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
  10 static int imote2_asoc_hw_params(struct snd_pcm_substream *substream,
  11                                  struct snd_pcm_hw_params *params)
  12 {
  13         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  14         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  15         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  16         unsigned int clk = 0;
  17         int ret;
  18
  19         switch (params_rate(params)) {
  20         case 8000:
  21         case 16000:
  22         case 48000:
  23         case 96000:
  24                 clk = 12288000;
  25                 break;
  26         case 11025:
  27         case 22050:
  28         case 44100:
  29                 clk = 11289600;
  30                 break;
  31         }
  32
  33         /* set codec DAI configuration */
  34         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S
  35                                   | SND_SOC_DAIFMT_NB_NF
  36                                   | SND_SOC_DAIFMT_CBS_CFS);
  37         if (ret < 0)
  38                 return ret;
  39
  40         /* CPU should be clock master */
  41         ret = snd_soc_dai_set_fmt(cpu_dai,  SND_SOC_DAIFMT_I2S
  42                                   | SND_SOC_DAIFMT_NB_NF
  43                                   | SND_SOC_DAIFMT_CBS_CFS);
  44         if (ret < 0)
  45                 return ret;
  46
  47         ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
  48                                      SND_SOC_CLOCK_IN);
  49         if (ret < 0)
  50                 return ret;
  51
  52         /* set the I2S system clock as input (unused) */
  53         ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, clk,
  54                 SND_SOC_CLOCK_OUT);
  55
  56         return ret;
  57 }
  58
  59 static struct snd_soc_ops imote2_asoc_ops = {
  60         .hw_params = imote2_asoc_hw_params,
  61 };
  62
  63 static struct snd_soc_dai_link imote2_dai = {
  64         .name = "WM8940",
  65         .stream_name = "WM8940",
  66         .cpu_dai_name = "pxa2xx-i2s",
  67         .codec_dai_name = "wm8940-hifi",
  68         .platform_name = "pxa-pcm-audio",
  69         .codec_name = "wm8940-codec.0-0034",
  70         .ops = &imote2_asoc_ops,
  71 };
  72
  73 static struct snd_soc_card snd_soc_imote2 = {
  74         .name = "Imote2",
  75         .dai_link = &imote2_dai,
  76         .num_links = 1,
  77 };
  78
  79 static struct platform_device *imote2_snd_device;
  80
  81 static int __init imote2_asoc_init(void)
  82 {
  83         int ret;
  84
  85         if (!machine_is_intelmote2())
  86                 return -ENODEV;
  87         imote2_snd_device = platform_device_alloc("soc-audio", -1);
  88         if (!imote2_snd_device)
  89                 return -ENOMEM;
  90
  91         platform_set_drvdata(imote2_snd_device, &snd_soc_imote2);
  92         ret = platform_device_add(imote2_snd_device);
  93         if (ret)
  94                 platform_device_put(imote2_snd_device);
  95
  96         return ret;
  97 }
  98 module_init(imote2_asoc_init);
  99
 100 static void __exit imote2_asoc_exit(void)
 101 {
 102         platform_device_unregister(imote2_snd_device);
 103 }
 104 module_exit(imote2_asoc_exit);
 105
 106 MODULE_AUTHOR("Jonathan Cameron");
 107 MODULE_DESCRIPTION("ALSA SoC Imote 2");
 108 MODULE_LICENSE("GPL");