*
* 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
sysfs_close_device((struct sysfs_device *)device);
}
-/**
+/**
* 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)
+ 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);
}
}
-
-/**
- * open_driver_dir: Open the sysfs_directory for this driver
- * @driver: Driver whose directory to be opened
- * Returns 0 on success and 1 on failure
- */
-static int open_driver_dir(struct sysfs_driver *driver)
-{
- if (driver == NULL) {
- errno = EINVAL;
- return 1;
- }
- if (driver->directory == NULL) {
- driver->directory = sysfs_open_directory(driver->path);
- if (driver->directory == NULL) {
- dprintf("Error opening driver directory at %s\n",
- driver->path);
- return 1;
- }
- }
- return 0;
-}
/**
* alloc_driver: allocates and initializes driver
}
/**
- * sysfs_open_driver_path: 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_path(const char *path)
+static int get_driver_bus(struct sysfs_driver *drv)
{
- struct sysfs_driver *driver = NULL;
-
- if (path == NULL) {
- errno = EINVAL;
- return NULL;
- }
- if ((sysfs_path_is_dir(path)) != 0) {
- dprintf("Invalid path to driver: %s\n", path);
- return NULL;
- }
- driver = alloc_driver();
- if (driver == NULL) {
- dprintf("Error allocating driver at %s\n", path);
- return NULL;
- }
- if ((sysfs_get_name_from_path(path, driver->name,
- SYSFS_NAME_LEN)) != 0) {
- dprintf("Error getting driver name from path\n");
- free(driver);
- return NULL;
- }
- safestrcpy(driver->path, path);
- if ((sysfs_remove_trailing_slash(driver->path)) != 0) {
- dprintf("Invalid path to driver %s\n", driver->path);
- sysfs_close_driver(driver);
- return NULL;
- }
+ char drvpath[SYSFS_PATH_MAX], *c = NULL;
- return driver;
-}
-
-/**
- * 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
- */
-struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
-{
- if (driver == NULL) {
+ if (!drv) {
errno = EINVAL;
- return NULL;
- }
-
- if (driver->directory == NULL) {
- if ((open_driver_dir(driver)) == 1)
- return NULL;
- }
- if (driver->directory->attributes == NULL) {
- if ((sysfs_read_dir_attributes(driver->directory)) != 0)
- return NULL;
+ return 1;
}
- return(driver->directory->attributes);
-}
-/**
- * sysfs_refresh_driver_attributes: refreshes the driver's list of attributes
- * @driver: sysfs_driver whose attributes to refresh
- *
- * NOTE: Upon return, prior references to sysfs_attributes for this driver
- * _may_ not be valid
- *
- * Returns list of attributes on success and NULL on failure
- */
-struct dlist *sysfs_refresh_driver_attributes(struct sysfs_driver *driver)
-{
- if (driver == NULL) {
- errno = EINVAL;
- return NULL;
- }
- if (driver->directory == NULL)
- return (sysfs_get_driver_attributes(driver));
-
- if ((sysfs_refresh_dir_attributes(driver->directory)) != 0) {
- dprintf("Error refreshing driver attributes\n");
- return NULL;
- }
- return (driver->directory->attributes);
+ 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 driver's attributes by name
+ * sysfs_get_driver_attr: searches drv's attributes by name
* @drv: driver to look through
* @name: attribute name to get
- * returns sysfs_attribute reference on success or NULL with error
- */
+ * returns sysfs_attribute reference with success or NULL with error.
+ */
struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
- const char *name)
+ const char *name)
{
- struct dlist *attrlist = NULL;
-
- if (drv == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- attrlist = sysfs_get_driver_attributes(drv);
- if (attrlist == NULL)
+ if (!drv || !name) {
+ errno = EINVAL;
return NULL;
-
- return sysfs_get_directory_attribute(drv->directory, (char *)name);
+ }
+ return get_attribute(drv, (char *)name);
}
/**
- * 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_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_links(struct sysfs_driver *driver)
+struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *drv)
{
- if (driver == NULL) {
+ if (!drv) {
errno = EINVAL;
return NULL;
}
-
- if (driver->directory == NULL)
- if ((open_driver_dir(driver)) == 1)
- return NULL;
-
- if (driver->directory->links == NULL)
- if ((sysfs_read_dir_links(driver->directory)) != 0)
- return NULL;
-
- return(driver->directory->links);
+ return get_attributes_list(drv);
}
/**
- * sysfs_get_driver_devices: open up the list of devices this driver supports
- * @driver: sysfs_driver for which devices are needed
- * Returns dlist of devices on SUCCESS or NULL with ERROR
- */
-struct dlist *sysfs_get_driver_devices(struct sysfs_driver *driver)
+ * 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_path(const char *path)
{
- struct sysfs_link *curlink = NULL;
- struct sysfs_device *device = NULL;
+ struct sysfs_driver *driver = NULL;
- if (driver == NULL) {
+ if (!path) {
errno = EINVAL;
return NULL;
}
-
- if (driver->devices != NULL)
- return (driver->devices);
-
- if (driver->directory == NULL || driver->directory->links == NULL) {
- struct dlist *list = NULL;
- list = sysfs_get_driver_links(driver);
- }
-
- if (driver->directory->links != NULL) {
- dlist_for_each_data(driver->directory->links, curlink,
- struct sysfs_link) {
- device = sysfs_open_device_path(curlink->target);
- if (device == NULL) {
- dprintf("Error opening device at %s\n",
- curlink->target);
- return NULL;
- }
- if (driver->devices == NULL)
- driver->devices = dlist_new_with_delete
- (sizeof(struct sysfs_device),
- sysfs_close_driver_device);
- dlist_unshift_sorted(driver->devices, device,
- sort_list);
- }
+ if (sysfs_path_is_dir(path)) {
+ dprintf("Invalid path to driver: %s\n", path);
+ return NULL;
}
- return (driver->devices);
-}
-
-/**
- * sysfs_refresh_driver_devices: Refreshes drivers list of devices
- * @driver: sysfs_driver whose devices list needs to be refreshed
- *
- * NOTE: Upon return from this function, prior sysfs_device references from
- * this driver's list of devices _may_ not be valid
- *
- * Returns dlist of devices on success and NULL on failure
- */
-struct dlist *sysfs_refresh_driver_devices(struct sysfs_driver *driver)
-{
- if (driver == NULL) {
- errno = EINVAL;
+ driver = alloc_driver();
+ if (!driver) {
+ dprintf("Error allocating driver at %s\n", path);
return NULL;
}
-
- if (driver->devices != NULL) {
- dlist_destroy(driver->devices);
- driver->devices = 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;
}
-
- if (driver->directory == NULL)
- return (sysfs_get_driver_devices(driver));
-
- if ((sysfs_refresh_dir_links(driver->directory)) != 0) {
- dprintf("Error refreshing driver links\n");
+ 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;
}
-
- return (sysfs_get_driver_devices(driver));
-}
-
-/**
- * sysfs_get_driver_device: looks up a device from a list of driver's devices
- * and returns its sysfs_device corresponding to it
- * @driver: sysfs_driver on which to search
- * @name: name of the device to search
- * Returns a sysfs_device if found, NULL otherwise
- */
-struct sysfs_device *sysfs_get_driver_device(struct sysfs_driver *driver,
- const char *name)
-{
- struct sysfs_device *device = NULL;
- struct dlist *devlist = NULL;
-
- if (driver == NULL || name == NULL) {
- errno = EINVAL;
+ if (get_driver_bus(driver)) {
+ dprintf("Could not get the bus driver is on\n");
+ sysfs_close_driver(driver);
return NULL;
}
- if (driver->devices == NULL) {
- devlist = sysfs_get_driver_devices(driver);
- if (devlist == NULL) {
- dprintf("Error getting driver devices\n");
- return NULL;
- }
- }
- dlist_for_each_data(driver->devices, device, struct sysfs_device) {
- if (!(strncmp(device->name, name, SYSFS_NAME_LEN)))
- return device;
- }
- return NULL;
+ return driver;
}
/**
static int get_driver_path(const char *bus, const char *drv,
char *path, size_t psize)
{
- if (bus == NULL || drv == NULL || path == NULL || psize == 0) {
+ 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;
}
return 0;
}
-/**
- * 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 char *bus,
- const char *drv, const char *attrib)
-{
- struct sysfs_attribute *attribute = NULL;
- char path[SYSFS_PATH_MAX];
-
- if (bus == NULL || drv == NULL || attrib == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- memset(path, 0, SYSFS_PATH_MAX);
- if ((get_driver_path(bus, drv, path, SYSFS_PATH_MAX)) != 0) {
- dprintf("Error getting to driver %s\n", drv);
- return NULL;
- }
- safestrcat(path, "/");
- safestrcat(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;
- }
- return attribute;
-}
-
/**
* sysfs_open_driver: open driver by name, given its bus
* @bus_name: Name of the bus
char path[SYSFS_PATH_MAX];
struct sysfs_driver *driver = NULL;
- if (drv_name == NULL || bus_name == 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)) != 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(path);
- if (driver == NULL) {
+ 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