*
* Driver utility functions for libsysfs
*
- * Copyright (C) 2003 International Business Machines, Inc.
+ * Copyright (C) IBM Corp. 2003-2005
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include "libsysfs.h"
#include "sysfs.h"
+static void sysfs_close_driver_device(void *device)
+{
+ sysfs_close_device((struct sysfs_device *)device);
+}
+
/**
- * sysfs_close_driver: closes and cleans up driver structure
+ * sysfs_close_driver: closes driver and deletes device lists too
* @driver: driver to close
*/
void sysfs_close_driver(struct sysfs_driver *driver)
{
- if (driver != NULL) {
- if (driver->directory != NULL)
- sysfs_close_directory(driver->directory);
+ if (driver) {
+ if (driver->devices)
+ dlist_destroy(driver->devices);
+ if (driver->attrlist)
+ dlist_destroy(driver->attrlist);
free(driver);
}
}
}
/**
- * sysfs_open_driver: opens and initializes driver structure
+ * get_driver_bus: gets bus the driver is on
+ * Returns 0 on success and 1 on error
+ */
+static int get_driver_bus(struct sysfs_driver *drv)
+{
+ char drvpath[SYSFS_PATH_MAX], *c = NULL;
+
+ if (!drv) {
+ errno = EINVAL;
+ return 1;
+ }
+
+ safestrcpy(drvpath, drv->path);
+ c = strstr(drvpath, SYSFS_DRIVERS_NAME);
+ if (c == NULL)
+ return 1;
+ *--c = '\0';
+ c = strstr(drvpath, SYSFS_BUS_NAME);
+ if (c == NULL)
+ return 1;
+ c = strstr(c, "/");
+ if (c == NULL)
+ return 1;
+ c++;
+ safestrcpy(drv->bus, c);
+ return 0;
+}
+
+/**
+ * sysfs_get_driver_attr: searches drv's attributes by name
+ * @drv: driver to look through
+ * @name: attribute name to get
+ * returns sysfs_attribute reference with success or NULL with error.
+ */
+struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
+ const char *name)
+{
+ if (!drv || !name) {
+ errno = EINVAL;
+ return NULL;
+ }
+ return get_attribute(drv, (char *)name);
+}
+
+/**
+ * sysfs_get_driver_attributes: gets list of driver attributes
+ * @dev: driver whose attributes list is needed
+ * returns dlist of attributes on success or NULL on error
+ */
+struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *drv)
+{
+ if (!drv) {
+ errno = EINVAL;
+ return NULL;
+ }
+ return get_attributes_list(drv);
+}
+
+/**
+ * sysfs_open_driver_path: 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 *sysfs_open_driver_path(const char *path)
{
struct sysfs_driver *driver = NULL;
- struct sysfs_directory *sdir = NULL;
- char devname[SYSFS_NAME_LEN];
- if (path == NULL) {
+ if (!path) {
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);
+ if (sysfs_path_is_dir(path)) {
+ dprintf("Invalid path to driver: %s\n", path);
return NULL;
}
driver = alloc_driver();
- if (driver == NULL) {
- dprintf(stderr, "Error allocating driver at %s\n", path);
- sysfs_close_directory(sdir);
+ if (!driver) {
+ dprintf("Error allocating driver at %s\n", path);
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);
+ if (sysfs_get_name_from_path(path, driver->name, SYSFS_NAME_LEN)) {
+ dprintf("Error getting driver name from path\n");
free(driver);
return NULL;
}
- strncpy(driver->name, devname, sizeof(driver->name));
- driver->directory = sdir;
-
+ safestrcpy(driver->path, path);
+ if (sysfs_remove_trailing_slash(driver->path)) {
+ dprintf("Invalid path to driver %s\n", driver->path);
+ sysfs_close_driver(driver);
+ return NULL;
+ }
+ if (get_driver_bus(driver)) {
+ dprintf("Could not get the bus driver is on\n");
+ sysfs_close_driver(driver);
+ return NULL;
+ }
+
return driver;
}
+
+/**
+ * get_driver_path: looks up the bus the driver is on and builds path to
+ * the driver.
+ * @bus: bus on which to search
+ * @drv: driver to look for
+ * @path: buffer to return path to driver
+ * @psize: size of "path"
+ * Returns 0 on success and -1 on error
+ */
+static int get_driver_path(const char *bus, const char *drv,
+ char *path, size_t psize)
+{
+ if (!bus || !drv || !path || psize == 0) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (sysfs_get_mnt_path(path, psize)) {
+ dprintf("Error getting sysfs mount path\n");
+ return -1;
+ }
+ safestrcatmax(path, "/", psize);
+ safestrcatmax(path, SYSFS_BUS_NAME, psize);
+ safestrcatmax(path, "/", psize);
+ safestrcatmax(path, bus, psize);
+ safestrcatmax(path, "/", psize);
+ safestrcatmax(path, SYSFS_DRIVERS_NAME, psize);
+ safestrcatmax(path, "/", psize);
+ safestrcatmax(path, drv, psize);
+ return 0;
+}
+
+/**
+ * sysfs_open_driver: open driver by name, given its bus
+ * @bus_name: Name of the bus
+ * @drv_name: Name of the driver
+ * Returns the sysfs_driver reference on success and NULL on failure
+ */
+struct sysfs_driver *sysfs_open_driver(const char *bus_name,
+ const char *drv_name)
+{
+ char path[SYSFS_PATH_MAX];
+ struct sysfs_driver *driver = NULL;
+
+ if (!drv_name || !bus_name) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ memset(path, 0, SYSFS_PATH_MAX);
+ if (get_driver_path(bus_name, drv_name, path, SYSFS_PATH_MAX)) {
+ dprintf("Error getting to driver %s\n", drv_name);
+ return NULL;
+ }
+ driver = sysfs_open_driver_path(path);
+ if (!driver) {
+ dprintf("Error opening driver at %s\n", path);
+ return NULL;
+ }
+ return driver;
+}
+
+/**
+ * sysfs_get_driver_devices: gets list of devices that use the driver
+ * @drv: sysfs_driver whose device list is needed
+ * Returns dlist of struct sysfs_device on success and NULL on failure
+ */
+struct dlist *sysfs_get_driver_devices(struct sysfs_driver *drv)
+{
+ char *ln = NULL;
+ struct dlist *linklist = NULL;
+ struct sysfs_device *dev = NULL;
+
+ if (!drv) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ linklist = read_dir_links(drv->path);
+ if (linklist) {
+ dlist_for_each_data(linklist, ln, char) {
+
+ if (!strncmp(ln, SYSFS_MODULE_NAME, strlen(ln)))
+ continue;
+
+ dev = sysfs_open_device(drv->bus, ln);
+ if (!dev) {
+ dprintf("Error opening driver's device\n");
+ sysfs_close_list(linklist);
+ return NULL;
+ }
+ if (!drv->devices) {
+ drv->devices = dlist_new_with_delete
+ (sizeof(struct sysfs_device),
+ sysfs_close_driver_device);
+ if (!drv->devices) {
+ dprintf("Error creating device list\n");
+ sysfs_close_list(linklist);
+ return NULL;
+ }
+ }
+ dlist_unshift_sorted(drv->devices, dev, sort_list);
+ }
+ sysfs_close_list(linklist);
+ }
+ return drv->devices;
+}
~ianmdlvl / elogind.git / blobdiff