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
  10static 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
  45static struct snd_soc_ops imote2_asoc_ops = {
  46        .hw_params = imote2_asoc_hw_params,
  47};
  48
  49static 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
  61static struct snd_soc_card imote2 = {
  62        .name = "Imote2",
  63        .owner = THIS_MODULE,
  64        .dai_link = &imote2_dai,
  65        .num_links = 1,
  66};
  67
  68static 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 = snd_soc_register_card(card);
  76        if (ret)
  77                dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  78                        ret);
  79        return ret;
  80}
  81
  82static int imote2_remove(struct platform_device *pdev)
  83{
  84        struct snd_soc_card *card = platform_get_drvdata(pdev);
  85
  86        snd_soc_unregister_card(card);
  87        return 0;
  88}
  89
  90static struct platform_driver imote2_driver = {
  91        .driver         = {
  92                .name   = "imote2-audio",
  93                .owner  = THIS_MODULE,
  94        },
  95        .probe          = imote2_probe,
  96        .remove         = imote2_remove,
  97};
  98
  99module_platform_driver(imote2_driver);
 100
 101MODULE_AUTHOR("Jonathan Cameron");
 102MODULE_DESCRIPTION("ALSA SoC Imote 2");
 103MODULE_LICENSE("GPL");
 104MODULE_ALIAS("platform:imote2-audio");
 105