git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/ivtv/ivtv-fileops.c

   1 /*
   2     file operation functions
   3     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   4     Copyright (C) 2004  Chris Kennedy <c@groovy.org>
   5     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "ivtv-driver.h"
  23 #include "ivtv-fileops.h"
  24 #include "ivtv-i2c.h"
  25 #include "ivtv-queue.h"
  26 #include "ivtv-udma.h"
  27 #include "ivtv-irq.h"
  28 #include "ivtv-vbi.h"
  29 #include "ivtv-mailbox.h"
  30 #include "ivtv-audio.h"
  31 #include "ivtv-streams.h"
  32 #include "ivtv-yuv.h"
  33 #include "ivtv-controls.h"
  34 #include "ivtv-ioctl.h"
  35 #include "ivtv-cards.h"
  36 #include <media/saa7115.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 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  44 {
  45         struct ivtv *itv = id->itv;
  46         struct ivtv_stream *s = &itv->streams[type];
  47         struct ivtv_stream *s_vbi;
  48         int vbi_type;
  49
  50         if (test_and_set_bit(IVTV_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 == IVTV_DEC_STREAM_TYPE_VBI ||
  57                                          type == IVTV_ENC_STREAM_TYPE_VBI)) {
  58                         /* VBI is handled already internally, now also assign
  59                            the file descriptor to this stream for external
  60                            reading of the stream. */
  61                         s->id = id->open_id;
  62                         IVTV_DEBUG_INFO("Start Read VBI\n");
  63                         return 0;
  64                 }
  65                 /* someone else is using this stream already */
  66                 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  67                 return -EBUSY;
  68         }
  69         s->id = id->open_id;
  70         if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  71                 /* Enable reinsertion interrupt */
  72                 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  73         }
  74
  75         /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  76            IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  77            (provided VBI insertion is on and sliced VBI is selected), for all
  78            other streams we're done */
  79         if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  80                 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  81         } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  82                    itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
  83                 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  84         } else {
  85                 return 0;
  86         }
  87         s_vbi = &itv->streams[vbi_type];
  88
  89         if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  90                 /* Enable reinsertion interrupt */
  91                 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  92                         ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  93         }
  94         /* mark that it is used internally */
  95         set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  96         return 0;
  97 }
  98
  99 /* This function releases a previously claimed stream. It will take into
 100    account associated VBI streams. */
 101 void ivtv_release_stream(struct ivtv_stream *s)
 102 {
 103         struct ivtv *itv = s->itv;
 104         struct ivtv_stream *s_vbi;
 105
 106         s->id = -1;
 107         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 108                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 109                 /* this stream is still in use internally */
 110                 return;
 111         }
 112         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 113                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 114                 return;
 115         }
 116
 117         ivtv_flush_queues(s);
 118
 119         /* disable reinsertion interrupt */
 120         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 121                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 122
 123         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 124            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 125            for all other streams we're done */
 126         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 127                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 128         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 129                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 130         else
 131                 return;
 132
 133         /* clear internal use flag */
 134         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 135                 /* was already cleared */
 136                 return;
 137         }
 138         if (s_vbi->id != -1) {
 139                 /* VBI stream still claimed by a file descriptor */
 140                 return;
 141         }
 142         /* disable reinsertion interrupt */
 143         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 144                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 145         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 146         ivtv_flush_queues(s_vbi);
 147 }
 148
 149 static void ivtv_dualwatch(struct ivtv *itv)
 150 {
 151         struct v4l2_tuner vt;
 152         u16 new_bitmap;
 153         u16 new_stereo_mode;
 154         const u16 stereo_mask = 0x0300;
 155         const u16 dual = 0x0200;
 156
 157         new_stereo_mode = itv->params.audio_properties & stereo_mask;
 158         memset(&vt, 0, sizeof(vt));
 159         ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
 160         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 161                 new_stereo_mode = dual;
 162
 163         if (new_stereo_mode == itv->dualwatch_stereo_mode)
 164                 return;
 165
 166         new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
 167
 168         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 169                            itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 170
 171         if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
 172                 itv->dualwatch_stereo_mode = new_stereo_mode;
 173                 return;
 174         }
 175         IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 176 }
 177
 178 static void ivtv_update_pgm_info(struct ivtv *itv)
 179 {
 180         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 181         int cnt;
 182         int i = 0;
 183
 184         if (wr_idx >= itv->pgm_info_num) {
 185                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 186                 return;
 187         }
 188         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 189         while (i < cnt) {
 190                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 191                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 192                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 193                 const int mapping[] = { V4L2_ENC_IDX_FRAME_P, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_B, 0 };
 194
 195                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 196                 if (e->offset > itv->mpg_data_received) {
 197                         break;
 198                 }
 199                 e->offset += itv->vbi_data_inserted;
 200                 e->length = read_enc(addr);
 201                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 202                 e->flags = mapping[read_enc(addr + 12) & 3];
 203                 i++;
 204         }
 205         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 206 }
 207
 208 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 209 {
 210         struct ivtv *itv = s->itv;
 211         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 212         struct ivtv_buffer *buf;
 213         DEFINE_WAIT(wait);
 214
 215         *err = 0;
 216         while (1) {
 217                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 218                         /* Process pending program info updates and pending VBI data */
 219                         ivtv_update_pgm_info(itv);
 220
 221                         if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
 222                                 itv->dualwatch_jiffies = jiffies;
 223                                 ivtv_dualwatch(itv);
 224                         }
 225
 226                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 227                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 228                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 229                                         /* byteswap and process VBI data */
 230                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 231                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 232                                 }
 233                         }
 234                         buf = &itv->vbi.sliced_mpeg_buf;
 235                         if (buf->readpos != buf->bytesused) {
 236                                 return buf;
 237                         }
 238                 }
 239
 240                 /* do we have leftover data? */
 241                 buf = ivtv_dequeue(s, &s->q_io);
 242                 if (buf)
 243                         return buf;
 244
 245                 /* do we have new data? */
 246                 buf = ivtv_dequeue(s, &s->q_full);
 247                 if (buf) {
 248                         if (!test_and_clear_bit(IVTV_F_B_NEED_BUF_SWAP, &buf->b_flags))
 249                                 return buf;
 250                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 251                                 /* byteswap MPG data */
 252                                 ivtv_buf_swap(buf);
 253                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 254                                 /* byteswap and process VBI data */
 255                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 256                         }
 257                         return buf;
 258                 }
 259                 /* return if file was opened with O_NONBLOCK */
 260                 if (non_block) {
 261                         *err = -EAGAIN;
 262                         return NULL;
 263                 }
 264
 265                 /* return if end of stream */
 266                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 267                         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 268                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 269                         return NULL;
 270                 }
 271
 272                 /* wait for more data to arrive */
 273                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 274                 /* New buffers might have become available before we were added to the waitqueue */
 275                 if (!s->q_full.buffers)
 276                         schedule();
 277                 finish_wait(&s->waitq, &wait);
 278                 if (signal_pending(current)) {
 279                         /* return if a signal was received */
 280                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 281                         *err = -EINTR;
 282                         return NULL;
 283                 }
 284         }
 285 }
 286
 287 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 288 {
 289         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 290
 291         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 292         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 293         itv->vbi.sliced_mpeg_buf.readpos = 0;
 294 }
 295
 296 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 297                 char __user *ubuf, size_t ucount)
 298 {
 299         struct ivtv *itv = s->itv;
 300         size_t len = buf->bytesused - buf->readpos;
 301
 302         if (len > ucount) len = ucount;
 303         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 304             itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
 305                 const char *start = buf->buf + buf->readpos;
 306                 const char *p = start + 1;
 307                 const u8 *q;
 308                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 309                 int stuffing, i;
 310
 311                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 312                         p = q + 1;
 313                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 314                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 315                                 continue;
 316                         }
 317                         if (!itv->search_pack_header) {
 318                                 if ((q[6] & 0xc0) != 0x80)
 319                                         continue;
 320                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 321                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 322                                         ch = 0xba;
 323                                         itv->search_pack_header = 1;
 324                                         p = q + 9;
 325                                 }
 326                                 continue;
 327                         }
 328                         stuffing = q[13] & 7;
 329                         /* all stuffing bytes must be 0xff */
 330                         for (i = 0; i < stuffing; i++)
 331                                 if (q[14 + i] != 0xff)
 332                                         break;
 333                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 334                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 335                                         q[16 + stuffing] == 1) {
 336                                 itv->search_pack_header = 0;
 337                                 len = (char *)q - start;
 338                                 ivtv_setup_sliced_vbi_buf(itv);
 339                                 break;
 340                         }
 341                 }
 342         }
 343         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 344                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 345                 return -EFAULT;
 346         }
 347         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 348                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 349                         buf == &itv->vbi.sliced_mpeg_buf); */
 350         buf->readpos += len;
 351         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 352                 itv->mpg_data_received += len;
 353         return len;
 354 }
 355
 356 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 357 {
 358         struct ivtv *itv = s->itv;
 359         size_t tot_written = 0;
 360         int single_frame = 0;
 361
 362         if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
 363                 /* shouldn't happen */
 364                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 365                 return -EIO;
 366         }
 367
 368         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 369            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 370         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 371                         (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
 372                 single_frame = 1;
 373
 374         for (;;) {
 375                 struct ivtv_buffer *buf;
 376                 int rc;
 377
 378                 buf = ivtv_get_buffer(s, non_block, &rc);
 379                 if (buf == NULL && rc == -EAGAIN && tot_written)
 380                         break;
 381                 if (buf == NULL)
 382                         return rc;
 383                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 384                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 385                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 386                 }
 387                 else if (buf->readpos == buf->bytesused) {
 388                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 389                         itv->vbi.sliced_mpeg_size[idx] = 0;
 390                         itv->vbi.inserted_frame++;
 391                         itv->vbi_data_inserted += buf->bytesused;
 392                 }
 393                 if (rc < 0)
 394                         return rc;
 395                 tot_written += rc;
 396
 397                 if (tot_written == tot_count || single_frame)
 398                         break;
 399         }
 400         return tot_written;
 401 }
 402
 403 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 404                         loff_t *pos, int non_block)
 405 {
 406         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 407         struct ivtv *itv = s->itv;
 408
 409         IVTV_DEBUG_HI_INFO("read %zd from %s, got %zd\n", count, s->name, rc);
 410         if (rc > 0)
 411                 pos += rc;
 412         return rc;
 413 }
 414
 415 int ivtv_start_capture(struct ivtv_open_id *id)
 416 {
 417         struct ivtv *itv = id->itv;
 418         struct ivtv_stream *s = &itv->streams[id->type];
 419         struct ivtv_stream *s_vbi;
 420
 421         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 422             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 423             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 424             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 425                 /* you cannot read from these stream types. */
 426                 return -EPERM;
 427         }
 428
 429         /* Try to claim this stream. */
 430         if (ivtv_claim_stream(id, s->type))
 431                 return -EBUSY;
 432
 433         /* This stream does not need to start capturing */
 434         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 435                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 436                 return 0;
 437         }
 438
 439         /* If capture is already in progress, then we also have to
 440            do nothing extra. */
 441         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 442                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 443                 return 0;
 444         }
 445
 446         /* Start VBI capture if required */
 447         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 448         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 449             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 450             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 451                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 452                    automatically when the MPG stream is claimed.
 453                    We only need to start the VBI capturing. */
 454                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 455                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 456
 457                         /* Failure, clean up and return an error */
 458                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 459                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 460                         /* also releases the associated VBI stream */
 461                         ivtv_release_stream(s);
 462                         return -EIO;
 463                 }
 464                 IVTV_DEBUG_INFO("VBI insertion started\n");
 465         }
 466
 467         /* Tell the card to start capturing */
 468         if (!ivtv_start_v4l2_encode_stream(s)) {
 469                 /* We're done */
 470                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 471                 /* Resume a possibly paused encoder */
 472                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 473                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 474                 return 0;
 475         }
 476
 477         /* failure, clean up */
 478         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 479
 480         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 481            automatically when the MPG stream is released.
 482            We only need to stop the VBI capturing. */
 483         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 484             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 485                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 486                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 487         }
 488         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 489         ivtv_release_stream(s);
 490         return -EIO;
 491 }
 492
 493 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 494 {
 495         struct ivtv_open_id *id = filp->private_data;
 496         struct ivtv *itv = id->itv;
 497         struct ivtv_stream *s = &itv->streams[id->type];
 498         int rc;
 499
 500         IVTV_DEBUG_HI_IOCTL("read %zd bytes from %s\n", count, s->name);
 501
 502         rc = ivtv_start_capture(id);
 503         if (rc)
 504                 return rc;
 505         return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 506 }
 507
 508 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 509 {
 510         struct ivtv *itv = id->itv;
 511         struct ivtv_stream *s = &itv->streams[id->type];
 512
 513         if (atomic_read(&itv->decoding) == 0) {
 514                 if (ivtv_claim_stream(id, s->type)) {
 515                         /* someone else is using this stream already */
 516                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 517                         return -EBUSY;
 518                 }
 519                 ivtv_start_v4l2_decode_stream(s, 0);
 520         }
 521         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 522                 return ivtv_set_speed(itv, speed);
 523         return 0;
 524 }
 525
 526 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 527 {
 528         struct ivtv_open_id *id = filp->private_data;
 529         struct ivtv *itv = id->itv;
 530         struct ivtv_stream *s = &itv->streams[id->type];
 531         struct ivtv_buffer *buf;
 532         struct ivtv_queue q;
 533         int bytes_written = 0;
 534         int mode;
 535         int rc;
 536         DEFINE_WAIT(wait);
 537
 538         IVTV_DEBUG_HI_IOCTL("write %zd bytes to %s\n", count, s->name);
 539
 540         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 541             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 542             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 543                 /* not decoder streams */
 544                 return -EPERM;
 545
 546         /* Try to claim this stream */
 547         if (ivtv_claim_stream(id, s->type))
 548                 return -EBUSY;
 549
 550         /* This stream does not need to start any decoding */
 551         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 552                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 553                 return ivtv_write_vbi(itv, user_buf, count);
 554         }
 555
 556         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 557
 558         if (ivtv_set_output_mode(itv, mode) != mode) {
 559             ivtv_release_stream(s);
 560             return -EBUSY;
 561         }
 562         ivtv_queue_init(&q);
 563         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 564
 565 retry:
 566         for (;;) {
 567                 /* Gather buffers */
 568                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 569                         ivtv_enqueue(s, buf, &q);
 570                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 571                         ivtv_enqueue(s, buf, &q);
 572                 }
 573                 if (q.buffers)
 574                         break;
 575                 if (filp->f_flags & O_NONBLOCK)
 576                         return -EAGAIN;
 577                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 578                 /* New buffers might have become free before we were added to the waitqueue */
 579                 if (!s->q_free.buffers)
 580                         schedule();
 581                 finish_wait(&s->waitq, &wait);
 582                 if (signal_pending(current)) {
 583                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 584                         return -EINTR;
 585                 }
 586         }
 587
 588         /* copy user data into buffers */
 589         while ((buf = ivtv_dequeue(s, &q))) {
 590                 /* Make sure we really got all the user data */
 591                 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 592
 593                 if (rc < 0) {
 594                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 595                         return rc;
 596                 }
 597                 user_buf += rc;
 598                 count -= rc;
 599                 bytes_written += rc;
 600
 601                 if (buf->bytesused != s->buf_size) {
 602                         /* incomplete, leave in q_io for next time */
 603                         ivtv_enqueue(s, buf, &s->q_io);
 604                         break;
 605                 }
 606                 /* Byteswap MPEG buffer */
 607                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 608                         ivtv_buf_swap(buf);
 609                 ivtv_enqueue(s, buf, &s->q_full);
 610         }
 611
 612         /* Start decoder (returns 0 if already started) */
 613         rc = ivtv_start_decoding(id, itv->speed);
 614         if (rc) {
 615                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 616
 617                 /* failure, clean up */
 618                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 619                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 620                 return rc;
 621         }
 622         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 623                 if (s->q_full.length >= itv->dma_data_req_size) {
 624                         int got_sig;
 625
 626                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 627                         while (!(got_sig = signal_pending(current)) &&
 628                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 629                                 schedule();
 630                         }
 631                         finish_wait(&itv->dma_waitq, &wait);
 632                         if (got_sig) {
 633                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 634                                 return -EINTR;
 635                         }
 636
 637                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 638                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 639                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 640                 }
 641         }
 642         /* more user data is available, wait until buffers become free
 643            to transfer the rest. */
 644         if (count && !(filp->f_flags & O_NONBLOCK))
 645                 goto retry;
 646         IVTV_DEBUG_HI_INFO("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 647         return bytes_written;
 648 }
 649
 650 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 651 {
 652         struct ivtv_open_id *id = filp->private_data;
 653         struct ivtv *itv = id->itv;
 654         struct ivtv_stream *s = &itv->streams[id->type];
 655         int res = 0;
 656
 657         /* add stream's waitq to the poll list */
 658         poll_wait(filp, &s->waitq, wait);
 659
 660         set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 661         if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 662             test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 663                 res = POLLPRI;
 664
 665         /* Allow write if buffers are available for writing */
 666         if (s->q_free.buffers)
 667                 res |= POLLOUT | POLLWRNORM;
 668         return res;
 669 }
 670
 671 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 672 {
 673         struct ivtv_open_id *id = filp->private_data;
 674         struct ivtv *itv = id->itv;
 675         struct ivtv_stream *s = &itv->streams[id->type];
 676         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 677
 678         /* Start a capture if there is none */
 679         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 680                 int rc = ivtv_start_capture(id);
 681
 682                 if (rc) {
 683                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 684                                         s->name, rc);
 685                         return POLLERR;
 686                 }
 687         }
 688
 689         /* add stream's waitq to the poll list */
 690         poll_wait(filp, &s->waitq, wait);
 691
 692         if (eof || s->q_full.length)
 693                 return POLLIN | POLLRDNORM;
 694         return 0;
 695 }
 696
 697 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 698 {
 699         struct ivtv *itv = id->itv;
 700         struct ivtv_stream *s = &itv->streams[id->type];
 701
 702         IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
 703
 704         /* 'Unclaim' this stream */
 705
 706         /* Stop capturing */
 707         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 708                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 709
 710                 IVTV_DEBUG_INFO("close stopping capture\n");
 711                 /* Special case: a running VBI capture for VBI insertion
 712                    in the mpeg stream. Need to stop that too. */
 713                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 714                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 715                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 716                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 717                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 718                 }
 719                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 720                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 721                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 722                         /* Also used internally, don't stop capturing */
 723                         s->id = -1;
 724                 }
 725                 else {
 726                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 727                 }
 728         }
 729         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 730         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 731
 732         ivtv_release_stream(s);
 733 }
 734
 735 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 736 {
 737         struct ivtv *itv = id->itv;
 738         struct ivtv_stream *s = &itv->streams[id->type];
 739
 740         IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
 741
 742         /* Stop decoding */
 743         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 744                 IVTV_DEBUG_INFO("close stopping decode\n");
 745
 746                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 747         }
 748         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 749         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 750         if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 751                 /* Restore registers we've changed & clean up any mess we've made */
 752                 ivtv_yuv_close(itv);
 753         }
 754         if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_YUV)
 755             itv->output_mode = OUT_NONE;
 756         else if (s->type == IVTV_DEC_STREAM_TYPE_MPG && itv->output_mode == OUT_MPG)
 757             itv->output_mode = OUT_NONE;
 758
 759         itv->speed = 0;
 760         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 761         ivtv_release_stream(s);
 762 }
 763
 764 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
 765 {
 766         struct ivtv_open_id *id = filp->private_data;
 767         struct ivtv *itv = id->itv;
 768         struct ivtv_stream *s = &itv->streams[id->type];
 769
 770         IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
 771
 772         v4l2_prio_close(&itv->prio, &id->prio);
 773
 774         /* Easy case first: this stream was never claimed by us */
 775         if (s->id != id->open_id) {
 776                 kfree(id);
 777                 return 0;
 778         }
 779
 780         /* 'Unclaim' this stream */
 781
 782         /* Stop radio */
 783         if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
 784                 /* Closing radio device, return to TV mode */
 785                 ivtv_mute(itv);
 786                 /* Mark that the radio is no longer in use */
 787                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 788                 /* Switch tuner to TV */
 789                 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
 790                 /* Select correct audio input (i.e. TV tuner or Line in) */
 791                 ivtv_audio_set_io(itv);
 792                 if (itv->hw_flags & IVTV_HW_SAA711X)
 793                 {
 794                         struct v4l2_crystal_freq crystal_freq;
 795                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 796                         crystal_freq.flags = 0;
 797                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 798                 }
 799                 /* Done! Unmute and continue. */
 800                 ivtv_unmute(itv);
 801                 ivtv_release_stream(s);
 802         } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 803                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 804
 805                 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
 806
 807                 /* If all output streams are closed, and if the user doesn't have
 808                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
 809                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 810                         /* disable VBI on TV-out */
 811                         ivtv_disable_vbi(itv);
 812                 }
 813         } else {
 814                 ivtv_stop_capture(id, 0);
 815         }
 816         kfree(id);
 817         return 0;
 818 }
 819
 820 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
 821 {
 822         int x, y = 0;
 823         struct ivtv_open_id *item;
 824         struct ivtv *itv = NULL;
 825         struct ivtv_stream *s = NULL;
 826         int minor = iminor(inode);
 827
 828         /* Find which card this open was on */
 829         spin_lock(&ivtv_cards_lock);
 830         for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
 831                 /* find out which stream this open was on */
 832                 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
 833                         s = &ivtv_cards[x]->streams[y];
 834                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 835                                 itv = ivtv_cards[x];
 836                                 break;
 837                         }
 838                 }
 839         }
 840         spin_unlock(&ivtv_cards_lock);
 841
 842         if (itv == NULL) {
 843                 /* Couldn't find a device registered
 844                    on that minor, shouldn't happen! */
 845                 printk(KERN_WARNING "ivtv:  No ivtv device found on minor %d\n", minor);
 846                 return -ENXIO;
 847         }
 848
 849         if (y == IVTV_DEC_STREAM_TYPE_MPG &&
 850                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 851                 return -EBUSY;
 852
 853         if (y == IVTV_DEC_STREAM_TYPE_YUV &&
 854                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 855                 return -EBUSY;
 856
 857         if (y == IVTV_DEC_STREAM_TYPE_YUV) {
 858                 if (read_reg(0x82c) == 0) {
 859                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 860                         /* return -ENODEV; */
 861                 }
 862                 ivtv_udma_alloc(itv);
 863         }
 864
 865         /* Allocate memory */
 866         item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 867         if (NULL == item) {
 868                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 869                 return -ENOMEM;
 870         }
 871         item->itv = itv;
 872         item->type = y;
 873         v4l2_prio_open(&itv->prio, &item->prio);
 874
 875         item->open_id = itv->open_id++;
 876         filp->private_data = item;
 877
 878         if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
 879                 /* Try to claim this stream */
 880                 if (ivtv_claim_stream(item, item->type)) {
 881                         /* No, it's already in use */
 882                         kfree(item);
 883                         return -EBUSY;
 884                 }
 885
 886                 /* We have the radio */
 887                 ivtv_mute(itv);
 888                 /* Switch tuner to radio */
 889                 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
 890                 /* Mark that the radio is being used. */
 891                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 892                 /* Select the correct audio input (i.e. radio tuner) */
 893                 ivtv_audio_set_io(itv);
 894                 if (itv->hw_flags & IVTV_HW_SAA711X)
 895                 {
 896                         struct v4l2_crystal_freq crystal_freq;
 897                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 898                         crystal_freq.flags = SAA7115_FREQ_FL_APLL;
 899                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 900                 }
 901                 /* Done! Unmute and continue. */
 902                 ivtv_unmute(itv);
 903         }
 904
 905         /* YUV or MPG Decoding Mode? */
 906         if (y == IVTV_DEC_STREAM_TYPE_MPG)
 907                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 908         else if (y == IVTV_DEC_STREAM_TYPE_YUV)
 909         {
 910                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 911         }
 912
 913         return 0;
 914 }
 915
 916 void ivtv_mute(struct ivtv *itv)
 917 {
 918         struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 1 };
 919
 920         /* Mute sound to avoid pop */
 921         ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);
 922
 923         if (atomic_read(&itv->capturing))
 924                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
 925
 926         IVTV_DEBUG_INFO("Mute\n");
 927 }
 928
 929 void ivtv_unmute(struct ivtv *itv)
 930 {
 931         struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 0 };
 932
 933         /* initialize or refresh input */
 934         if (atomic_read(&itv->capturing) == 0)
 935                 ivtv_vapi(itv, CX2341X_ENC_INITIALIZE_INPUT, 0);
 936
 937         ivtv_msleep_timeout(100, 0);
 938
 939         if (atomic_read(&itv->capturing)) {
 940                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
 941                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
 942         }
 943
 944         /* Unmute */
 945         ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);
 946         IVTV_DEBUG_INFO("Unmute\n");
 947 }