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-ioctl.h"
  34 #include "ivtv-cards.h"
  35 #include <media/saa7115.h>
  36
  37 /* This function tries to claim the stream for a specific file descriptor.
  38    If no one else is using this stream then the stream is claimed and
  39    associated VBI streams are also automatically claimed.
  40    Possible error returns: -EBUSY if someone else has claimed
  41    the stream or 0 on success. */
  42 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  43 {
  44         struct ivtv *itv = id->itv;
  45         struct ivtv_stream *s = &itv->streams[type];
  46         struct ivtv_stream *s_vbi;
  47         int vbi_type;
  48
  49         if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
  50                 /* someone already claimed this stream */
  51                 if (s->id == id->open_id) {
  52                         /* yes, this file descriptor did. So that's OK. */
  53                         return 0;
  54                 }
  55                 if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
  56                                          type == IVTV_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                         IVTV_DEBUG_INFO("Start Read VBI\n");
  62                         return 0;
  63                 }
  64                 /* someone else is using this stream already */
  65                 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  66                 return -EBUSY;
  67         }
  68         s->id = id->open_id;
  69         if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  70                 /* Enable reinsertion interrupt */
  71                 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  72         }
  73
  74         /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  75            IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  76            (provided VBI insertion is on and sliced VBI is selected), for all
  77            other streams we're done */
  78         if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  79                 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  80         } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  81                    itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
  82                 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  83         } else {
  84                 return 0;
  85         }
  86         s_vbi = &itv->streams[vbi_type];
  87
  88         if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  89                 /* Enable reinsertion interrupt */
  90                 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  91                         ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  92         }
  93         /* mark that it is used internally */
  94         set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  95         return 0;
  96 }
  97
  98 /* This function releases a previously claimed stream. It will take into
  99    account associated VBI streams. */
 100 void ivtv_release_stream(struct ivtv_stream *s)
 101 {
 102         struct ivtv *itv = s->itv;
 103         struct ivtv_stream *s_vbi;
 104
 105         s->id = -1;
 106         if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 107                 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 108                 /* this stream is still in use internally */
 109                 return;
 110         }
 111         if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 112                 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 113                 return;
 114         }
 115
 116         ivtv_flush_queues(s);
 117
 118         /* disable reinsertion interrupt */
 119         if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 120                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 121
 122         /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 123            IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 124            for all other streams we're done */
 125         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 126                 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 127         else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 128                 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 129         else
 130                 return;
 131
 132         /* clear internal use flag */
 133         if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 134                 /* was already cleared */
 135                 return;
 136         }
 137         if (s_vbi->id != -1) {
 138                 /* VBI stream still claimed by a file descriptor */
 139                 return;
 140         }
 141         /* disable reinsertion interrupt */
 142         if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 143                 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 144         clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 145         ivtv_flush_queues(s_vbi);
 146 }
 147
 148 static void ivtv_dualwatch(struct ivtv *itv)
 149 {
 150         struct v4l2_tuner vt;
 151         u16 new_bitmap;
 152         u16 new_stereo_mode;
 153         const u16 stereo_mask = 0x0300;
 154         const u16 dual = 0x0200;
 155
 156         new_stereo_mode = itv->params.audio_properties & stereo_mask;
 157         memset(&vt, 0, sizeof(vt));
 158         ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
 159         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 160                 new_stereo_mode = dual;
 161
 162         if (new_stereo_mode == itv->dualwatch_stereo_mode)
 163                 return;
 164
 165         new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
 166
 167         IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
 168                            itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 169
 170         if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
 171                 itv->dualwatch_stereo_mode = new_stereo_mode;
 172                 return;
 173         }
 174         IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 175 }
 176
 177 static void ivtv_update_pgm_info(struct ivtv *itv)
 178 {
 179         u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 180         int cnt;
 181         int i = 0;
 182
 183         if (wr_idx >= itv->pgm_info_num) {
 184                 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 185                 return;
 186         }
 187         cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 188         while (i < cnt) {
 189                 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 190                 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 191                 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 192                 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 193                         V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 194                                         // 1=I, 2=P, 4=B
 195
 196                 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 197                 if (e->offset > itv->mpg_data_received) {
 198                         break;
 199                 }
 200                 e->offset += itv->vbi_data_inserted;
 201                 e->length = read_enc(addr);
 202                 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 203                 e->flags = mapping[read_enc(addr + 12) & 7];
 204                 i++;
 205         }
 206         itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 207 }
 208
 209 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 210 {
 211         struct ivtv *itv = s->itv;
 212         struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 213         struct ivtv_buffer *buf;
 214         DEFINE_WAIT(wait);
 215
 216         *err = 0;
 217         while (1) {
 218                 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 219                         /* Process pending program info updates and pending VBI data */
 220                         ivtv_update_pgm_info(itv);
 221
 222                         if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
 223                                 itv->dualwatch_jiffies = jiffies;
 224                                 ivtv_dualwatch(itv);
 225                         }
 226
 227                         if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 228                             !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 229                                 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 230                                         /* byteswap and process VBI data */
 231                                         ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 232                                         ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 233                                 }
 234                         }
 235                         buf = &itv->vbi.sliced_mpeg_buf;
 236                         if (buf->readpos != buf->bytesused) {
 237                                 return buf;
 238                         }
 239                 }
 240
 241                 /* do we have leftover data? */
 242                 buf = ivtv_dequeue(s, &s->q_io);
 243                 if (buf)
 244                         return buf;
 245
 246                 /* do we have new data? */
 247                 buf = ivtv_dequeue(s, &s->q_full);
 248                 if (buf) {
 249                         if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 250                                 return buf;
 251                         buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 252                         if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 253                                 /* byteswap MPG data */
 254                                 ivtv_buf_swap(buf);
 255                         else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 256                                 /* byteswap and process VBI data */
 257                                 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 258                         }
 259                         return buf;
 260                 }
 261                 /* return if file was opened with O_NONBLOCK */
 262                 if (non_block) {
 263                         *err = -EAGAIN;
 264                         return NULL;
 265                 }
 266
 267                 /* return if end of stream */
 268                 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 269                         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 270                         IVTV_DEBUG_INFO("EOS %s\n", s->name);
 271                         return NULL;
 272                 }
 273
 274                 /* wait for more data to arrive */
 275                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 276                 /* New buffers might have become available before we were added to the waitqueue */
 277                 if (!s->q_full.buffers)
 278                         schedule();
 279                 finish_wait(&s->waitq, &wait);
 280                 if (signal_pending(current)) {
 281                         /* return if a signal was received */
 282                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 283                         *err = -EINTR;
 284                         return NULL;
 285                 }
 286         }
 287 }
 288
 289 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 290 {
 291         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 292
 293         itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 294         itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 295         itv->vbi.sliced_mpeg_buf.readpos = 0;
 296 }
 297
 298 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 299                 char __user *ubuf, size_t ucount)
 300 {
 301         struct ivtv *itv = s->itv;
 302         size_t len = buf->bytesused - buf->readpos;
 303
 304         if (len > ucount) len = ucount;
 305         if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 306             itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
 307                 const char *start = buf->buf + buf->readpos;
 308                 const char *p = start + 1;
 309                 const u8 *q;
 310                 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 311                 int stuffing, i;
 312
 313                 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 314                         p = q + 1;
 315                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 316                             q[1] != 0 || q[2] != 1 || q[3] != ch) {
 317                                 continue;
 318                         }
 319                         if (!itv->search_pack_header) {
 320                                 if ((q[6] & 0xc0) != 0x80)
 321                                         continue;
 322                                 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 323                                     ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 324                                         ch = 0xba;
 325                                         itv->search_pack_header = 1;
 326                                         p = q + 9;
 327                                 }
 328                                 continue;
 329                         }
 330                         stuffing = q[13] & 7;
 331                         /* all stuffing bytes must be 0xff */
 332                         for (i = 0; i < stuffing; i++)
 333                                 if (q[14 + i] != 0xff)
 334                                         break;
 335                         if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 336                                         q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 337                                         q[16 + stuffing] == 1) {
 338                                 itv->search_pack_header = 0;
 339                                 len = (char *)q - start;
 340                                 ivtv_setup_sliced_vbi_buf(itv);
 341                                 break;
 342                         }
 343                 }
 344         }
 345         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 346                 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 347                 return -EFAULT;
 348         }
 349         /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 350                         buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 351                         buf == &itv->vbi.sliced_mpeg_buf); */
 352         buf->readpos += len;
 353         if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 354                 itv->mpg_data_received += len;
 355         return len;
 356 }
 357
 358 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 359 {
 360         struct ivtv *itv = s->itv;
 361         size_t tot_written = 0;
 362         int single_frame = 0;
 363
 364         if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
 365                 /* shouldn't happen */
 366                 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 367                 return -EIO;
 368         }
 369
 370         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 371            arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 372         if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 373                         (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
 374                 single_frame = 1;
 375
 376         for (;;) {
 377                 struct ivtv_buffer *buf;
 378                 int rc;
 379
 380                 buf = ivtv_get_buffer(s, non_block, &rc);
 381                 if (buf == NULL && rc == -EAGAIN && tot_written)
 382                         break;
 383                 if (buf == NULL)
 384                         return rc;
 385                 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 386                 if (buf != &itv->vbi.sliced_mpeg_buf) {
 387                         ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 388                 }
 389                 else if (buf->readpos == buf->bytesused) {
 390                         int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 391                         itv->vbi.sliced_mpeg_size[idx] = 0;
 392                         itv->vbi.inserted_frame++;
 393                         itv->vbi_data_inserted += buf->bytesused;
 394                 }
 395                 if (rc < 0)
 396                         return rc;
 397                 tot_written += rc;
 398
 399                 if (tot_written == tot_count || single_frame)
 400                         break;
 401         }
 402         return tot_written;
 403 }
 404
 405 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 406                         loff_t *pos, int non_block)
 407 {
 408         ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 409         struct ivtv *itv = s->itv;
 410
 411         IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 412         if (rc > 0)
 413                 pos += rc;
 414         return rc;
 415 }
 416
 417 int ivtv_start_capture(struct ivtv_open_id *id)
 418 {
 419         struct ivtv *itv = id->itv;
 420         struct ivtv_stream *s = &itv->streams[id->type];
 421         struct ivtv_stream *s_vbi;
 422
 423         if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 424             s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 425             s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 426             s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 427                 /* you cannot read from these stream types. */
 428                 return -EPERM;
 429         }
 430
 431         /* Try to claim this stream. */
 432         if (ivtv_claim_stream(id, s->type))
 433                 return -EBUSY;
 434
 435         /* This stream does not need to start capturing */
 436         if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 437                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 438                 return 0;
 439         }
 440
 441         /* If capture is already in progress, then we also have to
 442            do nothing extra. */
 443         if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 444                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 445                 return 0;
 446         }
 447
 448         /* Start VBI capture if required */
 449         s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 450         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 451             test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 452             !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 453                 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 454                    automatically when the MPG stream is claimed.
 455                    We only need to start the VBI capturing. */
 456                 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 457                         IVTV_DEBUG_WARN("VBI capture start failed\n");
 458
 459                         /* Failure, clean up and return an error */
 460                         clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 461                         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 462                         /* also releases the associated VBI stream */
 463                         ivtv_release_stream(s);
 464                         return -EIO;
 465                 }
 466                 IVTV_DEBUG_INFO("VBI insertion started\n");
 467         }
 468
 469         /* Tell the card to start capturing */
 470         if (!ivtv_start_v4l2_encode_stream(s)) {
 471                 /* We're done */
 472                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 473                 /* Resume a possibly paused encoder */
 474                 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 475                         ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 476                 return 0;
 477         }
 478
 479         /* failure, clean up */
 480         IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 481
 482         /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 483            automatically when the MPG stream is released.
 484            We only need to stop the VBI capturing. */
 485         if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 486             test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 487                 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 488                 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 489         }
 490         clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 491         ivtv_release_stream(s);
 492         return -EIO;
 493 }
 494
 495 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 496 {
 497         struct ivtv_open_id *id = filp->private_data;
 498         struct ivtv *itv = id->itv;
 499         struct ivtv_stream *s = &itv->streams[id->type];
 500         int rc;
 501
 502         IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 503
 504         mutex_lock(&itv->serialize_lock);
 505         rc = ivtv_start_capture(id);
 506         mutex_unlock(&itv->serialize_lock);
 507         if (rc)
 508                 return rc;
 509         return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 510 }
 511
 512 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 513 {
 514         struct ivtv *itv = id->itv;
 515         struct ivtv_stream *s = &itv->streams[id->type];
 516
 517         if (atomic_read(&itv->decoding) == 0) {
 518                 if (ivtv_claim_stream(id, s->type)) {
 519                         /* someone else is using this stream already */
 520                         IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 521                         return -EBUSY;
 522                 }
 523                 ivtv_start_v4l2_decode_stream(s, 0);
 524         }
 525         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 526                 return ivtv_set_speed(itv, speed);
 527         return 0;
 528 }
 529
 530 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 531 {
 532         struct ivtv_open_id *id = filp->private_data;
 533         struct ivtv *itv = id->itv;
 534         struct ivtv_stream *s = &itv->streams[id->type];
 535         struct ivtv_buffer *buf;
 536         struct ivtv_queue q;
 537         int bytes_written = 0;
 538         int mode;
 539         int rc;
 540         DEFINE_WAIT(wait);
 541
 542         IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 543
 544         if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 545             s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 546             s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 547                 /* not decoder streams */
 548                 return -EPERM;
 549
 550         /* Try to claim this stream */
 551         if (ivtv_claim_stream(id, s->type))
 552                 return -EBUSY;
 553
 554         /* This stream does not need to start any decoding */
 555         if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 556                 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 557                 return ivtv_write_vbi(itv, user_buf, count);
 558         }
 559
 560         mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 561
 562         if (ivtv_set_output_mode(itv, mode) != mode) {
 563             ivtv_release_stream(s);
 564             return -EBUSY;
 565         }
 566         ivtv_queue_init(&q);
 567         set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 568
 569 retry:
 570         for (;;) {
 571                 /* Gather buffers */
 572                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 573                         ivtv_enqueue(s, buf, &q);
 574                 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 575                         ivtv_enqueue(s, buf, &q);
 576                 }
 577                 if (q.buffers)
 578                         break;
 579                 if (filp->f_flags & O_NONBLOCK)
 580                         return -EAGAIN;
 581                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 582                 /* New buffers might have become free before we were added to the waitqueue */
 583                 if (!s->q_free.buffers)
 584                         schedule();
 585                 finish_wait(&s->waitq, &wait);
 586                 if (signal_pending(current)) {
 587                         IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 588                         return -EINTR;
 589                 }
 590         }
 591
 592         /* copy user data into buffers */
 593         while ((buf = ivtv_dequeue(s, &q))) {
 594                 /* Make sure we really got all the user data */
 595                 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 596
 597                 if (rc < 0) {
 598                         ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 599                         return rc;
 600                 }
 601                 user_buf += rc;
 602                 count -= rc;
 603                 bytes_written += rc;
 604
 605                 if (buf->bytesused != s->buf_size) {
 606                         /* incomplete, leave in q_io for next time */
 607                         ivtv_enqueue(s, buf, &s->q_io);
 608                         break;
 609                 }
 610                 /* Byteswap MPEG buffer */
 611                 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 612                         ivtv_buf_swap(buf);
 613                 ivtv_enqueue(s, buf, &s->q_full);
 614         }
 615
 616         /* Start decoder (returns 0 if already started) */
 617         mutex_lock(&itv->serialize_lock);
 618         rc = ivtv_start_decoding(id, itv->speed);
 619         mutex_unlock(&itv->serialize_lock);
 620         if (rc) {
 621                 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 622
 623                 /* failure, clean up */
 624                 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 625                 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 626                 return rc;
 627         }
 628         if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 629                 if (s->q_full.length >= itv->dma_data_req_size) {
 630                         int got_sig;
 631
 632                         prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 633                         while (!(got_sig = signal_pending(current)) &&
 634                                         test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 635                                 schedule();
 636                         }
 637                         finish_wait(&itv->dma_waitq, &wait);
 638                         if (got_sig) {
 639                                 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 640                                 return -EINTR;
 641                         }
 642
 643                         clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 644                         ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 645                         ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 646                 }
 647         }
 648         /* more user data is available, wait until buffers become free
 649            to transfer the rest. */
 650         if (count && !(filp->f_flags & O_NONBLOCK))
 651                 goto retry;
 652         IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 653         return bytes_written;
 654 }
 655
 656 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 657 {
 658         struct ivtv_open_id *id = filp->private_data;
 659         struct ivtv *itv = id->itv;
 660         struct ivtv_stream *s = &itv->streams[id->type];
 661         int res = 0;
 662
 663         /* add stream's waitq to the poll list */
 664         IVTV_DEBUG_HI_FILE("Decoder poll\n");
 665         poll_wait(filp, &s->waitq, wait);
 666
 667         set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 668         if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 669             test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 670                 res = POLLPRI;
 671
 672         /* Allow write if buffers are available for writing */
 673         if (s->q_free.buffers)
 674                 res |= POLLOUT | POLLWRNORM;
 675         return res;
 676 }
 677
 678 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 679 {
 680         struct ivtv_open_id *id = filp->private_data;
 681         struct ivtv *itv = id->itv;
 682         struct ivtv_stream *s = &itv->streams[id->type];
 683         int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 684
 685         /* Start a capture if there is none */
 686         if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 687                 int rc;
 688
 689                 mutex_lock(&itv->serialize_lock);
 690                 rc = ivtv_start_capture(id);
 691                 mutex_unlock(&itv->serialize_lock);
 692                 if (rc) {
 693                         IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 694                                         s->name, rc);
 695                         return POLLERR;
 696                 }
 697                 IVTV_DEBUG_FILE("Encoder poll started capture\n");
 698         }
 699
 700         /* add stream's waitq to the poll list */
 701         IVTV_DEBUG_HI_FILE("Encoder poll\n");
 702         poll_wait(filp, &s->waitq, wait);
 703
 704         if (eof || s->q_full.length)
 705                 return POLLIN | POLLRDNORM;
 706         return 0;
 707 }
 708
 709 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 710 {
 711         struct ivtv *itv = id->itv;
 712         struct ivtv_stream *s = &itv->streams[id->type];
 713
 714         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 715
 716         /* 'Unclaim' this stream */
 717
 718         /* Stop capturing */
 719         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 720                 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 721
 722                 IVTV_DEBUG_INFO("close stopping capture\n");
 723                 /* Special case: a running VBI capture for VBI insertion
 724                    in the mpeg stream. Need to stop that too. */
 725                 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 726                     test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 727                     !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 728                         IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 729                         ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 730                 }
 731                 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 732                      id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 733                     test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 734                         /* Also used internally, don't stop capturing */
 735                         s->id = -1;
 736                 }
 737                 else {
 738                         ivtv_stop_v4l2_encode_stream(s, gop_end);
 739                 }
 740         }
 741         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 742         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 743
 744         ivtv_release_stream(s);
 745 }
 746
 747 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 748 {
 749         struct ivtv *itv = id->itv;
 750         struct ivtv_stream *s = &itv->streams[id->type];
 751
 752         IVTV_DEBUG_FILE("close() of %s\n", s->name);
 753
 754         /* Stop decoding */
 755         if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 756                 IVTV_DEBUG_INFO("close stopping decode\n");
 757
 758                 ivtv_stop_v4l2_decode_stream(s, flags, pts);
 759                 itv->output_mode = OUT_NONE;
 760         }
 761         clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 762         clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 763         if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 764                 /* Restore registers we've changed & clean up any mess we've made */
 765                 ivtv_yuv_close(itv);
 766         }
 767         if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 768                 itv->output_mode = OUT_NONE;
 769
 770         itv->speed = 0;
 771         clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 772         ivtv_release_stream(s);
 773 }
 774
 775 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
 776 {
 777         struct ivtv_open_id *id = filp->private_data;
 778         struct ivtv *itv = id->itv;
 779         struct ivtv_stream *s = &itv->streams[id->type];
 780
 781         IVTV_DEBUG_FILE("close %s\n", s->name);
 782
 783         v4l2_prio_close(&itv->prio, &id->prio);
 784
 785         /* Easy case first: this stream was never claimed by us */
 786         if (s->id != id->open_id) {
 787                 kfree(id);
 788                 return 0;
 789         }
 790
 791         /* 'Unclaim' this stream */
 792
 793         /* Stop radio */
 794         mutex_lock(&itv->serialize_lock);
 795         if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
 796                 /* Closing radio device, return to TV mode */
 797                 ivtv_mute(itv);
 798                 /* Mark that the radio is no longer in use */
 799                 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 800                 /* Switch tuner to TV */
 801                 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
 802                 /* Select correct audio input (i.e. TV tuner or Line in) */
 803                 ivtv_audio_set_io(itv);
 804                 if (itv->hw_flags & IVTV_HW_SAA711X)
 805                 {
 806                         struct v4l2_crystal_freq crystal_freq;
 807                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 808                         crystal_freq.flags = 0;
 809                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 810                 }
 811                 /* Done! Unmute and continue. */
 812                 ivtv_unmute(itv);
 813                 ivtv_release_stream(s);
 814         } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 815                 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 816
 817                 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
 818
 819                 /* If all output streams are closed, and if the user doesn't have
 820                    IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
 821                 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 822                         /* disable VBI on TV-out */
 823                         ivtv_disable_vbi(itv);
 824                 }
 825         } else {
 826                 ivtv_stop_capture(id, 0);
 827         }
 828         kfree(id);
 829         mutex_unlock(&itv->serialize_lock);
 830         return 0;
 831 }
 832
 833 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
 834 {
 835         struct ivtv *itv = s->itv;
 836         struct ivtv_open_id *item;
 837
 838         IVTV_DEBUG_FILE("open %s\n", s->name);
 839
 840         if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 841                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 842                 return -EBUSY;
 843
 844         if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 845                 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 846                 return -EBUSY;
 847
 848         if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 849                 if (read_reg(0x82c) == 0) {
 850                         IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 851                         /* return -ENODEV; */
 852                 }
 853                 ivtv_udma_alloc(itv);
 854         }
 855
 856         /* Allocate memory */
 857         item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 858         if (NULL == item) {
 859                 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 860                 return -ENOMEM;
 861         }
 862         item->itv = itv;
 863         item->type = s->type;
 864         v4l2_prio_open(&itv->prio, &item->prio);
 865
 866         item->open_id = itv->open_id++;
 867         filp->private_data = item;
 868
 869         if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
 870                 /* Try to claim this stream */
 871                 if (ivtv_claim_stream(item, item->type)) {
 872                         /* No, it's already in use */
 873                         kfree(item);
 874                         return -EBUSY;
 875                 }
 876
 877                 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
 878                         if (atomic_read(&itv->capturing) > 0) {
 879                                 /* switching to radio while capture is
 880                                    in progress is not polite */
 881                                 kfree(item);
 882                                 return -EBUSY;
 883                         }
 884                 }
 885                 /* Mark that the radio is being used. */
 886                 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 887                 /* We have the radio */
 888                 ivtv_mute(itv);
 889                 /* Switch tuner to radio */
 890                 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
 891                 /* Select the correct audio input (i.e. radio tuner) */
 892                 ivtv_audio_set_io(itv);
 893                 if (itv->hw_flags & IVTV_HW_SAA711X)
 894                 {
 895                         struct v4l2_crystal_freq crystal_freq;
 896                         crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
 897                         crystal_freq.flags = SAA7115_FREQ_FL_APLL;
 898                         ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
 899                 }
 900                 /* Done! Unmute and continue. */
 901                 ivtv_unmute(itv);
 902         }
 903
 904         /* YUV or MPG Decoding Mode? */
 905         if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 906                 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 907         else if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
 908                 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
 909         return 0;
 910 }
 911
 912 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
 913 {
 914         int res, x, y = 0;
 915         struct ivtv *itv = NULL;
 916         struct ivtv_stream *s = NULL;
 917         int minor = iminor(inode);
 918
 919         /* Find which card this open was on */
 920         spin_lock(&ivtv_cards_lock);
 921         for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
 922                 /* find out which stream this open was on */
 923                 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
 924                         s = &ivtv_cards[x]->streams[y];
 925                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 926                                 itv = ivtv_cards[x];
 927                                 break;
 928                         }
 929                 }
 930         }
 931         spin_unlock(&ivtv_cards_lock);
 932
 933         if (itv == NULL) {
 934                 /* Couldn't find a device registered
 935                    on that minor, shouldn't happen! */
 936                 IVTV_WARN("No ivtv device found on minor %d\n", minor);
 937                 return -ENXIO;
 938         }
 939
 940         mutex_lock(&itv->serialize_lock);
 941         if (ivtv_init_on_first_open(itv)) {
 942                 IVTV_ERR("Failed to initialize on minor %d\n", minor);
 943                 mutex_unlock(&itv->serialize_lock);
 944                 return -ENXIO;
 945         }
 946         res = ivtv_serialized_open(s, filp);
 947         mutex_unlock(&itv->serialize_lock);
 948         return res;
 949 }
 950
 951 void ivtv_mute(struct ivtv *itv)
 952 {
 953         if (atomic_read(&itv->capturing))
 954                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
 955         IVTV_DEBUG_INFO("Mute\n");
 956 }
 957
 958 void ivtv_unmute(struct ivtv *itv)
 959 {
 960         if (atomic_read(&itv->capturing)) {
 961                 ivtv_msleep_timeout(100, 0);
 962                 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
 963                 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
 964         }
 965         IVTV_DEBUG_INFO("Unmute\n");
 966 }