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