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Commit 416c1079 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
Browse files

[ALSA] Nest sound devices 



Modules: ALSA Core

Make the control device parent of all other ALSA devices of a card.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
parent 156b2aa3

include/sound/core.h

+1 −0
Original line number Diff line number Diff line
@@ -134,6 +134,7 @@ struct snd_card { 
	wait_queue_head_t shutdown_sleep;

	struct work_struct free_workq;	/* for free in workqueue */

	struct device *dev;

	struct class_device *parent_device;



#ifdef CONFIG_PM

	unsigned int power_state;	/* power state */

sound/core/device.c

+1 −1
Original line number Diff line number Diff line
@@ -193,7 +193,7 @@ int snd_device_register_all(struct snd_card *card) 
	int err;

	

	snd_assert(card != NULL, return -ENXIO);

	list_for_each(list, &card->devices) {

	list_for_each_prev(list, &card->devices) {

		dev = snd_device(list);

		if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {

			if ((err = dev->ops->dev_register(dev)) < 0)

sound/core/sound.c

+9 −2
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ int snd_register_device(int type, struct snd_card *card, int dev, 
	int minor;

	struct snd_minor *preg;

	struct device *device = NULL;

	struct class_device *class_device = NULL;



	snd_assert(name, return -EINVAL);

	preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
@@ -272,9 +273,15 @@ int snd_register_device(int type, struct snd_card *card, int dev, 
	snd_minors[minor] = preg;

	if (type != SNDRV_DEVICE_TYPE_CONTROL || preg->card >= cards_limit)

		devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);

	if (card)

	if (card) {

		device = card->dev;

	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);

		class_device = card->parent_device;

	}

	class_device = class_device_create(sound_class, class_device,

					   MKDEV(major, minor), device,

					   "%s", name);

	if (type == SNDRV_DEVICE_TYPE_CONTROL)

		card->parent_device = class_device;



	up(&sound_mutex);

	return 0;