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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-03-22 15:30:24 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-03-28 13:34:02 +0300 |
| commit | 71c3797779d3cd8378767f5b2d8cfd3b2f88c5c1 (patch) | |
| tree | b64eeb67394492017bb55b3123ad11a13e7de202 /sound/firewire/motu/motu-midi.c | |
| parent | 9e796e7d59e71f8a556cfbdc2ffa3aff0555dd0e (diff) | |
| download | linux-71c3797779d3cd8378767f5b2d8cfd3b2f88c5c1.tar.xz | |
ALSA: firewire-motu: add hwdep interface
This commit adds hwdep interface so as the other sound drivers for units
on IEEE 1394 bus have.
This interface is designed for mixer/control applications. By using this
interface, an application can get information about firewire node, can
lock/unlock kernel streaming and can get notification at starting/stopping
kernel streaming.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/motu/motu-midi.c')
| -rw-r--r-- | sound/firewire/motu/motu-midi.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-midi.c b/sound/firewire/motu/motu-midi.c index f232f29589d0..e3acfcc53f4e 100644 --- a/sound/firewire/motu/motu-midi.c +++ b/sound/firewire/motu/motu-midi.c @@ -12,6 +12,10 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream) struct snd_motu *motu = substream->rmidi->private_data; int err; + err = snd_motu_stream_lock_try(motu); + if (err < 0) + return err; + mutex_lock(&motu->mutex); motu->capture_substreams++; @@ -19,6 +23,9 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream) mutex_unlock(&motu->mutex); + if (err < 0) + snd_motu_stream_lock_release(motu); + return err; } @@ -27,6 +34,10 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream) struct snd_motu *motu = substream->rmidi->private_data; int err; + err = snd_motu_stream_lock_try(motu); + if (err < 0) + return err; + mutex_lock(&motu->mutex); motu->playback_substreams++; @@ -34,6 +45,9 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream) mutex_unlock(&motu->mutex); + if (err < 0) + snd_motu_stream_lock_release(motu); + return err; } @@ -48,6 +62,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream) mutex_unlock(&motu->mutex); + snd_motu_stream_lock_release(motu); return 0; } @@ -62,6 +77,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream) mutex_unlock(&motu->mutex); + snd_motu_stream_lock_release(motu); return 0; } |