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86c33041 AS |
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 | ||
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 rate = params_rate(params); | |
45 | /* | |
46 | * We set LRCLK equal to `rate' and SCLK = LRCLK * 64, | |
47 | * because our sample size is 32 bit * 2 channels. | |
48 | * I2S standard permits us to transmit more bits than | |
49 | * the codec uses. | |
50 | * MCLK = SCLK * 4 is the best recommended value, | |
51 | * but we have to fall back to ratio 2 for higher | |
52 | * sample rates. | |
53 | */ | |
54 | unsigned int mclk_rate = rate * 64 * ((rate <= 48000) ? 4 : 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 | ||
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 | ||
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"); |