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[media] sound/usb: Use Media Controller API to share media resources

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Change ALSA driver to use Media Controller API to share media resources
with DVB and V4L2 drivers on a AU0828 media device. Media Controller
specific initialization is done after sound card is registered. ALSA
creates Media interface and entity function graph nodes for Control,
Mixer, PCM Playback, and PCM Capture devices.

snd_usb_hw_params() will call Media Controller enable source handler
interface to request the media resource. If resource request is
granted, it will release it from snd_usb_hw_free(). If resource is
busy, -EBUSY is returned.

Media specific cleanup is done in usb_audio_disconnect().

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Shuah Khan
2016-03-02 13:50:31 -03:00
committed by Mauro Carvalho Chehab
parent 6ede20f968
commit aebb2b89bf
11 changed files with 448 additions and 5 deletions
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14
sound/usb/card.c
View File

@ -66,6 +66,7 @@
#include "format.h"
#include "power.h"
#include "stream.h"
#include "media.h"
MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("USB Audio");
@ -561,6 +562,11 @@ static int usb_audio_probe(struct usb_interface *intf,
if (err < 0)
goto __error;
if (quirk->media_device) {
/* don't want to fail when media_snd_device_create() fails */
media_snd_device_create(chip, intf);
}
usb_chip[chip->index] = chip;
chip->num_interfaces++;
usb_set_intfdata(intf, chip);
@ -617,6 +623,14 @@ static void usb_audio_disconnect(struct usb_interface *intf)
list_for_each(p, &chip->midi_list) {
snd_usbmidi_disconnect(p);
}
/*
* Nice to check quirk && quirk->media_device
* need some special handlings. Doesn't look like
* we have access to quirk here
* Acceses mixer_list
*/
media_snd_device_delete(chip);
/* release mixer resources */
list_for_each_entry(mixer, &chip->mixer_list, list) {
snd_usb_mixer_disconnect(mixer);