drivers/media/usb/usbtv/usbtv-video.c

   1 /*
   2  * Copyright (c) 2013 Lubomir Rintel
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions, and the following disclaimer,
  10  *    without modification.
  11  * 2. The name of the author may not be used to endorse or promote products
  12  *    derived from this software without specific prior written permission.
  13  *
  14  * Alternatively, this software may be distributed under the terms of the
  15  * GNU General Public License ("GPL").
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29 /*
  30  * Fushicai USBTV007 Audio-Video Grabber Driver
  31  *
  32  * Product web site:
  33  * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
  34  *
  35  * Following LWN articles were very useful in construction of this driver:
  36  * Video4Linux2 API series: http://lwn.net/Articles/203924/
  37  * videobuf2 API explanation: http://lwn.net/Articles/447435/
  38  * Thanks go to Jonathan Corbet for providing this quality documentation.
  39  * He is awesome.
  40  *
  41  * No physical hardware was harmed running Windows during the
  42  * reverse-engineering activity
  43  */
  44
  45 #include <media/v4l2-ioctl.h>
  46 #include <media/videobuf2-v4l2.h>
  47
  48 #include "usbtv.h"
  49
  50 static struct usbtv_norm_params norm_params[] = {
  51         {
  52                 .norm = V4L2_STD_525_60,
  53                 .cap_width = 720,
  54                 .cap_height = 480,
  55         },
  56         {
  57                 .norm = V4L2_STD_PAL,
  58                 .cap_width = 720,
  59                 .cap_height = 576,
  60         }
  61 };
  62
  63 static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm)
  64 {
  65         int i, ret = 0;
  66         struct usbtv_norm_params *params = NULL;
  67
  68         for (i = 0; i < ARRAY_SIZE(norm_params); i++) {
  69                 if (norm_params[i].norm & norm) {
  70                         params = &norm_params[i];
  71                         break;
  72                 }
  73         }
  74
  75         if (params) {
  76                 usbtv->width = params->cap_width;
  77                 usbtv->height = params->cap_height;
  78                 usbtv->n_chunks = usbtv->width * usbtv->height
  79                                                 / 4 / USBTV_CHUNK;
  80                 usbtv->norm = params->norm;
  81         } else
  82                 ret = -EINVAL;
  83
  84         return ret;
  85 }
  86
  87 static int usbtv_select_input(struct usbtv *usbtv, int input)
  88 {
  89         int ret;
  90
  91         static const u16 composite[][2] = {
  92                 { USBTV_BASE + 0x0105, 0x0060 },
  93                 { USBTV_BASE + 0x011f, 0x00f2 },
  94                 { USBTV_BASE + 0x0127, 0x0060 },
  95                 { USBTV_BASE + 0x00ae, 0x0010 },
  96                 { USBTV_BASE + 0x0239, 0x0060 },
  97         };
  98
  99         static const u16 svideo[][2] = {
 100                 { USBTV_BASE + 0x0105, 0x0010 },
 101                 { USBTV_BASE + 0x011f, 0x00ff },
 102                 { USBTV_BASE + 0x0127, 0x0060 },
 103                 { USBTV_BASE + 0x00ae, 0x0030 },
 104                 { USBTV_BASE + 0x0239, 0x0060 },
 105         };
 106
 107         switch (input) {
 108         case USBTV_COMPOSITE_INPUT:
 109                 ret = usbtv_set_regs(usbtv, composite, ARRAY_SIZE(composite));
 110                 break;
 111         case USBTV_SVIDEO_INPUT:
 112                 ret = usbtv_set_regs(usbtv, svideo, ARRAY_SIZE(svideo));
 113                 break;
 114         default:
 115                 ret = -EINVAL;
 116         }
 117
 118         if (!ret)
 119                 usbtv->input = input;
 120
 121         return ret;
 122 }
 123
 124 static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
 125 {
 126         int ret;
 127         static const u16 pal[][2] = {
 128                 { USBTV_BASE + 0x001a, 0x0068 },
 129                 { USBTV_BASE + 0x010e, 0x0072 },
 130                 { USBTV_BASE + 0x010f, 0x00a2 },
 131                 { USBTV_BASE + 0x0112, 0x00b0 },
 132                 { USBTV_BASE + 0x0117, 0x0001 },
 133                 { USBTV_BASE + 0x0118, 0x002c },
 134                 { USBTV_BASE + 0x012d, 0x0010 },
 135                 { USBTV_BASE + 0x012f, 0x0020 },
 136                 { USBTV_BASE + 0x024f, 0x0002 },
 137                 { USBTV_BASE + 0x0254, 0x0059 },
 138                 { USBTV_BASE + 0x025a, 0x0016 },
 139                 { USBTV_BASE + 0x025b, 0x0035 },
 140                 { USBTV_BASE + 0x0263, 0x0017 },
 141                 { USBTV_BASE + 0x0266, 0x0016 },
 142                 { USBTV_BASE + 0x0267, 0x0036 }
 143         };
 144
 145         static const u16 ntsc[][2] = {
 146                 { USBTV_BASE + 0x001a, 0x0079 },
 147                 { USBTV_BASE + 0x010e, 0x0068 },
 148                 { USBTV_BASE + 0x010f, 0x009c },
 149                 { USBTV_BASE + 0x0112, 0x00f0 },
 150                 { USBTV_BASE + 0x0117, 0x0000 },
 151                 { USBTV_BASE + 0x0118, 0x00fc },
 152                 { USBTV_BASE + 0x012d, 0x0004 },
 153                 { USBTV_BASE + 0x012f, 0x0008 },
 154                 { USBTV_BASE + 0x024f, 0x0001 },
 155                 { USBTV_BASE + 0x0254, 0x005f },
 156                 { USBTV_BASE + 0x025a, 0x0012 },
 157                 { USBTV_BASE + 0x025b, 0x0001 },
 158                 { USBTV_BASE + 0x0263, 0x001c },
 159                 { USBTV_BASE + 0x0266, 0x0011 },
 160                 { USBTV_BASE + 0x0267, 0x0005 }
 161         };
 162
 163         ret = usbtv_configure_for_norm(usbtv, norm);
 164
 165         if (!ret) {
 166                 if (norm & V4L2_STD_525_60)
 167                         ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
 168                 else if (norm & V4L2_STD_PAL)
 169                         ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
 170         }
 171
 172         return ret;
 173 }
 174
 175 static int usbtv_setup_capture(struct usbtv *usbtv)
 176 {
 177         int ret;
 178         static const u16 setup[][2] = {
 179                 /* These seem to enable the device. */
 180                 { USBTV_BASE + 0x0008, 0x0001 },
 181                 { USBTV_BASE + 0x01d0, 0x00ff },
 182                 { USBTV_BASE + 0x01d9, 0x0002 },
 183
 184                 /* These seem to influence color parameters, such as
 185                  * brightness, etc. */
 186                 { USBTV_BASE + 0x0239, 0x0040 },
 187                 { USBTV_BASE + 0x0240, 0x0000 },
 188                 { USBTV_BASE + 0x0241, 0x0000 },
 189                 { USBTV_BASE + 0x0242, 0x0002 },
 190                 { USBTV_BASE + 0x0243, 0x0080 },
 191                 { USBTV_BASE + 0x0244, 0x0012 },
 192                 { USBTV_BASE + 0x0245, 0x0090 },
 193                 { USBTV_BASE + 0x0246, 0x0000 },
 194
 195                 { USBTV_BASE + 0x0278, 0x002d },
 196                 { USBTV_BASE + 0x0279, 0x000a },
 197                 { USBTV_BASE + 0x027a, 0x0032 },
 198                 { 0xf890, 0x000c },
 199                 { 0xf894, 0x0086 },
 200
 201                 { USBTV_BASE + 0x00ac, 0x00c0 },
 202                 { USBTV_BASE + 0x00ad, 0x0000 },
 203                 { USBTV_BASE + 0x00a2, 0x0012 },
 204                 { USBTV_BASE + 0x00a3, 0x00e0 },
 205                 { USBTV_BASE + 0x00a4, 0x0028 },
 206                 { USBTV_BASE + 0x00a5, 0x0082 },
 207                 { USBTV_BASE + 0x00a7, 0x0080 },
 208                 { USBTV_BASE + 0x0000, 0x0014 },
 209                 { USBTV_BASE + 0x0006, 0x0003 },
 210                 { USBTV_BASE + 0x0090, 0x0099 },
 211                 { USBTV_BASE + 0x0091, 0x0090 },
 212                 { USBTV_BASE + 0x0094, 0x0068 },
 213                 { USBTV_BASE + 0x0095, 0x0070 },
 214                 { USBTV_BASE + 0x009c, 0x0030 },
 215                 { USBTV_BASE + 0x009d, 0x00c0 },
 216                 { USBTV_BASE + 0x009e, 0x00e0 },
 217                 { USBTV_BASE + 0x0019, 0x0006 },
 218                 { USBTV_BASE + 0x008c, 0x00ba },
 219                 { USBTV_BASE + 0x0101, 0x00ff },
 220                 { USBTV_BASE + 0x010c, 0x00b3 },
 221                 { USBTV_BASE + 0x01b2, 0x0080 },
 222                 { USBTV_BASE + 0x01b4, 0x00a0 },
 223                 { USBTV_BASE + 0x014c, 0x00ff },
 224                 { USBTV_BASE + 0x014d, 0x00ca },
 225                 { USBTV_BASE + 0x0113, 0x0053 },
 226                 { USBTV_BASE + 0x0119, 0x008a },
 227                 { USBTV_BASE + 0x013c, 0x0003 },
 228                 { USBTV_BASE + 0x0150, 0x009c },
 229                 { USBTV_BASE + 0x0151, 0x0071 },
 230                 { USBTV_BASE + 0x0152, 0x00c6 },
 231                 { USBTV_BASE + 0x0153, 0x0084 },
 232                 { USBTV_BASE + 0x0154, 0x00bc },
 233                 { USBTV_BASE + 0x0155, 0x00a0 },
 234                 { USBTV_BASE + 0x0156, 0x00a0 },
 235                 { USBTV_BASE + 0x0157, 0x009c },
 236                 { USBTV_BASE + 0x0158, 0x001f },
 237                 { USBTV_BASE + 0x0159, 0x0006 },
 238                 { USBTV_BASE + 0x015d, 0x0000 },
 239
 240                 { USBTV_BASE + 0x0003, 0x0004 },
 241                 { USBTV_BASE + 0x0100, 0x00d3 },
 242                 { USBTV_BASE + 0x0115, 0x0015 },
 243                 { USBTV_BASE + 0x0220, 0x002e },
 244                 { USBTV_BASE + 0x0225, 0x0008 },
 245                 { USBTV_BASE + 0x024e, 0x0002 },
 246                 { USBTV_BASE + 0x024e, 0x0002 },
 247                 { USBTV_BASE + 0x024f, 0x0002 },
 248         };
 249
 250         ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
 251         if (ret)
 252                 return ret;
 253
 254         ret = usbtv_select_norm(usbtv, usbtv->norm);
 255         if (ret)
 256                 return ret;
 257
 258         ret = usbtv_select_input(usbtv, usbtv->input);
 259         if (ret)
 260                 return ret;
 261
 262         return 0;
 263 }
 264
 265 /* Copy data from chunk into a frame buffer, deinterlacing the data
 266  * into every second line. Unfortunately, they don't align nicely into
 267  * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
 268  * Therefore, we break down the chunk into two halves before copying,
 269  * so that we can interleave a line if needed.
 270  *
 271  * Each "chunk" is 240 words; a word in this context equals 4 bytes.
 272  * Image format is YUYV/YUV 4:2:2, consisting of Y Cr Y Cb, defining two
 273  * pixels, the Cr and Cb shared between the two pixels, but each having
 274  * separate Y values. Thus, the 240 words equal 480 pixels. It therefore,
 275  * takes 1.5 chunks to make a 720 pixel-wide line for the frame.
 276  * The image is interlaced, so there is a "scan" of odd lines, followed
 277  * by "scan" of even numbered lines.
 278  *
 279  * Following code is writing the chunks in correct sequence, skipping
 280  * the rows based on "odd" value.
 281  * line 1: chunk[0][  0..479] chunk[0][480..959] chunk[1][  0..479]
 282  * line 3: chunk[1][480..959] chunk[2][  0..479] chunk[2][480..959]
 283  * ...etc.
 284  */
 285 static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd)
 286 {
 287         int half;
 288
 289         for (half = 0; half < 2; half++) {
 290                 int part_no = chunk_no * 2 + half;
 291                 int line = part_no / 3;
 292                 int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
 293
 294                 u32 *dst = &frame[part_index * USBTV_CHUNK/2];
 295
 296                 memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
 297                 src += USBTV_CHUNK/2;
 298         }
 299 }
 300
 301 /* Called for each 256-byte image chunk.
 302  * First word identifies the chunk, followed by 240 words of image
 303  * data and padding. */
 304 static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
 305 {
 306         int frame_id, odd, chunk_no;
 307         u32 *frame;
 308         struct usbtv_buf *buf;
 309         unsigned long flags;
 310
 311         /* Ignore corrupted lines. */
 312         if (!USBTV_MAGIC_OK(chunk))
 313                 return;
 314         frame_id = USBTV_FRAME_ID(chunk);
 315         odd = USBTV_ODD(chunk);
 316         chunk_no = USBTV_CHUNK_NO(chunk);
 317         if (chunk_no >= usbtv->n_chunks)
 318                 return;
 319
 320         /* Beginning of a frame. */
 321         if (chunk_no == 0) {
 322                 usbtv->frame_id = frame_id;
 323                 usbtv->chunks_done = 0;
 324         }
 325
 326         if (usbtv->frame_id != frame_id)
 327                 return;
 328
 329         spin_lock_irqsave(&usbtv->buflock, flags);
 330         if (list_empty(&usbtv->bufs)) {
 331                 /* No free buffers. Userspace likely too slow. */
 332                 spin_unlock_irqrestore(&usbtv->buflock, flags);
 333                 return;
 334         }
 335
 336         /* First available buffer. */
 337         buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
 338         frame = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 339
 340         /* Copy the chunk data. */
 341         usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
 342         usbtv->chunks_done++;
 343
 344         /* Last chunk in a field */
 345         if (chunk_no == usbtv->n_chunks-1) {
 346                 /* Last chunk in a frame, signalling an end */
 347                 if (odd && !usbtv->last_odd) {
 348                         int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 349                         enum vb2_buffer_state state = usbtv->chunks_done ==
 350                                 usbtv->n_chunks ?
 351                                 VB2_BUF_STATE_DONE :
 352                                 VB2_BUF_STATE_ERROR;
 353
 354                         buf->vb.field = V4L2_FIELD_INTERLACED;
 355                         buf->vb.sequence = usbtv->sequence++;
 356                         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 357                         vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
 358                         vb2_buffer_done(&buf->vb.vb2_buf, state);
 359                         list_del(&buf->list);
 360                 }
 361                 usbtv->last_odd = odd;
 362         }
 363
 364         spin_unlock_irqrestore(&usbtv->buflock, flags);
 365 }
 366
 367 /* Got image data. Each packet contains a number of 256-word chunks we
 368  * compose the image from. */
 369 static void usbtv_iso_cb(struct urb *ip)
 370 {
 371         int ret;
 372         int i;
 373         struct usbtv *usbtv = (struct usbtv *)ip->context;
 374
 375         switch (ip->status) {
 376         /* All fine. */
 377         case 0:
 378                 break;
 379         /* Device disconnected or capture stopped? */
 380         case -ENODEV:
 381         case -ENOENT:
 382         case -ECONNRESET:
 383         case -ESHUTDOWN:
 384                 return;
 385         /* Unknown error. Retry. */
 386         default:
 387                 dev_warn(usbtv->dev, "Bad response for ISO request.\n");
 388                 goto resubmit;
 389         }
 390
 391         for (i = 0; i < ip->number_of_packets; i++) {
 392                 int size = ip->iso_frame_desc[i].actual_length;
 393                 unsigned char *data = ip->transfer_buffer +
 394                                 ip->iso_frame_desc[i].offset;
 395                 int offset;
 396
 397                 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
 398                         usbtv_image_chunk(usbtv,
 399                                 (__be32 *)&data[USBTV_CHUNK_SIZE * offset]);
 400         }
 401
 402 resubmit:
 403         ret = usb_submit_urb(ip, GFP_ATOMIC);
 404         if (ret < 0)
 405                 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
 406 }
 407
 408 static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
 409 {
 410         struct urb *ip;
 411         int size = usbtv->iso_size;
 412         int i;
 413
 414         ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
 415         if (ip == NULL)
 416                 return NULL;
 417
 418         ip->dev = usbtv->udev;
 419         ip->context = usbtv;
 420         ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
 421         ip->interval = 1;
 422         ip->transfer_flags = URB_ISO_ASAP;
 423         ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
 424                                                 GFP_KERNEL);
 425         if (!ip->transfer_buffer) {
 426                 usb_free_urb(ip);
 427                 return NULL;
 428         }
 429         ip->complete = usbtv_iso_cb;
 430         ip->number_of_packets = USBTV_ISOC_PACKETS;
 431         ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
 432         for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
 433                 ip->iso_frame_desc[i].offset = size * i;
 434                 ip->iso_frame_desc[i].length = size;
 435         }
 436
 437         return ip;
 438 }
 439
 440 static void usbtv_stop(struct usbtv *usbtv)
 441 {
 442         int i;
 443         unsigned long flags;
 444
 445         /* Cancel running transfers. */
 446         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 447                 struct urb *ip = usbtv->isoc_urbs[i];
 448
 449                 if (ip == NULL)
 450                         continue;
 451                 usb_kill_urb(ip);
 452                 kfree(ip->transfer_buffer);
 453                 usb_free_urb(ip);
 454                 usbtv->isoc_urbs[i] = NULL;
 455         }
 456
 457         /* Return buffers to userspace. */
 458         spin_lock_irqsave(&usbtv->buflock, flags);
 459         while (!list_empty(&usbtv->bufs)) {
 460                 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
 461                                                 struct usbtv_buf, list);
 462                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 463                 list_del(&buf->list);
 464         }
 465         spin_unlock_irqrestore(&usbtv->buflock, flags);
 466 }
 467
 468 static int usbtv_start(struct usbtv *usbtv)
 469 {
 470         int i;
 471         int ret;
 472
 473         usbtv_audio_suspend(usbtv);
 474
 475         ret = usb_set_interface(usbtv->udev, 0, 0);
 476         if (ret < 0)
 477                 return ret;
 478
 479         ret = usbtv_setup_capture(usbtv);
 480         if (ret < 0)
 481                 return ret;
 482
 483         ret = usb_set_interface(usbtv->udev, 0, 1);
 484         if (ret < 0)
 485                 return ret;
 486
 487         usbtv_audio_resume(usbtv);
 488
 489         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 490                 struct urb *ip;
 491
 492                 ip = usbtv_setup_iso_transfer(usbtv);
 493                 if (ip == NULL) {
 494                         ret = -ENOMEM;
 495                         goto start_fail;
 496                 }
 497                 usbtv->isoc_urbs[i] = ip;
 498
 499                 ret = usb_submit_urb(ip, GFP_KERNEL);
 500                 if (ret < 0)
 501                         goto start_fail;
 502         }
 503
 504         return 0;
 505
 506 start_fail:
 507         usbtv_stop(usbtv);
 508         return ret;
 509 }
 510
 511 static int usbtv_querycap(struct file *file, void *priv,
 512                                 struct v4l2_capability *cap)
 513 {
 514         struct usbtv *dev = video_drvdata(file);
 515
 516         strlcpy(cap->driver, "usbtv", sizeof(cap->driver));
 517         strlcpy(cap->card, "usbtv", sizeof(cap->card));
 518         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 519         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE;
 520         cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 521         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 522         return 0;
 523 }
 524
 525 static int usbtv_enum_input(struct file *file, void *priv,
 526                                         struct v4l2_input *i)
 527 {
 528         struct usbtv *dev = video_drvdata(file);
 529
 530         switch (i->index) {
 531         case USBTV_COMPOSITE_INPUT:
 532                 strlcpy(i->name, "Composite", sizeof(i->name));
 533                 break;
 534         case USBTV_SVIDEO_INPUT:
 535                 strlcpy(i->name, "S-Video", sizeof(i->name));
 536                 break;
 537         default:
 538                 return -EINVAL;
 539         }
 540
 541         i->type = V4L2_INPUT_TYPE_CAMERA;
 542         i->std = dev->vdev.tvnorms;
 543         return 0;
 544 }
 545
 546 static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
 547                                         struct v4l2_fmtdesc *f)
 548 {
 549         if (f->index > 0)
 550                 return -EINVAL;
 551
 552         strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed",
 553                                         sizeof(f->description));
 554         f->pixelformat = V4L2_PIX_FMT_YUYV;
 555         return 0;
 556 }
 557
 558 static int usbtv_fmt_vid_cap(struct file *file, void *priv,
 559                                         struct v4l2_format *f)
 560 {
 561         struct usbtv *usbtv = video_drvdata(file);
 562
 563         f->fmt.pix.width = usbtv->width;
 564         f->fmt.pix.height = usbtv->height;
 565         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 566         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 567         f->fmt.pix.bytesperline = usbtv->width * 2;
 568         f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
 569         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 570
 571         return 0;
 572 }
 573
 574 static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 575 {
 576         struct usbtv *usbtv = video_drvdata(file);
 577         *norm = usbtv->norm;
 578         return 0;
 579 }
 580
 581 static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
 582 {
 583         int ret = -EINVAL;
 584         struct usbtv *usbtv = video_drvdata(file);
 585
 586         if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL))
 587                 ret = usbtv_select_norm(usbtv, norm);
 588
 589         return ret;
 590 }
 591
 592 static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
 593 {
 594         struct usbtv *usbtv = video_drvdata(file);
 595         *i = usbtv->input;
 596         return 0;
 597 }
 598
 599 static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
 600 {
 601         struct usbtv *usbtv = video_drvdata(file);
 602
 603         return usbtv_select_input(usbtv, i);
 604 }
 605
 606 static struct v4l2_ioctl_ops usbtv_ioctl_ops = {
 607         .vidioc_querycap = usbtv_querycap,
 608         .vidioc_enum_input = usbtv_enum_input,
 609         .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
 610         .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
 611         .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
 612         .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
 613         .vidioc_g_std = usbtv_g_std,
 614         .vidioc_s_std = usbtv_s_std,
 615         .vidioc_g_input = usbtv_g_input,
 616         .vidioc_s_input = usbtv_s_input,
 617
 618         .vidioc_reqbufs = vb2_ioctl_reqbufs,
 619         .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
 620         .vidioc_querybuf = vb2_ioctl_querybuf,
 621         .vidioc_create_bufs = vb2_ioctl_create_bufs,
 622         .vidioc_qbuf = vb2_ioctl_qbuf,
 623         .vidioc_dqbuf = vb2_ioctl_dqbuf,
 624         .vidioc_streamon = vb2_ioctl_streamon,
 625         .vidioc_streamoff = vb2_ioctl_streamoff,
 626 };
 627
 628 static struct v4l2_file_operations usbtv_fops = {
 629         .owner = THIS_MODULE,
 630         .unlocked_ioctl = video_ioctl2,
 631         .mmap = vb2_fop_mmap,
 632         .open = v4l2_fh_open,
 633         .release = vb2_fop_release,
 634         .read = vb2_fop_read,
 635         .poll = vb2_fop_poll,
 636 };
 637
 638 static int usbtv_queue_setup(struct vb2_queue *vq,
 639         unsigned int *nbuffers,
 640         unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
 641 {
 642         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 643         unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
 644
 645         if (vq->num_buffers + *nbuffers < 2)
 646                 *nbuffers = 2 - vq->num_buffers;
 647         if (*nplanes)
 648                 return sizes[0] < size ? -EINVAL : 0;
 649         *nplanes = 1;
 650         sizes[0] = size;
 651
 652         return 0;
 653 }
 654
 655 static void usbtv_buf_queue(struct vb2_buffer *vb)
 656 {
 657         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 658         struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
 659         struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb);
 660         unsigned long flags;
 661
 662         if (usbtv->udev == NULL) {
 663                 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 664                 return;
 665         }
 666
 667         spin_lock_irqsave(&usbtv->buflock, flags);
 668         list_add_tail(&buf->list, &usbtv->bufs);
 669         spin_unlock_irqrestore(&usbtv->buflock, flags);
 670 }
 671
 672 static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
 673 {
 674         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 675
 676         if (usbtv->udev == NULL)
 677                 return -ENODEV;
 678
 679         usbtv->last_odd = 1;
 680         usbtv->sequence = 0;
 681         return usbtv_start(usbtv);
 682 }
 683
 684 static void usbtv_stop_streaming(struct vb2_queue *vq)
 685 {
 686         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 687
 688         if (usbtv->udev)
 689                 usbtv_stop(usbtv);
 690 }
 691
 692 static const struct vb2_ops usbtv_vb2_ops = {
 693         .queue_setup = usbtv_queue_setup,
 694         .buf_queue = usbtv_buf_queue,
 695         .start_streaming = usbtv_start_streaming,
 696         .stop_streaming = usbtv_stop_streaming,
 697 };
 698
 699 static void usbtv_release(struct v4l2_device *v4l2_dev)
 700 {
 701         struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
 702
 703         v4l2_device_unregister(&usbtv->v4l2_dev);
 704         vb2_queue_release(&usbtv->vb2q);
 705         kfree(usbtv);
 706 }
 707
 708 int usbtv_video_init(struct usbtv *usbtv)
 709 {
 710         int ret;
 711
 712         (void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);
 713
 714         spin_lock_init(&usbtv->buflock);
 715         mutex_init(&usbtv->v4l2_lock);
 716         mutex_init(&usbtv->vb2q_lock);
 717         INIT_LIST_HEAD(&usbtv->bufs);
 718
 719         /* videobuf2 structure */
 720         usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 721         usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
 722         usbtv->vb2q.drv_priv = usbtv;
 723         usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
 724         usbtv->vb2q.ops = &usbtv_vb2_ops;
 725         usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
 726         usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 727         usbtv->vb2q.lock = &usbtv->vb2q_lock;
 728         ret = vb2_queue_init(&usbtv->vb2q);
 729         if (ret < 0) {
 730                 dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
 731                 return ret;
 732         }
 733
 734         /* v4l2 structure */
 735         usbtv->v4l2_dev.release = usbtv_release;
 736         ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
 737         if (ret < 0) {
 738                 dev_warn(usbtv->dev, "Could not register v4l2 device\n");
 739                 goto v4l2_fail;
 740         }
 741
 742         /* Video structure */
 743         strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
 744         usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
 745         usbtv->vdev.release = video_device_release_empty;
 746         usbtv->vdev.fops = &usbtv_fops;
 747         usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
 748         usbtv->vdev.tvnorms = USBTV_TV_STD;
 749         usbtv->vdev.queue = &usbtv->vb2q;
 750         usbtv->vdev.lock = &usbtv->v4l2_lock;
 751         video_set_drvdata(&usbtv->vdev, usbtv);
 752         ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
 753         if (ret < 0) {
 754                 dev_warn(usbtv->dev, "Could not register video device\n");
 755                 goto vdev_fail;
 756         }
 757
 758         return 0;
 759
 760 vdev_fail:
 761         v4l2_device_unregister(&usbtv->v4l2_dev);
 762 v4l2_fail:
 763         vb2_queue_release(&usbtv->vb2q);
 764
 765         return ret;
 766 }
 767
 768 void usbtv_video_free(struct usbtv *usbtv)
 769 {
 770         mutex_lock(&usbtv->vb2q_lock);
 771         mutex_lock(&usbtv->v4l2_lock);
 772
 773         usbtv_stop(usbtv);
 774         video_unregister_device(&usbtv->vdev);
 775         v4l2_device_disconnect(&usbtv->v4l2_dev);
 776
 777         mutex_unlock(&usbtv->v4l2_lock);
 778         mutex_unlock(&usbtv->vb2q_lock);
 779
 780         v4l2_device_put(&usbtv->v4l2_dev);
 781 }