linux_s3c2410_gpio.rar_GPIO_GPIO linux _gpio 2410_linux gpio_s3c

#include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/delay.h> #include <linux/poll.h> #include <linux/spinlock.h> #include <linux/irq.h> #include <asm-arm/hardware.h> #define DEVICE_NAME "led" #define LED_MAJOR 231 static unsigned long led_table[]={GPIO_B0,GPIO_B1,GPIO_B2,GPIO_B3}; static int led_ioctl(struct inode *inode,struct file *file,unsigned int cmd,unsigned long arg) { write_gpio_bit(led_table[arg],!cmd); return -EINVAL; } static struct file_operations led_fops={ owner:THIS_MODULE,ioctl:led_ioctl}; static devfs_handle_t devfs_handle; static int __init led_int(void) { int ret; int i; ret=register_chrdev(LED_MAJOR,DEVICE_NAME,&led_fops); if(ret<0) { printk(DEVICE_NAME"can't register major number\n"); return ret; } devfs_handle=devfs_register(NULL,DEVICE_NAME,DEVFS_FL_DEFAULT,LED_MAJOR,0,S_IFCHR|S_IRUSR|S_IWUSR,&led_fops,NULL); for(i=0;i<4;i++) { set_gpio_ctrl(led_table[i]|GPIO_PULLUP_EN|GPIO_MODE_OUT); write_gpio_bit(led_table[i],1); } printk(DEVICE_NAME"is initialized!Made by fsgu\n"); return 0; } static void __exit led_exit(void) { devfs_unregister(devfs_handle); unregister_chrdev(LED_MAJOR,DEVICE_NAME); printk(DEVICE_NAME" is uninstalled! Made by fsgu\n"); } module_init(led_int); module_exit(led_exit);