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ALSA: oxfw: Add hwdep interface

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This interface is designed for mixer/control application. 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>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
2014-12-09 00:10:49 +09:00
committed by Takashi Iwai
parent 05588d340a
commit 8985f4ac1c
10 changed files with 280 additions and 4 deletions
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16
sound/firewire/oxfw/oxfw-midi.c
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@@ -13,6 +13,10 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
struct snd_oxfw *oxfw = substream->rmidi->private_data;
int err;
err = snd_oxfw_stream_lock_try(oxfw);
if (err < 0)
return err;
mutex_lock(&oxfw->mutex);
oxfw->capture_substreams++;
@@ -20,6 +24,9 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
mutex_unlock(&oxfw->mutex);
if (err < 0)
snd_oxfw_stream_lock_release(oxfw);
return err;
}
@@ -28,6 +35,10 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
struct snd_oxfw *oxfw = substream->rmidi->private_data;
int err;
err = snd_oxfw_stream_lock_try(oxfw);
if (err < 0)
return err;
mutex_lock(&oxfw->mutex);
oxfw->playback_substreams++;
@@ -35,6 +46,9 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
mutex_unlock(&oxfw->mutex);
if (err < 0)
snd_oxfw_stream_lock_release(oxfw);
return err;
}
@@ -49,6 +63,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
mutex_unlock(&oxfw->mutex);
snd_oxfw_stream_lock_release(oxfw);
return 0;
}
@@ -63,6 +78,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
mutex_unlock(&oxfw->mutex);
snd_oxfw_stream_lock_release(oxfw);
return 0;
}