drivers/media/pci/ivtv/ivtv-fileops.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     file operation functions
   4     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   5     Copyright (C) 2004  Chris Kennedy <c@groovy.org>
   6     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
   7
   8  */
   9
  10 #include "ivtv-driver.h"
  11 #include "ivtv-fileops.h"
  12 #include "ivtv-i2c.h"
  13 #include "ivtv-queue.h"
  14 #include "ivtv-udma.h"
  15 #include "ivtv-irq.h"
  16 #include "ivtv-vbi.h"
  17 #include "ivtv-mailbox.h"
  18 #include "ivtv-routing.h"
  19 #include "ivtv-streams.h"
  20 #include "ivtv-yuv.h"
  21 #include "ivtv-ioctl.h"
  22 #include "ivtv-cards.h"
  23 #include "ivtv-firmware.h"
  24 #include <media/v4l2-event.h>
  25 #include <media/i2c/saa7115.h>
  26
  27 /* This function tries to claim the stream for a specific file descriptor.
  28    If no one else is using this stream then the stream is claimed and
  29    associated VBI streams are also automatically claimed.
  30    Possible error returns: -EBUSY if someone else has claimed
  31    the stream or 0 on success. */
  32 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  33 {
  34         struct ivtv *itv = id->itv;
  35         struct ivtv_stream *s = &itv->streams[type];
  36         struct ivtv_stream *s_vbi;
  37         int vbi_type;
  38
  39         if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
  40                 /* someone already claimed this stream */
  41                 if (s->fh == &id->fh) {
  42                         /* yes, this file descriptor did. So that's OK. */
  43                         return 0;
  44                 }
  45                 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
  46                                          type == IVTV_ENC_STREAM_TYPE_VBI)) {
  47                         /* VBI is handled already internally, now also assign
  48                            the file descriptor to this stream for external
  49                            reading of the stream. */
  50                         s->fh = &id->fh;
  51                         IVTV_DEBUG_INFO("Start Read VBI\n");
  52                         return 0;
  53                 }
  54                 /* someone else is using this stream already */
  55                 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  56                 return -EBUSY;
  57         }
  58         s->fh = &id->fh;
  59         if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  60                 /* Enable reinsertion interrupt */
  61                 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  62         }
  63
  64         /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  65            IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  66            (provided VBI insertion is on and sliced VBI is selected), for all
  67            other streams we're done */
  68         if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  69                 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  70         } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  71                    itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
  72                 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  73         } else {
  74                 return 0;
  75         }
  76         s_vbi = &itv->streams[vbi_type];
  77
  78         if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  79                 /* Enable reinsertion interrupt */
  80                 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  81                         ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  82         }
  83         /* mark that it is used internally */
  84         set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  85         return 0;
  86 }
  87 EXPORT_SYMBOL(ivtv_claim_stream);
  88
  89 /* This function releases a previously claimed stream. It will take into
  90    account associated VBI streams. */
  91 void ivtv_release_stream(struct ivtv_stream *s)
  92 {
  93         struct ivtv *itv = s->itv;
  94         struct ivtv_stream *s_vbi;
  95
  96         s->fh = NULL;
  97         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
  98                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
  99                 /* this stream is still in use internally */
 100                 return;
 101         }
 102         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 103                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 104                 return;
 105         }
 106
 107         ivtv_flush_queues(s);
 108
 109         /* disable reinsertion interrupt */
 110         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 111                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 112
 113         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 114            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 115            for all other streams we're done */
 116         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 117                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 118         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 119                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 120         else
 121                 return;
 122
 123         /* clear internal use flag */
 124         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 125                 /* was already cleared */
 126                 return;
 127         }
 128         if (s_vbi->fh) {
 129                 /* VBI stream still claimed by a file descriptor */
 130                 return;
 131         }
 132         /* disable reinsertion interrupt */
 133         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 134                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 135         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 136         ivtv_flush_queues(s_vbi);
 137 }
 138 EXPORT_SYMBOL(ivtv_release_stream);
 139
 140 static void ivtv_dualwatch(struct ivtv *itv)
 141 {
 142         struct v4l2_tuner vt;
 143         u32 new_stereo_mode;
 144         const u32 dual = 0x02;
 145
 146         new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
 147         memset(&vt, 0, sizeof(vt));
 148         ivtv_call_all(itv, tuner, g_tuner, &vt);
 149         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 150                 new_stereo_mode = dual;
 151
 152         if (new_stereo_mode == itv->dualwatch_stereo_mode)
 153                 return;
 154
 155         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
 156                            itv->dualwatch_stereo_mode, new_stereo_mode);
 157         if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
 158                 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 159 }
 160
 161 static void ivtv_update_pgm_info(struct ivtv *itv)
 162 {
 163         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 164         int cnt;
 165         int i = 0;
 166
 167         if (wr_idx >= itv->pgm_info_num) {
 168                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 169                 return;
 170         }
 171         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 172         while (i < cnt) {
 173                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 174                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 175                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 176                 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 177                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 178                                         // 1=I, 2=P, 4=B
 179
 180                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 181                 if (e->offset > itv->mpg_data_received) {
 182                         break;
 183                 }
 184                 e->offset += itv->vbi_data_inserted;
 185                 e->length = read_enc(addr);
 186                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 187                 e->flags = mapping[read_enc(addr + 12) & 7];
 188                 i++;
 189         }
 190         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 191 }
 192
 193 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 194 {
 195         struct ivtv *itv = s->itv;
 196         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 197         struct ivtv_buffer *buf;
 198         DEFINE_WAIT(wait);
 199
 200         *err = 0;
 201         while (1) {
 202                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 203                         /* Process pending program info updates and pending VBI data */
 204                         ivtv_update_pgm_info(itv);
 205
 206                         if (time_after(jiffies,
 207                                        itv->dualwatch_jiffies +
 208                                        msecs_to_jiffies(1000))) {
 209                                 itv->dualwatch_jiffies = jiffies;
 210                                 ivtv_dualwatch(itv);
 211                         }
 212
 213                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 214                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 215                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 216                                         /* byteswap and process VBI data */
 217                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 218                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 219                                 }
 220                         }
 221                         buf = &itv->vbi.sliced_mpeg_buf;
 222                         if (buf->readpos != buf->bytesused) {
 223                                 return buf;
 224                         }
 225                 }
 226
 227                 /* do we have leftover data? */
 228                 buf = ivtv_dequeue(s, &s->q_io);
 229                 if (buf)
 230                         return buf;
 231
 232                 /* do we have new data? */
 233                 buf = ivtv_dequeue(s, &s->q_full);
 234                 if (buf) {
 235                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 236                                 return buf;
 237                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 238                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 239                                 /* byteswap MPG data */
 240                                 ivtv_buf_swap(buf);
 241                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 242                                 /* byteswap and process VBI data */
 243                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 244                         }
 245                         return buf;
 246                 }
 247
 248                 /* return if end of stream */
 249                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 250                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 251                         return NULL;
 252                 }
 253
 254                 /* return if file was opened with O_NONBLOCK */
 255                 if (non_block) {
 256                         *err = -EAGAIN;
 257                         return NULL;
 258                 }
 259
 260                 /* wait for more data to arrive */
 261                 mutex_unlock(&itv->serialize_lock);
 262                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 263                 /* New buffers might have become available before we were added to the waitqueue */
 264                 if (!s->q_full.buffers)
 265                         schedule();
 266                 finish_wait(&s->waitq, &wait);
 267                 mutex_lock(&itv->serialize_lock);
 268                 if (signal_pending(current)) {
 269                         /* return if a signal was received */
 270                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 271                         *err = -EINTR;
 272                         return NULL;
 273                 }
 274         }
 275 }
 276
 277 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 278 {
 279         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 280
 281         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 282         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 283         itv->vbi.sliced_mpeg_buf.readpos = 0;
 284 }
 285
 286 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 287                 char __user *ubuf, size_t ucount)
 288 {
 289         struct ivtv *itv = s->itv;
 290         size_t len = buf->bytesused - buf->readpos;
 291
 292         if (len > ucount) len = ucount;
 293         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 294             !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
 295                 const char *start = buf->buf + buf->readpos;
 296                 const char *p = start + 1;
 297                 const u8 *q;
 298                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 299                 int stuffing, i;
 300
 301                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 302                         p = q + 1;
 303                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 304                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 305                                 continue;
 306                         }
 307                         if (!itv->search_pack_header) {
 308                                 if ((q[6] & 0xc0) != 0x80)
 309                                         continue;
 310                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 311                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 312                                         ch = 0xba;
 313                                         itv->search_pack_header = 1;
 314                                         p = q + 9;
 315                                 }
 316                                 continue;
 317                         }
 318                         stuffing = q[13] & 7;
 319                         /* all stuffing bytes must be 0xff */
 320                         for (i = 0; i < stuffing; i++)
 321                                 if (q[14 + i] != 0xff)
 322                                         break;
 323                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 324                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 325                                         q[16 + stuffing] == 1) {
 326                                 itv->search_pack_header = 0;
 327                                 len = (char *)q - start;
 328                                 ivtv_setup_sliced_vbi_buf(itv);
 329                                 break;
 330                         }
 331                 }
 332         }
 333         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 334                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 335                 return -EFAULT;
 336         }
 337         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 338                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 339                         buf == &itv->vbi.sliced_mpeg_buf); */
 340         buf->readpos += len;
 341         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 342                 itv->mpg_data_received += len;
 343         return len;
 344 }
 345
 346 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 347 {
 348         struct ivtv *itv = s->itv;
 349         size_t tot_written = 0;
 350         int single_frame = 0;
 351
 352         if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
 353                 /* shouldn't happen */
 354                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 355                 return -EIO;
 356         }
 357
 358         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 359            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 360         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 361             (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
 362                 single_frame = 1;
 363
 364         for (;;) {
 365                 struct ivtv_buffer *buf;
 366                 int rc;
 367
 368                 buf = ivtv_get_buffer(s, non_block, &rc);
 369                 /* if there is no data available... */
 370                 if (buf == NULL) {
 371                         /* if we got data, then return that regardless */
 372                         if (tot_written)
 373                                 break;
 374                         /* EOS condition */
 375                         if (rc == 0) {
 376                                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 377                                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 378                                 ivtv_release_stream(s);
 379                         }
 380                         /* set errno */
 381                         return rc;
 382                 }
 383                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 384                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 385                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 386                 }
 387                 else if (buf->readpos == buf->bytesused) {
 388                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 389                         itv->vbi.sliced_mpeg_size[idx] = 0;
 390                         itv->vbi.inserted_frame++;
 391                         itv->vbi_data_inserted += buf->bytesused;
 392                 }
 393                 if (rc < 0)
 394                         return rc;
 395                 tot_written += rc;
 396
 397                 if (tot_written == tot_count || single_frame)
 398                         break;
 399         }
 400         return tot_written;
 401 }
 402
 403 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 404                         loff_t *pos, int non_block)
 405 {
 406         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 407         struct ivtv *itv = s->itv;
 408
 409         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 410         if (rc > 0)
 411                 *pos += rc;
 412         return rc;
 413 }
 414
 415 int ivtv_start_capture(struct ivtv_open_id *id)
 416 {
 417         struct ivtv *itv = id->itv;
 418         struct ivtv_stream *s = &itv->streams[id->type];
 419         struct ivtv_stream *s_vbi;
 420
 421         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 422             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 423             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 424             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 425                 /* you cannot read from these stream types. */
 426                 return -EINVAL;
 427         }
 428
 429         /* Try to claim this stream. */
 430         if (ivtv_claim_stream(id, s->type))
 431                 return -EBUSY;
 432
 433         /* This stream does not need to start capturing */
 434         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 435                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 436                 return 0;
 437         }
 438
 439         /* If capture is already in progress, then we also have to
 440            do nothing extra. */
 441         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 442                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 443                 return 0;
 444         }
 445
 446         /* Start VBI capture if required */
 447         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 448         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 449             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 450             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 451                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 452                    automatically when the MPG stream is claimed.
 453                    We only need to start the VBI capturing. */
 454                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 455                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 456
 457                         /* Failure, clean up and return an error */
 458                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 459                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 460                         /* also releases the associated VBI stream */
 461                         ivtv_release_stream(s);
 462                         return -EIO;
 463                 }
 464                 IVTV_DEBUG_INFO("VBI insertion started\n");
 465         }
 466
 467         /* Tell the card to start capturing */
 468         if (!ivtv_start_v4l2_encode_stream(s)) {
 469                 /* We're done */
 470                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 471                 /* Resume a possibly paused encoder */
 472                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 473                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 474                 return 0;
 475         }
 476
 477         /* failure, clean up */
 478         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 479
 480         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 481            automatically when the MPG stream is released.
 482            We only need to stop the VBI capturing. */
 483         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 484             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 485                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 486                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 487         }
 488         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 489         ivtv_release_stream(s);
 490         return -EIO;
 491 }
 492
 493 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 494 {
 495         struct ivtv_open_id *id = fh2id(filp->private_data);
 496         struct ivtv *itv = id->itv;
 497         struct ivtv_stream *s = &itv->streams[id->type];
 498         ssize_t rc;
 499
 500         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 501
 502         if (mutex_lock_interruptible(&itv->serialize_lock))
 503                 return -ERESTARTSYS;
 504         rc = ivtv_start_capture(id);
 505         if (!rc)
 506                 rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 507         mutex_unlock(&itv->serialize_lock);
 508         return rc;
 509 }
 510
 511 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 512 {
 513         struct ivtv *itv = id->itv;
 514         struct ivtv_stream *s = &itv->streams[id->type];
 515         int rc;
 516
 517         if (atomic_read(&itv->decoding) == 0) {
 518                 if (ivtv_claim_stream(id, s->type)) {
 519                         /* someone else is using this stream already */
 520                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 521                         return -EBUSY;
 522                 }
 523                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 524                 if (rc < 0) {
 525                         if (rc == -EAGAIN)
 526                                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 527                         if (rc < 0)
 528                                 return rc;
 529                 }
 530         }
 531         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 532                 return ivtv_set_speed(itv, speed);
 533         return 0;
 534 }
 535
 536 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 537 {
 538         struct ivtv_open_id *id = fh2id(filp->private_data);
 539         struct ivtv *itv = id->itv;
 540         struct ivtv_stream *s = &itv->streams[id->type];
 541         struct yuv_playback_info *yi = &itv->yuv_info;
 542         struct ivtv_buffer *buf;
 543         struct ivtv_queue q;
 544         int bytes_written = 0;
 545         int mode;
 546         int rc;
 547         DEFINE_WAIT(wait);
 548
 549         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 550
 551         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 552             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 553             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 554                 /* not decoder streams */
 555                 return -EINVAL;
 556
 557         /* Try to claim this stream */
 558         if (ivtv_claim_stream(id, s->type))
 559                 return -EBUSY;
 560
 561         /* This stream does not need to start any decoding */
 562         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 563                 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
 564
 565                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 566                 return ivtv_write_vbi_from_user(itv,
 567                    (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
 568         }
 569
 570         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 571
 572         if (ivtv_set_output_mode(itv, mode) != mode) {
 573             ivtv_release_stream(s);
 574             return -EBUSY;
 575         }
 576         ivtv_queue_init(&q);
 577         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 578
 579         /* Start decoder (returns 0 if already started) */
 580         rc = ivtv_start_decoding(id, itv->speed);
 581         if (rc) {
 582                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 583
 584                 /* failure, clean up */
 585                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 586                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 587                 return rc;
 588         }
 589
 590 retry:
 591         /* If possible, just DMA the entire frame - Check the data transfer size
 592         since we may get here before the stream has been fully set-up */
 593         if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
 594                 while (count >= itv->dma_data_req_size) {
 595                         rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
 596
 597                         if (rc < 0)
 598                                 return rc;
 599
 600                         bytes_written += itv->dma_data_req_size;
 601                         user_buf += itv->dma_data_req_size;
 602                         count -= itv->dma_data_req_size;
 603                 }
 604                 if (count == 0) {
 605                         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 606                         return bytes_written;
 607                 }
 608         }
 609
 610         for (;;) {
 611                 /* Gather buffers */
 612                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 613                         ivtv_enqueue(s, buf, &q);
 614                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 615                         ivtv_enqueue(s, buf, &q);
 616                 }
 617                 if (q.buffers)
 618                         break;
 619                 if (filp->f_flags & O_NONBLOCK)
 620                         return -EAGAIN;
 621                 mutex_unlock(&itv->serialize_lock);
 622                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 623                 /* New buffers might have become free before we were added to the waitqueue */
 624                 if (!s->q_free.buffers)
 625                         schedule();
 626                 finish_wait(&s->waitq, &wait);
 627                 mutex_lock(&itv->serialize_lock);
 628                 if (signal_pending(current)) {
 629                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 630                         return -EINTR;
 631                 }
 632         }
 633
 634         /* copy user data into buffers */
 635         while ((buf = ivtv_dequeue(s, &q))) {
 636                 /* yuv is a pain. Don't copy more data than needed for a single
 637                    frame, otherwise we lose sync with the incoming stream */
 638                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 639                     yi->stream_size + count > itv->dma_data_req_size)
 640                         rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
 641                                 itv->dma_data_req_size - yi->stream_size);
 642                 else
 643                         rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 644
 645                 /* Make sure we really got all the user data */
 646                 if (rc < 0) {
 647                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 648                         return rc;
 649                 }
 650                 user_buf += rc;
 651                 count -= rc;
 652                 bytes_written += rc;
 653
 654                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 655                         yi->stream_size += rc;
 656                         /* If we have a complete yuv frame, break loop now */
 657                         if (yi->stream_size == itv->dma_data_req_size) {
 658                                 ivtv_enqueue(s, buf, &s->q_full);
 659                                 yi->stream_size = 0;
 660                                 break;
 661                         }
 662                 }
 663
 664                 if (buf->bytesused != s->buf_size) {
 665                         /* incomplete, leave in q_io for next time */
 666                         ivtv_enqueue(s, buf, &s->q_io);
 667                         break;
 668                 }
 669                 /* Byteswap MPEG buffer */
 670                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 671                         ivtv_buf_swap(buf);
 672                 ivtv_enqueue(s, buf, &s->q_full);
 673         }
 674
 675         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 676                 if (s->q_full.length >= itv->dma_data_req_size) {
 677                         int got_sig;
 678
 679                         if (mode == OUT_YUV)
 680                                 ivtv_yuv_setup_stream_frame(itv);
 681
 682                         mutex_unlock(&itv->serialize_lock);
 683                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 684                         while (!(got_sig = signal_pending(current)) &&
 685                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 686                                 schedule();
 687                         }
 688                         finish_wait(&itv->dma_waitq, &wait);
 689                         mutex_lock(&itv->serialize_lock);
 690                         if (got_sig) {
 691                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 692                                 return -EINTR;
 693                         }
 694
 695                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 696                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 697                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 698                 }
 699         }
 700         /* more user data is available, wait until buffers become free
 701            to transfer the rest. */
 702         if (count && !(filp->f_flags & O_NONBLOCK))
 703                 goto retry;
 704         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 705         return bytes_written;
 706 }
 707
 708 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 709 {
 710         struct ivtv_open_id *id = fh2id(filp->private_data);
 711         struct ivtv *itv = id->itv;
 712         ssize_t res;
 713
 714         if (mutex_lock_interruptible(&itv->serialize_lock))
 715                 return -ERESTARTSYS;
 716         res = ivtv_write(filp, user_buf, count, pos);
 717         mutex_unlock(&itv->serialize_lock);
 718         return res;
 719 }
 720
 721 __poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 722 {
 723         struct ivtv_open_id *id = fh2id(filp->private_data);
 724         struct ivtv *itv = id->itv;
 725         struct ivtv_stream *s = &itv->streams[id->type];
 726         __poll_t res = 0;
 727
 728         /* add stream's waitq to the poll list */
 729         IVTV_DEBUG_HI_FILE("Decoder poll\n");
 730
 731         /* If there are subscribed events, then only use the new event
 732            API instead of the old video.h based API. */
 733         if (!list_empty(&id->fh.subscribed)) {
 734                 poll_wait(filp, &id->fh.wait, wait);
 735                 /* Turn off the old-style vsync events */
 736                 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 737                 if (v4l2_event_pending(&id->fh))
 738                         res = EPOLLPRI;
 739         } else {
 740                 /* This is the old-style API which is here only for backwards
 741                    compatibility. */
 742                 poll_wait(filp, &s->waitq, wait);
 743                 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 744                 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 745                     test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 746                         res = EPOLLPRI;
 747         }
 748
 749         /* Allow write if buffers are available for writing */
 750         if (s->q_free.buffers)
 751                 res |= EPOLLOUT | EPOLLWRNORM;
 752         return res;
 753 }
 754
 755 __poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
 756 {
 757         __poll_t req_events = poll_requested_events(wait);
 758         struct ivtv_open_id *id = fh2id(filp->private_data);
 759         struct ivtv *itv = id->itv;
 760         struct ivtv_stream *s = &itv->streams[id->type];
 761         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 762         __poll_t res = 0;
 763
 764         /* Start a capture if there is none */
 765         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
 766                         s->type != IVTV_ENC_STREAM_TYPE_RAD &&
 767                         (req_events & (EPOLLIN | EPOLLRDNORM))) {
 768                 int rc;
 769
 770                 mutex_lock(&itv->serialize_lock);
 771                 rc = ivtv_start_capture(id);
 772                 mutex_unlock(&itv->serialize_lock);
 773                 if (rc) {
 774                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 775                                         s->name, rc);
 776                         return EPOLLERR;
 777                 }
 778                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 779         }
 780
 781         /* add stream's waitq to the poll list */
 782         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 783         poll_wait(filp, &s->waitq, wait);
 784         if (v4l2_event_pending(&id->fh))
 785                 res |= EPOLLPRI;
 786         else
 787                 poll_wait(filp, &id->fh.wait, wait);
 788
 789         if (s->q_full.length || s->q_io.length)
 790                 return res | EPOLLIN | EPOLLRDNORM;
 791         if (eof)
 792                 return res | EPOLLHUP;
 793         return res;
 794 }
 795
 796 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 797 {
 798         struct ivtv *itv = id->itv;
 799         struct ivtv_stream *s = &itv->streams[id->type];
 800
 801         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 802
 803         /* 'Unclaim' this stream */
 804
 805         /* Stop capturing */
 806         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 807                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 808
 809                 IVTV_DEBUG_INFO("close stopping capture\n");
 810                 /* Special case: a running VBI capture for VBI insertion
 811                    in the mpeg stream. Need to stop that too. */
 812                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 813                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 814                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 815                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 816                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 817                 }
 818                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 819                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 820                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 821                         /* Also used internally, don't stop capturing */
 822                         s->fh = NULL;
 823                 }
 824                 else {
 825                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 826                 }
 827         }
 828         if (!gop_end) {
 829                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 830                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 831                 ivtv_release_stream(s);
 832         }
 833 }
 834
 835 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 836 {
 837         struct ivtv *itv = id->itv;
 838         struct ivtv_stream *s = &itv->streams[id->type];
 839
 840         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 841
 842         if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
 843                 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 844                 /* Restore registers we've changed & clean up any mess */
 845                 ivtv_yuv_close(itv);
 846         }
 847
 848         /* Stop decoding */
 849         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 850                 IVTV_DEBUG_INFO("close stopping decode\n");
 851
 852                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 853                 itv->output_mode = OUT_NONE;
 854         }
 855         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 856         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 857
 858         if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 859                 itv->output_mode = OUT_NONE;
 860
 861         itv->speed = 0;
 862         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 863         ivtv_release_stream(s);
 864 }
 865
 866 int ivtv_v4l2_close(struct file *filp)
 867 {
 868         struct v4l2_fh *fh = filp->private_data;
 869         struct ivtv_open_id *id = fh2id(fh);
 870         struct ivtv *itv = id->itv;
 871         struct ivtv_stream *s = &itv->streams[id->type];
 872
 873         IVTV_DEBUG_FILE("close %s\n", s->name);
 874
 875         mutex_lock(&itv->serialize_lock);
 876
 877         /* Stop radio */
 878         if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
 879                         v4l2_fh_is_singular_file(filp)) {
 880                 /* Closing radio device, return to TV mode */
 881                 ivtv_mute(itv);
 882                 /* Mark that the radio is no longer in use */
 883                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 884                 /* Switch tuner to TV */
 885                 ivtv_call_all(itv, video, s_std, itv->std);
 886                 /* Select correct audio input (i.e. TV tuner or Line in) */
 887                 ivtv_audio_set_io(itv);
 888                 if (itv->hw_flags & IVTV_HW_SAA711X) {
 889                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 890                                         SAA7115_FREQ_32_11_MHZ, 0);
 891                 }
 892                 if (atomic_read(&itv->capturing) > 0) {
 893                         /* Undo video mute */
 894                         ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
 895                                         v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
 896                                         (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
 897                 }
 898                 /* Done! Unmute and continue. */
 899                 ivtv_unmute(itv);
 900         }
 901
 902         v4l2_fh_del(fh);
 903         v4l2_fh_exit(fh);
 904
 905         /* Easy case first: this stream was never claimed by us */
 906         if (s->fh != &id->fh)
 907                 goto close_done;
 908
 909         /* 'Unclaim' this stream */
 910
 911         if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 912                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 913
 914                 ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
 915
 916                 /* If all output streams are closed, and if the user doesn't have
 917                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
 918                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 919                         /* disable CC on TV-out */
 920                         ivtv_disable_cc(itv);
 921                 }
 922         } else {
 923                 ivtv_stop_capture(id, 0);
 924         }
 925 close_done:
 926         kfree(id);
 927         mutex_unlock(&itv->serialize_lock);
 928         return 0;
 929 }
 930
 931 static int ivtv_open(struct file *filp)
 932 {
 933         struct video_device *vdev = video_devdata(filp);
 934         struct ivtv_stream *s = video_get_drvdata(vdev);
 935         struct ivtv *itv = s->itv;
 936         struct ivtv_open_id *item;
 937         int res = 0;
 938
 939         IVTV_DEBUG_FILE("open %s\n", s->name);
 940
 941         if (ivtv_init_on_first_open(itv)) {
 942                 IVTV_ERR("Failed to initialize on device %s\n",
 943                          video_device_node_name(vdev));
 944                 return -ENXIO;
 945         }
 946
 947 #ifdef CONFIG_VIDEO_ADV_DEBUG
 948         /* Unless ivtv_fw_debug is set, error out if firmware dead. */
 949         if (ivtv_fw_debug) {
 950                 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
 951                           video_device_node_name(vdev));
 952                 IVTV_WARN("Selected firmware errors will be ignored\n");
 953         } else {
 954 #else
 955         if (1) {
 956 #endif
 957                 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 958                 if (res == -EAGAIN)
 959                         res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 960                 if (res < 0)
 961                         return -EIO;
 962         }
 963
 964         if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 965                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 966                 return -EBUSY;
 967
 968         if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 969                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 970                 return -EBUSY;
 971
 972         if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 973                 if (read_reg(0x82c) == 0) {
 974                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 975                         /* return -ENODEV; */
 976                 }
 977                 ivtv_udma_alloc(itv);
 978         }
 979
 980         /* Allocate memory */
 981         item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 982         if (NULL == item) {
 983                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 984                 return -ENOMEM;
 985         }
 986         v4l2_fh_init(&item->fh, &s->vdev);
 987         item->itv = itv;
 988         item->type = s->type;
 989
 990         filp->private_data = &item->fh;
 991         v4l2_fh_add(&item->fh);
 992
 993         if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
 994                         v4l2_fh_is_singular_file(filp)) {
 995                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
 996                         if (atomic_read(&itv->capturing) > 0) {
 997                                 /* switching to radio while capture is
 998                                    in progress is not polite */
 999                                 v4l2_fh_del(&item->fh);
1000                                 v4l2_fh_exit(&item->fh);
1001                                 kfree(item);
1002                                 return -EBUSY;
1003                         }
1004                 }
1005                 /* Mark that the radio is being used. */
1006                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1007                 /* We have the radio */
1008                 ivtv_mute(itv);
1009                 /* Switch tuner to radio */
1010                 ivtv_call_all(itv, tuner, s_radio);
1011                 /* Select the correct audio input (i.e. radio tuner) */
1012                 ivtv_audio_set_io(itv);
1013                 if (itv->hw_flags & IVTV_HW_SAA711X) {
1014                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1015                                 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1016                 }
1017                 /* Done! Unmute and continue. */
1018                 ivtv_unmute(itv);
1019         }
1020
1021         /* YUV or MPG Decoding Mode? */
1022         if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1023                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1024         } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1025                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1026                 /* For yuv, we need to know the dma size before we start */
1027                 itv->dma_data_req_size =
1028                                 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1029                 itv->yuv_info.stream_size = 0;
1030         }
1031         return 0;
1032 }
1033
1034 int ivtv_v4l2_open(struct file *filp)
1035 {
1036         struct video_device *vdev = video_devdata(filp);
1037         int res;
1038
1039         if (mutex_lock_interruptible(vdev->lock))
1040                 return -ERESTARTSYS;
1041         res = ivtv_open(filp);
1042         mutex_unlock(vdev->lock);
1043         return res;
1044 }
1045
1046 void ivtv_mute(struct ivtv *itv)
1047 {
1048         if (atomic_read(&itv->capturing))
1049                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1050         IVTV_DEBUG_INFO("Mute\n");
1051 }
1052
1053 void ivtv_unmute(struct ivtv *itv)
1054 {
1055         if (atomic_read(&itv->capturing)) {
1056                 ivtv_msleep_timeout(100, 0);
1057                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1058                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1059         }
1060         IVTV_DEBUG_INFO("Unmute\n");
1061 }