sysfs属性组创建例程

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/string.h>

static ssize_t attr_a_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count)
{
	int rec = 0;
	sscanf(buf, "%x", &rec);
	...
   return count;
}


static ssize_t attr_b_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count)
{
	int rec = 0;
	
	sscanf(buf, "%x", &rec);
	...
   return count;
}

static struct kobject *hello_kobj;

struct  mcp23017_control_attribute {
	struct attribute	attr;
	ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
			char *buf);
	ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
			const char *buf, size_t n);
};

static struct  mcp23017_control_attribute hello_attribute[] = {
	__ATTR(attr_a, 0777,	NULL,	attr_a_store),
	__ATTR(attr_b, 0777,	NULL,	attr_b_store),
};


static int __init hello_init(void)
{

	mcp23017_kobj = kobject_create_and_add("hello", NULL);
	for(i=0; i < 2; i++)
	{
		sysfs_create_file(hello_kobj, &hello_attribute[i].attr);
	}	
}

static void __exit hello_exit(void)
{

}

module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("GPL");