err.no 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[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 194                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 195                                         // 1=I, 2=P, 4=B
 196
 197                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 198                 if (e->offset > itv->mpg_data_received) {
 199                         break;
 200                 }
 201                 e->offset += itv->vbi_data_inserted;
 202                 e->length = read_enc(addr);
 203                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 204                 e->flags = mapping[read_enc(addr + 12) & 7];
 205                 i++;
 206         }
 207         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 208 }
 209
 210 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 211 {
 212         struct ivtv *itv = s->itv;
 213         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 214         struct ivtv_buffer *buf;
 215         DEFINE_WAIT(wait);
 216
 217         *err = 0;
 218         while (1) {
 219                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 220                         /* Process pending program info updates and pending VBI data */
 221                         ivtv_update_pgm_info(itv);
 222
 223                         if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
 224                                 itv->dualwatch_jiffies = jiffies;
 225                                 ivtv_dualwatch(itv);
 226                         }
 227
 228                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 229                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 230                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 231                                         /* byteswap and process VBI data */
 232                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 233                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 234                                 }
 235                         }
 236                         buf = &itv->vbi.sliced_mpeg_buf;
 237                         if (buf->readpos != buf->bytesused) {
 238                                 return buf;
 239                         }
 240                 }
 241
 242                 /* do we have leftover data? */
 243                 buf = ivtv_dequeue(s, &s->q_io);
 244                 if (buf)
 245                         return buf;
 246
 247                 /* do we have new data? */
 248                 buf = ivtv_dequeue(s, &s->q_full);
 249                 if (buf) {
 250                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 251                                 return buf;
 252                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 253                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 254                                 /* byteswap MPG data */
 255                                 ivtv_buf_swap(buf);
 256                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 257                                 /* byteswap and process VBI data */
 258                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 259                         }
 260                         return buf;
 261                 }
 262                 /* return if file was opened with O_NONBLOCK */
 263                 if (non_block) {
 264                         *err = -EAGAIN;
 265                         return NULL;
 266                 }
 267
 268                 /* return if end of stream */
 269                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 270                         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 271                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 272                         return NULL;
 273                 }
 274
 275                 /* wait for more data to arrive */
 276                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 277                 /* New buffers might have become available before we were added to the waitqueue */
 278                 if (!s->q_full.buffers)
 279                         schedule();
 280                 finish_wait(&s->waitq, &wait);
 281                 if (signal_pending(current)) {
 282                         /* return if a signal was received */
 283                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 284                         *err = -EINTR;
 285                         return NULL;
 286                 }
 287         }
 288 }
 289
 290 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 291 {
 292         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 293
 294         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 295         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 296         itv->vbi.sliced_mpeg_buf.readpos = 0;
 297 }
 298
 299 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 300                 char __user *ubuf, size_t ucount)
 301 {
 302         struct ivtv *itv = s->itv;
 303         size_t len = buf->bytesused - buf->readpos;
 304
 305         if (len > ucount) len = ucount;
 306         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 307             itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
 308                 const char *start = buf->buf + buf->readpos;
 309                 const char *p = start + 1;
 310                 const u8 *q;
 311                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 312                 int stuffing, i;
 313
 314                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 315                         p = q + 1;
 316                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 317                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 318                                 continue;
 319                         }
 320                         if (!itv->search_pack_header) {
 321                                 if ((q[6] & 0xc0) != 0x80)
 322                                         continue;
 323                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 324                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 325                                         ch = 0xba;
 326                                         itv->search_pack_header = 1;
 327                                         p = q + 9;
 328                                 }
 329                                 continue;
 330                         }
 331                         stuffing = q[13] & 7;
 332                         /* all stuffing bytes must be 0xff */
 333                         for (i = 0; i < stuffing; i++)
 334                                 if (q[14 + i] != 0xff)
 335                                         break;
 336                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 337                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 338                                         q[16 + stuffing] == 1) {
 339                                 itv->search_pack_header = 0;
 340                                 len = (char *)q - start;
 341                                 ivtv_setup_sliced_vbi_buf(itv);
 342                                 break;
 343                         }
 344                 }
 345         }
 346         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 347                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 348                 return -EFAULT;
 349         }
 350         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 351                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 352                         buf == &itv->vbi.sliced_mpeg_buf); */
 353         buf->readpos += len;
 354         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 355                 itv->mpg_data_received += len;
 356         return len;
 357 }
 358
 359 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 360 {
 361         struct ivtv *itv = s->itv;
 362         size_t tot_written = 0;
 363         int single_frame = 0;
 364
 365         if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
 366                 /* shouldn't happen */
 367                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 368                 return -EIO;
 369         }
 370
 371         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 372            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 373         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 374                         (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
 375                 single_frame = 1;
 376
 377         for (;;) {
 378                 struct ivtv_buffer *buf;
 379                 int rc;
 380
 381                 buf = ivtv_get_buffer(s, non_block, &rc);
 382                 if (buf == NULL && rc == -EAGAIN && tot_written)
 383                         break;
 384                 if (buf == NULL)
 385                         return rc;
 386                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 387                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 388                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 389                 }
 390                 else if (buf->readpos == buf->bytesused) {
 391                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 392                         itv->vbi.sliced_mpeg_size[idx] = 0;
 393                         itv->vbi.inserted_frame++;
 394                         itv->vbi_data_inserted += buf->bytesused;
 395                 }
 396                 if (rc < 0)
 397                         return rc;
 398                 tot_written += rc;
 399
 400                 if (tot_written == tot_count || single_frame)
 401                         break;
 402         }
 403         return tot_written;
 404 }
 405
 406 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 407                         loff_t *pos, int non_block)
 408 {
 409         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 410         struct ivtv *itv = s->itv;
 411
 412         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 413         if (rc > 0)
 414                 pos += rc;
 415         return rc;
 416 }
 417
 418 int ivtv_start_capture(struct ivtv_open_id *id)
 419 {
 420         struct ivtv *itv = id->itv;
 421         struct ivtv_stream *s = &itv->streams[id->type];
 422         struct ivtv_stream *s_vbi;
 423
 424         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 425             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 426             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 427             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 428                 /* you cannot read from these stream types. */
 429                 return -EPERM;
 430         }
 431
 432         /* Try to claim this stream. */
 433         if (ivtv_claim_stream(id, s->type))
 434                 return -EBUSY;
 435
 436         /* This stream does not need to start capturing */
 437         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 438                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 439                 return 0;
 440         }
 441
 442         /* If capture is already in progress, then we also have to
 443            do nothing extra. */
 444         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 445                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 446                 return 0;
 447         }
 448
 449         /* Start VBI capture if required */
 450         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 451         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 452             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 453             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 454                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 455                    automatically when the MPG stream is claimed.
 456                    We only need to start the VBI capturing. */
 457                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 458                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 459
 460                         /* Failure, clean up and return an error */
 461                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 462                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 463                         /* also releases the associated VBI stream */
 464                         ivtv_release_stream(s);
 465                         return -EIO;
 466                 }
 467                 IVTV_DEBUG_INFO("VBI insertion started\n");
 468         }
 469
 470         /* Tell the card to start capturing */
 471         if (!ivtv_start_v4l2_encode_stream(s)) {
 472                 /* We're done */
 473                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 474                 /* Resume a possibly paused encoder */
 475                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 476                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 477                 return 0;
 478         }
 479
 480         /* failure, clean up */
 481         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 482
 483         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 484            automatically when the MPG stream is released.
 485            We only need to stop the VBI capturing. */
 486         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 487             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 488                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 489                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 490         }
 491         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 492         ivtv_release_stream(s);
 493         return -EIO;
 494 }
 495
 496 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 497 {
 498         struct ivtv_open_id *id = filp->private_data;
 499         struct ivtv *itv = id->itv;
 500         struct ivtv_stream *s = &itv->streams[id->type];
 501         int rc;
 502
 503         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 504
 505         rc = ivtv_start_capture(id);
 506         if (rc)
 507                 return rc;
 508         return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 509 }
 510
 511 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 512 {
 513         struct ivtv *itv = id->itv;
 514         struct ivtv_stream *s = &itv->streams[id->type];
 515
 516         if (atomic_read(&itv->decoding) == 0) {
 517                 if (ivtv_claim_stream(id, s->type)) {
 518                         /* someone else is using this stream already */
 519                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 520                         return -EBUSY;
 521                 }
 522                 ivtv_start_v4l2_decode_stream(s, 0);
 523         }
 524         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 525                 return ivtv_set_speed(itv, speed);
 526         return 0;
 527 }
 528
 529 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 530 {
 531         struct ivtv_open_id *id = filp->private_data;
 532         struct ivtv *itv = id->itv;
 533         struct ivtv_stream *s = &itv->streams[id->type];
 534         struct ivtv_buffer *buf;
 535         struct ivtv_queue q;
 536         int bytes_written = 0;
 537         int mode;
 538         int rc;
 539         DEFINE_WAIT(wait);
 540
 541         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 542
 543         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 544             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 545             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 546                 /* not decoder streams */
 547                 return -EPERM;
 548
 549         /* Try to claim this stream */
 550         if (ivtv_claim_stream(id, s->type))
 551                 return -EBUSY;
 552
 553         /* This stream does not need to start any decoding */
 554         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 555                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 556                 return ivtv_write_vbi(itv, user_buf, count);
 557         }
 558
 559         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 560
 561         if (ivtv_set_output_mode(itv, mode) != mode) {
 562             ivtv_release_stream(s);
 563             return -EBUSY;
 564         }
 565         ivtv_queue_init(&q);
 566         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 567
 568 retry:
 569         for (;;) {
 570                 /* Gather buffers */
 571                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 572                         ivtv_enqueue(s, buf, &q);
 573                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 574                         ivtv_enqueue(s, buf, &q);
 575                 }
 576                 if (q.buffers)
 577                         break;
 578                 if (filp->f_flags & O_NONBLOCK)
 579                         return -EAGAIN;
 580                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 581                 /* New buffers might have become free before we were added to the waitqueue */
 582                 if (!s->q_free.buffers)
 583                         schedule();
 584                 finish_wait(&s->waitq, &wait);
 585                 if (signal_pending(current)) {
 586                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 587                         return -EINTR;
 588                 }
 589         }
 590
 591         /* copy user data into buffers */
 592         while ((buf = ivtv_dequeue(s, &q))) {
 593                 /* Make sure we really got all the user data */
 594                 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 595
 596                 if (rc < 0) {
 597                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 598                         return rc;
 599                 }
 600                 user_buf += rc;
 601                 count -= rc;
 602                 bytes_written += rc;
 603
 604                 if (buf->bytesused != s->buf_size) {
 605                         /* incomplete, leave in q_io for next time */
 606                         ivtv_enqueue(s, buf, &s->q_io);
 607                         break;
 608                 }
 609                 /* Byteswap MPEG buffer */
 610                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 611                         ivtv_buf_swap(buf);
 612                 ivtv_enqueue(s, buf, &s->q_full);
 613         }
 614
 615         /* Start decoder (returns 0 if already started) */
 616         rc = ivtv_start_decoding(id, itv->speed);
 617         if (rc) {
 618                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 619
 620                 /* failure, clean up */
 621                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 622                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 623                 return rc;
 624         }
 625         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 626                 if (s->q_full.length >= itv->dma_data_req_size) {
 627                         int got_sig;
 628
 629                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 630                         while (!(got_sig = signal_pending(current)) &&
 631                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 632                                 schedule();
 633                         }
 634                         finish_wait(&itv->dma_waitq, &wait);
 635                         if (got_sig) {
 636                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 637                                 return -EINTR;
 638                         }
 639
 640                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 641                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 642                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 643                 }
 644         }
 645         /* more user data is available, wait until buffers become free
 646            to transfer the rest. */
 647         if (count && !(filp->f_flags & O_NONBLOCK))
 648                 goto retry;
 649         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 650         return bytes_written;
 651 }
 652
 653 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 654 {
 655         struct ivtv_open_id *id = filp->private_data;
 656         struct ivtv *itv = id->itv;
 657         struct ivtv_stream *s = &itv->streams[id->type];
 658         int res = 0;
 659
 660         /* add stream's waitq to the poll list */
 661         IVTV_DEBUG_HI_FILE("Decoder poll\n");
 662         poll_wait(filp, &s->waitq, wait);
 663
 664         set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 665         if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 666             test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 667                 res = POLLPRI;
 668
 669         /* Allow write if buffers are available for writing */
 670         if (s->q_free.buffers)
 671                 res |= POLLOUT | POLLWRNORM;
 672         return res;
 673 }
 674
 675 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 676 {
 677         struct ivtv_open_id *id = filp->private_data;
 678         struct ivtv *itv = id->itv;
 679         struct ivtv_stream *s = &itv->streams[id->type];
 680         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 681
 682         /* Start a capture if there is none */
 683         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 684                 int rc = ivtv_start_capture(id);
 685
 686                 if (rc) {
 687                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 688                                         s->name, rc);
 689                         return POLLERR;
 690                 }
 691                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 692         }
 693
 694         /* add stream's waitq to the poll list */
 695         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 696         poll_wait(filp, &s->waitq, wait);
 697
 698         if (eof || s->q_full.length)
 699                 return POLLIN | POLLRDNORM;
 700         return 0;
 701 }
 702
 703 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 704 {
 705         struct ivtv *itv = id->itv;
 706         struct ivtv_stream *s = &itv->streams[id->type];
 707
 708         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 709
 710         /* 'Unclaim' this stream */
 711
 712         /* Stop capturing */
 713         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 714                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 715
 716                 IVTV_DEBUG_INFO("close stopping capture\n");
 717                 /* Special case: a running VBI capture for VBI insertion
 718                    in the mpeg stream. Need to stop that too. */
 719                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 720                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 721                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 722                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 723                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 724                 }
 725                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 726                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 727                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 728                         /* Also used internally, don't stop capturing */
 729                         s->id = -1;
 730                 }
 731                 else {
 732                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 733                 }
 734         }
 735         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 736         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 737
 738         ivtv_release_stream(s);
 739 }
 740
 741 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 742 {
 743         struct ivtv *itv = id->itv;
 744         struct ivtv_stream *s = &itv->streams[id->type];
 745
 746         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 747
 748         /* Stop decoding */
 749         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 750                 IVTV_DEBUG_INFO("close stopping decode\n");
 751
 752                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 753         }
 754         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 755         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 756         if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 757                 /* Restore registers we've changed & clean up any mess we've made */
 758                 ivtv_yuv_close(itv);
 759         }
 760         if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_YUV)
 761                 itv->output_mode = OUT_NONE;
 762         else if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_UDMA_YUV)
 763                 itv->output_mode = OUT_NONE;
 764         else if (s->type == IVTV_DEC_STREAM_TYPE_MPG && itv->output_mode == OUT_MPG)
 765                 itv->output_mode = OUT_NONE;
 766
 767         itv->speed = 0;
 768         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 769         ivtv_release_stream(s);
 770 }
 771
 772 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
 773 {
 774         struct ivtv_open_id *id = filp->private_data;
 775         struct ivtv *itv = id->itv;
 776         struct ivtv_stream *s = &itv->streams[id->type];
 777
 778         IVTV_DEBUG_FILE("close %s\n", s->name);
 779
 780         v4l2_prio_close(&itv->prio, &id->prio);
 781
 782         /* Easy case first: this stream was never claimed by us */
 783         if (s->id != id->open_id) {
 784                 kfree(id);
 785                 return 0;
 786         }
 787
 788         /* 'Unclaim' this stream */
 789
 790         /* Stop radio */
 791         if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
 792                 /* Closing radio device, return to TV mode */
 793                 ivtv_mute(itv);
 794                 /* Mark that the radio is no longer in use */
 795                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 796                 /* Switch tuner to TV */
 797                 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
 798                 /* Select correct audio input (i.e. TV tuner or Line in) */
 799                 ivtv_audio_set_io(itv);
 800                 if (itv->hw_flags & IVTV_HW_SAA711X)
 801                 {
 802                         struct v4l2_crystal_freq crystal_freq;
 803                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 804                         crystal_freq.flags = 0;
 805                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 806                 }
 807                 /* Done! Unmute and continue. */
 808                 ivtv_unmute(itv);
 809                 ivtv_release_stream(s);
 810         } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 811                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 812
 813                 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
 814
 815                 /* If all output streams are closed, and if the user doesn't have
 816                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
 817                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 818                         /* disable VBI on TV-out */
 819                         ivtv_disable_vbi(itv);
 820                 }
 821         } else {
 822                 ivtv_stop_capture(id, 0);
 823         }
 824         kfree(id);
 825         return 0;
 826 }
 827
 828 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
 829 {
 830         int x, y = 0;
 831         struct ivtv_open_id *item;
 832         struct ivtv *itv = NULL;
 833         struct ivtv_stream *s = NULL;
 834         int minor = iminor(inode);
 835
 836         /* Find which card this open was on */
 837         spin_lock(&ivtv_cards_lock);
 838         for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
 839                 /* find out which stream this open was on */
 840                 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
 841                         s = &ivtv_cards[x]->streams[y];
 842                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 843                                 itv = ivtv_cards[x];
 844                                 break;
 845                         }
 846                 }
 847         }
 848         spin_unlock(&ivtv_cards_lock);
 849
 850         if (itv == NULL) {
 851                 /* Couldn't find a device registered
 852                    on that minor, shouldn't happen! */
 853                 IVTV_WARN("No ivtv device found on minor %d\n", minor);
 854                 return -ENXIO;
 855         }
 856
 857         if (ivtv_init_on_first_open(itv)) {
 858                 IVTV_ERR("Failed to initialize on minor %d\n", minor);
 859                 return -ENXIO;
 860         }
 861         IVTV_DEBUG_FILE("open %s\n", s->name);
 862
 863         if (y == IVTV_DEC_STREAM_TYPE_MPG &&
 864                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 865                 return -EBUSY;
 866
 867         if (y == IVTV_DEC_STREAM_TYPE_YUV &&
 868                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 869                 return -EBUSY;
 870
 871         if (y == IVTV_DEC_STREAM_TYPE_YUV) {
 872                 if (read_reg(0x82c) == 0) {
 873                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 874                         /* return -ENODEV; */
 875                 }
 876                 ivtv_udma_alloc(itv);
 877         }
 878
 879         /* Allocate memory */
 880         item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 881         if (NULL == item) {
 882                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 883                 return -ENOMEM;
 884         }
 885         item->itv = itv;
 886         item->type = y;
 887         v4l2_prio_open(&itv->prio, &item->prio);
 888
 889         item->open_id = itv->open_id++;
 890         filp->private_data = item;
 891
 892         if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
 893                 /* Try to claim this stream */
 894                 if (ivtv_claim_stream(item, item->type)) {
 895                         /* No, it's already in use */
 896                         kfree(item);
 897                         return -EBUSY;
 898                 }
 899
 900                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
 901                         if (atomic_read(&itv->capturing) > 0) {
 902                                 /* switching to radio while capture is
 903                                    in progress is not polite */
 904                                 kfree(item);
 905                                 return -EBUSY;
 906                         }
 907                 }
 908                 /* Mark that the radio is being used. */
 909                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 910                 /* We have the radio */
 911                 ivtv_mute(itv);
 912                 /* Switch tuner to radio */
 913                 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
 914                 /* Select the correct audio input (i.e. radio tuner) */
 915                 ivtv_audio_set_io(itv);
 916                 if (itv->hw_flags & IVTV_HW_SAA711X)
 917                 {
 918                         struct v4l2_crystal_freq crystal_freq;
 919                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 920                         crystal_freq.flags = SAA7115_FREQ_FL_APLL;
 921                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 922                 }
 923                 /* Done! Unmute and continue. */
 924                 ivtv_unmute(itv);
 925         }
 926
 927         /* YUV or MPG Decoding Mode? */
 928         if (y == IVTV_DEC_STREAM_TYPE_MPG)
 929                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 930         else if (y == IVTV_DEC_STREAM_TYPE_YUV)
 931         {
 932                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 933         }
 934
 935         return 0;
 936 }
 937
 938 void ivtv_mute(struct ivtv *itv)
 939 {
 940         if (atomic_read(&itv->capturing))
 941                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
 942         IVTV_DEBUG_INFO("Mute\n");
 943 }
 944
 945 void ivtv_unmute(struct ivtv *itv)
 946 {
 947         if (atomic_read(&itv->capturing)) {
 948                 ivtv_msleep_timeout(100, 0);
 949                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
 950                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
 951         }
 952         IVTV_DEBUG_INFO("Unmute\n");
 953 }