sound/soc/atmel/sam9g20_wm8731.c - arm/linux - Git at Google

 /*
  * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
  * 			ATMEL AT91SAM9G20ek board.
  *
  *  Copyright (C) 2005 SAN People
  *  Copyright (C) 2008 Atmel
  *
  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
  *
  * Based on ati_b1_wm8731.c by:
  * Frank Mandarino <fmandarino@endrelia.com>
  * Copyright 2006 Endrelia Technologies Inc.
  * Based on corgi.c by:
  * Copyright 2005 Wolfson Microelectronics PLC.
  * Copyright 2005 Openedhand Ltd.
  *
  * 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/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/timer.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/of.h>

 #include <linux/atmel-ssc.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include "../codecs/wm8731.h"
 #include "atmel-pcm.h"
 #include "atmel_ssc_dai.h"

 #define MCLK_RATE 12000000

 /*
  * As shipped the board does not have inputs.  However, it is relatively
  * straightforward to modify the board to hook them up so support is left
  * in the driver.
  */
 #undef ENABLE_MIC_INPUT

 static struct clk *mclk;

 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
 					struct snd_soc_dapm_context *dapm,
 					enum snd_soc_bias_level level)
 {
 	static int mclk_on;
 	int ret = 0;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 	case SND_SOC_BIAS_PREPARE:
 		if (!mclk_on)
 			ret = clk_enable(mclk);
 		if (ret == 0)
 			mclk_on = 1;
 		break;

 	case SND_SOC_BIAS_OFF:
 	case SND_SOC_BIAS_STANDBY:
 		if (mclk_on)
 			clk_disable(mclk);
 		mclk_on = 0;
 		break;
 	}

 	return ret;
 }

 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
 	SND_SOC_DAPM_MIC("Int Mic", NULL),
 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
 };

 static const struct snd_soc_dapm_route intercon[] = {

 	/* speaker connected to LHPOUT/RHPOUT */
 	{"Ext Spk", NULL, "LHPOUT"},
 	{"Ext Spk", NULL, "RHPOUT"},

 	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
 	{"MICIN", NULL, "Mic Bias"},
 	{"Mic Bias", NULL, "Int Mic"},
 };

 /*
  * Logic for a wm8731 as connected on a at91sam9g20ek board.
  */
 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret;

 	printk(KERN_DEBUG
 			"at91sam9g20ek_wm8731 "
 			": at91sam9g20ek_wm8731_init() called\n");

 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 		MCLK_RATE, SND_SOC_CLOCK_IN);
 	if (ret < 0) {
 		printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 		return ret;
 	}

 #ifndef ENABLE_MIC_INPUT
 	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
 #endif

 	return 0;
 }

 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 	.name = "WM8731",
 	.stream_name = "WM8731 PCM",
 	.cpu_dai_name = "at91rm9200_ssc.0",
 	.codec_dai_name = "wm8731-hifi",
 	.init = at91sam9g20ek_wm8731_init,
 	.platform_name = "at91rm9200_ssc.0",
 	.codec_name = "wm8731.0-001b",
 	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 		   SND_SOC_DAIFMT_CBM_CFM,
 };

 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 	.name = "AT91SAMG20-EK",
 	.owner = THIS_MODULE,
 	.dai_link = &at91sam9g20ek_dai,
 	.num_links = 1,
 	.set_bias_level = at91sam9g20ek_set_bias_level,

 	.dapm_widgets = at91sam9g20ek_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
 	.dapm_routes = intercon,
 	.num_dapm_routes = ARRAY_SIZE(intercon),
 	.fully_routed = true,
 };

 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *codec_np, *cpu_np;
 	struct clk *pllb;
 	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
 	int ret;

 	if (!np) {
 		return -ENODEV;
 	}

 	ret = atmel_ssc_set_audio(0);
 	if (ret) {
 		dev_err(&pdev->dev, "ssc channel is not valid\n");
 		return -EINVAL;
 	}

 	/*
 	 * Codec MCLK is supplied by PCK0 - set it up.
 	 */
 	mclk = clk_get(NULL, "pck0");
 	if (IS_ERR(mclk)) {
 		printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 		ret = PTR_ERR(mclk);
 		goto err;
 	}

 	pllb = clk_get(NULL, "pllb");
 	if (IS_ERR(pllb)) {
 		printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 		ret = PTR_ERR(pllb);
 		goto err_mclk;
 	}
 	ret = clk_set_parent(mclk, pllb);
 	clk_put(pllb);
 	if (ret != 0) {
 		printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 		goto err_mclk;
 	}

 	clk_set_rate(mclk, MCLK_RATE);

 	card->dev = &pdev->dev;

 	/* Parse device node info */
 	ret = snd_soc_of_parse_card_name(card, "atmel,model");
 	if (ret)
 		goto err;

 	ret = snd_soc_of_parse_audio_routing(card,
 		"atmel,audio-routing");
 	if (ret)
 		goto err;

 	/* Parse codec info */
 	at91sam9g20ek_dai.codec_name = NULL;
 	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 	if (!codec_np) {
 		dev_err(&pdev->dev, "codec info missing\n");
 		return -EINVAL;
 	}
 	at91sam9g20ek_dai.codec_of_node = codec_np;

 	/* Parse dai and platform info */
 	at91sam9g20ek_dai.cpu_dai_name = NULL;
 	at91sam9g20ek_dai.platform_name = NULL;
 	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 	if (!cpu_np) {
 		dev_err(&pdev->dev, "dai and pcm info missing\n");
 		return -EINVAL;
 	}
 	at91sam9g20ek_dai.cpu_of_node = cpu_np;
 	at91sam9g20ek_dai.platform_of_node = cpu_np;

 	of_node_put(codec_np);
 	of_node_put(cpu_np);

 	ret = snd_soc_register_card(card);
 	if (ret) {
 		printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
 	}

 	return ret;

 err_mclk:
 	clk_put(mclk);
 	mclk = NULL;
 err:
 	atmel_ssc_put_audio(0);
 	return ret;
 }

 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);

 	clk_disable(mclk);
 	mclk = NULL;
 	snd_soc_unregister_card(card);
 	atmel_ssc_put_audio(0);

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
 	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
 #endif

 static struct platform_driver at91sam9g20ek_audio_driver = {
 	.driver = {
 		.name	= "at91sam9g20ek-audio",
 		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
 	},
 	.probe	= at91sam9g20ek_audio_probe,
 	.remove	= at91sam9g20ek_audio_remove,
 };

 module_platform_driver(at91sam9g20ek_audio_driver);

 /* Module information */
 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 MODULE_ALIAS("platform:at91sam9g20ek-audio");
 MODULE_LICENSE("GPL");
	/*
	* sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
	* ATMEL AT91SAM9G20ek board.
	*
	* Copyright (C) 2005 SAN People
	* Copyright (C) 2008 Atmel
	*
	* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
	*
	* Based on ati_b1_wm8731.c by:
	* Frank Mandarino <fmandarino@endrelia.com>
	* Copyright 2006 Endrelia Technologies Inc.
	* Based on corgi.c by:
	* Copyright 2005 Wolfson Microelectronics PLC.
	* Copyright 2005 Openedhand Ltd.
	*
	* 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/module.h>
	#include <linux/moduleparam.h>
	#include <linux/kernel.h>
	#include <linux/clk.h>
	#include <linux/timer.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/of.h>

	#include <linux/atmel-ssc.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include "../codecs/wm8731.h"
	#include "atmel-pcm.h"
	#include "atmel_ssc_dai.h"

	#define MCLK_RATE 12000000

	/*
	* As shipped the board does not have inputs. However, it is relatively
	* straightforward to modify the board to hook them up so support is left
	* in the driver.
	*/
	#undef ENABLE_MIC_INPUT

	static struct clk *mclk;

	static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
	struct snd_soc_dapm_context *dapm,
	enum snd_soc_bias_level level)
	{
	static int mclk_on;
	int ret = 0;

	switch (level) {
	case SND_SOC_BIAS_ON:
	case SND_SOC_BIAS_PREPARE:
	if (!mclk_on)
	ret = clk_enable(mclk);
	if (ret == 0)
	mclk_on = 1;
	break;

	case SND_SOC_BIAS_OFF:
	case SND_SOC_BIAS_STANDBY:
	if (mclk_on)
	clk_disable(mclk);
	mclk_on = 0;
	break;
	}

	return ret;
	}

	static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
	SND_SOC_DAPM_MIC("Int Mic", NULL),
	SND_SOC_DAPM_SPK("Ext Spk", NULL),
	};

	static const struct snd_soc_dapm_route intercon[] = {

	/* speaker connected to LHPOUT/RHPOUT */
	{"Ext Spk", NULL, "LHPOUT"},
	{"Ext Spk", NULL, "RHPOUT"},

	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
	{"MICIN", NULL, "Mic Bias"},
	{"Mic Bias", NULL, "Int Mic"},
	};

	/*
	* Logic for a wm8731 as connected on a at91sam9g20ek board.
	*/
	static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret;

	printk(KERN_DEBUG
	"at91sam9g20ek_wm8731 "
	": at91sam9g20ek_wm8731_init() called\n");

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
	MCLK_RATE, SND_SOC_CLOCK_IN);
	if (ret < 0) {
	printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
	return ret;
	}

	#ifndef ENABLE_MIC_INPUT
	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
	#endif

	return 0;
	}

	static struct snd_soc_dai_link at91sam9g20ek_dai = {
	.name = "WM8731",
	.stream_name = "WM8731 PCM",
	.cpu_dai_name = "at91rm9200_ssc.0",
	.codec_dai_name = "wm8731-hifi",
	.init = at91sam9g20ek_wm8731_init,
	.platform_name = "at91rm9200_ssc.0",
	.codec_name = "wm8731.0-001b",
	.dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_CBM_CFM,
	};

	static struct snd_soc_card snd_soc_at91sam9g20ek = {
	.name = "AT91SAMG20-EK",
	.owner = THIS_MODULE,
	.dai_link = &at91sam9g20ek_dai,
	.num_links = 1,
	.set_bias_level = at91sam9g20ek_set_bias_level,

	.dapm_widgets = at91sam9g20ek_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
	.dapm_routes = intercon,
	.num_dapm_routes = ARRAY_SIZE(intercon),
	.fully_routed = true,
	};

	static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct device_node codec_np, cpu_np;
	struct clk *pllb;
	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
	int ret;

	if (!np) {
	return -ENODEV;
	}

	ret = atmel_ssc_set_audio(0);
	if (ret) {
	dev_err(&pdev->dev, "ssc channel is not valid\n");
	return -EINVAL;
	}

	/*
	* Codec MCLK is supplied by PCK0 - set it up.
	*/
	mclk = clk_get(NULL, "pck0");
	if (IS_ERR(mclk)) {
	printk(KERN_ERR "ASoC: Failed to get MCLK\n");
	ret = PTR_ERR(mclk);
	goto err;
	}

	pllb = clk_get(NULL, "pllb");
	if (IS_ERR(pllb)) {
	printk(KERN_ERR "ASoC: Failed to get PLLB\n");
	ret = PTR_ERR(pllb);
	goto err_mclk;
	}
	ret = clk_set_parent(mclk, pllb);
	clk_put(pllb);
	if (ret != 0) {
	printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
	goto err_mclk;
	}

	clk_set_rate(mclk, MCLK_RATE);

	card->dev = &pdev->dev;

	/* Parse device node info */
	ret = snd_soc_of_parse_card_name(card, "atmel,model");
	if (ret)
	goto err;

	ret = snd_soc_of_parse_audio_routing(card,
	"atmel,audio-routing");
	if (ret)
	goto err;

	/* Parse codec info */
	at91sam9g20ek_dai.codec_name = NULL;
	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
	if (!codec_np) {
	dev_err(&pdev->dev, "codec info missing\n");
	return -EINVAL;
	}
	at91sam9g20ek_dai.codec_of_node = codec_np;

	/* Parse dai and platform info */
	at91sam9g20ek_dai.cpu_dai_name = NULL;
	at91sam9g20ek_dai.platform_name = NULL;
	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
	if (!cpu_np) {
	dev_err(&pdev->dev, "dai and pcm info missing\n");
	return -EINVAL;
	}
	at91sam9g20ek_dai.cpu_of_node = cpu_np;
	at91sam9g20ek_dai.platform_of_node = cpu_np;

	of_node_put(codec_np);
	of_node_put(cpu_np);

	ret = snd_soc_register_card(card);
	if (ret) {
	printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
	}

	return ret;

	err_mclk:
	clk_put(mclk);
	mclk = NULL;
	err:
	atmel_ssc_put_audio(0);
	return ret;
	}

	static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	clk_disable(mclk);
	mclk = NULL;
	snd_soc_unregister_card(card);
	atmel_ssc_put_audio(0);

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
	#endif

	static struct platform_driver at91sam9g20ek_audio_driver = {
	.driver = {
	.name = "at91sam9g20ek-audio",
	.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
	},
	.probe = at91sam9g20ek_audio_probe,
	.remove = at91sam9g20ek_audio_remove,
	};

	module_platform_driver(at91sam9g20ek_audio_driver);

	/* Module information */
	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
	MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
	MODULE_ALIAS("platform:at91sam9g20ek-audio");
	MODULE_LICENSE("GPL");