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
= {
79 .dai_link
= &edb93xx_dai
,
83 static int __devinit
edb93xx_probe(struct platform_device
*pdev
)
85 struct snd_soc_card
*card
= &snd_soc_edb93xx
;
88 ret
= ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97
,
89 EP93XX_SYSCON_I2SCLKDIV_ORIDE
|
90 EP93XX_SYSCON_I2SCLKDIV_SPOL
);
94 card
->dev
= &pdev
->dev
;
96 ret
= snd_soc_register_card(card
);
98 dev_err(&pdev
->dev
, "snd_soc_register_card() failed: %d\n",
100 ep93xx_i2s_release();
106 static int __devexit
edb93xx_remove(struct platform_device
*pdev
)
108 struct snd_soc_card
*card
= platform_get_drvdata(pdev
);
110 snd_soc_unregister_card(card
);
111 ep93xx_i2s_release();
116 static struct platform_driver edb93xx_driver
= {
118 .name
= "edb93xx-audio",
119 .owner
= THIS_MODULE
,
121 .probe
= edb93xx_probe
,
122 .remove
= __devexit_p(edb93xx_remove
),
125 module_platform_driver(edb93xx_driver
);
127 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
128 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
129 MODULE_LICENSE("GPL");
130 MODULE_ALIAS("platform:edb93xx-audio");