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         u32 new_bitmap;
 132         u32 new_stereo_mode;
 133         const u32 stereo_mask = 0x0300;
 134         const u32 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_all(cx, tuner, 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                         /* Process pending program info updates and pending
 180                            VBI data */
 181
 182                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 183                                 cx->dualwatch_jiffies = jiffies;
 184                                 cx18_dualwatch(cx);
 185                         }
 186                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 187                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 188                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 189                                         /* byteswap and process VBI data */
 190                                         cx18_process_vbi_data(cx, buf,
 191                                                               s_vbi->type);
 192                                         cx18_stream_put_buf_fw(s_vbi, buf);
 193                                 }
 194                         }
 195                         buf = &cx->vbi.sliced_mpeg_buf;
 196                         if (buf->readpos != buf->bytesused)
 197                                 return buf;
 198                 }
 199
 200                 /* do we have new data? */
 201                 buf = cx18_dequeue(s, &s->q_full);
 202                 if (buf) {
 203                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 204                                                 &buf->b_flags))
 205                                 return buf;
 206                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 207                                 /* byteswap MPG data */
 208                                 cx18_buf_swap(buf);
 209                         else {
 210                                 /* byteswap and process VBI data */
 211                                 cx18_process_vbi_data(cx, buf, s->type);
 212                         }
 213                         return buf;
 214                 }
 215
 216                 /* return if end of stream */
 217                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 218                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 219                         return NULL;
 220                 }
 221
 222                 /* return if file was opened with O_NONBLOCK */
 223                 if (non_block) {
 224                         *err = -EAGAIN;
 225                         return NULL;
 226                 }
 227
 228                 /* wait for more data to arrive */
 229                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 230                 /* New buffers might have become available before we were added
 231                    to the waitqueue */
 232                 if (!atomic_read(&s->q_full.buffers))
 233                         schedule();
 234                 finish_wait(&s->waitq, &wait);
 235                 if (signal_pending(current)) {
 236                         /* return if a signal was received */
 237                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 238                         *err = -EINTR;
 239                         return NULL;
 240                 }
 241         }
 242 }
 243
 244 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 245 {
 246         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 247
 248         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 249         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 250         cx->vbi.sliced_mpeg_buf.readpos = 0;
 251 }
 252
 253 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 254                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 255 {
 256         struct cx18 *cx = s->cx;
 257         size_t len = buf->bytesused - buf->readpos;
 258
 259         if (len > ucount)
 260                 len = ucount;
 261         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 262             !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
 263                 /*
 264                  * Try to find a good splice point in the PS, just before
 265                  * an MPEG-2 Program Pack start code, and provide only
 266                  * up to that point to the user, so it's easy to insert VBI data
 267                  * the next time around.
 268                  */
 269                 /* FIXME - This only works for an MPEG-2 PS, not a TS */
 270                 /*
 271                  * An MPEG-2 Program Stream (PS) is a series of
 272                  * MPEG-2 Program Packs terminated by an
 273                  * MPEG Program End Code after the last Program Pack.
 274                  * A Program Pack may hold a PS System Header packet and any
 275                  * number of Program Elementary Stream (PES) Packets
 276                  */
 277                 const char *start = buf->buf + buf->readpos;
 278                 const char *p = start + 1;
 279                 const u8 *q;
 280                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 281                 int stuffing, i;
 282
 283                 while (start + len > p) {
 284                         /* Scan for a 0 to find a potential MPEG-2 start code */
 285                         q = memchr(p, 0, start + len - p);
 286                         if (q == NULL)
 287                                 break;
 288                         p = q + 1;
 289                         /*
 290                          * Keep looking if not a
 291                          * MPEG-2 Pack header start code:  0x00 0x00 0x01 0xba
 292                          * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
 293                          */
 294                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 295                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 296                                 continue;
 297
 298                         /* If expecting the primary video PES */
 299                         if (!cx->search_pack_header) {
 300                                 /* Continue if it couldn't be a PES packet */
 301                                 if ((q[6] & 0xc0) != 0x80)
 302                                         continue;
 303                                 /* Check if a PTS or PTS & DTS follow */
 304                                 if (((q[7] & 0xc0) == 0x80 &&  /* PTS only */
 305                                      (q[9] & 0xf0) == 0x20) || /* PTS only */
 306                                     ((q[7] & 0xc0) == 0xc0 &&  /* PTS & DTS */
 307                                      (q[9] & 0xf0) == 0x30)) { /* DTS follows */
 308                                         /* Assume we found the video PES hdr */
 309                                         ch = 0xba; /* next want a Program Pack*/
 310                                         cx->search_pack_header = 1;
 311                                         p = q + 9; /* Skip this video PES hdr */
 312                                 }
 313                                 continue;
 314                         }
 315
 316                         /* We may have found a Program Pack start code */
 317
 318                         /* Get the count of stuffing bytes & verify them */
 319                         stuffing = q[13] & 7;
 320                         /* all stuffing bytes must be 0xff */
 321                         for (i = 0; i < stuffing; i++)
 322                                 if (q[14 + i] != 0xff)
 323                                         break;
 324                         if (i == stuffing && /* right number of stuffing bytes*/
 325                             (q[4] & 0xc4) == 0x44 && /* marker check */
 326                             (q[12] & 3) == 3 &&  /* marker check */
 327                             q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
 328                             q[15 + stuffing] == 0 &&
 329                             q[16 + stuffing] == 1) {
 330                                 /* We declare we actually found a Program Pack*/
 331                                 cx->search_pack_header = 0; /* expect vid PES */
 332                                 len = (char *)q - start;
 333                                 cx18_setup_sliced_vbi_buf(cx);
 334                                 break;
 335                         }
 336                 }
 337         }
 338         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 339                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 340                                 len, s->name);
 341                 return -EFAULT;
 342         }
 343         buf->readpos += len;
 344         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 345             buf != &cx->vbi.sliced_mpeg_buf)
 346                 cx->mpg_data_received += len;
 347         return len;
 348 }
 349
 350 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 351                 size_t tot_count, int non_block)
 352 {
 353         struct cx18 *cx = s->cx;
 354         size_t tot_written = 0;
 355         int single_frame = 0;
 356
 357         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 358                 /* shouldn't happen */
 359                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 360                                 s->name);
 361                 return -EIO;
 362         }
 363
 364         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 365            frames should arrive one-by-one, so make sure we never output more
 366            than one VBI frame at a time */
 367         if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
 368                 single_frame = 1;
 369
 370         for (;;) {
 371                 struct cx18_buffer *buf;
 372                 int rc;
 373
 374                 buf = cx18_get_buffer(s, non_block, &rc);
 375                 /* if there is no data available... */
 376                 if (buf == NULL) {
 377                         /* if we got data, then return that regardless */
 378                         if (tot_written)
 379                                 break;
 380                         /* EOS condition */
 381                         if (rc == 0) {
 382                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 383                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 384                                 cx18_release_stream(s);
 385                         }
 386                         /* set errno */
 387                         return rc;
 388                 }
 389
 390                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 391                                 tot_count - tot_written);
 392
 393                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 394                         if (buf->readpos == buf->bytesused)
 395                                 cx18_stream_put_buf_fw(s, buf);
 396                         else
 397                                 cx18_push(s, buf, &s->q_full);
 398                 } else if (buf->readpos == buf->bytesused) {
 399                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 400
 401                         cx->vbi.sliced_mpeg_size[idx] = 0;
 402                         cx->vbi.inserted_frame++;
 403                         cx->vbi_data_inserted += buf->bytesused;
 404                 }
 405                 if (rc < 0)
 406                         return rc;
 407                 tot_written += rc;
 408
 409                 if (tot_written == tot_count || single_frame)
 410                         break;
 411         }
 412         return tot_written;
 413 }
 414
 415 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 416                 size_t count, loff_t *pos, int non_block)
 417 {
 418         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 419         struct cx18 *cx = s->cx;
 420
 421         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 422         if (rc > 0)
 423                 pos += rc;
 424         return rc;
 425 }
 426
 427 int cx18_start_capture(struct cx18_open_id *id)
 428 {
 429         struct cx18 *cx = id->cx;
 430         struct cx18_stream *s = &cx->streams[id->type];
 431         struct cx18_stream *s_vbi;
 432
 433         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 434                 /* you cannot read from these stream types. */
 435                 return -EPERM;
 436         }
 437
 438         /* Try to claim this stream. */
 439         if (cx18_claim_stream(id, s->type))
 440                 return -EBUSY;
 441
 442         /* If capture is already in progress, then we also have to
 443            do nothing extra. */
 444         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 445             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 446                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 447                 return 0;
 448         }
 449
 450         /* Start VBI capture if required */
 451         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 452         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 453             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 454             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 455                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 456                    automatically when the MPG stream is claimed.
 457                    We only need to start the VBI capturing. */
 458                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 459                         CX18_DEBUG_WARN("VBI capture start failed\n");
 460
 461                         /* Failure, clean up and return an error */
 462                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 463                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 464                         /* also releases the associated VBI stream */
 465                         cx18_release_stream(s);
 466                         return -EIO;
 467                 }
 468                 CX18_DEBUG_INFO("VBI insertion started\n");
 469         }
 470
 471         /* Tell the card to start capturing */
 472         if (!cx18_start_v4l2_encode_stream(s)) {
 473                 /* We're done */
 474                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 475                 /* Resume a possibly paused encoder */
 476                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 477                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 478                 return 0;
 479         }
 480
 481         /* failure, clean up */
 482         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 483
 484         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 485            automatically when the MPG stream is released.
 486            We only need to stop the VBI capturing. */
 487         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 488             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 489                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 490                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 491         }
 492         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 493         cx18_release_stream(s);
 494         return -EIO;
 495 }
 496
 497 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 498                 loff_t *pos)
 499 {
 500         struct cx18_open_id *id = filp->private_data;
 501         struct cx18 *cx = id->cx;
 502         struct cx18_stream *s = &cx->streams[id->type];
 503         int rc;
 504
 505         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 506
 507         mutex_lock(&cx->serialize_lock);
 508         rc = cx18_start_capture(id);
 509         mutex_unlock(&cx->serialize_lock);
 510         if (rc)
 511                 return rc;
 512         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 513 }
 514
 515 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 516 {
 517         struct cx18_open_id *id = filp->private_data;
 518         struct cx18 *cx = id->cx;
 519         struct cx18_stream *s = &cx->streams[id->type];
 520         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 521
 522         /* Start a capture if there is none */
 523         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 524                 int rc;
 525
 526                 mutex_lock(&cx->serialize_lock);
 527                 rc = cx18_start_capture(id);
 528                 mutex_unlock(&cx->serialize_lock);
 529                 if (rc) {
 530                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 531                                         s->name, rc);
 532                         return POLLERR;
 533                 }
 534                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 535         }
 536
 537         /* add stream's waitq to the poll list */
 538         CX18_DEBUG_HI_FILE("Encoder poll\n");
 539         poll_wait(filp, &s->waitq, wait);
 540
 541         if (atomic_read(&s->q_full.buffers))
 542                 return POLLIN | POLLRDNORM;
 543         if (eof)
 544                 return POLLHUP;
 545         return 0;
 546 }
 547
 548 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 549 {
 550         struct cx18 *cx = id->cx;
 551         struct cx18_stream *s = &cx->streams[id->type];
 552
 553         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 554
 555         /* 'Unclaim' this stream */
 556
 557         /* Stop capturing */
 558         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 559                 struct cx18_stream *s_vbi =
 560                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 561
 562                 CX18_DEBUG_INFO("close stopping capture\n");
 563                 /* Special case: a running VBI capture for VBI insertion
 564                    in the mpeg stream. Need to stop that too. */
 565                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 566                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 567                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 568                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 569                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 570                 }
 571                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 572                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 573                         /* Also used internally, don't stop capturing */
 574                         s->id = -1;
 575                 else
 576                         cx18_stop_v4l2_encode_stream(s, gop_end);
 577         }
 578         if (!gop_end) {
 579                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 580                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 581                 cx18_release_stream(s);
 582         }
 583 }
 584
 585 int cx18_v4l2_close(struct file *filp)
 586 {
 587         struct cx18_open_id *id = filp->private_data;
 588         struct cx18 *cx = id->cx;
 589         struct cx18_stream *s = &cx->streams[id->type];
 590
 591         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 592
 593         v4l2_prio_close(&cx->prio, &id->prio);
 594
 595         /* Easy case first: this stream was never claimed by us */
 596         if (s->id != id->open_id) {
 597                 kfree(id);
 598                 return 0;
 599         }
 600
 601         /* 'Unclaim' this stream */
 602
 603         /* Stop radio */
 604         mutex_lock(&cx->serialize_lock);
 605         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 606                 /* Closing radio device, return to TV mode */
 607                 cx18_mute(cx);
 608                 /* Mark that the radio is no longer in use */
 609                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 610                 /* Switch tuner to TV */
 611                 cx18_call_all(cx, tuner, s_std, cx->std);
 612                 /* Select correct audio input (i.e. TV tuner or Line in) */
 613                 cx18_audio_set_io(cx);
 614                 if (atomic_read(&cx->ana_capturing) > 0) {
 615                         /* Undo video mute */
 616                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 617                                 cx->params.video_mute |
 618                                         (cx->params.video_mute_yuv << 8));
 619                 }
 620                 /* Done! Unmute and continue. */
 621                 cx18_unmute(cx);
 622                 cx18_release_stream(s);
 623         } else {
 624                 cx18_stop_capture(id, 0);
 625         }
 626         kfree(id);
 627         mutex_unlock(&cx->serialize_lock);
 628         return 0;
 629 }
 630
 631 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 632 {
 633         struct cx18 *cx = s->cx;
 634         struct cx18_open_id *item;
 635
 636         CX18_DEBUG_FILE("open %s\n", s->name);
 637
 638         /* Allocate memory */
 639         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 640         if (NULL == item) {
 641                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 642                 return -ENOMEM;
 643         }
 644         item->cx = cx;
 645         item->type = s->type;
 646         v4l2_prio_open(&cx->prio, &item->prio);
 647
 648         item->open_id = cx->open_id++;
 649         filp->private_data = item;
 650
 651         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 652                 /* Try to claim this stream */
 653                 if (cx18_claim_stream(item, item->type)) {
 654                         /* No, it's already in use */
 655                         kfree(item);
 656                         return -EBUSY;
 657                 }
 658
 659                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 660                         if (atomic_read(&cx->ana_capturing) > 0) {
 661                                 /* switching to radio while capture is
 662                                    in progress is not polite */
 663                                 cx18_release_stream(s);
 664                                 kfree(item);
 665                                 return -EBUSY;
 666                         }
 667                 }
 668
 669                 /* Mark that the radio is being used. */
 670                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 671                 /* We have the radio */
 672                 cx18_mute(cx);
 673                 /* Switch tuner to radio */
 674                 cx18_call_all(cx, tuner, s_radio);
 675                 /* Select the correct audio input (i.e. radio tuner) */
 676                 cx18_audio_set_io(cx);
 677                 /* Done! Unmute and continue. */
 678                 cx18_unmute(cx);
 679         }
 680         return 0;
 681 }
 682
 683 int cx18_v4l2_open(struct file *filp)
 684 {
 685         int res;
 686         struct video_device *video_dev = video_devdata(filp);
 687         struct cx18_stream *s = video_get_drvdata(video_dev);
 688         struct cx18 *cx = s->cx;;
 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",
 693                          video_dev->minor);
 694                 mutex_unlock(&cx->serialize_lock);
 695                 return -ENXIO;
 696         }
 697         res = cx18_serialized_open(s, filp);
 698         mutex_unlock(&cx->serialize_lock);
 699         return res;
 700 }
 701
 702 void cx18_mute(struct cx18 *cx)
 703 {
 704         u32 h;
 705         if (atomic_read(&cx->ana_capturing)) {
 706                 h = cx18_find_handle(cx);
 707                 if (h != CX18_INVALID_TASK_HANDLE)
 708                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 709                 else
 710                         CX18_ERR("Can't find valid task handle for mute\n");
 711         }
 712         CX18_DEBUG_INFO("Mute\n");
 713 }
 714
 715 void cx18_unmute(struct cx18 *cx)
 716 {
 717         u32 h;
 718         if (atomic_read(&cx->ana_capturing)) {
 719                 h = cx18_find_handle(cx);
 720                 if (h != CX18_INVALID_TASK_HANDLE) {
 721                         cx18_msleep_timeout(100, 0);
 722                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 723                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 724                 } else
 725                         CX18_ERR("Can't find valid task handle for unmute\n");
 726         }
 727         CX18_DEBUG_INFO("Unmute\n");
 728 }