static struct gpio_keys_button s3c_buttons[] = {
       {
              .code             = KEY_LEFT,    //键值，驱动人员可自己设定，但用户必须知道
              .gpio              = S3C2410_GPG(0),
              .active_low     = 1,          //下降沿触发方式
              .desc              = "key1",
       },
       {
              .code             = KEY_RIGHT,
              .gpio              = S3C2410_GPG(3),
              .active_low     = 1,
              .desc              = "key2",
       },
 
};

static struct gpio_keys_platform_data s3c_button_data = {
       .buttons   = s3c_buttons,
       .nbuttons = ARRAY_SIZE(s3c_buttons),
};

static struct platform_device s3c_button_device = {
       .name             = "gpio-keys",
       .id           = -1,
       .num_resources     = 0,
       .dev        = {
              .platform_data = &s3c_button_data,
       }
};