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这篇和做对照
*针对不同的平台。可能放进的不是以下的文件内，仅仅做參考
1、头文件
放进：linux-3.0.8\arch\arm\plat-samsung\include\plat
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、设备文件
方法一：将设备资源直接加进/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 = {。。 。。。
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②将设备信息加入总线 改动arch/arm/mach-s5pv210/mach-smdkv210.c文件 static struct platform_device *smdkv210_devices[] __initdata = { ... ... /*加入例如以下代码*/ &s5pv210_led_device_lhy, //新加入的 } 方法二： ①将设备文件dev-led.c 放进 linux-3.0.8/arch/arm/plat-samsung
led_dev.c
#include②向arch/arm/mach-s5pv210/mach-smdkv210.c(跟平台架构相关文件)加入#include #include #include struct platform_device s5pv210_led_device_lhy = { .name = "s5pv210_led_lhy", .id = 1,};
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.o④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加入外部声明arch/arm/plat-samsung/include/plat/devs.h
extern struct platform_device s5pv210_led_device_lhy;====================================================================================================================================
3、平台驱动
①将led_drv.c 放进linux-3.0.8/drivers/my_led
led_drv.c
#include②在当前文件夹的Kconfig后加入，没有就新建//register_chrled#include //class_create/ledice_create#include //kmalloc#include //copy_to_user/copy_from_user#include //ioremap#include //gpio_request#include //s3c_gpio_cfgpin#include //cdev_alloc#include //下面是移植时须要添加的#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()-%d\n", __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()-%d\n", __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()-%d\n", __func__, __LINE__); return 0;}static long led_ioctl(struct file *file, unsigned int cmd, unsigned long val){ printk(KERN_INFO"%s()-%d\n", __func__, __LINE__); printk(KERN_INFO"cmd=%d arg=%ld\n", 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_led\n"); return -ENOMEM; } /*1. 动态注冊/申请主设备*/ ret=alloc_chrdev_region(&led_drv->devno,0,1,"dev_module"); if (ret < 0) { printk(KERN_ERR "unable to get major\n"); return -EFAULT; goto out_err_1; } //从设备号中分离出主设备号 led_drv->led_major = MAJOR(led_drv->devno); /*为cdev分配空间*/ 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); /*注冊字符设备*/ cdev_add(led_drv->led_cdev,led_drv->devno,1); /*2. 创建设备类*/ 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_class\n"); ret = -ENODATA; goto out_err_2; } /*3. 创建设备文件*/ 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_device\n"); ret = -ENODEV; goto out_err_3; } /*申请GPC0_3，4引脚资源*/ 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");
config S5PV210_LED_DRV tristate "led_dev for fs210 device" help led driver is for s5pv210, choose y/m/n③在当前文件夹的Makefile后加入，没有就新建
obj-$(CONFIG_S5PV210_LED_DRV) = led_drv.o ④改动上级文件夹的Makefile和Kconfig
将linux-3.0.8/drivers/Kconfig 加入
source "drivers/my_led/Kconfig"将linux-3.0.8/drivers/Makefile 加入
obj-y += mydriver/ 最后就是自己make menuconfig里配置选项了。
====================================================================================================================================4、測试程序
编译測试要使用交叉工具连 arm-none-linux-gnueabi-gcc led_test.c -o led_test 附：
将可运行文件增加到开机启动，改动根文件系统filesystem
vi filesystem/etc/init.d/rcS./star_app/led_test
測试程序
#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:一闪一闪亮晶晶 ||\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;}
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