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/*
* ASoC driver for PROTO AudioCODEC (with a WM8731)
*
* Author: Florian Meier, <koalo@koalo.de>
* Copyright 2013
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/jack.h>
#include "../codecs/wm8731.h"
#define XTAL_RATE 12288000 /* This is fixed on this board */
static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_card *card = rtd->card;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
/* Set proto sysclk */
int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
XTAL_RATE, SND_SOC_CLOCK_IN);
if (ret < 0) {
dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
ret);
return ret;
}
return 0;
}
static const struct snd_soc_dapm_widget snd_proto_widget[] = {
SND_SOC_DAPM_MIC("Microphone Jack", NULL),
SND_SOC_DAPM_HP("Headphone Jack", NULL),
};
static const struct snd_soc_dapm_route snd_proto_route[] = {
/* speaker connected to LHPOUT/RHPOUT */
{"Headphone Jack", NULL, "LHPOUT"},
{"Headphone Jack", NULL, "RHPOUT"},
/* mic is connected to Mic Jack, with WM8731 Mic Bias */
{"MICIN", NULL, "Mic Bias"},
{"Mic Bias", NULL, "Microphone Jack"},
};
/* audio machine driver */
static struct snd_soc_card snd_proto = {
.name = "snd_mikroe_proto",
.owner = THIS_MODULE,
.dapm_widgets = snd_proto_widget,
.num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
.dapm_routes = snd_proto_route,
.num_dapm_routes = ARRAY_SIZE(snd_proto_route),
};
static int snd_proto_probe(struct platform_device *pdev)
{
struct snd_soc_dai_link *dai;
struct device_node *np = pdev->dev.of_node;
struct device_node *codec_np, *cpu_np;
struct device_node *bitclkmaster = NULL;
struct device_node *framemaster = NULL;
unsigned int dai_fmt;
int ret = 0;
if (!np) {
dev_err(&pdev->dev, "No device node supplied\n");
return -EINVAL;
}
snd_proto.dev = &pdev->dev;
ret = snd_soc_of_parse_card_name(&snd_proto, "model");
if (ret)
return ret;
dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
if (!dai)
return -ENOMEM;
snd_proto.dai_link = dai;
snd_proto.num_links = 1;
dai->name = "WM8731";
dai->stream_name = "WM8731 HiFi";
dai->codec_dai_name = "wm8731-hifi";
dai->init = &snd_proto_init;
codec_np = of_parse_phandle(np, "audio-codec", 0);
if (!codec_np) {
dev_err(&pdev->dev, "audio-codec node missing\n");
return -EINVAL;
}
dai->codec_of_node = codec_np;
cpu_np = of_parse_phandle(np, "i2s-controller", 0);
if (!cpu_np) {
dev_err(&pdev->dev, "i2s-controller missing\n");
return -EINVAL;
}
dai->cpu_of_node = cpu_np;
dai->platform_of_node = cpu_np;
dai_fmt = snd_soc_of_parse_daifmt(np, NULL,
&bitclkmaster, &framemaster);
if (bitclkmaster != framemaster) {
dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
return -EINVAL;
}
if (bitclkmaster) {
dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
if (codec_np == bitclkmaster)
dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
else
dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
}
of_node_put(bitclkmaster);
of_node_put(framemaster);
dai->dai_fmt = dai_fmt;
of_node_put(codec_np);
of_node_put(cpu_np);
ret = snd_soc_register_card(&snd_proto);
if (ret && ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"snd_soc_register_card() failed: %d\n", ret);
return ret;
}
static int snd_proto_remove(struct platform_device *pdev)
{
return snd_soc_unregister_card(&snd_proto);
}
static const struct of_device_id snd_proto_of_match[] = {
{ .compatible = "mikroe,mikroe-proto", },
{},
};
MODULE_DEVICE_TABLE(of, snd_proto_of_match);
static struct platform_driver snd_proto_driver = {
.driver = {
.name = "snd-mikroe-proto",
.of_match_table = snd_proto_of_match,
},
.probe = snd_proto_probe,
.remove = snd_proto_remove,
};
module_platform_driver(snd_proto_driver);
MODULE_AUTHOR("Florian Meier");
MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
MODULE_LICENSE("GPL");
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