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 <media/v4l2-event.h>
  36 #include <media/saa7115.h>
  37
  38 /* This function tries to claim the stream for a specific file descriptor.
  39    If no one else is using this stream then the stream is claimed and
  40    associated VBI streams are also automatically claimed.
  41    Possible error returns: -EBUSY if someone else has claimed
  42    the stream or 0 on success. */
  43 static int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  44 {
  45         struct ivtv *itv = id->itv;
  46         struct ivtv_stream *s = &itv->streams[type];
  47         struct ivtv_stream *s_vbi;
  48         int vbi_type;
  49
  50         if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
  51                 /* someone already claimed this stream */
  52                 if (s->id == id->open_id) {
  53                         /* yes, this file descriptor did. So that's OK. */
  54                         return 0;
  55                 }
  56                 if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
  57                                          type == IVTV_ENC_STREAM_TYPE_VBI)) {
  58                         /* VBI is handled already internally, now also assign
  59                            the file descriptor to this stream for external
  60                            reading of the stream. */
  61                         s->id = id->open_id;
  62                         IVTV_DEBUG_INFO("Start Read VBI\n");
  63                         return 0;
  64                 }
  65                 /* someone else is using this stream already */
  66                 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  67                 return -EBUSY;
  68         }
  69         s->id = id->open_id;
  70         if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  71                 /* Enable reinsertion interrupt */
  72                 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  73         }
  74
  75         /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  76            IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  77            (provided VBI insertion is on and sliced VBI is selected), for all
  78            other streams we're done */
  79         if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  80                 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  81         } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  82                    itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
  83                 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  84         } else {
  85                 return 0;
  86         }
  87         s_vbi = &itv->streams[vbi_type];
  88
  89         if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  90                 /* Enable reinsertion interrupt */
  91                 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  92                         ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  93         }
  94         /* mark that it is used internally */
  95         set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  96         return 0;
  97 }
  98
  99 /* This function releases a previously claimed stream. It will take into
 100    account associated VBI streams. */
 101 void ivtv_release_stream(struct ivtv_stream *s)
 102 {
 103         struct ivtv *itv = s->itv;
 104         struct ivtv_stream *s_vbi;
 105
 106         s->id = -1;
 107         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 108                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 109                 /* this stream is still in use internally */
 110                 return;
 111         }
 112         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 113                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 114                 return;
 115         }
 116
 117         ivtv_flush_queues(s);
 118
 119         /* disable reinsertion interrupt */
 120         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 121                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 122
 123         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 124            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 125            for all other streams we're done */
 126         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 127                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 128         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 129                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 130         else
 131                 return;
 132
 133         /* clear internal use flag */
 134         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 135                 /* was already cleared */
 136                 return;
 137         }
 138         if (s_vbi->id != -1) {
 139                 /* VBI stream still claimed by a file descriptor */
 140                 return;
 141         }
 142         /* disable reinsertion interrupt */
 143         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 144                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 145         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 146         ivtv_flush_queues(s_vbi);
 147 }
 148
 149 static void ivtv_dualwatch(struct ivtv *itv)
 150 {
 151         struct v4l2_tuner vt;
 152         u32 new_bitmap;
 153         u32 new_stereo_mode;
 154         const u32 stereo_mask = 0x0300;
 155         const u32 dual = 0x0200;
 156
 157         new_stereo_mode = itv->params.audio_properties & stereo_mask;
 158         memset(&vt, 0, sizeof(vt));
 159         ivtv_call_all(itv, tuner, g_tuner, &vt);
 160         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 161                 new_stereo_mode = dual;
 162
 163         if (new_stereo_mode == itv->dualwatch_stereo_mode)
 164                 return;
 165
 166         new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
 167
 168         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 169                            itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 170
 171         if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
 172                 itv->dualwatch_stereo_mode = new_stereo_mode;
 173                 return;
 174         }
 175         IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 176 }
 177
 178 static void ivtv_update_pgm_info(struct ivtv *itv)
 179 {
 180         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 181         int cnt;
 182         int i = 0;
 183
 184         if (wr_idx >= itv->pgm_info_num) {
 185                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 186                 return;
 187         }
 188         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 189         while (i < cnt) {
 190                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 191                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 192                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 193                 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 194                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 195                                         // 1=I, 2=P, 4=B
 196
 197                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 198                 if (e->offset > itv->mpg_data_received) {
 199                         break;
 200                 }
 201                 e->offset += itv->vbi_data_inserted;
 202                 e->length = read_enc(addr);
 203                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 204                 e->flags = mapping[read_enc(addr + 12) & 7];
 205                 i++;
 206         }
 207         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 208 }
 209
 210 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 211 {
 212         struct ivtv *itv = s->itv;
 213         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 214         struct ivtv_buffer *buf;
 215         DEFINE_WAIT(wait);
 216
 217         *err = 0;
 218         while (1) {
 219                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 220                         /* Process pending program info updates and pending VBI data */
 221                         ivtv_update_pgm_info(itv);
 222
 223                         if (time_after(jiffies,
 224                                        itv->dualwatch_jiffies +
 225                                        msecs_to_jiffies(1000))) {
 226                                 itv->dualwatch_jiffies = jiffies;
 227                                 ivtv_dualwatch(itv);
 228                         }
 229
 230                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 231                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 232                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 233                                         /* byteswap and process VBI data */
 234                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 235                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 236                                 }
 237                         }
 238                         buf = &itv->vbi.sliced_mpeg_buf;
 239                         if (buf->readpos != buf->bytesused) {
 240                                 return buf;
 241                         }
 242                 }
 243
 244                 /* do we have leftover data? */
 245                 buf = ivtv_dequeue(s, &s->q_io);
 246                 if (buf)
 247                         return buf;
 248
 249                 /* do we have new data? */
 250                 buf = ivtv_dequeue(s, &s->q_full);
 251                 if (buf) {
 252                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 253                                 return buf;
 254                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 255                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 256                                 /* byteswap MPG data */
 257                                 ivtv_buf_swap(buf);
 258                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 259                                 /* byteswap and process VBI data */
 260                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 261                         }
 262                         return buf;
 263                 }
 264
 265                 /* return if end of stream */
 266                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 267                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 268                         return NULL;
 269                 }
 270
 271                 /* return if file was opened with O_NONBLOCK */
 272                 if (non_block) {
 273                         *err = -EAGAIN;
 274                         return NULL;
 275                 }
 276
 277                 /* wait for more data to arrive */
 278                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 279                 /* New buffers might have become available before we were added to the waitqueue */
 280                 if (!s->q_full.buffers)
 281                         schedule();
 282                 finish_wait(&s->waitq, &wait);
 283                 if (signal_pending(current)) {
 284                         /* return if a signal was received */
 285                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 286                         *err = -EINTR;
 287                         return NULL;
 288                 }
 289         }
 290 }
 291
 292 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 293 {
 294         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 295
 296         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 297         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 298         itv->vbi.sliced_mpeg_buf.readpos = 0;
 299 }
 300
 301 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 302                 char __user *ubuf, size_t ucount)
 303 {
 304         struct ivtv *itv = s->itv;
 305         size_t len = buf->bytesused - buf->readpos;
 306
 307         if (len > ucount) len = ucount;
 308         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 309             !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
 310                 const char *start = buf->buf + buf->readpos;
 311                 const char *p = start + 1;
 312                 const u8 *q;
 313                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 314                 int stuffing, i;
 315
 316                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 317                         p = q + 1;
 318                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 319                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 320                                 continue;
 321                         }
 322                         if (!itv->search_pack_header) {
 323                                 if ((q[6] & 0xc0) != 0x80)
 324                                         continue;
 325                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 326                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 327                                         ch = 0xba;
 328                                         itv->search_pack_header = 1;
 329                                         p = q + 9;
 330                                 }
 331                                 continue;
 332                         }
 333                         stuffing = q[13] & 7;
 334                         /* all stuffing bytes must be 0xff */
 335                         for (i = 0; i < stuffing; i++)
 336                                 if (q[14 + i] != 0xff)
 337                                         break;
 338                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 339                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 340                                         q[16 + stuffing] == 1) {
 341                                 itv->search_pack_header = 0;
 342                                 len = (char *)q - start;
 343                                 ivtv_setup_sliced_vbi_buf(itv);
 344                                 break;
 345                         }
 346                 }
 347         }
 348         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 349                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 350                 return -EFAULT;
 351         }
 352         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 353                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 354                         buf == &itv->vbi.sliced_mpeg_buf); */
 355         buf->readpos += len;
 356         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 357                 itv->mpg_data_received += len;
 358         return len;
 359 }
 360
 361 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 362 {
 363         struct ivtv *itv = s->itv;
 364         size_t tot_written = 0;
 365         int single_frame = 0;
 366
 367         if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
 368                 /* shouldn't happen */
 369                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 370                 return -EIO;
 371         }
 372
 373         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 374            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 375         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 376             (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
 377                 single_frame = 1;
 378
 379         for (;;) {
 380                 struct ivtv_buffer *buf;
 381                 int rc;
 382
 383                 buf = ivtv_get_buffer(s, non_block, &rc);
 384                 /* if there is no data available... */
 385                 if (buf == NULL) {
 386                         /* if we got data, then return that regardless */
 387                         if (tot_written)
 388                                 break;
 389                         /* EOS condition */
 390                         if (rc == 0) {
 391                                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 392                                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 393                                 ivtv_release_stream(s);
 394                         }
 395                         /* set errno */
 396                         return rc;
 397                 }
 398                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 399                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 400                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 401                 }
 402                 else if (buf->readpos == buf->bytesused) {
 403                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 404                         itv->vbi.sliced_mpeg_size[idx] = 0;
 405                         itv->vbi.inserted_frame++;
 406                         itv->vbi_data_inserted += buf->bytesused;
 407                 }
 408                 if (rc < 0)
 409                         return rc;
 410                 tot_written += rc;
 411
 412                 if (tot_written == tot_count || single_frame)
 413                         break;
 414         }
 415         return tot_written;
 416 }
 417
 418 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 419                         loff_t *pos, int non_block)
 420 {
 421         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 422         struct ivtv *itv = s->itv;
 423
 424         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 425         if (rc > 0)
 426                 pos += rc;
 427         return rc;
 428 }
 429
 430 int ivtv_start_capture(struct ivtv_open_id *id)
 431 {
 432         struct ivtv *itv = id->itv;
 433         struct ivtv_stream *s = &itv->streams[id->type];
 434         struct ivtv_stream *s_vbi;
 435
 436         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 437             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 438             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 439             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 440                 /* you cannot read from these stream types. */
 441                 return -EPERM;
 442         }
 443
 444         /* Try to claim this stream. */
 445         if (ivtv_claim_stream(id, s->type))
 446                 return -EBUSY;
 447
 448         /* This stream does not need to start capturing */
 449         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 450                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 451                 return 0;
 452         }
 453
 454         /* If capture is already in progress, then we also have to
 455            do nothing extra. */
 456         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 457                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 458                 return 0;
 459         }
 460
 461         /* Start VBI capture if required */
 462         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 463         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 464             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 465             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 466                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 467                    automatically when the MPG stream is claimed.
 468                    We only need to start the VBI capturing. */
 469                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 470                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 471
 472                         /* Failure, clean up and return an error */
 473                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 474                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 475                         /* also releases the associated VBI stream */
 476                         ivtv_release_stream(s);
 477                         return -EIO;
 478                 }
 479                 IVTV_DEBUG_INFO("VBI insertion started\n");
 480         }
 481
 482         /* Tell the card to start capturing */
 483         if (!ivtv_start_v4l2_encode_stream(s)) {
 484                 /* We're done */
 485                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 486                 /* Resume a possibly paused encoder */
 487                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 488                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 489                 return 0;
 490         }
 491
 492         /* failure, clean up */
 493         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 494
 495         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 496            automatically when the MPG stream is released.
 497            We only need to stop the VBI capturing. */
 498         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 499             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 500                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 501                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 502         }
 503         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 504         ivtv_release_stream(s);
 505         return -EIO;
 506 }
 507
 508 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 509 {
 510         struct ivtv_open_id *id = fh2id(filp->private_data);
 511         struct ivtv *itv = id->itv;
 512         struct ivtv_stream *s = &itv->streams[id->type];
 513         int rc;
 514
 515         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 516
 517         mutex_lock(&itv->serialize_lock);
 518         rc = ivtv_start_capture(id);
 519         mutex_unlock(&itv->serialize_lock);
 520         if (rc)
 521                 return rc;
 522         return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 523 }
 524
 525 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 526 {
 527         struct ivtv *itv = id->itv;
 528         struct ivtv_stream *s = &itv->streams[id->type];
 529
 530         if (atomic_read(&itv->decoding) == 0) {
 531                 if (ivtv_claim_stream(id, s->type)) {
 532                         /* someone else is using this stream already */
 533                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 534                         return -EBUSY;
 535                 }
 536                 ivtv_start_v4l2_decode_stream(s, 0);
 537         }
 538         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 539                 return ivtv_set_speed(itv, speed);
 540         return 0;
 541 }
 542
 543 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 544 {
 545         struct ivtv_open_id *id = fh2id(filp->private_data);
 546         struct ivtv *itv = id->itv;
 547         struct ivtv_stream *s = &itv->streams[id->type];
 548         struct yuv_playback_info *yi = &itv->yuv_info;
 549         struct ivtv_buffer *buf;
 550         struct ivtv_queue q;
 551         int bytes_written = 0;
 552         int mode;
 553         int rc;
 554         DEFINE_WAIT(wait);
 555
 556         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 557
 558         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 559             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 560             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 561                 /* not decoder streams */
 562                 return -EPERM;
 563
 564         /* Try to claim this stream */
 565         if (ivtv_claim_stream(id, s->type))
 566                 return -EBUSY;
 567
 568         /* This stream does not need to start any decoding */
 569         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 570                 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
 571
 572                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 573                 ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
 574                 return elems * sizeof(struct v4l2_sliced_vbi_data);
 575         }
 576
 577         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 578
 579         if (ivtv_set_output_mode(itv, mode) != mode) {
 580             ivtv_release_stream(s);
 581             return -EBUSY;
 582         }
 583         ivtv_queue_init(&q);
 584         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 585
 586         /* Start decoder (returns 0 if already started) */
 587         mutex_lock(&itv->serialize_lock);
 588         rc = ivtv_start_decoding(id, itv->speed);
 589         mutex_unlock(&itv->serialize_lock);
 590         if (rc) {
 591                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 592
 593                 /* failure, clean up */
 594                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 595                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 596                 return rc;
 597         }
 598
 599 retry:
 600         /* If possible, just DMA the entire frame - Check the data transfer size
 601         since we may get here before the stream has been fully set-up */
 602         if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
 603                 while (count >= itv->dma_data_req_size) {
 604                         rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
 605
 606                         if (rc < 0)
 607                                 return rc;
 608
 609                         bytes_written += itv->dma_data_req_size;
 610                         user_buf += itv->dma_data_req_size;
 611                         count -= itv->dma_data_req_size;
 612                 }
 613                 if (count == 0) {
 614                         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 615                         return bytes_written;
 616                 }
 617         }
 618
 619         for (;;) {
 620                 /* Gather buffers */
 621                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 622                         ivtv_enqueue(s, buf, &q);
 623                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 624                         ivtv_enqueue(s, buf, &q);
 625                 }
 626                 if (q.buffers)
 627                         break;
 628                 if (filp->f_flags & O_NONBLOCK)
 629                         return -EAGAIN;
 630                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 631                 /* New buffers might have become free before we were added to the waitqueue */
 632                 if (!s->q_free.buffers)
 633                         schedule();
 634                 finish_wait(&s->waitq, &wait);
 635                 if (signal_pending(current)) {
 636                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 637                         return -EINTR;
 638                 }
 639         }
 640
 641         /* copy user data into buffers */
 642         while ((buf = ivtv_dequeue(s, &q))) {
 643                 /* yuv is a pain. Don't copy more data than needed for a single
 644                    frame, otherwise we lose sync with the incoming stream */
 645                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 646                     yi->stream_size + count > itv->dma_data_req_size)
 647                         rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
 648                                 itv->dma_data_req_size - yi->stream_size);
 649                 else
 650                         rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 651
 652                 /* Make sure we really got all the user data */
 653                 if (rc < 0) {
 654                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 655                         return rc;
 656                 }
 657                 user_buf += rc;
 658                 count -= rc;
 659                 bytes_written += rc;
 660
 661                 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 662                         yi->stream_size += rc;
 663                         /* If we have a complete yuv frame, break loop now */
 664                         if (yi->stream_size == itv->dma_data_req_size) {
 665                                 ivtv_enqueue(s, buf, &s->q_full);
 666                                 yi->stream_size = 0;
 667                                 break;
 668                         }
 669                 }
 670
 671                 if (buf->bytesused != s->buf_size) {
 672                         /* incomplete, leave in q_io for next time */
 673                         ivtv_enqueue(s, buf, &s->q_io);
 674                         break;
 675                 }
 676                 /* Byteswap MPEG buffer */
 677                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 678                         ivtv_buf_swap(buf);
 679                 ivtv_enqueue(s, buf, &s->q_full);
 680         }
 681
 682         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 683                 if (s->q_full.length >= itv->dma_data_req_size) {
 684                         int got_sig;
 685
 686                         if (mode == OUT_YUV)
 687                                 ivtv_yuv_setup_stream_frame(itv);
 688
 689                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 690                         while (!(got_sig = signal_pending(current)) &&
 691                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 692                                 schedule();
 693                         }
 694                         finish_wait(&itv->dma_waitq, &wait);
 695                         if (got_sig) {
 696                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 697                                 return -EINTR;
 698                         }
 699
 700                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 701                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 702                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 703                 }
 704         }
 705         /* more user data is available, wait until buffers become free
 706            to transfer the rest. */
 707         if (count && !(filp->f_flags & O_NONBLOCK))
 708                 goto retry;
 709         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 710         return bytes_written;
 711 }
 712
 713 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 714 {
 715         struct ivtv_open_id *id = fh2id(filp->private_data);
 716         struct ivtv *itv = id->itv;
 717         struct ivtv_stream *s = &itv->streams[id->type];
 718         int res = 0;
 719
 720         /* add stream's waitq to the poll list */
 721         IVTV_DEBUG_HI_FILE("Decoder poll\n");
 722
 723         /* If there are subscribed events, then only use the new event
 724            API instead of the old video.h based API. */
 725         if (!list_empty(&id->fh.events->subscribed)) {
 726                 poll_wait(filp, &id->fh.events->wait, wait);
 727                 /* Turn off the old-style vsync events */
 728                 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 729                 if (v4l2_event_pending(&id->fh))
 730                         res = POLLPRI;
 731         } else {
 732                 /* This is the old-style API which is here only for backwards
 733                    compatibility. */
 734                 poll_wait(filp, &s->waitq, wait);
 735                 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 736                 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 737                     test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 738                         res = POLLPRI;
 739         }
 740
 741         /* Allow write if buffers are available for writing */
 742         if (s->q_free.buffers)
 743                 res |= POLLOUT | POLLWRNORM;
 744         return res;
 745 }
 746
 747 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 748 {
 749         struct ivtv_open_id *id = fh2id(filp->private_data);
 750         struct ivtv *itv = id->itv;
 751         struct ivtv_stream *s = &itv->streams[id->type];
 752         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 753
 754         /* Start a capture if there is none */
 755         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 756                 int rc;
 757
 758                 mutex_lock(&itv->serialize_lock);
 759                 rc = ivtv_start_capture(id);
 760                 mutex_unlock(&itv->serialize_lock);
 761                 if (rc) {
 762                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 763                                         s->name, rc);
 764                         return POLLERR;
 765                 }
 766                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 767         }
 768
 769         /* add stream's waitq to the poll list */
 770         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 771         poll_wait(filp, &s->waitq, wait);
 772
 773         if (s->q_full.length || s->q_io.length)
 774                 return POLLIN | POLLRDNORM;
 775         if (eof)
 776                 return POLLHUP;
 777         return 0;
 778 }
 779
 780 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 781 {
 782         struct ivtv *itv = id->itv;
 783         struct ivtv_stream *s = &itv->streams[id->type];
 784
 785         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 786
 787         /* 'Unclaim' this stream */
 788
 789         /* Stop capturing */
 790         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 791                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 792
 793                 IVTV_DEBUG_INFO("close stopping capture\n");
 794                 /* Special case: a running VBI capture for VBI insertion
 795                    in the mpeg stream. Need to stop that too. */
 796                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 797                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 798                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 799                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 800                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 801                 }
 802                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 803                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 804                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 805                         /* Also used internally, don't stop capturing */
 806                         s->id = -1;
 807                 }
 808                 else {
 809                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 810                 }
 811         }
 812         if (!gop_end) {
 813                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 814                 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 815                 ivtv_release_stream(s);
 816         }
 817 }
 818
 819 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 820 {
 821         struct ivtv *itv = id->itv;
 822         struct ivtv_stream *s = &itv->streams[id->type];
 823
 824         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 825
 826         if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
 827                 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 828                 /* Restore registers we've changed & clean up any mess */
 829                 ivtv_yuv_close(itv);
 830         }
 831
 832         /* Stop decoding */
 833         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 834                 IVTV_DEBUG_INFO("close stopping decode\n");
 835
 836                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 837                 itv->output_mode = OUT_NONE;
 838         }
 839         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 840         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 841
 842         if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 843                 itv->output_mode = OUT_NONE;
 844
 845         itv->speed = 0;
 846         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 847         ivtv_release_stream(s);
 848 }
 849
 850 int ivtv_v4l2_close(struct file *filp)
 851 {
 852         struct v4l2_fh *fh = filp->private_data;
 853         struct ivtv_open_id *id = fh2id(fh);
 854         struct ivtv *itv = id->itv;
 855         struct ivtv_stream *s = &itv->streams[id->type];
 856
 857         IVTV_DEBUG_FILE("close %s\n", s->name);
 858
 859         v4l2_prio_close(&itv->prio, id->prio);
 860         v4l2_fh_del(fh);
 861         v4l2_fh_exit(fh);
 862
 863         /* Easy case first: this stream was never claimed by us */
 864         if (s->id != id->open_id) {
 865                 kfree(id);
 866                 return 0;
 867         }
 868
 869         /* 'Unclaim' this stream */
 870
 871         /* Stop radio */
 872         mutex_lock(&itv->serialize_lock);
 873         if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
 874                 /* Closing radio device, return to TV mode */
 875                 ivtv_mute(itv);
 876                 /* Mark that the radio is no longer in use */
 877                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 878                 /* Switch tuner to TV */
 879                 ivtv_call_all(itv, core, s_std, itv->std);
 880                 /* Select correct audio input (i.e. TV tuner or Line in) */
 881                 ivtv_audio_set_io(itv);
 882                 if (itv->hw_flags & IVTV_HW_SAA711X) {
 883                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 884                                         SAA7115_FREQ_32_11_MHZ, 0);
 885                 }
 886                 if (atomic_read(&itv->capturing) > 0) {
 887                         /* Undo video mute */
 888                         ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
 889                                 itv->params.video_mute | (itv->params.video_mute_yuv << 8));
 890                 }
 891                 /* Done! Unmute and continue. */
 892                 ivtv_unmute(itv);
 893                 ivtv_release_stream(s);
 894         } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 895                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 896
 897                 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
 898
 899                 /* If all output streams are closed, and if the user doesn't have
 900                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
 901                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 902                         /* disable CC on TV-out */
 903                         ivtv_disable_cc(itv);
 904                 }
 905         } else {
 906                 ivtv_stop_capture(id, 0);
 907         }
 908         kfree(id);
 909         mutex_unlock(&itv->serialize_lock);
 910         return 0;
 911 }
 912
 913 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
 914 {
 915         struct ivtv *itv = s->itv;
 916         struct ivtv_open_id *item;
 917         int res = 0;
 918
 919         IVTV_DEBUG_FILE("open %s\n", s->name);
 920
 921         if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 922                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 923                 return -EBUSY;
 924
 925         if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 926                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 927                 return -EBUSY;
 928
 929         if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 930                 if (read_reg(0x82c) == 0) {
 931                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 932                         /* return -ENODEV; */
 933                 }
 934                 ivtv_udma_alloc(itv);
 935         }
 936
 937         /* Allocate memory */
 938         item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 939         if (NULL == item) {
 940                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 941                 return -ENOMEM;
 942         }
 943         v4l2_fh_init(&item->fh, s->vdev);
 944         if (s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 945             s->type == IVTV_DEC_STREAM_TYPE_MPG) {
 946                 res = v4l2_event_alloc(&item->fh, 60);
 947         }
 948         if (res < 0) {
 949                 v4l2_fh_exit(&item->fh);
 950                 kfree(item);
 951                 return res;
 952         }
 953         item->itv = itv;
 954         item->type = s->type;
 955         v4l2_prio_open(&itv->prio, &item->prio);
 956
 957         item->open_id = itv->open_id++;
 958         filp->private_data = &item->fh;
 959
 960         if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
 961                 /* Try to claim this stream */
 962                 if (ivtv_claim_stream(item, item->type)) {
 963                         /* No, it's already in use */
 964                         kfree(item);
 965                         return -EBUSY;
 966                 }
 967
 968                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
 969                         if (atomic_read(&itv->capturing) > 0) {
 970                                 /* switching to radio while capture is
 971                                    in progress is not polite */
 972                                 ivtv_release_stream(s);
 973                                 v4l2_fh_exit(&item->fh);
 974                                 kfree(item);
 975                                 return -EBUSY;
 976                         }
 977                 }
 978                 /* Mark that the radio is being used. */
 979                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 980                 /* We have the radio */
 981                 ivtv_mute(itv);
 982                 /* Switch tuner to radio */
 983                 ivtv_call_all(itv, tuner, s_radio);
 984                 /* Select the correct audio input (i.e. radio tuner) */
 985                 ivtv_audio_set_io(itv);
 986                 if (itv->hw_flags & IVTV_HW_SAA711X) {
 987                         ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 988                                 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
 989                 }
 990                 /* Done! Unmute and continue. */
 991                 ivtv_unmute(itv);
 992         }
 993
 994         /* YUV or MPG Decoding Mode? */
 995         if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
 996                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 997         } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 998                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 999                 /* For yuv, we need to know the dma size before we start */
1000                 itv->dma_data_req_size =
1001                                 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1002                 itv->yuv_info.stream_size = 0;
1003         }
1004         v4l2_fh_add(&item->fh);
1005         return 0;
1006 }
1007
1008 int ivtv_v4l2_open(struct file *filp)
1009 {
1010         int res;
1011         struct ivtv *itv = NULL;
1012         struct ivtv_stream *s = NULL;
1013         struct video_device *vdev = video_devdata(filp);
1014
1015         s = video_get_drvdata(vdev);
1016         itv = s->itv;
1017
1018         mutex_lock(&itv->serialize_lock);
1019         if (ivtv_init_on_first_open(itv)) {
1020                 IVTV_ERR("Failed to initialize on device %s\n",
1021                          video_device_node_name(vdev));
1022                 mutex_unlock(&itv->serialize_lock);
1023                 return -ENXIO;
1024         }
1025         res = ivtv_serialized_open(s, filp);
1026         mutex_unlock(&itv->serialize_lock);
1027         return res;
1028 }
1029
1030 void ivtv_mute(struct ivtv *itv)
1031 {
1032         if (atomic_read(&itv->capturing))
1033                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1034         IVTV_DEBUG_INFO("Mute\n");
1035 }
1036
1037 void ivtv_unmute(struct ivtv *itv)
1038 {
1039         if (atomic_read(&itv->capturing)) {
1040                 ivtv_msleep_timeout(100, 0);
1041                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1042                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1043         }
1044         IVTV_DEBUG_INFO("Unmute\n");
1045 }