drivers/media/video/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 static 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->id == id->open_id) {
  54                         /* yes, this file descriptor did. So that's OK. */
  55                         return 0;
  56                 }
  57                 if (s->id == -1 && (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->id = id->open_id;
  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->id = id->open_id;
  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
 100 /* This function releases a previously claimed stream. It will take into
 101    account associated VBI streams. */
 102 void ivtv_release_stream(struct ivtv_stream *s)
 103 {
 104         struct ivtv *itv = s->itv;
 105         struct ivtv_stream *s_vbi;
 106
 107         s->id = -1;
 108         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 109                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 110                 /* this stream is still in use internally */
 111                 return;
 112         }
 113         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 114                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 115                 return;
 116         }
 117
 118         ivtv_flush_queues(s);
 119
 120         /* disable reinsertion interrupt */
 121         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 122                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 123
 124         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 125            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 126            for all other streams we're done */
 127         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 128                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 129         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 130                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 131         else
 132                 return;
 133
 134         /* clear internal use flag */
 135         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 136                 /* was already cleared */
 137                 return;
 138         }
 139         if (s_vbi->id != -1) {
 140                 /* VBI stream still claimed by a file descriptor */
 141                 return;
 142         }
 143         /* disable reinsertion interrupt */
 144         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 145                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 146         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 147         ivtv_flush_queues(s_vbi);
 148 }
 149
 150 static void ivtv_dualwatch(struct ivtv *itv)
 151 {
 152         struct v4l2_tuner vt;
 153         u32 new_bitmap;
 154         u32 new_stereo_mode;
 155         const u32 stereo_mask = 0x0300;
 156         const u32 dual = 0x0200;
 157
 158         new_stereo_mode = itv->params.audio_properties & stereo_mask;
 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         new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
 168
 169         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 170                            itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 171
 172         if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
 173                 itv->dualwatch_stereo_mode = new_stereo_mode;
 174                 return;
 175         }
 176         IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 177 }
 178
 179 static void ivtv_update_pgm_info(struct ivtv *itv)
 180 {
 181         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 182         int cnt;
 183         int i = 0;
 184
 185         if (wr_idx >= itv->pgm_info_num) {
 186                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 187                 return;
 188         }
 189         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 190         while (i < cnt) {
 191                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 192                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 193                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 194                 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 195                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 196                                         // 1=I, 2=P, 4=B
 197
 198                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 199                 if (e->offset > itv->mpg_data_received) {
 200                         break;
 201                 }
 202                 e->offset += itv->vbi_data_inserted;
 203                 e->length = read_enc(addr);
 204                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 205                 e->flags = mapping[read_enc(addr + 12) & 7];
 206                 i++;
 207         }
 208         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 209 }
 210
 211 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 212 {
 213         struct ivtv *itv = s->itv;
 214         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 215         struct ivtv_buffer *buf;
 216         DEFINE_WAIT(wait);
 217
 218         *err = 0;
 219         while (1) {
 220                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 221                         /* Process pending program info updates and pending VBI data */
 222                         ivtv_update_pgm_info(itv);
 223
 224                         if (time_after(jiffies,
 225                                        itv->dualwatch_jiffies +
 226                                        msecs_to_jiffies(1000))) {
 227                                 itv->dualwatch_jiffies = jiffies;
 228                                 ivtv_dualwatch(itv);
 229                         }
 230
 231                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 232                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 233                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 234                                         /* byteswap and process VBI data */
 235                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 236                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 237                                 }
 238                         }
 239                         buf = &itv->vbi.sliced_mpeg_buf;
 240                         if (buf->readpos != buf->bytesused) {
 241                                 return buf;
 242                         }
 243                 }
 244
 245                 /* do we have leftover data? */
 246                 buf = ivtv_dequeue(s, &s->q_io);
 247                 if (buf)
 248                         return buf;
 249
 250                 /* do we have new data? */
 251                 buf = ivtv_dequeue(s, &s->q_full);
 252                 if (buf) {
 253                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 254                                 return buf;
 255                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 256                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 257                                 /* byteswap MPG data */
 258                                 ivtv_buf_swap(buf);
 259                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 260                                 /* byteswap and process VBI data */
 261                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 262                         }
 263                         return buf;
 264                 }
 265
 266                 /* return if end of stream */
 267                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 268                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 269                         return NULL;
 270                 }
 271
 272                 /* return if file was opened with O_NONBLOCK */
 273                 if (non_block) {
 274                         *err = -EAGAIN;
 275                         return NULL;
 276                 }
 277
 278                 /* wait for more data to arrive */
 279                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 280                 /* New buffers might have become available before we were added to the waitqueue */
 281                 if (!s->q_full.buffers)
 282                         schedule();
 283                 finish_wait(&s->waitq, &wait);
 284                 if (signal_pending(current)) {
 285                         /* return if a signal was received */
 286                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 287                         *err = -EINTR;
 288                         return NULL;
 289                 }
 290         }
 291 }
 292
 293 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 294 {
 295         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 296
 297         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 298         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 299         itv->vbi.sliced_mpeg_buf.readpos = 0;
 300 }
 301
 302 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 303                 char __user *ubuf, size_t ucount)
 304 {
 305         struct ivtv *itv = s->itv;
 306         size_t len = buf->bytesused - buf->readpos;
 307
 308         if (len > ucount) len = ucount;
 309         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 310             !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
 311                 const char *start = buf->buf + buf->readpos;
 312                 const char *p = start + 1;
 313                 const u8 *q;
 314                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 315                 int stuffing, i;
 316
 317                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 318                         p = q + 1;
 319                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 320                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 321                                 continue;
 322                         }
 323                         if (!itv->search_pack_header) {
 324                                 if ((q[6] & 0xc0) != 0x80)
 325                                         continue;
 326                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 327                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 328                                         ch = 0xba;
 329                                         itv->search_pack_header = 1;
 330                                         p = q + 9;
 331                                 }
 332                                 continue;
 333                         }
 334                         stuffing = q[13] & 7;
 335                         /* all stuffing bytes must be 0xff */
 336                         for (i = 0; i < stuffing; i++)
 337                                 if (q[14 + i] != 0xff)
 338                                         break;
 339                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 340                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 341                                         q[16 + stuffing] == 1) {
 342                                 itv->search_pack_header = 0;
 343                                 len = (char *)q - start;
 344                                 ivtv_setup_sliced_vbi_buf(itv);
 345                                 break;
 346                         }
 347                 }
 348         }
 349         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 350                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 351                 return -EFAULT;
 352         }
 353         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 354                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 355                         buf == &itv->vbi.sliced_mpeg_buf); */
 356         buf->readpos += len;
 357         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 358                 itv->mpg_data_received += len;
 359         return len;
 360 }
 361
 362 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 363 {
 364         struct ivtv *itv = s->itv;
 365         size_t tot_written = 0;
 366         int single_frame = 0;
 367
 368         if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
 369                 /* shouldn't happen */
 370                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 371                 return -EIO;
 372         }
 373
 374         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 375            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 376         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 377             (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
 378                 single_frame = 1;
 379
 380         for (;;) {
 381                 struct ivtv_buffer *buf;
 382                 int rc;
 383
 384                 buf = ivtv_get_buffer(s, non_block, &rc);
 385                 /* if there is no data available... */
 386                 if (buf == NULL) {
 387                         /* if we got data, then return that regardless */
 388                         if (tot_written)
 389                                 break;
 390                         /* EOS condition */
 391                         if (rc == 0) {
 392                                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 393                                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 394                                 ivtv_release_stream(s);
 395                         }
 396                         /* set errno */
 397                         return rc;
 398                 }
 399                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 400                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 401                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 402                 }
 403                 else if (buf->readpos == buf->bytesused) {
 404                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 405                         itv->vbi.sliced_mpeg_size[idx] = 0;
 406                         itv->vbi.inserted_frame++;
 407                         itv->vbi_data_inserted += buf->bytesused;
 408                 }
 409                 if (rc < 0)
 410                         return rc;
 411                 tot_written += rc;
 412
 413                 if (tot_written == tot_count || single_frame)
 414                         break;
 415         }
 416         return tot_written;
 417 }
 418
 419 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 420                         loff_t *pos, int non_block)
 421 {
 422         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 423         struct ivtv *itv = s->itv;
 424
 425         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 426         if (rc > 0)
 427                 pos += rc;
 428         return rc;
 429 }
 430
 431 int ivtv_start_capture(struct ivtv_open_id *id)
 432 {
 433         struct ivtv *itv = id->itv;
 434         struct ivtv_stream *s = &itv->streams[id->type];
 435         struct ivtv_stream *s_vbi;
 436
 437         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 438             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 439             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 440             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 441                 /* you cannot read from these stream types. */
 442                 return -EPERM;
 443         }
 444
 445         /* Try to claim this stream. */
 446         if (ivtv_claim_stream(id, s->type))
 447                 return -EBUSY;
 448
 449         /* This stream does not need to start capturing */
 450         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 451                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 452                 return 0;
 453         }
 454
 455         /* If capture is already in progress, then we also have to
 456            do nothing extra. */
 457         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 458                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 459                 return 0;
 460         }
 461
 462         /* Start VBI capture if required */
 463         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 464         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 465             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 466             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 467                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 468                    automatically when the MPG stream is claimed.
 469                    We only need to start the VBI capturing. */
 470                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 471                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 472
 473                         /* Failure, clean up and return an error */
 474                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 475                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 476                         /* also releases the associated VBI stream */
 477                         ivtv_release_stream(s);
 478                         return -EIO;
 479                 }
 480                 IVTV_DEBUG_INFO("VBI insertion started\n");
 481         }
 482
 483         /* Tell the card to start capturing */
 484         if (!ivtv_start_v4l2_encode_stream(s)) {
 485                 /* We're done */
 486                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 487                 /* Resume a possibly paused encoder */
 488                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 489                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 490                 return 0;
 491         }
 492
 493         /* failure, clean up */
 494         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 495
 496         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 497            automatically when the MPG stream is released.
 498            We only need to stop the VBI capturing. */
 499         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 500             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 501                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 502                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 503         }
 504         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 505         ivtv_release_stream(s);
 506         return -EIO;
 507 }
 508
 509 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 510 {
 511         struct ivtv_open_id *id = fh2id(filp->private_data);
 512         struct ivtv *itv = id->itv;
 513         struct ivtv_stream *s = &itv->streams[id->type];
 514         int rc;
 515
 516         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 517
 518         mutex_lock(&itv->serialize_lock);
 519         rc = ivtv_start_capture(id);
 520         mutex_unlock(&itv->serialize_lock);
 521         if (rc)
 522                 return rc;
 523         return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 524 }
 525
 526 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 527 {
 528         struct ivtv *itv = id->itv;
 529         struct ivtv_stream *s = &itv->streams[id->type];
 530         int rc;
 531
 532         if (atomic_read(&itv->decoding) == 0) {
 533                 if (ivtv_claim_stream(id, s->type)) {
 534                         /* someone else is using this stream already */
 535                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 536                         return -EBUSY;
 537                 }
 538                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 539                 if (rc < 0) {
 540                         if (rc == -EAGAIN)
 541                                 rc = ivtv_start_v4l2_decode_stream(s, 0);
 542                         if (rc < 0)
 543                                 return rc;
 544                 }
 545         }
 546         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 547                 return ivtv_set_speed(itv, speed);
 548         return 0;
 549 }
 550
 551 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 552 {
 553         struct ivtv_open_id *id = fh2id(filp->private_data);
 554         struct ivtv *itv = id->itv;
 555         struct ivtv_stream *s = &itv->streams[id->type];
 556         struct yuv_playback_info *yi = &itv->yuv_info;
 557         struct ivtv_buffer *buf;
 558         struct ivtv_queue q;
 559         int bytes_written = 0;
 560         int mode;
 561         int rc;
 562         DEFINE_WAIT(wait);
 563
 564         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 565
 566         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 567             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 568             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 569                 /* not decoder streams */
 570                 return -EPERM;
 571
 572         /* Try to claim this stream */
 573         if (ivtv_claim_stream(id, s->type))
 574                 return -EBUSY;
 575
 576         /* This stream does not need to start any decoding */
 577         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 578                 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
 579
 580                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 581                 ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
 582                 return elems * sizeof(struct v4l2_sliced_vbi_data);
 583         }
 584
 585         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 586
 587         if (ivtv_set_output_mode(itv, mode) != mode) {
 588             ivtv_release_stream(s);
 589             return -EBUSY;
 590         }
 591         ivtv_queue_init(&q);
 592         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 593
 594         /* Start decoder (returns 0 if already started) */
 595         mutex_lock(&itv->serialize_lock);
 596         rc = ivtv_start_decoding(id, itv->speed);
 597         mutex_unlock(&itv->serialize_lock);
 598         if (rc) {
 599                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 600
 601                 /* failure, clean up */
 602                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 603                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 604                 return rc;
 605         }
 606
 607 retry:
 608         /* If possible, just DMA the entire frame - Check the data transfer size
 609         since we may get here before the stream has been fully set-up */
 610         if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
 611                 while (count >= itv->dma_data_req_size) {
 612                         rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
 613
 614                         if (rc < 0)
 615                                 return rc;
 616
 617                         bytes_written += itv->dma_data_req_size;
 618                         user_buf += itv->dma_data_req_size;
 619                         count -= itv->dma_data_req_size;
 620                 }
 621                 if (count == 0) {
 622                         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 623                         return bytes_written;
 624                 }
 625         }
 626
 627         for (;;) {
 628                 /* Gather buffers */
 629                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 630                         ivtv_enqueue(s, buf, &q);
 631                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 632                         ivtv_enqueue(s, buf, &q);
 633                 }
 634                 if (q.buffers)
 635                         break;
 636                 if (filp->f_flags & O_NONBLOCK)
 637                         return -EAGAIN;
 638                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 639                 /* New buffers might have become free before we were added to the waitqueue */
 640                 if (!s->q_free.buffers)
 641                         schedule();
 642                 finish_wait(&s->waitq, &wait);
 643                 if (signal_pending(current)) {
 644                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 645                         return -EINTR;
 646                 }
 647         }
 648
 649         /* copy user data into buffers */
 650         while ((buf = ivtv_dequeue(s, &q))) {
 651                 /* yuv is a pain. Don't copy more data than needed for a single
 652                    frame, otherwise we lose sync with the incoming stream */
 653                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 654                     yi->stream_size + count > itv->dma_data_req_size)
 655                         rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
 656                                 itv->dma_data_req_size - yi->stream_size);
 657                 else
 658                         rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 659
 660                 /* Make sure we really got all the user data */
 661                 if (rc < 0) {
 662                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 663                         return rc;
 664                 }
 665                 user_buf += rc;
 666                 count -= rc;
 667                 bytes_written += rc;
 668
 669                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 670                         yi->stream_size += rc;
 671                         /* If we have a complete yuv frame, break loop now */
 672                         if (yi->stream_size == itv->dma_data_req_size) {
 673                                 ivtv_enqueue(s, buf, &s->q_full);
 674                                 yi->stream_size = 0;
 675                                 break;
 676                         }
 677                 }
 678
 679                 if (buf->bytesused != s->buf_size) {
 680                         /* incomplete, leave in q_io for next time */
 681                         ivtv_enqueue(s, buf, &s->q_io);
 682                         break;
 683                 }
 684                 /* Byteswap MPEG buffer */
 685                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 686                         ivtv_buf_swap(buf);
 687                 ivtv_enqueue(s, buf, &s->q_full);
 688         }
 689
 690         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 691                 if (s->q_full.length >= itv->dma_data_req_size) {
 692                         int got_sig;
 693
 694                         if (mode == OUT_YUV)
 695                                 ivtv_yuv_setup_stream_frame(itv);
 696
 697                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 698                         while (!(got_sig = signal_pending(current)) &&
 699                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 700                                 schedule();
 701                         }
 702                         finish_wait(&itv->dma_waitq, &wait);
 703                         if (got_sig) {
 704                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 705                                 return -EINTR;
 706                         }
 707
 708                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 709                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 710                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 711                 }
 712         }
 713         /* more user data is available, wait until buffers become free
 714            to transfer the rest. */
 715         if (count && !(filp->f_flags & O_NONBLOCK))
 716                 goto retry;
 717         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 718         return bytes_written;
 719 }
 720
 721 unsigned int 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         int 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.events->subscribed)) {
 734                 poll_wait(filp, &id->fh.events->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 = POLLPRI;
 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 = POLLPRI;
 747         }
 748
 749         /* Allow write if buffers are available for writing */
 750         if (s->q_free.buffers)
 751                 res |= POLLOUT | POLLWRNORM;
 752         return res;
 753 }
 754
 755 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 756 {
 757         struct ivtv_open_id *id = fh2id(filp->private_data);
 758         struct ivtv *itv = id->itv;
 759         struct ivtv_stream *s = &itv->streams[id->type];
 760         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 761
 762         /* Start a capture if there is none */
 763         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 764                 int rc;
 765
 766                 mutex_lock(&itv->serialize_lock);
 767                 rc = ivtv_start_capture(id);
 768                 mutex_unlock(&itv->serialize_lock);
 769                 if (rc) {
 770                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 771                                         s->name, rc);
 772                         return POLLERR;
 773                 }
 774                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 775         }
 776
 777         /* add stream's waitq to the poll list */
 778         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 779         poll_wait(filp, &s->waitq, wait);
 780
 781         if (s->q_full.length || s->q_io.length)
 782                 return POLLIN | POLLRDNORM;
 783         if (eof)
 784                 return POLLHUP;
 785         return 0;
 786 }
 787
 788 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 789 {
 790         struct ivtv *itv = id->itv;
 791         struct ivtv_stream *s = &itv->streams[id->type];
 792
 793         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 794
 795         /* 'Unclaim' this stream */
 796
 797         /* Stop capturing */
 798         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 799                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 800
 801                 IVTV_DEBUG_INFO("close stopping capture\n");
 802                 /* Special case: a running VBI capture for VBI insertion
 803                    in the mpeg stream. Need to stop that too. */
 804                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 805                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 806                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 807                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 808                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 809                 }
 810                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 811                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 812                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 813                         /* Also used internally, don't stop capturing */
 814                         s->id = -1;
 815                 }
 816                 else {
 817                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 818                 }
 819         }
 820         if (!gop_end) {
 821                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 822                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 823                 ivtv_release_stream(s);
 824         }
 825 }
 826
 827 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 828 {
 829         struct ivtv *itv = id->itv;
 830         struct ivtv_stream *s = &itv->streams[id->type];
 831
 832         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 833
 834         if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
 835                 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 836                 /* Restore registers we've changed & clean up any mess */
 837                 ivtv_yuv_close(itv);
 838         }
 839
 840         /* Stop decoding */
 841         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 842                 IVTV_DEBUG_INFO("close stopping decode\n");
 843
 844                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 845                 itv->output_mode = OUT_NONE;
 846         }
 847         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 848         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 849
 850         if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 851                 itv->output_mode = OUT_NONE;
 852
 853         itv->speed = 0;
 854         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 855         ivtv_release_stream(s);
 856 }
 857
 858 int ivtv_v4l2_close(struct file *filp)
 859 {
 860         struct v4l2_fh *fh = filp->private_data;
 861         struct ivtv_open_id *id = fh2id(fh);
 862         struct ivtv *itv = id->itv;
 863         struct ivtv_stream *s = &itv->streams[id->type];
 864
 865         IVTV_DEBUG_FILE("close %s\n", s->name);
 866
 867         v4l2_prio_close(&itv->prio, id->prio);
 868         v4l2_fh_del(fh);
 869         v4l2_fh_exit(fh);
 870
 871         /* Easy case first: this stream was never claimed by us */
 872         if (s->id != id->open_id) {
 873                 kfree(id);
 874                 return 0;
 875         }
 876
 877         /* 'Unclaim' this stream */
 878
 879         /* Stop radio */
 880         mutex_lock(&itv->serialize_lock);
 881         if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
 882                 /* Closing radio device, return to TV mode */
 883                 ivtv_mute(itv);
 884                 /* Mark that the radio is no longer in use */
 885                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 886                 /* Switch tuner to TV */
 887                 ivtv_call_all(itv, core, s_std, itv->std);
 888                 /* Select correct audio input (i.e. TV tuner or Line in) */
 889                 ivtv_audio_set_io(itv);
 890                 if (itv->hw_flags & IVTV_HW_SAA711X) {
 891                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 892                                         SAA7115_FREQ_32_11_MHZ, 0);
 893                 }
 894                 if (atomic_read(&itv->capturing) > 0) {
 895                         /* Undo video mute */
 896                         ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
 897                                 itv->params.video_mute | (itv->params.video_mute_yuv << 8));
 898                 }
 899                 /* Done! Unmute and continue. */
 900                 ivtv_unmute(itv);
 901                 ivtv_release_stream(s);
 902         } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 903                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 904
 905                 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
 906
 907                 /* If all output streams are closed, and if the user doesn't have
 908                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
 909                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 910                         /* disable CC on TV-out */
 911                         ivtv_disable_cc(itv);
 912                 }
 913         } else {
 914                 ivtv_stop_capture(id, 0);
 915         }
 916         kfree(id);
 917         mutex_unlock(&itv->serialize_lock);
 918         return 0;
 919 }
 920
 921 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
 922 {
 923 #ifdef CONFIG_VIDEO_ADV_DEBUG
 924         struct video_device *vdev = video_devdata(filp);
 925 #endif
 926         struct ivtv *itv = s->itv;
 927         struct ivtv_open_id *item;
 928         int res = 0;
 929
 930         IVTV_DEBUG_FILE("open %s\n", s->name);
 931
 932 #ifdef CONFIG_VIDEO_ADV_DEBUG
 933         /* Unless ivtv_fw_debug is set, error out if firmware dead. */
 934         if (ivtv_fw_debug) {
 935                 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
 936                           video_device_node_name(vdev));
 937                 IVTV_WARN("Selected firmware errors will be ignored\n");
 938         } else {
 939 #else
 940         if (1) {
 941 #endif
 942                 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 943                 if (res == -EAGAIN)
 944                         res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 945                 if (res < 0)
 946                         return -EIO;
 947         }
 948
 949         if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 950                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 951                 return -EBUSY;
 952
 953         if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 954                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 955                 return -EBUSY;
 956
 957         if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 958                 if (read_reg(0x82c) == 0) {
 959                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 960                         /* return -ENODEV; */
 961                 }
 962                 ivtv_udma_alloc(itv);
 963         }
 964
 965         /* Allocate memory */
 966         item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 967         if (NULL == item) {
 968                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 969                 return -ENOMEM;
 970         }
 971         v4l2_fh_init(&item->fh, s->vdev);
 972         if (s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 973             s->type == IVTV_DEC_STREAM_TYPE_MPG) {
 974                 res = v4l2_event_alloc(&item->fh, 60);
 975         }
 976         if (res < 0) {
 977                 v4l2_fh_exit(&item->fh);
 978                 kfree(item);
 979                 return res;
 980         }
 981         item->itv = itv;
 982         item->type = s->type;
 983         v4l2_prio_open(&itv->prio, &item->prio);
 984
 985         item->open_id = itv->open_id++;
 986         filp->private_data = &item->fh;
 987
 988         if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
 989                 /* Try to claim this stream */
 990                 if (ivtv_claim_stream(item, item->type)) {
 991                         /* No, it's already in use */
 992                         kfree(item);
 993                         return -EBUSY;
 994                 }
 995
 996                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
 997                         if (atomic_read(&itv->capturing) > 0) {
 998                                 /* switching to radio while capture is
 999                                    in progress is not polite */
1000                                 ivtv_release_stream(s);
1001                                 v4l2_fh_exit(&item->fh);
1002                                 kfree(item);
1003                                 return -EBUSY;
1004                         }
1005                 }
1006                 /* Mark that the radio is being used. */
1007                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1008                 /* We have the radio */
1009                 ivtv_mute(itv);
1010                 /* Switch tuner to radio */
1011                 ivtv_call_all(itv, tuner, s_radio);
1012                 /* Select the correct audio input (i.e. radio tuner) */
1013                 ivtv_audio_set_io(itv);
1014                 if (itv->hw_flags & IVTV_HW_SAA711X) {
1015                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1016                                 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1017                 }
1018                 /* Done! Unmute and continue. */
1019                 ivtv_unmute(itv);
1020         }
1021
1022         /* YUV or MPG Decoding Mode? */
1023         if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1024                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1025         } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1026                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1027                 /* For yuv, we need to know the dma size before we start */
1028                 itv->dma_data_req_size =
1029                                 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1030                 itv->yuv_info.stream_size = 0;
1031         }
1032         v4l2_fh_add(&item->fh);
1033         return 0;
1034 }
1035
1036 int ivtv_v4l2_open(struct file *filp)
1037 {
1038         int res;
1039         struct ivtv *itv = NULL;
1040         struct ivtv_stream *s = NULL;
1041         struct video_device *vdev = video_devdata(filp);
1042
1043         s = video_get_drvdata(vdev);
1044         itv = s->itv;
1045
1046         mutex_lock(&itv->serialize_lock);
1047         if (ivtv_init_on_first_open(itv)) {
1048                 IVTV_ERR("Failed to initialize on device %s\n",
1049                          video_device_node_name(vdev));
1050                 mutex_unlock(&itv->serialize_lock);
1051                 return -ENXIO;
1052         }
1053         res = ivtv_serialized_open(s, filp);
1054         mutex_unlock(&itv->serialize_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 }