/* sound/soc/s3c24xx/s3c24xx_simtec.c
*
* Copyright 2009 Simtec Electronics
*
* 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.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <plat/audio-simtec.h>
#include "s3c-dma.h"
#include "s3c24xx-i2s.h"
#include "s3c24xx_simtec.h"
static struct s3c24xx_audio_simtec_pdata *pdata;
static struct clk *xtal_clk;
static int spk_gain;
static int spk_unmute;
/**
* speaker_gain_get - read the speaker gain setting.
* @kcontrol: The control for the speaker gain.
* @ucontrol: The value that needs to be updated.
*
* Read the value for the AMP gain control.
*/
static int speaker_gain_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
ucontrol->value.integer.value[0] = spk_gain;
return 0;
}
/**
* speaker_gain_set - set the value of the speaker amp gain
* @value: The value to write.
*/
static void speaker_gain_set(int value)
{
gpio_set_value_cansleep(pdata->amp_gain[0], value & 1);
gpio_set_value_cansleep(pdata->amp_gain[1], value >> 1);
}
/**
* speaker_gain_put - set the speaker gain setting.
* @kcontrol: The control for the speaker gain.
* @ucontrol: The value that needs to be set.
*
* Set the value of the speaker gain from the specified
* @ucontrol setting.
*
* Note, if the speaker amp is muted, then we do not set a gain value
* as at-least one of the ICs that is fitted will try and power up even
* if the main control is set to off.
*/
static int speaker_gain_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
int value = ucontrol->value.integer.value[0];
spk_gain = value;
if (!spk_unmute)
speaker_gain_set(value);
return 0;
}
static const struct snd_kcontrol_new amp_gain_controls[] = {
SOC_SINGLE_EXT("Speaker Gain", 0, 0, 3, 0,
speaker_gain_get, speaker_gain_put),
};
/**
* spk_unmute_state - set the unmute state of the speaker
* @to: zero to unmute, non-zero to ununmute.
*/
static void spk_unmute_state(int to)
{
pr_debug("%s: to=%d\n", __func__, to);
spk_unmute = to;
gpio_set_value(pdata->amp_gpio, to);
/* if we're umuting, also re-set the gain */
if (to && pdata->amp_gain[0] > 0)
speaker_gain_set(spk_gain);
}
/**
* speaker_unmute_get - read the speaker unmute setting.
* @kcontrol: The control for the speaker gain.
* @ucontrol: The value that needs to be updated.
*
* Read the value for the AMP gain control.
*/
static int speaker_unmute_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
ucontrol->value.integer.value[0] = spk_unmute;
return 0;
}
/**
* speaker_unmute_put - set the speaker unmute setting.
* @kcontrol: The control for the speaker gain.
* @ucontrol: The value that needs to be set.
*
* Set the value of the speaker gain from the specified
* @ucontrol setting.
*/
static int speaker_unmute_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
spk_unmute_state(ucontrol->value.integer.value[0]);
return 0;
}
/* This is added as a manual control as the speaker amps create clicks
* when their power state is changed, which are far more noticeable than
* anything produced by the CODEC itself.
*/
static const struct snd_kcontrol_new amp_unmute_controls[] = {
SOC_SINGLE_EXT("Speaker Switch", 0, 0, 1, 0,
speaker_unmute_get, speaker_unmute_put),
};
void simtec_audio_init(struct snd_soc_codec *codec)
{
if (pdata->amp_gpio > 0) {
pr_debug("%s: adding amp routes\n", __func__);
snd_soc_add_controls(codec, amp_unmute_controls,
ARRAY_SIZE(amp_unmute_controls));
}
if (pdata->amp_gain[0] > 0) {
pr_debug("%s: adding amp controls\n", __func__);
snd_soc_add_controls(codec, amp_gain_controls,
ARRAY_SIZE(amp_gain_controls));
}
}
EXPORT_SYMBOL_GPL(simtec_audio_init);
#define CODEC_CLOCK 12000000
/**
* simtec_hw_params - update hardware parameters
* @substream: The audio substream instance.
* @params: The parameters requested.
*
* Update the codec data routing and configuration settings
* from the supplied data.
*/
static int simtec_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
int ret;
/* Set the CODEC as the bus clock master, I2S */
ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM);
if (ret) {
pr_err("%s: failed set cpu dai format\n", __func__);
return ret;
}
/* Set the CODEC as the bus clock master */
ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM);
if (ret) {
pr_err("%s: failed set codec dai format\n", __func__);
return ret;
}
ret = snd_soc_dai_set_sysclk(codec_dai, 0,
CODEC_CLOCK, SND_SOC_CLOCK_IN);
if (ret) {
pr_err( "%s: failed setting codec sysclk\n", __func__);
return ret;
}
if (pdata->use_mpllin) {
ret = snd_soc_dai_set_sysclk(cpu_dai, S3C24XX_CLKSRC_MPLL,
0, SND_SOC_CLOCK_OUT);
if (ret) {
pr_err("%s: failed to set MPLLin as clksrc\n",
__func__);
return ret;
}
}
if (pdata->output_cdclk) {
int cdclk_scale;
cdclk_scale = clk_get_rate(xtal_clk) / CODEC_CLOCK;
cdclk_scale--;
ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
cdclk_scale);
}
return 0;
}
static int simtec_call_startup(struct s3c24xx_audio_simtec_pdata *pd)
{
/* call any board supplied startup code, this currently only
* covers the bast/vr1000 which have a CPLD in the way of the
* LRCLK */
if (pd->startup)
pd->startup();
return 0;
}
static struct snd_soc_ops simtec_snd_ops = {
.hw_params = simtec_hw_params,
};
/**
* attach_gpio_amp - get and configure the necessary gpios
* @dev: The device we're probing.
* @pd: The platform data supplied by the board.
*
* If there is a GPIO based amplifier attached to the board, claim
* the necessary GPIO lines for it, and set default values.
*/
static int attach_gpio_amp(struct device *dev,
struct s3c24xx_audio_simtec_pdata *pd)
{
int ret;
/* attach gpio amp gain (if any) */
if (pdata->amp_gain[0] > 0) {
ret = gpio_request(pd->amp_gain[0], "gpio-amp-gain0");
if (ret) {
dev_err(dev, "cannot get amp gpio gain0\n");
return ret;
}
ret = gpio_request(pd->amp_gain[1], "gpio-amp-gain1");
if (ret) {
dev_err(dev, "cannot get amp gpio gain1\n");
gpio_free(pdata->amp_gain[0]);
return ret;
}
gpio_direction_output(pd->amp_gain[0], 0);
gpio_direction_output(pd->amp_gain[1], 0);
}
/* note, curently we assume GPA0 isn't valid amp */
if (pdata->amp_gpio > 0) {
ret = gpio_request(pd->amp_gpio, "gpio-amp");
if (ret) {
dev_err(dev, "cannot get amp gpio %d (%d)\n",
pd->amp_gpio, ret);
goto err_amp;
}
/* set the amp off at startup */
spk_unmute_state(0);
}
return 0;
err_amp:
if (pd->amp_gain[0] > 0) {
gpio_free(pd->amp_gain[0]);
gpio_free(pd->amp_gain[1]);
}
return ret;
}
static void detach_gpio_amp(struct s3c24xx_audio_simtec_pdata *pd)
{
if (pd->amp_gain[0] > 0) {
gpio_free(pd->amp_gain[0]);
gpio_free(pd->amp_gain[1]);
}
if (pd->amp_gpio > 0)
gpio_free(pd->amp_gpio);
}
#ifdef CONFIG_PM
int simtec_audio_resume(struct device *dev)
{
simtec_call_startup(pdata);
return 0;
}
struct dev_pm_ops simtec_audio_pmops = {
.resume = simtec_audio_resume,
};
EXPORT_SYMBOL_GPL(simtec_audio_pmops);
#endif
int __devinit simtec_audio_core_probe(struct platform_device *pdev,
struct snd_soc_device *socdev)
{
struct platform_device *snd_dev;
int ret;
socdev->card->dai_link->ops = &simtec_snd_ops;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data supplied\n");
return -EINVAL;
}
simtec_call_startup(pdata);
xtal_clk = clk_get(&pdev->dev, "xtal");
if (IS_ERR(xtal_clk)) {
dev_err(&pdev->dev, "could not get clkout0\n");
return -EINVAL;
}
dev_info(&pdev->dev, "xtal rate is %ld\n", clk_get_rate(xtal_clk));
ret = attach_gpio_amp(&pdev->dev, pdata);
if (ret)
goto err_clk;
snd_dev = platform_device_alloc("soc-audio", -1);
if (!snd_dev) {
dev_err(&pdev->dev, "failed to alloc soc-audio devicec\n");
ret = -ENOMEM;
goto err_gpio;
}
platform_set_drvdata(snd_dev, socdev);
socdev->dev = &snd_dev->dev;
ret = platform_device_add(snd_dev);
if (ret) {
dev_err(&pdev->dev, "failed to add soc-audio dev\n");
goto err_pdev;
}
platform_set_drvdata(pdev, snd_dev);
return 0;
err_pdev:
platform_device_put(snd_dev);
err_gpio:
detach_gpio_amp(pdata);
err_clk:
clk_put(xtal_clk);
return ret;
}
EXPORT_SYMBOL_GPL(simtec_audio_core_probe);
int __devexit simtec_audio_remove(struct platform_device *pdev)
{
struct platform_device *snd_dev = platform_get_drvdata(pdev);
platform_device_unregister(snd_dev);
detach_gpio_amp(pdata);
clk_put(xtal_clk);
return 0;
}
EXPORT_SYMBOL_GPL(simtec_audio_remove);
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("ALSA SoC Simtec Audio common support");
MODULE_LICENSE("GPL");
