Initial revision

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diff --git a/lib/LGPL b/lib/LGPL
new file mode 100644
index 0000000..e00a829
--- /dev/null
+++ b/lib/LGPL
@@ -0,0 +1,441 @@
+      
+      GNU Lesser Public License
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+
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diff --git a/lib/Makefile b/lib/Makefile
new file mode 100644
index 0000000..cf07a84
--- /dev/null
+++ b/lib/Makefile
@@ -0,0 +1,44 @@
+# Makefile for libsysfs.a
+# Copyright (c) International Business Machines Corp., 2003
+
+CC=gcc
+
+H_INCLUDE=../include
+LIB_INCLUDE=.
+OBJS=sysfs_bus.o sysfs_class.o sysfs_device.o sysfs_dir.o sysfs_driver.o \
+	sysfs_utils.o
+
+# Install directory
+
+# Options
+CFLAGS=-O2 -Wall -ansi -g
+
+# sysfs library
+LIBSYSFS=libsysfs.a
+
+RM=rm -f
+
+libsysfs.a: $(OBJS)
+	ar cru $(LIBSYSFS) $(OBJS)
+	ranlib $(LIBSYSFS)
+
+sysfs_bus.o: sysfs_bus.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_bus.c
+
+sysfs_class.o: sysfs_class.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_class.c
+
+sysfs_device.o: sysfs_device.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_device.c
+
+sysfs_dir.o: sysfs_dir.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_dir.c
+
+sysfs_driver.o: sysfs_driver.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_driver.c
+
+sysfs_utils.o: sysfs_utils.c
+	$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_utils.c
+
+clean:
+	$(RM) *.o *~ core $(LIBSYSFS)
diff --git a/lib/sysfs.h b/lib/sysfs.h
new file mode 100644
index 0000000..eb2a002
--- /dev/null
+++ b/lib/sysfs.h
@@ -0,0 +1,49 @@
+/*
+ * sysfs.h
+ *
+ * Internal Header Definitions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#ifndef _SYSFS_H_
+#define _SYSFS_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <mntent.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/* external library functions */
+extern int lstat(const char *file_name, struct stat *buf);
+extern int readlink(const char *path, char *buf, size_t bufsize);
+extern int getpagesize(void);
+extern int isascii(int c);
+
+/* Debugging */
+#ifdef DEBUG
+#define dprintf(format, arg...) fprintf(stderr, format, ## arg)
+#else
+#define dprintf(format, arg...) do { } while (0)
+#endif
+
+#endif /* _SYSFS_H_ */
diff --git a/lib/sysfs_bus.c b/lib/sysfs_bus.c
new file mode 100644
index 0000000..c7b6036
--- /dev/null
+++ b/lib/sysfs_bus.c
@@ -0,0 +1,301 @@
+/*
+ * sysfs_bus.c
+ *
+ * Generic bus utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_bus: close single bus
+ * @bus: bus structure
+ */
+void sysfs_close_bus(struct sysfs_bus *bus)
+{
+	struct sysfs_device *curdev = NULL, *nextdev = NULL;
+	struct sysfs_driver *curdrv = NULL, *nextdrv = NULL;
+
+	if (bus != NULL) {
+		if (bus->directory != NULL)
+			sysfs_close_directory(bus->directory);
+		for (curdev = bus->devices; curdev != NULL;
+		     curdev = nextdev) {
+			nextdev = curdev->next;
+			sysfs_close_device(curdev);
+		}
+		for (curdrv = bus->drivers; curdrv != NULL;
+		     curdrv = nextdrv) {
+			nextdrv = curdrv->next;
+			sysfs_close_driver(curdrv);
+		}
+		free(bus);
+	}
+}
+
+/**
+ * alloc_bus: mallocs new bus structure
+ * returns sysfs_bus_bus struct or NULL
+ */
+static struct sysfs_bus *alloc_bus(void)
+{
+	return (struct sysfs_bus *)calloc(1, sizeof(struct sysfs_bus));
+}
+
+/**
+ * open_bus_dir: opens up sysfs bus directory
+ * returns sysfs_directory struct with success and NULL with error
+ */
+static struct sysfs_directory *open_bus_dir(const char *name)
+{
+	struct sysfs_directory *busdir = NULL, *cur = NULL, *next = NULL;
+	char buspath[SYSFS_PATH_MAX];
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(buspath, 0, SYSFS_PATH_MAX);
+	if ((sysfs_get_mnt_path(buspath, SYSFS_PATH_MAX)) != 0) {
+		dprintf(stderr, "Sysfs not supported on this system\n");
+		return NULL;
+	}
+
+	strcat(buspath, SYSFS_BUS_DIR);
+	strcat(buspath, "/");
+	strcat(buspath, name);
+	busdir = sysfs_open_directory(buspath);
+	if (busdir == NULL) {
+		errno = EINVAL;
+		dprintf(stderr,"Bus %s not supported on this system\n",
+			name);
+		return NULL;
+	}
+	if ((sysfs_read_directory(busdir)) != 0) {
+		dprintf(stderr, "Error reading %s bus dir %s\n", name, 
+			buspath);
+		sysfs_close_directory(busdir);
+		return NULL;
+	}
+	/* read in devices and drivers subdirs */
+	for (cur = busdir->subdirs; cur != NULL; cur = next) {
+		next = cur->next;
+		if ((sysfs_read_directory(cur)) != 0)
+			continue;
+	}
+
+	return busdir;
+}
+
+/**
+ * add_dev_to_bus: adds a bus device to bus device list
+ * @bus: bus to add the device
+ * @dev: device to add
+ */
+static void add_dev_to_bus(struct sysfs_bus *bus, struct sysfs_device *dev)
+{
+	if (bus != NULL && dev != NULL) {
+		dev->next = bus->devices;
+		bus->devices = dev;
+	}
+}
+
+/**
+ * add_driver_to_bus: adds a bus driver to bus driver list
+ * @bus: bus to add driver to
+ * @driver: driver to add
+ */
+static void add_driver_to_bus(struct sysfs_bus *bus, 
+				struct sysfs_driver *driver)
+{
+	if (bus != NULL && driver != NULL) {
+		driver->next = bus->drivers;
+		bus->drivers = driver;
+	}
+}
+
+/**
+ * get_all_bus_devices: gets all devices for bus
+ * @bus: bus to get devices for
+ * returns 0 with success and -1 with failure
+ */
+static int get_all_bus_devices(struct sysfs_bus *bus)
+{
+	struct sysfs_device *bdev = NULL;
+	struct sysfs_directory *cur = NULL;
+	struct sysfs_link *curl = NULL, *nextl = NULL;
+	char dirname[SYSFS_NAME_LEN];
+
+	if (bus == NULL || bus->directory == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	for (cur = bus->directory->subdirs; cur != NULL; cur = cur->next) {
+		memset(dirname, 0, SYSFS_NAME_LEN);
+		if ((sysfs_get_name_from_path(cur->path, dirname,
+		    SYSFS_NAME_LEN)) != 0)
+			continue;
+		if (strcmp(dirname, SYSFS_DEVICES_NAME) != 0)
+			continue;
+		for (curl = cur->links; curl != NULL; curl = nextl) {
+			nextl = curl->next;
+			bdev = sysfs_open_device(curl->target);
+			if (bdev == NULL) {
+				dprintf(stderr, "Error opening device at %s\n",
+					curl->target);
+				continue;
+			}
+			add_dev_to_bus(bus, bdev);
+		}
+	}
+			
+	return 0;
+}
+
+/**
+ * get_all_bus_drivers: get all pci drivers
+ * @bus: pci bus to add drivers to
+ * returns 0 with success and -1 with error
+ */
+static int get_all_bus_drivers(struct sysfs_bus *bus)
+{
+	struct sysfs_driver *driver = NULL;
+	struct sysfs_directory *cur = NULL, *next = NULL;
+	struct sysfs_directory *cursub = NULL, *nextsub = NULL;
+	char dirname[SYSFS_NAME_LEN];
+
+	if (bus == NULL || bus->directory == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	for (cur = bus->directory->subdirs; cur != NULL; cur = next) {
+		next = cur->next;
+		memset(dirname, 0, SYSFS_NAME_LEN);
+		if ((sysfs_get_name_from_path(cur->path, dirname,
+		    SYSFS_NAME_LEN)) != 0)
+			continue;
+		if (strcmp(dirname, SYSFS_DRIVERS_NAME) != 0)
+			continue;
+		for (cursub = cur->subdirs; cursub != NULL; cursub = nextsub) {
+			nextsub = cursub->next;
+			driver = sysfs_open_driver(cursub->path);
+			if (driver == NULL) {
+				dprintf(stderr, "Error opening driver at %s\n",
+					cursub->path);
+				continue;
+			}
+			add_driver_to_bus(bus, driver);
+		}
+	}
+	
+	return 0;
+}
+
+/**
+ * match_bus_device_to_driver: returns 1 if device is bound to driver
+ * @driver: driver to match
+ * @busid: busid of device to match
+ * returns 1 if found and 0 if not found
+ */
+static int match_bus_device_to_driver(struct sysfs_driver *driver, char *busid)
+{
+	struct sysfs_link *cur = NULL, *next = NULL;
+	int found = 0;
+
+	if (driver == NULL || driver->directory == NULL || busid == NULL) {
+		errno = EINVAL;
+		return found;
+	}
+	for (cur = driver->directory->links; cur != NULL && found == 0;
+	     cur = next) {
+		next = cur->next;
+		if ((strcmp(cur->name, busid)) == 0)
+			found++;
+	}
+	return found;
+}
+
+/**
+ * link_bus_devices_to_drivers: goes through and links devices to drivers
+ * @bus: bus to link
+ */
+static void link_bus_devices_to_drivers(struct sysfs_bus *bus)
+{
+	struct sysfs_device *dev = NULL, *nextdev = NULL;
+	struct sysfs_driver *drv = NULL, *nextdrv = NULL;
+	
+	if (bus != NULL && bus->devices != NULL && bus->drivers != NULL) {
+		for (dev = bus->devices; dev != NULL; dev = nextdev) {
+			nextdev = dev->next;
+
+			for (drv = bus->drivers; drv != NULL; drv = nextdrv) {
+				nextdrv = drv->next;
+				if ((match_bus_device_to_driver(drv, 
+				    dev->bus_id)) != 0) {
+					dev->driver = drv;
+					drv->device = dev;
+				}
+			}
+		}
+	}
+}
+
+/**
+ * sysfs_open_bus: opens specific bus and all its devices on system
+ * returns sysfs_bus structure with success or NULL with error.
+ */
+struct sysfs_bus *sysfs_open_bus(const char *name)
+{
+	struct sysfs_bus *bus = NULL;
+	struct sysfs_directory *busdir = NULL;
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	bus = alloc_bus();
+	if (bus == NULL) {
+		perror("malloc");
+		return NULL;
+	}
+	strcpy(bus->name, name);	
+	busdir = open_bus_dir(name);
+	if (busdir == NULL) {
+		dprintf(stderr,"Invalid bus, %s not supported on this system\n",
+			name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	bus->directory = busdir;
+	if ((get_all_bus_devices(bus)) != 0) {
+		dprintf(stderr, "Error reading %s bus devices\n", name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	if ((get_all_bus_drivers(bus)) != 0) {
+		dprintf(stderr, "Error reading %s bus drivers\n", name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	link_bus_devices_to_drivers(bus);
+
+	return bus;
+}
diff --git a/lib/sysfs_class.c b/lib/sysfs_class.c
new file mode 100644
index 0000000..dee8514
--- /dev/null
+++ b/lib/sysfs_class.c
@@ -0,0 +1,270 @@
+/*
+ * sysfs_class.c
+ *
+ * Generic class utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_class_device: closes a single class device.
+ * @dev: class device to close.
+ */
+void sysfs_close_class_device(struct sysfs_class_device *dev)
+{
+	if (dev != NULL) {
+		if (dev->directory != NULL)
+			sysfs_close_directory(dev->directory);
+		if (dev->sysdevice != NULL)
+			sysfs_close_device(dev->sysdevice);
+		if (dev->driver != NULL)
+			sysfs_close_driver(dev->driver);
+		free(dev);
+	}
+}
+
+/**
+ * sysfs_close_class: close single class
+ * @class: class structure
+ */
+void sysfs_close_class(struct sysfs_class *cls)
+{
+	struct sysfs_class_device *cur = NULL, *next = NULL;
+
+	if (cls != NULL) {
+		if (cls->directory != NULL)
+			sysfs_close_directory(cls->directory);
+		for (cur = cls->devices; cur != NULL; cur = next) {
+			next = cur->next;
+			sysfs_close_class_device(cur);
+		}
+		free(cls);
+	}
+}
+
+/**
+ * alloc_class_device: mallocs and initializes new class device struct.
+ * returns sysfs_class_device or NULL.
+ */
+static struct sysfs_class_device *alloc_class_device(void)
+{
+	return (struct sysfs_class_device *)
+				calloc(1, sizeof(struct sysfs_class_device));
+}
+
+/**
+ * alloc_class: mallocs new class structure
+ * returns sysfs_class struct or NULL
+ */
+static struct sysfs_class *alloc_class(void)
+{
+	return (struct sysfs_class *)calloc(1, sizeof(struct sysfs_class));
+}
+
+/**
+ * open_class_dir: opens up sysfs class directory
+ * returns sysfs_directory struct with success and NULL with error
+ */
+static struct sysfs_directory *open_class_dir(const char *name)
+{
+	struct sysfs_directory *classdir = NULL;
+	char classpath[SYSFS_PATH_MAX];
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(classpath, 0, SYSFS_PATH_MAX);
+	if ((sysfs_get_mnt_path(classpath, SYSFS_PATH_MAX)) != 0) {
+		dprintf(stderr, "Sysfs not supported on this system\n");
+		return NULL;
+	}
+
+	strcat(classpath, SYSFS_CLASS_DIR);
+	strcat(classpath, "/");
+	strcat(classpath, name);
+	classdir = sysfs_open_directory(classpath);
+	if (classdir == NULL) {
+		errno = EINVAL;
+		dprintf(stderr,"Class %s not supported on this system\n",
+			name);
+		return NULL;
+	}
+	if ((sysfs_read_directory(classdir)) != 0) {
+		dprintf(stderr, "Error reading %s class dir %s\n", name, 
+			classpath);
+		sysfs_close_directory(classdir);
+		return NULL;
+	}
+
+	return classdir;
+}
+
+/**
+ * sysfs_open_class_device: Opens and populates class device
+ * @path: path to class device.
+ * returns struct sysfs_class_device with success and NULL with error.
+ */
+struct sysfs_class_device *sysfs_open_class_device(const char *path)
+{
+	struct sysfs_class_device *cdev = NULL;
+	struct sysfs_directory *dir = NULL, *cur = NULL;
+	struct sysfs_link *curl = NULL;
+	struct sysfs_device *sdev = NULL;
+	struct sysfs_driver *drv = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	cdev = alloc_class_device();
+	if (cdev == NULL) {
+		perror("malloc");
+		return NULL;
+	}
+	if ((sysfs_get_name_from_path(path, cdev->name, SYSFS_NAME_LEN)) != 0) {
+		errno = EINVAL;
+		dprintf(stderr, "Invalid class device path %s\n", path);
+		sysfs_close_class_device(cdev);
+		return NULL;
+	}
+
+	dir = sysfs_open_directory(path);
+	if (dir == NULL) {
+		dprintf(stderr, "Error opening class device at %s\n", path);
+		sysfs_close_class_device(cdev);
+		return NULL;
+	}
+	if ((sysfs_read_directory(dir)) != 0) {
+		dprintf(stderr, "Error reading class device at %s\n", path);
+		sysfs_close_directory(dir);
+		sysfs_close_class_device(cdev);
+		return NULL;
+	}
+	cdev->directory = dir;
+
+	cur = cdev->directory->subdirs;
+	while(cur != NULL) {
+		sysfs_read_directory(cur);
+		cur = cur->next;
+	}
+	/* get driver and device, if implemented */
+	curl = cdev->directory->links;
+	while (curl != NULL) {
+		if (strncmp(curl->name, SYSFS_DEVICES_NAME, 6) == 0) {
+			sdev = sysfs_open_device(curl->target);
+			if (sdev != NULL) {
+				cdev->sysdevice = sdev;
+				if (cdev->driver != NULL) 
+					sdev->driver = cdev->driver;
+			}
+		} else if (strncmp(curl->name, SYSFS_DRIVERS_NAME, 6) == 0) {
+			drv = sysfs_open_driver(curl->target);
+			if (drv != NULL) {
+				cdev->driver = drv;
+				if (cdev->sysdevice != NULL) 
+					drv->device = cdev->sysdevice;
+			}
+		}
+		curl = curl->next;
+	}
+	return cdev;
+}
+
+/**
+ * add_dev_to_class: adds a class device to class list
+ * @class: class to add the device
+ * @dev: device to add
+ */
+static void add_dev_to_class(struct sysfs_class *cls, 
+					struct sysfs_class_device *dev)
+{
+	if (cls != NULL && dev != NULL) {
+		dev->next = cls->devices;
+		cls->devices = dev;
+	}
+}
+
+/**
+ * get_all_class_devices: gets all devices for class
+ * @class: class to get devices for
+ * returns 0 with success and -1 with failure
+ */
+static int get_all_class_devices(struct sysfs_class *cls)
+{
+	struct sysfs_class_device *dev = NULL;
+	struct sysfs_directory *cur = NULL, *next = NULL;
+
+	if (cls == NULL || cls->directory == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	for (cur = cls->directory->subdirs; cur != NULL; cur = next) {
+		next = cur->next;
+		dev = sysfs_open_class_device(cur->path);
+		if (dev == NULL) {
+			dprintf(stderr, "Error opening device at %s\n",
+				cur->path);
+			continue;
+		}
+		add_dev_to_class(cls, dev);
+	}
+			
+	return 0;
+}
+
+/**
+ * sysfs_open_class: opens specific class and all its devices on system
+ * returns sysfs_class structure with success or NULL with error.
+ */
+struct sysfs_class *sysfs_open_class(const char *name)
+{
+	struct sysfs_class *cls = NULL;
+	struct sysfs_directory *classdir = NULL;
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	cls = alloc_class();
+	if (cls == NULL) {
+		perror("malloc");
+		return NULL;
+	}
+	strcpy(cls->name, name);	
+	classdir = open_class_dir(name);
+	if (classdir == NULL) {
+		dprintf(stderr,
+			"Invalid class, %s not supported on this system\n",
+			name);
+		sysfs_close_class(cls);
+		return NULL;
+	}
+	cls->directory = classdir;
+	if ((get_all_class_devices(cls)) != 0) {
+		dprintf(stderr, "Error reading %s class devices\n", name);
+		sysfs_close_class(cls);
+		return NULL;
+	}
+
+	return cls;
+}
diff --git a/lib/sysfs_device.c b/lib/sysfs_device.c
new file mode 100644
index 0000000..185b5cf
--- /dev/null
+++ b/lib/sysfs_device.c
@@ -0,0 +1,199 @@
+/*
+ * sysfs_device.c
+ *
+ * Generic device utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_device: closes and cleans up a device
+ * @dev = device to clean up
+ */
+void sysfs_close_device(struct sysfs_device *dev)
+{
+	if (dev != NULL) {
+		dev->next = NULL;
+		dev->driver = NULL;
+		if (dev->directory != NULL)
+			sysfs_close_directory(dev->directory);
+		dev->children = NULL;
+		free(dev);
+	}
+}
+
+/**
+ * alloc_device: allocates and initializes device structure
+ * returns struct sysfs_device
+ */
+static struct sysfs_device *alloc_device(void)
+{
+	return (struct sysfs_device *)calloc(1, sizeof(struct sysfs_device));
+}
+
+/**
+ * sysfs_get_device_attr: searches dev's attributes by name
+ * @dev: device to look through
+ * @name: attribute name to get
+ * returns sysfs_attribute reference with success or NULL with error.
+ */
+struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
+						const char *name)
+{
+	struct sysfs_attribute *cur = NULL;
+	char attrname[SYSFS_NAME_LEN];
+
+	if (dev == NULL || dev->directory == NULL || name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	for (cur = dev->directory->attributes; cur != NULL; cur = cur->next) {
+		if ((sysfs_get_name_from_path(cur->path, attrname, 
+		    SYSFS_NAME_LEN)) != 0) 
+			continue;
+		if (strcmp(name, attrname) != 0)
+			continue;
+
+		return cur;
+	}
+
+	return NULL;
+}
+
+/**
+ * sysfs_open_device: opens and populates device structure
+ * @path: path to device, this is the /sys/devices/ path
+ * returns sysfs_device structure with success or NULL with error
+ */
+struct sysfs_device *sysfs_open_device(const char *path)
+{
+	struct sysfs_device *dev = NULL;
+	struct sysfs_directory *sdir = NULL;
+	char *p = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	dev = alloc_device();	
+	if (dev == NULL) {
+		dprintf(stderr, "Error allocating device at %s\n", path);
+		return NULL;
+	}
+	sdir = sysfs_open_directory(path);
+	if (sdir == NULL) {
+		dprintf(stderr, "Invalid device at %s\n", path);
+		errno = EINVAL;
+		sysfs_close_device(dev);
+		return NULL;
+	}
+	if ((sysfs_read_directory(sdir)) != 0) {
+		dprintf(stderr, "Error reading device directory at %s\n", path);
+		sysfs_close_directory(sdir);
+		sysfs_close_device(dev);
+		return NULL;
+	}
+	dev->directory = sdir;
+	sysfs_get_name_from_path(sdir->path, dev->bus_id, SYSFS_NAME_LEN);
+	/* get device name */
+	p = sysfs_get_value_from_attributes(sdir->attributes,	
+							SYSFS_NAME_ATTRIBUTE);
+	if (p != NULL) {
+		strncpy(dev->name, p, SYSFS_NAME_LEN);
+		p = dev->name + strlen(dev->name) - 1;
+		if ((strlen(dev->name) > 0) && *p == '\n')
+			*p = '\0';
+	}
+
+	return dev;
+}
+
+/**
+ * sysfs_close_device_tree: closes every device in the supplied tree, 
+ * 	closing children only.
+ * @devroot: device root of tree.
+ */
+void sysfs_close_device_tree(struct sysfs_device *devroot)
+{
+	if (devroot != NULL) {
+		if (devroot->children != NULL) {
+			struct sysfs_device *child = NULL, *next = NULL;
+	
+			for (child = devroot->children; child != NULL;
+			     child = next) {
+				next = child->next;
+				sysfs_close_device_tree(child);
+			}
+		}
+		sysfs_close_device(devroot);
+	}
+}
+
+/**
+ * add_device_child_to_parent: adds child device to parent
+ * @parent: parent device.
+ * @child: child device to add.
+ */
+static void add_device_child_to_parent(struct sysfs_device *parent,
+					struct sysfs_device *child)
+{
+	if (parent != NULL && child != NULL) {
+		child->next = parent->children;
+		parent->children = child;
+		child->parent = parent;
+	}
+}
+
+/**
+ * sysfs_open_device_tree: opens root device and all of its children,
+ *	creating a tree of devices. Only opens children.
+ * @path: sysfs path to devices
+ * returns struct sysfs_device and its children with success or NULL with
+ *	error.
+ */
+struct sysfs_device *sysfs_open_device_tree(const char *path)
+{
+	struct sysfs_device *rootdev = NULL, *new = NULL;
+	struct sysfs_directory *cur = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	rootdev = sysfs_open_device(path);
+	if (rootdev == NULL) {
+		dprintf(stderr, "Error opening root device at %s\n", path);
+		return NULL;
+	}
+	cur = rootdev->directory->subdirs;
+	while (cur != NULL) {
+		new = sysfs_open_device_tree(cur->path);
+		if (new == NULL) {
+			dprintf(stderr, "Error opening device tree at %s\n",
+				cur->path);
+			sysfs_close_device_tree(rootdev);
+			return NULL;
+		}
+		add_device_child_to_parent(rootdev, new);	
+		cur = cur->next;
+	}
+
+	return rootdev;
+}
diff --git a/lib/sysfs_dir.c b/lib/sysfs_dir.c
new file mode 100644
index 0000000..e6ad906
--- /dev/null
+++ b/lib/sysfs_dir.c
@@ -0,0 +1,453 @@
+/*
+ * syfs_dir.c
+ *
+ * Directory utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_attribute: closes and cleans up attribute
+ * @sysattr: attribute to close.
+ */
+void sysfs_close_attribute(struct sysfs_attribute *sysattr)
+{
+	if (sysattr != NULL) {
+		if (sysattr->value != NULL)
+			free(sysattr->value);
+		free(sysattr);
+	}
+}
+
+/**
+ * alloc_attribute: allocates and initializes attribute structure
+ * returns struct sysfs_attribute with success and NULL with error.
+ */
+static struct sysfs_attribute *alloc_attribute(void)
+{
+	return (struct sysfs_attribute *)
+			calloc(1, sizeof(struct sysfs_attribute));
+}
+
+/**
+ * sysfs_open_attribute: creates sysfs_attribute structure
+ * @path: path to attribute.
+ * returns sysfs_attribute struct with success and NULL with error.
+ */
+struct sysfs_attribute *sysfs_open_attribute(const char *path)
+{
+	struct sysfs_attribute *sysattr = NULL;
+	struct stat fileinfo;
+	
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	sysattr = alloc_attribute();
+	if (sysattr == NULL) {
+		dprintf(stderr, "Error allocating attribute at %s\n", path);
+		return NULL;
+	}
+	strncpy(sysattr->path, path, sizeof(sysattr->path));
+	if ((stat(sysattr->path, &fileinfo)) != 0) {
+		perror("stat");
+		sysattr->method = 0;
+	} else {
+		if (fileinfo.st_mode & S_IRUSR)
+			sysattr->method |= SYSFS_METHOD_SHOW;
+		if (fileinfo.st_mode & S_IWUSR)
+			sysattr->method |= SYSFS_METHOD_STORE;
+	}
+
+	return sysattr;
+}
+
+/**
+ * sysfs_read_attribute: reads value from attribute
+ * @sysattr: attribute to read
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_attribute(struct sysfs_attribute *sysattr)
+{
+	char *fbuf = NULL;
+	char *vbuf = NULL;
+	size_t length = 0;
+	int pgsize = 0;
+	int fd;
+
+	if (sysattr == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (!(sysattr->method & SYSFS_METHOD_SHOW)) {
+		dprintf (stderr, "Show method not supported for attribute %s\n",
+			sysattr->path);
+		return -1;
+	}
+	pgsize = getpagesize();
+	fbuf = (char *)calloc(1, pgsize+1);
+	if (fbuf == NULL) {
+		perror("calloc");
+		return -1;
+	}
+	if ((fd = open(sysattr->path, O_RDONLY)) < 0) {
+		dprintf (stderr, "Error reading attribute %s\n", sysattr->path);
+		free(fbuf);
+		return -1;
+	}
+	length = read(fd, fbuf, pgsize);
+	if (length < 0) {
+		dprintf (stderr, "Error reading from attribute %s\n",
+			sysattr->path);
+		close(fd);
+		free(fbuf);
+		return -1;
+	}
+	sysattr->len = length;
+	close(fd);
+	vbuf = (char *)realloc(fbuf, length+1);
+	if (vbuf == NULL) {
+		perror("realloc");
+		free(fbuf);
+		return -1;
+	}
+	sysattr->value = vbuf;
+
+	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. 
+ * @attrpath: sysfs path to attribute
+ * @value: buffer to put value
+ * @vsize: size of value buffer
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_attribute_value(const char *attrpath, char *value, size_t vsize)
+{
+	struct sysfs_attribute *attr = NULL;
+	size_t length = 0;
+
+	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_read_attribute(attr)) != 0 || attr->value == NULL) {
+		dprintf(stderr, "Error reading from attribute %s\n", attrpath);
+		sysfs_close_attribute(attr);
+		return -1;
+	}
+	length = strlen(attr->value);
+	if (length > vsize) 
+		dprintf(stderr, 
+			"Value length %d is larger than supplied buffer %d\n",
+			length, vsize);
+	strncpy(value, attr->value, vsize);
+	sysfs_close_attribute(attr);
+
+	return 0;
+}
+
+/**
+ * sysfs_get_value_from_attrbutes: given a linked list of attributes and an 
+ * 	attribute name, return its value
+ * @attr: attribute to search
+ * @name: name to look for
+ * returns char * value - could be NULL
+ */
+char *sysfs_get_value_from_attributes(struct sysfs_attribute *attr, 
+					const char *name)
+{	
+	struct sysfs_attribute *cur = NULL;
+	char tmpname[SYSFS_NAME_LEN];
+	
+	if (attr == NULL || name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}	
+	cur = attr;
+	while (cur != NULL) {
+		memset(tmpname, 0, SYSFS_NAME_LEN);	
+		if ((sysfs_get_name_from_path(cur->path, tmpname,
+		    SYSFS_NAME_LEN)) != 0) {
+			cur = cur->next;
+			continue;
+		}
+		if (strcmp(tmpname, name) == 0)
+			return cur->value;
+		cur = cur->next;
+	}
+	return NULL;
+}
+
+/**
+ * add_subdir_to_dir: adds subdirectory to directory's subdirs
+ * @sysdir: directory to add subdir to
+ * @subdir: subdirectory to add.
+ */
+static void add_subdir_to_dir(struct sysfs_directory *sysdir, 
+		     struct sysfs_directory *subdir)
+{
+	if (sysdir != NULL && subdir != NULL) {
+		subdir->next = sysdir->subdirs;
+		sysdir->subdirs = subdir;
+	}
+}
+
+/**
+ * add_attr_to_dir: adds attribute to directory's attributes
+ * @sysdir: directory to add attribute to
+ * @sysattr: attribute to add.
+ */
+static void add_attr_to_dir(struct sysfs_directory *sysdir, 
+		     			struct sysfs_attribute *sysattr)
+{
+	if (sysdir != NULL && sysattr != NULL) {
+		sysattr->next = sysdir->attributes;
+		sysdir->attributes = sysattr;
+	}
+}
+
+/**
+ * sysfs_close_link: closes and cleans up link.
+ * @ln: link to close.
+ */
+void sysfs_close_link(struct sysfs_link *ln)
+{
+	if (ln != NULL) {
+		ln->next = NULL;
+		free(ln);
+	}
+}
+
+/**
+ * add_link_to_dir: adds link to directory's links list.
+ * @sysdir: directory to add it to.
+ * @ln: link to add.
+ */
+static void add_link_to_dir(struct sysfs_directory *sysdir, 
+					struct sysfs_link *ln)
+{
+	if (sysdir != NULL && ln != NULL) {
+		ln->next = sysdir->links;
+		sysdir->links = ln;
+	}
+}
+
+/**
+ * sysfs_close_directory: closes directory, cleans up attributes and links
+ * @sysdir: sysfs_directory to close
+ */
+void sysfs_close_directory(struct sysfs_directory *sysdir)
+{
+	struct sysfs_directory *sdir = NULL, *dnext = NULL;
+	struct sysfs_link *dlink = NULL, *nextl = NULL;
+	struct sysfs_attribute *attr = NULL, *anext = NULL;
+
+	if (sysdir != NULL) {
+		if (sysdir->subdirs != NULL) {
+			for (sdir = sysdir->subdirs; sdir != NULL;
+			     sdir = dnext) {
+				dnext = sdir->next;
+				sysfs_close_directory(sdir);
+			}
+		}
+		if (sysdir->links != NULL) {
+			for (dlink = sysdir->links; dlink != NULL;
+			    dlink = nextl) {
+				nextl = dlink->next;
+				sysfs_close_link(dlink);
+			}
+		}
+		if (sysdir->attributes != NULL) {
+			for (attr = sysdir->attributes; attr != NULL;
+			     attr = anext) {
+				anext = attr->next;
+				/* sysfs_close_attribute(attr); */
+				if (attr->value != NULL)
+					free(attr->value);
+				free(attr);
+			}
+		}
+		free(sysdir);
+	}
+}
+
+/**
+ * alloc_directory: allocates and initializes directory structure
+ * returns struct sysfs_directory with success or NULL with error.
+ */
+static struct sysfs_directory *alloc_directory(void)
+{
+	return (struct sysfs_directory *)
+			calloc(1, sizeof(struct sysfs_directory));
+}
+
+/**
+ * alloc_link: allocates and initializes link structure
+ * returns struct sysfs_link with success or NULL with error.
+ */
+static struct sysfs_link *alloc_link(void)
+{
+	return (struct sysfs_link *)calloc(1, sizeof(struct sysfs_link));
+}
+
+/**
+ * sysfs_open_directory: opens a sysfs directory, creates dir struct, and
+ *		returns.
+ * @path: path of directory to open.
+ * returns: struct sysfs_directory * with success and NULL on error.
+ */
+struct sysfs_directory *sysfs_open_directory(const char *path)
+{
+	struct sysfs_directory *sdir = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	sdir = alloc_directory();
+	if (sdir == NULL) {
+		dprintf(stderr, "Error allocating directory %s\n", path);
+		return NULL;
+	}
+	strncpy(sdir->path, path, sizeof(sdir->path));
+
+	return sdir;
+}
+
+/**
+ * sysfs_open_link: opens a sysfs link, creates struct, and returns
+ * @path: path of link to open.
+ * returns: struct sysfs_link * with success and NULL on error.
+ */
+struct sysfs_link *sysfs_open_link(const char *linkpath)
+{
+	struct sysfs_link *ln = NULL;
+
+	if (linkpath == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	ln = alloc_link();
+	if (ln == NULL) {
+		dprintf(stderr, 
+			"Error allocating link %s\n", linkpath);
+		return NULL;
+	}
+	if ((sysfs_get_name_from_path(linkpath, ln->name, SYSFS_NAME_LEN)) != 0
+	    || (sysfs_get_link(linkpath, ln->target, SYSFS_PATH_MAX)) != 0) {
+		errno = EINVAL;
+		dprintf(stderr, "Invalid link path %s\n", linkpath);
+		return NULL;
+	}
+
+	return ln;
+}
+
+/**
+ * sysfs_read_directory: grabs attributes, links, and subdirectories
+ * @sysdir: sysfs directory to open
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_directory(struct sysfs_directory *sysdir)
+{
+	DIR *dir = NULL;
+	struct dirent *dirent = NULL;
+	struct stat astats;
+	struct sysfs_attribute *attr = NULL;
+	struct sysfs_directory *subdir = NULL;
+	struct sysfs_link *ln = NULL;
+	char file_path[SYSFS_PATH_MAX];
+	int retval = 0;
+
+	if (sysdir == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	dir = opendir(sysdir->path);
+	if (dir == NULL) {
+		perror("opendir");
+		return -1;
+	}
+	while(((dirent = readdir(dir)) != NULL) && retval == 0) {
+		if (0 == strcmp(dirent->d_name, "."))
+			 continue;
+		if (0 == strcmp(dirent->d_name, ".."))
+			continue;
+		memset(file_path, 0, SYSFS_PATH_MAX);
+		strncpy(file_path, sysdir->path, sizeof(file_path));
+		strncat(file_path, "/", sizeof(file_path));
+		strncat(file_path, dirent->d_name, sizeof(file_path));
+		if ((lstat(file_path, &astats)) != 0) {
+			perror("stat");
+			continue;
+		}
+		if (S_ISREG(astats.st_mode)) {	
+			attr = sysfs_open_attribute(file_path);
+			if (attr == NULL) {
+				dprintf (stderr, "Error opening attribute %s\n",
+					file_path);
+				retval = -1;
+				break;
+			}
+			if (attr->method & SYSFS_METHOD_SHOW) {
+				if ((sysfs_read_attribute(attr)) != 0) {
+					dprintf (stderr, 
+						"Error reading attribute %s\n",
+						file_path);
+					sysfs_close_attribute(attr);
+					continue;
+				}
+			}
+			add_attr_to_dir(sysdir, attr);
+		} else if (S_ISDIR(astats.st_mode)) {
+			subdir = sysfs_open_directory(file_path);
+			if (subdir == NULL) {
+				dprintf (stderr, "Error opening directory %s\n",
+					file_path);
+				retval = -1;
+				break;
+			}
+			add_subdir_to_dir(sysdir, subdir);
+		} else if (S_ISLNK(astats.st_mode)) {
+			ln = sysfs_open_link(file_path);
+			if (ln == NULL) {
+				dprintf(stderr, "Error opening link %s\n",
+					file_path);
+				retval = -1;
+				break;
+			}
+			add_link_to_dir(sysdir, ln);
+		}
+	}
+	closedir(dir);
+	return(retval);
+}
diff --git a/lib/sysfs_driver.c b/lib/sysfs_driver.c
new file mode 100644
index 0000000..6813c85
--- /dev/null
+++ b/lib/sysfs_driver.c
@@ -0,0 +1,89 @@
+/*
+ * sysfs_driver.c
+ *
+ * Driver utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_driver: closes and cleans up driver structure
+ * @driver: driver to close
+ */
+void sysfs_close_driver(struct sysfs_driver *driver)
+{
+	if (driver != NULL) {
+		if (driver->directory != NULL)
+			sysfs_close_directory(driver->directory);
+		free(driver);
+	}
+}
+
+/**
+ * alloc_driver: allocates and initializes driver
+ * returns struct sysfs_driver with success and NULL with error.
+ */
+static struct sysfs_driver *alloc_driver(void)
+{
+	return (struct sysfs_driver *)calloc(1, sizeof(struct sysfs_driver));
+}
+
+/**
+ * sysfs_open_driver: opens and initializes driver structure
+ * @path: path to driver directory
+ * returns struct sysfs_driver with success and NULL with error
+ */
+struct sysfs_driver *sysfs_open_driver(const char *path)
+{
+	struct sysfs_driver *driver = NULL;
+	struct sysfs_directory *sdir = NULL;
+	char devname[SYSFS_NAME_LEN];
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	sdir = sysfs_open_directory(path);
+	if (sdir == NULL) {
+		dprintf (stderr, "Error opening directory %s\n", path);
+		return NULL;
+	}
+	if ((sysfs_read_directory(sdir)) != 0) {
+		dprintf (stderr, "Error reading directory %s\n", path);
+		sysfs_close_directory(sdir);
+		return NULL;
+	}
+	driver = alloc_driver();
+	if (driver == NULL) {
+		dprintf(stderr, "Error allocating driver at %s\n", path);
+		sysfs_close_directory(sdir);
+		return NULL;
+	}
+	if ((sysfs_get_name_from_path(path, devname, SYSFS_NAME_LEN)) != 0) {
+		dprintf (stderr, "Error reading directory %s\n", path);
+		sysfs_close_directory(sdir);
+		free(driver);
+		return NULL;
+	}
+	strncpy(driver->name, devname, sizeof(driver->name));
+	driver->directory = sdir;	
+	
+	return driver;
+}
diff --git a/lib/sysfs_utils.c b/lib/sysfs_utils.c
new file mode 100644
index 0000000..a2410ab
--- /dev/null
+++ b/lib/sysfs_utils.c
@@ -0,0 +1,156 @@
+/*
+ * syfs_utils.c
+ *
+ * System utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_get_mnt_path: Gets the mount point for specified filesystem.
+ * @fs_type: filesystem type to retrieve mount point
+ * @mnt_path: place to put the retrieved mount path
+ * @len: size of mnt_path
+ * returns 0 with success and -1 with error.
+ */
+static int sysfs_get_fs_mnt_path(const char *fs_type, char *mnt_path, 
+				 size_t len)
+{
+	FILE *mnt;
+	struct mntent *mntent;
+	int ret = 0;
+	size_t dirlen = 0;
+
+	/* check arg */
+	if (fs_type == NULL || mnt_path == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if ((mnt = setmntent(SYSFS_PROC_MNTS, "r")) == NULL) {
+		dprintf(stderr, "Error getting mount information\n");
+		return -1;
+	}
+	while (ret == 0 && dirlen == 0 && (mntent = getmntent(mnt)) != NULL) {
+		if (strcmp(mntent->mnt_type, fs_type) == 0) {
+			dirlen = strlen(mntent->mnt_dir);
+			if (dirlen <= (len - 1)) {
+				strcpy(mnt_path, mntent->mnt_dir);
+			} else {
+				dprintf(stderr, 
+					"Error - mount path too long\n");
+				ret = -1;
+			}
+		}
+	}
+	endmntent(mnt);
+	if (dirlen == 0 && ret == 0) {
+		dprintf(stderr, "Filesystem %s not found!\n", fs_type);
+		errno = EINVAL;
+		ret = -1;
+	}
+	return ret;
+}
+
+/*
+ * sysfs_get_mnt_path: Gets the sysfs mount point.
+ * @mnt_path: place to put "sysfs" mount point
+ * @len: size of mnt_path
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_get_mnt_path(char *mnt_path, size_t len)
+{
+	int ret = -1;
+
+	if (mnt_path != NULL)
+		ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
+	else
+		errno = EINVAL;
+
+	return ret;
+}
+
+/**
+ * sysfs_get_name_from_path: returns last name from a "/" delimited path
+ * @path: path to get name from
+ * @name: where to put name
+ * @len: size of name
+ */
+int sysfs_get_name_from_path(const char *path, char *name, size_t len)
+{
+	char *n = NULL;
+                                                                                
+	if (path == NULL || name == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	n = strrchr(path, '/');
+	if (n == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	n++;
+	strncpy(name, n, len);
+
+	return 0;
+}
+
+/**
+ * sysfs_get_link: returns link source
+ * @path: symbolic link's path
+ * @target: where to put name
+ * @len: size of name
+ */
+int sysfs_get_link(const char *path, char *target, size_t len)
+{
+	char devdir[SYSFS_PATH_MAX];
+	char linkpath[SYSFS_PATH_MAX];
+	char *d = NULL;
+
+	if (path == NULL || target == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	memset(devdir, 0, SYSFS_PATH_MAX);
+	memset(linkpath, 0, SYSFS_PATH_MAX);
+
+	if ((sysfs_get_mnt_path(devdir, SYSFS_PATH_MAX)) != 0) {
+		dprintf(stderr, "Sysfs not supported on this system\n");
+		return -1;
+	}
+								        
+	if ((readlink(path, linkpath, SYSFS_PATH_MAX)) < 0) {
+		return -1;
+	}
+									        
+	d = linkpath;
+
+	/* getting rid of leading "../.." */	
+	while (*d == '/' || *d == '.')
+		d++;
+
+	d--;
+	
+	strcat(devdir, d);
+	strncpy(target, devdir, len);
+
+	return 0;
+}