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

   1 /*
   2     file operation functions
   3     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   4     Copyright (C) 2004  Chris Kennedy <c@groovy.org>
   5     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "ivtv-driver.h"
  23 #include "ivtv-fileops.h"
  24 #include "ivtv-i2c.h"
  25 #include "ivtv-queue.h"
  26 #include "ivtv-udma.h"
  27 #include "ivtv-irq.h"
  28 #include "ivtv-vbi.h"
  29 #include "ivtv-mailbox.h"
  30 #include "ivtv-routing.h"
  31 #include "ivtv-streams.h"
  32 #include "ivtv-yuv.h"
  33 #include "ivtv-ioctl.h"
  34 #include "ivtv-cards.h"
  35 #include "ivtv-firmware.h"
  36 #include <media/v4l2-event.h>
  37 #include <media/saa7115.h>
  38
  39 /* This function tries to claim the stream for a specific file descriptor.
  40    If no one else is using this stream then the stream is claimed and
  41    associated VBI streams are also automatically claimed.
  42    Possible error returns: -EBUSY if someone else has claimed
  43    the stream or 0 on success. */
  44 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  45 {
  46         struct ivtv *itv = id->itv;
  47         struct ivtv_stream *s = &itv->streams[type];
  48         struct ivtv_stream *s_vbi;
  49         int vbi_type;
  50
  51         if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
  52                 /* someone already claimed this stream */
  53                 if (s->fh == &id->fh) {
  54                         /* yes, this file descriptor did. So that's OK. */
  55                         return 0;
  56                 }
  57                 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
  58                                          type == IVTV_ENC_STREAM_TYPE_VBI)) {
  59                         /* VBI is handled already internally, now also assign
  60                            the file descriptor to this stream for external
  61                            reading of the stream. */
  62                         s->fh = &id->fh;
  63                         IVTV_DEBUG_INFO("Start Read VBI\n");
  64                         return 0;
  65                 }
  66                 /* someone else is using this stream already */
  67                 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  68                 return -EBUSY;
  69         }
  70         s->fh = &id->fh;
  71         if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  72                 /* Enable reinsertion interrupt */
  73                 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  74         }
  75
  76         /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  77            IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  78            (provided VBI insertion is on and sliced VBI is selected), for all
  79            other streams we're done */
  80         if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  81                 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  82         } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  83                    itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
  84                 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  85         } else {
  86                 return 0;
  87         }
  88         s_vbi = &itv->streams[vbi_type];
  89
  90         if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  91                 /* Enable reinsertion interrupt */
  92                 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  93                         ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  94         }
  95         /* mark that it is used internally */
  96         set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  97         return 0;
  98 }
  99 EXPORT_SYMBOL(ivtv_claim_stream);
 100
 101 /* This function releases a previously claimed stream. It will take into
 102    account associated VBI streams. */
 103 void ivtv_release_stream(struct ivtv_stream *s)
 104 {
 105         struct ivtv *itv = s->itv;
 106         struct ivtv_stream *s_vbi;
 107
 108         s->fh = NULL;
 109         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 110                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 111                 /* this stream is still in use internally */
 112                 return;
 113         }
 114         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 115                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 116                 return;
 117         }
 118
 119         ivtv_flush_queues(s);
 120
 121         /* disable reinsertion interrupt */
 122         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 123                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 124
 125         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 126            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 127            for all other streams we're done */
 128         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 129                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 130         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 131                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 132         else
 133                 return;
 134
 135         /* clear internal use flag */
 136         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 137                 /* was already cleared */
 138                 return;
 139         }
 140         if (s_vbi->fh) {
 141                 /* VBI stream still claimed by a file descriptor */
 142                 return;
 143         }
 144         /* disable reinsertion interrupt */
 145         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 146                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 147         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 148         ivtv_flush_queues(s_vbi);
 149 }
 150 EXPORT_SYMBOL(ivtv_release_stream);
 151
 152 static void ivtv_dualwatch(struct ivtv *itv)
 153 {
 154         struct v4l2_tuner vt;
 155         u32 new_stereo_mode;
 156         const u32 dual = 0x02;
 157
 158         new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
 159         memset(&vt, 0, sizeof(vt));
 160         ivtv_call_all(itv, tuner, g_tuner, &vt);
 161         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 162                 new_stereo_mode = dual;
 163
 164         if (new_stereo_mode == itv->dualwatch_stereo_mode)
 165                 return;
 166
 167         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
 168                            itv->dualwatch_stereo_mode, new_stereo_mode);
 169         if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
 170                 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 171 }
 172
 173 static void ivtv_update_pgm_info(struct ivtv *itv)
 174 {
 175         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 176         int cnt;
 177         int i = 0;
 178
 179         if (wr_idx >= itv->pgm_info_num) {
 180                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 181                 return;
 182         }
 183         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 184         while (i < cnt) {
 185                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 186                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 187                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 188                 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 189                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 190                                         // 1=I, 2=P, 4=B
 191
 192                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 193                 if (e->offset > itv->mpg_data_received) {
 194                         break;
 195                 }
 196                 e->offset += itv->vbi_data_inserted;
 197                 e->length = read_enc(addr);
 198                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 199                 e->flags = mapping[read_enc(addr + 12) & 7];
 200                 i++;
 201         }
 202         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 203 }
 204
 205 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 206 {
 207         struct ivtv *itv = s->itv;
 208         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 209         struct ivtv_buffer *buf;
 210         DEFINE_WAIT(wait);
 211
 212         *err = 0;
 213         while (1) {
 214                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 215                         /* Process pending program info updates and pending VBI data */
 216                         ivtv_update_pgm_info(itv);
 217
 218                         if (time_after(jiffies,
 219                                        itv->dualwatch_jiffies +
 220                                        msecs_to_jiffies(1000))) {
 221                                 itv->dualwatch_jiffies = jiffies;
 222                                 ivtv_dualwatch(itv);
 223                         }
 224
 225                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 226                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 227                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 228                                         /* byteswap and process VBI data */
 229                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 230                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 231                                 }
 232                         }
 233                         buf = &itv->vbi.sliced_mpeg_buf;
 234                         if (buf->readpos != buf->bytesused) {
 235                                 return buf;
 236                         }
 237                 }
 238
 239                 /* do we have leftover data? */
 240                 buf = ivtv_dequeue(s, &s->q_io);
 241                 if (buf)
 242                         return buf;
 243
 244                 /* do we have new data? */
 245                 buf = ivtv_dequeue(s, &s->q_full);
 246                 if (buf) {
 247                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 248                                 return buf;
 249                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 250                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 251                                 /* byteswap MPG data */
 252                                 ivtv_buf_swap(buf);
 253                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 254                                 /* byteswap and process VBI data */
 255                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 256                         }
 257                         return buf;
 258                 }
 259
 260                 /* return if end of stream */
 261                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 262                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 263                         return NULL;
 264                 }
 265
 266                 /* return if file was opened with O_NONBLOCK */
 267                 if (non_block) {
 268                         *err = -EAGAIN;
 269                         return NULL;
 270                 }
 271
 272                 /* wait for more data to arrive */
 273                 mutex_unlock(&itv->serialize_lock);
 274                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 275                 /* New buffers might have become available before we were added to the waitqueue */
 276                 if (!s->q_full.buffers)
 277                         schedule();
 278                 finish_wait(&s->waitq, &wait);
 279                 mutex_lock(&itv->serialize_lock);
 280                 if (signal_pending(current)) {
 281                         /* return if a signal was received */
 282                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 283                         *err = -EINTR;
 284                         return NULL;
 285                 }
 286         }
 287 }
 288
 289 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 290 {
 291         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 292
 293         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 294         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 295         itv->vbi.sliced_mpeg_buf.readpos = 0;
 296 }
 297
 298 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 299                 char __user *ubuf, size_t ucount)
 300 {
 301         struct ivtv *itv = s->itv;
 302         size_t len = buf->bytesused - buf->readpos;
 303
 304         if (len > ucount) len = ucount;
 305         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 306             !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
 307                 const char *start = buf->buf + buf->readpos;
 308                 const char *p = start + 1;
 309                 const u8 *q;
 310                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 311                 int stuffing, i;
 312
 313                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 314                         p = q + 1;
 315                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 316                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 317                                 continue;
 318                         }
 319                         if (!itv->search_pack_header) {
 320                                 if ((q[6] & 0xc0) != 0x80)
 321                                         continue;
 322                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 323                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 324                                         ch = 0xba;
 325                                         itv->search_pack_header = 1;
 326                                         p = q + 9;
 327                                 }
 328                                 continue;
 329                         }
 330                         stuffing = q[13] & 7;
 331                         /* all stuffing bytes must be 0xff */
 332                         for (i = 0; i < stuffing; i++)
 333                                 if (q[14 + i] != 0xff)
 334                                         break;
 335                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 336                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 337                                         q[16 + stuffing] == 1) {
 338                                 itv->search_pack_header = 0;
 339                                 len = (char *)q - start;
 340                                 ivtv_setup_sliced_vbi_buf(itv);
 341                                 break;
 342                         }
 343                 }
 344         }
 345         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 346                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 347                 return -EFAULT;
 348         }
 349         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 350                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 351                         buf == &itv->vbi.sliced_mpeg_buf); */
 352         buf->readpos += len;
 353         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 354                 itv->mpg_data_received += len;
 355         return len;
 356 }
 357
 358 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 359 {
 360         struct ivtv *itv = s->itv;
 361         size_t tot_written = 0;
 362         int single_frame = 0;
 363
 364         if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
 365                 /* shouldn't happen */
 366                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 367                 return -EIO;
 368         }
 369
 370         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 371            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 372         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 373             (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
 374                 single_frame = 1;
 375
 376         for (;;) {
 377                 struct ivtv_buffer *buf;
 378                 int rc;
 379
 380                 buf = ivtv_get_buffer(s, non_block, &rc);
 381                 /* if there is no data available... */
 382                 if (buf == NULL) {
 383                         /* if we got data, then return that regardless */
 384                         if (tot_written)
 385                                 break;
 386                         /* EOS condition */
 387                         if (rc == 0) {
 388                                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 389                                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 390                                 ivtv_release_stream(s);
 391                         }
 392                         /* set errno */
 393                         return rc;
 394                 }
 395                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 396                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 397                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 398                 }
 399                 else if (buf->readpos == buf->bytesused) {
 400                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 401                         itv->vbi.sliced_mpeg_size[idx] = 0;
 402                         itv->vbi.inserted_frame++;
 403                         itv->vbi_data_inserted += buf->bytesused;
 404                 }
 405                 if (rc < 0)
 406                         return rc;
 407                 tot_written += rc;
 408
 409                 if (tot_written == tot_count || single_frame)
 410                         break;
 411         }
 412         return tot_written;
 413 }
 414
 415 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 416                         loff_t *pos, int non_block)
 417 {
 418         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 419         struct ivtv *itv = s->itv;
 420
 421         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 422         if (rc > 0)
 423                 pos += rc;
 424         return rc;
 425 }
 426
 427 int ivtv_start_capture(struct ivtv_open_id *id)
 428 {
 429         struct ivtv *itv = id->itv;
 430         struct ivtv_stream *s = &itv->streams[id->type];
 431         struct ivtv_stream *s_vbi;
 432
 433         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 434             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 435             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 436             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 437                 /* you cannot read from these stream types. */
 438                 return -EINVAL;
 439         }
 440
 441         /* Try to claim this stream. */
 442         if (ivtv_claim_stream(id, s->type))
 443                 return -EBUSY;
 444
 445         /* This stream does not need to start capturing */
 446         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 447                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 448                 return 0;
 449         }
 450
 451         /* If capture is already in progress, then we also have to
 452            do nothing extra. */
 453         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 454                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 455                 return 0;
 456         }
 457
 458         /* Start VBI capture if required */
 459         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 460         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 461             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 462             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 463                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 464                    automatically when the MPG stream is claimed.
 465                    We only need to start the VBI capturing. */
 466                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 467                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 468
 469                         /* Failure, clean up and return an error */
 470                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 471                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 472                         /* also releases the associated VBI stream */
 473                         ivtv_release_stream(s);
 474                         return -EIO;
 475                 }
 476                 IVTV_DEBUG_INFO("VBI insertion started\n");
 477         }
 478
 479         /* Tell the card to start capturing */
 480         if (!ivtv_start_v4l2_encode_stream(s)) {
 481                 /* We're done */
 482                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 483                 /* Resume a possibly paused encoder */
 484                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 485                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 486                 return 0;
 487         }
 488
 489         /* failure, clean up */
 490         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 491
 492         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 493            automatically when the MPG stream is released.
 494            We only need to stop the VBI capturing. */
 495         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 496             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 497                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 498                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 499         }
 500         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 501         ivtv_release_stream(s);
 502         return -EIO;
 503 }
 504
 505 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 506 {
 507         struct ivtv_open_id *id = fh2id(filp->private_data);
 508         struct ivtv *itv = id->itv;
 509         struct ivtv_stream *s = &itv->streams[id->type];
 510         ssize_t rc;
 511
 512         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 513
 514         if (mutex_lock_interruptible(&itv->serialize_lock))
 515                 return -ERESTARTSYS;
 516         rc = ivtv_start_capture(id);
 517         if (!rc)
 518                 rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 519         mutex_unlock(&itv->serialize_lock);
 520         return rc;
 521 }
 522
 523 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 524 {
 525         struct ivtv *itv = id->itv;
 526         struct ivtv_stream *s = &itv->streams[id->type];
 527         int rc;
 528
 529         if (atomic_read(&itv->decoding) == 0) {
 530                 if (ivtv_claim_stream(id, s->type)) {
 531                         /* someone else is using this stream already */
 532                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 533                         return -EBUSY;
 534                 }
 535                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 536                 if (rc < 0) {
 537                         if (rc == -EAGAIN)
 538                                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 539                         if (rc < 0)
 540                                 return rc;
 541                 }
 542         }
 543         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 544                 return ivtv_set_speed(itv, speed);
 545         return 0;
 546 }
 547
 548 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 549 {
 550         struct ivtv_open_id *id = fh2id(filp->private_data);
 551         struct ivtv *itv = id->itv;
 552         struct ivtv_stream *s = &itv->streams[id->type];
 553         struct yuv_playback_info *yi = &itv->yuv_info;
 554         struct ivtv_buffer *buf;
 555         struct ivtv_queue q;
 556         int bytes_written = 0;
 557         int mode;
 558         int rc;
 559         DEFINE_WAIT(wait);
 560
 561         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 562
 563         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 564             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 565             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 566                 /* not decoder streams */
 567                 return -EINVAL;
 568
 569         /* Try to claim this stream */
 570         if (ivtv_claim_stream(id, s->type))
 571                 return -EBUSY;
 572
 573         /* This stream does not need to start any decoding */
 574         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 575                 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
 576
 577                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 578                 return ivtv_write_vbi_from_user(itv,
 579                    (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
 580         }
 581
 582         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 583
 584         if (ivtv_set_output_mode(itv, mode) != mode) {
 585             ivtv_release_stream(s);
 586             return -EBUSY;
 587         }
 588         ivtv_queue_init(&q);
 589         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 590
 591         /* Start decoder (returns 0 if already started) */
 592         rc = ivtv_start_decoding(id, itv->speed);
 593         if (rc) {
 594                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 595
 596                 /* failure, clean up */
 597                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 598                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 599                 return rc;
 600         }
 601
 602 retry:
 603         /* If possible, just DMA the entire frame - Check the data transfer size
 604         since we may get here before the stream has been fully set-up */
 605         if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
 606                 while (count >= itv->dma_data_req_size) {
 607                         rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
 608
 609                         if (rc < 0)
 610                                 return rc;
 611
 612                         bytes_written += itv->dma_data_req_size;
 613                         user_buf += itv->dma_data_req_size;
 614                         count -= itv->dma_data_req_size;
 615                 }
 616                 if (count == 0) {
 617                         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 618                         return bytes_written;
 619                 }
 620         }
 621
 622         for (;;) {
 623                 /* Gather buffers */
 624                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 625                         ivtv_enqueue(s, buf, &q);
 626                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 627                         ivtv_enqueue(s, buf, &q);
 628                 }
 629                 if (q.buffers)
 630                         break;
 631                 if (filp->f_flags & O_NONBLOCK)
 632                         return -EAGAIN;
 633                 mutex_unlock(&itv->serialize_lock);
 634                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 635                 /* New buffers might have become free before we were added to the waitqueue */
 636                 if (!s->q_free.buffers)
 637                         schedule();
 638                 finish_wait(&s->waitq, &wait);
 639                 mutex_lock(&itv->serialize_lock);
 640                 if (signal_pending(current)) {
 641                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 642                         return -EINTR;
 643                 }
 644         }
 645
 646         /* copy user data into buffers */
 647         while ((buf = ivtv_dequeue(s, &q))) {
 648                 /* yuv is a pain. Don't copy more data than needed for a single
 649                    frame, otherwise we lose sync with the incoming stream */
 650                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 651                     yi->stream_size + count > itv->dma_data_req_size)
 652                         rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
 653                                 itv->dma_data_req_size - yi->stream_size);
 654                 else
 655                         rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 656
 657                 /* Make sure we really got all the user data */
 658                 if (rc < 0) {
 659                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 660                         return rc;
 661                 }
 662                 user_buf += rc;
 663                 count -= rc;
 664                 bytes_written += rc;
 665
 666                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 667                         yi->stream_size += rc;
 668                         /* If we have a complete yuv frame, break loop now */
 669                         if (yi->stream_size == itv->dma_data_req_size) {
 670                                 ivtv_enqueue(s, buf, &s->q_full);
 671                                 yi->stream_size = 0;
 672                                 break;
 673                         }
 674                 }
 675
 676                 if (buf->bytesused != s->buf_size) {
 677                         /* incomplete, leave in q_io for next time */
 678                         ivtv_enqueue(s, buf, &s->q_io);
 679                         break;
 680                 }
 681                 /* Byteswap MPEG buffer */
 682                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 683                         ivtv_buf_swap(buf);
 684                 ivtv_enqueue(s, buf, &s->q_full);
 685         }
 686
 687         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 688                 if (s->q_full.length >= itv->dma_data_req_size) {
 689                         int got_sig;
 690
 691                         if (mode == OUT_YUV)
 692                                 ivtv_yuv_setup_stream_frame(itv);
 693
 694                         mutex_unlock(&itv->serialize_lock);
 695                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 696                         while (!(got_sig = signal_pending(current)) &&
 697                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 698                                 schedule();
 699                         }
 700                         finish_wait(&itv->dma_waitq, &wait);
 701                         mutex_lock(&itv->serialize_lock);
 702                         if (got_sig) {
 703                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 704                                 return -EINTR;
 705                         }
 706
 707                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 708                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 709                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 710                 }
 711         }
 712         /* more user data is available, wait until buffers become free
 713            to transfer the rest. */
 714         if (count && !(filp->f_flags & O_NONBLOCK))
 715                 goto retry;
 716         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 717         return bytes_written;
 718 }
 719
 720 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 721 {
 722         struct ivtv_open_id *id = fh2id(filp->private_data);
 723         struct ivtv *itv = id->itv;
 724         ssize_t res;
 725
 726         if (mutex_lock_interruptible(&itv->serialize_lock))
 727                 return -ERESTARTSYS;
 728         res = ivtv_write(filp, user_buf, count, pos);
 729         mutex_unlock(&itv->serialize_lock);
 730         return res;
 731 }
 732
 733 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 734 {
 735         struct ivtv_open_id *id = fh2id(filp->private_data);
 736         struct ivtv *itv = id->itv;
 737         struct ivtv_stream *s = &itv->streams[id->type];
 738         int res = 0;
 739
 740         /* add stream's waitq to the poll list */
 741         IVTV_DEBUG_HI_FILE("Decoder poll\n");
 742
 743         /* If there are subscribed events, then only use the new event
 744            API instead of the old video.h based API. */
 745         if (!list_empty(&id->fh.subscribed)) {
 746                 poll_wait(filp, &id->fh.wait, wait);
 747                 /* Turn off the old-style vsync events */
 748                 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 749                 if (v4l2_event_pending(&id->fh))
 750                         res = POLLPRI;
 751         } else {
 752                 /* This is the old-style API which is here only for backwards
 753                    compatibility. */
 754                 poll_wait(filp, &s->waitq, wait);
 755                 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 756                 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 757                     test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 758                         res = POLLPRI;
 759         }
 760
 761         /* Allow write if buffers are available for writing */
 762         if (s->q_free.buffers)
 763                 res |= POLLOUT | POLLWRNORM;
 764         return res;
 765 }
 766
 767 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
 768 {
 769         unsigned long req_events = poll_requested_events(wait);
 770         struct ivtv_open_id *id = fh2id(filp->private_data);
 771         struct ivtv *itv = id->itv;
 772         struct ivtv_stream *s = &itv->streams[id->type];
 773         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 774         unsigned res = 0;
 775
 776         /* Start a capture if there is none */
 777         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
 778                         s->type != IVTV_ENC_STREAM_TYPE_RAD &&
 779                         (req_events & (POLLIN | POLLRDNORM))) {
 780                 int rc;
 781
 782                 mutex_lock(&itv->serialize_lock);
 783                 rc = ivtv_start_capture(id);
 784                 mutex_unlock(&itv->serialize_lock);
 785                 if (rc) {
 786                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 787                                         s->name, rc);
 788                         return POLLERR;
 789                 }
 790                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 791         }
 792
 793         /* add stream's waitq to the poll list */
 794         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 795         poll_wait(filp, &s->waitq, wait);
 796         if (v4l2_event_pending(&id->fh))
 797                 res |= POLLPRI;
 798         else
 799                 poll_wait(filp, &id->fh.wait, wait);
 800
 801         if (s->q_full.length || s->q_io.length)
 802                 return res | POLLIN | POLLRDNORM;
 803         if (eof)
 804                 return res | POLLHUP;
 805         return res;
 806 }
 807
 808 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 809 {
 810         struct ivtv *itv = id->itv;
 811         struct ivtv_stream *s = &itv->streams[id->type];
 812
 813         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 814
 815         /* 'Unclaim' this stream */
 816
 817         /* Stop capturing */
 818         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 819                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 820
 821                 IVTV_DEBUG_INFO("close stopping capture\n");
 822                 /* Special case: a running VBI capture for VBI insertion
 823                    in the mpeg stream. Need to stop that too. */
 824                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 825                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 826                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 827                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 828                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 829                 }
 830                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 831                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 832                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 833                         /* Also used internally, don't stop capturing */
 834                         s->fh = NULL;
 835                 }
 836                 else {
 837                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 838                 }
 839         }
 840         if (!gop_end) {
 841                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 842                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 843                 ivtv_release_stream(s);
 844         }
 845 }
 846
 847 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 848 {
 849         struct ivtv *itv = id->itv;
 850         struct ivtv_stream *s = &itv->streams[id->type];
 851
 852         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 853
 854         if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
 855                 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 856                 /* Restore registers we've changed & clean up any mess */
 857                 ivtv_yuv_close(itv);
 858         }
 859
 860         /* Stop decoding */
 861         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 862                 IVTV_DEBUG_INFO("close stopping decode\n");
 863
 864                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 865                 itv->output_mode = OUT_NONE;
 866         }
 867         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 868         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 869
 870         if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 871                 itv->output_mode = OUT_NONE;
 872
 873         itv->speed = 0;
 874         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 875         ivtv_release_stream(s);
 876 }
 877
 878 int ivtv_v4l2_close(struct file *filp)
 879 {
 880         struct v4l2_fh *fh = filp->private_data;
 881         struct ivtv_open_id *id = fh2id(fh);
 882         struct ivtv *itv = id->itv;
 883         struct ivtv_stream *s = &itv->streams[id->type];
 884
 885         IVTV_DEBUG_FILE("close %s\n", s->name);
 886
 887         mutex_lock(&itv->serialize_lock);
 888
 889         /* Stop radio */
 890         if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
 891                         v4l2_fh_is_singular_file(filp)) {
 892                 /* Closing radio device, return to TV mode */
 893                 ivtv_mute(itv);
 894                 /* Mark that the radio is no longer in use */
 895                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 896                 /* Switch tuner to TV */
 897                 ivtv_call_all(itv, video, s_std, itv->std);
 898                 /* Select correct audio input (i.e. TV tuner or Line in) */
 899                 ivtv_audio_set_io(itv);
 900                 if (itv->hw_flags & IVTV_HW_SAA711X) {
 901                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 902                                         SAA7115_FREQ_32_11_MHZ, 0);
 903                 }
 904                 if (atomic_read(&itv->capturing) > 0) {
 905                         /* Undo video mute */
 906                         ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
 907                                         v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
 908                                         (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
 909                 }
 910                 /* Done! Unmute and continue. */
 911                 ivtv_unmute(itv);
 912         }
 913
 914         v4l2_fh_del(fh);
 915         v4l2_fh_exit(fh);
 916
 917         /* Easy case first: this stream was never claimed by us */
 918         if (s->fh != &id->fh)
 919                 goto close_done;
 920
 921         /* 'Unclaim' this stream */
 922
 923         if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 924                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 925
 926                 ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
 927
 928                 /* If all output streams are closed, and if the user doesn't have
 929                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
 930                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 931                         /* disable CC on TV-out */
 932                         ivtv_disable_cc(itv);
 933                 }
 934         } else {
 935                 ivtv_stop_capture(id, 0);
 936         }
 937 close_done:
 938         kfree(id);
 939         mutex_unlock(&itv->serialize_lock);
 940         return 0;
 941 }
 942
 943 static int ivtv_open(struct file *filp)
 944 {
 945         struct video_device *vdev = video_devdata(filp);
 946         struct ivtv_stream *s = video_get_drvdata(vdev);
 947         struct ivtv *itv = s->itv;
 948         struct ivtv_open_id *item;
 949         int res = 0;
 950
 951         IVTV_DEBUG_FILE("open %s\n", s->name);
 952
 953         if (ivtv_init_on_first_open(itv)) {
 954                 IVTV_ERR("Failed to initialize on device %s\n",
 955                          video_device_node_name(vdev));
 956                 return -ENXIO;
 957         }
 958
 959 #ifdef CONFIG_VIDEO_ADV_DEBUG
 960         /* Unless ivtv_fw_debug is set, error out if firmware dead. */
 961         if (ivtv_fw_debug) {
 962                 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
 963                           video_device_node_name(vdev));
 964                 IVTV_WARN("Selected firmware errors will be ignored\n");
 965         } else {
 966 #else
 967         if (1) {
 968 #endif
 969                 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 970                 if (res == -EAGAIN)
 971                         res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 972                 if (res < 0)
 973                         return -EIO;
 974         }
 975
 976         if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 977                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 978                 return -EBUSY;
 979
 980         if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 981                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 982                 return -EBUSY;
 983
 984         if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 985                 if (read_reg(0x82c) == 0) {
 986                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 987                         /* return -ENODEV; */
 988                 }
 989                 ivtv_udma_alloc(itv);
 990         }
 991
 992         /* Allocate memory */
 993         item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 994         if (NULL == item) {
 995                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 996                 return -ENOMEM;
 997         }
 998         v4l2_fh_init(&item->fh, &s->vdev);
 999         item->itv = itv;
1000         item->type = s->type;
1001
1002         filp->private_data = &item->fh;
1003         v4l2_fh_add(&item->fh);
1004
1005         if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
1006                         v4l2_fh_is_singular_file(filp)) {
1007                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
1008                         if (atomic_read(&itv->capturing) > 0) {
1009                                 /* switching to radio while capture is
1010                                    in progress is not polite */
1011                                 v4l2_fh_del(&item->fh);
1012                                 v4l2_fh_exit(&item->fh);
1013                                 kfree(item);
1014                                 return -EBUSY;
1015                         }
1016                 }
1017                 /* Mark that the radio is being used. */
1018                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1019                 /* We have the radio */
1020                 ivtv_mute(itv);
1021                 /* Switch tuner to radio */
1022                 ivtv_call_all(itv, tuner, s_radio);
1023                 /* Select the correct audio input (i.e. radio tuner) */
1024                 ivtv_audio_set_io(itv);
1025                 if (itv->hw_flags & IVTV_HW_SAA711X) {
1026                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1027                                 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1028                 }
1029                 /* Done! Unmute and continue. */
1030                 ivtv_unmute(itv);
1031         }
1032
1033         /* YUV or MPG Decoding Mode? */
1034         if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1035                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1036         } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1037                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1038                 /* For yuv, we need to know the dma size before we start */
1039                 itv->dma_data_req_size =
1040                                 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1041                 itv->yuv_info.stream_size = 0;
1042         }
1043         return 0;
1044 }
1045
1046 int ivtv_v4l2_open(struct file *filp)
1047 {
1048         struct video_device *vdev = video_devdata(filp);
1049         int res;
1050
1051         if (mutex_lock_interruptible(vdev->lock))
1052                 return -ERESTARTSYS;
1053         res = ivtv_open(filp);
1054         mutex_unlock(vdev->lock);
1055         return res;
1056 }
1057
1058 void ivtv_mute(struct ivtv *itv)
1059 {
1060         if (atomic_read(&itv->capturing))
1061                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1062         IVTV_DEBUG_INFO("Mute\n");
1063 }
1064
1065 void ivtv_unmute(struct ivtv *itv)
1066 {
1067         if (atomic_read(&itv->capturing)) {
1068                 ivtv_msleep_timeout(100, 0);
1069                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1070                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1071         }
1072         IVTV_DEBUG_INFO("Unmute\n");
1073 }