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author | Charles Keepax <ckeepax@opensource.wolfsonmicro.com> | 2013-04-18 14:02:08 +0400 |
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committer | Takashi Iwai <tiwai@suse.de> | 2013-04-21 11:53:18 +0400 |
commit | 49bb6402f1aa1effa9d9c5df39d91a86ca8fd736 (patch) | |
tree | 8d61083d6ec99266b14e409e077f40a040b96316 /sound/core | |
parent | 4daf891cdea2eb63b51cb35a3ac12706f8c50156 (diff) | |
download | linux-49bb6402f1aa1effa9d9c5df39d91a86ca8fd736.tar.xz |
ALSA: compress_core: Add support for capture streams
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r-- | sound/core/compress_offload.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index 52ca4cce1462..52a276510b18 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -296,7 +296,41 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf, static ssize_t snd_compr_read(struct file *f, char __user *buf, size_t count, loff_t *offset) { - return -ENXIO; + struct snd_compr_file *data = f->private_data; + struct snd_compr_stream *stream; + size_t avail; + int retval; + + if (snd_BUG_ON(!data)) + return -EFAULT; + + stream = &data->stream; + mutex_lock(&stream->device->lock); + + /* read is allowed when stream is running */ + if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) { + retval = -EBADFD; + goto out; + } + + avail = snd_compr_get_avail(stream); + pr_debug("avail returned %ld\n", (unsigned long)avail); + /* calculate how much we can read from buffer */ + if (avail > count) + avail = count; + + if (stream->ops->copy) { + retval = stream->ops->copy(stream, buf, avail); + } else { + retval = -ENXIO; + goto out; + } + if (retval > 0) + stream->runtime->total_bytes_transferred += retval; + +out: + mutex_unlock(&stream->device->lock); + return retval; } static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) @@ -481,9 +515,14 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) retval = stream->ops->set_params(stream, params); if (retval) goto out; - stream->runtime->state = SNDRV_PCM_STATE_SETUP; + stream->metadata_set = false; stream->next_track = false; + + if (stream->direction == SND_COMPRESS_PLAYBACK) + stream->runtime->state = SNDRV_PCM_STATE_SETUP; + else + stream->runtime->state = SNDRV_PCM_STATE_PREPARED; } else { return -EPERM; } |