satip-axe/kernel/sound/stm/conv_dummy.c
2015-03-26 17:24:57 +01:00

171 lines
4.1 KiB
C

/*
* STMicroelectronics System-on-Chips' dummy DAC driver
*
* Copyright (c) 2005-2011 STMicroelectronics Limited
*
* Author: Pawel Moll <pawel.moll@st.com>
*
* 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/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <sound/stm.h>
#include "common.h"
static int snd_stm_debug_level;
module_param_named(debug, snd_stm_debug_level, int, S_IRUGO | S_IWUSR);
/*
* Dummy converter instance structure
*/
struct snd_stm_conv_dummy {
struct snd_stm_conv_converter *converter;
struct snd_stm_conv_dummy_info *info;
snd_stm_magic_field;
};
/*
* Converter interface implementation
*/
static unsigned int snd_stm_conv_dummy_get_format(void *priv)
{
struct snd_stm_conv_dummy *conv_dummy = priv;
snd_stm_printd(1, "snd_stm_conv_dummy_get_format(priv=%p)\n", priv);
BUG_ON(!conv_dummy);
BUG_ON(!snd_stm_magic_valid(conv_dummy));
return conv_dummy->info->format;
}
static int snd_stm_conv_dummy_get_oversampling(void *priv)
{
struct snd_stm_conv_dummy *conv_dummy = priv;
snd_stm_printd(1, "snd_stm_conv_dummy_get_oversampling(priv=%p)\n",
priv);
BUG_ON(!conv_dummy);
BUG_ON(!snd_stm_magic_valid(conv_dummy));
return conv_dummy->info->oversampling;
}
static struct snd_stm_conv_ops snd_stm_conv_dummy_ops = {
.get_format = snd_stm_conv_dummy_get_format,
.get_oversampling = snd_stm_conv_dummy_get_oversampling,
};
/*
* Platform driver routines
*/
static int snd_stm_conv_dummy_probe(struct platform_device *pdev)
{
struct snd_stm_conv_dummy *conv_dummy;
snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&pdev->dev));
BUG_ON(!pdev->dev.platform_data);
conv_dummy = kzalloc(sizeof(*conv_dummy), GFP_KERNEL);
if (!conv_dummy) {
snd_stm_printe("Can't allocate memory "
"for a device description!\n");
return -ENOMEM;
}
snd_stm_magic_set(conv_dummy);
conv_dummy->info = pdev->dev.platform_data;
snd_stm_printd(0, "This dummy DAC is attached to PCM player '%s'.\n",
conv_dummy->info->source_bus_id);
conv_dummy->converter = snd_stm_conv_register_converter(
conv_dummy->info->group,
&snd_stm_conv_dummy_ops, conv_dummy,
&platform_bus_type, conv_dummy->info->source_bus_id,
conv_dummy->info->channel_from,
conv_dummy->info->channel_to, NULL);
if (!conv_dummy->converter) {
snd_stm_printe("Can't attach to PCM player!\n");
return -EINVAL;
}
/* Done now */
platform_set_drvdata(pdev, conv_dummy);
return 0;
}
static int snd_stm_conv_dummy_remove(struct platform_device *pdev)
{
struct snd_stm_conv_dummy *conv_dummy = platform_get_drvdata(pdev);
BUG_ON(!conv_dummy);
BUG_ON(!snd_stm_magic_valid(conv_dummy));
snd_stm_conv_unregister_converter(conv_dummy->converter);
snd_stm_magic_clear(conv_dummy);
kfree(conv_dummy);
return 0;
}
static struct platform_driver snd_stm_conv_dummy_driver = {
.driver.name = "snd_conv_dummy",
.probe = snd_stm_conv_dummy_probe,
.remove = snd_stm_conv_dummy_remove,
};
/*
* Initialization
*/
static int __init snd_stm_conv_dummy_init(void)
{
return platform_driver_register(&snd_stm_conv_dummy_driver);
}
static void __exit snd_stm_conv_dummy_exit(void)
{
platform_driver_unregister(&snd_stm_conv_dummy_driver);
}
MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
MODULE_DESCRIPTION("STMicroelectronics dummy audio converter driver");
MODULE_LICENSE("GPL");
module_init(snd_stm_conv_dummy_init);
module_exit(snd_stm_conv_dummy_exit);