*針對不同的平臺。可能放進的不是以下的文件內，僅僅做參考

1、頭文件

放進：linux-3.0.8archarmplat-samsungincludeplat

led.h

#ifndef _HEAD_H

#define _HEAD_H

#define MAGIC 'h'

#define LED_ON _IOW(MAGIC,1,int)

#define LED_OFF _IOW(MAGIC,0,int)

struct led_device{

  dev_t devno;

unsigned int led_major;

struct cdev *led_cdev;

struct class *led_class;

struct device *led_device;

};

#endif

====================================================================================================================================

2、設備文件

方法一：將設備資源直接加進/linux-3.0.8/arch/arm/mach-s5pv210下的mach-smdkv210.c

①                                              

struct platform_device s5pv210_led_device_lhy = {

.name = 's5pv210_led_lhy',

.id = 1,

};

static struct platform_device *smdkv210_devices[] __initdata = {

。。

。。。

。

。。。

。。。

。

。。

。。

。。。

。。。

。。。。

}

②將設備信息加入總線

改動arch/arm/mach-s5pv210/mach-smdkv210.c文件

static struct platform_device *smdkv210_devices[] __initdata = {

...

...

/*加入例如以下代碼*/

&s5pv210_led_device_lhy,    //新加入的

}

 方法二：

①將設備文件dev-led.c 放進 linux-3.0.8/arch/arm/plat-samsung

led_dev.c 

#include

#include

#include

#include

struct platform_device s5pv210_led_device_lhy = {

.name = 's5pv210_led_lhy',

.id = 1,

};

 ②向arch/arm/mach-s5pv210/mach-smdkv210.c(跟平臺架構相關文件)加入

static struct platform_device *smdkv210_devices[] __initdata = {

....

&s5pv210_led_device_lhy,     //新加入

};

 ③向linux-3.0.8/arch/arm/plat-samsung/Makefile加入

obj-$(CONFIG_S3C_DEV_LED)       += led_dev.o

 ④向linux-3.0.8/arch/arm/plat-samsung/Kconfig加入

config S3C_DEV_LED

        bool 'S5PV210 LED  driver support'

        help

             s5pv210 led device support

⑤加入外部聲明arch/arm/plat-samsung/include/plat/devs.h

extern struct platform_device s5pv210_led_device_lhy;

====================================================================================================================================

3、平臺驅動

①將led_drv.c 放進linux-3.0.8/drivers/my_led

led_drv.c 

#include //register_chrled

#include //class_create/ledice_create

#include //kmalloc

#include //copy_to_user/copy_from_user

#include //ioremap

#includegpio.h> //gpio_request

#include //s3c_gpio_cfgpin

#include      //cdev_alloc

#include

//下面是移植時須要添加的

#include

#include

#include

#include

#include

#include

static struct led_device *led_drv;

static int led_open(struct inode *inode, struct file *file)

{

printk(KERN_INFO'%s()-%dn', __func__, __LINE__);

s3c_gpio_cfgpin(S5PV210_GPC0(3),S3C_GPIO_OUTPUT);

s3c_gpio_cfgpin(S5PV210_GPC0(4),S3C_GPIO_OUTPUT);

return 0;

}

static ssize_t led_read(struct file *file, char __user *buf, size_t count, loff_t *offset)

{

printk(KERN_INFO'%s()-%dn', __func__, __LINE__);

return count;

}

ssize_t led_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)

{

printk(KERN_INFO'%s()-%dn', __func__, __LINE__);

return 0;

}

static long led_ioctl(struct file *file, unsigned int cmd, unsigned long val)

{

printk(KERN_INFO'%s()-%dn', __func__, __LINE__);

printk(KERN_INFO'cmd=%d arg=%ldn', cmd, val);

switch(cmd)

{

case LED_ON:

gpio_set_value(S5PV210_GPC0(val),1);

break;

case LED_OFF:

gpio_set_value(S5PV210_GPC0(val),0);

break;

default:

break;

}

return 0;

}

//硬件操作方法

static struct file_operations led_fops={

.owner = THIS_MODULE,

.open   = led_open,

.write  = led_write,

.read   = led_read,

.unlocked_ioctl = led_ioctl,

};

static int s5pv210_led_probe(struct platform_device *pdrv){

int ret;

led_drv = kmalloc(sizeof(struct led_device),GFP_KERNEL);

if(led_drv==NULL){

printk(KERN_ERR'no memory malloc for fs210_ledn');

return -ENOMEM;

}

/*1. 動態注冊/申請主設備*/

ret=alloc_chrdev_region(&led_drv->devno,0,1,'dev_module');

if (ret < 0) {

printk(KERN_ERR 'unable to get majorn');

return -EFAULT;

goto out_err_1;

}

//從設備號中分離出主設備號

led_drv->led_major = MAJOR(led_drv->devno);

/*為cdev分配空間*/

led_drv->led_cdev  = cdev_alloc();

/*注冊硬件操作方法/初始化cdev*/

cdev_init(led_drv->led_cdev,&led_fops);

/*注冊字符設備*/

cdev_add(led_drv->led_cdev,led_drv->devno,1);

/*2. 創建設備類*/

led_drv->led_class=class_create(THIS_MODULE,'led_class');

if (IS_ERR(led_drv->led_class)) {

printk(KERN_ERR 'class_create() failed for led_classn');

ret = -ENODATA;

goto out_err_2;

}

/*3. 創建設備文件*/

led_drv->led_device=device_create(led_drv->led_class,NULL,MKDEV(led_drv->led_major,0),NULL,'led'); //   /led/xxx

if (IS_ERR(led_drv->led_device)) {

printk(KERN_ERR 'device_create failed for led_devicen');

ret = -ENODEV;

goto out_err_3;

}

/*申請GPC0_3，4引腳資源*/

gpio_request(S5PV210_GPC0(3),'LED1');

gpio_request(S5PV210_GPC0(4),'LED2');

return 0;

out_err_3:

class_destroy(led_drv->led_class);

out_err_2:

unregister_chrdev(led_drv->led_major,'led_module');

out_err_1:

kfree(led_drv);

return ret;

}

static int s5pv210_led_remove(struct platform_device *pdrv){

unregister_chrdev(led_drv->led_major,'led_module');

device_destroy(led_drv->led_class,MKDEV(led_drv->led_major,0));

class_destroy(led_drv->led_class);

gpio_free(S5PV210_GPC0(3));

gpio_free(S5PV210_GPC0(4));

kfree(led_drv);

return 0;

}

struct platform_device_id led_ids[]={

[0]={

.name = 's5pv210_led_lhy',

.driver_data = 0,

},

};

static struct platform_driver s5pv210_led_driver = {

.probe = s5pv210_led_probe,

.remove = s5pv210_led_remove,

.driver = { .name = 's5pv210_led_lhy',

.owner = THIS_MODULE, },

.id_table = led_ids,

}; 

static int __devinit s5pv210_led_init(void)

{

return platform_driver_register(&s5pv210_led_driver);

}

static void __devexit s5pv210_led_exit(void)

{

platform_driver_unregister(&s5pv210_led_driver);

}

module_init(s5pv210_led_init);

module_exit(s5pv210_led_exit);

MODULE_DESCRIPTION('LED driver for Marvell PM860x');

MODULE_AUTHOR('kiron');

MODULE_LICENSE('GPL');

MODULE_ALIAS('platform:s5pv210-led');

 ②在當前文件夾的Kconfig后加入，沒有就新建

config S5PV210_LED_DRV

    tristate  'led_dev  for fs210 device'

    help

        led driver is for s5pv210, choose y/m/n

 ③在當前文件夾的Makefile后加入，沒有就新建

obj-$(CONFIG_S5PV210_LED_DRV) = led_drv.o

④改動上級文件夾的Makefile和Kconfig

將linux-3.0.8/drivers/Kconfig  加入

source 'drivers/my_led/Kconfig'

將linux-3.0.8/drivers/Makefile 加入

obj-y        += mydriver/

最后就是自己make menuconfig里配置選項了。

====================================================================================================================================

4、測試程序編譯測試要使用交叉工具連

arm-none-linux-gnueabi-gcc led_test.c -o led_test

附：

將可運行文件增加到開機啟動，改動根文件系統filesystem

vi  filesystem/etc/init.d/rcS

./star_app/led_test

測試程序

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define MAGIC 'h'

#define LED_ON _IOW(MAGIC,1,int)

#define LED_OFF _IOW(MAGIC,0,int)

static void my_sleep(int n){

int j;

for(j=0; j<10000000*n; j++);

}

int main(void)

{

printf('-------------------------------n'

'||   start:一閃一閃亮晶晶    ||n'

'-------------------------------n');

my_sleep(1);

int fd;

unsigned int cmd=0;

unsigned long val=0;

fd=open('/dev/led', O_RDWR);

if(fd<0){

perror('open failed!n');

exit(1);

}

int i;

for(i=0; i<10; i++){

if(i%2==0)

cmd=LED_OFF;

else

cmd=LED_ON;

val=3;            //亮 led3

if(ioctl(fd,cmd,val)<0){

perror('ioctl failed!n');

exit(1);

}

val=4;            //亮 led4

if(ioctl(fd,cmd,val)<0){

perror('ioctl failed!n');

exit(1);

}

my_sleep(1);

}

close(fd);

return 0;

}