按键唤醒去抖动的问题
#include<linux/module.h>#include<linux/kernel.h>
#include<linux/cdev.h>
#include<linux/irq.h>
#include<linux/slab.h>
#include <linux/init.h>
#include <mach/gpio.h>
#include<linux/gpio.h>
#include <linux/input.h>
#include <linux/timer.h>
#define KEY_MAJOR 233
#define DEVICE_NAME "gpio_key"
struct input_dev *buttons_dev;
struct timer_list buttons_timer;
struct work_struct* work;
int irq;
static volatile int status;
static volatile int key_status;
static void gpio_keys_report_event(void)
{
status=gpio_get_value(GPIOG(0));
if(status==1){
input_event(buttons_dev,EV_KEY,KEY_WAKEUP,!!status);
input_sync(buttons_dev);
printk("<0>""the value of pin is %d\n",status);
}
elseif(status==0){
input_event(buttons_dev,EV_KEY,KEY_WAKEUP,!!status);
input_sync(buttons_dev);
printk("<0>""the value of pin2 is %d\n",status);
}
}
static void work_func(struct work_struct *work)
{
int ret=0;
ret=mod_timer(&buttons_timer, jiffies+(HZ/50));
if (ret){
printk("<0>""the mod time is on job with %d\n",ret);
}
}
static void gpio_keys_timer(unsigned long _data)
{
gpio_keys_report_event();
}
static irqreturn_t gpio_key_isr(int irq, void *dev_id)
{
// disable_irq_nosync(irq);
schedule_work(work);
// enable_irq(irq);
return IRQ_HANDLED;
}
static const struct file_operations key_ops={
.owner =THIS_MODULE,
};
static int __init gpio_keys_init(void)
{
int ret = 0;
int error;
ret = register_chrdev(KEY_MAJOR, DEVICE_NAME, &key_ops);
if (ret < 0) {
printk("can't register gpio_keys_number\n");
return -1;
}
buttons_dev = input_allocate_device();
buttons_dev->name="keyboard";
set_bit(EV_KEY,buttons_dev->evbit);
set_bit(EV_REP,buttons_dev->evbit);
set_bit(KEY_WAKEUP,buttons_dev->keybit);
ret=gpio_is_valid(GPIOG(0)); //判断gpio是否合法
printk("<0>""the valid value is %d\n",ret);
if(gpio_request(GPIOG(0),NULL)){
printk("<0>""request gpio error\n");
}
gpio_direction_input(GPIOG(0)); //把pg0设置为输入
irq=gpio_to_irq(GPIOG(0)); //gpio实现虚拟irq
printk("<0>""the irq value is %d\n",irq);
error=request_irq(irq,gpio_key_isr,IRQF_TRIGGER_FALLING|IRQF_TRIGGER_RISING,"KEY_111",NULL); //上升沿下降沿触发
if(error){
printk("<0>""request irq error\n");
}
printk("<0>""the value of error is %d\n",error);
work=kmalloc(sizeof(struct work_struct),GFP_KERNEL);
INIT_WORK(work, work_func);
init_timer(&buttons_timer);
buttons_timer.function=gpio_keys_timer;
add_timer(&buttons_timer);
// key_status=KEYS_UP;
ret = input_register_device(buttons_dev);
if(ret) {
printk("unable to register input device\n");
return -1;
}
printk("gpio_keys init\n");
return 0;
}
static void __exit gpio_keys_exit(void)
{
free_irq(irq,NULL);
gpio_free(GPIOG(0));
del_timer(&buttons_timer);
unregister_chrdev(KEY_MAJOR, DEVICE_NAME);
}
module_init(gpio_keys_init);
module_exit(gpio_keys_exit);
MODULE_LICENSE("GPL");
我做了一个按键唤醒功能的驱动，用的是定时器，上升沿下降沿触发，但是发现还是消不了抖动，请大家帮我看看问题，还有我这个功能是按一下屏幕打开，再按一下屏幕关闭，怎么改成上升沿点亮，下降沿灭掉。
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