satip-axe/kernel/sound/stm/conv_dac_sc.c

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/*
* STMicroelectronics System-on-Chips' internal (sysconf controlled)
* audio 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/list.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/stm/sysconf.h>
#include <sound/core.h>
#include <sound/info.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);
/*
* Hardware-related definitions
*/
#define FORMAT (SND_STM_FORMAT__I2S | SND_STM_FORMAT__SUBFRAME_32_BITS)
#define OVERSAMPLING 256
/*
* Internal DAC instance structure
*/
struct snd_stm_conv_dac_sc {
/* System informations */
struct snd_stm_conv_converter *converter;
const char *bus_id;
/* Control bits */
struct sysconf_field *nrst;
struct sysconf_field *mode;
struct sysconf_field *nsb;
struct sysconf_field *softmute;
struct sysconf_field *pdana;
struct sysconf_field *pndbg;
snd_stm_magic_field;
};
/*
* Converter interface implementation
*/
static unsigned int snd_stm_conv_dac_sc_get_format(void *priv)
{
snd_stm_printd(1, "snd_stm_conv_dac_sc_get_format(priv=%p)\n", priv);
return FORMAT;
}
static int snd_stm_conv_dac_sc_get_oversampling(void *priv)
{
snd_stm_printd(1, "snd_stm_conv_dac_sc_get_oversampling(priv=%p)\n",
priv);
return OVERSAMPLING;
}
static int snd_stm_conv_dac_sc_set_enabled(int enabled, void *priv)
{
struct snd_stm_conv_dac_sc *conv_dac_sc = priv;
snd_stm_printd(1, "snd_stm_conv_dac_sc_set_enabled(enabled=%d, "
"priv=%p)\n", enabled, priv);
BUG_ON(!conv_dac_sc);
BUG_ON(!snd_stm_magic_valid(conv_dac_sc));
snd_stm_printd(1, "%sabling DAC %s's digital part.\n",
enabled ? "En" : "Dis", conv_dac_sc->bus_id);
if (enabled) {
sysconf_write(conv_dac_sc->nsb, 1); /* NORMAL */
sysconf_write(conv_dac_sc->nrst, 1); /* NORMAL */
} else {
sysconf_write(conv_dac_sc->nrst, 0); /* RESET */
sysconf_write(conv_dac_sc->nsb, 0); /* POWER_DOWN */
}
return 0;
}
static int snd_stm_conv_dac_sc_set_muted(int muted, void *priv)
{
struct snd_stm_conv_dac_sc *conv_dac_sc = priv;
snd_stm_printd(1, "snd_stm_conv_dac_sc_set_muted(muted=%d, priv=%p)\n",
muted, priv);
BUG_ON(!conv_dac_sc);
BUG_ON(!snd_stm_magic_valid(conv_dac_sc));
snd_stm_printd(1, "%suting DAC %s.\n", muted ? "M" : "Unm",
conv_dac_sc->bus_id);
if (muted)
sysconf_write(conv_dac_sc->softmute, 1); /* MUTE */
else
sysconf_write(conv_dac_sc->softmute, 0); /* NORMAL */
return 0;
}
static struct snd_stm_conv_ops snd_stm_conv_dac_sc_ops = {
.get_format = snd_stm_conv_dac_sc_get_format,
.get_oversampling = snd_stm_conv_dac_sc_get_oversampling,
.set_enabled = snd_stm_conv_dac_sc_set_enabled,
.set_muted = snd_stm_conv_dac_sc_set_muted,
};
/*
* ALSA lowlevel device implementation
*/
static int snd_stm_conv_dac_sc_register(struct snd_device *snd_device)
{
struct snd_stm_conv_dac_sc *conv_dac_sc =
snd_device->device_data;
BUG_ON(!conv_dac_sc);
BUG_ON(!snd_stm_magic_valid(conv_dac_sc));
/* Initialize DAC with digital part down, analog up and muted */
sysconf_write(conv_dac_sc->nrst, 0); /* RESET */
sysconf_write(conv_dac_sc->mode, 0); /* DEFAULT */
sysconf_write(conv_dac_sc->nsb, 0); /* POWER_DOWN */
sysconf_write(conv_dac_sc->softmute, 1); /* MUTE */
sysconf_write(conv_dac_sc->pdana, 1); /* NORMAL */
sysconf_write(conv_dac_sc->pndbg, 1); /* NORMAL */
return 0;
}
static int __exit snd_stm_conv_dac_sc_disconnect(struct snd_device *snd_device)
{
struct snd_stm_conv_dac_sc *conv_dac_sc =
snd_device->device_data;
BUG_ON(!conv_dac_sc);
BUG_ON(!snd_stm_magic_valid(conv_dac_sc));
/* Global power done & mute mode */
sysconf_write(conv_dac_sc->nrst, 0); /* RESET */
sysconf_write(conv_dac_sc->mode, 0); /* DEFAULT */
sysconf_write(conv_dac_sc->nsb, 0); /* POWER_DOWN */
sysconf_write(conv_dac_sc->softmute, 1); /* MUTE */
sysconf_write(conv_dac_sc->pdana, 0); /* POWER_DOWN */
sysconf_write(conv_dac_sc->pndbg, 0); /* POWER_DOWN */
return 0;
}
static struct snd_device_ops snd_stm_conv_dac_sc_snd_device_ops = {
.dev_register = snd_stm_conv_dac_sc_register,
.dev_disconnect = snd_stm_conv_dac_sc_disconnect,
};
/*
* Platform driver routines
*/
static int snd_stm_conv_dac_sc_probe(struct platform_device *pdev)
{
int result = 0;
struct snd_stm_conv_dac_sc_info *info =
pdev->dev.platform_data;
struct snd_stm_conv_dac_sc *conv_dac_sc;
struct snd_card *card = snd_stm_card_get();
snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&pdev->dev));
BUG_ON(!card);
BUG_ON(!info);
conv_dac_sc = kzalloc(sizeof(*conv_dac_sc), GFP_KERNEL);
if (!conv_dac_sc) {
snd_stm_printe("Can't allocate memory "
"for a device description!\n");
result = -ENOMEM;
goto error_alloc;
}
snd_stm_magic_set(conv_dac_sc);
conv_dac_sc->bus_id = dev_name(&pdev->dev);
/* Get resources */
conv_dac_sc->nrst = sysconf_claim(info->nrst.group, info->nrst.num,
info->nrst.lsb, info->nrst.msb, "NRST");
BUG_ON(!conv_dac_sc->nrst);
conv_dac_sc->mode = sysconf_claim(info->mode.group, info->mode.num,
info->mode.lsb, info->mode.msb, "MODE");
BUG_ON(!conv_dac_sc->mode);
conv_dac_sc->nsb = sysconf_claim(info->nsb.group, info->nsb.num,
info->nsb.lsb, info->nsb.msb, "NSB");
BUG_ON(!conv_dac_sc->nsb);
conv_dac_sc->softmute = sysconf_claim(info->softmute.group,
info->softmute.num, info->softmute.lsb,
info->softmute.msb, "SOFTMUTE");
BUG_ON(!conv_dac_sc->softmute);
conv_dac_sc->pdana = sysconf_claim(info->pdana.group, info->pdana.num,
info->pdana.lsb, info->pdana.msb, "PDANA");
BUG_ON(!conv_dac_sc->pdana);
conv_dac_sc->pndbg = sysconf_claim(info->pndbg.group, info->pndbg.num,
info->pndbg.lsb, info->pndbg.msb, "PNDBG");
BUG_ON(!conv_dac_sc->pndbg);
/* Get connections */
BUG_ON(!info->source_bus_id);
snd_stm_printd(0, "This DAC is attached to PCM player '%s'.\n",
info->source_bus_id);
conv_dac_sc->converter = snd_stm_conv_register_converter(
"Analog Output", &snd_stm_conv_dac_sc_ops, conv_dac_sc,
&platform_bus_type, info->source_bus_id,
info->channel_from, info->channel_to, NULL);
if (!conv_dac_sc->converter) {
snd_stm_printe("Can't attach to PCM player!\n");
goto error_attach;
}
/* Create ALSA lowlevel device*/
result = snd_device_new(card, SNDRV_DEV_LOWLEVEL, conv_dac_sc,
&snd_stm_conv_dac_sc_snd_device_ops);
if (result < 0) {
snd_stm_printe("ALSA low level device creation failed!\n");
goto error_device;
}
/* Done now */
platform_set_drvdata(pdev, conv_dac_sc);
return 0;
error_device:
error_attach:
snd_stm_magic_clear(conv_dac_sc);
kfree(conv_dac_sc);
error_alloc:
return result;
}
static int snd_stm_conv_dac_sc_remove(struct platform_device *pdev)
{
struct snd_stm_conv_dac_sc *conv_dac_sc = platform_get_drvdata(pdev);
BUG_ON(!conv_dac_sc);
BUG_ON(!snd_stm_magic_valid(conv_dac_sc));
snd_stm_conv_unregister_converter(conv_dac_sc->converter);
sysconf_release(conv_dac_sc->nrst);
sysconf_release(conv_dac_sc->mode);
sysconf_release(conv_dac_sc->nsb);
sysconf_release(conv_dac_sc->softmute);
sysconf_release(conv_dac_sc->pdana);
sysconf_release(conv_dac_sc->pndbg);
snd_stm_magic_clear(conv_dac_sc);
kfree(conv_dac_sc);
return 0;
}
static struct platform_driver snd_stm_conv_dac_sc_driver = {
.driver.name = "snd_conv_dac_sc",
.probe = snd_stm_conv_dac_sc_probe,
.remove = snd_stm_conv_dac_sc_remove,
};
/*
* Initialization
*/
static int __init snd_stm_conv_dac_sc_init(void)
{
return platform_driver_register(&snd_stm_conv_dac_sc_driver);
}
static void __exit snd_stm_conv_dac_sc_exit(void)
{
platform_driver_unregister(&snd_stm_conv_dac_sc_driver);
}
MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
MODULE_DESCRIPTION("STMicroelectronics sysconf-based audio DAC driver");
MODULE_LICENSE("GPL");
module_init(snd_stm_conv_dac_sc_init);
module_exit(snd_stm_conv_dac_sc_exit);