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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2013-04-18 11:02:08 +0100
committerTakashi Iwai <tiwai@suse.de>2013-04-21 09:53:18 +0200
commit49bb6402f1aa1effa9d9c5df39d91a86ca8fd736 (patch)
tree8d61083d6ec99266b14e409e077f40a040b96316 /sound/core
parent4daf891cdea2eb63b51cb35a3ac12706f8c50156 (diff)
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.c43
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;
}