kernel/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         ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
  34                                      SND_SOC_CLOCK_IN);
  35         if (ret < 0)
  36                 return ret;
  37
  38         /* set the I2S system clock as input (unused) */
  39         ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, clk,
  40                 SND_SOC_CLOCK_OUT);
  41
  42         return ret;
  43 }
  44
  45 static struct snd_soc_ops imote2_asoc_ops = {
  46         .hw_params = imote2_asoc_hw_params,
  47 };
  48
  49 static struct snd_soc_dai_link imote2_dai = {
  50         .name = "WM8940",
  51         .stream_name = "WM8940",
  52         .cpu_dai_name = "pxa2xx-i2s",
  53         .codec_dai_name = "wm8940-hifi",
  54         .platform_name = "pxa-pcm-audio",
  55         .codec_name = "wm8940-codec.0-0034",
  56         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  57                    SND_SOC_DAIFMT_CBS_CFS,
  58         .ops = &imote2_asoc_ops,
  59 };
  60
  61 static struct snd_soc_card imote2 = {
  62         .name = "Imote2",
  63         .owner = THIS_MODULE,
  64         .dai_link = &imote2_dai,
  65         .num_links = 1,
  66 };
  67
  68 static int imote2_probe(struct platform_device *pdev)
  69 {
  70         struct snd_soc_card *card = &imote2;
  71         int ret;
  72
  73         card->dev = &pdev->dev;
  74
  75         ret = devm_snd_soc_register_card(&pdev->dev, card);
  76         if (ret)
  77                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  78                         ret);
  79         return ret;
  80 }
  81
  82 static struct platform_driver imote2_driver = {
  83         .driver         = {
  84                 .name   = "imote2-audio",
  85                 .pm     = &snd_soc_pm_ops,
  86         },
  87         .probe          = imote2_probe,
  88 };
  89
  90 module_platform_driver(imote2_driver);
  91
  92 MODULE_AUTHOR("Jonathan Cameron");
  93 MODULE_DESCRIPTION("ALSA SoC Imote 2");
  94 MODULE_LICENSE("GPL");
  95 MODULE_ALIAS("platform:imote2-audio");