9745e824a8
Instead of unconditionally enabling the crystal oscillator on the WM8731 only enable it when explicitly selected via set_sysclk(), allowing machine drivers to specify that they drive a clock into MCLK alone. This avoids any conflicts between the oscillator and the external MCLK source and saves power for systems which do not need the oscillator. This should also deliver a small power saving on systems using the crystal since the oscillator will only be enabled when the ADC or DAC is active. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* DB1200 ASoC audio fabric support code.
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*
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* (c) 2008-9 Manuel Lauss <manuel.lauss@gmail.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/mach-au1x00/au1xxx_psc.h>
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#include <asm/mach-au1x00/au1xxx_dbdma.h>
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#include <asm/mach-db1x00/bcsr.h>
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#include "../codecs/wm8731.h"
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#include "psc.h"
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/*------------------------- AC97 PART ---------------------------*/
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static struct snd_soc_dai_link db1200_ac97_dai = {
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.name = "AC97",
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.stream_name = "AC97 HiFi",
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.cpu_dai_name = "au1xpsc-ac97",
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.codec_dai_name = "ac97-hifi",
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.platform_name = "au1xpsc-pcm-audio",
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.codec_name = "ac97-codec",
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};
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static struct snd_soc_card db1200_ac97_machine = {
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.name = "DB1200_AC97",
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.dai_link = &db1200_ac97_dai,
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.num_links = 1,
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};
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/*------------------------- I2S PART ---------------------------*/
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static int db1200_i2s_startup(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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int ret;
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/* WM8731 has its own 12MHz crystal */
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snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
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12000000, SND_SOC_CLOCK_IN);
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/* codec is bitclock and lrclk master */
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ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_LEFT_J |
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SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
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if (ret < 0)
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goto out;
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ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_LEFT_J |
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SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
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if (ret < 0)
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goto out;
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ret = 0;
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out:
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return ret;
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}
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static struct snd_soc_ops db1200_i2s_wm8731_ops = {
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.startup = db1200_i2s_startup,
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};
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static struct snd_soc_dai_link db1200_i2s_dai = {
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.name = "WM8731",
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.stream_name = "WM8731 PCM",
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.cpu_dai_name = "au1xpsc",
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.codec_dai_name = "wm8731-hifi"
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.platform_name = "au1xpsc-pcm-audio",
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.codec_name = "wm8731-codec.0-001a",
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.ops = &db1200_i2s_wm8731_ops,
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};
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static struct snd_soc_card db1200_i2s_machine = {
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.name = "DB1200_I2S",
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.dai_link = &db1200_i2s_dai,
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.num_links = 1,
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};
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/*------------------------- COMMON PART ---------------------------*/
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static struct platform_device *db1200_asoc_dev;
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static int __init db1200_audio_load(void)
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{
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int ret;
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ret = -ENOMEM;
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db1200_asoc_dev = platform_device_alloc("soc-audio", -1);
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if (!db1200_asoc_dev)
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goto out;
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/* DB1200 board setup set PSC1MUX to preferred audio device */
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if (bcsr_read(BCSR_RESETS) & BCSR_RESETS_PSC1MUX)
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platform_set_drvdata(db1200_asoc_dev, &db1200_i2s_machine);
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else
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platform_set_drvdata(db1200_asoc_dev, &db1200_ac97_machine);
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ret = platform_device_add(db1200_asoc_dev);
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if (ret) {
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platform_device_put(db1200_asoc_dev);
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db1200_asoc_dev = NULL;
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}
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out:
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return ret;
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}
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static void __exit db1200_audio_unload(void)
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{
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platform_device_unregister(db1200_asoc_dev);
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}
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module_init(db1200_audio_load);
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module_exit(db1200_audio_unload);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("DB1200 ASoC audio support");
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MODULE_AUTHOR("Manuel Lauss");
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