summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/pcm3008.c
blob: f7316519432c42dcdb6122bd17009672217ad72f (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
/*
 * ALSA Soc PCM3008 codec support
 *
 * Author:	Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on AC97 Soc codec, original copyright follow:
 * Copyright 2005 Wolfson Microelectronics PLC.
 *
 *  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.
 *
 * Generic PCM3008 support.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "pcm3008.h"

#define PCM3008_VERSION "0.2"

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |	\
		       SNDRV_PCM_RATE_48000)

static struct snd_soc_dai_driver pcm3008_dai = {
	.name = "pcm3008-hifi",
	.playback = {
		.stream_name = "PCM3008 Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = PCM3008_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "PCM3008 Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = PCM3008_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
{
	gpio_free(setup->dem0_pin);
	gpio_free(setup->dem1_pin);
	gpio_free(setup->pdad_pin);
	gpio_free(setup->pdda_pin);
}

static int pcm3008_soc_probe(struct snd_soc_codec *codec)
{
	struct pcm3008_setup_data *setup = codec->dev->platform_data;
	int ret = 0;

	printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);

	/* DEM1  DEM0  DE-EMPHASIS_MODE
	 * Low   Low   De-emphasis 44.1 kHz ON
	 * Low   High  De-emphasis OFF
	 * High  Low   De-emphasis 48 kHz ON
	 * High  High  De-emphasis 32 kHz ON
	 */

	/* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
	ret = gpio_request(setup->dem0_pin, "codec_dem0");
	if (ret == 0)
		ret = gpio_direction_output(setup->dem0_pin, 1);
	if (ret != 0)
		goto gpio_err;

	/* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
	ret = gpio_request(setup->dem1_pin, "codec_dem1");
	if (ret == 0)
		ret = gpio_direction_output(setup->dem1_pin, 0);
	if (ret != 0)
		goto gpio_err;

	/* Configure PDAD GPIO. */
	ret = gpio_request(setup->pdad_pin, "codec_pdad");
	if (ret == 0)
		ret = gpio_direction_output(setup->pdad_pin, 1);
	if (ret != 0)
		goto gpio_err;

	/* Configure PDDA GPIO. */
	ret = gpio_request(setup->pdda_pin, "codec_pdda");
	if (ret == 0)
		ret = gpio_direction_output(setup->pdda_pin, 1);
	if (ret != 0)
		goto gpio_err;

	return ret;

gpio_err:
	pcm3008_gpio_free(setup);

	return ret;
}

static int pcm3008_soc_remove(struct snd_soc_codec *codec)
{
	struct pcm3008_setup_data *setup = codec->dev->platform_data;

	pcm3008_gpio_free(setup);
	return 0;
}

#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
{
	struct pcm3008_setup_data *setup = codec->dev->platform_data;

	gpio_set_value(setup->pdad_pin, 0);
	gpio_set_value(setup->pdda_pin, 0);

	return 0;
}

static int pcm3008_soc_resume(struct snd_soc_codec *codec)
{
	struct pcm3008_setup_data *setup = codec->dev->platform_data;

	gpio_set_value(setup->pdad_pin, 1);
	gpio_set_value(setup->pdda_pin, 1);

	return 0;
}
#else
#define pcm3008_soc_suspend NULL
#define pcm3008_soc_resume NULL
#endif

static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
	.probe = 	pcm3008_soc_probe,
	.remove = 	pcm3008_soc_remove,
	.suspend =	pcm3008_soc_suspend,
	.resume =	pcm3008_soc_resume,
};

static int __devinit pcm3008_codec_probe(struct platform_device *pdev)
{
	return snd_soc_register_codec(&pdev->dev,
			&soc_codec_dev_pcm3008, &pcm3008_dai, 1);
}

static int __devexit pcm3008_codec_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

MODULE_ALIAS("platform:pcm3008-codec");

static struct platform_driver pcm3008_codec_driver = {
	.probe		= pcm3008_codec_probe,
	.remove		= __devexit_p(pcm3008_codec_remove),
	.driver		= {
		.name	= "pcm3008-codec",
		.owner	= THIS_MODULE,
	},
};

static int __init pcm3008_modinit(void)
{
	return platform_driver_register(&pcm3008_codec_driver);
}
module_init(pcm3008_modinit);

static void __exit pcm3008_exit(void)
{
	platform_driver_unregister(&pcm3008_codec_driver);
}
module_exit(pcm3008_exit);

MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud