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/*
* Copyright (C) 2014 Motorola, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <sound/soc.h>
/* codec private data */
struct soc_c55_private {
int mic_bias1_en_gpio;
int mic_bias3_en_gpio;
};
static const struct snd_soc_dapm_widget soc_c55_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "Voice Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_INPUT("MIC"),
};
static const struct snd_soc_dapm_route soc_c55_audio_map[] = {
{"ADC", NULL, "MIC"},
};
static const struct of_device_id soc_c55_of_match[] = {
{.compatible = "mot,soc-c55", },
{ },
};
MODULE_DEVICE_TABLE(of, soc_c55_of_match);
static int soc_codec_c55_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct soc_c55_private *priv = snd_soc_codec_get_drvdata(codec);
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
/* Enable mic biases */
gpio_set_value(priv->mic_bias1_en_gpio, 1);
gpio_set_value(priv->mic_bias3_en_gpio, 1);
}
break;
case SND_SOC_BIAS_OFF:
/* Disable mic biases */
gpio_set_value(priv->mic_bias1_en_gpio, 0);
gpio_set_value(priv->mic_bias3_en_gpio, 0);
break;
}
codec->dapm.bias_level = level;
return 0;
}
static struct snd_soc_dai_driver soc_codec_c55_dai = {
.name = "c55-voice",
.capture = {
.stream_name = "Voice Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_16000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
};
static int soc_codec_c55_probe(struct snd_soc_codec *codec)
{
struct soc_c55_private *c55;
int gpio;
int ret;
c55 = devm_kzalloc(codec->dev, sizeof(struct soc_c55_private),
GFP_KERNEL);
if (c55 == NULL) {
dev_err(codec->dev, "Can not allocate memory\n");
return -ENOMEM;
}
snd_soc_codec_set_drvdata(codec, c55);
#ifdef CONFIG_OF
if (of_match_device(soc_c55_of_match, codec->dev)) {
gpio = of_get_named_gpio(codec->dev->of_node,
"mot,mic_bias1_en", 0);
ret = (gpio < 0) ? -ENODEV : gpio_request(gpio, "mic_bias1_en");
if (ret) {
dev_err(codec->dev,
"Failed acquiring Mic Bias 1 En GPIO-%d (%d)\n",
gpio, ret);
return ret;
}
gpio_direction_output(gpio, 0);
c55->mic_bias1_en_gpio = gpio;
gpio = of_get_named_gpio(codec->dev->of_node,
"mot,mic_bias3_en", 0);
ret = (gpio < 0) ? -ENODEV : gpio_request(gpio, "mic_bias3_en");
if (ret) {
dev_err(codec->dev,
"Failed acquiring Mic Bias 3 En GPIO-%d (%d)\n",
gpio, ret);
return ret;
}
gpio_direction_output(gpio, 0);
c55->mic_bias3_en_gpio = gpio;
}
#endif
return 0;
}
static int soc_codec_c55_remove(struct snd_soc_codec *codec)
{
struct soc_c55_private *priv = snd_soc_codec_get_drvdata(codec);
soc_codec_c55_set_bias_level(codec, SND_SOC_BIAS_OFF);
if (priv) {
gpio_free(priv->mic_bias1_en_gpio);
gpio_free(priv->mic_bias3_en_gpio);
}
return 0;
}
static struct snd_soc_codec_driver soc_codec_c55 = {
.probe = soc_codec_c55_probe,
.remove = soc_codec_c55_remove,
.set_bias_level = soc_codec_c55_set_bias_level,
.idle_bias_off = true,
.dapm_widgets = soc_c55_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(soc_c55_dapm_widgets),
.dapm_routes = soc_c55_audio_map,
.num_dapm_routes = ARRAY_SIZE(soc_c55_audio_map),
};
static int soc_c55_probe(struct platform_device *pdev)
{
return snd_soc_register_codec(&pdev->dev, &soc_codec_c55,
&soc_codec_c55_dai, 1);
}
static int soc_c55_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static struct platform_driver soc_c55_driver = {
.probe = soc_c55_probe,
.remove = soc_c55_remove,
.driver = {
.name = "soc-c55",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(soc_c55_of_match),
},
};
module_platform_driver(soc_c55_driver);
MODULE_AUTHOR("Motorola");
MODULE_DESCRIPTION("ALSA SoC c55 audio codec driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-c55");
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