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
|
/*
* SoC audio for EDB93xx
*
* Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This driver support CS4271 codec being master or slave, working
* in control port mode, connected either via SPI or I2C.
* The data format accepted is I2S or left-justified.
* DAPM support not implemented.
*/
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include "ep93xx-pcm.h"
static int edb93xx_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;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int err;
unsigned int mclk_rate;
unsigned int rate = params_rate(params);
/*
* According to CS4271 datasheet we use MCLK/LRCK=256 for
* rates below 50kHz and 128 for higher sample rates
*/
if (rate < 50000)
mclk_rate = rate * 64 * 4;
else
mclk_rate = rate * 64 * 2;
err = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_IF |
SND_SOC_DAIFMT_CBS_CFS);
if (err)
return err;
err = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_IF |
SND_SOC_DAIFMT_CBS_CFS);
if (err)
return err;
err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
SND_SOC_CLOCK_IN);
if (err)
return err;
return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
SND_SOC_CLOCK_OUT);
}
static struct snd_soc_ops edb93xx_ops = {
.hw_params = edb93xx_hw_params,
};
static struct snd_soc_dai_link edb93xx_dai = {
.name = "CS4271",
.stream_name = "CS4271 HiFi",
.platform_name = "ep93xx-pcm-audio",
.cpu_dai_name = "ep93xx-i2s",
.codec_name = "spi0.0",
.codec_dai_name = "cs4271-hifi",
.ops = &edb93xx_ops,
};
static struct snd_soc_card snd_soc_edb93xx = {
.name = "EDB93XX",
.dai_link = &edb93xx_dai,
.num_links = 1,
};
static int __devinit edb93xx_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = &snd_soc_edb93xx;
int ret;
ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
EP93XX_SYSCON_I2SCLKDIV_ORIDE |
EP93XX_SYSCON_I2SCLKDIV_SPOL);
if (ret)
return ret;
card->dev = &pdev->dev;
ret = snd_soc_register_card(card);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
ret);
ep93xx_i2s_release();
}
return ret;
}
static int __devexit edb93xx_remove(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
snd_soc_unregister_card(card);
ep93xx_i2s_release();
return 0;
}
static struct platform_driver edb93xx_driver = {
.driver = {
.name = "edb93xx-audio",
.owner = THIS_MODULE,
},
.probe = edb93xx_probe,
.remove = __devexit_p(edb93xx_remove),
};
module_platform_driver(edb93xx_driver);
MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
MODULE_DESCRIPTION("ALSA SoC EDB93xx");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:edb93xx-audio");
|
