linux-2.6.29.1在utu2440上的移植--uda1341驱动

一、开发平台

主  机：VMWare--Fedora 8

开发板：utu2440--64MB Nand / linux-2.6.29.1

编译器：arm-linux-gcc-4.3.2

 

二、移植步骤

1． 定义并添加声卡设备到系统平台设备初始化列表中

修改arch/arm/plat-s3c24xx/devs.c，添加如下内容

#include

#include

 

/* UDA1341 */

static struct s3c24xx_uda134x_platform_data s3c24xx_uda134x_data = {

         .l3_clk = S3C2410_GPB4,

         .l3_data = S3C2410_GPB3,

         .l3_mode = S3C2410_GPB2,

         .model = UDA134X_UDA1341,

};

 

struct platform_device s3c_device_uda134x = {

         .name = "s3c24xx_uda134x",

         .dev = {

                  .platform_data = &s3c24xx_uda134x_data,

         }

};

 

EXPORT_SYMBOL(s3c_device_uda134x);

 

修改 arch/arm/plat-s3c/include/plat/devs.h，添加如下内容

extern struct platform_device s3c_device_uda134x;

 

修改vi arch/arm/mach-s3c2440/mach-smdk2440.c，找到*smdk2440_devices[]，添加&s3c_device_uda134x,

 

2． 配置内核

Device Drivers  --->

       <*> Sound card support  --->

              <*>   Advanced Linux Sound Architecture  --->

                     <*>   OSS Mixer API

                     <*>   OSS PCM (digital audio) API

                     [*]     OSS PCM (digital audio) API - Include plugin system

                     [*]   Support old ALSA API

                     [*]   Verbose procfs contents

                     [*]   Verbose printk

                     [*]   Generic sound devices  --->

                     <*>   ALSA for SoC audio support  --->

                            <*>   SoC Audio for the Samsung S3C24XX chips

                            <*>   SoC I2S Audio support UDA134X wired to a S3C24XX

 

3． 编译内核并下载到开发板，在启动信息中可以看到uda1341驱动已加载成功

Advanced Linux Sound Architecture Driver Version 1.0.18a.

No device for DAI UDA134X

No device for DAI s3c24xx-i2s

S3C24XX_UDA134X SoC Audio driver

UDA134X SoC Audio Codec

asoc: UDA134X <-> s3c24xx-i2s mapping ok

ALSA device list:

  #0: S3C24XX_UDA134X (UDA134X)

 

# cat /proc/devices

可以看到多了主设备号为14的设备名sound, 并且在/dev下多了dsp和mixer两个设备结点

# ls /dev/dsp –l

crw-rw----    1 root     root      14,   3 Jan  9 11:41 /dev/dsp

# ls /dev/mixer –l

crw-rw----    1 root     root      14,   0 Jan  9 11:41 /dev/mixer

 

挂载U盘，拷贝一首歌曲到开发板home目录中，

# cat music.mp3 > /dev/dsp，可以听到耳机发出噪声，至此声卡驱动移植完成