sound/soc/samsung/s3c24xx_simtec.c - linux - Git at Google

 /* sound/soc/samsung/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/gpio.h>
 #include <linux/clk.h>
 #include <linux/module.h>

 #include <sound/soc.h>

 #include <linux/platform_data/asoc-s3c24xx_simtec.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_pcm_runtime *rtd)
 {
 	struct snd_soc_card *card = rtd->card;

 	if (pdata->amp_gpio > 0) {
 		pr_debug("%s: adding amp routes\n", __func__);

 		snd_soc_add_card_controls(card, 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_card_controls(card, 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->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	int 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 const 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, currently 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
 static int simtec_audio_resume(struct device *dev)
 {
 	simtec_call_startup(pdata);
 	return 0;
 }

 const struct dev_pm_ops simtec_audio_pmops = {
 	.resume	= simtec_audio_resume,
 };
 EXPORT_SYMBOL_GPL(simtec_audio_pmops);
 #endif

 int simtec_audio_core_probe(struct platform_device *pdev,
 			    struct snd_soc_card *card)
 {
 	struct platform_device *snd_dev;
 	int ret;

 	card->dai_link->ops = &simtec_snd_ops;
 	card->dai_link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 				  SND_SOC_DAIFMT_CBM_CFM;

 	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, card);

 	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 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");
	/* sound/soc/samsung/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/gpio.h>
	#include <linux/clk.h>
	#include <linux/module.h>

	#include <sound/soc.h>

	#include <linux/platform_data/asoc-s3c24xx_simtec.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_pcm_runtime *rtd)
	{
	struct snd_soc_card *card = rtd->card;

	if (pdata->amp_gpio > 0) {
	pr_debug("%s: adding amp routes\n", __func__);

	snd_soc_add_card_controls(card, 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_card_controls(card, 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->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int 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 const 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, currently 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
	static int simtec_audio_resume(struct device *dev)
	{
	simtec_call_startup(pdata);
	return 0;
	}

	const struct dev_pm_ops simtec_audio_pmops = {
	.resume = simtec_audio_resume,
	};
	EXPORT_SYMBOL_GPL(simtec_audio_pmops);
	#endif

	int simtec_audio_core_probe(struct platform_device *pdev,
	struct snd_soc_card *card)
	{
	struct platform_device *snd_dev;
	int ret;

	card->dai_link->ops = &simtec_snd_ops;
	card->dai_link->dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_CBM_CFM;

	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, card);

	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 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");