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_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
 170                                      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_mdl *mdl;
 175         DEFINE_WAIT(wait);
 176
 177         *err = 0;
 178         while (1) {
 179                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 180                         /* Process pending program info updates and pending
 181                            VBI data */
 182
 183                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 184                                 cx->dualwatch_jiffies = jiffies;
 185                                 cx18_dualwatch(cx);
 186                         }
 187                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 188                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 189                                 while ((mdl = cx18_dequeue(s_vbi,
 190                                                            &s_vbi->q_full))) {
 191                                         /* byteswap and process VBI data */
 192                                         cx18_process_vbi_data(cx, mdl,
 193                                                               s_vbi->type);
 194                                         cx18_stream_put_mdl_fw(s_vbi, mdl);
 195                                 }
 196                         }
 197                         mdl = &cx->vbi.sliced_mpeg_mdl;
 198                         if (mdl->readpos != mdl->bytesused)
 199                                 return mdl;
 200                 }
 201
 202                 /* do we have new data? */
 203                 mdl = cx18_dequeue(s, &s->q_full);
 204                 if (mdl) {
 205                         if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
 206                                                 &mdl->m_flags))
 207                                 return mdl;
 208                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 209                                 /* byteswap MPG data */
 210                                 cx18_mdl_swap(mdl);
 211                         else {
 212                                 /* byteswap and process VBI data */
 213                                 cx18_process_vbi_data(cx, mdl, s->type);
 214                         }
 215                         return mdl;
 216                 }
 217
 218                 /* return if end of stream */
 219                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 220                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 221                         return NULL;
 222                 }
 223
 224                 /* return if file was opened with O_NONBLOCK */
 225                 if (non_block) {
 226                         *err = -EAGAIN;
 227                         return NULL;
 228                 }
 229
 230                 /* wait for more data to arrive */
 231                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 232                 /* New buffers might have become available before we were added
 233                    to the waitqueue */
 234                 if (!atomic_read(&s->q_full.depth))
 235                         schedule();
 236                 finish_wait(&s->waitq, &wait);
 237                 if (signal_pending(current)) {
 238                         /* return if a signal was received */
 239                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 240                         *err = -EINTR;
 241                         return NULL;
 242                 }
 243         }
 244 }
 245
 246 static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
 247 {
 248         struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
 249         struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
 250         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 251
 252         buf->buf = cx->vbi.sliced_mpeg_data[idx];
 253         buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
 254         buf->readpos = 0;
 255
 256         mdl->curr_buf = NULL;
 257         mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
 258         mdl->readpos = 0;
 259 }
 260
 261 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 262         struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
 263 {
 264         struct cx18 *cx = s->cx;
 265         size_t len = buf->bytesused - buf->readpos;
 266
 267         *stop = false;
 268         if (len > ucount)
 269                 len = ucount;
 270         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 271             !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
 272                 /*
 273                  * Try to find a good splice point in the PS, just before
 274                  * an MPEG-2 Program Pack start code, and provide only
 275                  * up to that point to the user, so it's easy to insert VBI data
 276                  * the next time around.
 277                  *
 278                  * This will not work for an MPEG-2 TS and has only been
 279                  * verified by analysis to work for an MPEG-2 PS.  Helen Buus
 280                  * pointed out this works for the CX23416 MPEG-2 DVD compatible
 281                  * stream, and research indicates both the MPEG 2 SVCD and DVD
 282                  * stream types use an MPEG-2 PS container.
 283                  */
 284                 /*
 285                  * An MPEG-2 Program Stream (PS) is a series of
 286                  * MPEG-2 Program Packs terminated by an
 287                  * MPEG Program End Code after the last Program Pack.
 288                  * A Program Pack may hold a PS System Header packet and any
 289                  * number of Program Elementary Stream (PES) Packets
 290                  */
 291                 const char *start = buf->buf + buf->readpos;
 292                 const char *p = start + 1;
 293                 const u8 *q;
 294                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 295                 int stuffing, i;
 296
 297                 while (start + len > p) {
 298                         /* Scan for a 0 to find a potential MPEG-2 start code */
 299                         q = memchr(p, 0, start + len - p);
 300                         if (q == NULL)
 301                                 break;
 302                         p = q + 1;
 303                         /*
 304                          * Keep looking if not a
 305                          * MPEG-2 Pack header start code:  0x00 0x00 0x01 0xba
 306                          * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
 307                          */
 308                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 309                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 310                                 continue;
 311
 312                         /* If expecting the primary video PES */
 313                         if (!cx->search_pack_header) {
 314                                 /* Continue if it couldn't be a PES packet */
 315                                 if ((q[6] & 0xc0) != 0x80)
 316                                         continue;
 317                                 /* Check if a PTS or PTS & DTS follow */
 318                                 if (((q[7] & 0xc0) == 0x80 &&  /* PTS only */
 319                                      (q[9] & 0xf0) == 0x20) || /* PTS only */
 320                                     ((q[7] & 0xc0) == 0xc0 &&  /* PTS & DTS */
 321                                      (q[9] & 0xf0) == 0x30)) { /* DTS follows */
 322                                         /* Assume we found the video PES hdr */
 323                                         ch = 0xba; /* next want a Program Pack*/
 324                                         cx->search_pack_header = 1;
 325                                         p = q + 9; /* Skip this video PES hdr */
 326                                 }
 327                                 continue;
 328                         }
 329
 330                         /* We may have found a Program Pack start code */
 331
 332                         /* Get the count of stuffing bytes & verify them */
 333                         stuffing = q[13] & 7;
 334                         /* all stuffing bytes must be 0xff */
 335                         for (i = 0; i < stuffing; i++)
 336                                 if (q[14 + i] != 0xff)
 337                                         break;
 338                         if (i == stuffing && /* right number of stuffing bytes*/
 339                             (q[4] & 0xc4) == 0x44 && /* marker check */
 340                             (q[12] & 3) == 3 &&  /* marker check */
 341                             q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
 342                             q[15 + stuffing] == 0 &&
 343                             q[16 + stuffing] == 1) {
 344                                 /* We declare we actually found a Program Pack*/
 345                                 cx->search_pack_header = 0; /* expect vid PES */
 346                                 len = (char *)q - start;
 347                                 cx18_setup_sliced_vbi_mdl(cx);
 348                                 *stop = true;
 349                                 break;
 350                         }
 351                 }
 352         }
 353         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 354                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 355                                 len, s->name);
 356                 return -EFAULT;
 357         }
 358         buf->readpos += len;
 359         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 360             buf != &cx->vbi.sliced_mpeg_buf)
 361                 cx->mpg_data_received += len;
 362         return len;
 363 }
 364
 365 /**
 366  * list_entry_is_past_end - check if a previous loop cursor is off list end
 367  * @pos:        the type * previously used as a loop cursor.
 368  * @head:       the head for your list.
 369  * @member:     the name of the list_struct within the struct.
 370  *
 371  * Check if the entry's list_head is the head of the list, thus it's not a
 372  * real entry but was the loop cursor that walked past the end
 373  */
 374 #define list_entry_is_past_end(pos, head, member) \
 375         (&pos->member == (head))
 376
 377 static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
 378                 struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
 379 {
 380         size_t tot_written = 0;
 381         int rc;
 382         bool stop = false;
 383
 384         if (mdl->curr_buf == NULL)
 385                 mdl->curr_buf = list_first_entry(&mdl->buf_list,
 386                                                  struct cx18_buffer, list);
 387
 388         if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
 389                 /*
 390                  * For some reason we've exhausted the buffers, but the MDL
 391                  * object still said some data was unread.
 392                  * Fix that and bail out.
 393                  */
 394                 mdl->readpos = mdl->bytesused;
 395                 return 0;
 396         }
 397
 398         list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
 399
 400                 if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
 401                         continue;
 402
 403                 rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
 404                                            ucount - tot_written, &stop);
 405                 if (rc < 0)
 406                         return rc;
 407                 mdl->readpos += rc;
 408                 tot_written += rc;
 409
 410                 if (stop ||     /* Forced stopping point for VBI insertion */
 411                     tot_written >= ucount ||    /* Reader request statisfied */
 412                     mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
 413                     mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
 414                         break;
 415         }
 416         return tot_written;
 417 }
 418
 419 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 420                 size_t tot_count, int non_block)
 421 {
 422         struct cx18 *cx = s->cx;
 423         size_t tot_written = 0;
 424         int single_frame = 0;
 425
 426         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 427                 /* shouldn't happen */
 428                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 429                                 s->name);
 430                 return -EIO;
 431         }
 432
 433         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 434            frames should arrive one-by-one, so make sure we never output more
 435            than one VBI frame at a time */
 436         if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
 437                 single_frame = 1;
 438
 439         for (;;) {
 440                 struct cx18_mdl *mdl;
 441                 int rc;
 442
 443                 mdl = cx18_get_mdl(s, non_block, &rc);
 444                 /* if there is no data available... */
 445                 if (mdl == NULL) {
 446                         /* if we got data, then return that regardless */
 447                         if (tot_written)
 448                                 break;
 449                         /* EOS condition */
 450                         if (rc == 0) {
 451                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 452                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 453                                 cx18_release_stream(s);
 454                         }
 455                         /* set errno */
 456                         return rc;
 457                 }
 458
 459                 rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
 460                                 tot_count - tot_written);
 461
 462                 if (mdl != &cx->vbi.sliced_mpeg_mdl) {
 463                         if (mdl->readpos == mdl->bytesused)
 464                                 cx18_stream_put_mdl_fw(s, mdl);
 465                         else
 466                                 cx18_push(s, mdl, &s->q_full);
 467                 } else if (mdl->readpos == mdl->bytesused) {
 468                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 469
 470                         cx->vbi.sliced_mpeg_size[idx] = 0;
 471                         cx->vbi.inserted_frame++;
 472                         cx->vbi_data_inserted += mdl->bytesused;
 473                 }
 474                 if (rc < 0)
 475                         return rc;
 476                 tot_written += rc;
 477
 478                 if (tot_written == tot_count || single_frame)
 479                         break;
 480         }
 481         return tot_written;
 482 }
 483
 484 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 485                 size_t count, loff_t *pos, int non_block)
 486 {
 487         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 488         struct cx18 *cx = s->cx;
 489
 490         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 491         if (rc > 0)
 492                 pos += rc;
 493         return rc;
 494 }
 495
 496 int cx18_start_capture(struct cx18_open_id *id)
 497 {
 498         struct cx18 *cx = id->cx;
 499         struct cx18_stream *s = &cx->streams[id->type];
 500         struct cx18_stream *s_vbi;
 501
 502         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 503                 /* you cannot read from these stream types. */
 504                 return -EPERM;
 505         }
 506
 507         /* Try to claim this stream. */
 508         if (cx18_claim_stream(id, s->type))
 509                 return -EBUSY;
 510
 511         /* If capture is already in progress, then we also have to
 512            do nothing extra. */
 513         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 514             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 515                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 516                 return 0;
 517         }
 518
 519         /* Start VBI capture if required */
 520         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 521         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 522             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 523             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 524                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 525                    automatically when the MPG stream is claimed.
 526                    We only need to start the VBI capturing. */
 527                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 528                         CX18_DEBUG_WARN("VBI capture start failed\n");
 529
 530                         /* Failure, clean up and return an error */
 531                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 532                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 533                         /* also releases the associated VBI stream */
 534                         cx18_release_stream(s);
 535                         return -EIO;
 536                 }
 537                 CX18_DEBUG_INFO("VBI insertion started\n");
 538         }
 539
 540         /* Tell the card to start capturing */
 541         if (!cx18_start_v4l2_encode_stream(s)) {
 542                 /* We're done */
 543                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 544                 /* Resume a possibly paused encoder */
 545                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 546                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 547                 return 0;
 548         }
 549
 550         /* failure, clean up */
 551         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 552
 553         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 554            automatically when the MPG stream is released.
 555            We only need to stop the VBI capturing. */
 556         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 557             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 558                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 559                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 560         }
 561         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 562         cx18_release_stream(s);
 563         return -EIO;
 564 }
 565
 566 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 567                 loff_t *pos)
 568 {
 569         struct cx18_open_id *id = filp->private_data;
 570         struct cx18 *cx = id->cx;
 571         struct cx18_stream *s = &cx->streams[id->type];
 572         int rc;
 573
 574         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 575
 576         mutex_lock(&cx->serialize_lock);
 577         rc = cx18_start_capture(id);
 578         mutex_unlock(&cx->serialize_lock);
 579         if (rc)
 580                 return rc;
 581         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 582 }
 583
 584 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 585 {
 586         struct cx18_open_id *id = filp->private_data;
 587         struct cx18 *cx = id->cx;
 588         struct cx18_stream *s = &cx->streams[id->type];
 589         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 590
 591         /* Start a capture if there is none */
 592         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 593                 int rc;
 594
 595                 mutex_lock(&cx->serialize_lock);
 596                 rc = cx18_start_capture(id);
 597                 mutex_unlock(&cx->serialize_lock);
 598                 if (rc) {
 599                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 600                                         s->name, rc);
 601                         return POLLERR;
 602                 }
 603                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 604         }
 605
 606         /* add stream's waitq to the poll list */
 607         CX18_DEBUG_HI_FILE("Encoder poll\n");
 608         poll_wait(filp, &s->waitq, wait);
 609
 610         if (atomic_read(&s->q_full.depth))
 611                 return POLLIN | POLLRDNORM;
 612         if (eof)
 613                 return POLLHUP;
 614         return 0;
 615 }
 616
 617 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 618 {
 619         struct cx18 *cx = id->cx;
 620         struct cx18_stream *s = &cx->streams[id->type];
 621
 622         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 623
 624         /* 'Unclaim' this stream */
 625
 626         /* Stop capturing */
 627         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 628                 struct cx18_stream *s_vbi =
 629                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 630
 631                 CX18_DEBUG_INFO("close stopping capture\n");
 632                 /* Special case: a running VBI capture for VBI insertion
 633                    in the mpeg stream. Need to stop that too. */
 634                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 635                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 636                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 637                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 638                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 639                 }
 640                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 641                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 642                         /* Also used internally, don't stop capturing */
 643                         s->id = -1;
 644                 else
 645                         cx18_stop_v4l2_encode_stream(s, gop_end);
 646         }
 647         if (!gop_end) {
 648                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 649                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 650                 cx18_release_stream(s);
 651         }
 652 }
 653
 654 int cx18_v4l2_close(struct file *filp)
 655 {
 656         struct cx18_open_id *id = filp->private_data;
 657         struct cx18 *cx = id->cx;
 658         struct cx18_stream *s = &cx->streams[id->type];
 659
 660         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 661
 662         v4l2_prio_close(&cx->prio, &id->prio);
 663
 664         /* Easy case first: this stream was never claimed by us */
 665         if (s->id != id->open_id) {
 666                 kfree(id);
 667                 return 0;
 668         }
 669
 670         /* 'Unclaim' this stream */
 671
 672         /* Stop radio */
 673         mutex_lock(&cx->serialize_lock);
 674         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 675                 /* Closing radio device, return to TV mode */
 676                 cx18_mute(cx);
 677                 /* Mark that the radio is no longer in use */
 678                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 679                 /* Switch tuner to TV */
 680                 cx18_call_all(cx, core, s_std, cx->std);
 681                 /* Select correct audio input (i.e. TV tuner or Line in) */
 682                 cx18_audio_set_io(cx);
 683                 if (atomic_read(&cx->ana_capturing) > 0) {
 684                         /* Undo video mute */
 685                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 686                                 cx->params.video_mute |
 687                                         (cx->params.video_mute_yuv << 8));
 688                 }
 689                 /* Done! Unmute and continue. */
 690                 cx18_unmute(cx);
 691                 cx18_release_stream(s);
 692         } else {
 693                 cx18_stop_capture(id, 0);
 694         }
 695         kfree(id);
 696         mutex_unlock(&cx->serialize_lock);
 697         return 0;
 698 }
 699
 700 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 701 {
 702         struct cx18 *cx = s->cx;
 703         struct cx18_open_id *item;
 704
 705         CX18_DEBUG_FILE("open %s\n", s->name);
 706
 707         /* Allocate memory */
 708         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 709         if (NULL == item) {
 710                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 711                 return -ENOMEM;
 712         }
 713         item->cx = cx;
 714         item->type = s->type;
 715         v4l2_prio_open(&cx->prio, &item->prio);
 716
 717         item->open_id = cx->open_id++;
 718         filp->private_data = item;
 719
 720         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 721                 /* Try to claim this stream */
 722                 if (cx18_claim_stream(item, item->type)) {
 723                         /* No, it's already in use */
 724                         kfree(item);
 725                         return -EBUSY;
 726                 }
 727
 728                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 729                         if (atomic_read(&cx->ana_capturing) > 0) {
 730                                 /* switching to radio while capture is
 731                                    in progress is not polite */
 732                                 cx18_release_stream(s);
 733                                 kfree(item);
 734                                 return -EBUSY;
 735                         }
 736                 }
 737
 738                 /* Mark that the radio is being used. */
 739                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 740                 /* We have the radio */
 741                 cx18_mute(cx);
 742                 /* Switch tuner to radio */
 743                 cx18_call_all(cx, tuner, s_radio);
 744                 /* Select the correct audio input (i.e. radio tuner) */
 745                 cx18_audio_set_io(cx);
 746                 /* Done! Unmute and continue. */
 747                 cx18_unmute(cx);
 748         }
 749         return 0;
 750 }
 751
 752 int cx18_v4l2_open(struct file *filp)
 753 {
 754         int res;
 755         struct video_device *video_dev = video_devdata(filp);
 756         struct cx18_stream *s = video_get_drvdata(video_dev);
 757         struct cx18 *cx = s->cx;
 758
 759         mutex_lock(&cx->serialize_lock);
 760         if (cx18_init_on_first_open(cx)) {
 761                 CX18_ERR("Failed to initialize on %s\n",
 762                          video_device_node_name(video_dev));
 763                 mutex_unlock(&cx->serialize_lock);
 764                 return -ENXIO;
 765         }
 766         res = cx18_serialized_open(s, filp);
 767         mutex_unlock(&cx->serialize_lock);
 768         return res;
 769 }
 770
 771 void cx18_mute(struct cx18 *cx)
 772 {
 773         u32 h;
 774         if (atomic_read(&cx->ana_capturing)) {
 775                 h = cx18_find_handle(cx);
 776                 if (h != CX18_INVALID_TASK_HANDLE)
 777                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 778                 else
 779                         CX18_ERR("Can't find valid task handle for mute\n");
 780         }
 781         CX18_DEBUG_INFO("Mute\n");
 782 }
 783
 784 void cx18_unmute(struct cx18 *cx)
 785 {
 786         u32 h;
 787         if (atomic_read(&cx->ana_capturing)) {
 788                 h = cx18_find_handle(cx);
 789                 if (h != CX18_INVALID_TASK_HANDLE) {
 790                         cx18_msleep_timeout(100, 0);
 791                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 792                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 793                 } else
 794                         CX18_ERR("Can't find valid task handle for unmute\n");
 795         }
 796         CX18_DEBUG_INFO("Unmute\n");
 797 }