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 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         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         /* Fallback to automatic detection for other standards */
 140         return 0x0000;
 141 }
 142
 143 static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
 144 {
 145         int ret;
 146         /* These are the series of register values used to configure the
 147          * decoder for a specific standard.
 148          * The first 21 register writes are copied from the
 149          * Settings\DecoderDefaults registry keys present in the Windows driver
 150          * .INF file, and control various image tuning parameters (color
 151          * correction, sharpness, ...).
 152          */
 153         static const u16 pal[][2] = {
 154                 /* "AVPAL" tuning sequence from .INF file */
 155                 { USBTV_BASE + 0x0003, 0x0004 },
 156                 { USBTV_BASE + 0x001a, 0x0068 },
 157                 { USBTV_BASE + 0x0100, 0x00d3 },
 158                 { USBTV_BASE + 0x010e, 0x0072 },
 159                 { USBTV_BASE + 0x010f, 0x00a2 },
 160                 { USBTV_BASE + 0x0112, 0x00b0 },
 161                 { USBTV_BASE + 0x0115, 0x0015 },
 162                 { USBTV_BASE + 0x0117, 0x0001 },
 163                 { USBTV_BASE + 0x0118, 0x002c },
 164                 { USBTV_BASE + 0x012d, 0x0010 },
 165                 { USBTV_BASE + 0x012f, 0x0020 },
 166                 { USBTV_BASE + 0x0220, 0x002e },
 167                 { USBTV_BASE + 0x0225, 0x0008 },
 168                 { USBTV_BASE + 0x024e, 0x0002 },
 169                 { USBTV_BASE + 0x024f, 0x0002 },
 170                 { USBTV_BASE + 0x0254, 0x0059 },
 171                 { USBTV_BASE + 0x025a, 0x0016 },
 172                 { USBTV_BASE + 0x025b, 0x0035 },
 173                 { USBTV_BASE + 0x0263, 0x0017 },
 174                 { USBTV_BASE + 0x0266, 0x0016 },
 175                 { USBTV_BASE + 0x0267, 0x0036 },
 176                 /* End image tuning */
 177                 { USBTV_BASE + 0x024e, 0x0002 },
 178                 { USBTV_BASE + 0x024f, 0x0002 },
 179         };
 180
 181         static const u16 ntsc[][2] = {
 182                 /* "AVNTSC" tuning sequence from .INF file */
 183                 { USBTV_BASE + 0x0003, 0x0004 },
 184                 { USBTV_BASE + 0x001a, 0x0079 },
 185                 { USBTV_BASE + 0x0100, 0x00d3 },
 186                 { USBTV_BASE + 0x010e, 0x0068 },
 187                 { USBTV_BASE + 0x010f, 0x009c },
 188                 { USBTV_BASE + 0x0112, 0x00f0 },
 189                 { USBTV_BASE + 0x0115, 0x0015 },
 190                 { USBTV_BASE + 0x0117, 0x0000 },
 191                 { USBTV_BASE + 0x0118, 0x00fc },
 192                 { USBTV_BASE + 0x012d, 0x0004 },
 193                 { USBTV_BASE + 0x012f, 0x0008 },
 194                 { USBTV_BASE + 0x0220, 0x002e },
 195                 { USBTV_BASE + 0x0225, 0x0008 },
 196                 { USBTV_BASE + 0x024e, 0x0002 },
 197                 { USBTV_BASE + 0x024f, 0x0001 },
 198                 { USBTV_BASE + 0x0254, 0x005f },
 199                 { USBTV_BASE + 0x025a, 0x0012 },
 200                 { USBTV_BASE + 0x025b, 0x0001 },
 201                 { USBTV_BASE + 0x0263, 0x001c },
 202                 { USBTV_BASE + 0x0266, 0x0011 },
 203                 { USBTV_BASE + 0x0267, 0x0005 },
 204                 /* End image tuning */
 205                 { USBTV_BASE + 0x024e, 0x0002 },
 206                 { USBTV_BASE + 0x024f, 0x0002 },
 207         };
 208
 209         static const u16 secam[][2] = {
 210                 /* "AVSECAM" tuning sequence from .INF file */
 211                 { USBTV_BASE + 0x0003, 0x0004 },
 212                 { USBTV_BASE + 0x001a, 0x0073 },
 213                 { USBTV_BASE + 0x0100, 0x00dc },
 214                 { USBTV_BASE + 0x010e, 0x0072 },
 215                 { USBTV_BASE + 0x010f, 0x00a2 },
 216                 { USBTV_BASE + 0x0112, 0x0090 },
 217                 { USBTV_BASE + 0x0115, 0x0035 },
 218                 { USBTV_BASE + 0x0117, 0x0001 },
 219                 { USBTV_BASE + 0x0118, 0x0030 },
 220                 { USBTV_BASE + 0x012d, 0x0004 },
 221                 { USBTV_BASE + 0x012f, 0x0008 },
 222                 { USBTV_BASE + 0x0220, 0x002d },
 223                 { USBTV_BASE + 0x0225, 0x0028 },
 224                 { USBTV_BASE + 0x024e, 0x0008 },
 225                 { USBTV_BASE + 0x024f, 0x0002 },
 226                 { USBTV_BASE + 0x0254, 0x0069 },
 227                 { USBTV_BASE + 0x025a, 0x0016 },
 228                 { USBTV_BASE + 0x025b, 0x0035 },
 229                 { USBTV_BASE + 0x0263, 0x0021 },
 230                 { USBTV_BASE + 0x0266, 0x0016 },
 231                 { USBTV_BASE + 0x0267, 0x0036 },
 232                 /* End image tuning */
 233                 { USBTV_BASE + 0x024e, 0x0002 },
 234                 { USBTV_BASE + 0x024f, 0x0002 },
 235         };
 236
 237         ret = usbtv_configure_for_norm(usbtv, norm);
 238
 239         if (!ret) {
 240                 /* Masks for norms using a NTSC or PAL color encoding. */
 241                 static const v4l2_std_id ntsc_mask =
 242                         V4L2_STD_NTSC | V4L2_STD_NTSC_443;
 243                 static const v4l2_std_id pal_mask =
 244                         V4L2_STD_PAL | V4L2_STD_PAL_60 | V4L2_STD_PAL_M;
 245
 246                 if (norm & ntsc_mask)
 247                         ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
 248                 else if (norm & pal_mask)
 249                         ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
 250                 else if (norm & V4L2_STD_SECAM)
 251                         ret = usbtv_set_regs(usbtv, secam, ARRAY_SIZE(secam));
 252                 else
 253                         ret = -EINVAL;
 254         }
 255
 256         if (!ret) {
 257                 /* Configure the decoder for the color standard */
 258                 const u16 cfg[][2] = {
 259                         { USBTV_BASE + 0x016f, usbtv_norm_to_16f_reg(norm) }
 260                 };
 261                 ret = usbtv_set_regs(usbtv, cfg, ARRAY_SIZE(cfg));
 262         }
 263
 264         return ret;
 265 }
 266
 267 static int usbtv_setup_capture(struct usbtv *usbtv)
 268 {
 269         int ret;
 270         static const u16 setup[][2] = {
 271                 /* These seem to enable the device. */
 272                 { USBTV_BASE + 0x0008, 0x0001 },
 273                 { USBTV_BASE + 0x01d0, 0x00ff },
 274                 { USBTV_BASE + 0x01d9, 0x0002 },
 275
 276                 /* These seem to influence color parameters, such as
 277                  * brightness, etc. */
 278                 { USBTV_BASE + 0x0239, 0x0040 },
 279                 { USBTV_BASE + 0x0240, 0x0000 },
 280                 { USBTV_BASE + 0x0241, 0x0000 },
 281                 { USBTV_BASE + 0x0242, 0x0002 },
 282                 { USBTV_BASE + 0x0243, 0x0080 },
 283                 { USBTV_BASE + 0x0244, 0x0012 },
 284                 { USBTV_BASE + 0x0245, 0x0090 },
 285                 { USBTV_BASE + 0x0246, 0x0000 },
 286
 287                 { USBTV_BASE + 0x0278, 0x002d },
 288                 { USBTV_BASE + 0x0279, 0x000a },
 289                 { USBTV_BASE + 0x027a, 0x0032 },
 290                 { 0xf890, 0x000c },
 291                 { 0xf894, 0x0086 },
 292
 293                 { USBTV_BASE + 0x00ac, 0x00c0 },
 294                 { USBTV_BASE + 0x00ad, 0x0000 },
 295                 { USBTV_BASE + 0x00a2, 0x0012 },
 296                 { USBTV_BASE + 0x00a3, 0x00e0 },
 297                 { USBTV_BASE + 0x00a4, 0x0028 },
 298                 { USBTV_BASE + 0x00a5, 0x0082 },
 299                 { USBTV_BASE + 0x00a7, 0x0080 },
 300                 { USBTV_BASE + 0x0000, 0x0014 },
 301                 { USBTV_BASE + 0x0006, 0x0003 },
 302                 { USBTV_BASE + 0x0090, 0x0099 },
 303                 { USBTV_BASE + 0x0091, 0x0090 },
 304                 { USBTV_BASE + 0x0094, 0x0068 },
 305                 { USBTV_BASE + 0x0095, 0x0070 },
 306                 { USBTV_BASE + 0x009c, 0x0030 },
 307                 { USBTV_BASE + 0x009d, 0x00c0 },
 308                 { USBTV_BASE + 0x009e, 0x00e0 },
 309                 { USBTV_BASE + 0x0019, 0x0006 },
 310                 { USBTV_BASE + 0x008c, 0x00ba },
 311                 { USBTV_BASE + 0x0101, 0x00ff },
 312                 { USBTV_BASE + 0x010c, 0x00b3 },
 313                 { USBTV_BASE + 0x01b2, 0x0080 },
 314                 { USBTV_BASE + 0x01b4, 0x00a0 },
 315                 { USBTV_BASE + 0x014c, 0x00ff },
 316                 { USBTV_BASE + 0x014d, 0x00ca },
 317                 { USBTV_BASE + 0x0113, 0x0053 },
 318                 { USBTV_BASE + 0x0119, 0x008a },
 319                 { USBTV_BASE + 0x013c, 0x0003 },
 320                 { USBTV_BASE + 0x0150, 0x009c },
 321                 { USBTV_BASE + 0x0151, 0x0071 },
 322                 { USBTV_BASE + 0x0152, 0x00c6 },
 323                 { USBTV_BASE + 0x0153, 0x0084 },
 324                 { USBTV_BASE + 0x0154, 0x00bc },
 325                 { USBTV_BASE + 0x0155, 0x00a0 },
 326                 { USBTV_BASE + 0x0156, 0x00a0 },
 327                 { USBTV_BASE + 0x0157, 0x009c },
 328                 { USBTV_BASE + 0x0158, 0x001f },
 329                 { USBTV_BASE + 0x0159, 0x0006 },
 330                 { USBTV_BASE + 0x015d, 0x0000 },
 331         };
 332
 333         ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
 334         if (ret)
 335                 return ret;
 336
 337         ret = usbtv_select_norm(usbtv, usbtv->norm);
 338         if (ret)
 339                 return ret;
 340
 341         ret = usbtv_select_input(usbtv, usbtv->input);
 342         if (ret)
 343                 return ret;
 344
 345         ret = v4l2_ctrl_handler_setup(&usbtv->ctrl);
 346         if (ret)
 347                 return ret;
 348
 349         return 0;
 350 }
 351
 352 /* Copy data from chunk into a frame buffer, deinterlacing the data
 353  * into every second line. Unfortunately, they don't align nicely into
 354  * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
 355  * Therefore, we break down the chunk into two halves before copying,
 356  * so that we can interleave a line if needed.
 357  *
 358  * Each "chunk" is 240 words; a word in this context equals 4 bytes.
 359  * Image format is YUYV/YUV 4:2:2, consisting of Y Cr Y Cb, defining two
 360  * pixels, the Cr and Cb shared between the two pixels, but each having
 361  * separate Y values. Thus, the 240 words equal 480 pixels. It therefore,
 362  * takes 1.5 chunks to make a 720 pixel-wide line for the frame.
 363  * The image is interlaced, so there is a "scan" of odd lines, followed
 364  * by "scan" of even numbered lines.
 365  *
 366  * Following code is writing the chunks in correct sequence, skipping
 367  * the rows based on "odd" value.
 368  * line 1: chunk[0][  0..479] chunk[0][480..959] chunk[1][  0..479]
 369  * line 3: chunk[1][480..959] chunk[2][  0..479] chunk[2][480..959]
 370  * ...etc.
 371  */
 372 static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd)
 373 {
 374         int half;
 375
 376         for (half = 0; half < 2; half++) {
 377                 int part_no = chunk_no * 2 + half;
 378                 int line = part_no / 3;
 379                 int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
 380
 381                 u32 *dst = &frame[part_index * USBTV_CHUNK/2];
 382
 383                 memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
 384                 src += USBTV_CHUNK/2;
 385         }
 386 }
 387
 388 /* Called for each 256-byte image chunk.
 389  * First word identifies the chunk, followed by 240 words of image
 390  * data and padding. */
 391 static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
 392 {
 393         int frame_id, odd, chunk_no;
 394         u32 *frame;
 395         struct usbtv_buf *buf;
 396         unsigned long flags;
 397
 398         /* Ignore corrupted lines. */
 399         if (!USBTV_MAGIC_OK(chunk))
 400                 return;
 401         frame_id = USBTV_FRAME_ID(chunk);
 402         odd = USBTV_ODD(chunk);
 403         chunk_no = USBTV_CHUNK_NO(chunk);
 404         if (chunk_no >= usbtv->n_chunks)
 405                 return;
 406
 407         /* Beginning of a frame. */
 408         if (chunk_no == 0) {
 409                 usbtv->frame_id = frame_id;
 410                 usbtv->chunks_done = 0;
 411         }
 412
 413         if (usbtv->frame_id != frame_id)
 414                 return;
 415
 416         spin_lock_irqsave(&usbtv->buflock, flags);
 417         if (list_empty(&usbtv->bufs)) {
 418                 /* No free buffers. Userspace likely too slow. */
 419                 spin_unlock_irqrestore(&usbtv->buflock, flags);
 420                 return;
 421         }
 422
 423         /* First available buffer. */
 424         buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
 425         frame = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 426
 427         /* Copy the chunk data. */
 428         usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
 429         usbtv->chunks_done++;
 430
 431         /* Last chunk in a field */
 432         if (chunk_no == usbtv->n_chunks-1) {
 433                 /* Last chunk in a frame, signalling an end */
 434                 if (odd && !usbtv->last_odd) {
 435                         int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 436                         enum vb2_buffer_state state = usbtv->chunks_done ==
 437                                 usbtv->n_chunks ?
 438                                 VB2_BUF_STATE_DONE :
 439                                 VB2_BUF_STATE_ERROR;
 440
 441                         buf->vb.field = V4L2_FIELD_INTERLACED;
 442                         buf->vb.sequence = usbtv->sequence++;
 443                         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 444                         vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
 445                         vb2_buffer_done(&buf->vb.vb2_buf, state);
 446                         list_del(&buf->list);
 447                 }
 448                 usbtv->last_odd = odd;
 449         }
 450
 451         spin_unlock_irqrestore(&usbtv->buflock, flags);
 452 }
 453
 454 /* Got image data. Each packet contains a number of 256-word chunks we
 455  * compose the image from. */
 456 static void usbtv_iso_cb(struct urb *ip)
 457 {
 458         int ret;
 459         int i;
 460         struct usbtv *usbtv = (struct usbtv *)ip->context;
 461
 462         switch (ip->status) {
 463         /* All fine. */
 464         case 0:
 465                 break;
 466         /* Device disconnected or capture stopped? */
 467         case -ENODEV:
 468         case -ENOENT:
 469         case -ECONNRESET:
 470         case -ESHUTDOWN:
 471                 return;
 472         /* Unknown error. Retry. */
 473         default:
 474                 dev_warn(usbtv->dev, "Bad response for ISO request.\n");
 475                 goto resubmit;
 476         }
 477
 478         for (i = 0; i < ip->number_of_packets; i++) {
 479                 int size = ip->iso_frame_desc[i].actual_length;
 480                 unsigned char *data = ip->transfer_buffer +
 481                                 ip->iso_frame_desc[i].offset;
 482                 int offset;
 483
 484                 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
 485                         usbtv_image_chunk(usbtv,
 486                                 (__be32 *)&data[USBTV_CHUNK_SIZE * offset]);
 487         }
 488
 489 resubmit:
 490         ret = usb_submit_urb(ip, GFP_ATOMIC);
 491         if (ret < 0)
 492                 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
 493 }
 494
 495 static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
 496 {
 497         struct urb *ip;
 498         int size = usbtv->iso_size;
 499         int i;
 500
 501         ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
 502         if (ip == NULL)
 503                 return NULL;
 504
 505         ip->dev = usbtv->udev;
 506         ip->context = usbtv;
 507         ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
 508         ip->interval = 1;
 509         ip->transfer_flags = URB_ISO_ASAP;
 510         ip->transfer_buffer = kcalloc(USBTV_ISOC_PACKETS, size,
 511                                                 GFP_KERNEL);
 512         if (!ip->transfer_buffer) {
 513                 usb_free_urb(ip);
 514                 return NULL;
 515         }
 516         ip->complete = usbtv_iso_cb;
 517         ip->number_of_packets = USBTV_ISOC_PACKETS;
 518         ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
 519         for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
 520                 ip->iso_frame_desc[i].offset = size * i;
 521                 ip->iso_frame_desc[i].length = size;
 522         }
 523
 524         return ip;
 525 }
 526
 527 static void usbtv_stop(struct usbtv *usbtv)
 528 {
 529         int i;
 530         unsigned long flags;
 531
 532         /* Cancel running transfers. */
 533         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 534                 struct urb *ip = usbtv->isoc_urbs[i];
 535
 536                 if (ip == NULL)
 537                         continue;
 538                 usb_kill_urb(ip);
 539                 kfree(ip->transfer_buffer);
 540                 usb_free_urb(ip);
 541                 usbtv->isoc_urbs[i] = NULL;
 542         }
 543
 544         /* Return buffers to userspace. */
 545         spin_lock_irqsave(&usbtv->buflock, flags);
 546         while (!list_empty(&usbtv->bufs)) {
 547                 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
 548                                                 struct usbtv_buf, list);
 549                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 550                 list_del(&buf->list);
 551         }
 552         spin_unlock_irqrestore(&usbtv->buflock, flags);
 553 }
 554
 555 static int usbtv_start(struct usbtv *usbtv)
 556 {
 557         int i;
 558         int ret;
 559
 560         usbtv_audio_suspend(usbtv);
 561
 562         ret = usb_set_interface(usbtv->udev, 0, 0);
 563         if (ret < 0)
 564                 return ret;
 565
 566         ret = usbtv_setup_capture(usbtv);
 567         if (ret < 0)
 568                 return ret;
 569
 570         ret = usb_set_interface(usbtv->udev, 0, 1);
 571         if (ret < 0)
 572                 return ret;
 573
 574         usbtv_audio_resume(usbtv);
 575
 576         for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 577                 struct urb *ip;
 578
 579                 ip = usbtv_setup_iso_transfer(usbtv);
 580                 if (ip == NULL) {
 581                         ret = -ENOMEM;
 582                         goto start_fail;
 583                 }
 584                 usbtv->isoc_urbs[i] = ip;
 585
 586                 ret = usb_submit_urb(ip, GFP_KERNEL);
 587                 if (ret < 0)
 588                         goto start_fail;
 589         }
 590
 591         return 0;
 592
 593 start_fail:
 594         usbtv_stop(usbtv);
 595         return ret;
 596 }
 597
 598 static int usbtv_querycap(struct file *file, void *priv,
 599                                 struct v4l2_capability *cap)
 600 {
 601         struct usbtv *dev = video_drvdata(file);
 602
 603         strscpy(cap->driver, "usbtv", sizeof(cap->driver));
 604         strscpy(cap->card, "usbtv", sizeof(cap->card));
 605         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 606         return 0;
 607 }
 608
 609 static int usbtv_enum_input(struct file *file, void *priv,
 610                                         struct v4l2_input *i)
 611 {
 612         struct usbtv *dev = video_drvdata(file);
 613
 614         switch (i->index) {
 615         case USBTV_COMPOSITE_INPUT:
 616                 strscpy(i->name, "Composite", sizeof(i->name));
 617                 break;
 618         case USBTV_SVIDEO_INPUT:
 619                 strscpy(i->name, "S-Video", sizeof(i->name));
 620                 break;
 621         default:
 622                 return -EINVAL;
 623         }
 624
 625         i->type = V4L2_INPUT_TYPE_CAMERA;
 626         i->std = dev->vdev.tvnorms;
 627         return 0;
 628 }
 629
 630 static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
 631                                         struct v4l2_fmtdesc *f)
 632 {
 633         if (f->index > 0)
 634                 return -EINVAL;
 635
 636         f->pixelformat = V4L2_PIX_FMT_YUYV;
 637         return 0;
 638 }
 639
 640 static int usbtv_fmt_vid_cap(struct file *file, void *priv,
 641                                         struct v4l2_format *f)
 642 {
 643         struct usbtv *usbtv = video_drvdata(file);
 644
 645         f->fmt.pix.width = usbtv->width;
 646         f->fmt.pix.height = usbtv->height;
 647         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 648         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 649         f->fmt.pix.bytesperline = usbtv->width * 2;
 650         f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
 651         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 652
 653         return 0;
 654 }
 655
 656 static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 657 {
 658         struct usbtv *usbtv = video_drvdata(file);
 659         *norm = usbtv->norm;
 660         return 0;
 661 }
 662
 663 static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
 664 {
 665         int ret = -EINVAL;
 666         struct usbtv *usbtv = video_drvdata(file);
 667
 668         if (norm & USBTV_TV_STD)
 669                 ret = usbtv_select_norm(usbtv, norm);
 670
 671         return ret;
 672 }
 673
 674 static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
 675 {
 676         struct usbtv *usbtv = video_drvdata(file);
 677         *i = usbtv->input;
 678         return 0;
 679 }
 680
 681 static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
 682 {
 683         struct usbtv *usbtv = video_drvdata(file);
 684
 685         return usbtv_select_input(usbtv, i);
 686 }
 687
 688 static struct v4l2_ioctl_ops usbtv_ioctl_ops = {
 689         .vidioc_querycap = usbtv_querycap,
 690         .vidioc_enum_input = usbtv_enum_input,
 691         .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
 692         .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
 693         .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
 694         .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
 695         .vidioc_g_std = usbtv_g_std,
 696         .vidioc_s_std = usbtv_s_std,
 697         .vidioc_g_input = usbtv_g_input,
 698         .vidioc_s_input = usbtv_s_input,
 699
 700         .vidioc_reqbufs = vb2_ioctl_reqbufs,
 701         .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
 702         .vidioc_querybuf = vb2_ioctl_querybuf,
 703         .vidioc_create_bufs = vb2_ioctl_create_bufs,
 704         .vidioc_qbuf = vb2_ioctl_qbuf,
 705         .vidioc_dqbuf = vb2_ioctl_dqbuf,
 706         .vidioc_streamon = vb2_ioctl_streamon,
 707         .vidioc_streamoff = vb2_ioctl_streamoff,
 708 };
 709
 710 static const struct v4l2_file_operations usbtv_fops = {
 711         .owner = THIS_MODULE,
 712         .unlocked_ioctl = video_ioctl2,
 713         .mmap = vb2_fop_mmap,
 714         .open = v4l2_fh_open,
 715         .release = vb2_fop_release,
 716         .read = vb2_fop_read,
 717         .poll = vb2_fop_poll,
 718 };
 719
 720 static int usbtv_queue_setup(struct vb2_queue *vq,
 721         unsigned int *nbuffers,
 722         unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
 723 {
 724         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 725         unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
 726
 727         if (vq->num_buffers + *nbuffers < 2)
 728                 *nbuffers = 2 - vq->num_buffers;
 729         if (*nplanes)
 730                 return sizes[0] < size ? -EINVAL : 0;
 731         *nplanes = 1;
 732         sizes[0] = size;
 733
 734         return 0;
 735 }
 736
 737 static void usbtv_buf_queue(struct vb2_buffer *vb)
 738 {
 739         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 740         struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
 741         struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb);
 742         unsigned long flags;
 743
 744         if (usbtv->udev == NULL) {
 745                 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 746                 return;
 747         }
 748
 749         spin_lock_irqsave(&usbtv->buflock, flags);
 750         list_add_tail(&buf->list, &usbtv->bufs);
 751         spin_unlock_irqrestore(&usbtv->buflock, flags);
 752 }
 753
 754 static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
 755 {
 756         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 757
 758         if (usbtv->udev == NULL)
 759                 return -ENODEV;
 760
 761         usbtv->last_odd = 1;
 762         usbtv->sequence = 0;
 763         return usbtv_start(usbtv);
 764 }
 765
 766 static void usbtv_stop_streaming(struct vb2_queue *vq)
 767 {
 768         struct usbtv *usbtv = vb2_get_drv_priv(vq);
 769
 770         if (usbtv->udev)
 771                 usbtv_stop(usbtv);
 772 }
 773
 774 static const struct vb2_ops usbtv_vb2_ops = {
 775         .queue_setup = usbtv_queue_setup,
 776         .buf_queue = usbtv_buf_queue,
 777         .start_streaming = usbtv_start_streaming,
 778         .stop_streaming = usbtv_stop_streaming,
 779         .wait_prepare = vb2_ops_wait_prepare,
 780         .wait_finish = vb2_ops_wait_finish,
 781 };
 782
 783 static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl)
 784 {
 785         struct usbtv *usbtv = container_of(ctrl->handler, struct usbtv,
 786                                                                 ctrl);
 787         u8 *data;
 788         u16 index, size;
 789         int ret;
 790
 791         data = kmalloc(3, GFP_KERNEL);
 792         if (!data)
 793                 return -ENOMEM;
 794
 795         /*
 796          * Read in the current brightness/contrast registers. We need them
 797          * both, because the values are for some reason interleaved.
 798          */
 799         if (ctrl->id == V4L2_CID_BRIGHTNESS || ctrl->id == V4L2_CID_CONTRAST) {
 800                 ret = usb_control_msg(usbtv->udev,
 801                         usb_rcvctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG,
 802                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 803                         0, USBTV_BASE + 0x0244, (void *)data, 3, 0);
 804                 if (ret < 0)
 805                         goto error;
 806         }
 807
 808         switch (ctrl->id) {
 809         case V4L2_CID_BRIGHTNESS:
 810                 index = USBTV_BASE + 0x0244;
 811                 size = 3;
 812                 data[0] &= 0xf0;
 813                 data[0] |= (ctrl->val >> 8) & 0xf;
 814                 data[2] = ctrl->val & 0xff;
 815                 break;
 816         case V4L2_CID_CONTRAST:
 817                 index = USBTV_BASE + 0x0244;
 818                 size = 3;
 819                 data[0] &= 0x0f;
 820                 data[0] |= (ctrl->val >> 4) & 0xf0;
 821                 data[1] = ctrl->val & 0xff;
 822                 break;
 823         case V4L2_CID_SATURATION:
 824                 index = USBTV_BASE + 0x0242;
 825                 data[0] = ctrl->val >> 8;
 826                 data[1] = ctrl->val & 0xff;
 827                 size = 2;
 828                 break;
 829         case V4L2_CID_HUE:
 830                 index = USBTV_BASE + 0x0240;
 831                 size = 2;
 832                 if (ctrl->val > 0) {
 833                         data[0] = 0x92 + (ctrl->val >> 8);
 834                         data[1] = ctrl->val & 0xff;
 835                 } else {
 836                         data[0] = 0x82 + (-ctrl->val >> 8);
 837                         data[1] = -ctrl->val & 0xff;
 838                 }
 839                 break;
 840         case V4L2_CID_SHARPNESS:
 841                 index = USBTV_BASE + 0x0239;
 842                 data[0] = 0;
 843                 data[1] = ctrl->val;
 844                 size = 2;
 845                 break;
 846         default:
 847                 kfree(data);
 848                 return -EINVAL;
 849         }
 850
 851         ret = usb_control_msg(usbtv->udev, usb_sndctrlpipe(usbtv->udev, 0),
 852                         USBTV_CONTROL_REG,
 853                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 854                         0, index, (void *)data, size, 0);
 855
 856 error:
 857         if (ret < 0)
 858                 dev_warn(usbtv->dev, "Failed to submit a control request.\n");
 859
 860         kfree(data);
 861         return ret;
 862 }
 863
 864 static const struct v4l2_ctrl_ops usbtv_ctrl_ops = {
 865         .s_ctrl = usbtv_s_ctrl,
 866 };
 867
 868 static void usbtv_release(struct v4l2_device *v4l2_dev)
 869 {
 870         struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
 871
 872         v4l2_device_unregister(&usbtv->v4l2_dev);
 873         v4l2_ctrl_handler_free(&usbtv->ctrl);
 874         vb2_queue_release(&usbtv->vb2q);
 875         kfree(usbtv);
 876 }
 877
 878 int usbtv_video_init(struct usbtv *usbtv)
 879 {
 880         int ret;
 881
 882         (void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);
 883
 884         spin_lock_init(&usbtv->buflock);
 885         mutex_init(&usbtv->v4l2_lock);
 886         mutex_init(&usbtv->vb2q_lock);
 887         INIT_LIST_HEAD(&usbtv->bufs);
 888
 889         /* videobuf2 structure */
 890         usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 891         usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
 892         usbtv->vb2q.drv_priv = usbtv;
 893         usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
 894         usbtv->vb2q.ops = &usbtv_vb2_ops;
 895         usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
 896         usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 897         usbtv->vb2q.lock = &usbtv->vb2q_lock;
 898         ret = vb2_queue_init(&usbtv->vb2q);
 899         if (ret < 0) {
 900                 dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
 901                 return ret;
 902         }
 903
 904         /* controls */
 905         v4l2_ctrl_handler_init(&usbtv->ctrl, 4);
 906         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 907                         V4L2_CID_CONTRAST, 0, 0x3ff, 1, 0x1d0);
 908         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 909                         V4L2_CID_BRIGHTNESS, 0, 0x3ff, 1, 0x1c0);
 910         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 911                         V4L2_CID_SATURATION, 0, 0x3ff, 1, 0x200);
 912         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 913                         V4L2_CID_HUE, -0xdff, 0xdff, 1, 0x000);
 914         v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
 915                         V4L2_CID_SHARPNESS, 0x0, 0xff, 1, 0x60);
 916         ret = usbtv->ctrl.error;
 917         if (ret < 0) {
 918                 dev_warn(usbtv->dev, "Could not initialize controls\n");
 919                 goto ctrl_fail;
 920         }
 921
 922         /* v4l2 structure */
 923         usbtv->v4l2_dev.ctrl_handler = &usbtv->ctrl;
 924         usbtv->v4l2_dev.release = usbtv_release;
 925         ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
 926         if (ret < 0) {
 927                 dev_warn(usbtv->dev, "Could not register v4l2 device\n");
 928                 goto v4l2_fail;
 929         }
 930
 931         /* Video structure */
 932         strscpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
 933         usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
 934         usbtv->vdev.release = video_device_release_empty;
 935         usbtv->vdev.fops = &usbtv_fops;
 936         usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
 937         usbtv->vdev.tvnorms = USBTV_TV_STD;
 938         usbtv->vdev.queue = &usbtv->vb2q;
 939         usbtv->vdev.lock = &usbtv->v4l2_lock;
 940         usbtv->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
 941                                   V4L2_CAP_STREAMING;
 942         video_set_drvdata(&usbtv->vdev, usbtv);
 943         ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
 944         if (ret < 0) {
 945                 dev_warn(usbtv->dev, "Could not register video device\n");
 946                 goto vdev_fail;
 947         }
 948
 949         return 0;
 950
 951 vdev_fail:
 952         v4l2_device_unregister(&usbtv->v4l2_dev);
 953 v4l2_fail:
 954 ctrl_fail:
 955         v4l2_ctrl_handler_free(&usbtv->ctrl);
 956         vb2_queue_release(&usbtv->vb2q);
 957
 958         return ret;
 959 }
 960
 961 void usbtv_video_free(struct usbtv *usbtv)
 962 {
 963         mutex_lock(&usbtv->vb2q_lock);
 964         mutex_lock(&usbtv->v4l2_lock);
 965
 966         usbtv_stop(usbtv);
 967         video_unregister_device(&usbtv->vdev);
 968         v4l2_device_disconnect(&usbtv->v4l2_dev);
 969
 970         mutex_unlock(&usbtv->v4l2_lock);
 971         mutex_unlock(&usbtv->vb2q_lock);
 972
 973         v4l2_device_put(&usbtv->v4l2_dev);
 974 }