UDA1341TS驱动在FL2440的移植(2.6.33.7内核)

、移植环境

    主  机：Fedora 14 （kernel-2.6.33.7）
    开发板：FL2440(nandflash:K9F1G08 128MB)

    编译器：arm-linux-gcc-4.3.2

 

二、移植步骤

    1. 根据FL2440赠送的光盘资料可以得知，FL2440的声卡是采用PHILIPS公司的UDA1341TS型号的声卡。在没有声卡uda驱动之前，启动开发板，从系统启动信息可以看到声卡跟s3c2440的I2S并没有映射起来。

usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
No device for DAI UDA134X
No device for DAI s3c24xx-i2s
ALSA device list:
No soundcards found.

     2. uda驱动的移植也主要是以linux-2.6.33.7内核中自带的驱动程序为主，我只是做少量的修改与配置。打开mach-smdk2440.c文件开始配置。

#vim arch/arm/mach-s3c2440/mach-smdk2440.c

    增加头两个用到的文件:

#include <sound/s3c24xx_uda134x.h>
#include <mach/gpio-fns.h>

    在LCD配置信息结构体后面开始增加声卡配置的结构体:

//uda1341 sound card driver

static struct s3c24xx_uda134x_platform_data s3c24xx_uda134x_data = {
        .l3_clk = S3C2410_GPB(4),
        .l3_data = S3C2410_GPB(3),
        .l3_mode = S3C2410_GPB(2),
        .model = UDA134X_UDA1341,
};
static struct platform_device s3c24xx_uda134x = {
        .name = "s3c24xx_uda134x",
        .dev = {
                .platform_data = &s3c24xx_uda134x_data,
        }
};

    配置好后，把配置信息加入到平台中：

static struct platform_device *smdk2440_devices[] __initdata = {
        &s3c_device_usb,
        &s3c_device_lcd,
        &s3c_device_wdt,
        &s3c_device_i2c0,
        &s3c_device_iis,
        &s3c_device_rtc,
        &s3c24xx_uda134x, //uda

};

     到这里就基本上完成了配置，剩下的就是配置内核。

     3. 内核各相关项配置如下。

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) --->

     4. 编译下载#make zImage。很奇怪的是好像这次配置并没有启动作用，有了LCD和RTC驱动移植的经验，我很快又找到了思路，那就是修改mach-smdk2410.c程序。

#vim arch/arm/mach-s3c2410/mach-smdk2410.c

    增加头两个用到的文件:

#include <sound/s3c24xx_uda134x.h>
#include <mach/gpio-fns.h>

    在LCD配置信息结构体后面开始增加声卡配置的结构体:

//uda1341 sound card driver
static struct s3c24xx_uda134x_platform_data s3c24xx_uda134x_data = {
        .l3_clk = S3C2410_GPB(4),
        .l3_data = S3C2410_GPB(3),
        .l3_mode = S3C2410_GPB(2),
        .model = UDA134X_UDA1341,
};
static struct platform_device s3c24xx_uda134x = {
        .name = "s3c24xx_uda134x",
        .dev = {
                .platform_data = &s3c24xx_uda134x_data,
        }
};

    配置好后，把配置信息加入到平台中：

static struct platform_device *smdk2410_devices[] __initdata = {
        &s3c_device_usb,
        &s3c_device_lcd,
        &s3c_device_wdt,
        &s3c_device_i2c0,
        &s3c_device_iis,
        &s3c_device_rtc,
        &s3c24xx_uda134x, //uda
};

    编译后出现如下错误：

[skywalker@localhost linux-2.6.33]$ make zImage
  CHK include/linux/version.h
  CHK include/generated/utsrelease.h
make[1]: “include/generated/mach-types.h”是最新的。
  CALL scripts/checksyscalls.sh
  CHK include/generated/compile.h
  CC arch/arm/mach-s3c2410/mach-smdk2410.o
arch/arm/mach-s3c2410/mach-smdk2410.c:134: error: implicit declaration of function `S3C2410_GPB'
arch/arm/mach-s3c2410/mach-smdk2410.c:134: error: initializer element is not constant
arch/arm/mach-s3c2410/mach-smdk2410.c:134: error: (near initialization for `s3c24xx_uda134x_data.l3_clk')
arch/arm/mach-s3c2410/mach-smdk2410.c:135: error: initializer element is not constant
arch/arm/mach-s3c2410/mach-smdk2410.c:135: error: (near initialization for `s3c24xx_uda134x_data.l3_data')
arch/arm/mach-s3c2410/mach-smdk2410.c:136: error: initializer element is not constant
arch/arm/mach-s3c2410/mach-smdk2410.c:136: error: (near initialization for `s3c24xx_uda134x_data.l3_mode')
arch/arm/mach-s3c2410/mach-smdk2410.c:147: warning: 'smdk2440_devices' defined but not used
make[1]: *** [arch/arm/mach-s3c2410/mach-smdk2410.o] 错误 1
make: *** [arch/arm/mach-s3c2410] 错误 2

    被这几个错误弄得有点糊涂了，后来跟踪了一下代码，发现原来S3C2410_GPB这个宏是定义在mach/gpio-nrs.h头文件里的，于是乎增加了这个头文件，再编译，终于生成了内核映象文件。下载到开发板，从系统的启动信息可以看到声2440的I2S和uda已经关联起来了。

sbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
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)

    5. 验证。先建立设备节点

 #mkdir /dev/sound
 #mknod /dev/sound/dsp c 14 4
 #cat /dev/sound/dsp > /tmp/test.wav
 ^c
 # ls -l tmp
 drwx------ 1 root root 2048 Jan 27 10:48 qtembedded-0
 drwx------ 1 root root 2048 Jan 27 10:48 qtopia-0
 -rw-r--r-- 1 root root 49152 Jan 27 10:43 test.wav
 # cat /tmp/test/wav > /dev/sound/dsp
 #

 ok，声卡驱动大功告成。