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Diffstat (limited to 'agents/linux26/sysfs/libsysfs/sysfs_device.c')
-rw-r--r--agents/linux26/sysfs/libsysfs/sysfs_device.c537
1 files changed, 537 insertions, 0 deletions
diff --git a/agents/linux26/sysfs/libsysfs/sysfs_device.c b/agents/linux26/sysfs/libsysfs/sysfs_device.c
new file mode 100644
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+++ b/agents/linux26/sysfs/libsysfs/sysfs_device.c
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+/*
+ * sysfs_device.c
+ *
+ * Generic device utility functions for libsysfs
+ *
+ * Copyright (C) IBM Corp. 2003
+ *
+ * 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"
+
+static int confirm_device_bus(struct sysfs_device *dev,
+ unsigned char *busname, unsigned char *bus_id)
+{
+ struct sysfs_link *devlink = NULL;
+ unsigned char devpath[SYSFS_PATH_MAX];
+ int result = 0;
+
+ if (busname == NULL || bus_id == NULL)
+ return -1;
+
+ if (sysfs_get_mnt_path(devpath, SYSFS_PATH_MAX) != 0)
+ return -1;
+
+ strcat(devpath, SYSFS_BUS_DIR);
+ strcat(devpath, "/");
+ strcat(devpath, busname);
+ strcat(devpath, SYSFS_DEVICES_DIR);
+ strcat(devpath, "/");
+ strcat(devpath, bus_id);
+
+ devlink = sysfs_open_link(devpath);
+ if (devlink == NULL)
+ return -1;
+
+ if (strcmp(devlink->target, dev->path) == 0)
+ result++;
+ sysfs_close_link(devlink);
+ return result;
+}
+
+/**
+ * get_device_bus: retrieves the bus name the device is on, checks path to
+ * bus' link to make sure it has correct device.
+ * @dev: device to get busname.
+ * returns 0 with success and -1 with error.
+ */
+static int get_device_bus(struct sysfs_device *dev)
+{
+ unsigned char subsys[SYSFS_NAME_LEN], *bus = NULL, *curdev = NULL;
+ struct dlist *buslist = NULL, *device_list = NULL;
+
+ if (dev == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ strcpy(subsys, SYSFS_BUS_DIR); /* subsys = /bus */
+ buslist = sysfs_open_subsystem_list(subsys);
+ if (buslist != NULL) {
+ dlist_for_each_data(buslist, bus, char) {
+ device_list = sysfs_open_bus_devices_list(bus);
+ if (device_list != NULL) {
+ dlist_for_each_data(device_list,
+ curdev, char) {
+ if (strcmp(dev->bus_id, curdev) == 0
+ && confirm_device_bus(dev, bus,
+ curdev) > 0) {
+ strcpy(dev->bus, bus);
+ sysfs_close_list(device_list);
+ sysfs_close_list(buslist);
+ return 0;
+ }
+ }
+ sysfs_close_list(device_list);
+ }
+ }
+ sysfs_close_list(buslist);
+ }
+ return -1;
+}
+
+/**
+ * sysfs_close_device_tree: closes every device in the supplied tree,
+ * closing children only.
+ * @devroot: device root of tree.
+ */
+static void sysfs_close_device_tree(struct sysfs_device *devroot)
+{
+ if (devroot != NULL) {
+ if (devroot->children != NULL) {
+ struct sysfs_device *child = NULL;
+
+ dlist_for_each_data(devroot->children, child,
+ struct sysfs_device) {
+ sysfs_close_device_tree(child);
+ }
+ }
+ sysfs_close_device(devroot);
+ }
+}
+
+/**
+ * sysfs_del_device: routine for dlist integration
+ */
+static void sysfs_del_device(void *dev)
+{
+ sysfs_close_device((struct sysfs_device *)dev);
+}
+
+/**
+ * sysfs_close_dev_tree: routine for dlist integration
+ */
+static void sysfs_close_dev_tree(void *dev)
+{
+ sysfs_close_device_tree((struct sysfs_device *)dev);
+}
+
+/**
+ * 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) {
+ if (dev->directory != NULL)
+ sysfs_close_directory(dev->directory);
+ if (dev->children != NULL && dev->children->count == 0)
+ dlist_destroy(dev->children);
+ 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 unsigned char *name)
+{
+ struct sysfs_attribute *cur = NULL;
+
+ if (dev == NULL || dev->directory == NULL
+ || dev->directory->attributes == NULL || name == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ cur = sysfs_get_directory_attribute(dev->directory,
+ (unsigned char *)name);
+ if (cur != NULL)
+ 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 unsigned char *path)
+{
+ struct sysfs_device *dev = NULL;
+ struct sysfs_directory *sdir = NULL;
+
+ if (path == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+ dev = alloc_device();
+ if (dev == NULL) {
+ dprintf("Error allocating device at %s\n", path);
+ return NULL;
+ }
+ sdir = sysfs_open_directory(path);
+ if (sdir == NULL) {
+ dprintf("Invalid device at %s\n", path);
+ errno = EINVAL;
+ sysfs_close_device(dev);
+ return NULL;
+ }
+ if ((sysfs_read_directory(sdir)) != 0) {
+ dprintf("Error reading device directory at %s\n", path);
+ sysfs_close_directory(sdir);
+ sysfs_close_device(dev);
+ return NULL;
+ }
+ dev->directory = sdir;
+ strcpy(dev->bus_id, sdir->name);
+ strcpy(dev->path, sdir->path);
+
+ /*
+ * The "name" attribute no longer exists... return the device's
+ * sysfs representation instead, in the "dev->name" field, which
+ * implies that the dev->name and dev->bus_id contain same data.
+ */
+ strncpy(dev->name, sdir->name, SYSFS_NAME_LEN);
+
+ if (get_device_bus(dev) != 0)
+ strcpy(dev->bus, SYSFS_UNKNOWN);
+
+ return dev;
+}
+
+/**
+ * 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.
+ */
+static struct sysfs_device *sysfs_open_device_tree(const unsigned 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("Error opening root device at %s\n", path);
+ return NULL;
+ }
+ if (rootdev->directory->subdirs != NULL) {
+ dlist_for_each_data(rootdev->directory->subdirs, cur,
+ struct sysfs_directory) {
+ new = sysfs_open_device_tree(cur->path);
+ if (new == NULL) {
+ dprintf("Error opening device tree at %s\n",
+ cur->path);
+ sysfs_close_device_tree(rootdev);
+ return NULL;
+ }
+ if (rootdev->children == NULL)
+ rootdev->children = dlist_new_with_delete
+ (sizeof(struct sysfs_device),
+ sysfs_del_device);
+ dlist_unshift(rootdev->children, new);
+ }
+ }
+
+ return rootdev;
+}
+
+/**
+ * sysfs_close_root_device: closes root and all devices
+ * @root: root device to close
+ */
+void sysfs_close_root_device(struct sysfs_root_device *root)
+{
+ if (root != NULL) {
+ if (root->devices != NULL)
+ dlist_destroy(root->devices);
+ if (root->directory != NULL)
+ sysfs_close_directory(root->directory);
+ free(root);
+ }
+}
+
+/**
+ * open_root_device_dir: opens up sysfs_directory for specific root dev
+ * @name: name of root
+ * returns struct sysfs_directory with success and NULL with error
+ */
+static struct sysfs_directory *open_root_device_dir(const unsigned char *name)
+{
+ struct sysfs_directory *rdir = NULL;
+ unsigned char rootpath[SYSFS_PATH_MAX];
+
+ if (name == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ memset(rootpath, 0, SYSFS_PATH_MAX);
+ if (sysfs_get_mnt_path(rootpath, SYSFS_PATH_MAX) != 0) {
+ dprintf ("Sysfs not supported on this system\n");
+ return NULL;
+ }
+
+ strcat(rootpath, SYSFS_DEVICES_DIR);
+ strcat(rootpath, "/");
+ strcat(rootpath, name);
+ rdir = sysfs_open_directory(rootpath);
+ if (rdir == NULL) {
+ errno = EINVAL;
+ dprintf ("Root device %s not supported on this system\n",
+ name);
+ return NULL;
+ }
+ if (sysfs_read_directory(rdir) != 0) {
+ dprintf ("Error reading %s root device at dir %s\n", name,
+ rootpath);
+ sysfs_close_directory(rdir);
+ return NULL;
+ }
+
+ return rdir;
+}
+
+/**
+ * get_all_root_devices: opens up all the devices under this root device
+ * @root: root device to open devices for
+ * returns 0 with success and -1 with error
+ */
+static int get_all_root_devices(struct sysfs_root_device *root)
+{
+ struct sysfs_device *dev = NULL;
+ struct sysfs_directory *cur = NULL;
+
+ if (root == NULL || root->directory == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (root->directory->subdirs == NULL)
+ return 0;
+
+ dlist_for_each_data(root->directory->subdirs, cur,
+ struct sysfs_directory) {
+ dev = sysfs_open_device_tree(cur->path);
+ if (dev == NULL) {
+ dprintf ("Error opening device at %s\n", cur->path);
+ continue;
+ }
+ if (root->devices == NULL)
+ root->devices = dlist_new_with_delete
+ (sizeof(struct sysfs_device),
+ sysfs_close_dev_tree);
+ dlist_unshift(root->devices, dev);
+ }
+
+ return 0;
+}
+
+/**
+ * sysfs_open_root_device: opens sysfs devices root and all of its
+ * devices.
+ * @name: name of /sys/devices/root to open
+ * returns struct sysfs_root_device if success and NULL with error
+ */
+struct sysfs_root_device *sysfs_open_root_device(const unsigned char *name)
+{
+ struct sysfs_root_device *root = NULL;
+ struct sysfs_directory *rootdir = NULL;
+
+ if (name == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ root = (struct sysfs_root_device *)calloc
+ (1, sizeof(struct sysfs_root_device));
+ if (root == NULL) {
+ dprintf("calloc failure\n");
+ return NULL;
+ }
+ rootdir = open_root_device_dir(name);
+ if (rootdir == NULL) {
+ dprintf ("Invalid root device, %s not supported\n", name);
+ sysfs_close_root_device(root);
+ return NULL;
+ }
+ strcpy(root->path, rootdir->path);
+ root->directory = rootdir;
+ if (get_all_root_devices(root) != 0) {
+ dprintf ("Error retrieving devices for root %s\n", name);
+ sysfs_close_root_device(root);
+ return NULL;
+ }
+
+ return root;
+}
+
+/**
+ * sysfs_get_device_attributes: returns a dlist of attributes corresponding to
+ * the specific device
+ * @device: struct sysfs_device * for which attributes are to be returned
+ */
+struct dlist *sysfs_get_device_attributes(struct sysfs_device *device)
+{
+ if (device == NULL || device->directory == NULL)
+ return NULL;
+
+ return (device->directory->attributes);
+}
+
+/**
+ * get_device_absolute_path: looks up the bus the device is on, gets
+ * absolute path to the device
+ * @device: device for which path is needed
+ * @path: buffer to store absolute path
+ * @psize: size of "path"
+ * Returns 0 on success -1 on failure
+ */
+static int get_device_absolute_path(const unsigned char *device,
+ const unsigned char *bus, unsigned char *path, size_t psize)
+{
+ unsigned char bus_path[SYSFS_NAME_LEN];
+
+ if (device == NULL || path == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ memset(bus_path, 0, SYSFS_NAME_LEN);
+ if (sysfs_get_mnt_path(bus_path, SYSFS_PATH_MAX) != 0) {
+ dprintf ("Sysfs not supported on this system\n");
+ return -1;
+ }
+ strcat(bus_path, SYSFS_BUS_DIR);
+ strcat(bus_path, "/");
+ strcat(bus_path, bus);
+ strcat(bus_path, SYSFS_DEVICES_DIR);
+ strcat(bus_path, "/");
+ strcat(bus_path, device);
+ /*
+ * We now are at /sys/bus/"bus_name"/devices/"device" which is a link.
+ * Now read this link to reach to the device.
+ */
+ if ((sysfs_get_link(bus_path, path, SYSFS_PATH_MAX)) != 0) {
+ dprintf("Error getting to device %s\n", device);
+ return -1;
+ }
+ return 0;
+}
+
+/**
+ * sysfs_open_device_by_id: open a device by id (use the "bus" subsystem)
+ * @bus_id: bus_id of the device to open - has to be the "bus_id" in
+ * /sys/bus/xxx/devices
+ * @bus: bus the device belongs to
+ * @bsize: size of the bus buffer
+ * returns struct sysfs_device if found, NULL otherwise
+ * NOTE:
+ * 1. Use sysfs_close_device to close the device
+ * 2. Bus the device is on must be supplied
+ * Use sysfs_find_device_bus to get the bus name
+ */
+struct sysfs_device *sysfs_open_device_by_id(const unsigned char *bus_id,
+ const unsigned char *bus, size_t bsize)
+{
+ char sysfs_path[SYSFS_PATH_MAX];
+ struct sysfs_device *device = NULL;
+
+ if (bus_id == NULL || bus == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+ memset(sysfs_path, 0, SYSFS_PATH_MAX);
+ if ((get_device_absolute_path(bus_id, bus, sysfs_path,
+ SYSFS_PATH_MAX)) != 0) {
+ dprintf("Error getting to device %s\n", bus_id);
+ return NULL;
+ }
+
+ device = sysfs_open_device(sysfs_path);
+ if (device == NULL) {
+ dprintf("Error opening device %s\n", bus_id);
+ return NULL;
+ }
+
+ return device;
+}
+
+/*
+ * sysfs_open_device_attr: open the given device's attribute
+ * @bus: Bus on which to look
+ * @dev_id: device for which attribute is required
+ * @attrname: name of the attribute to look for
+ * Returns struct sysfs_attribute on success and NULL on failure
+ *
+ * NOTE:
+ * A call to sysfs_close_attribute() is required to close
+ * the attribute returned and free memory.
+ */
+struct sysfs_attribute *sysfs_open_device_attr(const unsigned char *bus,
+ const unsigned char *bus_id, const unsigned char *attrib)
+{
+ struct sysfs_attribute *attribute = NULL;
+ unsigned char devpath[SYSFS_PATH_MAX];
+
+ if (bus == NULL || bus_id == NULL || attrib == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ memset(devpath, 0, SYSFS_PATH_MAX);
+ if ((get_device_absolute_path(bus_id, bus, devpath,
+ SYSFS_PATH_MAX)) != 0) {
+ dprintf("Error getting to device %s\n", bus_id);
+ return NULL;
+ }
+ strcat(devpath, "/");
+ strcat(devpath, attrib);
+ attribute = sysfs_open_attribute(devpath);
+ if (attribute == NULL) {
+ dprintf("Error opening attribute %s for device %s\n",
+ attrib, bus_id);
+ return NULL;
+ }
+ if ((sysfs_read_attribute(attribute)) != 0) {
+ dprintf("Error reading attribute %s for device %s\n",
+ attrib, bus_id);
+ sysfs_close_attribute(attribute);
+ return NULL;
+ }
+ return attribute;
+}
+
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