Commit 7f018db1 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: core: Introduce snd_device_alloc() 



Introduce a new helper, snd_device_alloc(), for allocating a struct
device that is bound with the sound class.  It's a replacement of
snd_device_initialize().

Reviewed-by: default avatarJaroslav Kysela <perex@perex.cz>
Signed-off-by: default avatarCurtis Malainey <cujomalainey@chromium.org>
Tested-by: default avatarCurtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20230816160252.23396-2-tiwai@suse.de


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 2e6f9790

include/sound/core.h

+1 −0
Original line number Diff line number Diff line
@@ -239,6 +239,7 @@ extern struct dentry *sound_debugfs_root; 


void snd_request_card(int card);



int snd_device_alloc(struct device **dev_p, struct snd_card *card);

void snd_device_initialize(struct device *dev, struct snd_card *card);



int snd_register_device(int type, struct snd_card *card, int dev,

sound/core/init.c

+31 −0
Original line number Diff line number Diff line
@@ -134,6 +134,37 @@ void snd_device_initialize(struct device *dev, struct snd_card *card) 
}

EXPORT_SYMBOL_GPL(snd_device_initialize);



/* the default release callback set in snd_device_alloc() */

static void default_release_alloc(struct device *dev)

{

	kfree(dev);

}



/**

 * snd_device_alloc - Allocate and initialize struct device for sound devices

 * @dev_p: pointer to store the allocated device

 * @card: card to assign, optional

 *

 * For releasing the allocated device, call put_device().

 */

int snd_device_alloc(struct device **dev_p, struct snd_card *card)

{

	struct device *dev;



	*dev_p = NULL;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (!dev)

		return -ENOMEM;

	device_initialize(dev);

	if (card)

		dev->parent = &card->card_dev;

	dev->class = &sound_class;

	dev->release = default_release_alloc;

	*dev_p = dev;

	return 0;

}

EXPORT_SYMBOL_GPL(snd_device_alloc);



static int snd_card_init(struct snd_card *card, struct device *parent,

			 int idx, const char *xid, struct module *module,

			 size_t extra_size);