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ALSA: Add a helper to initialize device

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Introduce a new helper function snd_device_initialize() to initialize
the device object for sound devices.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-29 21:32:47 +01:00
parent 23c18d4bfd
commit 4b440be667
2 changed files with 25 additions and 0 deletions
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2
include/sound/core.h
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@ -207,6 +207,8 @@ extern struct class *sound_class;
void snd_request_card(int card);
void snd_device_initialize(struct device *dev, struct snd_card *card);
int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
const struct file_operations *f_ops,
void *private_data, struct device *device,

23
sound/core/init.c
View File

@ -157,6 +157,29 @@ static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
return mask; /* unchanged */
}
/* the default release callback set in snd_device_initialize() below;
* this is just NOP for now, as almost all jobs are already done in
* dev_free callback of snd_device chain instead.
*/
static void default_release(struct device *dev)
{
}
/**
* snd_device_initialize - Initialize struct device for sound devices
* @dev: device to initialize
* @card: card to assign, optional
*/
void snd_device_initialize(struct device *dev, struct snd_card *card)
{
device_initialize(dev);
if (card)
dev->parent = &card->card_dev;
dev->class = sound_class;
dev->release = default_release;
}
EXPORT_SYMBOL_GPL(snd_device_initialize);
static int snd_card_do_free(struct snd_card *card);
static const struct attribute_group *card_dev_attr_groups[];