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Commit fdbcb3cb authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Mark Brown
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ASoC: atmel: machine driver for at91sam9x5-wm8731 boards 



Description of the Asoc machine driver for an at91sam9x5 based board
with a wm8731 audio DAC. Wm8731 is clocked by a crystal and used as a
master on the SSC/I2S interface. Its connections are a headphone jack
and an Line input jack.

[Richard: this is based on an old patch from Nicolas that I forward
ported and reworked to use only device tree]

Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarRichard Genoud <richard.genoud@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 52f19b14

Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt

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* Atmel at91sam9x5ek wm8731 audio complex



Required properties:

  - compatible: "atmel,sam9x5-wm8731-audio"

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

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

  - atmel,audio-codec: The phandle of the WM8731 audio codec

  - 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.



Available audio endpoints for the audio-routing table:



Board connectors:

 * Headphone Jack

 * Line In Jack



wm8731 pins:

cf Documentation/devicetree/bindings/sound/wm8731.txt



Example:

sound {

	compatible = "atmel,sam9x5-wm8731-audio";



	atmel,model = "wm8731 @ AT91SAM9X5EK";



	atmel,audio-routing =

		"Headphone Jack", "RHPOUT",

		"Headphone Jack", "LHPOUT",

		"LLINEIN", "Line In Jack",

		"RLINEIN", "Line In Jack";



	atmel,ssc-controller = <&ssc0>;

	atmel,audio-codec = <&wm8731>;

};

Documentation/devicetree/bindings/sound/wm8731.txt

+9 −0
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@@ -16,3 +16,12 @@ codec: wm8731@1a { 
	compatible = "wlf,wm8731";

	reg = <0x1a>;

};



Available audio endpoints for an audio-routing table:

 * LOUT: Left Channel Line Output

 * ROUT: Right Channel Line Output

 * LHPOUT: Left Channel Headphone Output

 * RHPOUT: Right Channel Headphone Output

 * LLINEIN: Left Channel Line Input

 * RLINEIN: Right Channel Line Input

 * MICIN: Microphone Input

sound/soc/atmel/Kconfig

+10 −0
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@@ -43,6 +43,16 @@ config SND_ATMEL_SOC_WM8904 
	  Say Y if you want to add support for Atmel ASoC driver for boards using

	  WM8904 codec.



config SND_AT91_SOC_SAM9X5_WM8731

	tristate "SoC Audio support for WM8731-based at91sam9x5 board"

	depends on ATMEL_SSC && SND_ATMEL_SOC && SOC_AT91SAM9X5

	select SND_ATMEL_SOC_SSC

	select SND_ATMEL_SOC_DMA

	select SND_SOC_WM8731

	help

	  Say Y if you want to add support for audio SoC on an

	  at91sam9x5 based board that is using WM8731 codec.



config SND_AT91_SOC_AFEB9260

	tristate "SoC Audio support for AFEB9260 board"

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

sound/soc/atmel/Makefile

+2 −0
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@@ -12,7 +12,9 @@ obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o 
# AT91 Machine Support

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

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

snd-soc-sam9x5-wm8731-objs := sam9x5_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_SAM9X5_WM8731) += snd-soc-sam9x5-wm8731.o

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

sound/soc/atmel/sam9x5_wm8731.c

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/*

 * sam9x5_wm8731   --	SoC audio for AT91SAM9X5-based boards

 *			that are using WM8731 as codec.

 *

 *  Copyright (C) 2011 Atmel,

 *		  Nicolas Ferre <nicolas.ferre@atmel.com>

 *

 *  Copyright (C) 2013 Paratronic,

 *		  Richard Genoud <richard.genoud@gmail.com>

 *

 * Based on sam9g20_wm8731.c by:

 * Sedji Gaouaou <sedji.gaouaou@atmel.com>

 *

 *  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.

 *

 */

#include <linux/of.h>

#include <linux/export.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/platform_device.h>

#include <linux/device.h>



#include <sound/soc.h>

#include <sound/soc-dai.h>

#include <sound/soc-dapm.h>



#include "../codecs/wm8731.h"

#include "atmel_ssc_dai.h"





#define MCLK_RATE 12288000



#define DRV_NAME "sam9x5-snd-wm8731"



struct sam9x5_drvdata {

	int ssc_id;

};



/*

 * Logic for a wm8731 as connected on a at91sam9x5ek based board.

 */

static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)

{

	struct snd_soc_dai *codec_dai = rtd->codec_dai;

	struct device *dev = rtd->dev;

	int ret;



	dev_dbg(dev, "ASoC: %s called\n", __func__);



	/* set the codec system clock for DAC and ADC */

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,

				     MCLK_RATE, SND_SOC_CLOCK_IN);

	if (ret < 0) {

		dev_err(dev, "ASoC: Failed to set WM8731 SYSCLK: %d\n", ret);

		return ret;

	}



	return 0;

}



/*

 * Audio paths on at91sam9x5ek board:

 *

 *  |A| ------------> |      | ---R----> Headphone Jack

 *  |T| <----\        |  WM  | ---L--/

 *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack

 *  |1| <------------ |      | <--L--/

 */

static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {

	SND_SOC_DAPM_HP("Headphone Jack", NULL),

	SND_SOC_DAPM_LINE("Line In Jack", NULL),

};



static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)

{

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

	struct device_node *codec_np, *cpu_np;

	struct snd_soc_card *card;

	struct snd_soc_dai_link *dai;

	struct sam9x5_drvdata *priv;

	int ret;



	if (!np) {

		dev_err(&pdev->dev, "No device node supplied\n");

		return -EINVAL;

	}



	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);

	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);

	if (!dai || !card || !priv) {

		ret = -ENOMEM;

		goto out;

	}



	card->dev = &pdev->dev;

	card->owner = THIS_MODULE;

	card->dai_link = dai;

	card->num_links = 1;

	card->dapm_widgets = sam9x5_dapm_widgets;

	card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);

	dai->name = "WM8731";

	dai->stream_name = "WM8731 PCM";

	dai->codec_dai_name = "wm8731-hifi";

	dai->init = sam9x5_wm8731_init;

	dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF

		| SND_SOC_DAIFMT_CBM_CFM;



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

	if (ret) {

		dev_err(&pdev->dev, "atmel,model node missing\n");

		goto out;

	}



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

	if (ret) {

		dev_err(&pdev->dev, "atmel,audio-routing node missing\n");

		goto out;

	}



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

	if (!codec_np) {

		dev_err(&pdev->dev, "atmel,audio-codec node missing\n");

		ret = -EINVAL;

		goto out;

	}



	dai->codec_of_node = codec_np;



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

	if (!cpu_np) {

		dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");

		ret = -EINVAL;

		goto out;

	}

	dai->cpu_of_node = cpu_np;

	dai->platform_of_node = cpu_np;



	priv->ssc_id = of_alias_get_id(cpu_np, "ssc");



	ret = atmel_ssc_set_audio(priv->ssc_id);

	if (ret != 0) {

		dev_err(&pdev->dev,

			"ASoC: Failed to set SSC %d for audio: %d\n",

			ret, priv->ssc_id);

		goto out;

	}



	of_node_put(codec_np);

	of_node_put(cpu_np);



	platform_set_drvdata(pdev, card);



	ret = snd_soc_register_card(card);

	if (ret) {

		dev_err(&pdev->dev,

			"ASoC: Platform device allocation failed\n");

		goto out_put_audio;

	}



	dev_dbg(&pdev->dev, "ASoC: %s ok\n", __func__);



	return ret;



out_put_audio:

	atmel_ssc_put_audio(priv->ssc_id);

out:

	return ret;

}



static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)

{

	struct snd_soc_card *card = platform_get_drvdata(pdev);

	struct sam9x5_drvdata *priv = card->drvdata;



	snd_soc_unregister_card(card);

	atmel_ssc_put_audio(priv->ssc_id);



	return 0;

}



static const struct of_device_id sam9x5_wm8731_of_match[] = {

	{ .compatible = "atmel,sam9x5-wm8731-audio", },

	{},

};

MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);



static struct platform_driver sam9x5_wm8731_driver = {

	.driver = {

		.name = DRV_NAME,

		.owner = THIS_MODULE,

		.of_match_table = of_match_ptr(sam9x5_wm8731_of_match),

	},

	.probe = sam9x5_wm8731_driver_probe,

	.remove = sam9x5_wm8731_driver_remove,

};

module_platform_driver(sam9x5_wm8731_driver);



/* Module information */

MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");

MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");

MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:" DRV_NAME);