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_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI,
  71            CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
  72            (provided VBI insertion is on and sliced VBI is selected), for all
  73            other streams we're done */
  74         if (type == CX18_ENC_STREAM_TYPE_MPG &&
  75                    cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) {
  76                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
  77         } else {
  78                 return 0;
  79         }
  80         s_vbi = &cx->streams[vbi_type];
  81
  82         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
  83
  84         /* mark that it is used internally */
  85         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
  86         return 0;
  87 }
  88
  89 /* This function releases a previously claimed stream. It will take into
  90    account associated VBI streams. */
  91 static void cx18_release_stream(struct cx18_stream *s)
  92 {
  93         struct cx18 *cx = s->cx;
  94         struct cx18_stream *s_vbi;
  95
  96         s->id = -1;
  97         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
  98                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
  99                 /* this stream is still in use internally */
 100                 return;
 101         }
 102         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
 103                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 104                 return;
 105         }
 106
 107         cx18_flush_queues(s);
 108
 109         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
 110            for all other streams we're done */
 111         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 112                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 113         else
 114                 return;
 115
 116         /* clear internal use flag */
 117         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 118                 /* was already cleared */
 119                 return;
 120         }
 121         if (s_vbi->id != -1) {
 122                 /* VBI stream still claimed by a file descriptor */
 123                 return;
 124         }
 125         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
 126         cx18_flush_queues(s_vbi);
 127 }
 128
 129 static void cx18_dualwatch(struct cx18 *cx)
 130 {
 131         struct v4l2_tuner vt;
 132         u16 new_bitmap;
 133         u16 new_stereo_mode;
 134         const u16 stereo_mask = 0x0300;
 135         const u16 dual = 0x0200;
 136         u32 h;
 137
 138         new_stereo_mode = cx->params.audio_properties & stereo_mask;
 139         memset(&vt, 0, sizeof(vt));
 140         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
 141         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
 142                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 143                 new_stereo_mode = dual;
 144
 145         if (new_stereo_mode == cx->dualwatch_stereo_mode)
 146                 return;
 147
 148         new_bitmap = new_stereo_mode
 149                         | (cx->params.audio_properties & ~stereo_mask);
 150
 151         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. "
 152                         "new audio_bitmask=0x%ux\n",
 153                         cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 154
 155         h = cx18_find_handle(cx);
 156         if (h == CX18_INVALID_TASK_HANDLE) {
 157                 CX18_DEBUG_INFO("dualwatch: can't find valid task handle\n");
 158                 return;
 159         }
 160
 161         if (cx18_vapi(cx,
 162                       CX18_CPU_SET_AUDIO_PARAMETERS, 2, h, new_bitmap) == 0) {
 163                 cx->dualwatch_stereo_mode = new_stereo_mode;
 164                 return;
 165         }
 166         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 167 }
 168
 169
 170 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
 171 {
 172         struct cx18 *cx = s->cx;
 173         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 174         struct cx18_buffer *buf;
 175         DEFINE_WAIT(wait);
 176
 177         *err = 0;
 178         while (1) {
 179                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 180
 181                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 182                                 cx->dualwatch_jiffies = jiffies;
 183                                 cx18_dualwatch(cx);
 184                         }
 185                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 186                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 187                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 188                                         /* byteswap and process VBI data */
 189 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
 190                                         cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
 191                                 }
 192                         }
 193                         buf = &cx->vbi.sliced_mpeg_buf;
 194                         if (buf->readpos != buf->bytesused)
 195                                 return buf;
 196                 }
 197
 198                 /* do we have new data? */
 199                 buf = cx18_dequeue(s, &s->q_full);
 200                 if (buf) {
 201                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 202                                                 &buf->b_flags))
 203                                 return buf;
 204                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 205                                 /* byteswap MPG data */
 206                                 cx18_buf_swap(buf);
 207                         else {
 208                                 /* byteswap and process VBI data */
 209                                 cx18_process_vbi_data(cx, buf,
 210                                                 s->dma_pts, s->type);
 211                         }
 212                         return buf;
 213                 }
 214
 215                 /* return if end of stream */
 216                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 217                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 218                         return NULL;
 219                 }
 220
 221                 /* return if file was opened with O_NONBLOCK */
 222                 if (non_block) {
 223                         *err = -EAGAIN;
 224                         return NULL;
 225                 }
 226
 227                 /* wait for more data to arrive */
 228                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 229                 /* New buffers might have become available before we were added
 230                    to the waitqueue */
 231                 if (!atomic_read(&s->q_full.buffers))
 232                         schedule();
 233                 finish_wait(&s->waitq, &wait);
 234                 if (signal_pending(current)) {
 235                         /* return if a signal was received */
 236                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 237                         *err = -EINTR;
 238                         return NULL;
 239                 }
 240         }
 241 }
 242
 243 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 244 {
 245         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 246
 247         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 248         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 249         cx->vbi.sliced_mpeg_buf.readpos = 0;
 250 }
 251
 252 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 253                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 254 {
 255         struct cx18 *cx = s->cx;
 256         size_t len = buf->bytesused - buf->readpos;
 257
 258         if (len > ucount)
 259                 len = ucount;
 260         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 261             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
 262                 const char *start = buf->buf + buf->readpos;
 263                 const char *p = start + 1;
 264                 const u8 *q;
 265                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 266                 int stuffing, i;
 267
 268                 while (start + len > p) {
 269                         q = memchr(p, 0, start + len - p);
 270                         if (q == NULL)
 271                                 break;
 272                         p = q + 1;
 273                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 274                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 275                                 continue;
 276                         if (!cx->search_pack_header) {
 277                                 if ((q[6] & 0xc0) != 0x80)
 278                                         continue;
 279                                 if (((q[7] & 0xc0) == 0x80 &&
 280                                      (q[9] & 0xf0) == 0x20) ||
 281                                     ((q[7] & 0xc0) == 0xc0 &&
 282                                      (q[9] & 0xf0) == 0x30)) {
 283                                         ch = 0xba;
 284                                         cx->search_pack_header = 1;
 285                                         p = q + 9;
 286                                 }
 287                                 continue;
 288                         }
 289                         stuffing = q[13] & 7;
 290                         /* all stuffing bytes must be 0xff */
 291                         for (i = 0; i < stuffing; i++)
 292                                 if (q[14 + i] != 0xff)
 293                                         break;
 294                         if (i == stuffing &&
 295                             (q[4] & 0xc4) == 0x44 &&
 296                             (q[12] & 3) == 3 &&
 297                             q[14 + stuffing] == 0 &&
 298                             q[15 + stuffing] == 0 &&
 299                             q[16 + stuffing] == 1) {
 300                                 cx->search_pack_header = 0;
 301                                 len = (char *)q - start;
 302                                 cx18_setup_sliced_vbi_buf(cx);
 303                                 break;
 304                         }
 305                 }
 306         }
 307         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 308                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 309                                 len, s->name);
 310                 return -EFAULT;
 311         }
 312         buf->readpos += len;
 313         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 314             buf != &cx->vbi.sliced_mpeg_buf)
 315                 cx->mpg_data_received += len;
 316         return len;
 317 }
 318
 319 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 320                 size_t tot_count, int non_block)
 321 {
 322         struct cx18 *cx = s->cx;
 323         size_t tot_written = 0;
 324         int single_frame = 0;
 325
 326         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 327                 /* shouldn't happen */
 328                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 329                                 s->name);
 330                 return -EIO;
 331         }
 332
 333         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 334            frames should arrive one-by-one, so make sure we never output more
 335            than one VBI frame at a time */
 336         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
 337             cx->vbi.sliced_in->service_set)
 338                 single_frame = 1;
 339
 340         for (;;) {
 341                 struct cx18_buffer *buf;
 342                 int rc;
 343
 344                 buf = cx18_get_buffer(s, non_block, &rc);
 345                 /* if there is no data available... */
 346                 if (buf == NULL) {
 347                         /* if we got data, then return that regardless */
 348                         if (tot_written)
 349                                 break;
 350                         /* EOS condition */
 351                         if (rc == 0) {
 352                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 353                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 354                                 cx18_release_stream(s);
 355                         }
 356                         /* set errno */
 357                         return rc;
 358                 }
 359
 360                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 361                                 tot_count - tot_written);
 362
 363                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 364                         if (buf->readpos == buf->bytesused) {
 365                                 cx18_buf_sync_for_device(s, buf);
 366                                 cx18_enqueue(s, buf, &s->q_free);
 367                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
 368                                         s->handle,
 369                                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] -
 370                                           cx->enc_mem,
 371                                         1, buf->id, s->buf_size);
 372                         } else
 373                                 cx18_push(s, buf, &s->q_full);
 374                 } else if (buf->readpos == buf->bytesused) {
 375                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 376
 377                         cx->vbi.sliced_mpeg_size[idx] = 0;
 378                         cx->vbi.inserted_frame++;
 379                         cx->vbi_data_inserted += buf->bytesused;
 380                 }
 381                 if (rc < 0)
 382                         return rc;
 383                 tot_written += rc;
 384
 385                 if (tot_written == tot_count || single_frame)
 386                         break;
 387         }
 388         return tot_written;
 389 }
 390
 391 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 392                 size_t count, loff_t *pos, int non_block)
 393 {
 394         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 395         struct cx18 *cx = s->cx;
 396
 397         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 398         if (rc > 0)
 399                 pos += rc;
 400         return rc;
 401 }
 402
 403 int cx18_start_capture(struct cx18_open_id *id)
 404 {
 405         struct cx18 *cx = id->cx;
 406         struct cx18_stream *s = &cx->streams[id->type];
 407         struct cx18_stream *s_vbi;
 408
 409         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 410                 /* you cannot read from these stream types. */
 411                 return -EPERM;
 412         }
 413
 414         /* Try to claim this stream. */
 415         if (cx18_claim_stream(id, s->type))
 416                 return -EBUSY;
 417
 418         /* If capture is already in progress, then we also have to
 419            do nothing extra. */
 420         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 421             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 422                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 423                 return 0;
 424         }
 425
 426         /* Start VBI capture if required */
 427         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 428         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 429             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 430             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 431                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 432                    automatically when the MPG stream is claimed.
 433                    We only need to start the VBI capturing. */
 434                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 435                         CX18_DEBUG_WARN("VBI capture start failed\n");
 436
 437                         /* Failure, clean up and return an error */
 438                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 439                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 440                         /* also releases the associated VBI stream */
 441                         cx18_release_stream(s);
 442                         return -EIO;
 443                 }
 444                 CX18_DEBUG_INFO("VBI insertion started\n");
 445         }
 446
 447         /* Tell the card to start capturing */
 448         if (!cx18_start_v4l2_encode_stream(s)) {
 449                 /* We're done */
 450                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 451                 /* Resume a possibly paused encoder */
 452                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 453                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 454                 return 0;
 455         }
 456
 457         /* failure, clean up */
 458         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 459
 460         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 461            automatically when the MPG stream is released.
 462            We only need to stop the VBI capturing. */
 463         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 464             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 465                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 466                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 467         }
 468         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 469         cx18_release_stream(s);
 470         return -EIO;
 471 }
 472
 473 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 474                 loff_t *pos)
 475 {
 476         struct cx18_open_id *id = filp->private_data;
 477         struct cx18 *cx = id->cx;
 478         struct cx18_stream *s = &cx->streams[id->type];
 479         int rc;
 480
 481         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 482
 483         mutex_lock(&cx->serialize_lock);
 484         rc = cx18_start_capture(id);
 485         mutex_unlock(&cx->serialize_lock);
 486         if (rc)
 487                 return rc;
 488         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 489 }
 490
 491 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 492 {
 493         struct cx18_open_id *id = filp->private_data;
 494         struct cx18 *cx = id->cx;
 495         struct cx18_stream *s = &cx->streams[id->type];
 496         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 497
 498         /* Start a capture if there is none */
 499         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 500                 int rc;
 501
 502                 mutex_lock(&cx->serialize_lock);
 503                 rc = cx18_start_capture(id);
 504                 mutex_unlock(&cx->serialize_lock);
 505                 if (rc) {
 506                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 507                                         s->name, rc);
 508                         return POLLERR;
 509                 }
 510                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 511         }
 512
 513         /* add stream's waitq to the poll list */
 514         CX18_DEBUG_HI_FILE("Encoder poll\n");
 515         poll_wait(filp, &s->waitq, wait);
 516
 517         if (atomic_read(&s->q_full.buffers))
 518                 return POLLIN | POLLRDNORM;
 519         if (eof)
 520                 return POLLHUP;
 521         return 0;
 522 }
 523
 524 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 525 {
 526         struct cx18 *cx = id->cx;
 527         struct cx18_stream *s = &cx->streams[id->type];
 528
 529         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 530
 531         /* 'Unclaim' this stream */
 532
 533         /* Stop capturing */
 534         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 535                 struct cx18_stream *s_vbi =
 536                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 537
 538                 CX18_DEBUG_INFO("close stopping capture\n");
 539                 /* Special case: a running VBI capture for VBI insertion
 540                    in the mpeg stream. Need to stop that too. */
 541                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 542                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 543                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 544                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 545                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 546                 }
 547                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 548                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 549                         /* Also used internally, don't stop capturing */
 550                         s->id = -1;
 551                 else
 552                         cx18_stop_v4l2_encode_stream(s, gop_end);
 553         }
 554         if (!gop_end) {
 555                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 556                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 557                 cx18_release_stream(s);
 558         }
 559 }
 560
 561 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 562 {
 563         struct cx18_open_id *id = filp->private_data;
 564         struct cx18 *cx = id->cx;
 565         struct cx18_stream *s = &cx->streams[id->type];
 566
 567         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 568
 569         v4l2_prio_close(&cx->prio, &id->prio);
 570
 571         /* Easy case first: this stream was never claimed by us */
 572         if (s->id != id->open_id) {
 573                 kfree(id);
 574                 return 0;
 575         }
 576
 577         /* 'Unclaim' this stream */
 578
 579         /* Stop radio */
 580         mutex_lock(&cx->serialize_lock);
 581         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 582                 /* Closing radio device, return to TV mode */
 583                 cx18_mute(cx);
 584                 /* Mark that the radio is no longer in use */
 585                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 586                 /* Switch tuner to TV */
 587                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 588                 /* Select correct audio input (i.e. TV tuner or Line in) */
 589                 cx18_audio_set_io(cx);
 590                 if (atomic_read(&cx->ana_capturing) > 0) {
 591                         /* Undo video mute */
 592                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 593                                 cx->params.video_mute |
 594                                         (cx->params.video_mute_yuv << 8));
 595                 }
 596                 /* Done! Unmute and continue. */
 597                 cx18_unmute(cx);
 598                 cx18_release_stream(s);
 599         } else {
 600                 cx18_stop_capture(id, 0);
 601         }
 602         kfree(id);
 603         mutex_unlock(&cx->serialize_lock);
 604         return 0;
 605 }
 606
 607 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 608 {
 609         struct cx18 *cx = s->cx;
 610         struct cx18_open_id *item;
 611
 612         CX18_DEBUG_FILE("open %s\n", s->name);
 613
 614         /* Allocate memory */
 615         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 616         if (NULL == item) {
 617                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 618                 return -ENOMEM;
 619         }
 620         item->cx = cx;
 621         item->type = s->type;
 622         v4l2_prio_open(&cx->prio, &item->prio);
 623
 624         item->open_id = cx->open_id++;
 625         filp->private_data = item;
 626
 627         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 628                 /* Try to claim this stream */
 629                 if (cx18_claim_stream(item, item->type)) {
 630                         /* No, it's already in use */
 631                         kfree(item);
 632                         return -EBUSY;
 633                 }
 634
 635                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 636                         if (atomic_read(&cx->ana_capturing) > 0) {
 637                                 /* switching to radio while capture is
 638                                    in progress is not polite */
 639                                 cx18_release_stream(s);
 640                                 kfree(item);
 641                                 return -EBUSY;
 642                         }
 643                 }
 644
 645                 /* Mark that the radio is being used. */
 646                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 647                 /* We have the radio */
 648                 cx18_mute(cx);
 649                 /* Switch tuner to radio */
 650                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 651                 /* Select the correct audio input (i.e. radio tuner) */
 652                 cx18_audio_set_io(cx);
 653                 /* Done! Unmute and continue. */
 654                 cx18_unmute(cx);
 655         }
 656         return 0;
 657 }
 658
 659 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 660 {
 661         int res, x, y = 0;
 662         struct cx18 *cx = NULL;
 663         struct cx18_stream *s = NULL;
 664         int minor = iminor(inode);
 665
 666         /* Find which card this open was on */
 667         spin_lock(&cx18_cards_lock);
 668         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 669                 /* find out which stream this open was on */
 670                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 671                         if (cx18_cards[x] == NULL)
 672                                 continue;
 673                         s = &cx18_cards[x]->streams[y];
 674                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 675                                 cx = cx18_cards[x];
 676                                 break;
 677                         }
 678                 }
 679         }
 680         spin_unlock(&cx18_cards_lock);
 681
 682         if (cx == NULL) {
 683                 /* Couldn't find a device registered
 684                    on that minor, shouldn't happen! */
 685                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
 686                                 minor);
 687                 return -ENXIO;
 688         }
 689
 690         mutex_lock(&cx->serialize_lock);
 691         if (cx18_init_on_first_open(cx)) {
 692                 CX18_ERR("Failed to initialize on minor %d\n", minor);
 693                 mutex_unlock(&cx->serialize_lock);
 694                 return -ENXIO;
 695         }
 696         res = cx18_serialized_open(s, filp);
 697         mutex_unlock(&cx->serialize_lock);
 698         return res;
 699 }
 700
 701 void cx18_mute(struct cx18 *cx)
 702 {
 703         u32 h;
 704         if (atomic_read(&cx->ana_capturing)) {
 705                 h = cx18_find_handle(cx);
 706                 if (h != CX18_INVALID_TASK_HANDLE)
 707                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 708                 else
 709                         CX18_ERR("Can't find valid task handle for mute\n");
 710         }
 711         CX18_DEBUG_INFO("Mute\n");
 712 }
 713
 714 void cx18_unmute(struct cx18 *cx)
 715 {
 716         u32 h;
 717         if (atomic_read(&cx->ana_capturing)) {
 718                 h = cx18_find_handle(cx);
 719                 if (h != CX18_INVALID_TASK_HANDLE) {
 720                         cx18_msleep_timeout(100, 0);
 721                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 722                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 723                 } else
 724                         CX18_ERR("Can't find valid task handle for unmute\n");
 725         }
 726         CX18_DEBUG_INFO("Unmute\n");
 727 }