/*
 *  Device management routines
 *  Copyright (c) by Jaroslav Kysela <perex@perex.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
 *
 */

#include <linux/slab.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <sound/core.h>

/**
 * snd_device_new - create an ALSA device component
 * @card: the card instance
 * @type: the device type, SNDRV_DEV_XXX
 * @device_data: the data pointer of this device
 * @ops: the operator table
 *
 * Creates a new device component for the given data pointer.
 * The device will be assigned to the card and managed together
 * by the card.
 *
 * The data pointer plays a role as the identifier, too, so the
 * pointer address must be unique and unchanged.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_device_new(struct snd_card *card, snd_device_type_t type,
                   void *device_data, struct snd_device_ops *ops)
{
        struct snd_device *dev;

        snd_assert(card != NULL, return -ENXIO);
        snd_assert(device_data != NULL, return -ENXIO);
        snd_assert(ops != NULL, return -ENXIO);
        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
        if (dev == NULL) {
                snd_printk(KERN_ERR "Cannot allocate device\n");
                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;
}

EXPORT_SYMBOL(snd_device_new);

/**
 * snd_device_free - release the device from the card
 * @card: the card instance
 * @device_data: the data pointer to release
 *
 * Removes the device from the list on the card and invokes the
 * callbacks, dev_disconnect and dev_free, corresponding to the state.
 * Then release the device.
 *
 * Returns zero if successful, or a negative error code on failure or if the
 * device not found.
 */
int snd_device_free(struct snd_card *card, void *device_data)
{
        struct snd_device *dev;
        
        snd_assert(card != NULL, return -ENXIO);
        snd_assert(device_data != NULL, return -ENXIO);
        list_for_each_entry(dev, &card->devices, list) {
                if (dev->device_data != device_data)
                        continue;
                /* unlink */
                list_del(&dev->list);
                if (dev->state == SNDRV_DEV_REGISTERED &&
                    dev->ops->dev_disconnect)
                        if (dev->ops->dev_disconnect(dev))
                                snd_printk(KERN_ERR
                                           "device disconnect failure\n");
                if (dev->ops->dev_free) {
                        if (dev->ops->dev_free(dev))
                                snd_printk(KERN_ERR "device free failure\n");
                }
                kfree(dev);
                return 0;
        }
        snd_printd("device free %p (from %p), not found\n", device_data,
                   __builtin_return_address(0));
        return -ENXIO;
}

EXPORT_SYMBOL(snd_device_free);

/**
 * snd_device_disconnect - disconnect the device
 * @card: the card instance
 * @device_data: the data pointer to disconnect
 *
 * Turns the device into the disconnection state, invoking
 * dev_disconnect callback, if the device was already registered.
 *
 * Usually called from snd_card_disconnect().
 *
 * Returns zero if successful, or a negative error code on failure or if the
 * device not found.
 */
int snd_device_disconnect(struct snd_card *card, void *device_data)
{
        struct snd_device *dev;

        snd_assert(card != NULL, return -ENXIO);
        snd_assert(device_data != NULL, return -ENXIO);
        list_for_each_entry(dev, &card->devices, list) {
                if (dev->device_data != device_data)
                        continue;
                if (dev->state == SNDRV_DEV_REGISTERED &&
                    dev->ops->dev_disconnect) {
                        if (dev->ops->dev_disconnect(dev))
                                snd_printk(KERN_ERR "device disconnect failure\n");
                        dev->state = SNDRV_DEV_DISCONNECTED;
                }
                return 0;
        }
        snd_printd("device disconnect %p (from %p), not found\n", device_data,
                   __builtin_return_address(0));
        return -ENXIO;
}

/**
 * snd_device_register - register the device
 * @card: the card instance
 * @device_data: the data pointer to register
 *
 * Registers the device which was already created via
 * snd_device_new().  Usually this is called from snd_card_register(),
 * but it can be called later if any new devices are created after
 * invocation of snd_card_register().
 *
 * Returns zero if successful, or a negative error code on failure or if the
 * device not found.
 */
int snd_device_register(struct snd_card *card, void *device_data)
{
        struct snd_device *dev;
        int err;

        snd_assert(card != NULL, return -ENXIO);
        snd_assert(device_data != NULL, return -ENXIO);
        list_for_each_entry(dev, &card->devices, 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;
                }
                snd_printd("snd_device_register busy\n");
                return -EBUSY;
        }
        snd_BUG();
        return -ENXIO;
}

EXPORT_SYMBOL(snd_device_register);

/*
 * register all the devices on the card.
 * called from init.c
 */
int snd_device_register_all(struct snd_card *card)
{
        struct snd_device *dev;
        int err;
        
        snd_assert(card != NULL, return -ENXIO);
        list_for_each_entry(dev, &card->devices, 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;
}

/*
 * disconnect all the devices on the card.
 * called from init.c
 */
int snd_device_disconnect_all(struct snd_card *card)
{
        struct snd_device *dev;
        int err = 0;

        snd_assert(card != NULL, return -ENXIO);
        list_for_each_entry(dev, &card->devices, list) {
                if (snd_device_disconnect(card, dev->device_data) < 0)
                        err = -ENXIO;
        }
        return err;
}

/*
 * release all the devices on the card.
 * called from init.c
 */
int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
{
        struct snd_device *dev;
        int err;
        unsigned int 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_entry(dev, &card->devices, 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;
}