drivers/media/usb/stk1160/stk1160-v4l.c

   1 /*
   2  * STK1160 driver
   3  *
   4  * Copyright (C) 2012 Ezequiel Garcia
   5  * <elezegarcia--a.t--gmail.com>
   6  *
   7  * Based on Easycap driver by R.M. Thomas
   8  *      Copyright (C) 2010 R.M. Thomas
   9  *      <rmthomas--a.t--sciolus.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/usb.h>
  25 #include <linux/mm.h>
  26 #include <linux/slab.h>
  27
  28 #include <linux/videodev2.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-common.h>
  31 #include <media/v4l2-ioctl.h>
  32 #include <media/v4l2-fh.h>
  33 #include <media/v4l2-event.h>
  34 #include <media/videobuf2-vmalloc.h>
  35
  36 #include <media/saa7115.h>
  37
  38 #include "stk1160.h"
  39 #include "stk1160-reg.h"
  40
  41 static unsigned int vidioc_debug;
  42 module_param(vidioc_debug, int, 0644);
  43 MODULE_PARM_DESC(vidioc_debug, "enable debug messages [vidioc]");
  44
  45 static bool keep_buffers;
  46 module_param(keep_buffers, bool, 0644);
  47 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
  48
  49 /* supported video standards */
  50 static struct stk1160_fmt format[] = {
  51         {
  52                 .name     = "16 bpp YUY2, 4:2:2, packed",
  53                 .fourcc   = V4L2_PIX_FMT_UYVY,
  54                 .depth    = 16,
  55         }
  56 };
  57
  58 static void stk1160_set_std(struct stk1160 *dev)
  59 {
  60         int i;
  61
  62         static struct regval std525[] = {
  63
  64                 /* 720x480 */
  65
  66                 /* Frame start */
  67                 {STK116_CFSPO_STX_L, 0x0000},
  68                 {STK116_CFSPO_STX_H, 0x0000},
  69                 {STK116_CFSPO_STY_L, 0x0003},
  70                 {STK116_CFSPO_STY_H, 0x0000},
  71
  72                 /* Frame end */
  73                 {STK116_CFEPO_ENX_L, 0x05a0},
  74                 {STK116_CFEPO_ENX_H, 0x0005},
  75                 {STK116_CFEPO_ENY_L, 0x00f3},
  76                 {STK116_CFEPO_ENY_H, 0x0000},
  77
  78                 {0xffff, 0xffff}
  79         };
  80
  81         static struct regval std625[] = {
  82
  83                 /* 720x576 */
  84
  85                 /* TODO: Each line of frame has some junk at the end */
  86                 /* Frame start */
  87                 {STK116_CFSPO,   0x0000},
  88                 {STK116_CFSPO+1, 0x0000},
  89                 {STK116_CFSPO+2, 0x0001},
  90                 {STK116_CFSPO+3, 0x0000},
  91
  92                 /* Frame end */
  93                 {STK116_CFEPO,   0x05a0},
  94                 {STK116_CFEPO+1, 0x0005},
  95                 {STK116_CFEPO+2, 0x0121},
  96                 {STK116_CFEPO+3, 0x0001},
  97
  98                 {0xffff, 0xffff}
  99         };
 100
 101         if (dev->norm & V4L2_STD_525_60) {
 102                 stk1160_dbg("registers to NTSC like standard\n");
 103                 for (i = 0; std525[i].reg != 0xffff; i++)
 104                         stk1160_write_reg(dev, std525[i].reg, std525[i].val);
 105         } else {
 106                 stk1160_dbg("registers to PAL like standard\n");
 107                 for (i = 0; std625[i].reg != 0xffff; i++)
 108                         stk1160_write_reg(dev, std625[i].reg, std625[i].val);
 109         }
 110
 111 }
 112
 113 /*
 114  * Set a new alternate setting.
 115  * Returns true is dev->max_pkt_size has changed, false otherwise.
 116  */
 117 static bool stk1160_set_alternate(struct stk1160 *dev)
 118 {
 119         int i, prev_alt = dev->alt;
 120         unsigned int min_pkt_size;
 121         bool new_pkt_size;
 122
 123         /*
 124          * If we don't set right alternate,
 125          * then we will get a green screen with junk.
 126          */
 127         min_pkt_size = STK1160_MIN_PKT_SIZE;
 128
 129         for (i = 0; i < dev->num_alt; i++) {
 130                 /* stop when the selected alt setting offers enough bandwidth */
 131                 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
 132                         dev->alt = i;
 133                         break;
 134                 /*
 135                  * otherwise make sure that we end up with the maximum bandwidth
 136                  * because the min_pkt_size equation might be wrong...
 137                  */
 138                 } else if (dev->alt_max_pkt_size[i] >
 139                            dev->alt_max_pkt_size[dev->alt])
 140                         dev->alt = i;
 141         }
 142
 143         stk1160_info("setting alternate %d\n", dev->alt);
 144
 145         if (dev->alt != prev_alt) {
 146                 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
 147                                 min_pkt_size, dev->alt);
 148                 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
 149                                dev->alt, dev->alt_max_pkt_size[dev->alt]);
 150                 usb_set_interface(dev->udev, 0, dev->alt);
 151         }
 152
 153         new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
 154         dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
 155
 156         return new_pkt_size;
 157 }
 158
 159 static int stk1160_start_streaming(struct stk1160 *dev)
 160 {
 161         bool new_pkt_size;
 162         int rc = 0;
 163         int i;
 164
 165         /* Check device presence */
 166         if (!dev->udev)
 167                 return -ENODEV;
 168
 169         if (mutex_lock_interruptible(&dev->v4l_lock))
 170                 return -ERESTARTSYS;
 171         /*
 172          * For some reason it is mandatory to set alternate *first*
 173          * and only *then* initialize isoc urbs.
 174          * Someone please explain me why ;)
 175          */
 176         new_pkt_size = stk1160_set_alternate(dev);
 177
 178         /*
 179          * We (re)allocate isoc urbs if:
 180          * there is no allocated isoc urbs, OR
 181          * a new dev->max_pkt_size is detected
 182          */
 183         if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
 184                 rc = stk1160_alloc_isoc(dev);
 185                 if (rc < 0)
 186                         goto out_stop_hw;
 187         }
 188
 189         /* submit urbs and enables IRQ */
 190         for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
 191                 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
 192                 if (rc) {
 193                         stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
 194                         goto out_uninit;
 195                 }
 196         }
 197
 198         /* Start saa711x */
 199         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
 200
 201         /* Start stk1160 */
 202         stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
 203         stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
 204
 205         stk1160_dbg("streaming started\n");
 206
 207         mutex_unlock(&dev->v4l_lock);
 208
 209         return 0;
 210
 211 out_uninit:
 212         stk1160_uninit_isoc(dev);
 213 out_stop_hw:
 214         usb_set_interface(dev->udev, 0, 0);
 215         stk1160_clear_queue(dev);
 216
 217         mutex_unlock(&dev->v4l_lock);
 218
 219         return rc;
 220 }
 221
 222 /* Must be called with v4l_lock hold */
 223 static void stk1160_stop_hw(struct stk1160 *dev)
 224 {
 225         /* If the device is not physically present, there is nothing to do */
 226         if (!dev->udev)
 227                 return;
 228
 229         /* set alternate 0 */
 230         dev->alt = 0;
 231         stk1160_info("setting alternate %d\n", dev->alt);
 232         usb_set_interface(dev->udev, 0, 0);
 233
 234         /* Stop stk1160 */
 235         stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
 236         stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
 237
 238         /* Stop saa711x */
 239         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 240 }
 241
 242 static int stk1160_stop_streaming(struct stk1160 *dev)
 243 {
 244         if (mutex_lock_interruptible(&dev->v4l_lock))
 245                 return -ERESTARTSYS;
 246
 247         stk1160_cancel_isoc(dev);
 248
 249         /*
 250          * It is possible to keep buffers around using a module parameter.
 251          * This is intended to avoid memory fragmentation.
 252          */
 253         if (!keep_buffers)
 254                 stk1160_free_isoc(dev);
 255
 256         stk1160_stop_hw(dev);
 257
 258         stk1160_clear_queue(dev);
 259
 260         stk1160_dbg("streaming stopped\n");
 261
 262         mutex_unlock(&dev->v4l_lock);
 263
 264         return 0;
 265 }
 266
 267 static struct v4l2_file_operations stk1160_fops = {
 268         .owner = THIS_MODULE,
 269         .open = v4l2_fh_open,
 270         .release = vb2_fop_release,
 271         .read = vb2_fop_read,
 272         .poll = vb2_fop_poll,
 273         .mmap = vb2_fop_mmap,
 274         .unlocked_ioctl = video_ioctl2,
 275 };
 276
 277 /*
 278  * vidioc ioctls
 279  */
 280 static int vidioc_querycap(struct file *file,
 281                 void *priv, struct v4l2_capability *cap)
 282 {
 283         struct stk1160 *dev = video_drvdata(file);
 284
 285         strcpy(cap->driver, "stk1160");
 286         strcpy(cap->card, "stk1160");
 287         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 288         cap->device_caps =
 289                 V4L2_CAP_VIDEO_CAPTURE |
 290                 V4L2_CAP_STREAMING |
 291                 V4L2_CAP_READWRITE;
 292         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 293         return 0;
 294 }
 295
 296 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 297                 struct v4l2_fmtdesc *f)
 298 {
 299         if (f->index != 0)
 300                 return -EINVAL;
 301
 302         strlcpy(f->description, format[f->index].name, sizeof(f->description));
 303         f->pixelformat = format[f->index].fourcc;
 304         return 0;
 305 }
 306
 307 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 308                                         struct v4l2_format *f)
 309 {
 310         struct stk1160 *dev = video_drvdata(file);
 311
 312         f->fmt.pix.width = dev->width;
 313         f->fmt.pix.height = dev->height;
 314         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 315         f->fmt.pix.pixelformat = dev->fmt->fourcc;
 316         f->fmt.pix.bytesperline = dev->width * 2;
 317         f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
 318         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 319
 320         return 0;
 321 }
 322
 323 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 324                         struct v4l2_format *f)
 325 {
 326         struct stk1160 *dev = video_drvdata(file);
 327
 328         /*
 329          * User can't choose size at his own will,
 330          * so we just return him the current size chosen
 331          * at standard selection.
 332          * TODO: Implement frame scaling?
 333          */
 334
 335         f->fmt.pix.pixelformat = dev->fmt->fourcc;
 336         f->fmt.pix.width = dev->width;
 337         f->fmt.pix.height = dev->height;
 338         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 339         f->fmt.pix.bytesperline = dev->width * 2;
 340         f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
 341         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 342
 343         return 0;
 344 }
 345
 346 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 347                                         struct v4l2_format *f)
 348 {
 349         struct stk1160 *dev = video_drvdata(file);
 350         struct vb2_queue *q = &dev->vb_vidq;
 351
 352         if (vb2_is_busy(q))
 353                 return -EBUSY;
 354
 355         vidioc_try_fmt_vid_cap(file, priv, f);
 356
 357         /* We don't support any format changes */
 358
 359         return 0;
 360 }
 361
 362 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
 363 {
 364         struct stk1160 *dev = video_drvdata(file);
 365         v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
 366         return 0;
 367 }
 368
 369 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 370 {
 371         struct stk1160 *dev = video_drvdata(file);
 372
 373         *norm = dev->norm;
 374         return 0;
 375 }
 376
 377 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
 378 {
 379         struct stk1160 *dev = video_drvdata(file);
 380         struct vb2_queue *q = &dev->vb_vidq;
 381
 382         if (dev->norm == norm)
 383                 return 0;
 384
 385         if (vb2_is_busy(q))
 386                 return -EBUSY;
 387
 388         /* Check device presence */
 389         if (!dev->udev)
 390                 return -ENODEV;
 391
 392         /* We need to set this now, before we call stk1160_set_std */
 393         dev->norm = norm;
 394
 395         /* This is taken from saa7115 video decoder */
 396         if (dev->norm & V4L2_STD_525_60) {
 397                 dev->width = 720;
 398                 dev->height = 480;
 399         } else if (dev->norm & V4L2_STD_625_50) {
 400                 dev->width = 720;
 401                 dev->height = 576;
 402         } else {
 403                 stk1160_err("invalid standard\n");
 404                 return -EINVAL;
 405         }
 406
 407         stk1160_set_std(dev);
 408
 409         v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std,
 410                         dev->norm);
 411
 412         return 0;
 413 }
 414
 415
 416 static int vidioc_enum_input(struct file *file, void *priv,
 417                                 struct v4l2_input *i)
 418 {
 419         struct stk1160 *dev = video_drvdata(file);
 420
 421         if (i->index > STK1160_MAX_INPUT)
 422                 return -EINVAL;
 423
 424         /* S-Video special handling */
 425         if (i->index == STK1160_SVIDEO_INPUT)
 426                 sprintf(i->name, "S-Video");
 427         else
 428                 sprintf(i->name, "Composite%d", i->index);
 429
 430         i->type = V4L2_INPUT_TYPE_CAMERA;
 431         i->std = dev->vdev.tvnorms;
 432         return 0;
 433 }
 434
 435 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 436 {
 437         struct stk1160 *dev = video_drvdata(file);
 438         *i = dev->ctl_input;
 439         return 0;
 440 }
 441
 442 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 443 {
 444         struct stk1160 *dev = video_drvdata(file);
 445
 446         if (i > STK1160_MAX_INPUT)
 447                 return -EINVAL;
 448
 449         dev->ctl_input = i;
 450
 451         stk1160_select_input(dev);
 452
 453         return 0;
 454 }
 455
 456 #ifdef CONFIG_VIDEO_ADV_DEBUG
 457 static int vidioc_g_register(struct file *file, void *priv,
 458                              struct v4l2_dbg_register *reg)
 459 {
 460         struct stk1160 *dev = video_drvdata(file);
 461         int rc;
 462         u8 val;
 463
 464         /* Match host */
 465         rc = stk1160_read_reg(dev, reg->reg, &val);
 466         reg->val = val;
 467         reg->size = 1;
 468
 469         return rc;
 470 }
 471
 472 static int vidioc_s_register(struct file *file, void *priv,
 473                              const struct v4l2_dbg_register *reg)
 474 {
 475         struct stk1160 *dev = video_drvdata(file);
 476
 477         /* Match host */
 478         return stk1160_write_reg(dev, reg->reg, cpu_to_le16(reg->val));
 479 }
 480 #endif
 481
 482 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
 483         .vidioc_querycap      = vidioc_querycap,
 484         .vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
 485         .vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
 486         .vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
 487         .vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
 488         .vidioc_querystd      = vidioc_querystd,
 489         .vidioc_g_std         = vidioc_g_std,
 490         .vidioc_s_std         = vidioc_s_std,
 491         .vidioc_enum_input    = vidioc_enum_input,
 492         .vidioc_g_input       = vidioc_g_input,
 493         .vidioc_s_input       = vidioc_s_input,
 494
 495         /* vb2 takes care of these */
 496         .vidioc_reqbufs       = vb2_ioctl_reqbufs,
 497         .vidioc_querybuf      = vb2_ioctl_querybuf,
 498         .vidioc_qbuf          = vb2_ioctl_qbuf,
 499         .vidioc_dqbuf         = vb2_ioctl_dqbuf,
 500         .vidioc_streamon      = vb2_ioctl_streamon,
 501         .vidioc_streamoff     = vb2_ioctl_streamoff,
 502
 503         .vidioc_log_status  = v4l2_ctrl_log_status,
 504         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 505         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 506
 507 #ifdef CONFIG_VIDEO_ADV_DEBUG
 508         .vidioc_g_register = vidioc_g_register,
 509         .vidioc_s_register = vidioc_s_register,
 510 #endif
 511 };
 512
 513 /********************************************************************/
 514
 515 /*
 516  * Videobuf2 operations
 517  */
 518 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *v4l_fmt,
 519                                 unsigned int *nbuffers, unsigned int *nplanes,
 520                                 unsigned int sizes[], void *alloc_ctxs[])
 521 {
 522         struct stk1160 *dev = vb2_get_drv_priv(vq);
 523         unsigned long size;
 524
 525         size = dev->width * dev->height * 2;
 526
 527         /*
 528          * Here we can change the number of buffers being requested.
 529          * So, we set a minimum and a maximum like this:
 530          */
 531         *nbuffers = clamp_t(unsigned int, *nbuffers,
 532                         STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
 533
 534         /* This means a packed colorformat */
 535         *nplanes = 1;
 536
 537         sizes[0] = size;
 538
 539         stk1160_info("%s: buffer count %d, each %ld bytes\n",
 540                         __func__, *nbuffers, size);
 541
 542         return 0;
 543 }
 544
 545 static void buffer_queue(struct vb2_buffer *vb)
 546 {
 547         unsigned long flags;
 548         struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
 549         struct stk1160_buffer *buf =
 550                 container_of(vb, struct stk1160_buffer, vb);
 551
 552         spin_lock_irqsave(&dev->buf_lock, flags);
 553         if (!dev->udev) {
 554                 /*
 555                  * If the device is disconnected return the buffer to userspace
 556                  * directly. The next QBUF call will fail with -ENODEV.
 557                  */
 558                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
 559         } else {
 560
 561                 buf->mem = vb2_plane_vaddr(vb, 0);
 562                 buf->length = vb2_plane_size(vb, 0);
 563                 buf->bytesused = 0;
 564                 buf->pos = 0;
 565
 566                 /*
 567                  * If buffer length is less from expected then we return
 568                  * the buffer to userspace directly.
 569                  */
 570                 if (buf->length < dev->width * dev->height * 2)
 571                         vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
 572                 else
 573                         list_add_tail(&buf->list, &dev->avail_bufs);
 574
 575         }
 576         spin_unlock_irqrestore(&dev->buf_lock, flags);
 577 }
 578
 579 static int start_streaming(struct vb2_queue *vq, unsigned int count)
 580 {
 581         struct stk1160 *dev = vb2_get_drv_priv(vq);
 582         return stk1160_start_streaming(dev);
 583 }
 584
 585 /* abort streaming and wait for last buffer */
 586 static int stop_streaming(struct vb2_queue *vq)
 587 {
 588         struct stk1160 *dev = vb2_get_drv_priv(vq);
 589         return stk1160_stop_streaming(dev);
 590 }
 591
 592 static struct vb2_ops stk1160_video_qops = {
 593         .queue_setup            = queue_setup,
 594         .buf_queue              = buffer_queue,
 595         .start_streaming        = start_streaming,
 596         .stop_streaming         = stop_streaming,
 597         .wait_prepare           = vb2_ops_wait_prepare,
 598         .wait_finish            = vb2_ops_wait_finish,
 599 };
 600
 601 static struct video_device v4l_template = {
 602         .name = "stk1160",
 603         .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
 604         .fops = &stk1160_fops,
 605         .ioctl_ops = &stk1160_ioctl_ops,
 606         .release = video_device_release_empty,
 607 };
 608
 609 /********************************************************************/
 610
 611 /* Must be called with both v4l_lock and vb_queue_lock hold */
 612 void stk1160_clear_queue(struct stk1160 *dev)
 613 {
 614         struct stk1160_buffer *buf;
 615         unsigned long flags;
 616
 617         /* Release all active buffers */
 618         spin_lock_irqsave(&dev->buf_lock, flags);
 619         while (!list_empty(&dev->avail_bufs)) {
 620                 buf = list_first_entry(&dev->avail_bufs,
 621                         struct stk1160_buffer, list);
 622                 list_del(&buf->list);
 623                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
 624                 stk1160_info("buffer [%p/%d] aborted\n",
 625                                 buf, buf->vb.v4l2_buf.index);
 626         }
 627         /* It's important to clear current buffer */
 628         dev->isoc_ctl.buf = NULL;
 629         spin_unlock_irqrestore(&dev->buf_lock, flags);
 630 }
 631
 632 int stk1160_vb2_setup(struct stk1160 *dev)
 633 {
 634         int rc;
 635         struct vb2_queue *q;
 636
 637         q = &dev->vb_vidq;
 638         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 639         q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
 640         q->drv_priv = dev;
 641         q->buf_struct_size = sizeof(struct stk1160_buffer);
 642         q->ops = &stk1160_video_qops;
 643         q->mem_ops = &vb2_vmalloc_memops;
 644         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 645
 646         rc = vb2_queue_init(q);
 647         if (rc < 0)
 648                 return rc;
 649
 650         /* initialize video dma queue */
 651         INIT_LIST_HEAD(&dev->avail_bufs);
 652
 653         return 0;
 654 }
 655
 656 int stk1160_video_register(struct stk1160 *dev)
 657 {
 658         int rc;
 659
 660         /* Initialize video_device with a template structure */
 661         dev->vdev = v4l_template;
 662         dev->vdev.debug = vidioc_debug;
 663         dev->vdev.queue = &dev->vb_vidq;
 664
 665         /*
 666          * Provide mutexes for v4l2 core and for videobuf2 queue.
 667          * It will be used to protect *only* v4l2 ioctls.
 668          */
 669         dev->vdev.lock = &dev->v4l_lock;
 670         dev->vdev.queue->lock = &dev->vb_queue_lock;
 671
 672         /* This will be used to set video_device parent */
 673         dev->vdev.v4l2_dev = &dev->v4l2_dev;
 674         set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
 675
 676         /* NTSC is default */
 677         dev->norm = V4L2_STD_NTSC_M;
 678         dev->width = 720;
 679         dev->height = 480;
 680
 681         /* set default format */
 682         dev->fmt = &format[0];
 683         stk1160_set_std(dev);
 684
 685         v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std,
 686                         dev->norm);
 687
 688         video_set_drvdata(&dev->vdev, dev);
 689         rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
 690         if (rc < 0) {
 691                 stk1160_err("video_register_device failed (%d)\n", rc);
 692                 return rc;
 693         }
 694
 695         v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
 696                   video_device_node_name(&dev->vdev));
 697
 698         return 0;
 699 }