SAFE public projects git trees. - safe/jmp/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_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 leftover data? */
 199                 buf = cx18_dequeue(s, &s->q_io);
 200                 if (buf)
 201                         return buf;
 202
 203                 /* do we have new data? */
 204                 buf = cx18_dequeue(s, &s->q_full);
 205                 if (buf) {
 206                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 207                                                 &buf->b_flags))
 208                                 return buf;
 209                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 210                                 /* byteswap MPG data */
 211                                 cx18_buf_swap(buf);
 212                         else {
 213                                 /* byteswap and process VBI data */
 214                                 cx18_process_vbi_data(cx, buf,
 215                                                 s->dma_pts, s->type);
 216                         }
 217                         return buf;
 218                 }
 219
 220                 /* return if end of stream */
 221                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 222                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 223                         return NULL;
 224                 }
 225
 226                 /* return if file was opened with O_NONBLOCK */
 227                 if (non_block) {
 228                         *err = -EAGAIN;
 229                         return NULL;
 230                 }
 231
 232                 /* wait for more data to arrive */
 233                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 234                 /* New buffers might have become available before we were added
 235                    to the waitqueue */
 236                 if (!atomic_read(&s->q_full.buffers))
 237                         schedule();
 238                 finish_wait(&s->waitq, &wait);
 239                 if (signal_pending(current)) {
 240                         /* return if a signal was received */
 241                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 242                         *err = -EINTR;
 243                         return NULL;
 244                 }
 245         }
 246 }
 247
 248 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 249 {
 250         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 251
 252         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 253         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 254         cx->vbi.sliced_mpeg_buf.readpos = 0;
 255 }
 256
 257 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 258                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 259 {
 260         struct cx18 *cx = s->cx;
 261         size_t len = buf->bytesused - buf->readpos;
 262
 263         if (len > ucount)
 264                 len = ucount;
 265         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 266             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
 267                 const char *start = buf->buf + buf->readpos;
 268                 const char *p = start + 1;
 269                 const u8 *q;
 270                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 271                 int stuffing, i;
 272
 273                 while (start + len > p) {
 274                         q = memchr(p, 0, start + len - p);
 275                         if (q == NULL)
 276                                 break;
 277                         p = q + 1;
 278                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 279                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 280                                 continue;
 281                         if (!cx->search_pack_header) {
 282                                 if ((q[6] & 0xc0) != 0x80)
 283                                         continue;
 284                                 if (((q[7] & 0xc0) == 0x80 &&
 285                                      (q[9] & 0xf0) == 0x20) ||
 286                                     ((q[7] & 0xc0) == 0xc0 &&
 287                                      (q[9] & 0xf0) == 0x30)) {
 288                                         ch = 0xba;
 289                                         cx->search_pack_header = 1;
 290                                         p = q + 9;
 291                                 }
 292                                 continue;
 293                         }
 294                         stuffing = q[13] & 7;
 295                         /* all stuffing bytes must be 0xff */
 296                         for (i = 0; i < stuffing; i++)
 297                                 if (q[14 + i] != 0xff)
 298                                         break;
 299                         if (i == stuffing &&
 300                             (q[4] & 0xc4) == 0x44 &&
 301                             (q[12] & 3) == 3 &&
 302                             q[14 + stuffing] == 0 &&
 303                             q[15 + stuffing] == 0 &&
 304                             q[16 + stuffing] == 1) {
 305                                 cx->search_pack_header = 0;
 306                                 len = (char *)q - start;
 307                                 cx18_setup_sliced_vbi_buf(cx);
 308                                 break;
 309                         }
 310                 }
 311         }
 312         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 313                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 314                                 len, s->name);
 315                 return -EFAULT;
 316         }
 317         buf->readpos += len;
 318         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 319             buf != &cx->vbi.sliced_mpeg_buf)
 320                 cx->mpg_data_received += len;
 321         return len;
 322 }
 323
 324 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 325                 size_t tot_count, int non_block)
 326 {
 327         struct cx18 *cx = s->cx;
 328         size_t tot_written = 0;
 329         int single_frame = 0;
 330
 331         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 332                 /* shouldn't happen */
 333                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 334                                 s->name);
 335                 return -EIO;
 336         }
 337
 338         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 339            frames should arrive one-by-one, so make sure we never output more
 340            than one VBI frame at a time */
 341         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
 342             cx->vbi.sliced_in->service_set)
 343                 single_frame = 1;
 344
 345         for (;;) {
 346                 struct cx18_buffer *buf;
 347                 int rc;
 348
 349                 buf = cx18_get_buffer(s, non_block, &rc);
 350                 /* if there is no data available... */
 351                 if (buf == NULL) {
 352                         /* if we got data, then return that regardless */
 353                         if (tot_written)
 354                                 break;
 355                         /* EOS condition */
 356                         if (rc == 0) {
 357                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 358                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 359                                 cx18_release_stream(s);
 360                         }
 361                         /* set errno */
 362                         return rc;
 363                 }
 364
 365                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 366                                 tot_count - tot_written);
 367
 368                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 369                         if (buf->readpos == buf->bytesused) {
 370                                 cx18_buf_sync_for_device(s, buf);
 371                                 cx18_enqueue(s, buf, &s->q_free);
 372                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
 373                                         s->handle,
 374                                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] -
 375                                           cx->enc_mem,
 376                                         1, buf->id, s->buf_size);
 377                         } else
 378                                 cx18_enqueue(s, buf, &s->q_io);
 379                 } else if (buf->readpos == buf->bytesused) {
 380                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 381
 382                         cx->vbi.sliced_mpeg_size[idx] = 0;
 383                         cx->vbi.inserted_frame++;
 384                         cx->vbi_data_inserted += buf->bytesused;
 385                 }
 386                 if (rc < 0)
 387                         return rc;
 388                 tot_written += rc;
 389
 390                 if (tot_written == tot_count || single_frame)
 391                         break;
 392         }
 393         return tot_written;
 394 }
 395
 396 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 397                 size_t count, loff_t *pos, int non_block)
 398 {
 399         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 400         struct cx18 *cx = s->cx;
 401
 402         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 403         if (rc > 0)
 404                 pos += rc;
 405         return rc;
 406 }
 407
 408 int cx18_start_capture(struct cx18_open_id *id)
 409 {
 410         struct cx18 *cx = id->cx;
 411         struct cx18_stream *s = &cx->streams[id->type];
 412         struct cx18_stream *s_vbi;
 413
 414         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 415                 /* you cannot read from these stream types. */
 416                 return -EPERM;
 417         }
 418
 419         /* Try to claim this stream. */
 420         if (cx18_claim_stream(id, s->type))
 421                 return -EBUSY;
 422
 423         /* If capture is already in progress, then we also have to
 424            do nothing extra. */
 425         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 426             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 427                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 428                 return 0;
 429         }
 430
 431         /* Start VBI capture if required */
 432         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 433         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 434             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 435             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 436                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 437                    automatically when the MPG stream is claimed.
 438                    We only need to start the VBI capturing. */
 439                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 440                         CX18_DEBUG_WARN("VBI capture start failed\n");
 441
 442                         /* Failure, clean up and return an error */
 443                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 444                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 445                         /* also releases the associated VBI stream */
 446                         cx18_release_stream(s);
 447                         return -EIO;
 448                 }
 449                 CX18_DEBUG_INFO("VBI insertion started\n");
 450         }
 451
 452         /* Tell the card to start capturing */
 453         if (!cx18_start_v4l2_encode_stream(s)) {
 454                 /* We're done */
 455                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 456                 /* Resume a possibly paused encoder */
 457                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 458                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 459                 return 0;
 460         }
 461
 462         /* failure, clean up */
 463         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 464
 465         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 466            automatically when the MPG stream is released.
 467            We only need to stop the VBI capturing. */
 468         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 469             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 470                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 471                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 472         }
 473         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 474         cx18_release_stream(s);
 475         return -EIO;
 476 }
 477
 478 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 479                 loff_t *pos)
 480 {
 481         struct cx18_open_id *id = filp->private_data;
 482         struct cx18 *cx = id->cx;
 483         struct cx18_stream *s = &cx->streams[id->type];
 484         int rc;
 485
 486         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 487
 488         mutex_lock(&cx->serialize_lock);
 489         rc = cx18_start_capture(id);
 490         mutex_unlock(&cx->serialize_lock);
 491         if (rc)
 492                 return rc;
 493         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 494 }
 495
 496 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 497 {
 498         struct cx18_open_id *id = filp->private_data;
 499         struct cx18 *cx = id->cx;
 500         struct cx18_stream *s = &cx->streams[id->type];
 501         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 502
 503         /* Start a capture if there is none */
 504         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 505                 int rc;
 506
 507                 mutex_lock(&cx->serialize_lock);
 508                 rc = cx18_start_capture(id);
 509                 mutex_unlock(&cx->serialize_lock);
 510                 if (rc) {
 511                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 512                                         s->name, rc);
 513                         return POLLERR;
 514                 }
 515                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 516         }
 517
 518         /* add stream's waitq to the poll list */
 519         CX18_DEBUG_HI_FILE("Encoder poll\n");
 520         poll_wait(filp, &s->waitq, wait);
 521
 522         if (atomic_read(&s->q_full.buffers) || atomic_read(&s->q_io.buffers))
 523                 return POLLIN | POLLRDNORM;
 524         if (eof)
 525                 return POLLHUP;
 526         return 0;
 527 }
 528
 529 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 530 {
 531         struct cx18 *cx = id->cx;
 532         struct cx18_stream *s = &cx->streams[id->type];
 533
 534         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 535
 536         /* 'Unclaim' this stream */
 537
 538         /* Stop capturing */
 539         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 540                 struct cx18_stream *s_vbi =
 541                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 542
 543                 CX18_DEBUG_INFO("close stopping capture\n");
 544                 /* Special case: a running VBI capture for VBI insertion
 545                    in the mpeg stream. Need to stop that too. */
 546                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 547                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 548                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 549                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 550                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 551                 }
 552                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 553                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 554                         /* Also used internally, don't stop capturing */
 555                         s->id = -1;
 556                 else
 557                         cx18_stop_v4l2_encode_stream(s, gop_end);
 558         }
 559         if (!gop_end) {
 560                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 561                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 562                 cx18_release_stream(s);
 563         }
 564 }
 565
 566 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 567 {
 568         struct cx18_open_id *id = filp->private_data;
 569         struct cx18 *cx = id->cx;
 570         struct cx18_stream *s = &cx->streams[id->type];
 571
 572         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 573
 574         v4l2_prio_close(&cx->prio, &id->prio);
 575
 576         /* Easy case first: this stream was never claimed by us */
 577         if (s->id != id->open_id) {
 578                 kfree(id);
 579                 return 0;
 580         }
 581
 582         /* 'Unclaim' this stream */
 583
 584         /* Stop radio */
 585         mutex_lock(&cx->serialize_lock);
 586         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 587                 /* Closing radio device, return to TV mode */
 588                 cx18_mute(cx);
 589                 /* Mark that the radio is no longer in use */
 590                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 591                 /* Switch tuner to TV */
 592                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 593                 /* Select correct audio input (i.e. TV tuner or Line in) */
 594                 cx18_audio_set_io(cx);
 595                 if (atomic_read(&cx->ana_capturing) > 0) {
 596                         /* Undo video mute */
 597                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 598                                 cx->params.video_mute |
 599                                         (cx->params.video_mute_yuv << 8));
 600                 }
 601                 /* Done! Unmute and continue. */
 602                 cx18_unmute(cx);
 603                 cx18_release_stream(s);
 604         } else {
 605                 cx18_stop_capture(id, 0);
 606         }
 607         kfree(id);
 608         mutex_unlock(&cx->serialize_lock);
 609         return 0;
 610 }
 611
 612 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 613 {
 614         struct cx18 *cx = s->cx;
 615         struct cx18_open_id *item;
 616
 617         CX18_DEBUG_FILE("open %s\n", s->name);
 618
 619         /* Allocate memory */
 620         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 621         if (NULL == item) {
 622                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 623                 return -ENOMEM;
 624         }
 625         item->cx = cx;
 626         item->type = s->type;
 627         v4l2_prio_open(&cx->prio, &item->prio);
 628
 629         item->open_id = cx->open_id++;
 630         filp->private_data = item;
 631
 632         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 633                 /* Try to claim this stream */
 634                 if (cx18_claim_stream(item, item->type)) {
 635                         /* No, it's already in use */
 636                         kfree(item);
 637                         return -EBUSY;
 638                 }
 639
 640                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 641                         if (atomic_read(&cx->ana_capturing) > 0) {
 642                                 /* switching to radio while capture is
 643                                    in progress is not polite */
 644                                 cx18_release_stream(s);
 645                                 kfree(item);
 646                                 return -EBUSY;
 647                         }
 648                 }
 649
 650                 /* Mark that the radio is being used. */
 651                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 652                 /* We have the radio */
 653                 cx18_mute(cx);
 654                 /* Switch tuner to radio */
 655                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 656                 /* Select the correct audio input (i.e. radio tuner) */
 657                 cx18_audio_set_io(cx);
 658                 /* Done! Unmute and continue. */
 659                 cx18_unmute(cx);
 660         }
 661         return 0;
 662 }
 663
 664 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 665 {
 666         int res, x, y = 0;
 667         struct cx18 *cx = NULL;
 668         struct cx18_stream *s = NULL;
 669         int minor = iminor(inode);
 670
 671         /* Find which card this open was on */
 672         spin_lock(&cx18_cards_lock);
 673         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 674                 /* find out which stream this open was on */
 675                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 676                         if (cx18_cards[x] == NULL)
 677                                 continue;
 678                         s = &cx18_cards[x]->streams[y];
 679                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 680                                 cx = cx18_cards[x];
 681                                 break;
 682                         }
 683                 }
 684         }
 685         spin_unlock(&cx18_cards_lock);
 686
 687         if (cx == NULL) {
 688                 /* Couldn't find a device registered
 689                    on that minor, shouldn't happen! */
 690                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
 691                                 minor);
 692                 return -ENXIO;
 693         }
 694
 695         mutex_lock(&cx->serialize_lock);
 696         if (cx18_init_on_first_open(cx)) {
 697                 CX18_ERR("Failed to initialize on minor %d\n", minor);
 698                 mutex_unlock(&cx->serialize_lock);
 699                 return -ENXIO;
 700         }
 701         res = cx18_serialized_open(s, filp);
 702         mutex_unlock(&cx->serialize_lock);
 703         return res;
 704 }
 705
 706 void cx18_mute(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_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 713                 else
 714                         CX18_ERR("Can't find valid task handle for mute\n");
 715         }
 716         CX18_DEBUG_INFO("Mute\n");
 717 }
 718
 719 void cx18_unmute(struct cx18 *cx)
 720 {
 721         u32 h;
 722         if (atomic_read(&cx->ana_capturing)) {
 723                 h = cx18_find_handle(cx);
 724                 if (h != CX18_INVALID_TASK_HANDLE) {
 725                         cx18_msleep_timeout(100, 0);
 726                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 727                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 728                 } else
 729                         CX18_ERR("Can't find valid task handle for unmute\n");
 730         }
 731         CX18_DEBUG_INFO("Unmute\n");
 732 }