#ifndef __ASM_ARCH_BUTTONSGPIO_H
#define __ASM_ARCH_BUTTONSGPIO_H "buttons-gpio.h"//定义一个Button设备的数据结构
struct s5pv210_button_platdata
{char            *name;unsigned int    gpio;unsigned int    irqnum;unsigned int    flags;
};#endif

/*Buttons*/static struct s5pv210_button_platdata s5pv210_button_pdata = {.name        = "button1",.gpio        = S5PV210_GPH0(2),.irqnum      = IRQ_EINT2,//中断号.flags       = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,//上升沿触发+下降沿触发
};static struct platform_device s5pv210_button = {.name   = "s5pv210_button",.id     = 1,.dev    = {.platform_data  = &s5pv210_button_pdata,},
};

static struct platform_device *smdkc110_devices[] __initdata =
{......&s5pv210_button,};

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/input.h> #include <mach/buttons_gpio.h>
#include <mach/hardware.h>
#include <mach/regs-gpio.h>
#include <mach/irqs.h>
#include <linux/interrupt.h>static struct s5pv210_button_platdata *pdata;
static struct input_dev *button_dev = NULL;static irqreturn_t button_interrupt(int irq, void *dummy)
{ int flag;s3c_gpio_cfgpin(pdata->gpio, S3C_GPIO_SFN(0x0)); //设置GPIO为input模式flag = gpio_get_value(pdata->gpio);              //读取GPIO的值s3c_gpio_cfgpin(pdata->gpio, S3C_GPIO_SFN(0x0f));//设置GPIO为eint2模式
input_report_key(button_dev, KEY_LEFT, !flag);   //上报事件input_sync(button_dev);                          //同步事件return IRQ_HANDLED;
}static int s5pv210_button_remove(struct platform_device *dev)
{input_free_device(button_dev);            //释放button_dev内存free_irq(pdata->irqnum, button_interrupt);//释放中断资源gpio_free(pdata->gpio);                   //释放GPIOreturn 0;
}static int s5pv210_button_probe(struct platform_device *dev)
{int ret;pdata = dev->dev.platform_data;/*****************************申请资源******************************///申请GPIOret = gpio_request(pdata->gpio, pdata->name);if (ret) {printk(KERN_ERR "gpio_request failed, ret = %d.\n", ret);return -EBUSY;} //申请IRQif (request_irq(pdata->irqnum, button_interrupt, pdata->flags, pdata->name, NULL)) { printk(KERN_ERR "key-s5pv210.c: Can't allocate irq %d\n", pdata->irqnum);ret = -EBUSY;goto ERR_STER0;}/************************初始化GPIO资源*************************/s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_UP); //设置GPIO为上拉模式s3c_gpio_cfgpin(pdata->gpio, S3C_GPIO_SFN(0x0f));//设置GPIO为eint模式/*******************************创建接口*******************************///申请button_dev内存空间button_dev = input_allocate_device();if(!button_dev){ret = -ENOMEM;goto ERR_STER1;}//初始化button_devset_bit(EV_KEY, button_dev->evbit);    //支持EV_KEY事件set_bit(KEY_LEFT, button_dev->keybit); //支持KEY_LEFT子事件//注册button_devif(input_register_device(button_dev) != 0){printk("s5pv210-button input register device fail!!\n");ret = -ENODEV;goto ERR_STER2;}return 0;/****************************倒映式错误处理****************************/
ERR_STER2:input_free_device(button_dev);ERR_STER1:free_irq(pdata->irqnum, button_interrupt);ERR_STER0:gpio_free(pdata->gpio);return ret;
}//定义并初始化驱动信息
static struct platform_driver s5pv210_button_driver =
{.probe        = s5pv210_button_probe,.remove        = s5pv210_button_remove,.driver        = {.name    = "s5pv210_button",.owner    = THIS_MODULE,},
};//注册驱动
static int __init s5pv210_button_init(void)
{return platform_driver_register(&s5pv210_button_driver);
}//注销驱动
static void __exit s5pv210_button_exit(void)
{platform_driver_unregister(&s5pv210_button_driver);
}module_init(s5pv210_button_init);
module_exit(s5pv210_button_exit);MODULE_AUTHOR("Lin");
MODULE_DESCRIPTION("S5PV210 BUTTON driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s5pv210_button");

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <string.h>#define X210_KEY            "/dev/input/event1"int main(void)
{int fd = -1, ret = -1;struct input_event ev;//打开设备文件fd = open(X210_KEY, O_RDONLY);if (fd < 0){perror("open");return -1;}while (1){//读取一个event事件包memset(&ev, 0, sizeof(struct input_event));ret = read(fd, &ev, sizeof(struct input_event));if (ret != sizeof(struct input_event)){perror("read");close(fd);return -1;}//解析event包printf("-------------------------\n");printf("type: %hd\n", ev.type);printf("code: %hd\n", ev.code);printf("value: %d\n", ev.value);printf("\n");}//关闭设备
    close(fd);return 0;
}

-------------------------//按键按下
type: 1
code: 105
value: 1-------------------------//同步事件
type: 0
code: 0
value: 0-------------------------//按键弹起
type: 1
code: 105
value: 0-------------------------//同步事件
type: 0
code: 0
value: 0