aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/atmel/sam9x5_wm8731.c
blob: 1b372283bd01a947c26dc4da302f9b077adfe74a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
/*
 * 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;
	}

	snd_soc_card_set_drvdata(card, priv);

	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);