246 lines
6.3 KiB
C
246 lines
6.3 KiB
C
/*
|
|
* 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/export.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.
|
|
*
|
|
* Return: Zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_device_new(struct snd_card *card, enum snd_device_type type,
|
|
void *device_data, struct snd_device_ops *ops)
|
|
{
|
|
struct snd_device *dev;
|
|
struct list_head *p;
|
|
|
|
if (snd_BUG_ON(!card || !device_data || !ops))
|
|
return -ENXIO;
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&dev->list);
|
|
dev->card = card;
|
|
dev->type = type;
|
|
dev->state = SNDRV_DEV_BUILD;
|
|
dev->device_data = device_data;
|
|
dev->ops = ops;
|
|
|
|
/* insert the entry in an incrementally sorted list */
|
|
list_for_each_prev(p, &card->devices) {
|
|
struct snd_device *pdev = list_entry(p, struct snd_device, list);
|
|
if ((unsigned int)pdev->type <= (unsigned int)type)
|
|
break;
|
|
}
|
|
|
|
list_add(&dev->list, p);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_device_new);
|
|
|
|
static void __snd_device_disconnect(struct snd_device *dev)
|
|
{
|
|
if (dev->state == SNDRV_DEV_REGISTERED) {
|
|
if (dev->ops->dev_disconnect &&
|
|
dev->ops->dev_disconnect(dev))
|
|
dev_err(dev->card->dev, "device disconnect failure\n");
|
|
dev->state = SNDRV_DEV_DISCONNECTED;
|
|
}
|
|
}
|
|
|
|
static void __snd_device_free(struct snd_device *dev)
|
|
{
|
|
/* unlink */
|
|
list_del(&dev->list);
|
|
|
|
__snd_device_disconnect(dev);
|
|
if (dev->ops->dev_free) {
|
|
if (dev->ops->dev_free(dev))
|
|
dev_err(dev->card->dev, "device free failure\n");
|
|
}
|
|
kfree(dev);
|
|
}
|
|
|
|
static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
|
|
{
|
|
struct snd_device *dev;
|
|
|
|
list_for_each_entry(dev, &card->devices, list)
|
|
if (dev->device_data == device_data)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* 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().
|
|
*
|
|
* Return: Zero if successful, or a negative error code on failure or if the
|
|
* device not found.
|
|
*/
|
|
void snd_device_disconnect(struct snd_card *card, void *device_data)
|
|
{
|
|
struct snd_device *dev;
|
|
|
|
if (snd_BUG_ON(!card || !device_data))
|
|
return;
|
|
dev = look_for_dev(card, device_data);
|
|
if (dev)
|
|
__snd_device_disconnect(dev);
|
|
else
|
|
dev_dbg(card->dev, "device disconnect %p (from %pS), not found\n",
|
|
device_data, __builtin_return_address(0));
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_device_disconnect);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
void snd_device_free(struct snd_card *card, void *device_data)
|
|
{
|
|
struct snd_device *dev;
|
|
|
|
if (snd_BUG_ON(!card || !device_data))
|
|
return;
|
|
dev = look_for_dev(card, device_data);
|
|
if (dev)
|
|
__snd_device_free(dev);
|
|
else
|
|
dev_dbg(card->dev, "device free %p (from %pS), not found\n",
|
|
device_data, __builtin_return_address(0));
|
|
}
|
|
EXPORT_SYMBOL(snd_device_free);
|
|
|
|
static int __snd_device_register(struct snd_device *dev)
|
|
{
|
|
if (dev->state == SNDRV_DEV_BUILD) {
|
|
if (dev->ops->dev_register) {
|
|
int err = dev->ops->dev_register(dev);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
dev->state = SNDRV_DEV_REGISTERED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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().
|
|
*
|
|
* Return: 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;
|
|
|
|
if (snd_BUG_ON(!card || !device_data))
|
|
return -ENXIO;
|
|
dev = look_for_dev(card, device_data);
|
|
if (dev)
|
|
return __snd_device_register(dev);
|
|
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;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return -ENXIO;
|
|
list_for_each_entry(dev, &card->devices, list) {
|
|
err = __snd_device_register(dev);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* disconnect all the devices on the card.
|
|
* called from init.c
|
|
*/
|
|
void snd_device_disconnect_all(struct snd_card *card)
|
|
{
|
|
struct snd_device *dev;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return;
|
|
list_for_each_entry_reverse(dev, &card->devices, list)
|
|
__snd_device_disconnect(dev);
|
|
}
|
|
|
|
/*
|
|
* release all the devices on the card.
|
|
* called from init.c
|
|
*/
|
|
void snd_device_free_all(struct snd_card *card)
|
|
{
|
|
struct snd_device *dev, *next;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return;
|
|
list_for_each_entry_safe_reverse(dev, next, &card->devices, list)
|
|
__snd_device_free(dev);
|
|
}
|