LED点灯驱动

来源：互联网发布：linux虚拟机网络文件编辑：程序博客网时间：2024/06/07 21:42

/**  HYfirstdrvtest.c*  应用程序，通过传入的参数来判断是否点灯*/#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <stdio.h>/* firstdrvtest on  * firstdrvtest off  */int main(int argc, char **argv){int fd;int val = 1;fd = open("/dev/xxx", O_RDWR);if (fd < 0){printf("can't open!\n");}write(fd, &val, 4);return 0;}

/**  HYfirst_drv.c*  点灯的驱动*/
#include <linux/module.h>#include <linux/kernel.h>#include <linux/fs.h>#include <linux/init.h>#include <linux/delay.h>#include <asm/uaccess.h>#include <asm/irq.h>#include <asm/io.h>#include <asm/arch/regs-gpio.h>#include <asm/hardware.h>static int first_drv_open(struct inode *inode, struct file *file){printk("open ok ..........\n");return 0;}static ssize_t first_drv_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos){printk("write ok ..........\n");return 0;}static struct file_operations first_drv_fops = {    .owner  =   THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */    .open   =   first_drv_open,     .write=first_drv_write,   };int major;static int first_drv_init(void){    major = register_chrdev(0, "first_drv", &first_drv_fops); // 注册, 告诉内核return 0;}static void first_drv_exit(void){unregister_chrdev(major, "first_drv"); // 卸载}module_init(first_drv_init);module_exit(first_drv_exit);MODULE_LICENSE("GPL");

/**  Makefile*  */


KERN_DIR = /work/system/linux-2.6.22.6all:make -C $(KERN_DIR) M=`pwd` modules clean:make -C $(KERN_DIR) M=`pwd` modules cleanrm -rf modules.orderobj-m += HYfirst_drv.o

阅读全文

0 0