*
* Driver utility functions for libsysfs
*
- * Copyright (C) IBM Corp. 2003
+ * 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_by_name_dev(void *device)
+static void sysfs_close_driver_device(void *device)
{
sysfs_close_device((struct sysfs_device *)device);
}
/**
- * sysfs_close_driver: closes and cleans up driver structure
- * NOTE: This routine does not deallocate devices list
+ * 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->devices != NULL) {
- dlist_for_each(driver->devices)
- dlist_shift(driver->devices);
- free(driver->devices);
- driver->devices = NULL;
- }
- if (driver->directory != NULL)
- sysfs_close_directory(driver->directory);
- free(driver);
- }
-}
-
-/**
- * sysfs_close_driver_by_name: closes driver and deletes device lists too
- * @driver: driver to close
- */
-void sysfs_close_driver_by_name(struct sysfs_driver *driver)
-{
- if (driver != NULL) {
- if (driver->devices != NULL)
+ if (driver) {
+ if (driver->devices)
dlist_destroy(driver->devices);
- if (driver->directory != NULL)
- sysfs_close_directory(driver->directory);
+ if (driver->attrlist)
+ dlist_destroy(driver->attrlist);
free(driver);
}
}
-
+
/**
* alloc_driver: allocates and initializes driver
* returns struct sysfs_driver with success and NULL with error.
}
/**
- * sysfs_open_driver: opens and initializes driver structure
- * @path: path to driver directory
- * returns struct sysfs_driver with success and NULL with error
+ * get_driver_bus: gets bus the driver is on
+ * Returns 0 on success and 1 on error
*/
-struct sysfs_driver *sysfs_open_driver(const unsigned char *path)
+static int get_driver_bus(struct sysfs_driver *drv)
{
- struct sysfs_driver *driver = NULL;
- struct sysfs_directory *sdir = NULL;
-
- if (path == NULL) {
+ char drvpath[SYSFS_PATH_MAX], *c = NULL;
+
+ if (!drv) {
errno = EINVAL;
- return NULL;
- }
- sdir = sysfs_open_directory(path);
- if (sdir == NULL) {
- dprintf("Error opening directory %s\n", path);
- return NULL;
- }
- if ((sysfs_read_directory(sdir)) != 0) {
- dprintf("Error reading directory %s\n", path);
- sysfs_close_directory(sdir);
- return NULL;
- }
- driver = alloc_driver();
- if (driver == NULL) {
- dprintf("Error allocating driver at %s\n", path);
- sysfs_close_directory(sdir);
- return NULL;
+ return 1;
}
- strcpy(driver->name, sdir->name);
- driver->directory = sdir;
- strcpy(driver->path, sdir->path);
-
- return driver;
+
+ 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_attributes: gets list of attributes for the given driver
- * @driver: sysfs_driver for which attributes are required
- * returns a dlist of attributes corresponding to the driver if present
- * NULL otherwise
+ * 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 dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
+struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
+ const char *name)
{
- if (driver == NULL || driver->directory == NULL)
+ if (!drv || !name) {
+ errno = EINVAL;
return NULL;
-
- return(driver->directory->attributes);
+ }
+ return get_attribute(drv, (char *)name);
}
/**
- * sysfs_get_driver_attr: searches driver's attributes by name
- * @drv: driver to look through
- * @name: attribute name to get
- * returns sysfs_attribute reference on success or NULL with error
- */
-struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
- const unsigned 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)
{
- struct sysfs_attribute *cur = NULL;
-
- if (drv == NULL || drv->directory == NULL
- || drv->directory->attributes == NULL || name == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- cur = sysfs_get_directory_attribute(drv->directory,
- (unsigned char *)name);
- if (cur != NULL)
- return cur;
-
- return NULL;
+ if (!drv) {
+ errno = EINVAL;
+ return NULL;
+ }
+ return get_attributes_list(drv);
}
/**
- * sysfs_get_driver_links: gets list of links from the given driver
- * @driver: sysfs_driver for which links list is required
- * returns a dlist of links corresponding to the driver if present
- * NULL otherwise
+ * 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 dlist *sysfs_get_driver_links(struct sysfs_driver *driver)
+struct sysfs_driver *sysfs_open_driver_path(const char *path)
{
- if (driver == NULL || driver->directory == NULL)
+ struct sysfs_driver *driver = NULL;
+
+ if (!path) {
+ errno = EINVAL;
+ return NULL;
+ }
+ if (sysfs_path_is_dir(path)) {
+ dprintf("Invalid path to driver: %s\n", path);
+ return NULL;
+ }
+ driver = alloc_driver();
+ if (!driver) {
+ dprintf("Error allocating driver at %s\n", path);
+ return NULL;
+ }
+ if (sysfs_get_name_from_path(path, driver->name, SYSFS_NAME_LEN)) {
+ dprintf("Error getting driver name from path\n");
+ free(driver);
+ return NULL;
+ }
+ 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->directory->links);
+ return driver;
}
/**
* @psize: size of "path"
* Returns 0 on success and -1 on error
*/
-static int get_driver_path(const unsigned char *bus, const unsigned char *drv,
- unsigned char *path, size_t psize)
+static int get_driver_path(const char *bus, const char *drv,
+ char *path, size_t psize)
{
- if (bus == NULL || drv == NULL || path == NULL) {
+ if (!bus || !drv || !path || psize == 0) {
errno = EINVAL;
return -1;
}
- if (sysfs_get_mnt_path(path, psize) != 0) {
+ if (sysfs_get_mnt_path(path, psize)) {
dprintf("Error getting sysfs mount path\n");
return -1;
}
- strcat(path, SYSFS_BUS_DIR);
- strcat(path, "/");
- strcat(path, bus);
- strcat(path, SYSFS_DRIVERS_DIR);
- strcat(path, "/");
- strcat(path, drv);
+ 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_by_name: open a driver by name and return the bus
- * the driver is on.
- * @drv_name: driver to open
- * @bus: the driver bus
- * @bsize: size of bus buffer
- * returns struct sysfs_driver if found, NULL otherwise
- * NOTE:
- * 1. Need to call sysfs_close_driver_by_name to free up memory
- * 2. Bus the driver is registered with must be supplied.
- * Use sysfs_find_driver_bus() to obtain the bus name
+ * 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_by_name(const unsigned char *drv_name,
- const unsigned char *bus, size_t bsize)
+struct sysfs_driver *sysfs_open_driver(const char *bus_name,
+ const char *drv_name)
{
+ char path[SYSFS_PATH_MAX];
struct sysfs_driver *driver = NULL;
- struct sysfs_device *device = NULL;
- struct sysfs_link *curlink = NULL;
- unsigned char path[SYSFS_PATH_MAX];
- if (drv_name == NULL || bus == NULL) {
+ if (!drv_name || !bus_name) {
errno = EINVAL;
return NULL;
}
memset(path, 0, SYSFS_PATH_MAX);
- if (get_driver_path(bus, drv_name, path, SYSFS_PATH_MAX) != 0) {
+ 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);
- if (driver == NULL) {
- dprintf("Could not open driver %s\n", drv_name);
+ driver = sysfs_open_driver_path(path);
+ if (!driver) {
+ dprintf("Error opening driver at %s\n", path);
return NULL;
}
- if (driver->directory->links != NULL) {
- dlist_for_each_data(driver->directory->links, curlink,
- struct sysfs_link) {
- device = sysfs_open_device(curlink->target);
- if (device == NULL) {
- dprintf("Error opening device at %s\n",
- curlink->target);
- sysfs_close_driver_by_name(driver);
- return NULL;
- }
- strcpy(device->driver_name, drv_name);
- if (driver->devices == NULL)
- driver->devices = dlist_new_with_delete
- (sizeof(struct sysfs_device),
- sysfs_close_driver_by_name_dev);
- dlist_unshift(driver->devices, device);
- }
- }
return driver;
}
-
/**
- * sysfs_open_driver_attr: read the user supplied driver attribute
- * @bus: bus on which to look
- * @drv: driver whose attribute has to be read
- * @attrib: Attribute to be read
- * 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 to free memory
- */
-struct sysfs_attribute *sysfs_open_driver_attr(const unsigned char *bus,
- const unsigned char *drv, const unsigned char *attrib)
+ * 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)
{
- struct sysfs_attribute *attribute = NULL;
- unsigned char path[SYSFS_PATH_MAX];
+ char *ln = NULL;
+ struct dlist *linklist = NULL;
+ struct sysfs_device *dev = NULL;
- if (bus == NULL || drv == NULL || attrib == NULL) {
+ if (!drv) {
errno = EINVAL;
return NULL;
}
- memset(path, 0, SYSFS_NAME_LEN);
- if ((get_driver_path(bus, drv, path, SYSFS_PATH_MAX)) != 0) {
- dprintf("Error getting to driver %s\n", drv);
- return NULL;
- }
- strcat(path, "/");
- strcat(path, attrib);
- attribute = sysfs_open_attribute(path);
- if (attribute == NULL) {
- dprintf("Error opening attribute %s for driver %s\n",
- attrib, drv);
- return NULL;
- }
- if ((sysfs_read_attribute(attribute)) != 0) {
- dprintf("Error reading attribute %s for driver %s\n",
- attrib, drv);
- sysfs_close_attribute(attribute);
- 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 attribute;
+ return drv->devices;
}
-
~ianmdlvl / elogind.git / blobdiff