diff options
Diffstat (limited to 'sound/firewire/amdtp-am824.c')
| -rw-r--r-- | sound/firewire/amdtp-am824.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/firewire/amdtp-am824.c b/sound/firewire/amdtp-am824.c index 5d99a9921d50..540a101661e2 100644 --- a/sound/firewire/amdtp-am824.c +++ b/sound/firewire/amdtp-am824.c @@ -101,6 +101,24 @@ int amdtp_am824_add_pcm_hw_constraints(struct amdtp_stream *s, EXPORT_SYMBOL_GPL(amdtp_am824_add_pcm_hw_constraints); /** + * amdtp_am824_midi_trigger - start/stop playback/capture with a MIDI device + * @s: the AMDTP stream + * @port: index of MIDI port + * @midi: the MIDI device to be started, or %NULL to stop the current device + * + * Call this function on a running isochronous stream to enable the actual + * transmission of MIDI data. This function should be called from the MIDI + * device's .trigger callback. + */ +void amdtp_am824_midi_trigger(struct amdtp_stream *s, unsigned int port, + struct snd_rawmidi_substream *midi) +{ + if (port < s->midi_ports) + ACCESS_ONCE(s->midi[port]) = midi; +} +EXPORT_SYMBOL_GPL(amdtp_am824_midi_trigger); + +/** * amdtp_am824_init - initialize an AMDTP stream structure to handle AM824 * data block * @s: the AMDTP stream to initialize |