnorms                =
1225                 V4L2_STD_NTSC  | V4L2_STD_SECAM | V4L2_STD_PAL_B |
1226                 V4L2_STD_PAL_G | V4L2_STD_PAL_H | V4L2_STD_PAL_I |
1227                 V4L2_STD_PAL_D | V4L2_STD_PAL_M | V4L2_STD_PAL_N |
1228                 V4L2_STD_PAL_60,
1229         .current_norm           = V4L2_STD_NTSC | V4L2_STD_PAL_M |
1230                 V4L2_STD_PAL_60,
1231 };
1232
1233 int hdpvr_register_videodev(struct hdpvr_device *dev, struct device *parent,
1234                             int devnum)
1235 {
1236         /* setup and register video device */
1237         dev->video_dev = video_device_alloc();
1238         if (!dev->video_dev) {
1239                 v4l2_err(&dev->v4l2_dev, "video_device_alloc() failed\n");
1240                 goto error;
1241         }
1242
1243         *(dev->video_dev) = hdpvr_video_template;
1244         strcpy(dev->video_dev->name, "Hauppauge HD PVR");
1245         dev->video_dev->parent = parent;
1246         video_set_drvdata(dev->video_dev, dev);
1247
1248         if (video_register_device(dev->video_dev, VFL_TYPE_GRABBER, devnum)) {
1249                 v4l2_err(&dev->v4l2_dev, "video_device registration failed\n");
1250                 goto error;
1251         }
1252
1253         return 0;
1254 error:
1255         return -ENOMEM;
1256 }