[mirror_ubuntu-zesty-kernel.git] / sound / soc / bcm / rpi-proto.c

/*
 * ASoC driver for PROTO AudioCODEC (with a WM8731)
 * connected to a Raspberry Pi
 *
 * 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"

static const unsigned int wm8731_rates_12288000[] = {
	8000, 32000, 48000, 96000,
};

static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
	.list = wm8731_rates_12288000,
	.count = ARRAY_SIZE(wm8731_rates_12288000),
};

static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
{
	/* Setup constraints, because there is a 12.288 MHz XTAL on the board */
	snd_pcm_hw_constraint_list(substream->runtime, 0,
				SNDRV_PCM_HW_PARAM_RATE,
				&wm8731_constraints_12288000);
	return 0;
}

static int snd_rpi_proto_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_codec *codec = rtd->codec;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int sysclk = 12288000; /* This is fixed on this board */

	/* Set proto bclk */
	int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
	if (ret < 0){
		dev_err(codec->dev,
				"Failed to set BCLK ratio %d\n", ret);
		return ret;
	}

	/* Set proto sysclk */
	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
			sysclk, SND_SOC_CLOCK_IN);
	if (ret < 0) {
		dev_err(codec->dev,
				"Failed to set WM8731 SYSCLK: %d\n", ret);
		return ret;
	}

	return 0;
}

/* machine stream operations */
static struct snd_soc_ops snd_rpi_proto_ops = {
	.startup = snd_rpi_proto_startup,
	.hw_params = snd_rpi_proto_hw_params,
};

static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
{
	.name		= "WM8731",
	.stream_name	= "WM8731 HiFi",
	.cpu_dai_name	= "bcm2708-i2s.0",
	.codec_dai_name	= "wm8731-hifi",
	.platform_name	= "bcm2708-i2s.0",
	.codec_name	= "wm8731.1-001a",
	.dai_fmt	= SND_SOC_DAIFMT_I2S
				| SND_SOC_DAIFMT_NB_NF
				| SND_SOC_DAIFMT_CBM_CFM,
	.ops		= &snd_rpi_proto_ops,
},
};

/* audio machine driver */
static struct snd_soc_card snd_rpi_proto = {
	.name		= "snd_rpi_proto",
	.owner		= THIS_MODULE,
	.dai_link	= snd_rpi_proto_dai,
	.num_links	= ARRAY_SIZE(snd_rpi_proto_dai),
};

static int snd_rpi_proto_probe(struct platform_device *pdev)
{
	int ret = 0;

	snd_rpi_proto.dev = &pdev->dev;

	if (pdev->dev.of_node) {
		struct device_node *i2s_node;
		struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
		i2s_node = of_parse_phandle(pdev->dev.of_node,
				            "i2s-controller", 0);

		if (i2s_node) {
			dai->cpu_dai_name = NULL;
			dai->cpu_of_node = i2s_node;
			dai->platform_name = NULL;
			dai->platform_of_node = i2s_node;
		}
	}

	ret = snd_soc_register_card(&snd_rpi_proto);
	if (ret && ret != -EPROBE_DEFER)
		dev_err(&pdev->dev,
				"snd_soc_register_card() failed: %d\n", ret);

	return ret;
}


static int snd_rpi_proto_remove(struct platform_device *pdev)
{
	return snd_soc_unregister_card(&snd_rpi_proto);
}

static const struct of_device_id snd_rpi_proto_of_match[] = {
	{ .compatible = "rpi,rpi-proto", },
	{},
};
MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);

static struct platform_driver snd_rpi_proto_driver = {
	.driver = {
		.name   = "snd-rpi-proto",
		.owner  = THIS_MODULE,
		.of_match_table = snd_rpi_proto_of_match,
	},
	.probe	  = snd_rpi_proto_probe,
	.remove	 = snd_rpi_proto_remove,
};

module_platform_driver(snd_rpi_proto_driver);

MODULE_AUTHOR("Florian Meier");
MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
MODULE_LICENSE("GPL");
Commit	Line	Data
48cd6b5d WB	1	/*
	2	* ASoC driver for PROTO AudioCODEC (with a WM8731)
	3	* connected to a Raspberry Pi
	4	*
	5	* Author: Florian Meier, <koalo@koalo.de>
	6	* Copyright 2013
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15
	16	#include <sound/core.h>
	17	#include <sound/pcm.h>
	18	#include <sound/soc.h>
	19	#include <sound/jack.h>
	20
	21	#include "../codecs/wm8731.h"
	22
	23	static const unsigned int wm8731_rates_12288000[] = {
	24	8000, 32000, 48000, 96000,
	25	};
	26
	27	static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
	28	.list = wm8731_rates_12288000,
	29	.count = ARRAY_SIZE(wm8731_rates_12288000),
	30	};
	31
	32	static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
	33	{
	34	/* Setup constraints, because there is a 12.288 MHz XTAL on the board */
	35	snd_pcm_hw_constraint_list(substream->runtime, 0,
	36	SNDRV_PCM_HW_PARAM_RATE,
	37	&wm8731_constraints_12288000);
	38	return 0;
	39	}
	40
	41	static int snd_rpi_proto_hw_params(struct snd_pcm_substream *substream,
	42	struct snd_pcm_hw_params *params)
	43	{
	44	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	45	struct snd_soc_codec *codec = rtd->codec;
	46	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	47	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	48	int sysclk = 12288000; /* This is fixed on this board */
	49
	50	/* Set proto bclk */
	51	int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
	52	if (ret < 0){
	53	dev_err(codec->dev,
	54	"Failed to set BCLK ratio %d\n", ret);
	55	return ret;
	56	}
	57
	58	/* Set proto sysclk */
	59	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
	60	sysclk, SND_SOC_CLOCK_IN);
	61	if (ret < 0) {
	62	dev_err(codec->dev,
	63	"Failed to set WM8731 SYSCLK: %d\n", ret);
	64	return ret;
65	}
66
67	return 0;
68	}
69
70	/* machine stream operations */
71	static struct snd_soc_ops snd_rpi_proto_ops = {
72	.startup = snd_rpi_proto_startup,
73	.hw_params = snd_rpi_proto_hw_params,
74	};
75
76	static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
77	{
78	.name = "WM8731",
79	.stream_name = "WM8731 HiFi",
80	.cpu_dai_name = "bcm2708-i2s.0",
81	.codec_dai_name = "wm8731-hifi",
82	.platform_name = "bcm2708-i2s.0",
83	.codec_name = "wm8731.1-001a",
84	.dai_fmt = SND_SOC_DAIFMT_I2S
85	\| SND_SOC_DAIFMT_NB_NF
86	\| SND_SOC_DAIFMT_CBM_CFM,
87	.ops = &snd_rpi_proto_ops,
88	},
89	};
90
91	/* audio machine driver */
92	static struct snd_soc_card snd_rpi_proto = {
93	.name = "snd_rpi_proto",
94	.owner = THIS_MODULE,
95	.dai_link = snd_rpi_proto_dai,
96	.num_links = ARRAY_SIZE(snd_rpi_proto_dai),
97	};
98
99	static int snd_rpi_proto_probe(struct platform_device *pdev)
100	{
101	int ret = 0;
102
103	snd_rpi_proto.dev = &pdev->dev;
104
105	if (pdev->dev.of_node) {
106	struct device_node *i2s_node;
107	struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
108	i2s_node = of_parse_phandle(pdev->dev.of_node,
109	"i2s-controller", 0);
110
111	if (i2s_node) {
112	dai->cpu_dai_name = NULL;
113	dai->cpu_of_node = i2s_node;
114	dai->platform_name = NULL;
115	dai->platform_of_node = i2s_node;
116	}
117	}
118
119	ret = snd_soc_register_card(&snd_rpi_proto);
49dbf1af	120	if (ret && ret != -EPROBE_DEFER)
48cd6b5d WB	121	dev_err(&pdev->dev,
48cd6b5d WB	122	"snd_soc_register_card() failed: %d\n", ret);
48cd6b5d WB	123
	124	return ret;
	125	}
	126
	127
	128	static int snd_rpi_proto_remove(struct platform_device *pdev)
	129	{
	130	return snd_soc_unregister_card(&snd_rpi_proto);
	131	}
	132
	133	static const struct of_device_id snd_rpi_proto_of_match[] = {
	134	{ .compatible = "rpi,rpi-proto", },
	135	{},
	136	};
	137	MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);
	138
	139	static struct platform_driver snd_rpi_proto_driver = {
	140	.driver = {
	141	.name = "snd-rpi-proto",
	142	.owner = THIS_MODULE,
	143	.of_match_table = snd_rpi_proto_of_match,
	144	},
	145	.probe = snd_rpi_proto_probe,
	146	.remove = snd_rpi_proto_remove,
	147	};
	148
	149	module_platform_driver(snd_rpi_proto_driver);
	150
	151	MODULE_AUTHOR("Florian Meier");
	152	MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
	153	MODULE_LICENSE("GPL");