smart210驱动（12）audio

最新推荐文章于 2023-01-01 22:57:34 发布

原创最新推荐文章于 2023-01-01 22:57:34 发布 · 457 阅读

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本文介绍在Linux环境下，如何为smart210平台配置wm8960音频驱动，包括Makefile和Kconfig文件的修改，以及音频设备初始化过程。通过详细步骤和代码示例，展示了如何实现音频输入输出的正确配置。

音频驱动

这里smart210_wm8960.c放在drivers/sound/soc/下并修改Makefile和Kconfig

Makefile

# S3c24XX Platform Support



# S3C24XX Machine Support
snd-soc-bells-objs := bells.o
snd-soc-smart210-wm8960-objs := smart210_wm8960.o

obj-$(CONFIG_SND_SOC_BELLS) += snd-soc-bells.o
obj-$(CONFIG_SND_SOC_SMART210_WM8960) += snd-soc-smart210-wm8960.o

Kconfig

config SND_SOC_SAMSUNG
	tristate "ASoC support for Samsung"
	depends on PLAT_SAMSUNG
	select S3C64XX_DMA if ARCH_S3C64XX
	select S3C2410_DMA if ARCH_S3C24XX
	help
	  Say Y or M if you want to add support for codecs attached to
	  the Samsung SoCs' Audio interfaces. You will also need to
	  select the audio interfaces to support below.

config SND_S3C24XX_I2S
	tristate
	select S3C2410_DMA

config SND_S3C_I2SV2_SOC
	tristate

config SND_S3C2412_SOC_I2S
	tristate
	select SND_S3C_I2SV2_SOC
	select S3C2410_DMA

config SND_SAMSUNG_PCM
	tristate

config SND_SAMSUNG_AC97
	tristate
	select SND_SOC_AC97_BUS

config SND_SAMSUNG_SPDIF
	tristate
	select SND_SOC_SPDIF

config SND_SAMSUNG_I2S
	tristate




config SND_SOC_SAMSUNG_SMDK_WM8994
	tristate "SoC I2S Audio support for WM8994 on SMDK"
	depends on SND_SOC_SAMSUNG
	depends on I2C=y && GENERIC_HARDIRQS
	select MFD_WM8994
	select SND_SOC_WM8994
	select SND_SAMSUNG_I2S
	help
	  Say Y if you want to add support for SoC audio on the SMDKs.

config SND_SOC_SMART210_WM8960
	tristate "SoC I2S Audio support for WM8960 on smart210"
	depends on SND_SOC_SAMSUNG
	select SND_SOC_WM8960
	select SND_SAMSUNG_I2S
	help
	  Say Y if you want to add support for SoC audio on the smart210.

smart210_wm8960.c

/*
* linux-3.10.79
* arm-linux-gcc-4.5.1
*
* @ audio platform driver
*/

#include <linux/module.h>
#include <linux/init.h>   /* module_init, ... */
#include <linux/kernel.h> /* everything */

#include <linux/cdev.h>   /* cdev_init, ... */
#include <linux/fs.h>     /* file_operations,  */
#include <linux/device.h>  /* class_create,... */
#include <linux/platform_device.h>
#include <linux/slab.h>   /* kmalloc, ... */
#include <asm/io.h>       /* ioremap,... */

#include <sound/soc.h>

static int smart210_audio_hw_params(struct snd_pcm_substream * substream, 
				struct snd_pcm_hw_params *params)
{
	return 0;
}

const struct snd_soc_ops smart210_audio_ops = 
{
	.hw_params = smart210_audio_hw_params,
};

static const struct snd_soc_dapm_widget smart210_dapm_capture_widgets[] = {
	SND_SOC_DAPM_MIC(	"Mic Jack",			NULL ),
	SND_SOC_DAPM_LINE(	"Line Input 3 (FM)",NULL ),
};

static const struct snd_soc_dapm_widget smart210_dapm_playback_widgets[] = {
	SND_SOC_DAPM_HP(	"Headphone Jack",	NULL ),
	SND_SOC_DAPM_SPK(	"Speaker_L",		NULL ),
	SND_SOC_DAPM_SPK(	"Speaker_R",		NULL ),
};

static const struct snd_soc_dapm_route smart210_audio_map[] = {
	{ "Headphone Jack",	NULL,	"HP_L"		},
	{ "Headphone Jack",	NULL, 	"HP_R"		},
	{ "Speaker_L",		NULL, 	"SPK_LP"	}, 
	{ "Speaker_L",		NULL, 	"SPK_LN" 	}, 
	{ "Speaker_R",		NULL, 	"SPK_RP" 	}, 
	{ "Speaker_R",		NULL, 	"SPK_RN" 	}, 
	{ "LINPUT1",		NULL, 	"MICB"		},
	{ "MICB",			NULL, 	"Mic Jack"	},
};

static int smart210_audio_init(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_dapm_context *dapm = &codec->dapm;

	pr_info("%s called .\n", __func__);

	snd_soc_dapm_nc_pin(dapm, "RINPUT1");
	snd_soc_dapm_nc_pin(dapm, "LINPUT2");
	snd_soc_dapm_nc_pin(dapm, "RINPUT2");
	snd_soc_dapm_nc_pin(dapm, "OUT3");
	
	snd_soc_dapm_new_controls( dapm, smart210_dapm_capture_widgets, ARRAY_SIZE( smart210_dapm_capture_widgets ) );
	snd_soc_dapm_new_controls( dapm, smart210_dapm_playback_widgets, ARRAY_SIZE( smart210_dapm_playback_widgets ) );

	snd_soc_dapm_add_routes( dapm, smart210_audio_map, ARRAY_SIZE( smart210_audio_map ) );

	snd_soc_dapm_enable_pin(dapm, "Headphone Jack");
	snd_soc_dapm_enable_pin(dapm, "Mic Jack");
	snd_soc_dapm_enable_pin(dapm, "Speaker_L");
	snd_soc_dapm_enable_pin(dapm, "Speaker_R");
	
	snd_soc_dapm_disable_pin(dapm, "Line Input 3 (FM)");

	snd_soc_dapm_sync( dapm );

	return 0;
}

static struct snd_soc_dai_link smart210_dai = {
	.name = "smart210 audio",
	.stream_name = "wm8960 HiFi",
	.codec_name = "wm8960.0-001a",
	.platform_name = "samsung-i2s.0",
	.cpu_dai_name = "samsung-i2s.0",
	.codec_dai_name = "wm8960-hifi",
	.init = smart210_audio_init,
	.ops =  &smart210_audio_ops,
};

static struct snd_soc_card smart210_soc_card = {
	.name = "smart210_audio",
	.dai_link = &smart210_dai,
	.num_links = 1,
};

static struct platform_device *smart210_audio_device;

static int smart210_wm8960_init(void)
{
	int ret = 0;
	
	pr_info("%s called .\n", __func__);

	smart210_audio_device = platform_device_alloc("soc-audio", -1);
	if(!smart210_audio_device){
		return -ENOMEM;
	}

	platform_set_drvdata(smart210_audio_device, &smart210_soc_card);

	ret = platform_device_add(smart210_audio_device);
	if(ret){
		platform_device_put(smart210_audio_device);
	}
	
	return 0;
}

static void smart210_wm8960_exit(void)
{
	pr_info("%s called .\n", __func__);
	
	platform_device_unregister(smart210_audio_device);
}

module_init(smart210_wm8960_init);
module_exit(smart210_wm8960_exit);
MODULE_LICENSE("GPL");

最终启动日志有：

log:

[    1.536469] wm8960_i2c_probe called.
[    1.543415] smart210_wm8960_init called .
[    1.543850] soc-audio soc-audio: ASoC: machine smart210_audio should use snd_soc_register_card()
[    1.543968] soc-audio soc-audio: ASoC: binding smart210 audio at idx 0
[    1.544045] soc-audio soc-audio: register codec: wm8960.0-001a <-> current codec : wm8960.0-001a
[    1.549795] soc-audio soc-audio: register codec: snd-soc-dummy <-> current codec : wm8960.0-001a
[    1.558344] soc-audio soc-audio: registered platform: samsung-idma <-> current platform : samsung-i2s.0
[    1.567605] soc-audio soc-audio: registered platform: samsung-i2s.0 <-> current platform : samsung-i2s.0
[    1.577109] soc-audio soc-audio: registered platform: samsung-i2s-sec <-> current platform : samsung-i2s.0
[    1.586844] soc-audio soc-audio: registered platform: snd-soc-dummy <-> current platform : samsung-i2s.0
[    1.596424] wm8960 0-001a: No platform data supplied
[    1.709963] smart210_audio_init called .
[    1.710763] soc-audio soc-audio:  wm8960-hifi <-> samsung-i2s.0 mapping ok

mapping ok ,表示能正常识别声卡。后面的测试有空再补上。