1 /*
2 * SoC audio for EDB93xx
3 *
4 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * This driver support CS4271 codec being master or slave, working
17 * in control port mode, connected either via SPI or I2C.
18 * The data format accepted is I2S or left-justified.
19 * DAPM support not implemented.
20 */
21
22 #include <linux/platform_device.h>
23 #include <linux/gpio.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/soc.h>
27 #include <asm/mach-types.h>
28 #include <mach/hardware.h>
29 #include "ep93xx-pcm.h"
30
31 #define edb93xx_has_audio() (machine_is_edb9301() || \
32 machine_is_edb9302() || \
33 machine_is_edb9302a() || \
34 machine_is_edb9307a() || \
35 machine_is_edb9315a())
36
edb93xx_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)37 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
38 struct snd_pcm_hw_params *params)
39 {
40 struct snd_soc_pcm_runtime *rtd = substream->private_data;
41 struct snd_soc_dai *codec_dai = rtd->codec_dai;
42 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
43 int err;
44 unsigned int mclk_rate;
45 unsigned int rate = params_rate(params);
46
47 /*
48 * According to CS4271 datasheet we use MCLK/LRCK=256 for
49 * rates below 50kHz and 128 for higher sample rates
50 */
51 if (rate < 50000)
52 mclk_rate = rate * 64 * 4;
53 else
54 mclk_rate = rate * 64 * 2;
55
56 err = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
57 SND_SOC_DAIFMT_NB_IF |
58 SND_SOC_DAIFMT_CBS_CFS);
59 if (err)
60 return err;
61
62 err = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
63 SND_SOC_DAIFMT_NB_IF |
64 SND_SOC_DAIFMT_CBS_CFS);
65 if (err)
66 return err;
67
68 err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
69 SND_SOC_CLOCK_IN);
70 if (err)
71 return err;
72
73 return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
74 SND_SOC_CLOCK_OUT);
75 }
76
77 static struct snd_soc_ops edb93xx_ops = {
78 .hw_params = edb93xx_hw_params,
79 };
80
81 static struct snd_soc_dai_link edb93xx_dai = {
82 .name = "CS4271",
83 .stream_name = "CS4271 HiFi",
84 .platform_name = "ep93xx-pcm-audio",
85 .cpu_dai_name = "ep93xx-i2s",
86 .codec_name = "spi0.0",
87 .codec_dai_name = "cs4271-hifi",
88 .ops = &edb93xx_ops,
89 };
90
91 static struct snd_soc_card snd_soc_edb93xx = {
92 .name = "EDB93XX",
93 .dai_link = &edb93xx_dai,
94 .num_links = 1,
95 };
96
97 static struct platform_device *edb93xx_snd_device;
98
edb93xx_init(void)99 static int __init edb93xx_init(void)
100 {
101 int ret;
102
103 if (!edb93xx_has_audio())
104 return -ENODEV;
105
106 ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
107 EP93XX_SYSCON_I2SCLKDIV_ORIDE |
108 EP93XX_SYSCON_I2SCLKDIV_SPOL);
109 if (ret)
110 return ret;
111
112 edb93xx_snd_device = platform_device_alloc("soc-audio", -1);
113 if (!edb93xx_snd_device) {
114 ret = -ENOMEM;
115 goto free_i2s;
116 }
117
118 platform_set_drvdata(edb93xx_snd_device, &snd_soc_edb93xx);
119 ret = platform_device_add(edb93xx_snd_device);
120 if (ret)
121 goto device_put;
122
123 return 0;
124
125 device_put:
126 platform_device_put(edb93xx_snd_device);
127 free_i2s:
128 ep93xx_i2s_release();
129 return ret;
130 }
131 module_init(edb93xx_init);
132
edb93xx_exit(void)133 static void __exit edb93xx_exit(void)
134 {
135 platform_device_unregister(edb93xx_snd_device);
136 ep93xx_i2s_release();
137 }
138 module_exit(edb93xx_exit);
139
140 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
141 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
142 MODULE_LICENSE("GPL");
143