int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
int rc;
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;
}
rc = ivtv_start_v4l2_decode_stream(s, 0);
if (rc < 0) {
if (rc == -EAGAIN)
rc = ivtv_start_v4l2_decode_stream(s, 0);
if (rc < 0)
return rc;
}
}
if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
return ivtv_set_speed(itv, speed);
return 0;
}
static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
{
struct ivtv_open_id *id = fh2id(filp->private_data);
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
struct yuv_playback_info *yi = &itv->yuv_info;
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 -EINVAL;
/* 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);
return ivtv_write_vbi_from_user(itv,
(const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
}
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);
/* Start decoder (returns 0 if already started) */
rc = ivtv_start_decoding(id, itv->speed);
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;
}
retry:
/* If possible, just DMA the entire frame - Check the data transfer size
since we may get here before the stream has been fully set-up */
if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
while (count >= itv->dma_data_req_size) {
rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
if (rc < 0)
return rc;
bytes_written += itv->dma_data_req_size;
user_buf += itv->dma_data_req_size;
count -= itv->dma_data_req_size;
}
if (count == 0) {
IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
return bytes_written;
}
}
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;
mutex_unlock(&itv->serialize_lock);
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);
mutex_lock(&itv->serialize_lock);
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))) {
/* yuv is a pain. Don't copy more data than needed for a single
frame, otherwise we lose sync with the incoming stream */
if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
yi->stream_size + count > itv->dma_data_req_size)
rc = ivtv_buf_copy_from_user(s, buf, user_buf,
itv->dma_data_req_size - yi->stream_size);
else
rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
/* Make sure we really got all the user data */
if (rc < 0) {
ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
return rc;
}
user_buf += rc;
count -= rc;
bytes_written += rc;
if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
yi->stream_size += rc;
/* If we have a complete yuv frame, break loop now */
if (yi->stream_size == itv->dma_data_req_size) {
ivtv_enqueue(s, buf, &s->q_full);
yi->stream_size = 0;
break;
}
}
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);
}
if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
if (s->q_full.length >= itv->dma_data_req_size) {
int got_sig;
if (mode == OUT_YUV)
ivtv_yuv_setup_stream_frame(itv);
mutex_unlock(&itv->serialize_lock);
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);
mutex_lock(&itv->serialize_lock);
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;
}
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);
/* For yuv, we need to know the dma size before we start */
itv->dma_data_req_size =
1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
itv->yuv_info.stream_size = 0;
}
return 0;
}
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 -EINVAL;
}
/* 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;
}
static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
{
#ifdef CONFIG_VIDEO_ADV_DEBUG
struct video_device *vdev = video_devdata(filp);
#endif
struct ivtv *itv = s->itv;
struct ivtv_open_id *item;
int res = 0;
IVTV_DEBUG_FILE("open %s\n", s->name);
#ifdef CONFIG_VIDEO_ADV_DEBUG
/* Unless ivtv_fw_debug is set, error out if firmware dead. */
if (ivtv_fw_debug) {
IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
video_device_node_name(vdev));
IVTV_WARN("Selected firmware errors will be ignored\n");
} else {
#else
if (1) {
#endif
res = ivtv_firmware_check(itv, "ivtv_serialized_open");
if (res == -EAGAIN)
res = ivtv_firmware_check(itv, "ivtv_serialized_open");
if (res < 0)
return -EIO;
}
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 = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
if (NULL == item) {
IVTV_DEBUG_WARN("nomem on v4l2 open\n");
return -ENOMEM;
}
v4l2_fh_init(&item->fh, s->vdev);
if (res < 0) {
v4l2_fh_exit(&item->fh);
kfree(item);
return res;
}
item->itv = itv;
item->type = s->type;
item->open_id = itv->open_id++;
filp->private_data = &item->fh;
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 */
v4l2_fh_exit(&item->fh);
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);
v4l2_fh_exit(&item->fh);
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_all(itv, tuner, s_radio);
/* Select the correct audio input (i.e. radio tuner) */
ivtv_audio_set_io(itv);
if (itv->hw_flags & IVTV_HW_SAA711X) {
ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
}
/* 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);
/* For yuv, we need to know the dma size before we start */
itv->dma_data_req_size =
1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
itv->yuv_info.stream_size = 0;
}
v4l2_fh_add(&item->fh);
return 0;
}
int ivtv_v4l2_open(struct file *filp)
{
int res;
struct ivtv *itv = NULL;
struct ivtv_stream *s = NULL;
struct video_device *vdev = video_devdata(filp);
s = video_get_drvdata(vdev);
itv = s->itv;
mutex_lock(&itv->serialize_lock);
if (ivtv_init_on_first_open(itv)) {
IVTV_ERR("Failed to initialize on device %s\n",
video_device_node_name(vdev));
mutex_unlock(&itv->serialize_lock);
return -ENXIO;
}
res = ivtv_serialized_open(s, filp);
mutex_unlock(&itv->serialize_lock);
return res;
}
