Commit c208a533 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: core: Add snd_device_get_state() helper 

A new small helper to get the current state of the device registration
for the given object.  It'll be used for USB-audio driver to check the
delayed device registrations.

Link: https://lore.kernel.org/r/20200323170643.19181-1-tiwai@suse.de


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 55f73261

include/sound/core.h

+1 −0
Original line number Diff line number Diff line
@@ -266,6 +266,7 @@ void snd_device_disconnect(struct snd_card *card, void *device_data); 
void snd_device_disconnect_all(struct snd_card *card);

void snd_device_free(struct snd_card *card, void *device_data);

void snd_device_free_all(struct snd_card *card);

int snd_device_get_state(struct snd_card *card, void *device_data);



/* isadma.c */

sound/core/device.c

+21 −0
Original line number Diff line number Diff line
@@ -237,3 +237,24 @@ void snd_device_free_all(struct snd_card *card) 
	list_for_each_entry_safe_reverse(dev, next, &card->devices, list)

		__snd_device_free(dev);

}



/**

 * snd_device_get_state - Get the current state of the given device

 * @card: the card instance

 * @device_data: the data pointer to release

 *

 * Returns the current state of the given device object.  For the valid

 * device, either @SNDRV_DEV_BUILD, @SNDRV_DEV_REGISTERED or

 * @SNDRV_DEV_DISCONNECTED is returned.

 * Or for a non-existing device, -1 is returned as an error.

 */

int snd_device_get_state(struct snd_card *card, void *device_data)

{

	struct snd_device *dev;



	dev = look_for_dev(card, device_data);

	if (dev)

		return dev->state;

	return -1;

}

EXPORT_SYMBOL_GPL(snd_device_get_state);