/* driver/char/led.c  *  this is a led char device driver.  * Any problem pls contact support@hhcn.com */#include <linux/module.h>#include <linux/fs.h>#include <linux/iobuf.h>#include <linux/major.h>#include <linux/blkdev.h>#include <linux/capability.h>#include <linux/smp_lock.h>#include <asm/uaccess.h>#include <asm/hardware.h>#include <asm/arch/cpu_s3c2410.h>#include <asm/io.h>#include <linux/vmalloc.h>#include "led_ioctl.h"#define LED_MAJOR 139#define LED_2 (LED_1 + 1)#define LED_3 (LED_1 + 2)#define LED_4 (LED_1 + 3)#define LED_5 (LED_1 + 4)#define LED_6 (LED_1 + 5)#define led_sle (*(volatile unsigned long *)LED_GPACON)#define led_sle_data (*(volatile unsigned long *)LED_GPADATA)devfs_handle_t devfs_led;unsigned long LED_1;unsigned long LED_GPACON;unsigned long LED_GPADATA;unsigned long led_write_addr;int	led_open(struct inode *, struct file *);int	led_release(struct inode *, struct file *);int   led_ioctl(struct inode *, struct file *, unsigned int, unsigned long);ssize_t led_read(struct file *, char * , size_t );ssize_t led_write(struct file *, char * , size_t );static struct file_operations led_fops = {	open:		led_open,	read:		led_read,	write:	led_write,   ioctl:   led_ioctl,	release:	led_release,};/*  * Open/close code for raw IO. */int led_open(struct inode *inode, struct file *filp){	led_sle |= 0x2000;      //chip_select enable	led_sle_data &= (~0x2000);//0 --> chip_select	printk("open ok\n");	return 0;}ssize_t led_read(struct file *fp, char * buf,                 size_t size){    return 1;}ssize_t led_write(struct file *fp, char * buf,                 size_t size){	char key;	if (get_user(key, buf))	    return -EFAULT;		(*(volatile unsigned char *) led_write_addr) = key;	        return 1;}int led_release(struct inode *inode, struct file *filp){//comment by yczhao//	led_sle &= (~0x2000);   //chip_select disable//	led_sle_data |= 0x2000;	printk("release ok\n");	return 0;}int led_ioctl(struct inode *inode,		        struct file *flip,		        unsigned int command,		        unsigned long arg){	   int err = 0;	   switch (command) {    //judge which led want to light			case IOCTRL_LED_1: 	   	   		led_write_addr = LED_1;				break;			case IOCTRL_LED_2: 	   	   		led_write_addr = LED_2; 	      			break;			case IOCTRL_LED_3: 	   	   		led_write_addr = LED_3; 	      			break;			case IOCTRL_LED_4: 	   	  		led_write_addr = LED_4; 	      			break;			case IOCTRL_LED_5: 	   	   		led_write_addr = LED_5; 	      			break;			case IOCTRL_LED_6: 	   	  		led_write_addr = LED_6; 	      			break;			default:				err = -EINVAL;	}               return err;}int __init led_init(void){	printk("*********************led_init**************\n");	LED_GPACON = ioremap(0x56000000,4);	LED_GPADATA = ioremap(0x56000004,4);		LED_1 = ioremap(0x10000000,8);	        devfs_led = devfs_register(NULL, "led", DEVFS_FL_DEFAULT,LED_MAJOR, 0,	             S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,	             &led_fops, NULL);		  	return 0;}static void __exit led_exit(void){	devfs_unregister(devfs_led);}module_init(led_init);module_exit(led_exit);