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ALSA: core: Introduce snd_device_alloc()

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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: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20230816160252.23396-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-08-16 18:02:44 +02:00
parent 2e6f979037
commit 7f018db19b
2 changed files with 32 additions and 0 deletions
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1
include/sound/core.h
View file

@ -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,

31
sound/core/init.c
View file

@ -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);