LXR linux/sound/soc/pxa/imote2.c

   1
   2#include <linux/module.h>
   3#include <sound/soc.h>
   4
   5#include <asm/mach-types.h>
   6
   7#include "../codecs/wm8940.h"
   8#include "pxa2xx-i2s.h"
   9#include "pxa2xx-pcm.h"
  10
  11static int imote2_asoc_hw_params(struct snd_pcm_substream *substream,
  12                                 struct snd_pcm_hw_params *params)
  13{
  14        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  15        struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
  16        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  17        unsigned int clk = 0;
  18        int ret;
  19
  20        switch (params_rate(params)) {
  21        case 8000:
  22        case 16000:
  23        case 48000:
  24        case 96000:
  25                clk = 12288000;
  26                break;
  27        case 11025:
  28        case 22050:
  29        case 44100:
  30                clk = 11289600;
  31                break;
  32        }
  33
  34        /* set codec DAI configuration */
  35        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S
  36                                  | SND_SOC_DAIFMT_NB_NF
  37                                  | SND_SOC_DAIFMT_CBS_CFS);
  38        if (ret < 0)
  39                return ret;
  40
  41        /* CPU should be clock master */
  42        ret = snd_soc_dai_set_fmt(cpu_dai,  SND_SOC_DAIFMT_I2S
  43                                  | SND_SOC_DAIFMT_NB_NF
  44                                  | SND_SOC_DAIFMT_CBS_CFS);
  45        if (ret < 0)
  46                return ret;
  47
  48        ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
  49                                     SND_SOC_CLOCK_IN);
  50        if (ret < 0)
  51                return ret;
  52
  53        /* set the I2S system clock as input (unused) */
  54        ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, clk,
  55                SND_SOC_CLOCK_OUT);
  56
  57        return ret;
  58}
  59
  60static struct snd_soc_ops imote2_asoc_ops = {
  61        .hw_params = imote2_asoc_hw_params,
  62};
  63
  64static struct snd_soc_dai_link imote2_dai = {
  65        .name = "WM8940",
  66        .stream_name = "WM8940",
  67        .cpu_dai = &pxa_i2s_dai,
  68        .codec_dai = &wm8940_dai,
  69        .ops = &imote2_asoc_ops,
  70};
  71
  72static struct snd_soc_card snd_soc_imote2 = {
  73        .name = "Imote2",
  74        .platform = &pxa2xx_soc_platform,
  75        .dai_link = &imote2_dai,
  76        .num_links = 1,
  77};
  78
  79static struct snd_soc_device imote2_snd_devdata = {
  80        .card = &snd_soc_imote2,
  81        .codec_dev = &soc_codec_dev_wm8940,
  82};
  83
  84static struct platform_device *imote2_snd_device;
  85
  86static int __init imote2_asoc_init(void)
  87{
  88        int ret;
  89
  90        if (!machine_is_intelmote2())
  91                return -ENODEV;
  92        imote2_snd_device = platform_device_alloc("soc-audio", -1);
  93        if (!imote2_snd_device)
  94                return -ENOMEM;
  95
  96        platform_set_drvdata(imote2_snd_device, &imote2_snd_devdata);
  97        imote2_snd_devdata.dev = &imote2_snd_device->dev;
  98        ret = platform_device_add(imote2_snd_device);
  99        if (ret)
 100                platform_device_put(imote2_snd_device);
 101
 102        return ret;
 103}
 104module_init(imote2_asoc_init);
 105
 106static void __exit imote2_asoc_exit(void)
 107{
 108        platform_device_unregister(imote2_snd_device);
 109}
 110module_exit(imote2_asoc_exit);
 111
 112MODULE_AUTHOR("Jonathan Cameron");
 113MODULE_DESCRIPTION("ALSA SoC Imote 2");
 114MODULE_LICENSE("GPL");
 115