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

DEFINITIONS

1. div_round_integer
2. stk1160_set_std
3. stk1160_set_fmt
4. stk1160_set_alternate
5. stk1160_start_streaming
6. stk1160_stop_hw
7. stk1160_stop_streaming
8. vidioc_querycap
9. vidioc_enum_fmt_vid_cap
10. vidioc_g_fmt_vid_cap
11. stk1160_try_fmt
12. vidioc_try_fmt_vid_cap
13. vidioc_s_fmt_vid_cap
14. vidioc_querystd
15. vidioc_g_std
16. vidioc_s_std
17. vidioc_enum_input
18. vidioc_g_input
19. vidioc_s_input
20. vidioc_g_register
21. vidioc_s_register
22. queue_setup
23. buffer_queue
24. start_streaming
25. stop_streaming
26. stk1160_clear_queue
27. stk1160_vb2_setup
28. stk1160_video_register

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * STK1160 driver
   4  *
   5  * Copyright (C) 2012 Ezequiel Garcia
   6  * <elezegarcia--a.t--gmail.com>
   7  *
   8  * Based on Easycap driver by R.M. Thomas
   9  *      Copyright (C) 2010 R.M. Thomas
  10  *      <rmthomas--a.t--sciolus.org>
  11  */
  12 
  13 #include <linux/module.h>
  14 #include <linux/usb.h>
  15 #include <linux/mm.h>
  16 #include <linux/slab.h>
  17 
  18 #include <linux/videodev2.h>
  19 #include <media/v4l2-device.h>
  20 #include <media/v4l2-common.h>
  21 #include <media/v4l2-ioctl.h>
  22 #include <media/v4l2-fh.h>
  23 #include <media/v4l2-event.h>
  24 #include <media/videobuf2-vmalloc.h>
  25 
  26 #include <media/i2c/saa7115.h>
  27 
  28 #include "stk1160.h"
  29 #include "stk1160-reg.h"
  30 
  31 static bool keep_buffers;
  32 module_param(keep_buffers, bool, 0644);
  33 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
  34 
  35 enum stk1160_decimate_mode {
  36         STK1160_DECIMATE_MORE_THAN_HALF,
  37         STK1160_DECIMATE_LESS_THAN_HALF,
  38 };
  39 
  40 struct stk1160_decimate_ctrl {
  41         bool col_en, row_en;
  42         enum stk1160_decimate_mode col_mode, row_mode;
  43         unsigned int col_n, row_n;
  44 };
  45 
  46 /* supported video standards */
  47 static struct stk1160_fmt format[] = {
  48         {
  49                 .fourcc   = V4L2_PIX_FMT_UYVY,
  50                 .depth    = 16,
  51         }
  52 };
  53 
  54 /*
  55  * Helper to find the next divisor that results in modulo being zero.
  56  * This is required to guarantee valid decimation unit counts.
  57  */
  58 static unsigned int
  59 div_round_integer(unsigned int x, unsigned int y)
  60 {
  61         for (;; y++) {
  62                 if (x % y == 0)
  63                         return x / y;
  64         }
  65 }
  66 
  67 static void stk1160_set_std(struct stk1160 *dev)
  68 {
  69         int i;
  70 
  71         static struct regval std525[] = {
  72 
  73                 /* 720x480 */
  74 
  75                 /* Frame start */
  76                 {STK116_CFSPO_STX_L, 0x0000},
  77                 {STK116_CFSPO_STX_H, 0x0000},
  78                 {STK116_CFSPO_STY_L, 0x0003},
  79                 {STK116_CFSPO_STY_H, 0x0000},
  80 
  81                 /* Frame end */
  82                 {STK116_CFEPO_ENX_L, 0x05a0},
  83                 {STK116_CFEPO_ENX_H, 0x0005},
  84                 {STK116_CFEPO_ENY_L, 0x00f3},
  85                 {STK116_CFEPO_ENY_H, 0x0000},
  86 
  87                 {0xffff, 0xffff}
  88         };
  89 
  90         static struct regval std625[] = {
  91 
  92                 /* 720x576 */
  93 
  94                 /* TODO: Each line of frame has some junk at the end */
  95                 /* Frame start */
  96                 {STK116_CFSPO,   0x0000},
  97                 {STK116_CFSPO+1, 0x0000},
  98                 {STK116_CFSPO+2, 0x0001},
  99                 {STK116_CFSPO+3, 0x0000},
 100 
 101                 /* Frame end */
 102                 {STK116_CFEPO,   0x05a0},
 103                 {STK116_CFEPO+1, 0x0005},
 104                 {STK116_CFEPO+2, 0x0121},
 105                 {STK116_CFEPO+3, 0x0001},
 106 
 107                 {0xffff, 0xffff}
 108         };
 109 
 110         if (dev->norm & V4L2_STD_525_60) {
 111                 stk1160_dbg("registers to NTSC like standard\n");
 112                 for (i = 0; std525[i].reg != 0xffff; i++)
 113                         stk1160_write_reg(dev, std525[i].reg, std525[i].val);
 114         } else {
 115                 stk1160_dbg("registers to PAL like standard\n");
 116                 for (i = 0; std625[i].reg != 0xffff; i++)
 117                         stk1160_write_reg(dev, std625[i].reg, std625[i].val);
 118         }
 119 
 120 }
 121 
 122 static void stk1160_set_fmt(struct stk1160 *dev,
 123                             struct stk1160_decimate_ctrl *ctrl)
 124 {
 125         u32 val = 0;
 126 
 127         if (ctrl) {
 128                 /*
 129                  * Since the format is UYVY, the device must skip or send
 130                  * a number of rows/columns multiple of four. This way, the
 131                  * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
 132                  * does exactly this.
 133                  */
 134                 val |= STK1160_DEC_UNIT_SIZE;
 135                 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
 136                 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
 137                 val |= ctrl->col_mode ==
 138                         STK1160_DECIMATE_MORE_THAN_HALF ?
 139                         STK1160_H_DEC_MODE : 0;
 140                 val |= ctrl->row_mode ==
 141                         STK1160_DECIMATE_MORE_THAN_HALF ?
 142                         STK1160_V_DEC_MODE : 0;
 143 
 144                 /* Horizontal count units */
 145                 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
 146                 /* Vertical count units */
 147                 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
 148 
 149                 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
 150                             val, ctrl->col_n, ctrl->row_n);
 151         }
 152 
 153         /* Decimation control */
 154         stk1160_write_reg(dev, STK1160_DMCTRL, val);
 155 }
 156 
 157 /*
 158  * Set a new alternate setting.
 159  * Returns true is dev->max_pkt_size has changed, false otherwise.
 160  */
 161 static bool stk1160_set_alternate(struct stk1160 *dev)
 162 {
 163         int i, prev_alt = dev->alt;
 164         unsigned int min_pkt_size;
 165         bool new_pkt_size;
 166 
 167         /*
 168          * If we don't set right alternate,
 169          * then we will get a green screen with junk.
 170          */
 171         min_pkt_size = STK1160_MIN_PKT_SIZE;
 172 
 173         for (i = 0; i < dev->num_alt; i++) {
 174                 /* stop when the selected alt setting offers enough bandwidth */
 175                 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
 176                         dev->alt = i;
 177                         break;
 178                 /*
 179                  * otherwise make sure that we end up with the maximum bandwidth
 180                  * because the min_pkt_size equation might be wrong...
 181                  */
 182                 } else if (dev->alt_max_pkt_size[i] >
 183                            dev->alt_max_pkt_size[dev->alt])
 184                         dev->alt = i;
 185         }
 186 
 187         stk1160_dbg("setting alternate %d\n", dev->alt);
 188 
 189         if (dev->alt != prev_alt) {
 190                 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
 191                                 min_pkt_size, dev->alt);
 192                 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
 193                                dev->alt, dev->alt_max_pkt_size[dev->alt]);
 194                 usb_set_interface(dev->udev, 0, dev->alt);
 195         }
 196 
 197         new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
 198         dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
 199 
 200         return new_pkt_size;
 201 }
 202 
 203 static int stk1160_start_streaming(struct stk1160 *dev)
 204 {
 205         bool new_pkt_size;
 206         int rc = 0;
 207         int i;
 208 
 209         /* Check device presence */
 210         if (!dev->udev)
 211                 return -ENODEV;
 212 
 213         if (mutex_lock_interruptible(&dev->v4l_lock))
 214                 return -ERESTARTSYS;
 215         /*
 216          * For some reason it is mandatory to set alternate *first*
 217          * and only *then* initialize isoc urbs.
 218          * Someone please explain me why ;)
 219          */
 220         new_pkt_size = stk1160_set_alternate(dev);
 221 
 222         /*
 223          * We (re)allocate isoc urbs if:
 224          * there is no allocated isoc urbs, OR
 225          * a new dev->max_pkt_size is detected
 226          */
 227         if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
 228                 rc = stk1160_alloc_isoc(dev);
 229                 if (rc < 0)
 230                         goto out_stop_hw;
 231         }
 232 
 233         /* submit urbs and enables IRQ */
 234         for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
 235                 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
 236                 if (rc) {
 237                         stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
 238                         goto out_uninit;
 239                 }
 240         }
 241 
 242         /* Start saa711x */
 243         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
 244 
 245         dev->sequence = 0;
 246 
 247         /* Start stk1160 */
 248         stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
 249         stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
 250 
 251         stk1160_dbg("streaming started\n");
 252 
 253         mutex_unlock(&dev->v4l_lock);
 254 
 255         return 0;
 256 
 257 out_uninit:
 258         stk1160_uninit_isoc(dev);
 259 out_stop_hw:
 260         usb_set_interface(dev->udev, 0, 0);
 261         stk1160_clear_queue(dev);
 262 
 263         mutex_unlock(&dev->v4l_lock);
 264 
 265         return rc;
 266 }
 267 
 268 /* Must be called with v4l_lock hold */
 269 static void stk1160_stop_hw(struct stk1160 *dev)
 270 {
 271         /* If the device is not physically present, there is nothing to do */
 272         if (!dev->udev)
 273                 return;
 274 
 275         /* set alternate 0 */
 276         dev->alt = 0;
 277         stk1160_dbg("setting alternate %d\n", dev->alt);
 278         usb_set_interface(dev->udev, 0, 0);
 279 
 280         /* Stop stk1160 */
 281         stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
 282         stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
 283 
 284         /* Stop saa711x */
 285         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 286 }
 287 
 288 static int stk1160_stop_streaming(struct stk1160 *dev)
 289 {
 290         if (mutex_lock_interruptible(&dev->v4l_lock))
 291                 return -ERESTARTSYS;
 292 
 293         /*
 294          * Once URBs are cancelled, the URB complete handler
 295          * won't be running. This is required to safely release the
 296          * current buffer (dev->isoc_ctl.buf).
 297          */
 298         stk1160_cancel_isoc(dev);
 299 
 300         /*
 301          * It is possible to keep buffers around using a module parameter.
 302          * This is intended to avoid memory fragmentation.
 303          */
 304         if (!keep_buffers)
 305                 stk1160_free_isoc(dev);
 306 
 307         stk1160_stop_hw(dev);
 308 
 309         stk1160_clear_queue(dev);
 310 
 311         stk1160_dbg("streaming stopped\n");
 312 
 313         mutex_unlock(&dev->v4l_lock);
 314 
 315         return 0;
 316 }
 317 
 318 static const struct v4l2_file_operations stk1160_fops = {
 319         .owner = THIS_MODULE,
 320         .open = v4l2_fh_open,
 321         .release = vb2_fop_release,
 322         .read = vb2_fop_read,
 323         .poll = vb2_fop_poll,
 324         .mmap = vb2_fop_mmap,
 325         .unlocked_ioctl = video_ioctl2,
 326 };
 327 
 328 /*
 329  * vidioc ioctls
 330  */
 331 static int vidioc_querycap(struct file *file,
 332                 void *priv, struct v4l2_capability *cap)
 333 {
 334         struct stk1160 *dev = video_drvdata(file);
 335 
 336         strscpy(cap->driver, "stk1160", sizeof(cap->driver));
 337         strscpy(cap->card, "stk1160", sizeof(cap->card));
 338         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 339         return 0;
 340 }
 341 
 342 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 343                 struct v4l2_fmtdesc *f)
 344 {
 345         if (f->index != 0)
 346                 return -EINVAL;
 347 
 348         f->pixelformat = format[f->index].fourcc;
 349         return 0;
 350 }
 351 
 352 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 353                                         struct v4l2_format *f)
 354 {
 355         struct stk1160 *dev = video_drvdata(file);
 356 
 357         f->fmt.pix.width = dev->width;
 358         f->fmt.pix.height = dev->height;
 359         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 360         f->fmt.pix.pixelformat = dev->fmt->fourcc;
 361         f->fmt.pix.bytesperline = dev->width * 2;
 362         f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
 363         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 364 
 365         return 0;
 366 }
 367 
 368 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
 369                             struct stk1160_decimate_ctrl *ctrl)
 370 {
 371         unsigned int width, height;
 372         unsigned int base_width, base_height;
 373         unsigned int col_n, row_n;
 374         enum stk1160_decimate_mode col_mode, row_mode;
 375         bool col_en, row_en;
 376 
 377         base_width = 720;
 378         base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
 379 
 380         /* Minimum width and height is 5% the frame size */
 381         width = clamp_t(unsigned int, f->fmt.pix.width,
 382                         base_width / 20, base_width);
 383         height = clamp_t(unsigned int, f->fmt.pix.height,
 384                         base_height / 20, base_height);
 385 
 386         /* Let's set default no decimation values */
 387         col_n = 0;
 388         row_n = 0;
 389         col_en = false;
 390         row_en = false;
 391         f->fmt.pix.width = base_width;
 392         f->fmt.pix.height = base_height;
 393         row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
 394         col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
 395 
 396         if (width < base_width && width > base_width / 2) {
 397                 /*
 398                  * The device will send count units for each
 399                  * unit skipped. This means count unit is:
 400                  *
 401                  * n = width / (frame width - width)
 402                  *
 403                  * And the width is:
 404                  *
 405                  * width = (n / n + 1) * frame width
 406                  */
 407                 col_n = div_round_integer(width, base_width - width);
 408                 if (col_n > 0 && col_n <= 255) {
 409                         col_en = true;
 410                         col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
 411                         f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
 412                 }
 413 
 414         } else if (width <= base_width / 2) {
 415 
 416                 /*
 417                  * The device will skip count units for each
 418                  * unit sent. This means count is:
 419                  *
 420                  * n = (frame width / width) - 1
 421                  *
 422                  * And the width is:
 423                  *
 424                  * width = frame width / (n + 1)
 425                  */
 426                 col_n = div_round_integer(base_width, width) - 1;
 427                 if (col_n > 0 && col_n <= 255) {
 428                         col_en = true;
 429                         col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
 430                         f->fmt.pix.width = base_width / (col_n + 1);
 431                 }
 432         }
 433 
 434         if (height < base_height && height > base_height / 2) {
 435                 row_n = div_round_integer(height, base_height - height);
 436                 if (row_n > 0 && row_n <= 255) {
 437                         row_en = true;
 438                         row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
 439                         f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
 440                 }
 441 
 442         } else if (height <= base_height / 2) {
 443                 row_n = div_round_integer(base_height, height) - 1;
 444                 if (row_n > 0 && row_n <= 255) {
 445                         row_en = true;
 446                         row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
 447                         f->fmt.pix.height = base_height / (row_n + 1);
 448                 }
 449         }
 450 
 451         f->fmt.pix.pixelformat = dev->fmt->fourcc;
 452         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 453         f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
 454         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
 455         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 456 
 457         if (ctrl) {
 458                 ctrl->col_en = col_en;
 459                 ctrl->col_n = col_n;
 460                 ctrl->col_mode = col_mode;
 461                 ctrl->row_en = row_en;
 462                 ctrl->row_n = row_n;
 463                 ctrl->row_mode = row_mode;
 464         }
 465 
 466         stk1160_dbg("width %d, height %d\n",
 467                     f->fmt.pix.width, f->fmt.pix.height);
 468         return 0;
 469 }
 470 
 471 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 472                                   struct v4l2_format *f)
 473 {
 474         struct stk1160 *dev = video_drvdata(file);
 475 
 476         return stk1160_try_fmt(dev, f, NULL);
 477 }
 478 
 479 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 480                                         struct v4l2_format *f)
 481 {
 482         struct stk1160 *dev = video_drvdata(file);
 483         struct vb2_queue *q = &dev->vb_vidq;
 484         struct stk1160_decimate_ctrl ctrl;
 485         int rc;
 486 
 487         if (vb2_is_busy(q))
 488                 return -EBUSY;
 489 
 490         rc = stk1160_try_fmt(dev, f, &ctrl);
 491         if (rc < 0)
 492                 return rc;
 493         dev->width = f->fmt.pix.width;
 494         dev->height = f->fmt.pix.height;
 495         stk1160_set_fmt(dev, &ctrl);
 496 
 497         return 0;
 498 }
 499 
 500 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
 501 {
 502         struct stk1160 *dev = video_drvdata(file);
 503         v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
 504         return 0;
 505 }
 506 
 507 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 508 {
 509         struct stk1160 *dev = video_drvdata(file);
 510 
 511         *norm = dev->norm;
 512         return 0;
 513 }
 514 
 515 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
 516 {
 517         struct stk1160 *dev = video_drvdata(file);
 518         struct vb2_queue *q = &dev->vb_vidq;
 519 
 520         if (dev->norm == norm)
 521                 return 0;
 522 
 523         if (vb2_is_busy(q))
 524                 return -EBUSY;
 525 
 526         /* Check device presence */
 527         if (!dev->udev)
 528                 return -ENODEV;
 529 
 530         /* We need to set this now, before we call stk1160_set_std */
 531         dev->width = 720;
 532         dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
 533         dev->norm = norm;
 534 
 535         stk1160_set_std(dev);
 536 
 537         /* Calling with NULL disables frame decimation */
 538         stk1160_set_fmt(dev, NULL);
 539 
 540         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
 541                         dev->norm);
 542 
 543         return 0;
 544 }
 545 
 546 
 547 static int vidioc_enum_input(struct file *file, void *priv,
 548                                 struct v4l2_input *i)
 549 {
 550         struct stk1160 *dev = video_drvdata(file);
 551 
 552         if (i->index > STK1160_MAX_INPUT)
 553                 return -EINVAL;
 554 
 555         /* S-Video special handling */
 556         if (i->index == STK1160_SVIDEO_INPUT)
 557                 sprintf(i->name, "S-Video");
 558         else
 559                 sprintf(i->name, "Composite%d", i->index);
 560 
 561         i->type = V4L2_INPUT_TYPE_CAMERA;
 562         i->std = dev->vdev.tvnorms;
 563         return 0;
 564 }
 565 
 566 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 567 {
 568         struct stk1160 *dev = video_drvdata(file);
 569         *i = dev->ctl_input;
 570         return 0;
 571 }
 572 
 573 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 574 {
 575         struct stk1160 *dev = video_drvdata(file);
 576 
 577         if (i > STK1160_MAX_INPUT)
 578                 return -EINVAL;
 579 
 580         dev->ctl_input = i;
 581 
 582         stk1160_select_input(dev);
 583 
 584         return 0;
 585 }
 586 
 587 #ifdef CONFIG_VIDEO_ADV_DEBUG
 588 static int vidioc_g_register(struct file *file, void *priv,
 589                              struct v4l2_dbg_register *reg)
 590 {
 591         struct stk1160 *dev = video_drvdata(file);
 592         int rc;
 593         u8 val;
 594 
 595         /* Match host */
 596         rc = stk1160_read_reg(dev, reg->reg, &val);
 597         reg->val = val;
 598         reg->size = 1;
 599 
 600         return rc;
 601 }
 602 
 603 static int vidioc_s_register(struct file *file, void *priv,
 604                              const struct v4l2_dbg_register *reg)
 605 {
 606         struct stk1160 *dev = video_drvdata(file);
 607 
 608         /* Match host */
 609         return stk1160_write_reg(dev, reg->reg, reg->val);
 610 }
 611 #endif
 612 
 613 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
 614         .vidioc_querycap      = vidioc_querycap,
 615         .vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
 616         .vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
 617         .vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
 618         .vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
 619         .vidioc_querystd      = vidioc_querystd,
 620         .vidioc_g_std         = vidioc_g_std,
 621         .vidioc_s_std         = vidioc_s_std,
 622         .vidioc_enum_input    = vidioc_enum_input,
 623         .vidioc_g_input       = vidioc_g_input,
 624         .vidioc_s_input       = vidioc_s_input,
 625 
 626         /* vb2 takes care of these */
 627         .vidioc_reqbufs       = vb2_ioctl_reqbufs,
 628         .vidioc_querybuf      = vb2_ioctl_querybuf,
 629         .vidioc_qbuf          = vb2_ioctl_qbuf,
 630         .vidioc_dqbuf         = vb2_ioctl_dqbuf,
 631         .vidioc_streamon      = vb2_ioctl_streamon,
 632         .vidioc_streamoff     = vb2_ioctl_streamoff,
 633         .vidioc_expbuf        = vb2_ioctl_expbuf,
 634 
 635         .vidioc_log_status  = v4l2_ctrl_log_status,
 636         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 637         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 638 
 639 #ifdef CONFIG_VIDEO_ADV_DEBUG
 640         .vidioc_g_register = vidioc_g_register,
 641         .vidioc_s_register = vidioc_s_register,
 642 #endif
 643 };
 644 
 645 /********************************************************************/
 646 
 647 /*
 648  * Videobuf2 operations
 649  */
 650 static int queue_setup(struct vb2_queue *vq,
 651                                 unsigned int *nbuffers, unsigned int *nplanes,
 652                                 unsigned int sizes[], struct device *alloc_devs[])
 653 {
 654         struct stk1160 *dev = vb2_get_drv_priv(vq);
 655         unsigned long size;
 656 
 657         size = dev->width * dev->height * 2;
 658 
 659         /*
 660          * Here we can change the number of buffers being requested.
 661          * So, we set a minimum and a maximum like this:
 662          */
 663         *nbuffers = clamp_t(unsigned int, *nbuffers,
 664                         STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
 665 
 666         if (*nplanes)
 667                 return sizes[0] < size ? -EINVAL : 0;
 668 
 669         /* This means a packed colorformat */
 670         *nplanes = 1;
 671 
 672         sizes[0] = size;
 673 
 674         stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
 675                     __func__, *nbuffers, size);
 676 
 677         return 0;
 678 }
 679 
 680 static void buffer_queue(struct vb2_buffer *vb)
 681 {
 682         unsigned long flags;
 683         struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
 684         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 685         struct stk1160_buffer *buf =
 686                 container_of(vbuf, struct stk1160_buffer, vb);
 687 
 688         spin_lock_irqsave(&dev->buf_lock, flags);
 689         if (!dev->udev) {
 690                 /*
 691                  * If the device is disconnected return the buffer to userspace
 692                  * directly. The next QBUF call will fail with -ENODEV.
 693                  */
 694                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 695         } else {
 696 
 697                 buf->mem = vb2_plane_vaddr(vb, 0);
 698                 buf->length = vb2_plane_size(vb, 0);
 699                 buf->bytesused = 0;
 700                 buf->pos = 0;
 701 
 702                 /*
 703                  * If buffer length is less from expected then we return
 704                  * the buffer to userspace directly.
 705                  */
 706                 if (buf->length < dev->width * dev->height * 2)
 707                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 708                 else
 709                         list_add_tail(&buf->list, &dev->avail_bufs);
 710 
 711         }
 712         spin_unlock_irqrestore(&dev->buf_lock, flags);
 713 }
 714 
 715 static int start_streaming(struct vb2_queue *vq, unsigned int count)
 716 {
 717         struct stk1160 *dev = vb2_get_drv_priv(vq);
 718         return stk1160_start_streaming(dev);
 719 }
 720 
 721 /* abort streaming and wait for last buffer */
 722 static void stop_streaming(struct vb2_queue *vq)
 723 {
 724         struct stk1160 *dev = vb2_get_drv_priv(vq);
 725         stk1160_stop_streaming(dev);
 726 }
 727 
 728 static const struct vb2_ops stk1160_video_qops = {
 729         .queue_setup            = queue_setup,
 730         .buf_queue              = buffer_queue,
 731         .start_streaming        = start_streaming,
 732         .stop_streaming         = stop_streaming,
 733         .wait_prepare           = vb2_ops_wait_prepare,
 734         .wait_finish            = vb2_ops_wait_finish,
 735 };
 736 
 737 static const struct video_device v4l_template = {
 738         .name = "stk1160",
 739         .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
 740         .fops = &stk1160_fops,
 741         .ioctl_ops = &stk1160_ioctl_ops,
 742         .release = video_device_release_empty,
 743 };
 744 
 745 /********************************************************************/
 746 
 747 /* Must be called with both v4l_lock and vb_queue_lock hold */
 748 void stk1160_clear_queue(struct stk1160 *dev)
 749 {
 750         struct stk1160_buffer *buf;
 751         unsigned long flags;
 752 
 753         /* Release all active buffers */
 754         spin_lock_irqsave(&dev->buf_lock, flags);
 755         while (!list_empty(&dev->avail_bufs)) {
 756                 buf = list_first_entry(&dev->avail_bufs,
 757                         struct stk1160_buffer, list);
 758                 list_del(&buf->list);
 759                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 760                 stk1160_dbg("buffer [%p/%d] aborted\n",
 761                             buf, buf->vb.vb2_buf.index);
 762         }
 763 
 764         /* It's important to release the current buffer */
 765         if (dev->isoc_ctl.buf) {
 766                 buf = dev->isoc_ctl.buf;
 767                 dev->isoc_ctl.buf = NULL;
 768 
 769                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 770                 stk1160_dbg("buffer [%p/%d] aborted\n",
 771                             buf, buf->vb.vb2_buf.index);
 772         }
 773         spin_unlock_irqrestore(&dev->buf_lock, flags);
 774 }
 775 
 776 int stk1160_vb2_setup(struct stk1160 *dev)
 777 {
 778         int rc;
 779         struct vb2_queue *q;
 780 
 781         q = &dev->vb_vidq;
 782         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 783         q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 784         q->drv_priv = dev;
 785         q->buf_struct_size = sizeof(struct stk1160_buffer);
 786         q->ops = &stk1160_video_qops;
 787         q->mem_ops = &vb2_vmalloc_memops;
 788         q->lock = &dev->vb_queue_lock;
 789         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 790 
 791         rc = vb2_queue_init(q);
 792         if (rc < 0)
 793                 return rc;
 794 
 795         /* initialize video dma queue */
 796         INIT_LIST_HEAD(&dev->avail_bufs);
 797 
 798         return 0;
 799 }
 800 
 801 int stk1160_video_register(struct stk1160 *dev)
 802 {
 803         int rc;
 804 
 805         /* Initialize video_device with a template structure */
 806         dev->vdev = v4l_template;
 807         dev->vdev.queue = &dev->vb_vidq;
 808 
 809         /*
 810          * Provide mutexes for v4l2 core and for videobuf2 queue.
 811          * It will be used to protect *only* v4l2 ioctls.
 812          */
 813         dev->vdev.lock = &dev->v4l_lock;
 814 
 815         /* This will be used to set video_device parent */
 816         dev->vdev.v4l2_dev = &dev->v4l2_dev;
 817         dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
 818                                 V4L2_CAP_READWRITE;
 819 
 820         /* NTSC is default */
 821         dev->norm = V4L2_STD_NTSC_M;
 822         dev->width = 720;
 823         dev->height = 480;
 824 
 825         /* set default format */
 826         dev->fmt = &format[0];
 827         stk1160_set_std(dev);
 828 
 829         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
 830                         dev->norm);
 831 
 832         video_set_drvdata(&dev->vdev, dev);
 833         rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
 834         if (rc < 0) {
 835                 stk1160_err("video_register_device failed (%d)\n", rc);
 836                 return rc;
 837         }
 838 
 839         v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
 840                   video_device_node_name(&dev->vdev));
 841 
 842         return 0;
 843 }