在linux驱动中添加sys属性

下面是在Linux驱动中添加sys属性的简单介绍

方法一：在驱动中添加如下代码

static int Infrared_detect_info_open = 0;

直接调用module_param_named

module_param_named(infrared_info_switch, Infrared_detect_info_open, int, 0644);

infrared_info_switch为sys文件系统中属性的名字

方法二：在驱动中添加如下代码

static ssize_t infrare_distance_control_store(struct device *dev, struct device_attribute *attr, char *buf)

{

 ssize_t ret = 0;

        int buf_num;

        buf_num=buf[0] - '0';

        if(buf_num >= 1 && buf_num <= 9)

            effective_int_num=buf_num;

 ret = strlen(buf);

 return ret;

}

static ssize_t infrare_distance_control_show(struct device *dev, struct device_attribute *attr, char *buf)

{

 ssize_t ret = 0;

        buf[0] = '0'+effective_int_num;

 ret = strlen(buf);

 return ret;

}

static DEVICE_ATTR(infrare_distance_control, S_IWUGO | S_IRUGO, infrare_distance_control_show, infrare_distance_control_store);

并在模块初始化函数处添加如下代码：

    res = device_create_file(infrared_dev, &dev_attr_infrare_distance_control);

    if (res) {

        pr_err("%s: device_create_file failed\n", __FUNCTION__);

        goto out;     

    }