git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/cx18/cx18-fileops.c

   1 /*
   2  *  cx18 file operation functions
   3  *
   4  *  Derived from ivtv-fileops.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-fileops.h"
  26 #include "cx18-i2c.h"
  27 #include "cx18-queue.h"
  28 #include "cx18-vbi.h"
  29 #include "cx18-audio.h"
  30 #include "cx18-mailbox.h"
  31 #include "cx18-scb.h"
  32 #include "cx18-streams.h"
  33 #include "cx18-controls.h"
  34 #include "cx18-ioctl.h"
  35 #include "cx18-cards.h"
  36
  37 /* This function tries to claim the stream for a specific file descriptor.
  38    If no one else is using this stream then the stream is claimed and
  39    associated VBI streams are also automatically claimed.
  40    Possible error returns: -EBUSY if someone else has claimed
  41    the stream or 0 on success. */
  42 static int cx18_claim_stream(struct cx18_open_id *id, int type)
  43 {
  44         struct cx18 *cx = id->cx;
  45         struct cx18_stream *s = &cx->streams[type];
  46         struct cx18_stream *s_vbi;
  47         int vbi_type;
  48
  49         if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
  50                 /* someone already claimed this stream */
  51                 if (s->id == id->open_id) {
  52                         /* yes, this file descriptor did. So that's OK. */
  53                         return 0;
  54                 }
  55                 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
  56                         /* VBI is handled already internally, now also assign
  57                            the file descriptor to this stream for external
  58                            reading of the stream. */
  59                         s->id = id->open_id;
  60                         CX18_DEBUG_INFO("Start Read VBI\n");
  61                         return 0;
  62                 }
  63                 /* someone else is using this stream already */
  64                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
  65                 return -EBUSY;
  66         }
  67         s->id = id->open_id;
  68
  69         /* CX18_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI,
  70            CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
  71            (provided VBI insertion is on and sliced VBI is selected), for all
  72            other streams we're done */
  73         if (type == CX18_ENC_STREAM_TYPE_MPG &&
  74                    cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) {
  75                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
  76         } else {
  77                 return 0;
  78         }
  79         s_vbi = &cx->streams[vbi_type];
  80
  81         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
  82
  83         /* mark that it is used internally */
  84         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
  85         return 0;
  86 }
  87
  88 /* This function releases a previously claimed stream. It will take into
  89    account associated VBI streams. */
  90 static void cx18_release_stream(struct cx18_stream *s)
  91 {
  92         struct cx18 *cx = s->cx;
  93         struct cx18_stream *s_vbi;
  94
  95         s->id = -1;
  96         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
  97                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
  98                 /* this stream is still in use internally */
  99                 return;
 100         }
 101         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
 102                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 103                 return;
 104         }
 105
 106         cx18_flush_queues(s);
 107
 108         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
 109            for all other streams we're done */
 110         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 111                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 112         else
 113                 return;
 114
 115         /* clear internal use flag */
 116         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 117                 /* was already cleared */
 118                 return;
 119         }
 120         if (s_vbi->id != -1) {
 121                 /* VBI stream still claimed by a file descriptor */
 122                 return;
 123         }
 124         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
 125         cx18_flush_queues(s_vbi);
 126 }
 127
 128 static void cx18_dualwatch(struct cx18 *cx)
 129 {
 130         struct v4l2_tuner vt;
 131         u16 new_bitmap;
 132         u16 new_stereo_mode;
 133         const u16 stereo_mask = 0x0300;
 134         const u16 dual = 0x0200;
 135
 136         new_stereo_mode = cx->params.audio_properties & stereo_mask;
 137         memset(&vt, 0, sizeof(vt));
 138         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
 139         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
 140                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 141                 new_stereo_mode = dual;
 142
 143         if (new_stereo_mode == cx->dualwatch_stereo_mode)
 144                 return;
 145
 146         new_bitmap = new_stereo_mode | (cx->params.audio_properties & ~stereo_mask);
 147
 148         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 149                            cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 150
 151         if (cx18_vapi(cx, CX18_CPU_SET_AUDIO_PARAMETERS, 2,
 152                                 cx18_find_handle(cx), new_bitmap) == 0) {
 153                 cx->dualwatch_stereo_mode = new_stereo_mode;
 154                 return;
 155         }
 156         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 157 }
 158
 159
 160 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
 161 {
 162         struct cx18 *cx = s->cx;
 163         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 164         struct cx18_buffer *buf;
 165         DEFINE_WAIT(wait);
 166
 167         *err = 0;
 168         while (1) {
 169                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 170
 171                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 172                                 cx->dualwatch_jiffies = jiffies;
 173                                 cx18_dualwatch(cx);
 174                         }
 175                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 176                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 177                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 178                                         /* byteswap and process VBI data */
 179 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
 180                                         cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
 181                                 }
 182                         }
 183                         buf = &cx->vbi.sliced_mpeg_buf;
 184                         if (buf->readpos != buf->bytesused)
 185                                 return buf;
 186                 }
 187
 188                 /* do we have leftover data? */
 189                 buf = cx18_dequeue(s, &s->q_io);
 190                 if (buf)
 191                         return buf;
 192
 193                 /* do we have new data? */
 194                 buf = cx18_dequeue(s, &s->q_full);
 195                 if (buf) {
 196                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 197                                                 &buf->b_flags))
 198                                 return buf;
 199                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 200                                 /* byteswap MPG data */
 201                                 cx18_buf_swap(buf);
 202                         else {
 203                                 /* byteswap and process VBI data */
 204                                 cx18_process_vbi_data(cx, buf,
 205                                                 s->dma_pts, s->type);
 206                         }
 207                         return buf;
 208                 }
 209
 210                 /* return if end of stream */
 211                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 212                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 213                         return NULL;
 214                 }
 215
 216                 /* return if file was opened with O_NONBLOCK */
 217                 if (non_block) {
 218                         *err = -EAGAIN;
 219                         return NULL;
 220                 }
 221
 222                 /* wait for more data to arrive */
 223                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 224                 /* New buffers might have become available before we were added
 225                    to the waitqueue */
 226                 if (!s->q_full.buffers)
 227                         schedule();
 228                 finish_wait(&s->waitq, &wait);
 229                 if (signal_pending(current)) {
 230                         /* return if a signal was received */
 231                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 232                         *err = -EINTR;
 233                         return NULL;
 234                 }
 235         }
 236 }
 237
 238 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 239 {
 240         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 241
 242         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 243         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 244         cx->vbi.sliced_mpeg_buf.readpos = 0;
 245 }
 246
 247 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 248                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 249 {
 250         struct cx18 *cx = s->cx;
 251         size_t len = buf->bytesused - buf->readpos;
 252
 253         if (len > ucount)
 254                 len = ucount;
 255         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 256             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
 257                 const char *start = buf->buf + buf->readpos;
 258                 const char *p = start + 1;
 259                 const u8 *q;
 260                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 261                 int stuffing, i;
 262
 263                 while (start + len > p) {
 264                         q = memchr(p, 0, start + len - p);
 265                         if (q == NULL)
 266                                 break;
 267                         p = q + 1;
 268                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 269                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 270                                 continue;
 271                         if (!cx->search_pack_header) {
 272                                 if ((q[6] & 0xc0) != 0x80)
 273                                         continue;
 274                                 if (((q[7] & 0xc0) == 0x80 &&
 275                                      (q[9] & 0xf0) == 0x20) ||
 276                                     ((q[7] & 0xc0) == 0xc0 &&
 277                                      (q[9] & 0xf0) == 0x30)) {
 278                                         ch = 0xba;
 279                                         cx->search_pack_header = 1;
 280                                         p = q + 9;
 281                                 }
 282                                 continue;
 283                         }
 284                         stuffing = q[13] & 7;
 285                         /* all stuffing bytes must be 0xff */
 286                         for (i = 0; i < stuffing; i++)
 287                                 if (q[14 + i] != 0xff)
 288                                         break;
 289                         if (i == stuffing &&
 290                             (q[4] & 0xc4) == 0x44 &&
 291                             (q[12] & 3) == 3 &&
 292                             q[14 + stuffing] == 0 &&
 293                             q[15 + stuffing] == 0 &&
 294                             q[16 + stuffing] == 1) {
 295                                 cx->search_pack_header = 0;
 296                                 len = (char *)q - start;
 297                                 cx18_setup_sliced_vbi_buf(cx);
 298                                 break;
 299                         }
 300                 }
 301         }
 302         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 303                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 304                                 len, s->name);
 305                 return -EFAULT;
 306         }
 307         buf->readpos += len;
 308         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 309             buf != &cx->vbi.sliced_mpeg_buf)
 310                 cx->mpg_data_received += len;
 311         return len;
 312 }
 313
 314 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 315                 size_t tot_count, int non_block)
 316 {
 317         struct cx18 *cx = s->cx;
 318         size_t tot_written = 0;
 319         int single_frame = 0;
 320
 321         if (atomic_read(&cx->capturing) == 0 && s->id == -1) {
 322                 /* shouldn't happen */
 323                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 324                                 s->name);
 325                 return -EIO;
 326         }
 327
 328         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 329            frames should arrive one-by-one, so make sure we never output more
 330            than one VBI frame at a time */
 331         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
 332             cx->vbi.sliced_in->service_set)
 333                 single_frame = 1;
 334
 335         for (;;) {
 336                 struct cx18_buffer *buf;
 337                 int rc;
 338
 339                 buf = cx18_get_buffer(s, non_block, &rc);
 340                 /* if there is no data available... */
 341                 if (buf == NULL) {
 342                         /* if we got data, then return that regardless */
 343                         if (tot_written)
 344                                 break;
 345                         /* EOS condition */
 346                         if (rc == 0) {
 347                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 348                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 349                                 cx18_release_stream(s);
 350                         }
 351                         /* set errno */
 352                         return rc;
 353                 }
 354
 355                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 356                                 tot_count - tot_written);
 357
 358                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 359                         if (buf->readpos == buf->bytesused) {
 360                                 cx18_buf_sync_for_device(s, buf);
 361                                 cx18_enqueue(s, buf, &s->q_free);
 362                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
 363                                         s->handle,
 364                                         (void *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
 365                                         1, buf->id, s->buf_size);
 366                         } else
 367                                 cx18_enqueue(s, buf, &s->q_io);
 368                 } else if (buf->readpos == buf->bytesused) {
 369                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 370
 371                         cx->vbi.sliced_mpeg_size[idx] = 0;
 372                         cx->vbi.inserted_frame++;
 373                         cx->vbi_data_inserted += buf->bytesused;
 374                 }
 375                 if (rc < 0)
 376                         return rc;
 377                 tot_written += rc;
 378
 379                 if (tot_written == tot_count || single_frame)
 380                         break;
 381         }
 382         return tot_written;
 383 }
 384
 385 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 386                 size_t count, loff_t *pos, int non_block)
 387 {
 388         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 389         struct cx18 *cx = s->cx;
 390
 391         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 392         if (rc > 0)
 393                 pos += rc;
 394         return rc;
 395 }
 396
 397 int cx18_start_capture(struct cx18_open_id *id)
 398 {
 399         struct cx18 *cx = id->cx;
 400         struct cx18_stream *s = &cx->streams[id->type];
 401         struct cx18_stream *s_vbi;
 402
 403         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 404                 /* you cannot read from these stream types. */
 405                 return -EPERM;
 406         }
 407
 408         /* Try to claim this stream. */
 409         if (cx18_claim_stream(id, s->type))
 410                 return -EBUSY;
 411
 412         /* If capture is already in progress, then we also have to
 413            do nothing extra. */
 414         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 415             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 416                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 417                 return 0;
 418         }
 419
 420         /* Start VBI capture if required */
 421         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 422         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 423             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 424             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 425                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 426                    automatically when the MPG stream is claimed.
 427                    We only need to start the VBI capturing. */
 428                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 429                         CX18_DEBUG_WARN("VBI capture start failed\n");
 430
 431                         /* Failure, clean up and return an error */
 432                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 433                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 434                         /* also releases the associated VBI stream */
 435                         cx18_release_stream(s);
 436                         return -EIO;
 437                 }
 438                 CX18_DEBUG_INFO("VBI insertion started\n");
 439         }
 440
 441         /* Tell the card to start capturing */
 442         if (!cx18_start_v4l2_encode_stream(s)) {
 443                 /* We're done */
 444                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 445                 /* Resume a possibly paused encoder */
 446                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 447                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 448                 return 0;
 449         }
 450
 451         /* failure, clean up */
 452         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 453
 454         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 455            automatically when the MPG stream is released.
 456            We only need to stop the VBI capturing. */
 457         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 458             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 459                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 460                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 461         }
 462         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 463         cx18_release_stream(s);
 464         return -EIO;
 465 }
 466
 467 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 468                 loff_t *pos)
 469 {
 470         struct cx18_open_id *id = filp->private_data;
 471         struct cx18 *cx = id->cx;
 472         struct cx18_stream *s = &cx->streams[id->type];
 473         int rc;
 474
 475         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 476
 477         mutex_lock(&cx->serialize_lock);
 478         rc = cx18_start_capture(id);
 479         mutex_unlock(&cx->serialize_lock);
 480         if (rc)
 481                 return rc;
 482         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 483 }
 484
 485 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 486 {
 487         struct cx18_open_id *id = filp->private_data;
 488         struct cx18 *cx = id->cx;
 489         struct cx18_stream *s = &cx->streams[id->type];
 490         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 491
 492         /* Start a capture if there is none */
 493         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 494                 int rc;
 495
 496                 mutex_lock(&cx->serialize_lock);
 497                 rc = cx18_start_capture(id);
 498                 mutex_unlock(&cx->serialize_lock);
 499                 if (rc) {
 500                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 501                                         s->name, rc);
 502                         return POLLERR;
 503                 }
 504                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 505         }
 506
 507         /* add stream's waitq to the poll list */
 508         CX18_DEBUG_HI_FILE("Encoder poll\n");
 509         poll_wait(filp, &s->waitq, wait);
 510
 511         if (s->q_full.length || s->q_io.length)
 512                 return POLLIN | POLLRDNORM;
 513         if (eof)
 514                 return POLLHUP;
 515         return 0;
 516 }
 517
 518 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 519 {
 520         struct cx18 *cx = id->cx;
 521         struct cx18_stream *s = &cx->streams[id->type];
 522
 523         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 524
 525         /* 'Unclaim' this stream */
 526
 527         /* Stop capturing */
 528         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 529                 struct cx18_stream *s_vbi =
 530                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 531
 532                 CX18_DEBUG_INFO("close stopping capture\n");
 533                 /* Special case: a running VBI capture for VBI insertion
 534                    in the mpeg stream. Need to stop that too. */
 535                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 536                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 537                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 538                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 539                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 540                 }
 541                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 542                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 543                         /* Also used internally, don't stop capturing */
 544                         s->id = -1;
 545                 else
 546                         cx18_stop_v4l2_encode_stream(s, gop_end);
 547         }
 548         if (!gop_end) {
 549                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 550                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 551                 cx18_release_stream(s);
 552         }
 553 }
 554
 555 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 556 {
 557         struct cx18_open_id *id = filp->private_data;
 558         struct cx18 *cx = id->cx;
 559         struct cx18_stream *s = &cx->streams[id->type];
 560
 561         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 562
 563         v4l2_prio_close(&cx->prio, &id->prio);
 564
 565         /* Easy case first: this stream was never claimed by us */
 566         if (s->id != id->open_id) {
 567                 kfree(id);
 568                 return 0;
 569         }
 570
 571         /* 'Unclaim' this stream */
 572
 573         /* Stop radio */
 574         mutex_lock(&cx->serialize_lock);
 575         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 576                 /* Closing radio device, return to TV mode */
 577                 cx18_mute(cx);
 578                 /* Mark that the radio is no longer in use */
 579                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 580                 /* Switch tuner to TV */
 581                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 582                 /* Select correct audio input (i.e. TV tuner or Line in) */
 583                 cx18_audio_set_io(cx);
 584                 if (atomic_read(&cx->capturing) > 0) {
 585                         /* Undo video mute */
 586                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 587                                 cx->params.video_mute |
 588                                         (cx->params.video_mute_yuv << 8));
 589                 }
 590                 /* Done! Unmute and continue. */
 591                 cx18_unmute(cx);
 592                 cx18_release_stream(s);
 593         } else {
 594                 cx18_stop_capture(id, 0);
 595         }
 596         kfree(id);
 597         mutex_unlock(&cx->serialize_lock);
 598         return 0;
 599 }
 600
 601 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 602 {
 603         struct cx18 *cx = s->cx;
 604         struct cx18_open_id *item;
 605
 606         CX18_DEBUG_FILE("open %s\n", s->name);
 607
 608         /* Allocate memory */
 609         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 610         if (NULL == item) {
 611                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 612                 return -ENOMEM;
 613         }
 614         item->cx = cx;
 615         item->type = s->type;
 616         v4l2_prio_open(&cx->prio, &item->prio);
 617
 618         item->open_id = cx->open_id++;
 619         filp->private_data = item;
 620
 621         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 622                 /* Try to claim this stream */
 623                 if (cx18_claim_stream(item, item->type)) {
 624                         /* No, it's already in use */
 625                         kfree(item);
 626                         return -EBUSY;
 627                 }
 628
 629                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 630                         if (atomic_read(&cx->capturing) > 0) {
 631                                 /* switching to radio while capture is
 632                                    in progress is not polite */
 633                                 cx18_release_stream(s);
 634                                 kfree(item);
 635                                 return -EBUSY;
 636                         }
 637                 }
 638
 639                 /* Mark that the radio is being used. */
 640                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 641                 /* We have the radio */
 642                 cx18_mute(cx);
 643                 /* Switch tuner to radio */
 644                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 645                 /* Select the correct audio input (i.e. radio tuner) */
 646                 cx18_audio_set_io(cx);
 647                 /* Done! Unmute and continue. */
 648                 cx18_unmute(cx);
 649         }
 650         return 0;
 651 }
 652
 653 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 654 {
 655         int res, x, y = 0;
 656         struct cx18 *cx = NULL;
 657         struct cx18_stream *s = NULL;
 658         int minor = iminor(inode);
 659
 660         /* Find which card this open was on */
 661         spin_lock(&cx18_cards_lock);
 662         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 663                 /* find out which stream this open was on */
 664                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 665                         s = &cx18_cards[x]->streams[y];
 666                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 667                                 cx = cx18_cards[x];
 668                                 break;
 669                         }
 670                 }
 671         }
 672         spin_unlock(&cx18_cards_lock);
 673
 674         if (cx == NULL) {
 675                 /* Couldn't find a device registered
 676                    on that minor, shouldn't happen! */
 677                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
 678                                 minor);
 679                 return -ENXIO;
 680         }
 681
 682         mutex_lock(&cx->serialize_lock);
 683         if (cx18_init_on_first_open(cx)) {
 684                 CX18_ERR("Failed to initialize on minor %d\n", minor);
 685                 mutex_unlock(&cx->serialize_lock);
 686                 return -ENXIO;
 687         }
 688         res = cx18_serialized_open(s, filp);
 689         mutex_unlock(&cx->serialize_lock);
 690         return res;
 691 }
 692
 693 void cx18_mute(struct cx18 *cx)
 694 {
 695         if (atomic_read(&cx->capturing))
 696                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
 697                                 cx18_find_handle(cx), 1);
 698         CX18_DEBUG_INFO("Mute\n");
 699 }
 700
 701 void cx18_unmute(struct cx18 *cx)
 702 {
 703         if (atomic_read(&cx->capturing)) {
 704                 cx18_msleep_timeout(100, 0);
 705                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2,
 706                                 cx18_find_handle(cx), 12);
 707                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
 708                                 cx18_find_handle(cx), 0);
 709         }
 710         CX18_DEBUG_INFO("Unmute\n");
 711 }