1 files changed, 69 insertions, 0 deletions
diff --git a/lib/sysfs_utils.c b/lib/sysfs_utils.c
index 2dcf22a..617311e 100644
--- a/lib/sysfs_utils.c
+++ b/lib/sysfs_utils.c
@@ -285,3 +285,72 @@ struct dlist *sysfs_open_bus_devices_list(unsigned char *name)
 	sysfs_close_directory(dir);
 	return list;
 }
+
+
+/**
+ * sysfs_change_attribute_value: "write" attribute support
+ * @device: bus/class device for which attribute has to be changed
+ * @attribute: attribute thats needs modification
+ * @value: value to change to
+ * returns 0 on success and -1 on error
+ */
+int sysfs_change_attribute_value(unsigned char *device, 
+		unsigned char *attribute, unsigned char *value)
+{
+	struct sysfs_device *dev = NULL;
+	struct sysfs_class_device *clsdev = NULL;
+	struct sysfs_attribute *attrib = NULL;
+	struct dlist *attributes = NULL;
+	char subsys_name[SYSFS_NAME_LEN];
+
+	if (device == NULL || attribute == NULL || value == NULL) {
+		dprintf("Incorrect parameters supplied\n");
+		return -1;
+	}
+
+	dev = sysfs_open_device_by_name(device, subsys_name, SYSFS_NAME_LEN);
+	if (dev != NULL) {
+		attrib = sysfs_get_directory_attribute(dev->directory,
+								attribute);
+		if (attrib == NULL) {
+			dprintf("Attribute %s not defined for device %s\n",
+					attribute, device);
+			sysfs_close_device(dev);
+			return -1;
+		}
+		if ((sysfs_write_attribute(attrib, value)) < 0) {
+			dprintf("Error writing value %s to attribute %s\n",
+					value, attribute);
+			sysfs_close_device(dev);
+			return -1;
+		}
+		return 0;
+	}
+	
+	/* not found in bus subsys - look in class */
+	if ((sysfs_find_device_class_name(device, subsys_name, 
+					SYSFS_NAME_LEN)) < 0) {
+		dprintf("Device %s not found\n", device);
+		return -1;
+	}
+	clsdev = sysfs_open_class_device_by_name(subsys_name, device);
+	if (clsdev != NULL) {
+		attrib = sysfs_get_directory_attribute(clsdev->directory,
+								attribute);
+		if (attrib != NULL) {
+			if ((sysfs_write_attribute(attrib, value)) == 0) {
+				sysfs_close_class_device(clsdev);
+				return 0;
+			}
+			dprintf("Error writing attribute value\n");
+			sysfs_close_class_device(clsdev);
+			return -1;
+		}
+		dprintf("Attribute %s not defined for device %s\n", 
+							attribute, device);
+		return -1;
+	}
+	dprintf("Device %s not found\n", device);
+	return -1;
+}
+