LED.rar_LED_led驱动

#include <linux/module.h> #include <linux/init.h> #include <linux/cdev.h> #include <linux/fs.h> #include <linux/io.h> #include <mach/gpio-bank-k.h> #include "led.h" #define LEDCON 0x7f008800 #define LEDDAT 0x7f008808 unsigned int *led_config; unsigned int *led_data; struct cdev cdev; dev_t devno; int led_open(struct inode *node, struct file *filp) { led_config = ioremap(LEDCON,4); writel(0x11110000,led_config); led_data = ioremap(LEDDAT,4); return 0; } long led_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { switch (cmd) { case LED_ON: writel(0x00,led_data); return 0; case LED_OFF: writel(0xff,led_data); return 0; default: return -EINVAL; } } static struct file_operations led_fops = { .open = led_open, .unlocked_ioctl = led_ioctl, }; static int led_init() { cdev_init(&cdev,&led_fops); alloc_chrdev_region(&devno, 0 , 1 , "myled"); cdev_add(&cdev, devno, 1); return 0; } static void led_exit() { cdev_del(&cdev); unregister_chrdev_region(devno,1); } module_init(led_init); module_exit(led_exit);