/*****************************************Copyright (c)****************************************************                               Guangzhou Zhiyuan Electronic Co.,LTD.**                                     graduate school**                                 http://www.zyinside.com****------------------------------------- File Info ------------------------------------------------------** File name:           magic-key.c** Last modified Date:  2005-12-28** Last Version:        1.0** Descriptions:        Driver for KEY1 on MagicARM2410.**                      Based on Linux 2.4.18. **------------------------------------------------------------------------------------------------------** Created by:          Chenxibing** Created date:        2005-12-27** Version:             1.0** Descriptions:        Preliminary version.****------------------------------------------------------------------------------------------------------** Modified by:** Modified date:** Version:** Descriptions:***********************************************************************************************************/#ifndef __KERNEL__	#define __KERNEL__#endif#ifndef MODULE	#define MODULE#endif#include <linux/config.h>#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/sched.h>#include <linux/poll.h>#include <linux/spinlock.h>#include <linux/irq.h>#include <linux/wait.h>//#include <linux/devfs_fs_kernel.h>//#include <linux/miscdevice.h>//#include <linux/delay.h>#include <asm/hardware.h>#define DEVICE_NAME	"magic-key"#define KEY_MAJOR 	231	// can be 231~239 or 240~254MODULE_LICENSE("Proprietary");MODULE_DESCRIPTION("Guangzhou Zhiyuan Electronic Co.,LTD.\ngraduate school\nhttp://www.zyinside.com");MODULE_SUPPORTED_DEVICE("Linux 2.4.18 & MagicARM2410");MODULE_AUTHOR("Chenxibing");/********************************************************************************************************** Information of KEY1.********************************************************************************************************/static struct key_info{	int 		irq_num;	unsigned int 	gpio_port;	int 		key_num;} key1[1] ={	{ IRQ_EINT4, GPIO_F4, 1 },};static int key_value = 0;static int ready = 0;/********************************************************************************************************** Function name: key_irq()** Descriptions	: key1's irq handler.**		: for request_irq() and free_irq().** handler prototype:**		: void (*handler)(int irq, void *dev_id, struct pt_regs*).** Input:**      irq	: irq number. **	dev_id	: private data.**	pt_regs	: seldom use.** Output:**	return	: NONE.** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static DECLARE_WAIT_QUEUE_HEAD(key_wait);static void key_irq_handle(int irq, void *dev_id, struct pt_regs *reg){	struct key_info *key;	key = key1;        key_value = key->key_num;	ready = 1;	wake_up_interruptible(&key_wait);}/********************************************************************************************************** Function name: magic_key_read()** Descriptions	: read key1's value.** Input:**      filp	: pointer of file**	buf	: buf for save data**	count	: size of read	f_ops	: *p_ops = read point** Output:**	return	: read size** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static ssize_t magic_key_read(struct file *filp, char * buf, size_t count, loff_t *f_pos){	static int value;	wait_event_interruptible(key_wait, ready == 1);//	interruptible_sleep_on(&key_wait);	if(count != sizeof(key_value))		return -EINVAL;	value = key_value;        copy_to_user(buf, &value, sizeof(value));	ready = 0;	        return sizeof(value);}/********************************************************************************************************** Function name: magic_key_open()** Descriptions	: open key** Input:**	inode	: information of device**      filp	: pointer of file** Output:**	0	: OK**    	other	: not OK** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static int magic_key_open(struct inode *inode, struct file *filp){	int result;	struct key_info *key;	ready = 0;	key = key1;	set_external_irq(key->irq_num, EXT_FALLING_EDGE, GPIO_PULLUP_DIS);	result = request_irq(key->irq_num, key_irq_handle, SA_INTERRUPT, DEVICE_NAME, NULL);	if(result)	{		printk(KERN_INFO DEVICE_NAME " Failed to request irq.\n");		return result;	}	MOD_INC_USE_COUNT;	printk(KERN_INFO DEVICE_NAME ": opened.\n");	return 0;}/********************************************************************************************************** Function name: magic_key_release()** Descriptions	: release KEY1** Input:**	inode	: information of device**      filp	: pointer of file** Output:**	0	: OK**    	other	: not OK** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static int magic_key_release(struct inode *inode, struct file *filp){	struct key_info *key;	key = key1;	free_irq(key->irq_num, NULL);	MOD_DEC_USE_COUNT;	printk(KERN_INFO DEVICE_NAME ": released.\n");	return 0;}/**********************************************************************************************************                                    operations of the driver********************************************************************************************************/static struct file_operations magic_key_fops ={	owner:	THIS_MODULE,	read: 	magic_key_read,	open:	magic_key_open,	release:	magic_key_release,};/********************************************************************************************************** Function name: magic_key_init()** Descriptions	: register driver** Input:**		: NONE** Output:**	0	: OK**    	other	: not OK** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static devfs_handle_t devfs_handle;static int __init magic_key_init(void){//	int result;//	result = register_chrdev(KEY_MAJOR, DEVICE_NAME, &magic_key_fops);//	if(result<0)//	{//		printk(KERN_INFO "Failed to register major: " DEVICE_NAME ".\n");//		return result;//	}	devfs_handle = devfs_register(NULL, DEVICE_NAME, DEVFS_FL_DEFAULT,		KEY_MAJOR, 0, S_IFCHR | S_IRUSR | S_IWUSR, &magic_key_fops, NULL);	return 0;}/********************************************************************************************************** Function name: magic_key_exit()** Descriptions	: unregister driver** Input:**		: NONE** Output:**	0	: OK**    	other	: not OK** Created by	: Chenxibing** Created Date	: 2005-12-27**-----------------------------------------------------------------------------------------------------** Modified by	:** Modified Date: **-----------------------------------------------------------------------------------------------------********************************************************************************************************/static void __exit magic_key_exit(void){	devfs_unregister(devfs_handle);//	unregister_chrdev(KEY_MAJOR, DEVICE_NAME);}module_init(magic_key_init);module_exit(magic_key_exit);