drivers/media/video/cx18/cx18-fileops.c

   1 /*
   2  *  cx18 file operation functions
   3  *
   4  *  Derived from ivtv-fileops.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-fileops.h"
  26 #include "cx18-i2c.h"
  27 #include "cx18-queue.h"
  28 #include "cx18-vbi.h"
  29 #include "cx18-audio.h"
  30 #include "cx18-mailbox.h"
  31 #include "cx18-scb.h"
  32 #include "cx18-streams.h"
  33 #include "cx18-controls.h"
  34 #include "cx18-ioctl.h"
  35 #include "cx18-cards.h"
  36
  37 /* This function tries to claim the stream for a specific file descriptor.
  38    If no one else is using this stream then the stream is claimed and
  39    associated VBI streams are also automatically claimed.
  40    Possible error returns: -EBUSY if someone else has claimed
  41    the stream or 0 on success. */
  42 static int cx18_claim_stream(struct cx18_open_id *id, int type)
  43 {
  44         struct cx18 *cx = id->cx;
  45         struct cx18_stream *s = &cx->streams[type];
  46         struct cx18_stream *s_vbi;
  47         int vbi_type;
  48
  49         if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
  50                 /* someone already claimed this stream */
  51                 if (s->id == id->open_id) {
  52                         /* yes, this file descriptor did. So that's OK. */
  53                         return 0;
  54                 }
  55                 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
  56                         /* VBI is handled already internally, now also assign
  57                            the file descriptor to this stream for external
  58                            reading of the stream. */
  59                         s->id = id->open_id;
  60                         CX18_DEBUG_INFO("Start Read VBI\n");
  61                         return 0;
  62                 }
  63                 /* someone else is using this stream already */
  64                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
  65                 return -EBUSY;
  66         }
  67         s->id = id->open_id;
  68
  69         /* CX18_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI,
  70            CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
  71            (provided VBI insertion is on and sliced VBI is selected), for all
  72            other streams we're done */
  73         if (type == CX18_ENC_STREAM_TYPE_MPG &&
  74                    cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) {
  75                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
  76         } else {
  77                 return 0;
  78         }
  79         s_vbi = &cx->streams[vbi_type];
  80
  81         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
  82
  83         /* mark that it is used internally */
  84         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
  85         return 0;
  86 }
  87
  88 /* This function releases a previously claimed stream. It will take into
  89    account associated VBI streams. */
  90 static void cx18_release_stream(struct cx18_stream *s)
  91 {
  92         struct cx18 *cx = s->cx;
  93         struct cx18_stream *s_vbi;
  94
  95         s->id = -1;
  96         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
  97                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
  98                 /* this stream is still in use internally */
  99                 return;
 100         }
 101         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
 102                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 103                 return;
 104         }
 105
 106         cx18_flush_queues(s);
 107
 108         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
 109            for all other streams we're done */
 110         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 111                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 112         else
 113                 return;
 114
 115         /* clear internal use flag */
 116         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 117                 /* was already cleared */
 118                 return;
 119         }
 120         if (s_vbi->id != -1) {
 121                 /* VBI stream still claimed by a file descriptor */
 122                 return;
 123         }
 124         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
 125         cx18_flush_queues(s_vbi);
 126 }
 127
 128 static void cx18_dualwatch(struct cx18 *cx)
 129 {
 130         struct v4l2_tuner vt;
 131         u16 new_bitmap;
 132         u16 new_stereo_mode;
 133         const u16 stereo_mask = 0x0300;
 134         const u16 dual = 0x0200;
 135
 136         new_stereo_mode = cx->params.audio_properties & stereo_mask;
 137         memset(&vt, 0, sizeof(vt));
 138         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
 139         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
 140                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 141                 new_stereo_mode = dual;
 142
 143         if (new_stereo_mode == cx->dualwatch_stereo_mode)
 144                 return;
 145
 146         new_bitmap = new_stereo_mode | (cx->params.audio_properties & ~stereo_mask);
 147
 148         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 149                            cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 150
 151         if (cx18_vapi(cx, CX18_CPU_SET_AUDIO_PARAMETERS, 2,
 152                                 cx18_find_handle(cx), new_bitmap) == 0) {
 153                 cx->dualwatch_stereo_mode = new_stereo_mode;
 154                 return;
 155         }
 156         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 157 }
 158
 159
 160 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
 161 {
 162         struct cx18 *cx = s->cx;
 163         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 164         struct cx18_buffer *buf;
 165         DEFINE_WAIT(wait);
 166
 167         *err = 0;
 168         while (1) {
 169                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 170
 171                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 172                                 cx->dualwatch_jiffies = jiffies;
 173                                 cx18_dualwatch(cx);
 174                         }
 175                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 176                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 177                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 178                                         /* byteswap and process VBI data */
 179 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
 180                                         cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
 181                                 }
 182                         }
 183                         buf = &cx->vbi.sliced_mpeg_buf;
 184                         if (buf->readpos != buf->bytesused)
 185                                 return buf;
 186                 }
 187
 188                 /* do we have leftover data? */
 189                 buf = cx18_dequeue(s, &s->q_io);
 190                 if (buf)
 191                         return buf;
 192
 193                 /* do we have new data? */
 194                 buf = cx18_dequeue(s, &s->q_full);
 195                 if (buf) {
 196                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 197                                                 &buf->b_flags))
 198                                 return buf;
 199                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 200                                 /* byteswap MPG data */
 201                                 cx18_buf_swap(buf);
 202                         else {
 203                                 /* byteswap and process VBI data */
 204                                 cx18_process_vbi_data(cx, buf,
 205                                                 s->dma_pts, s->type);
 206                         }
 207                         return buf;
 208                 }
 209
 210                 /* return if end of stream */
 211                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 212                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 213                         return NULL;
 214                 }
 215
 216                 /* return if file was opened with O_NONBLOCK */
 217                 if (non_block) {
 218                         *err = -EAGAIN;
 219                         return NULL;
 220                 }
 221
 222                 /* wait for more data to arrive */
 223                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 224                 /* New buffers might have become available before we were added
 225                    to the waitqueue */
 226                 if (!s->q_full.buffers)
 227                         schedule();
 228                 finish_wait(&s->waitq, &wait);
 229                 if (signal_pending(current)) {
 230                         /* return if a signal was received */
 231                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 232                         *err = -EINTR;
 233                         return NULL;
 234                 }
 235         }
 236 }
 237
 238 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 239 {
 240         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 241
 242         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 243         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 244         cx->vbi.sliced_mpeg_buf.readpos = 0;
 245 }
 246
 247 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 248                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 249 {
 250         struct cx18 *cx = s->cx;
 251         size_t len = buf->bytesused - buf->readpos;
 252
 253         if (len > ucount)
 254                 len = ucount;
 255         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 256             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
 257                 const char *start = buf->buf + buf->readpos;
 258                 const char *p = start + 1;
 259                 const u8 *q;
 260                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 261                 int stuffing, i;
 262
 263                 while (start + len > p) {
 264                         q = memchr(p, 0, start + len - p);
 265                         if (q == NULL)
 266                                 break;
 267                         p = q + 1;
 268                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 269                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 270                                 continue;
 271                         if (!cx->search_pack_header) {
 272                                 if ((q[6] & 0xc0) != 0x80)
 273                                         continue;
 274                                 if (((q[7] & 0xc0) == 0x80 &&
 275                                      (q[9] & 0xf0) == 0x20) ||
 276                                     ((q[7] & 0xc0) == 0xc0 &&
 277                                      (q[9] & 0xf0) == 0x30)) {
 278                                         ch = 0xba;
 279                                         cx->search_pack_header = 1;
 280                                         p = q + 9;
 281                                 }
 282                                 continue;
 283                         }
 284                         stuffing = q[13] & 7;
 285                         /* all stuffing bytes must be 0xff */
 286                         for (i = 0; i < stuffing; i++)
 287                                 if (q[14 + i] != 0xff)
 288                                         break;
 289                         if (i == stuffing &&
 290                             (q[4] & 0xc4) == 0x44 &&
 291                             (q[12] & 3) == 3 &&
 292                             q[14 + stuffing] == 0 &&
 293                             q[15 + stuffing] == 0 &&
 294                             q[16 + stuffing] == 1) {
 295                                 cx->search_pack_header = 0;
 296                                 len = (char *)q - start;
 297                                 cx18_setup_sliced_vbi_buf(cx);
 298                                 break;
 299                         }
 300                 }
 301         }
 302         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 303                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 304                                 len, s->name);
 305                 return -EFAULT;
 306         }
 307         buf->readpos += len;
 308         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 309             buf != &cx->vbi.sliced_mpeg_buf)
 310                 cx->mpg_data_received += len;
 311         return len;
 312 }
 313
 314 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 315                 size_t tot_count, int non_block)
 316 {
 317         struct cx18 *cx = s->cx;
 318         size_t tot_written = 0;
 319         int single_frame = 0;
 320
 321         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 322                 /* shouldn't happen */
 323                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 324                                 s->name);
 325                 return -EIO;
 326         }
 327
 328         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 329            frames should arrive one-by-one, so make sure we never output more
 330            than one VBI frame at a time */
 331         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
 332             cx->vbi.sliced_in->service_set)
 333                 single_frame = 1;
 334
 335         for (;;) {
 336                 struct cx18_buffer *buf;
 337                 int rc;
 338
 339                 buf = cx18_get_buffer(s, non_block, &rc);
 340                 /* if there is no data available... */
 341                 if (buf == NULL) {
 342                         /* if we got data, then return that regardless */
 343                         if (tot_written)
 344                                 break;
 345                         /* EOS condition */
 346                         if (rc == 0) {
 347                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 348                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 349                                 cx18_release_stream(s);
 350                         }
 351                         /* set errno */
 352                         return rc;
 353                 }
 354
 355                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 356                                 tot_count - tot_written);
 357
 358                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 359                         if (buf->readpos == buf->bytesused) {
 360                                 cx18_buf_sync_for_device(s, buf);
 361                                 cx18_enqueue(s, buf, &s->q_free);
 362                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
 363                                         s->handle,
 364                                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] -
 365                                           cx->enc_mem,
 366                                         1, buf->id, s->buf_size);
 367                         } else
 368                                 cx18_enqueue(s, buf, &s->q_io);
 369                 } else if (buf->readpos == buf->bytesused) {
 370                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 371
 372                         cx->vbi.sliced_mpeg_size[idx] = 0;
 373                         cx->vbi.inserted_frame++;
 374                         cx->vbi_data_inserted += buf->bytesused;
 375                 }
 376                 if (rc < 0)
 377                         return rc;
 378                 tot_written += rc;
 379
 380                 if (tot_written == tot_count || single_frame)
 381                         break;
 382         }
 383         return tot_written;
 384 }
 385
 386 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 387                 size_t count, loff_t *pos, int non_block)
 388 {
 389         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 390         struct cx18 *cx = s->cx;
 391
 392         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 393         if (rc > 0)
 394                 pos += rc;
 395         return rc;
 396 }
 397
 398 int cx18_start_capture(struct cx18_open_id *id)
 399 {
 400         struct cx18 *cx = id->cx;
 401         struct cx18_stream *s = &cx->streams[id->type];
 402         struct cx18_stream *s_vbi;
 403
 404         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 405                 /* you cannot read from these stream types. */
 406                 return -EPERM;
 407         }
 408
 409         /* Try to claim this stream. */
 410         if (cx18_claim_stream(id, s->type))
 411                 return -EBUSY;
 412
 413         /* If capture is already in progress, then we also have to
 414            do nothing extra. */
 415         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 416             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 417                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 418                 return 0;
 419         }
 420
 421         /* Start VBI capture if required */
 422         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 423         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 424             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 425             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 426                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 427                    automatically when the MPG stream is claimed.
 428                    We only need to start the VBI capturing. */
 429                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 430                         CX18_DEBUG_WARN("VBI capture start failed\n");
 431
 432                         /* Failure, clean up and return an error */
 433                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 434                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 435                         /* also releases the associated VBI stream */
 436                         cx18_release_stream(s);
 437                         return -EIO;
 438                 }
 439                 CX18_DEBUG_INFO("VBI insertion started\n");
 440         }
 441
 442         /* Tell the card to start capturing */
 443         if (!cx18_start_v4l2_encode_stream(s)) {
 444                 /* We're done */
 445                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 446                 /* Resume a possibly paused encoder */
 447                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 448                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 449                 return 0;
 450         }
 451
 452         /* failure, clean up */
 453         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 454
 455         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 456            automatically when the MPG stream is released.
 457            We only need to stop the VBI capturing. */
 458         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 459             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 460                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 461                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 462         }
 463         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 464         cx18_release_stream(s);
 465         return -EIO;
 466 }
 467
 468 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 469                 loff_t *pos)
 470 {
 471         struct cx18_open_id *id = filp->private_data;
 472         struct cx18 *cx = id->cx;
 473         struct cx18_stream *s = &cx->streams[id->type];
 474         int rc;
 475
 476         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 477
 478         mutex_lock(&cx->serialize_lock);
 479         rc = cx18_start_capture(id);
 480         mutex_unlock(&cx->serialize_lock);
 481         if (rc)
 482                 return rc;
 483         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 484 }
 485
 486 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 487 {
 488         struct cx18_open_id *id = filp->private_data;
 489         struct cx18 *cx = id->cx;
 490         struct cx18_stream *s = &cx->streams[id->type];
 491         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 492
 493         /* Start a capture if there is none */
 494         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 495                 int rc;
 496
 497                 mutex_lock(&cx->serialize_lock);
 498                 rc = cx18_start_capture(id);
 499                 mutex_unlock(&cx->serialize_lock);
 500                 if (rc) {
 501                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 502                                         s->name, rc);
 503                         return POLLERR;
 504                 }
 505                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 506         }
 507
 508         /* add stream's waitq to the poll list */
 509         CX18_DEBUG_HI_FILE("Encoder poll\n");
 510         poll_wait(filp, &s->waitq, wait);
 511
 512         if (s->q_full.length || s->q_io.length)
 513                 return POLLIN | POLLRDNORM;
 514         if (eof)
 515                 return POLLHUP;
 516         return 0;
 517 }
 518
 519 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 520 {
 521         struct cx18 *cx = id->cx;
 522         struct cx18_stream *s = &cx->streams[id->type];
 523
 524         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 525
 526         /* 'Unclaim' this stream */
 527
 528         /* Stop capturing */
 529         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 530                 struct cx18_stream *s_vbi =
 531                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 532
 533                 CX18_DEBUG_INFO("close stopping capture\n");
 534                 /* Special case: a running VBI capture for VBI insertion
 535                    in the mpeg stream. Need to stop that too. */
 536                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 537                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 538                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 539                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 540                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 541                 }
 542                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 543                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 544                         /* Also used internally, don't stop capturing */
 545                         s->id = -1;
 546                 else
 547                         cx18_stop_v4l2_encode_stream(s, gop_end);
 548         }
 549         if (!gop_end) {
 550                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 551                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 552                 cx18_release_stream(s);
 553         }
 554 }
 555
 556 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 557 {
 558         struct cx18_open_id *id = filp->private_data;
 559         struct cx18 *cx = id->cx;
 560         struct cx18_stream *s = &cx->streams[id->type];
 561
 562         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 563
 564         v4l2_prio_close(&cx->prio, &id->prio);
 565
 566         /* Easy case first: this stream was never claimed by us */
 567         if (s->id != id->open_id) {
 568                 kfree(id);
 569                 return 0;
 570         }
 571
 572         /* 'Unclaim' this stream */
 573
 574         /* Stop radio */
 575         mutex_lock(&cx->serialize_lock);
 576         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 577                 /* Closing radio device, return to TV mode */
 578                 cx18_mute(cx);
 579                 /* Mark that the radio is no longer in use */
 580                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 581                 /* Switch tuner to TV */
 582                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 583                 /* Select correct audio input (i.e. TV tuner or Line in) */
 584                 cx18_audio_set_io(cx);
 585                 if (atomic_read(&cx->ana_capturing) > 0) {
 586                         /* Undo video mute */
 587                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 588                                 cx->params.video_mute |
 589                                         (cx->params.video_mute_yuv << 8));
 590                 }
 591                 /* Done! Unmute and continue. */
 592                 cx18_unmute(cx);
 593                 cx18_release_stream(s);
 594         } else {
 595                 cx18_stop_capture(id, 0);
 596         }
 597         kfree(id);
 598         mutex_unlock(&cx->serialize_lock);
 599         return 0;
 600 }
 601
 602 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 603 {
 604         struct cx18 *cx = s->cx;
 605         struct cx18_open_id *item;
 606
 607         CX18_DEBUG_FILE("open %s\n", s->name);
 608
 609         /* Allocate memory */
 610         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 611         if (NULL == item) {
 612                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 613                 return -ENOMEM;
 614         }
 615         item->cx = cx;
 616         item->type = s->type;
 617         v4l2_prio_open(&cx->prio, &item->prio);
 618
 619         item->open_id = cx->open_id++;
 620         filp->private_data = item;
 621
 622         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 623                 /* Try to claim this stream */
 624                 if (cx18_claim_stream(item, item->type)) {
 625                         /* No, it's already in use */
 626                         kfree(item);
 627                         return -EBUSY;
 628                 }
 629
 630                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 631                         if (atomic_read(&cx->ana_capturing) > 0) {
 632                                 /* switching to radio while capture is
 633                                    in progress is not polite */
 634                                 cx18_release_stream(s);
 635                                 kfree(item);
 636                                 return -EBUSY;
 637                         }
 638                 }
 639
 640                 /* Mark that the radio is being used. */
 641                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 642                 /* We have the radio */
 643                 cx18_mute(cx);
 644                 /* Switch tuner to radio */
 645                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 646                 /* Select the correct audio input (i.e. radio tuner) */
 647                 cx18_audio_set_io(cx);
 648                 /* Done! Unmute and continue. */
 649                 cx18_unmute(cx);
 650         }
 651         return 0;
 652 }
 653
 654 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 655 {
 656         int res, x, y = 0;
 657         struct cx18 *cx = NULL;
 658         struct cx18_stream *s = NULL;
 659         int minor = iminor(inode);
 660
 661         /* Find which card this open was on */
 662         spin_lock(&cx18_cards_lock);
 663         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 664                 /* find out which stream this open was on */
 665                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 666                         if (cx18_cards[x] == NULL)
 667                                 continue;
 668                         s = &cx18_cards[x]->streams[y];
 669                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 670                                 cx = cx18_cards[x];
 671                                 break;
 672                         }
 673                 }
 674         }
 675         spin_unlock(&cx18_cards_lock);
 676
 677         if (cx == NULL) {
 678                 /* Couldn't find a device registered
 679                    on that minor, shouldn't happen! */
 680                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
 681                                 minor);
 682                 return -ENXIO;
 683         }
 684
 685         mutex_lock(&cx->serialize_lock);
 686         if (cx18_init_on_first_open(cx)) {
 687                 CX18_ERR("Failed to initialize on minor %d\n", minor);
 688                 mutex_unlock(&cx->serialize_lock);
 689                 return -ENXIO;
 690         }
 691         res = cx18_serialized_open(s, filp);
 692         mutex_unlock(&cx->serialize_lock);
 693         return res;
 694 }
 695
 696 void cx18_mute(struct cx18 *cx)
 697 {
 698         if (atomic_read(&cx->ana_capturing))
 699                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
 700                                 cx18_find_handle(cx), 1);
 701         CX18_DEBUG_INFO("Mute\n");
 702 }
 703
 704 void cx18_unmute(struct cx18 *cx)
 705 {
 706         if (atomic_read(&cx->ana_capturing)) {
 707                 cx18_msleep_timeout(100, 0);
 708                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2,
 709                                 cx18_find_handle(cx), 12);
 710                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
 711                                 cx18_find_handle(cx), 0);
 712         }
 713         CX18_DEBUG_INFO("Unmute\n");
 714 }