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

   1 /*
   2  * Copyright (c) 2013,2016 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 const 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_625_50,
  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         const 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 = 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 uint16_t usbtv_norm_to_16f_reg(v4l2_std_id norm)
 125 {
 126         /* NTSC M/M-JP/M-KR */
 127         if (norm & V4L2_STD_NTSC)
 128                 return 0x00b8;
 129         /* PAL BG/DK/H/I */
 130         if (norm & V4L2_STD_PAL)
 131                 return 0x00ee;
 132         /* SECAM B/D/G/H/K/K1/L/Lc */
 133         if (norm & V4L2_STD_SECAM)
 134                 return 0x00ff;
 135         if (norm & V4L2_STD_NTSC_443)
 136                 return 0x00a8;
 137         if (norm & (V4L2_STD_PAL_M | V4L2_STD_PAL_60))
 138                 return 0x00bc;
 139         if (norm & V4L2_STD_PAL_Nc)
 140                 return 0x00fe;
 141         /* Fallback to automatic detection for other standards */
 142         return 0x0000;
 143 }
 144
 145 static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
 146 {
 147         int ret;
 148         /* These are the series of register values used to configure the
 149          * decoder for a specific standard.
 150          * The first 21 register writes are copied from the
 151          * Settings\DecoderDefaults registry keys present in the Windows driver
 152          * .INF file, and control various image tuning parameters (color
 153          * correction, sharpness, ...).
 154          */
 155         static const u16 pal[][2] = {
 156                 /* "AVPAL" tuning sequence from .INF file */
 157                 { USBTV_BASE + 0x0003, 0x0004 },
 158                 { USBTV_BASE + 0x001a, 0x0068 },
 159                 { USBTV_BASE + 0x0100, 0x00d3 },
 160                 { USBTV_BASE + 0x010e, 0x0072 },
 161                 { USBTV_BASE + 0x010f, 0x00a2 },
 162                 { USBTV_BASE + 0x0112, 0x00b0 },
 163                 { USBTV_BASE + 0x0115, 0x0015 },
 164                 { USBTV_BASE + 0x0117, 0x0001 },
 165                 { USBTV_BASE + 0x0118, 0x002c },
 166                 { USBTV_BASE + 0x012d, 0x0010 },
 167                 { USBTV_BASE + 0x012f, 0x0020 },
 168                 { USBTV_BASE + 0x0220, 0x002e },
 169                 { USBTV_BASE + 0x0225, 0x0008 },
 170                 { USBTV_BASE + 0x024e, 0x0002 },
 171                 { USBTV_BASE + 0x024f, 0x0002 },
 172                 { USBTV_BASE + 0x0254, 0x0059 },
 173                 { USBTV_BASE + 0x025a, 0x0016 },
 174                 { USBTV_BASE + 0x025b, 0x0035 },
 175                 { USBTV_BASE + 0x0263, 0x0017 },
 176                 { USBTV_BASE + 0x0266, 0x0016 },
 177                 { USBTV_BASE + 0x0267, 0x0036 },
 178                 /* End image tuning */
 179                 { USBTV_BASE + 0x024e, 0x0002 },
 180                 { USBTV_BASE + 0x024f, 0x0002 },
 181         };
 182
 183         static const u16 ntsc[][2] = {
 184                 /* "AVNTSC" tuning sequence from .INF file */
 185                 { USBTV_BASE + 0x0003, 0x0004 },
 186                 { USBTV_BASE + 0x001a, 0x0079 },
 187                 { USBTV_BASE + 0x0100, 0x00d3 },
 188                 { USBTV_BASE + 0x010e, 0x0068 },
 189                 { USBTV_BASE + 0x010f, 0x009c },
 190                 { USBTV_BASE + 0x0112, 0x00f0 },
 191                 { USBTV_BASE + 0x0115, 0x0015 },
 192                 { USBTV_BASE + 0x0117, 0x0000 },
 193                 { USBTV_BASE + 0x0118, 0x00fc },
 194                 { USBTV_BASE + 0x012d, 0x0004 },
 195                 { USBTV_BASE + 0x012f, 0x0008 },
 196                 { USBTV_BASE + 0x0220, 0x002e },
 197                 { USBTV_BASE + 0x0225, 0x0008 },
 198                 { USBTV_BASE + 0x024e, 0x0002 },
 199                 { USBTV_BASE + 0x024f, 0x0001 },
 200                 { USBTV_BASE + 0x0254, 0x005f },
 201                 { USBTV_BASE + 0x025a, 0x0012 },
 202                 { USBTV_BASE + 0x025b, 0x0001 },
 203                 { USBTV_BASE + 0x0263, 0x001c },
 204                 { USBTV_BASE + 0x0266, 0x0011 },
 205                 { USBTV_BASE + 0x0267, 0x0005 },
 206                 /* End image tuning */
 207                 { USBTV_BASE + 0x024e, 0x0002 },
 208                 { USBTV_BASE + 0x024f, 0x0002 },
 209         };
 210
 211         static const u16 secam[][2] = {
 212                 /* "AVSECAM" tuning sequence from .INF file */
 213                 { USBTV_BASE + 0x0003, 0x0004 },
 214                 { USBTV_BASE + 0x001a, 0x0073 },
 215                 { USBTV_BASE + 0x0100, 0x00dc },
 216                 { USBTV_BASE + 0x010e, 0x0072 },
 217                 { USBTV_BASE + 0x010f, 0x00a2 },
 218                 { USBTV_BASE + 0x0112, 0x0090 },
 219                 { USBTV_BASE + 0x0115, 0x0035 },
 220                 { USBTV_BASE + 0x0117, 0x0001 },
 221                 { USBTV_BASE + 0x0118, 0x0030 },
 222                 { USBTV_BASE + 0x012d, 0x0004 },
 223                 { USBTV_BASE + 0x012f, 0x0008 },
 224                 { USBTV_BASE + 0x0220, 0x002d },
 225                 { USBTV_BASE + 0x0225, 0x0028 },
 226                 { USBTV_BASE + 0x024e, 0x0008 },
 227                 { USBTV_BASE + 0x024f, 0x0002 },
 228                 { USBTV_BASE + 0x0254, 0x0069 },
 229                 { USBTV_BASE + 0x025a, 0x0016 },
 230                 { USBTV_BASE + 0x025b, 0x0035 },
 231                 { USBTV_BASE + 0x0263, 0x0021 },
 232                 { USBTV_BASE + 0x0266, 0x0016 },
 233                 { USBTV_BASE + 0x0267, 0x0036 },
 234                 /* End image tuning */
 235                 { USBTV_BASE + 0x024e, 0x0002 },
 236                 { USBTV_BASE + 0x024f, 0x0002 },
 237         };
 238
 239         ret = usbtv_configure_for_norm(usbtv, norm);
 240
 241         if (!ret) {
 242                 /* Masks for norms using a NTSC or PAL color encoding. */
 243                 static const v4l2_std_id ntsc_mask =
 244                         V4L2_STD_NTSC | V4L2_STD_NTSC_443;
 245                 static const v4l2_std_id pal_mask =
 246                         V4L2_STD_PAL | V4L2_STD_PAL_60 | V4L2_STD_PAL_M |
 247                         V4L2_STD_PAL_Nc;
 248
 249                 if (norm & ntsc_mask)
 250                         ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
 251                 else if (norm & pal_mask)
 252                         ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
 253                 else if (norm & V4L2_STD_SECAM)
 254                         ret = usbtv_set_regs(usbtv, secam, ARRAY_SIZE(secam));
 255                 else
 256                         ret = -EINVAL;
 257         }
 258
 259         if (!ret) {
 260                 /* Configure the decoder for the color standard */
 261                 const u16 cfg[][2] = {
 262                         { USBTV_BASE + 0x016f, usbtv_norm_to_16f_reg(norm) }
 263                 };
 264                 ret = usbtv_set_regs(usbtv, cfg, ARRAY_SIZE(cfg));
 265         }
 266
 267         return ret;
 268 }
 269
 270 static int usbtv_setup_capture(struct usbtv *usbtv)
 271 {
 272         int ret;
 273         static const u16 setup[][2] = {
 274                 /* These seem to enable the device. */
 275                 { USBTV_BASE + 0x0008, 0x0001 },
 276                 { USBTV_BASE + 0x01d0, 0x00ff },
 277                 { USBTV_BASE + 0x01d9, 0x0002 },
 278
 279                 /* These seem to influence color parameters, such as
 280                  * brightness, etc. */
 281                 { USBTV_BASE + 0x0239, 0x0040 },
 282                 { USBTV_BASE + 0x0240, 0x0000 },
 283                 { USBTV_BASE + 0x0241, 0x0000 },
 284                 { USBTV_BASE + 0x0242, 0x0002 },
 285                 { USBTV_BASE + 0x0243, 0x0080 },
 286                 { USBTV_BASE + 0x0244, 0x0012 },
 287                 { USBTV_BASE + 0x0245, 0x0090 },
 288                 { USBTV_BASE + 0x0246, 0x0000 },
 289
 290                 { USBTV_BASE + 0x0278, 0x002d },
 291                 { USBTV_BASE + 0x0279, 0x000a },
 292                 { USBTV_BASE + 0x027a, 0x0032 },
 293                 { 0xf890, 0x000c },
 294                 { 0xf894, 0x0086 },
 295
 296                 { USBTV_BASE + 0x00ac, 0x00c0 },
 297                 { USBTV_BASE + 0x00ad, 0x0000 },
 298                 { USBTV_BASE + 0x00a2, 0x0012 },
 299                 { USBTV_BASE + 0x00a3, 0x00e0 },
 300                 { USBTV_BASE + 0x00a4, 0x0028 },
 301                 { USBTV_BASE + 0x00a5, 0x0082 },
 302                 { USBTV_BASE + 0x00a7, 0x0080 },
 303                 { USBTV_BASE + 0x0000, 0x0014 },
 304                 { USBTV_BASE + 0x0006, 0x0003 },
 305                 { USBTV_BASE + 0x0090, 0x0099 },
 306                 { USBTV_BASE + 0x0091, 0x0090 },
 307                 { USBTV_BASE + 0x0094, 0x0068 },
 308                 { USBTV_BASE + 0x0095, 0x0070 },
 309                 { USBTV_BASE + 0x009c, 0x0030 },
 310                 { USBTV_BASE + 0x009d, 0x00c0 },
 311                 { USBTV_BASE + 0x009e, 0x00e0 },
 312                 { USBTV_BASE + 0x0019, 0x0006 },
 313                 { USBTV_BASE + 0x008c, 0x00ba },
 314                 { USBTV_BASE + 0x0101, 0x00ff },
 315                 { USBTV_BASE + 0x010c, 0x00b3 },
 316                 { USBTV_BASE + 0x01b2, 0x0080 },
 317                 { USBTV_BASE + 0x01b4, 0x00a0 },
 318                 { USBTV_BASE + 0x014c, 0x00ff },
 319                 { USBTV_BASE + 0x014d, 0x00ca },
 320                 { USBTV_BASE + 0x0113, 0x0053 },
 321                 { USBTV_BASE + 0x0119, 0x008a },
 322                 { USBTV_BASE + 0x013c, 0x0003 },
 323                 { USBTV_BASE + 0x0150, 0x009c },
 324                 { USBTV_BASE + 0x0151, 0x0071 },
 325                 { USBTV_BASE + 0x0152, 0x00c6 },
 326                 { USBTV_BASE + 0x0153, 0x0084 },
 327                 { USBTV_BASE + 0x0154, 0x00bc },
 328                 { USBTV_BASE + 0x0155, 0x00a0 },
 329                 { USBTV_BASE + 0x0156, 0x00a0 },
 330                 { USBTV_BASE + 0x0157, 0x009c },
 331                 { USBTV_BASE + 0x0158, 0x001f },
 332                 { USBTV_BASE + 0x0159, 0x0006 },
 333                 { USBTV_BASE + 0x015d, 0x0000 },
 334         };
 335
 336         ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
 337         if (ret)
 338                 return ret;
 339
 340         ret = usbtv_select_norm(usbtv, usbtv->norm);
 341         if (ret)
 342                 return ret;
 343
 344         ret = usbtv_select_input(usbtv, usbtv->input);
 345         if (ret)
 346                 return ret;
 347
 348         ret = v4l2_ctrl_handler_setup(&usbtv->ctrl);
 349         if (ret)
 350                 return ret;
 351
 352         return 0;
 353 }
 354
 355 /* Copy data from chunk into a frame buffer, deinterlacing the data
 356  * into every second line. Unfortunately, they don't align nicely into
 357  * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
 358  * Therefore, we break down the chunk into two halves before copying,
 359  * so that we can interleave a line if needed.
 360  *
 361  * Each "chunk" is 240 words; a word in this context equals 4 bytes.
 362  * Image format is YUYV/YUV 4:2:2, consisting of Y Cr Y Cb, defining two
 363  * pixels, the Cr and Cb shared between the two pixels, but each having
 364  * separate Y values. Thus, the 240 words equal 480 pixels. It therefore,
 365  * takes 1.5 chunks to make a 720 pixel-wide line for the frame.
 366  * The image is interlaced, so there is a "scan" of odd lines, followed
 367  * by "scan" of even numbered lines.
 368  *
 369  * Following code is writing the chunks in correct sequence, skipping
 370  * the rows based on "odd" value.
 371  * line 1: chunk[0][  0..479] chunk[0][480..959] chunk[1][  0..479]
 372  * line 3: chunk[1][480..959] chunk[2][  0..479] chunk[2][480..959]
 373  * ...etc.
 374  */
 375 static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd)
 376 {
 377         int half;
 378
 379         for (half = 0; half < 2; half++) {
 380                 int part_no = chunk_no * 2 + half;
 381                 int line = part_no / 3;
 382                 int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
 383
 384                 u32 *dst = &frame[part_index * USBTV_CHUNK/2];
 385
 386                 memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
 387                 src += USBTV_CHUNK/2;
 388         }
 389 }
 390
 391 /* Called for each 256-byte image chunk.
 392  * First word identifies the chunk, followed by 240 words of image
 393  * data and padding. */
 394 static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
 395 {
 396         int frame_id, odd, chunk_no;
 397         u32 *frame;
 398         struct usbtv_buf *buf;
 399         unsigned long flags;
 400
 401         /* Ignore corrupted lines. */
 402         if (!USBTV_MAGIC_OK(chunk))
 403                 return;
 404         frame_id = USBTV_FRAME_ID(chunk);
 405         odd = USBTV_ODD(chunk);
 406         chunk_no = USBTV_CHUNK_NO(chunk);
 407         if (chunk_no >= usbtv->n_chunks)
 408                 return;
 409
 410         /* Beginning of a frame. */
 411         if (chunk_no == 0) {
 412                 usbtv->frame_id = frame_id;
 413                 usbtv->chunks_done = 0;
 414         }
 415
 416         if (usbtv->frame_id != frame_id)
 417                 return;
 418
 419         spin_lock_irqsave(&usbtv->buflock, flags);
 420         if (list_empty(&usbtv->bufs)) {
 421                 /* No free buffers. Userspace likely too slow. */
 422                 spin_unlock_irqrestore(&usbtv->buflock, flags);
 423                 return;
 424         }
 425
 426         /* First available buffer. */
 427         buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
 428         frame = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 429
 430         /* Copy the chunk data. */
 431         usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
 432         usbtv->chunks_done++;
 433
 434         /* Last chunk in a field */
 435         if (chunk_no == usbtv->n_chunks-1) {
 436                 /* Last chunk in a frame, signalling an end */
 437                 if (odd && !usbtv->last_odd) {
 438                         int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 439                         enum vb2_buffer_state state = usbtv->chunks_done ==
 440                                 usbtv->n_chunks ?
 441                                 VB2_BUF_STATE_DONE :
 442                                 VB2_BUF_STATE_ERROR;
 443
 444                         buf->vb.field = V4L2_FIELD_INTERLACED;
 445                         buf->vb.sequence = usbtv->sequence++;
 446                         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 447                         vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
 448                         vb2_buffer_done(&buf->vb.vb2_buf, state);
 449                         list_del(&buf->list);
 450                 }
 451                 usbtv->last_odd = odd;
 452         }
 453
 454         spin_unlock_irqrestore(&usbtv->buflock, flags);
 455 }
 456
 457 /* Got image data. Each packet contains a number of 256-word chunks we
 458  * compose the image from. */
 459 static void usbtv_iso_cb(struct urb *ip)
 460 {
 461         int ret;
 462         int i;
 463         struct usbtv *usbtv = (struct usbtv *)ip->context;
 464
 465         switch (ip->status) {
 466         /* All fine. */
 467         case 0:
 468                 break;
 469         /* Device disconnected or capture stopped? */
 470         case -ENODEV:
 471         case -ENOENT:
 472         case -ECONNRESET:
 473         case -ESHUTDOWN:
 474                 return;
 475         /* Unknown error. Retry. */
 476         default:
 477                 dev_warn(usbtv->dev, "Bad response for ISO request.\n");
 478                 goto resubmit;
 479         }
 480
 481         for (i = 0; i < ip->number_of_packets; i++) {
 482                 int size = ip->iso_frame_desc[i].actual_length;
 483                 unsigned char *data = ip->transfer_buffer +
 484                                 ip->iso_frame_desc[i].offset;
 485                 int offset;
 486
 487                 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
 488                         usbtv_image_chunk(usbtv,
 489                                 (__be32 *)&data[USBTV_CHUNK_SIZE * offset]);
 490         }
 491
 492 resubmit:
 493         ret = usb_submit_urb(ip, GFP_ATOMIC);
 494         if (ret < 0)
 495                 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
 496 }
 497
 498 static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
 499 {
 500         struct urb *ip;
 501         int size = usbtv->iso_size;
 502         int i;
 503
 504         ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
 505         if (ip == NULL)
 506                 return NULL;
 507
 508         ip->dev = usbtv->udev;
 509         ip->context = usbtv;
 510         ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
 511         ip->interval = 1;
 512         ip->transfer_flags = URB_ISO_ASAP;
 513         ip->transfer_buffer = kcalloc(USBTV_ISOC_PACKETS, size,
 514                                                 GFP_KERNEL);
 515         if (!ip->transfer_buffer) {
 516                 usb_free_urb(ip);
 517                 return NULL;
 518         }
 519         ip->complete = usbtv_iso_cb;
 520         ip->number_of_packets = USBTV_ISOC_PACKETS;
 521         ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
 522         for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
 523                 ip->iso_frame_desc[i].offset = size * i;
 524                 ip->iso_frame_desc[i].length = size;
 525         }
 526
 527         return ip;
 528 }
 529
 530 static void usbtv_stop(struct usbtv *usbtv)
 531 {
 532         int i;
 533         unsigned long flags;
 534
 535         /* Cancel running transfers. */
 536         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 537                 struct urb *ip = usbtv->isoc_urbs[i];
 538
 539                 if (ip == NULL)
 540                         continue;
 541                 usb_kill_urb(ip);
 542                 kfree(ip->transfer_buffer);
 543                 usb_free_urb(ip);
 544                 usbtv->isoc_urbs[i] = NULL;
 545         }
 546
 547         /* Return buffers to userspace. */
 548         spin_lock_irqsave(&usbtv->buflock, flags);
 549         while (!list_empty(&usbtv->bufs)) {
 550                 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
 551                                                 struct usbtv_buf, list);
 552                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 553                 list_del(&buf->list);
 554         }
 555         spin_unlock_irqrestore(&usbtv->buflock, flags);
 556 }
 557
 558 static int usbtv_start(struct usbtv *usbtv)
 559 {
 560         int i;
 561         int ret;
 562
 563         usbtv_audio_suspend(usbtv);
 564
 565         ret = usb_set_interface(usbtv->udev, 0, 0);
 566         if (ret < 0)
 567                 return ret;
 568
 569         ret = usbtv_setup_capture(usbtv);
 570         if (ret < 0)
 571                 return ret;
 572
 573         ret = usb_set_interface(usbtv->udev, 0, 1);
 574         if (ret < 0)
 575                 return ret;
 576
 577         usbtv_audio_resume(usbtv);
 578
 579         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 580                 struct urb *ip;
 581
 582                 ip = usbtv_setup_iso_transfer(usbtv);
 583                 if (ip == NULL) {
 584                         ret = -ENOMEM;
 585                         goto start_fail;
 586                 }
 587                 usbtv->isoc_urbs[i] = ip;
 588
 589                 ret = usb_submit_urb(ip, GFP_KERNEL);
 590                 if (ret < 0)
 591                         goto start_fail;
 592         }
 593
 594         return 0;
 595
 596 start_fail:
 597         usbtv_stop(usbtv);
 598         return ret;
 599 }
 600
 601 static int usbtv_querycap(struct file *file, void *priv,
 602                                 struct v4l2_capability *cap)
 603 {
 604         struct usbtv *dev = video_drvdata(file);
 605
 606         strscpy(cap->driver, "usbtv", sizeof(cap->driver));
 607         strscpy(cap->card, "usbtv", sizeof(cap->card));
 608         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 609         return 0;
 610 }
 611
 612 static int usbtv_enum_input(struct file *file, void *priv,
 613                                         struct v4l2_input *i)
 614 {
 615         struct usbtv *dev = video_drvdata(file);
 616
 617         switch (i->index) {
 618         case USBTV_COMPOSITE_INPUT:
 619                 strscpy(i->name, "Composite", sizeof(i->name));
 620                 break;
 621         case USBTV_SVIDEO_INPUT:
 622                 strscpy(i->name, "S-Video", sizeof(i->name));
 623                 break;
 624         default:
 625                 return -EINVAL;
 626         }
 627
 628         i->type = V4L2_INPUT_TYPE_CAMERA;
 629         i->std = dev->vdev.tvnorms;
 630         return 0;
 631 }
 632
 633 static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
 634                                         struct v4l2_fmtdesc *f)
 635 {
 636         if (f->index > 0)
 637                 return -EINVAL;
 638
 639         f->pixelformat = V4L2_PIX_FMT_YUYV;
 640         return 0;
 641 }
 642
 643 static int usbtv_fmt_vid_cap(struct file *file, void *priv,
 644                                         struct v4l2_format *f)
 645 {
 646         struct usbtv *usbtv = video_drvdata(file);
 647
 648         f->fmt.pix.width = usbtv->width;
 649         f->fmt.pix.height = usbtv->height;
 650         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 651         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 652         f->fmt.pix.bytesperline = usbtv->width * 2;
 653         f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
 654         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 655
 656         return 0;
 657 }
 658
 659 static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 660 {
 661         struct usbtv *usbtv = video_drvdata(file);
 662         *norm = usbtv->norm;
 663         return 0;
 664 }
 665
 666 static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
 667 {
 668         int ret = -EINVAL;
 669         struct usbtv *usbtv = video_drvdata(file);
 670
 671         if (norm & USBTV_TV_STD)
 672                 ret = usbtv_select_norm(usbtv, norm);
 673
 674         return ret;
 675 }
 676
 677 static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
 678 {
 679         struct usbtv *usbtv = video_drvdata(file);
 680         *i = usbtv->input;
 681         return 0;
 682 }
 683
 684 static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
 685 {
 686         struct usbtv *usbtv = video_drvdata(file);
 687
 688         return usbtv_select_input(usbtv, i);
 689 }
 690
 691 static const struct v4l2_ioctl_ops usbtv_ioctl_ops = {
 692         .vidioc_querycap = usbtv_querycap,
 693         .vidioc_enum_input = usbtv_enum_input,
 694         .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
 695         .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
 696         .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
 697         .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
 698         .vidioc_g_std = usbtv_g_std,
 699         .vidioc_s_std = usbtv_s_std,
 700         .vidioc_g_input = usbtv_g_input,
 701         .vidioc_s_input = usbtv_s_input,
 702
 703         .vidioc_reqbufs = vb2_ioctl_reqbufs,
 704         .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
 705         .vidioc_querybuf = vb2_ioctl_querybuf,
 706         .vidioc_create_bufs = vb2_ioctl_create_bufs,
 707         .vidioc_qbuf = vb2_ioctl_qbuf,
 708         .vidioc_dqbuf = vb2_ioctl_dqbuf,
 709         .vidioc_streamon = vb2_ioctl_streamon,
 710         .vidioc_streamoff = vb2_ioctl_streamoff,
 711 };
 712
 713 static const struct v4l2_file_operations usbtv_fops = {
 714         .owner = THIS_MODULE,
 715         .unlocked_ioctl = video_ioctl2,
 716         .mmap = vb2_fop_mmap,
 717         .open = v4l2_fh_open,
 718         .release = vb2_fop_release,
 719         .read = vb2_fop_read,
 720         .poll = vb2_fop_poll,
 721 };
 722
 723 static int usbtv_queue_setup(struct vb2_queue *vq,
 724         unsigned int *nbuffers,
 725         unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
 726 {
 727         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 728         unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
 729         unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 730
 731         if (q_num_bufs + *nbuffers < 2)
 732                 *nbuffers = 2 - q_num_bufs;
 733         if (*nplanes)
 734                 return sizes[0] < size ? -EINVAL : 0;
 735         *nplanes = 1;
 736         sizes[0] = size;
 737
 738         return 0;
 739 }
 740
 741 static void usbtv_buf_queue(struct vb2_buffer *vb)
 742 {
 743         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 744         struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
 745         struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb);
 746         unsigned long flags;
 747
 748         if (usbtv->udev == NULL) {
 749                 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 750                 return;
 751         }
 752
 753         spin_lock_irqsave(&usbtv->buflock, flags);
 754         list_add_tail(&buf->list, &usbtv->bufs);
 755         spin_unlock_irqrestore(&usbtv->buflock, flags);
 756 }
 757
 758 static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
 759 {
 760         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 761
 762         if (usbtv->udev == NULL)
 763                 return -ENODEV;
 764
 765         usbtv->last_odd = 1;
 766         usbtv->sequence = 0;
 767         return usbtv_start(usbtv);
 768 }
 769
 770 static void usbtv_stop_streaming(struct vb2_queue *vq)
 771 {
 772         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 773
 774         if (usbtv->udev)
 775                 usbtv_stop(usbtv);
 776 }
 777
 778 static const struct vb2_ops usbtv_vb2_ops = {
 779         .queue_setup = usbtv_queue_setup,
 780         .buf_queue = usbtv_buf_queue,
 781         .start_streaming = usbtv_start_streaming,
 782         .stop_streaming = usbtv_stop_streaming,
 783 };
 784
 785 static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl)
 786 {
 787         struct usbtv *usbtv = container_of(ctrl->handler, struct usbtv,
 788                                                                 ctrl);
 789         u8 *data;
 790         u16 index, size;
 791         int ret;
 792
 793         data = kmalloc(3, GFP_KERNEL);
 794         if (!data)
 795                 return -ENOMEM;
 796
 797         /*
 798          * Read in the current brightness/contrast registers. We need them
 799          * both, because the values are for some reason interleaved.
 800          */
 801         if (ctrl->id == V4L2_CID_BRIGHTNESS || ctrl->id == V4L2_CID_CONTRAST) {
 802                 ret = usb_control_msg(usbtv->udev,
 803                         usb_rcvctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG,
 804                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 805                         0, USBTV_BASE + 0x0244, (void *)data, 3,
 806                         USB_CTRL_GET_TIMEOUT);
 807                 if (ret < 0)
 808                         goto error;
 809         }
 810
 811         switch (ctrl->id) {
 812         case V4L2_CID_BRIGHTNESS:
 813                 index = USBTV_BASE + 0x0244;
 814                 size = 3;
 815                 data[0] &= 0xf0;
 816                 data[0] |= (ctrl->val >> 8) & 0xf;
 817                 data[2] = ctrl->val & 0xff;
 818                 break;
 819         case V4L2_CID_CONTRAST:
 820                 index = USBTV_BASE + 0x0244;
 821                 size = 3;
 822                 data[0] &= 0x0f;
 823                 data[0] |= (ctrl->val >> 4) & 0xf0;
 824                 data[1] = ctrl->val & 0xff;
 825                 break;
 826         case V4L2_CID_SATURATION:
 827                 index = USBTV_BASE + 0x0242;
 828                 data[0] = ctrl->val >> 8;
 829                 data[1] = ctrl->val & 0xff;
 830                 size = 2;
 831                 break;
 832         case V4L2_CID_HUE:
 833                 index = USBTV_BASE + 0x0240;
 834                 size = 2;
 835                 if (ctrl->val > 0) {
 836                         data[0] = 0x92 + (ctrl->val >> 8);
 837                         data[1] = ctrl->val & 0xff;
 838                 } else {
 839                         data[0] = 0x82 + (-ctrl->val >> 8);
 840                         data[1] = -ctrl->val & 0xff;
 841                 }
 842                 break;
 843         case V4L2_CID_SHARPNESS:
 844                 index = USBTV_BASE + 0x0239;
 845                 data[0] = 0;
 846                 data[1] = ctrl->val;
 847                 size = 2;
 848                 break;
 849         default:
 850                 kfree(data);
 851                 return -EINVAL;
 852         }
 853
 854         ret = usb_control_msg(usbtv->udev, usb_sndctrlpipe(usbtv->udev, 0),
 855                         USBTV_CONTROL_REG,
 856                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 857                         0, index, (void *)data, size, USB_CTRL_SET_TIMEOUT);
 858
 859 error:
 860         if (ret < 0)
 861                 dev_warn(usbtv->dev, "Failed to submit a control request.\n");
 862
 863         kfree(data);
 864         return ret;
 865 }
 866
 867 static const struct v4l2_ctrl_ops usbtv_ctrl_ops = {
 868         .s_ctrl = usbtv_s_ctrl,
 869 };
 870
 871 static void usbtv_release(struct v4l2_device *v4l2_dev)
 872 {
 873         struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
 874
 875         v4l2_device_unregister(&usbtv->v4l2_dev);
 876         v4l2_ctrl_handler_free(&usbtv->ctrl);
 877         kfree(usbtv);
 878 }
 879
 880 int usbtv_video_init(struct usbtv *usbtv)
 881 {
 882         int ret;
 883
 884         (void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);
 885
 886         spin_lock_init(&usbtv->buflock);
 887         mutex_init(&usbtv->v4l2_lock);
 888         mutex_init(&usbtv->vb2q_lock);
 889         INIT_LIST_HEAD(&usbtv->bufs);
 890
 891         /* videobuf2 structure */
 892         usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 893         usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
 894         usbtv->vb2q.drv_priv = usbtv;
 895         usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
 896         usbtv->vb2q.ops = &usbtv_vb2_ops;
 897         usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
 898         usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 899         usbtv->vb2q.lock = &usbtv->vb2q_lock;
 900         ret = vb2_queue_init(&usbtv->vb2q);
 901         if (ret < 0) {
 902                 dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
 903                 return ret;
 904         }
 905
 906         /* controls */
 907         v4l2_ctrl_handler_init(&usbtv->ctrl, 4);
 908         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 909                         V4L2_CID_CONTRAST, 0, 0x3ff, 1, 0x1d0);
 910         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 911                         V4L2_CID_BRIGHTNESS, 0, 0x3ff, 1, 0x1c0);
 912         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 913                         V4L2_CID_SATURATION, 0, 0x3ff, 1, 0x200);
 914         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 915                         V4L2_CID_HUE, -0xdff, 0xdff, 1, 0x000);
 916         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 917                         V4L2_CID_SHARPNESS, 0x0, 0xff, 1, 0x60);
 918         ret = usbtv->ctrl.error;
 919         if (ret < 0) {
 920                 dev_warn(usbtv->dev, "Could not initialize controls\n");
 921                 goto ctrl_fail;
 922         }
 923
 924         /* v4l2 structure */
 925         usbtv->v4l2_dev.ctrl_handler = &usbtv->ctrl;
 926         usbtv->v4l2_dev.release = usbtv_release;
 927         ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
 928         if (ret < 0) {
 929                 dev_warn(usbtv->dev, "Could not register v4l2 device\n");
 930                 goto v4l2_fail;
 931         }
 932
 933         /* Video structure */
 934         strscpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
 935         usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
 936         usbtv->vdev.release = video_device_release_empty;
 937         usbtv->vdev.fops = &usbtv_fops;
 938         usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
 939         usbtv->vdev.tvnorms = USBTV_TV_STD;
 940         usbtv->vdev.queue = &usbtv->vb2q;
 941         usbtv->vdev.lock = &usbtv->v4l2_lock;
 942         usbtv->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
 943                                   V4L2_CAP_STREAMING;
 944         video_set_drvdata(&usbtv->vdev, usbtv);
 945         ret = video_register_device(&usbtv->vdev, VFL_TYPE_VIDEO, -1);
 946         if (ret < 0) {
 947                 dev_warn(usbtv->dev, "Could not register video device\n");
 948                 goto vdev_fail;
 949         }
 950
 951         return 0;
 952
 953 vdev_fail:
 954         v4l2_device_unregister(&usbtv->v4l2_dev);
 955 v4l2_fail:
 956 ctrl_fail:
 957         v4l2_ctrl_handler_free(&usbtv->ctrl);
 958
 959         return ret;
 960 }
 961
 962 void usbtv_video_free(struct usbtv *usbtv)
 963 {
 964         vb2_video_unregister_device(&usbtv->vdev);
 965         v4l2_device_disconnect(&usbtv->v4l2_dev);
 966
 967         v4l2_device_put(&usbtv->v4l2_dev);
 968 }