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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 <sound/soc.h>
#include "../codecs/wm8904.h"
#include "atmel_ssc_dai.h"
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 const struct snd_soc_ops atmel_asoc_wm8904_ops = {
.hw_params = atmel_asoc_wm8904_hw_params,
};
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,
.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;
int id, ret;
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;
}
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", },
{ }
};
MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
#endif
static struct platform_driver atmel_asoc_wm8904_driver = {
.driver = {
.name = "atmel-wm8904-audio",
.of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
.pm = &snd_soc_pm_ops,
},
.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");
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