release/src-rt-6.x.4708/linux/linux-2.6.36/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
  11 static 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
  60 static struct snd_soc_ops imote2_asoc_ops = {
  61         .hw_params = imote2_asoc_hw_params,
  62 };
  63
  64 static 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
  72 static 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
  79 static struct snd_soc_device imote2_snd_devdata = {
  80         .card = &snd_soc_imote2,
  81         .codec_dev = &soc_codec_dev_wm8940,
  82 };
  83
  84 static struct platform_device *imote2_snd_device;
  85
  86 static 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 }
 104 module_init(imote2_asoc_init);
 105
 106 static void __exit imote2_asoc_exit(void)
 107 {
 108         platform_device_unregister(imote2_snd_device);
 109 }
 110 module_exit(imote2_asoc_exit);
 111
 112 MODULE_AUTHOR("Jonathan Cameron");
 113 MODULE_DESCRIPTION("ALSA SoC Imote 2");
 114 MODULE_LICENSE("GPL");