sound/core/device.c

/*
 *  Device management routines
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#define __NO_VERSION__
#include <sound/driver.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>

int snd_device_new(snd_card_t *card, snd_device_type_t type,
		   void *device_data, snd_device_ops_t *ops)
{
	snd_device_t *dev;

	snd_assert(card != NULL && device_data != NULL && ops != NULL, return -ENXIO);
	dev = (snd_device_t *) snd_magic_kcalloc(snd_device_t, 0, GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;
	dev->card = card;
	dev->type = type;
	dev->state = SNDRV_DEV_BUILD;
	dev->device_data = device_data;
	dev->ops = ops;
	list_add(&dev->list, &card->devices);	/* add to the head of list */
	return 0;
}

int snd_device_free(snd_card_t *card, void *device_data)
{
	struct list_head *list;
	snd_device_t *dev;
	
	snd_assert(card != NULL, return -ENXIO);
	snd_assert(device_data != NULL, return -ENXIO);
	list_for_each(list, &card->devices) {
		dev = snd_device(list);
		if (dev->device_data != device_data)
			continue;
		/* unlink */
		list_del(&dev->list);
		if (dev->state == SNDRV_DEV_REGISTERED && dev->ops->dev_unregister) {
			if (dev->ops->dev_unregister(dev))
				snd_printk(KERN_ERR "device unregister failure\n");
		} else {
			if (dev->ops->dev_free) {
				if (dev->ops->dev_free(dev))
					snd_printk(KERN_ERR "device free failure\n");
			}
		}
		snd_magic_kfree(dev);
		return 0;
	}
	snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0));
	return -ENXIO;
}

int snd_device_register(snd_card_t *card, void *device_data)
{
	struct list_head *list;
	snd_device_t *dev;
	int err;
	
	snd_assert(card != NULL && device_data != NULL, return -ENXIO);
	list_for_each(list, &card->devices) {
		dev = snd_device(list);
		if (dev->device_data != device_data)
			continue;
		if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
			if ((err = dev->ops->dev_register(dev)) < 0)
				return err;
			dev->state = SNDRV_DEV_REGISTERED;
			return 0;
		}
		return -EBUSY;
	}
	snd_BUG();
	return -ENXIO;
}

int snd_device_register_all(snd_card_t *card)
{
	struct list_head *list;
	snd_device_t *dev;
	int err;
	
	snd_assert(card != NULL, return -ENXIO);
	list_for_each(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)
				return err;
			dev->state = SNDRV_DEV_REGISTERED;
		}
	}
	return 0;
}

int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd)
{
	snd_device_t *dev;
	struct list_head *list;
	int err, range_low, range_high;

	snd_assert(card != NULL, return -ENXIO);
	range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
	range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
      __again:
	list_for_each(list, &card->devices) {
		dev = snd_device(list);		
		if (dev->type >= range_low && dev->type <= range_high) {
			if ((err = snd_device_free(card, dev->device_data)) < 0)
				return err;
			goto __again;
		}
	}
	return 0;
}