ALSA: bebob: Add hwdep interface
This interface is designed for mixer/control application. By using hwdep
interface, the 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>
diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c
index 120a61b9..c04cea2 100644
--- a/sound/firewire/bebob/bebob_midi.c
+++ b/sound/firewire/bebob/bebob_midi.c
@@ -11,17 +11,35 @@
static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_lock_try(bebob);
+ if (err < 0)
+ goto end;
atomic_inc(&bebob->capture_substreams);
- return snd_bebob_stream_start_duplex(bebob, 0);
+ err = snd_bebob_stream_start_duplex(bebob, 0);
+ if (err < 0)
+ snd_bebob_stream_lock_release(bebob);
+end:
+ return err;
}
static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_lock_try(bebob);
+ if (err < 0)
+ goto end;
atomic_inc(&bebob->playback_substreams);
- return snd_bebob_stream_start_duplex(bebob, 0);
+ err = snd_bebob_stream_start_duplex(bebob, 0);
+ if (err < 0)
+ snd_bebob_stream_lock_release(bebob);
+end:
+ return err;
}
static int midi_capture_close(struct snd_rawmidi_substream *substream)
@@ -31,6 +49,7 @@
atomic_dec(&bebob->capture_substreams);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
@@ -41,6 +60,7 @@
atomic_dec(&bebob->playback_substreams);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}