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ivtv-fileops.c

/*
    file operation functions
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "ivtv-driver.h"
#include "ivtv-fileops.h"
#include "ivtv-i2c.h"
#include "ivtv-queue.h"
#include "ivtv-udma.h"
#include "ivtv-irq.h"
#include "ivtv-vbi.h"
#include "ivtv-mailbox.h"
#include "ivtv-routing.h"
#include "ivtv-streams.h"
#include "ivtv-yuv.h"
#include "ivtv-ioctl.h"
#include "ivtv-cards.h"
#include <media/saa7115.h>

/* This function tries to claim the stream for a specific file descriptor.
   If no one else is using this stream then the stream is claimed and
   associated VBI streams are also automatically claimed.
   Possible error returns: -EBUSY if someone else has claimed
   the stream or 0 on success. */
int ivtv_claim_stream(struct ivtv_open_id *id, int type)
{
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[type];
      struct ivtv_stream *s_vbi;
      int vbi_type;

      if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
            /* someone already claimed this stream */
            if (s->id == id->open_id) {
                  /* yes, this file descriptor did. So that's OK. */
                  return 0;
            }
            if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
                               type == IVTV_ENC_STREAM_TYPE_VBI)) {
                  /* VBI is handled already internally, now also assign
                     the file descriptor to this stream for external
                     reading of the stream. */
                  s->id = id->open_id;
                  IVTV_DEBUG_INFO("Start Read VBI\n");
                  return 0;
            }
            /* someone else is using this stream already */
            IVTV_DEBUG_INFO("Stream %d is busy\n", type);
            return -EBUSY;
      }
      s->id = id->open_id;
      if (type == IVTV_DEC_STREAM_TYPE_VBI) {
            /* Enable reinsertion interrupt */
            ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
      }

      /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
         IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
         (provided VBI insertion is on and sliced VBI is selected), for all
         other streams we're done */
      if (type == IVTV_DEC_STREAM_TYPE_MPG) {
            vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
      } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
               itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
            vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
      } else {
            return 0;
      }
      s_vbi = &itv->streams[vbi_type];

      if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
            /* Enable reinsertion interrupt */
            if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
                  ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
      }
      /* mark that it is used internally */
      set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
      return 0;
}

/* This function releases a previously claimed stream. It will take into
   account associated VBI streams. */
void ivtv_release_stream(struct ivtv_stream *s)
{
      struct ivtv *itv = s->itv;
      struct ivtv_stream *s_vbi;

      s->id = -1;
      if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
            test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
            /* this stream is still in use internally */
            return;
      }
      if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
            IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
            return;
      }

      ivtv_flush_queues(s);

      /* disable reinsertion interrupt */
      if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
            ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);

      /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
         IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
         for all other streams we're done */
      if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
            s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
      else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
            s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
      else
            return;

      /* clear internal use flag */
      if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
            /* was already cleared */
            return;
      }
      if (s_vbi->id != -1) {
            /* VBI stream still claimed by a file descriptor */
            return;
      }
      /* disable reinsertion interrupt */
      if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
            ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
      clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
      ivtv_flush_queues(s_vbi);
}

static void ivtv_dualwatch(struct ivtv *itv)
{
      struct v4l2_tuner vt;
      u16 new_bitmap;
      u16 new_stereo_mode;
      const u16 stereo_mask = 0x0300;
      const u16 dual = 0x0200;

      new_stereo_mode = itv->params.audio_properties & stereo_mask;
      memset(&vt, 0, sizeof(vt));
      ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
      if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
            new_stereo_mode = dual;

      if (new_stereo_mode == itv->dualwatch_stereo_mode)
            return;

      new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);

      IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
                     itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);

      if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
            itv->dualwatch_stereo_mode = new_stereo_mode;
            return;
      }
      IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
}

static void ivtv_update_pgm_info(struct ivtv *itv)
{
      u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
      int cnt;
      int i = 0;

      if (wr_idx >= itv->pgm_info_num) {
            IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
            return;
      }
      cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
      while (i < cnt) {
            int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
            struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
            u32 addr = itv->pgm_info_offset + 4 + idx * 24;
            const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
                  V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
                              // 1=I, 2=P, 4=B

            e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
            if (e->offset > itv->mpg_data_received) {
                  break;
            }
            e->offset += itv->vbi_data_inserted;
            e->length = read_enc(addr);
            e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
            e->flags = mapping[read_enc(addr + 12) & 7];
            i++;
      }
      itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
}

static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
{
      struct ivtv *itv = s->itv;
      struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
      struct ivtv_buffer *buf;
      DEFINE_WAIT(wait);

      *err = 0;
      while (1) {
            if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
                  /* Process pending program info updates and pending VBI data */
                  ivtv_update_pgm_info(itv);

                  if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
                        itv->dualwatch_jiffies = jiffies;
                        ivtv_dualwatch(itv);
                  }

                  if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
                      !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
                        while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
                              /* byteswap and process VBI data */
                              ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
                              ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
                        }
                  }
                  buf = &itv->vbi.sliced_mpeg_buf;
                  if (buf->readpos != buf->bytesused) {
                        return buf;
                  }
            }

            /* do we have leftover data? */
            buf = ivtv_dequeue(s, &s->q_io);
            if (buf)
                  return buf;

            /* do we have new data? */
            buf = ivtv_dequeue(s, &s->q_full);
            if (buf) {
                  if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
                        return buf;
                  buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
                  if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
                        /* byteswap MPG data */
                        ivtv_buf_swap(buf);
                  else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
                        /* byteswap and process VBI data */
                        ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
                  }
                  return buf;
            }

            /* return if end of stream */
            if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
                  IVTV_DEBUG_INFO("EOS %s\n", s->name);
                  return NULL;
            }

            /* return if file was opened with O_NONBLOCK */
            if (non_block) {
                  *err = -EAGAIN;
                  return NULL;
            }

            /* wait for more data to arrive */
            prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
            /* New buffers might have become available before we were added to the waitqueue */
            if (!s->q_full.buffers)
                  schedule();
            finish_wait(&s->waitq, &wait);
            if (signal_pending(current)) {
                  /* return if a signal was received */
                  IVTV_DEBUG_INFO("User stopped %s\n", s->name);
                  *err = -EINTR;
                  return NULL;
            }
      }
}

static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
{
      int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;

      itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
      itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
      itv->vbi.sliced_mpeg_buf.readpos = 0;
}

static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
            char __user *ubuf, size_t ucount)
{
      struct ivtv *itv = s->itv;
      size_t len = buf->bytesused - buf->readpos;

      if (len > ucount) len = ucount;
      if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
          itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
            const char *start = buf->buf + buf->readpos;
            const char *p = start + 1;
            const u8 *q;
            u8 ch = itv->search_pack_header ? 0xba : 0xe0;
            int stuffing, i;

            while (start + len > p && (q = memchr(p, 0, start + len - p))) {
                  p = q + 1;
                  if ((char *)q + 15 >= buf->buf + buf->bytesused ||
                      q[1] != 0 || q[2] != 1 || q[3] != ch) {
                        continue;
                  }
                  if (!itv->search_pack_header) {
                        if ((q[6] & 0xc0) != 0x80)
                              continue;
                        if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
                            ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
                              ch = 0xba;
                              itv->search_pack_header = 1;
                              p = q + 9;
                        }
                        continue;
                  }
                  stuffing = q[13] & 7;
                  /* all stuffing bytes must be 0xff */
                  for (i = 0; i < stuffing; i++)
                        if (q[14 + i] != 0xff)
                              break;
                  if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
                              q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
                              q[16 + stuffing] == 1) {
                        itv->search_pack_header = 0;
                        len = (char *)q - start;
                        ivtv_setup_sliced_vbi_buf(itv);
                        break;
                  }
            }
      }
      if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
            IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
            return -EFAULT;
      }
      /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
                  buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
                  buf == &itv->vbi.sliced_mpeg_buf); */
      buf->readpos += len;
      if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
            itv->mpg_data_received += len;
      return len;
}

static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
{
      struct ivtv *itv = s->itv;
      size_t tot_written = 0;
      int single_frame = 0;

      if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
            /* shouldn't happen */
            IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
            return -EIO;
      }

      /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
         arrive one-by-one, so make sure we never output more than one VBI frame at a time */
      if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
                  (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
            single_frame = 1;

      for (;;) {
            struct ivtv_buffer *buf;
            int rc;

            buf = ivtv_get_buffer(s, non_block, &rc);
            /* if there is no data available... */
            if (buf == NULL) {
                  /* if we got data, then return that regardless */
                  if (tot_written)
                        break;
                  /* EOS condition */
                  if (rc == 0) {
                        clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
                        clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
                        ivtv_release_stream(s);
                  }
                  /* set errno */
                  return rc;
            }
            rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
            if (buf != &itv->vbi.sliced_mpeg_buf) {
                  ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
            }
            else if (buf->readpos == buf->bytesused) {
                  int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
                  itv->vbi.sliced_mpeg_size[idx] = 0;
                  itv->vbi.inserted_frame++;
                  itv->vbi_data_inserted += buf->bytesused;
            }
            if (rc < 0)
                  return rc;
            tot_written += rc;

            if (tot_written == tot_count || single_frame)
                  break;
      }
      return tot_written;
}

static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
                  loff_t *pos, int non_block)
{
      ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
      struct ivtv *itv = s->itv;

      IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
      if (rc > 0)
            pos += rc;
      return rc;
}

int ivtv_start_capture(struct ivtv_open_id *id)
{
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];
      struct ivtv_stream *s_vbi;

      if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
          s->type == IVTV_DEC_STREAM_TYPE_MPG ||
          s->type == IVTV_DEC_STREAM_TYPE_YUV ||
          s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
            /* you cannot read from these stream types. */
            return -EPERM;
      }

      /* Try to claim this stream. */
      if (ivtv_claim_stream(id, s->type))
            return -EBUSY;

      /* This stream does not need to start capturing */
      if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
            set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            return 0;
      }

      /* If capture is already in progress, then we also have to
         do nothing extra. */
      if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
            set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            return 0;
      }

      /* Start VBI capture if required */
      s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
      if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
          test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
          !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
            /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
               automatically when the MPG stream is claimed.
               We only need to start the VBI capturing. */
            if (ivtv_start_v4l2_encode_stream(s_vbi)) {
                  IVTV_DEBUG_WARN("VBI capture start failed\n");

                  /* Failure, clean up and return an error */
                  clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
                  clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
                  /* also releases the associated VBI stream */
                  ivtv_release_stream(s);
                  return -EIO;
            }
            IVTV_DEBUG_INFO("VBI insertion started\n");
      }

      /* Tell the card to start capturing */
      if (!ivtv_start_v4l2_encode_stream(s)) {
            /* We're done */
            set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            /* Resume a possibly paused encoder */
            if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
                  ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
            return 0;
      }

      /* failure, clean up */
      IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);

      /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
         automatically when the MPG stream is released.
         We only need to stop the VBI capturing. */
      if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
          test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
            ivtv_stop_v4l2_encode_stream(s_vbi, 0);
            clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
      }
      clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
      ivtv_release_stream(s);
      return -EIO;
}

ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
{
      struct ivtv_open_id *id = filp->private_data;
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];
      int rc;

      IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);

      mutex_lock(&itv->serialize_lock);
      rc = ivtv_start_capture(id);
      mutex_unlock(&itv->serialize_lock);
      if (rc)
            return rc;
      return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
}

int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
{
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];

      if (atomic_read(&itv->decoding) == 0) {
            if (ivtv_claim_stream(id, s->type)) {
                  /* someone else is using this stream already */
                  IVTV_DEBUG_WARN("start decode, stream already claimed\n");
                  return -EBUSY;
            }
            ivtv_start_v4l2_decode_stream(s, 0);
      }
      if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
            return ivtv_set_speed(itv, speed);
      return 0;
}

ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
{
      struct ivtv_open_id *id = filp->private_data;
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];
      struct ivtv_buffer *buf;
      struct ivtv_queue q;
      int bytes_written = 0;
      int mode;
      int rc;
      DEFINE_WAIT(wait);

      IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);

      if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
          s->type != IVTV_DEC_STREAM_TYPE_YUV &&
          s->type != IVTV_DEC_STREAM_TYPE_VOUT)
            /* not decoder streams */
            return -EPERM;

      /* Try to claim this stream */
      if (ivtv_claim_stream(id, s->type))
            return -EBUSY;

      /* This stream does not need to start any decoding */
      if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
            int elems = count / sizeof(struct v4l2_sliced_vbi_data);

            set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
            return elems * sizeof(struct v4l2_sliced_vbi_data);
      }

      mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;

      if (ivtv_set_output_mode(itv, mode) != mode) {
          ivtv_release_stream(s);
          return -EBUSY;
      }
      ivtv_queue_init(&q);
      set_bit(IVTV_F_S_APPL_IO, &s->s_flags);

retry:
      for (;;) {
            /* Gather buffers */
            while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
                  ivtv_enqueue(s, buf, &q);
            while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
                  ivtv_enqueue(s, buf, &q);
            }
            if (q.buffers)
                  break;
            if (filp->f_flags & O_NONBLOCK)
                  return -EAGAIN;
            prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
            /* New buffers might have become free before we were added to the waitqueue */
            if (!s->q_free.buffers)
                  schedule();
            finish_wait(&s->waitq, &wait);
            if (signal_pending(current)) {
                  IVTV_DEBUG_INFO("User stopped %s\n", s->name);
                  return -EINTR;
            }
      }

      /* copy user data into buffers */
      while ((buf = ivtv_dequeue(s, &q))) {
            /* Make sure we really got all the user data */
            rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);

            if (rc < 0) {
                  ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
                  return rc;
            }
            user_buf += rc;
            count -= rc;
            bytes_written += rc;

            if (buf->bytesused != s->buf_size) {
                  /* incomplete, leave in q_io for next time */
                  ivtv_enqueue(s, buf, &s->q_io);
                  break;
            }
            /* Byteswap MPEG buffer */
            if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
                  ivtv_buf_swap(buf);
            ivtv_enqueue(s, buf, &s->q_full);
      }

      /* Start decoder (returns 0 if already started) */
      mutex_lock(&itv->serialize_lock);
      rc = ivtv_start_decoding(id, itv->speed);
      mutex_unlock(&itv->serialize_lock);
      if (rc) {
            IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);

            /* failure, clean up */
            clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
            clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            return rc;
      }
      if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
            if (s->q_full.length >= itv->dma_data_req_size) {
                  int got_sig;

                  prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
                  while (!(got_sig = signal_pending(current)) &&
                              test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
                        schedule();
                  }
                  finish_wait(&itv->dma_waitq, &wait);
                  if (got_sig) {
                        IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
                        return -EINTR;
                  }

                  clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
                  ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
                  ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
            }
      }
      /* more user data is available, wait until buffers become free
         to transfer the rest. */
      if (count && !(filp->f_flags & O_NONBLOCK))
            goto retry;
      IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
      return bytes_written;
}

unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
{
      struct ivtv_open_id *id = filp->private_data;
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];
      int res = 0;

      /* add stream's waitq to the poll list */
      IVTV_DEBUG_HI_FILE("Decoder poll\n");
      poll_wait(filp, &s->waitq, wait);

      set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
      if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
          test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
            res = POLLPRI;

      /* Allow write if buffers are available for writing */
      if (s->q_free.buffers)
            res |= POLLOUT | POLLWRNORM;
      return res;
}

unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
{
      struct ivtv_open_id *id = filp->private_data;
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];
      int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);

      /* Start a capture if there is none */
      if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
            int rc;

            mutex_lock(&itv->serialize_lock);
            rc = ivtv_start_capture(id);
            mutex_unlock(&itv->serialize_lock);
            if (rc) {
                  IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
                              s->name, rc);
                  return POLLERR;
            }
            IVTV_DEBUG_FILE("Encoder poll started capture\n");
      }

      /* add stream's waitq to the poll list */
      IVTV_DEBUG_HI_FILE("Encoder poll\n");
      poll_wait(filp, &s->waitq, wait);

      if (eof || s->q_full.length)
            return POLLIN | POLLRDNORM;
      return 0;
}

void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
{
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];

      IVTV_DEBUG_FILE("close() of %s\n", s->name);

      /* 'Unclaim' this stream */

      /* Stop capturing */
      if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
            struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];

            IVTV_DEBUG_INFO("close stopping capture\n");
            /* Special case: a running VBI capture for VBI insertion
               in the mpeg stream. Need to stop that too. */
            if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
                test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
                !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
                  IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
                  ivtv_stop_v4l2_encode_stream(s_vbi, 0);
            }
            if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
                 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
                test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
                  /* Also used internally, don't stop capturing */
                  s->id = -1;
            }
            else {
                  ivtv_stop_v4l2_encode_stream(s, gop_end);
            }
      }
      if (!gop_end) {
            clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
            clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
            ivtv_release_stream(s);
      }
}

static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
{
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];

      IVTV_DEBUG_FILE("close() of %s\n", s->name);

      /* Stop decoding */
      if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
            IVTV_DEBUG_INFO("close stopping decode\n");

            ivtv_stop_v4l2_decode_stream(s, flags, pts);
            itv->output_mode = OUT_NONE;
      }
      clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
      clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
      if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
            /* Restore registers we've changed & clean up any mess we've made */
            ivtv_yuv_close(itv);
      }
      if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
            itv->output_mode = OUT_NONE;

      itv->speed = 0;
      clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
      ivtv_release_stream(s);
}

int ivtv_v4l2_close(struct inode *inode, struct file *filp)
{
      struct ivtv_open_id *id = filp->private_data;
      struct ivtv *itv = id->itv;
      struct ivtv_stream *s = &itv->streams[id->type];

      IVTV_DEBUG_FILE("close %s\n", s->name);

      v4l2_prio_close(&itv->prio, &id->prio);

      /* Easy case first: this stream was never claimed by us */
      if (s->id != id->open_id) {
            kfree(id);
            return 0;
      }

      /* 'Unclaim' this stream */

      /* Stop radio */
      mutex_lock(&itv->serialize_lock);
      if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
            /* Closing radio device, return to TV mode */
            ivtv_mute(itv);
            /* Mark that the radio is no longer in use */
            clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
            /* Switch tuner to TV */
            ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
            /* Select correct audio input (i.e. TV tuner or Line in) */
            ivtv_audio_set_io(itv);
            if (itv->hw_flags & IVTV_HW_SAA711X)
            {
                  struct v4l2_crystal_freq crystal_freq;
                  crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
                  crystal_freq.flags = 0;
                  ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
            }
            if (atomic_read(&itv->capturing) > 0) {
                  /* Undo video mute */
                  ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
                        itv->params.video_mute | (itv->params.video_mute_yuv << 8));
            }
            /* Done! Unmute and continue. */
            ivtv_unmute(itv);
            ivtv_release_stream(s);
      } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
            struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];

            ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);

            /* If all output streams are closed, and if the user doesn't have
               IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
            if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
                  /* disable CC on TV-out */
                  ivtv_disable_cc(itv);
            }
      } else {
            ivtv_stop_capture(id, 0);
      }
      kfree(id);
      mutex_unlock(&itv->serialize_lock);
      return 0;
}

static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
{
      struct ivtv *itv = s->itv;
      struct ivtv_open_id *item;

      IVTV_DEBUG_FILE("open %s\n", s->name);

      if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
            test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
            return -EBUSY;

      if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
            test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
            return -EBUSY;

      if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
            if (read_reg(0x82c) == 0) {
                  IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
                  /* return -ENODEV; */
            }
            ivtv_udma_alloc(itv);
      }

      /* Allocate memory */
      item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
      if (NULL == item) {
            IVTV_DEBUG_WARN("nomem on v4l2 open\n");
            return -ENOMEM;
      }
      item->itv = itv;
      item->type = s->type;
      v4l2_prio_open(&itv->prio, &item->prio);

      item->open_id = itv->open_id++;
      filp->private_data = item;

      if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
            /* Try to claim this stream */
            if (ivtv_claim_stream(item, item->type)) {
                  /* No, it's already in use */
                  kfree(item);
                  return -EBUSY;
            }

            if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
                  if (atomic_read(&itv->capturing) > 0) {
                        /* switching to radio while capture is
                           in progress is not polite */
                        ivtv_release_stream(s);
                        kfree(item);
                        return -EBUSY;
                  }
            }
            /* Mark that the radio is being used. */
            set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
            /* We have the radio */
            ivtv_mute(itv);
            /* Switch tuner to radio */
            ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
            /* Select the correct audio input (i.e. radio tuner) */
            ivtv_audio_set_io(itv);
            if (itv->hw_flags & IVTV_HW_SAA711X)
            {
                  struct v4l2_crystal_freq crystal_freq;
                  crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
                  crystal_freq.flags = SAA7115_FREQ_FL_APLL;
                  ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
            }
            /* Done! Unmute and continue. */
            ivtv_unmute(itv);
      }

      /* YUV or MPG Decoding Mode? */
      if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
            clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
      else if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
            set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
      return 0;
}

int ivtv_v4l2_open(struct inode *inode, struct file *filp)
{
      int res, x, y = 0;
      struct ivtv *itv = NULL;
      struct ivtv_stream *s = NULL;
      int minor = iminor(inode);

      /* Find which card this open was on */
      spin_lock(&ivtv_cards_lock);
      for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
            /* find out which stream this open was on */
            for (y = 0; y < IVTV_MAX_STREAMS; y++) {
                  s = &ivtv_cards[x]->streams[y];
                  if (s->v4l2dev && s->v4l2dev->minor == minor) {
                        itv = ivtv_cards[x];
                        break;
                  }
            }
      }
      spin_unlock(&ivtv_cards_lock);

      if (itv == NULL) {
            /* Couldn't find a device registered
               on that minor, shouldn't happen! */
            printk(KERN_WARNING "No ivtv device found on minor %d\n", minor);
            return -ENXIO;
      }

      mutex_lock(&itv->serialize_lock);
      if (ivtv_init_on_first_open(itv)) {
            IVTV_ERR("Failed to initialize on minor %d\n", minor);
            mutex_unlock(&itv->serialize_lock);
            return -ENXIO;
      }
      res = ivtv_serialized_open(s, filp);
      mutex_unlock(&itv->serialize_lock);
      return res;
}

void ivtv_mute(struct ivtv *itv)
{
      if (atomic_read(&itv->capturing))
            ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
      IVTV_DEBUG_INFO("Mute\n");
}

void ivtv_unmute(struct ivtv *itv)
{
      if (atomic_read(&itv->capturing)) {
            ivtv_msleep_timeout(100, 0);
            ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
            ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
      }
      IVTV_DEBUG_INFO("Unmute\n");
}

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