#include <linux/module.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/timer.h>#include <linux/interrupt.h>#include <asm/irq.h>#include <asm/hardware.h>#include <asm/uaccess.h>#include <asm/arch/irqs.h>#include <asm/io.h>#include <asm/semaphore.h> #include <linux/major.h>#include <linux/vmalloc.h>#include <linux/fs.h>#define key7_MAJOR 138 #define NOKEY	0#define KEY7	'7'static struct semaphore key_sem;static char key = NOKEY;devfs_handle_t devfs_key7;static void  key7_clearirq(void){	SRCPND &= (~0x00000020);  	INTPND = INTPND;	EINTPEND &= (~0x00000080); }static void key7_irq_isr(int irq, void *dev_id, struct pt_regs *regs){	key7_clearirq();	key=KEY7;	up(&key_sem);}static ssize_t key7_read(struct inode *inode, char *buf, unsigned long count){	down_interruptible(&key_sem);	put_user(key,buf);	key=NOKEY;	return 1;}int key7_open(struct inode *inode, struct file *file){//	key7_clearirq();//	enable_irq(IRQ_EINT7);		sema_init(&key_sem,0);	return 0;}void key7_release(struct inode *inode, struct file *filp){//	key7_cleanirq();//        disable_irq(IRQ_EINT7);        printk("release ok!\n");        return;}struct file_operations key7_fops = {	read:key7_read,	open:key7_open,	release:key7_release,};static int __init key7_init(void){	static int rc;        unsigned long gpfup;	set_external_irq(IRQ_EINT7,EXT_FALLING_EDGE, GPIO_PULLUP_DIS);	        gpfup = ioremap(0x56000058,8);        (*(volatile unsigned long *)gpfup) &= 0x7f;  	disable_irq(IRQ_EINT7);	enable_irq(IRQ_EINT7);		rc = request_irq(IRQ_EINT7, key7_irq_isr, SA_INTERRUPT, "key7", NULL);	if (rc) {		printk("<1>key7irq 1 irq not registered. Error: %d\n", rc);	}		        printk("*********key7 init ok!***********\n");       	/* Register myirq as character device */        devfs_key7 = devfs_register(NULL,"key7",DEVFS_FL_DEFAULT,key7_MAJOR, 0, S_IFCHR |S_IRUSR |S_IWUSR |S_IRGRP |S_IWGRP,  &key7_fops, NULL);	/*        if ((rc = register_chrdev(keyirq_MAJOR, "key7", &key7_fops)) < 0) {		printk("keyirq: can't get major %d\n",keyirq_MAJOR);		return;	}	*/					return 0;}static void __exit key7_exit(void){        	disable_irq(IRQ_EINT7);	        free_irq(IRQ_EINT7, key7_irq_isr);       	devfs_unregister(devfs_key7);}module_init(key7_init);module_exit(key7_exit);//__initcall(key7_init);