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  *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  *  02111-1307  USA
  23  */
  24
  25 #include "cx18-driver.h"
  26 #include "cx18-fileops.h"
  27 #include "cx18-i2c.h"
  28 #include "cx18-queue.h"
  29 #include "cx18-vbi.h"
  30 #include "cx18-audio.h"
  31 #include "cx18-mailbox.h"
  32 #include "cx18-scb.h"
  33 #include "cx18-streams.h"
  34 #include "cx18-controls.h"
  35 #include "cx18-ioctl.h"
  36 #include "cx18-cards.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 cx18_claim_stream(struct cx18_open_id *id, int type)
  44 {
  45         struct cx18 *cx = id->cx;
  46         struct cx18_stream *s = &cx->streams[type];
  47         struct cx18_stream *s_vbi;
  48         int vbi_type;
  49
  50         if (test_and_set_bit(CX18_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 == CX18_ENC_STREAM_TYPE_VBI) {
  57                         /* VBI is handled already internally, now also assign
  58                            the file descriptor to this stream for external
  59                            reading of the stream. */
  60                         s->id = id->open_id;
  61                         CX18_DEBUG_INFO("Start Read VBI\n");
  62                         return 0;
  63                 }
  64                 /* someone else is using this stream already */
  65                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
  66                 return -EBUSY;
  67         }
  68         s->id = id->open_id;
  69
  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 && !cx18_raw_vbi(cx)) {
  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         u32 h;
 136
 137         new_stereo_mode = cx->params.audio_properties & stereo_mask;
 138         memset(&vt, 0, sizeof(vt));
 139         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
 140         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
 141                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 142                 new_stereo_mode = dual;
 143
 144         if (new_stereo_mode == cx->dualwatch_stereo_mode)
 145                 return;
 146
 147         new_bitmap = new_stereo_mode
 148                         | (cx->params.audio_properties & ~stereo_mask);
 149
 150         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. "
 151                         "new audio_bitmask=0x%ux\n",
 152                         cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 153
 154         h = cx18_find_handle(cx);
 155         if (h == CX18_INVALID_TASK_HANDLE) {
 156                 CX18_DEBUG_INFO("dualwatch: can't find valid task handle\n");
 157                 return;
 158         }
 159
 160         if (cx18_vapi(cx,
 161                       CX18_CPU_SET_AUDIO_PARAMETERS, 2, h, new_bitmap) == 0) {
 162                 cx->dualwatch_stereo_mode = new_stereo_mode;
 163                 return;
 164         }
 165         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 166 }
 167
 168
 169 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
 170 {
 171         struct cx18 *cx = s->cx;
 172         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 173         struct cx18_buffer *buf;
 174         DEFINE_WAIT(wait);
 175
 176         *err = 0;
 177         while (1) {
 178                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 179
 180                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 181                                 cx->dualwatch_jiffies = jiffies;
 182                                 cx18_dualwatch(cx);
 183                         }
 184                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 185                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 186                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 187                                         /* byteswap and process VBI data */
 188 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
 189                                         cx18_stream_put_buf_fw(s_vbi, buf);
 190                                 }
 191                         }
 192                         buf = &cx->vbi.sliced_mpeg_buf;
 193                         if (buf->readpos != buf->bytesused)
 194                                 return buf;
 195                 }
 196
 197                 /* do we have new data? */
 198                 buf = cx18_dequeue(s, &s->q_full);
 199                 if (buf) {
 200                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 201                                                 &buf->b_flags))
 202                                 return buf;
 203                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 204                                 /* byteswap MPG data */
 205                                 cx18_buf_swap(buf);
 206                         else {
 207                                 /* byteswap and process VBI data */
 208                                 cx18_process_vbi_data(cx, buf,
 209                                                 s->dma_pts, s->type);
 210                         }
 211                         return buf;
 212                 }
 213
 214                 /* return if end of stream */
 215                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 216                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 217                         return NULL;
 218                 }
 219
 220                 /* return if file was opened with O_NONBLOCK */
 221                 if (non_block) {
 222                         *err = -EAGAIN;
 223                         return NULL;
 224                 }
 225
 226                 /* wait for more data to arrive */
 227                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 228                 /* New buffers might have become available before we were added
 229                    to the waitqueue */
 230                 if (!atomic_read(&s->q_full.buffers))
 231                         schedule();
 232                 finish_wait(&s->waitq, &wait);
 233                 if (signal_pending(current)) {
 234                         /* return if a signal was received */
 235                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 236                         *err = -EINTR;
 237                         return NULL;
 238                 }
 239         }
 240 }
 241
 242 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 243 {
 244         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 245
 246         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 247         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 248         cx->vbi.sliced_mpeg_buf.readpos = 0;
 249 }
 250
 251 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 252                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 253 {
 254         struct cx18 *cx = s->cx;
 255         size_t len = buf->bytesused - buf->readpos;
 256
 257         if (len > ucount)
 258                 len = ucount;
 259         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 260             !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
 261                 const char *start = buf->buf + buf->readpos;
 262                 const char *p = start + 1;
 263                 const u8 *q;
 264                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 265                 int stuffing, i;
 266
 267                 while (start + len > p) {
 268                         q = memchr(p, 0, start + len - p);
 269                         if (q == NULL)
 270                                 break;
 271                         p = q + 1;
 272                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 273                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 274                                 continue;
 275                         if (!cx->search_pack_header) {
 276                                 if ((q[6] & 0xc0) != 0x80)
 277                                         continue;
 278                                 if (((q[7] & 0xc0) == 0x80 &&
 279                                      (q[9] & 0xf0) == 0x20) ||
 280                                     ((q[7] & 0xc0) == 0xc0 &&
 281                                      (q[9] & 0xf0) == 0x30)) {
 282                                         ch = 0xba;
 283                                         cx->search_pack_header = 1;
 284                                         p = q + 9;
 285                                 }
 286                                 continue;
 287                         }
 288                         stuffing = q[13] & 7;
 289                         /* all stuffing bytes must be 0xff */
 290                         for (i = 0; i < stuffing; i++)
 291                                 if (q[14 + i] != 0xff)
 292                                         break;
 293                         if (i == stuffing &&
 294                             (q[4] & 0xc4) == 0x44 &&
 295                             (q[12] & 3) == 3 &&
 296                             q[14 + stuffing] == 0 &&
 297                             q[15 + stuffing] == 0 &&
 298                             q[16 + stuffing] == 1) {
 299                                 cx->search_pack_header = 0;
 300                                 len = (char *)q - start;
 301                                 cx18_setup_sliced_vbi_buf(cx);
 302                                 break;
 303                         }
 304                 }
 305         }
 306         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 307                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 308                                 len, s->name);
 309                 return -EFAULT;
 310         }
 311         buf->readpos += len;
 312         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 313             buf != &cx->vbi.sliced_mpeg_buf)
 314                 cx->mpg_data_received += len;
 315         return len;
 316 }
 317
 318 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 319                 size_t tot_count, int non_block)
 320 {
 321         struct cx18 *cx = s->cx;
 322         size_t tot_written = 0;
 323         int single_frame = 0;
 324
 325         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 326                 /* shouldn't happen */
 327                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 328                                 s->name);
 329                 return -EIO;
 330         }
 331
 332         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 333            frames should arrive one-by-one, so make sure we never output more
 334            than one VBI frame at a time */
 335         if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
 336                 single_frame = 1;
 337
 338         for (;;) {
 339                 struct cx18_buffer *buf;
 340                 int rc;
 341
 342                 buf = cx18_get_buffer(s, non_block, &rc);
 343                 /* if there is no data available... */
 344                 if (buf == NULL) {
 345                         /* if we got data, then return that regardless */
 346                         if (tot_written)
 347                                 break;
 348                         /* EOS condition */
 349                         if (rc == 0) {
 350                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 351                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 352                                 cx18_release_stream(s);
 353                         }
 354                         /* set errno */
 355                         return rc;
 356                 }
 357
 358                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 359                                 tot_count - tot_written);
 360
 361                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 362                         if (buf->readpos == buf->bytesused)
 363                                 cx18_stream_put_buf_fw(s, buf);
 364                         else
 365                                 cx18_push(s, buf, &s->q_full);
 366                 } else if (buf->readpos == buf->bytesused) {
 367                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 368
 369                         cx->vbi.sliced_mpeg_size[idx] = 0;
 370                         cx->vbi.inserted_frame++;
 371                         cx->vbi_data_inserted += buf->bytesused;
 372                 }
 373                 if (rc < 0)
 374                         return rc;
 375                 tot_written += rc;
 376
 377                 if (tot_written == tot_count || single_frame)
 378                         break;
 379         }
 380         return tot_written;
 381 }
 382
 383 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 384                 size_t count, loff_t *pos, int non_block)
 385 {
 386         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 387         struct cx18 *cx = s->cx;
 388
 389         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 390         if (rc > 0)
 391                 pos += rc;
 392         return rc;
 393 }
 394
 395 int cx18_start_capture(struct cx18_open_id *id)
 396 {
 397         struct cx18 *cx = id->cx;
 398         struct cx18_stream *s = &cx->streams[id->type];
 399         struct cx18_stream *s_vbi;
 400
 401         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 402                 /* you cannot read from these stream types. */
 403                 return -EPERM;
 404         }
 405
 406         /* Try to claim this stream. */
 407         if (cx18_claim_stream(id, s->type))
 408                 return -EBUSY;
 409
 410         /* If capture is already in progress, then we also have to
 411            do nothing extra. */
 412         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 413             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 414                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 415                 return 0;
 416         }
 417
 418         /* Start VBI capture if required */
 419         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 420         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 421             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 422             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 423                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 424                    automatically when the MPG stream is claimed.
 425                    We only need to start the VBI capturing. */
 426                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 427                         CX18_DEBUG_WARN("VBI capture start failed\n");
 428
 429                         /* Failure, clean up and return an error */
 430                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 431                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 432                         /* also releases the associated VBI stream */
 433                         cx18_release_stream(s);
 434                         return -EIO;
 435                 }
 436                 CX18_DEBUG_INFO("VBI insertion started\n");
 437         }
 438
 439         /* Tell the card to start capturing */
 440         if (!cx18_start_v4l2_encode_stream(s)) {
 441                 /* We're done */
 442                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 443                 /* Resume a possibly paused encoder */
 444                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 445                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 446                 return 0;
 447         }
 448
 449         /* failure, clean up */
 450         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 451
 452         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 453            automatically when the MPG stream is released.
 454            We only need to stop the VBI capturing. */
 455         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 456             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 457                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 458                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 459         }
 460         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 461         cx18_release_stream(s);
 462         return -EIO;
 463 }
 464
 465 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 466                 loff_t *pos)
 467 {
 468         struct cx18_open_id *id = filp->private_data;
 469         struct cx18 *cx = id->cx;
 470         struct cx18_stream *s = &cx->streams[id->type];
 471         int rc;
 472
 473         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 474
 475         mutex_lock(&cx->serialize_lock);
 476         rc = cx18_start_capture(id);
 477         mutex_unlock(&cx->serialize_lock);
 478         if (rc)
 479                 return rc;
 480         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 481 }
 482
 483 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 484 {
 485         struct cx18_open_id *id = filp->private_data;
 486         struct cx18 *cx = id->cx;
 487         struct cx18_stream *s = &cx->streams[id->type];
 488         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 489
 490         /* Start a capture if there is none */
 491         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 492                 int rc;
 493
 494                 mutex_lock(&cx->serialize_lock);
 495                 rc = cx18_start_capture(id);
 496                 mutex_unlock(&cx->serialize_lock);
 497                 if (rc) {
 498                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 499                                         s->name, rc);
 500                         return POLLERR;
 501                 }
 502                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 503         }
 504
 505         /* add stream's waitq to the poll list */
 506         CX18_DEBUG_HI_FILE("Encoder poll\n");
 507         poll_wait(filp, &s->waitq, wait);
 508
 509         if (atomic_read(&s->q_full.buffers))
 510                 return POLLIN | POLLRDNORM;
 511         if (eof)
 512                 return POLLHUP;
 513         return 0;
 514 }
 515
 516 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 517 {
 518         struct cx18 *cx = id->cx;
 519         struct cx18_stream *s = &cx->streams[id->type];
 520
 521         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 522
 523         /* 'Unclaim' this stream */
 524
 525         /* Stop capturing */
 526         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 527                 struct cx18_stream *s_vbi =
 528                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 529
 530                 CX18_DEBUG_INFO("close stopping capture\n");
 531                 /* Special case: a running VBI capture for VBI insertion
 532                    in the mpeg stream. Need to stop that too. */
 533                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 534                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 535                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 536                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 537                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 538                 }
 539                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 540                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 541                         /* Also used internally, don't stop capturing */
 542                         s->id = -1;
 543                 else
 544                         cx18_stop_v4l2_encode_stream(s, gop_end);
 545         }
 546         if (!gop_end) {
 547                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 548                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 549                 cx18_release_stream(s);
 550         }
 551 }
 552
 553 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 554 {
 555         struct cx18_open_id *id = filp->private_data;
 556         struct cx18 *cx = id->cx;
 557         struct cx18_stream *s = &cx->streams[id->type];
 558
 559         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 560
 561         v4l2_prio_close(&cx->prio, &id->prio);
 562
 563         /* Easy case first: this stream was never claimed by us */
 564         if (s->id != id->open_id) {
 565                 kfree(id);
 566                 return 0;
 567         }
 568
 569         /* 'Unclaim' this stream */
 570
 571         /* Stop radio */
 572         mutex_lock(&cx->serialize_lock);
 573         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 574                 /* Closing radio device, return to TV mode */
 575                 cx18_mute(cx);
 576                 /* Mark that the radio is no longer in use */
 577                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 578                 /* Switch tuner to TV */
 579                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 580                 /* Select correct audio input (i.e. TV tuner or Line in) */
 581                 cx18_audio_set_io(cx);
 582                 if (atomic_read(&cx->ana_capturing) > 0) {
 583                         /* Undo video mute */
 584                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 585                                 cx->params.video_mute |
 586                                         (cx->params.video_mute_yuv << 8));
 587                 }
 588                 /* Done! Unmute and continue. */
 589                 cx18_unmute(cx);
 590                 cx18_release_stream(s);
 591         } else {
 592                 cx18_stop_capture(id, 0);
 593         }
 594         kfree(id);
 595         mutex_unlock(&cx->serialize_lock);
 596         return 0;
 597 }
 598
 599 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 600 {
 601         struct cx18 *cx = s->cx;
 602         struct cx18_open_id *item;
 603
 604         CX18_DEBUG_FILE("open %s\n", s->name);
 605
 606         /* Allocate memory */
 607         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 608         if (NULL == item) {
 609                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 610                 return -ENOMEM;
 611         }
 612         item->cx = cx;
 613         item->type = s->type;
 614         v4l2_prio_open(&cx->prio, &item->prio);
 615
 616         item->open_id = cx->open_id++;
 617         filp->private_data = item;
 618
 619         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 620                 /* Try to claim this stream */
 621                 if (cx18_claim_stream(item, item->type)) {
 622                         /* No, it's already in use */
 623                         kfree(item);
 624                         return -EBUSY;
 625                 }
 626
 627                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 628                         if (atomic_read(&cx->ana_capturing) > 0) {
 629                                 /* switching to radio while capture is
 630                                    in progress is not polite */
 631                                 cx18_release_stream(s);
 632                                 kfree(item);
 633                                 return -EBUSY;
 634                         }
 635                 }
 636
 637                 /* Mark that the radio is being used. */
 638                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 639                 /* We have the radio */
 640                 cx18_mute(cx);
 641                 /* Switch tuner to radio */
 642                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 643                 /* Select the correct audio input (i.e. radio tuner) */
 644                 cx18_audio_set_io(cx);
 645                 /* Done! Unmute and continue. */
 646                 cx18_unmute(cx);
 647         }
 648         return 0;
 649 }
 650
 651 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 652 {
 653         int res, x, y = 0;
 654         struct cx18 *cx = NULL;
 655         struct cx18_stream *s = NULL;
 656         int minor = iminor(inode);
 657
 658         /* Find which card this open was on */
 659         spin_lock(&cx18_cards_lock);
 660         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 661                 /* find out which stream this open was on */
 662                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 663                         if (cx18_cards[x] == NULL)
 664                                 continue;
 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         u32 h;
 696         if (atomic_read(&cx->ana_capturing)) {
 697                 h = cx18_find_handle(cx);
 698                 if (h != CX18_INVALID_TASK_HANDLE)
 699                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 700                 else
 701                         CX18_ERR("Can't find valid task handle for mute\n");
 702         }
 703         CX18_DEBUG_INFO("Mute\n");
 704 }
 705
 706 void cx18_unmute(struct cx18 *cx)
 707 {
 708         u32 h;
 709         if (atomic_read(&cx->ana_capturing)) {
 710                 h = cx18_find_handle(cx);
 711                 if (h != CX18_INVALID_TASK_HANDLE) {
 712                         cx18_msleep_timeout(100, 0);
 713                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 714                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 715                 } else
 716                         CX18_ERR("Can't find valid task handle for unmute\n");
 717         }
 718         CX18_DEBUG_INFO("Unmute\n");
 719 }