Here are two function patch for libsys which metioned in TODO list, could you please take a look
at it and see whether it can meet the TODO req.

Thanks
Guo Min 
The content of this email message solely contains my own personal views,
and not those of my employer.
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diff -Nuar /udev/libsysfs/libsysfs.h libsysfs/libsysfs.h
--- /udev/libsysfs/libsysfs.h	2003-07-19 03:06:48.000000000 +0800
+++ libsysfs/libsysfs.h	2003-08-05 11:01:29.183292832 +0800
@@ -124,6 +124,9 @@
 extern int sysfs_read_attribute(struct sysfs_attribute *sysattr);
 extern int sysfs_read_attribute_value(const char *attrpath, char *value, 
 								size_t vsize);
+extern int sysfs_write_attribute(struct sysfs_attribute *sysattr,char *value);
+extern int sysfs_write_attribute_value(const char *attrpath, char *value);
+
 extern char *sysfs_get_value_from_attributes(struct sysfs_attribute *attr, 
 							const char * name);
 extern void sysfs_close_directory(struct sysfs_directory *sysdir);
diff -Nuar /udev/libsysfs/sysfs_dir.c libsysfs/sysfs_dir.c
--- /udev/libsysfs/sysfs_dir.c	2003-07-19 03:06:34.000000000 +0800
+++ libsysfs/sysfs_dir.c	2003-08-05 11:18:44.580888472 +0800
@@ -78,6 +78,34 @@
 
 	return sysattr;
 }
+/**
+ * sysfs_write_attribute: write value to the attribute
+ * @sysattr: attribute to write
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_write_attribute(struct sysfs_attribute *sysattr,char  *value)
+{
+	if (sysattr == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	
+	if (!(sysattr->method & SYSFS_METHOD_STORE)) {
+		dprintf (stderr, "Store method not supported for attribute %s\n",
+			sysattr->path);
+		return -1;
+	}
+	
+	if (!value)
+		sysattr->value=value;
+	else
+	{
+		dprintf (stderr, "The value is NULL\n");
+		return -1;
+	}
+	return 0;
+}
+
 
 /**
  * sysfs_read_attribute: reads value from attribute
@@ -134,6 +162,41 @@
 }
 
 /**
+ * sysfs_write_attribute_value: given path to attribute, 
+ * value will be saved to the attribute.
+ * @attrpath: sysfs path to attribute
+ * @value: value to give to attribute
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_write_attribute_value(const char *attrpath, char *value)
+{
+	struct sysfs_attribute *attr = NULL;
+	
+	if (attrpath == NULL || value == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	attr = sysfs_open_attribute(attrpath);
+	if (attr == NULL) {
+		dprintf(stderr, "Invalid attribute path %s\n", attrpath);
+		errno = EINVAL;
+		return -1;
+	}
+	
+	if((sysfs_write_attribute(attr,value)) != 0 ) {
+		dprintf(stderr, "Error write to attribute %s\n", attrpath);
+		sysfs_close_attribute(attr);
+		return -1;
+	}
+
+	sysfs_close_attribute(attr);
+
+	return 0;
+}
+
+
+/**
  * sysfs_read_attribute_value: given path to attribute, return its value.
  *	values can be up to a pagesize, if buffer is smaller the value will 
  *	be truncated.