#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
static struct class *thirddrv_class;
static struct class_device *thirddrv_class_dev;
volatile unsigned long *gpfcon;
volatile unsigned long *gpfdat;
volatile unsigned long *gpgcon;
volatile unsigned long *gpgdat;
static DECLARE_WAIT_QUEUE_HEAD_ONSTACK(button_waitq);
/*中断事件标志，中断服务程序将它置1�third_drv 将它清0 */
static volatile int ev_press = 0;
struct pin_desc {
unsigned int pin;
unsigned int key_val;
};
/*键值:按下时,0x01,0x02,0x03,0x04 */
/*键值:松开时,0x81,0x82,0x83,0x84 */
static unsigned char key_val;
struct pin_desc pins_desc[4] = {
{S3C2410_GPF0, 0x01},
{S3C2410_GPF2, 0x02},
{S3C2410_GPG3, 0x03},
{S3C2410_GPG11, 0x04}, };
/*
*确定按键值
*/
static irqreturn_t buttons_irq(int irq, void *dev_id) {
struct pin_desc * pindesc =(struct pin_desc *)dev_id;
unsigned int pinval;
pinval=s3c2410_gpio_getpin(pindesc->pin);
//读取引脚值
printk(" irq = %d " , irq);
/*确定按键值 */
if(pinval) {
/*松开 */
key_val =0x80 | pindesc->key_val;
}
else
{
/*按下 */
key_val =pindesc->key_val;
}
//表示中断发生了
ev_press =1;
//唤醒休眠的进程
wake_up_interruptible(&button_waitq);
return IRQ_RETVAL(IRQ_HANDLED);
}
static int third_drv_open(struct inode *inode, struct file *file ) {
/*配置GPF0,2为输入引脚 */
/*配置GPF3,11为输入引脚 */
//按键输入，显示16
request_irq (IRQ_EINT0, buttons_irq, IRQT_BOTHEDGE, "s2",& pins_desc[0]);
//按键输入，显示18
request_irq (IRQ_EINT2, buttons_irq, IRQT_BOTHEDGE, "s3",&pins_desc[1]);
//按键输入，显示55
request_irq (IRQ_EINT11, buttons_irq, IRQT_BOTHEDGE, "s4",&pins_desc[2]);
//按键输入，显示63
request_irq (IRQ_EINT19, buttons_irq, IRQT_BOTHEDGE, "s5", &pins_desc[3]);
return 0;
}
ssize_t third_drv_read (struct file *file, char __user *buf, size_t size, loff_t *ppos)
{
/*返回四个引脚的电平 */
//unsigned char key_vals[4];
//int regval;
//if (size != sizeof(key_vals)) if (size != 1) return -EINVAL;
//如果没有按键动作发生，休眠
wait_event_interruptible(button_waitq, ev_press);
//如果有按键动作发生，直接返回
copy_to_user(buf, &key_val, 1); ev_press =0;
/*读取GPF0,2*/ /*regval= *gpfdat;
key_vals [0]= ( regval & (1<<0) ) ? 1:0;
key_vals [1]= ( regval & (1<<2) ) ? 1:0;
*/
/*读取GPF3,11*/ /*regval= *gpgdat;
key_vals [2]= ( regval & (1<<3) ) ? 1:0;
key_vals [3]= ( regval & (1<<11) ) ? 1:0;
copy_to_user(buf, key_vals , sizeof(key_vals));
*/ //return sizeof(key_vals); return 1; }
int third_drv_close (struct inode *inode, struct file *file) {
free_irq(IRQ_EINT0, &pins_desc[0]);
free_irq(IRQ_EINT2, &pins_desc[1]);
free_irq(IRQ_EINT11, &pins_desc[2]);
free_irq(IRQ_EINT9, &pins_desc[3]);
return 0;
}
static struct file_operations third_drv_fops= {
.owner=THIS_MODULE,
.open = third_drv_open,
.read= third_drv_read,
.release = third_drv_close,
};
int major; static int third_drv_init() {
major=register_chrdev (0, "third_drv", & third_drv_fops);
thirddrv_class = class_create(THIS_MODULE, "thirddrv");
/*if (IS_ERR(firstdrv_class)) return PTR_ERR(firstdrv_class);
*/
thirddrv_class_dev= class_device_create(thirddrv_class, NULL, MKDEV(major, 0), NULL, "buttons");
/*if (unlikely(IS_ERR(firstdrv_class_dev)))
return PTR_ERR(firstdrv_class_dev);*/
gpfcon =(volatile unsigned long * )ioremap(0x56000050,16);
gpfdat=gpfcon+1;
gpgcon =(volatile unsigned long * )ioremap(0x56000060,16);
gpgdat=gpgcon+1;
return 0;
}
static void third_drv_exit() {
unregister_chrdev ( major, "third_drv");
class_device_unregister(thirddrv_class_dev);
class_destroy(thirddrv_class);
iounmap(gpfcon);
iounmap(gpgcon); return 0;
}
module_init(third_drv_init);
module_exit(third_drv_exit);
MODULE_LICENSE("GPL");