From ae369e559f16c5245d6b987c43799179af16e4d6 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Fri, 14 Apr 2017 16:46:32 +0900 Subject: ALSA: firewire-tascam: support drain callback for MIDI playback substream ALSA driver for TASCAM FireWire series transfers MIDI messages in system workqueue. In current design of the driver, applications should wait for sequence of transmission when they close ALSA rawmidi character devices. However, when considering design of rawmidi interface, it's preferable to wait in drain ioctl. This commit adds support for the drain ioctl to wait for the end of the transmission. Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/tascam/tascam-midi.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'sound/firewire') diff --git a/sound/firewire/tascam/tascam-midi.c b/sound/firewire/tascam/tascam-midi.c index 760f72a86c27..4a741570d536 100644 --- a/sound/firewire/tascam/tascam-midi.c +++ b/sound/firewire/tascam/tascam-midi.c @@ -30,12 +30,15 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream) } static int midi_playback_close(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static void midi_playback_drain(struct snd_rawmidi_substream *substream) { struct snd_tscm *tscm = substream->rmidi->private_data; snd_fw_async_midi_port_finish(&tscm->out_ports[substream->number]); - - return 0; } static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) @@ -77,6 +80,7 @@ int snd_tscm_create_midi_devices(struct snd_tscm *tscm) static const struct snd_rawmidi_ops playback_ops = { .open = midi_playback_open, .close = midi_playback_close, + .drain = midi_playback_drain, .trigger = midi_playback_trigger, }; struct snd_rawmidi *rmidi; -- cgit