From 88a8516a2128a6d078a106ead48092240e8a138f Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Fri, 11 Mar 2011 14:51:12 +0100 Subject: ALSA: usbaudio: implement USB autosuspend Devices are autosuspended if no pcm nor midi channel is open Mixer devices may be opened. This way they are active when in use to play or record sound, but can be suspended while users have a mixer application running. [Small clean-ups using static inline by tiwai] Signed-off-by: Oliver Neukum Signed-off-by: Takashi Iwai --- sound/usb/midi.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'sound/usb/midi.c') diff --git a/sound/usb/midi.c b/sound/usb/midi.c index db2dc5ffe6dd..b4b39c0b6c9e 100644 --- a/sound/usb/midi.c +++ b/sound/usb/midi.c @@ -54,6 +54,7 @@ #include #include "usbaudio.h" #include "midi.h" +#include "power.h" #include "helper.h" /* @@ -1044,6 +1045,7 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream) struct snd_usb_midi* umidi = substream->rmidi->private_data; struct usbmidi_out_port* port = NULL; int i, j; + int err; for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) if (umidi->endpoints[i].out) @@ -1056,6 +1058,9 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream) snd_BUG(); return -ENXIO; } + err = usb_autopm_get_interface(umidi->iface); + if (err < 0) + return -EIO; substream->runtime->private_data = port; port->state = STATE_UNKNOWN; substream_open(substream, 1); @@ -1064,7 +1069,10 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream) static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream) { + struct snd_usb_midi* umidi = substream->rmidi->private_data; + substream_open(substream, 0); + usb_autopm_put_interface(umidi->iface); return 0; } -- cgit v1.2.3