2 * SoC audio for EDB93xx
4 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
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.
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.
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.
22 #include <linux/platform_device.h>
23 #include <linux/gpio.h>
24 #include <linux/module.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/soc.h>
28 #include <asm/mach-types.h>
29 #include <mach/hardware.h>
30 #include "ep93xx-pcm.h"
32 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
33 struct snd_pcm_hw_params *params)
35 struct snd_soc_pcm_runtime *rtd = substream->private_data;
36 struct snd_soc_dai *codec_dai = rtd->codec_dai;
37 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
39 unsigned int mclk_rate;
40 unsigned int rate = params_rate(params);
43 * According to CS4271 datasheet we use MCLK/LRCK=256 for
44 * rates below 50kHz and 128 for higher sample rates
47 mclk_rate = rate * 64 * 4;
49 mclk_rate = rate * 64 * 2;
51 err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
56 return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
60 static struct snd_soc_ops edb93xx_ops = {
61 .hw_params = edb93xx_hw_params,
64 static struct snd_soc_dai_link edb93xx_dai = {
66 .stream_name = "CS4271 HiFi",
67 .platform_name = "ep93xx-pcm-audio",
68 .cpu_dai_name = "ep93xx-i2s",
69 .codec_name = "spi0.0",
70 .codec_dai_name = "cs4271-hifi",
71 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
72 SND_SOC_DAIFMT_CBS_CFS,
76 static struct snd_soc_card snd_soc_edb93xx = {
78 .dai_link = &edb93xx_dai,
82 static int __devinit edb93xx_probe(struct platform_device *pdev)
84 struct snd_soc_card *card = &snd_soc_edb93xx;
87 ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
88 EP93XX_SYSCON_I2SCLKDIV_ORIDE |
89 EP93XX_SYSCON_I2SCLKDIV_SPOL);
93 card->dev = &pdev->dev;
95 ret = snd_soc_register_card(card);
97 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
105 static int __devexit edb93xx_remove(struct platform_device *pdev)
107 struct snd_soc_card *card = platform_get_drvdata(pdev);
109 snd_soc_unregister_card(card);
110 ep93xx_i2s_release();
115 static struct platform_driver edb93xx_driver = {
117 .name = "edb93xx-audio",
118 .owner = THIS_MODULE,
120 .probe = edb93xx_probe,
121 .remove = __devexit_p(edb93xx_remove),
124 module_platform_driver(edb93xx_driver);
126 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
127 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
128 MODULE_LICENSE("GPL");
129 MODULE_ALIAS("platform:edb93xx-audio");