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Commit 52f19b14 authored by Bo Shen's avatar Bo Shen Committed by Mark Brown
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ASoC: atmel: add wm8904 based audio machine driver 



Add wm8904 based audio machine driver for Atmel EK board

The following ek board based on it
  - at91sam9n12ek
  - sama5d3xek (d31, d33, d34, d35)

Signed-off-by: default avatarBo Shen <voice.shen@atmel.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 95e0e07e

Documentation/devicetree/bindings/sound/atmel-wm8904.txt

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Atmel ASoC driver with wm8904 audio codec complex



Required properties:

  - compatible: "atmel,asoc-wm8904"

  - atmel,model: The user-visible name of this sound complex.

  - atmel,audio-routing: A list of the connections between audio components.

    Each entry is a pair of strings, the first being the connection's sink,

    the second being the connection's source. Valid names for sources and

    sinks are the WM8904's pins, and the jacks on the board:



    WM8904 pins:



    * IN1L

    * IN1R

    * IN2L

    * IN2R

    * IN3L

    * IN3R

    * HPOUTL

    * HPOUTR

    * LINEOUTL

    * LINEOUTR

    * MICBIAS



    Board connectors:



    * Headphone Jack

    * Line In Jack

    * Mic



  - atmel,ssc-controller: The phandle of the SSC controller

  - atmel,audio-codec: The phandle of the WM8904 audio codec



Optional properties:

  - pinctrl-names, pinctrl-0: Please refer to pinctrl-bindings.txt



Example:

sound {

	compatible = "atmel,asoc-wm8904";

	pinctrl-names = "default";

	pinctrl-0 = <&pinctrl_pck0_as_mck>;



	atmel,model = "wm8904 @ AT91SAM9N12EK";



	atmel,audio-routing =

		"Headphone Jack", "HPOUTL",

		"Headphone Jack", "HPOUTR",

		"IN2L", "Line In Jack",

		"IN2R", "Line In Jack",

		"Mic", "MICBIAS",

		"IN1L", "Mic";



	atmel,ssc-controller = <&ssc0>;

	atmel,audio-codec = <&wm8904>;

};

sound/soc/atmel/Kconfig

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@@ -33,6 +33,16 @@ config SND_AT91_SOC_SAM9G20_WM8731 
	  Say Y if you want to add support for SoC audio on WM8731-based

	  Say Y if you want to add support for SoC audio on WM8731-based

	  AT91sam9g20 evaluation board.

	  AT91sam9g20 evaluation board.





config SND_ATMEL_SOC_WM8904

	tristate "Atmel ASoC driver for boards using WM8904 codec"

	depends on ARCH_AT91 && ATMEL_SSC && SND_ATMEL_SOC

	select SND_ATMEL_SOC_SSC

	select SND_ATMEL_SOC_DMA

	select SND_SOC_WM8904

	help

	  Say Y if you want to add support for Atmel ASoC driver for boards using

	  WM8904 codec.



config SND_AT91_SOC_AFEB9260

config SND_AT91_SOC_AFEB9260

	tristate "SoC Audio support for AFEB9260 board"

	tristate "SoC Audio support for AFEB9260 board"

	depends on ARCH_AT91 && ATMEL_SSC && ARCH_AT91 && MACH_AFEB9260 && SND_ATMEL_SOC

	depends on ARCH_AT91 && ATMEL_SSC && ARCH_AT91 && MACH_AFEB9260 && SND_ATMEL_SOC

sound/soc/atmel/Makefile

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@@ -11,6 +11,8 @@ obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o 




# AT91 Machine Support

# AT91 Machine Support

snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o

snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o

snd-atmel-soc-wm8904-objs := atmel_wm8904.o





obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o

obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o

obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o

obj-$(CONFIG_SND_AT91_SOC_AFEB9260) += snd-soc-afeb9260.o
 
obj-$(CONFIG_SND_AT91_SOC_AFEB9260) += snd-soc-afeb9260.o

sound/soc/atmel/atmel_wm8904.c

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/*

 * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.

 *

 * Copyright (C) 2012 Atmel

 *

 * Author: Bo Shen <voice.shen@atmel.com>

 *

 * GPLv2 or later

 */



#include <linux/clk.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/pinctrl/consumer.h>



#include <sound/soc.h>



#include "../codecs/wm8904.h"

#include "atmel_ssc_dai.h"



#define MCLK_RATE 32768



static struct clk *mclk;



static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {

	SND_SOC_DAPM_HP("Headphone Jack", NULL),

	SND_SOC_DAPM_MIC("Mic", NULL),

	SND_SOC_DAPM_LINE("Line In Jack", NULL),

};



static int atmel_asoc_wm8904_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;

	int ret;



	ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,

		32768, params_rate(params) * 256);

	if (ret < 0) {

		pr_err("%s - failed to set wm8904 codec PLL.", __func__);

		return ret;

	}



	/*

	 * As here wm8904 use FLL output as its system clock

	 * so calling set_sysclk won't care freq parameter

	 * then we pass 0

	 */

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,

			0, SND_SOC_CLOCK_IN);

	if (ret < 0) {

		pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);

		return ret;

	}



	return 0;

}



static struct snd_soc_ops atmel_asoc_wm8904_ops = {

	.hw_params = atmel_asoc_wm8904_hw_params,

};



static int atmel_set_bias_level(struct snd_soc_card *card,

		struct snd_soc_dapm_context *dapm,

		enum snd_soc_bias_level level)

{

	if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {

		switch (level) {

		case SND_SOC_BIAS_PREPARE:

			clk_prepare_enable(mclk);

			break;

		case SND_SOC_BIAS_OFF:

			clk_disable_unprepare(mclk);

			break;

		default:

			break;

		}

	}



	return 0;

};



static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {

	.name = "WM8904",

	.stream_name = "WM8904 PCM",

	.codec_dai_name = "wm8904-hifi",

	.dai_fmt = SND_SOC_DAIFMT_I2S

		| SND_SOC_DAIFMT_NB_NF

		| SND_SOC_DAIFMT_CBM_CFM,

	.ops = &atmel_asoc_wm8904_ops,

};



static struct snd_soc_card atmel_asoc_wm8904_card = {

	.name = "atmel_asoc_wm8904",

	.owner = THIS_MODULE,

	.set_bias_level = atmel_set_bias_level,

	.dai_link = &atmel_asoc_wm8904_dailink,

	.num_links = 1,

	.dapm_widgets = atmel_asoc_wm8904_dapm_widgets,

	.num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),

	.fully_routed = true,

};



static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	struct device_node *codec_np, *cpu_np;

	struct snd_soc_card *card = &atmel_asoc_wm8904_card;

	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;

	int ret;



	if (!np) {

		dev_err(&pdev->dev, "only device tree supported\n");

		return -EINVAL;

	}



	ret = snd_soc_of_parse_card_name(card, "atmel,model");

	if (ret) {

		dev_err(&pdev->dev, "failed to parse card name\n");

		return ret;

	}



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

	if (ret) {

		dev_err(&pdev->dev, "failed to parse audio routing\n");

		return ret;

	}



	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);

	if (!cpu_np) {

		dev_err(&pdev->dev, "failed to get dai and pcm info\n");

		ret = -EINVAL;

		return ret;

	}

	dailink->cpu_of_node = cpu_np;

	dailink->platform_of_node = cpu_np;

	of_node_put(cpu_np);



	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);

	if (!codec_np) {

		dev_err(&pdev->dev, "failed to get codec info\n");

		ret = -EINVAL;

		return ret;

	}

	dailink->codec_of_node = codec_np;

	of_node_put(codec_np);



	return 0;

}



static int atmel_asoc_wm8904_probe(struct platform_device *pdev)

{

	struct snd_soc_card *card = &atmel_asoc_wm8904_card;

	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;

	struct clk *clk_src;

	struct pinctrl *pinctrl;

	int id, ret;



	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);

	if (IS_ERR(pinctrl)) {

		dev_err(&pdev->dev, "failed to request pinctrl\n");

		return PTR_ERR(pinctrl);

	}



	card->dev = &pdev->dev;

	ret = atmel_asoc_wm8904_dt_init(pdev);

	if (ret) {

		dev_err(&pdev->dev, "failed to init dt info\n");

		return ret;

	}



	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");

	ret = atmel_ssc_set_audio(id);

	if (ret != 0) {

		dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);

		return ret;

	}



	mclk = clk_get(NULL, "pck0");

	if (IS_ERR(mclk)) {

		dev_err(&pdev->dev, "failed to get pck0\n");

		ret = PTR_ERR(mclk);

		goto err_set_audio;

	}



	clk_src = clk_get(NULL, "clk32k");

	if (IS_ERR(clk_src)) {

		dev_err(&pdev->dev, "failed to get clk32k\n");

		ret = PTR_ERR(clk_src);

		goto err_set_audio;

	}



	ret = clk_set_parent(mclk, clk_src);

	clk_put(clk_src);

	if (ret != 0) {

		dev_err(&pdev->dev, "failed to set MCLK parent\n");

		goto err_set_audio;

	}



	dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);

	clk_set_rate(mclk, MCLK_RATE);



	ret = snd_soc_register_card(card);

	if (ret) {

		dev_err(&pdev->dev, "snd_soc_register_card failed\n");

		goto err_set_audio;

	}



	return 0;



err_set_audio:

	atmel_ssc_put_audio(id);

	return ret;

}



static int atmel_asoc_wm8904_remove(struct platform_device *pdev)

{

	struct snd_soc_card *card = platform_get_drvdata(pdev);

	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;

	int id;



	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");



	snd_soc_unregister_card(card);

	atmel_ssc_put_audio(id);



	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {

	{ .compatible = "atmel,asoc-wm8904", },

	{ }

};

#endif



static struct platform_driver atmel_asoc_wm8904_driver = {

	.driver = {

		.name = "atmel-wm8904-audio",

		.owner = THIS_MODULE,

		.of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),

	},

	.probe = atmel_asoc_wm8904_probe,

	.remove = atmel_asoc_wm8904_remove,

};



module_platform_driver(atmel_asoc_wm8904_driver);



/* Module information */

MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");

MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");

MODULE_LICENSE("GPL");