243 строки
6.7 KiB
C
243 строки
6.7 KiB
C
/*
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* Device management routines
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/errno.h>
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#include <sound/core.h>
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/**
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* snd_device_new - create an ALSA device component
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* @card: the card instance
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* @type: the device type, SNDRV_DEV_XXX
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* @device_data: the data pointer of this device
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* @ops: the operator table
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*
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* Creates a new device component for the given data pointer.
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* The device will be assigned to the card and managed together
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* by the card.
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*
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* The data pointer plays a role as the identifier, too, so the
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* pointer address must be unique and unchanged.
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_device_new(struct snd_card *card, snd_device_type_t type,
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void *device_data, struct snd_device_ops *ops)
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{
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struct snd_device *dev;
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snd_assert(card != NULL, return -ENXIO);
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snd_assert(device_data != NULL, return -ENXIO);
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snd_assert(ops != NULL, return -ENXIO);
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (dev == NULL) {
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snd_printk(KERN_ERR "Cannot allocate device\n");
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return -ENOMEM;
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}
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dev->card = card;
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dev->type = type;
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dev->state = SNDRV_DEV_BUILD;
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dev->device_data = device_data;
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dev->ops = ops;
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list_add(&dev->list, &card->devices); /* add to the head of list */
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return 0;
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}
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EXPORT_SYMBOL(snd_device_new);
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/**
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* snd_device_free - release the device from the card
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* @card: the card instance
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* @device_data: the data pointer to release
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*
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* Removes the device from the list on the card and invokes the
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* callbacks, dev_disconnect and dev_free, corresponding to the state.
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* Then release the device.
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*
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* Returns zero if successful, or a negative error code on failure or if the
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* device not found.
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*/
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int snd_device_free(struct snd_card *card, void *device_data)
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{
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struct snd_device *dev;
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snd_assert(card != NULL, return -ENXIO);
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snd_assert(device_data != NULL, return -ENXIO);
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list_for_each_entry(dev, &card->devices, list) {
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if (dev->device_data != device_data)
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continue;
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/* unlink */
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list_del(&dev->list);
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if (dev->state == SNDRV_DEV_REGISTERED &&
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dev->ops->dev_disconnect)
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if (dev->ops->dev_disconnect(dev))
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snd_printk(KERN_ERR
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"device disconnect failure\n");
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if (dev->ops->dev_free) {
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if (dev->ops->dev_free(dev))
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snd_printk(KERN_ERR "device free failure\n");
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}
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kfree(dev);
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return 0;
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}
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snd_printd("device free %p (from %p), not found\n", device_data,
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__builtin_return_address(0));
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return -ENXIO;
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}
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EXPORT_SYMBOL(snd_device_free);
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/**
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* snd_device_disconnect - disconnect the device
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* @card: the card instance
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* @device_data: the data pointer to disconnect
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*
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* Turns the device into the disconnection state, invoking
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* dev_disconnect callback, if the device was already registered.
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*
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* Usually called from snd_card_disconnect().
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*
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* Returns zero if successful, or a negative error code on failure or if the
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* device not found.
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*/
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int snd_device_disconnect(struct snd_card *card, void *device_data)
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{
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struct snd_device *dev;
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snd_assert(card != NULL, return -ENXIO);
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snd_assert(device_data != NULL, return -ENXIO);
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list_for_each_entry(dev, &card->devices, list) {
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if (dev->device_data != device_data)
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continue;
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if (dev->state == SNDRV_DEV_REGISTERED &&
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dev->ops->dev_disconnect) {
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if (dev->ops->dev_disconnect(dev))
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snd_printk(KERN_ERR "device disconnect failure\n");
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dev->state = SNDRV_DEV_DISCONNECTED;
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}
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return 0;
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}
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snd_printd("device disconnect %p (from %p), not found\n", device_data,
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__builtin_return_address(0));
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return -ENXIO;
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}
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/**
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* snd_device_register - register the device
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* @card: the card instance
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* @device_data: the data pointer to register
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*
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* Registers the device which was already created via
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* snd_device_new(). Usually this is called from snd_card_register(),
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* but it can be called later if any new devices are created after
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* invocation of snd_card_register().
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*
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* Returns zero if successful, or a negative error code on failure or if the
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* device not found.
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*/
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int snd_device_register(struct snd_card *card, void *device_data)
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{
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struct snd_device *dev;
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int err;
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snd_assert(card != NULL, return -ENXIO);
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snd_assert(device_data != NULL, return -ENXIO);
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list_for_each_entry(dev, &card->devices, list) {
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if (dev->device_data != device_data)
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continue;
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if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
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if ((err = dev->ops->dev_register(dev)) < 0)
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return err;
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dev->state = SNDRV_DEV_REGISTERED;
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return 0;
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}
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snd_printd("snd_device_register busy\n");
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return -EBUSY;
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}
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snd_BUG();
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return -ENXIO;
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}
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EXPORT_SYMBOL(snd_device_register);
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/*
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* register all the devices on the card.
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* called from init.c
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*/
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int snd_device_register_all(struct snd_card *card)
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{
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struct snd_device *dev;
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int err;
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snd_assert(card != NULL, return -ENXIO);
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list_for_each_entry(dev, &card->devices, list) {
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if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
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if ((err = dev->ops->dev_register(dev)) < 0)
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return err;
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dev->state = SNDRV_DEV_REGISTERED;
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}
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}
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return 0;
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}
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/*
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* disconnect all the devices on the card.
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* called from init.c
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*/
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int snd_device_disconnect_all(struct snd_card *card)
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{
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struct snd_device *dev;
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int err = 0;
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snd_assert(card != NULL, return -ENXIO);
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list_for_each_entry(dev, &card->devices, list) {
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if (snd_device_disconnect(card, dev->device_data) < 0)
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err = -ENXIO;
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}
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return err;
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}
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/*
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* release all the devices on the card.
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* called from init.c
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*/
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int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
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{
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struct snd_device *dev;
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int err;
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unsigned int range_low, range_high;
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snd_assert(card != NULL, return -ENXIO);
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range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
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range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
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__again:
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list_for_each_entry(dev, &card->devices, list) {
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if (dev->type >= range_low && dev->type <= range_high) {
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if ((err = snd_device_free(card, dev->device_data)) < 0)
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return err;
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goto __again;
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}
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}
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return 0;
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}
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