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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: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Richard Genoud <richard.genoud@gmail.com> [Cherry-pick: fdbcb3c] Signed-off-by: Bo Shen <voice.shen@atmel.com>
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Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt
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* Atmel at91sam9x5ek wm8731 audio complex | ||
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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. | ||
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Available audio endpoints for the audio-routing table: | ||
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Board connectors: | ||
* Headphone Jack | ||
* Line In Jack | ||
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wm8731 pins: | ||
cf Documentation/devicetree/bindings/sound/wm8731.txt | ||
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Example: | ||
sound { | ||
compatible = "atmel,sam9x5-wm8731-audio"; | ||
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atmel,model = "wm8731 @ AT91SAM9X5EK"; | ||
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atmel,audio-routing = | ||
"Headphone Jack", "RHPOUT", | ||
"Headphone Jack", "LHPOUT", | ||
"LLINEIN", "Line In Jack", | ||
"RLINEIN", "Line In Jack"; | ||
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atmel,ssc-controller = <&ssc0>; | ||
atmel,audio-codec = <&wm8731>; | ||
}; |
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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> | ||
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#include <sound/soc.h> | ||
#include <sound/soc-dai.h> | ||
#include <sound/soc-dapm.h> | ||
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#include "../codecs/wm8731.h" | ||
#include "atmel_ssc_dai.h" | ||
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#define MCLK_RATE 12288000 | ||
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#define DRV_NAME "sam9x5-snd-wm8731" | ||
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struct sam9x5_drvdata { | ||
int ssc_id; | ||
}; | ||
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/* | ||
* 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; | ||
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dev_dbg(dev, "ASoC: %s called\n", __func__); | ||
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/* 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; | ||
} | ||
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return 0; | ||
} | ||
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/* | ||
* 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), | ||
}; | ||
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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; | ||
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if (!np) { | ||
dev_err(&pdev->dev, "No device node supplied\n"); | ||
return -EINVAL; | ||
} | ||
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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; | ||
} | ||
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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; | ||
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ret = snd_soc_of_parse_card_name(card, "atmel,model"); | ||
if (ret) { | ||
dev_err(&pdev->dev, "atmel,model node missing\n"); | ||
goto out; | ||
} | ||
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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; | ||
} | ||
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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; | ||
} | ||
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dai->codec_of_node = codec_np; | ||
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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; | ||
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priv->ssc_id = of_alias_get_id(cpu_np, "ssc"); | ||
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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; | ||
} | ||
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of_node_put(codec_np); | ||
of_node_put(cpu_np); | ||
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platform_set_drvdata(pdev, card); | ||
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ret = snd_soc_register_card(card); | ||
if (ret) { | ||
dev_err(&pdev->dev, | ||
"ASoC: Platform device allocation failed\n"); | ||
goto out_put_audio; | ||
} | ||
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dev_dbg(&pdev->dev, "ASoC: %s ok\n", __func__); | ||
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return ret; | ||
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out_put_audio: | ||
atmel_ssc_put_audio(priv->ssc_id); | ||
out: | ||
return ret; | ||
} | ||
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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; | ||
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snd_soc_unregister_card(card); | ||
atmel_ssc_put_audio(priv->ssc_id); | ||
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return 0; | ||
} | ||
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static const struct of_device_id sam9x5_wm8731_of_match[] = { | ||
{ .compatible = "atmel,sam9x5-wm8731-audio", }, | ||
{}, | ||
}; | ||
MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match); | ||
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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); | ||
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/* 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); |