1 files changed, 270 insertions, 0 deletions
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;
+}