gpio.rar_linux gpio

/************************************* NAME:sky2440_leds.c COPYRIGHT:www.embedsky.net *************************************/ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/devfs_fs_kernel.h> #include <linux/miscdevice.h> #include <linux/delay.h> #include <asm/irq.h> #include <asm/arch/regs-gpio.h> #include <asm/hardware.h> #define DEVICE_NAME "wkk_leds" #define LED_MAJOR 245 static unsigned long led_table [] = { S3C2410_GPB5, S3C2410_GPB6, S3C2410_GPB7, S3C2410_GPB8, }; static unsigned int led_cfg_table [] = { S3C2410_GPB5_OUTP, S3C2410_GPB6_OUTP, S3C2410_GPB7_OUTP, S3C2410_GPB8_OUTP, }; static int sky2440_leds_ioctl( struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { switch(cmd) { case 0: case 1: if (arg > 4) { return -EINVAL; } s3c2410_gpio_setpin(led_table[arg], !cmd); return 0; default: return -EINVAL; } } static struct file_operations sky2440_leds_fops = { .owner = THIS_MODULE, .ioctl = sky2440_leds_ioctl, }; static int __init sky2440_leds_init(void) { int ret; int i; ret = register_chrdev(LED_MAJOR, DEVICE_NAME, &sky2440_leds_fops); if (ret < 0) { printk(DEVICE_NAME " can't register major number\n"); return ret; } devfs_mk_cdev(MKDEV(LED_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, DEVICE_NAME); for (i = 0; i < 4; i++) { s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]); s3c2410_gpio_setpin(led_table[i], 1); } printk(DEVICE_NAME " initialized\n"); return 0; } static void __exit sky2440_leds_exit(void) { devfs_remove(DEVICE_NAME); unregister_chrdev(LED_MAJOR, DEVICE_NAME); } module_init(sky2440_leds_init); module_exit(sky2440_leds_exit);