嵌入式Linux之我行——Linux-2.6.30.4在2440上的移植之UDA1341声卡驱动

本文详细介绍如何将UDA1341声卡驱动移植到Linux-2.6.30.4内核中，并解决了播放音视频时出现的断断续续问题。包括替换驱动源码、定义声卡设备、配置内核选项及测试声卡等关键步骤。

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原文地址：嵌入式Linux之我行——Linux-2.6.30.4在2440上的移植之UDA1341声卡驱动作者：hbhuanggang

嵌入式Linux之我行，主要讲述和总结了本人在学习嵌入式linux中的每个步骤。一为总结经验，二希望能给想入门嵌入式Linux的朋友提供方便。如有错误之处，谢请指正。

共享资源，欢迎转载：http://hbhuanggang.cublog.cn

一、移植环境

主机：VMWare--Fedora 9
开发板：Mini2440--64MB Nand
编译器：arm-linux-gcc-4.3.2

二、移植步骤

1. 替换声卡驱动源码。因linux-2.6.30.4中版本为1.0.20的声卡驱动有bug，在播放音视频时会出现断断续续的现象，所以我们先用早期版本1.0.18a替换之(可在linux-2.6.29.xxx的内核中提取)，具体操作如下：

#cp -rf /linux-2.6.29.xxx/sound /linux-2.6.30.4/sound //替换sound目录

#cp -rf /linux-2.6.29.xxx/include/sound /linux-2.6.30.4/include/sound //替换include/sound目录

#cp -rf /linux-2.6.29.xxx/include/asm-arm /linux-2.6.30.4/include //复制include/asm-arm目录

#cp -f /linux-2.6.29.xxx/arch/arm/mach-s3c2410/include/mach/audio.h /linux-2.6.30.4/arch/arm/mach-s3c2410/include/mach //复制audio.h到相应目录

#gedit /linux-2.6.30.4/include/linux/proc_fs.h //修改proc_fs.h文件，在第70行添加如下内容

struct module *owner; //因为在sound/core/info.c第159和982行中用到

2. 定义并添加声卡设备到系统设备初始化列表中

#gedit arch/arm/plat-s3c24xx/devs.c //定义，添加如下内容

#include <mach/regs-gpio.h> #include <sound/s3c24xx_uda134x.h> /* 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);

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

extern struct platform_device s3c_device_uda134x;

#gedit arch/arm/mach-s3c2440/mach-smdk2440.c //添加到设备列表，红色部分

static struct platform_device *smdk2440_devices[] __initdata = { &s3c_device_usb, &s3c_device_sdi, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_iis, &s3c_device_rtc, &s3c_device_dm9000, &s3c_device_uda134x, };

3. 配置内核选项

Device Drivers ---> <*> Sound card support ---> --- Sound card support <*> Advanced Linux Sound Architecture ---> --- Advanced Linux Sound Architecture < > Sequencer support <*> OSS Mixer API <*> OSS PCM (digital audio) API [*] OSS PCM (digital audio) API - Include plugin system [ ] Dynamic device file minor numbers [*] Support old ALSA API [*] Verbose procfs contents [*] Verbose printk [ ] Debug [ ] Generic sound devices ---> [ ] ARM sound devices ---> [ ] SPI sound devices ---> [*] USB sound devices ---> <*> ALSA for SoC audio support ---> --- ALSA for SoC audio support <*> SoC Audio for the Samsung S3C24XX chips < > SoC AC97 Audio support for LN2440SBC - ALC650 <*> SoC I2S Audio support UDA134X wired to a S3C24XX < > Build all ASoC CODEC drivers < > Open Sound System (DEPRECATED) --->