/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");