#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
- * @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
+ * sysfs_close_driver: closes driver and deletes device lists too
* @driver: driver to close
*/
-void sysfs_close_driver_by_name(struct sysfs_driver *driver)
+void sysfs_close_driver(struct sysfs_driver *driver)
{
if (driver != NULL) {
if (driver->devices != NULL)
}
}
+/**
+ * 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;
+}
+
+/**
+ * read_driver_dir: Read driver directory's subdirs and links
+ * @driver: Driver to read
+ * Returns 0 on success and 1 on failure
+ */
+static int read_driver_dir(struct sysfs_driver *driver)
+{
+ if (driver == NULL) {
+ errno = EINVAL;
+ return 1;
+ }
+ if (driver->directory == NULL) {
+ if ((open_driver_dir(driver)) == 1)
+ return 1;
+ }
+ if ((sysfs_read_directory(driver->directory)) != 0) {
+ dprintf("Error reading driver directory at %s\n",
+ driver->path);
+ return 1;
+ }
+ return 0;
+}
+
/**
* alloc_driver: allocates and initializes driver
* returns struct sysfs_driver with success and NULL with error.
struct sysfs_driver *sysfs_open_driver(const unsigned char *path)
{
struct sysfs_driver *driver = NULL;
- struct sysfs_directory *sdir = NULL;
if (path == NULL) {
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);
+ 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);
- sysfs_close_directory(sdir);
return NULL;
}
- strcpy(driver->name, sdir->name);
- driver->directory = sdir;
- strcpy(driver->path, sdir->path);
+ 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;
+ }
+ strcpy(driver->path, path);
return driver;
}
*/
struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
{
- if (driver == NULL || driver->directory == NULL)
+ if (driver == NULL) {
+ 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) {
+ dprintf("Error reading driver attributes\n");
+ return NULL;
+ }
+ } else {
+ if ((sysfs_path_is_dir(driver->path)) != 0) {
+ dprintf("Driver at %s no longer exists\n",
+ driver->path);
+ return NULL;
+ }
+ if ((sysfs_refresh_attributes
+ (driver->directory->attributes)) != 0) {
+ dprintf("Error refreshing driver attributes\n");
+ return NULL;
+ }
+ }
return(driver->directory->attributes);
}
const unsigned char *name)
{
struct sysfs_attribute *cur = NULL;
+ struct dlist *attrlist = NULL;
- if (drv == NULL || drv->directory == NULL
- || drv->directory->attributes == NULL || name == NULL) {
+ if (drv == NULL) {
errno = EINVAL;
return NULL;
}
-
- cur = sysfs_get_directory_attribute(drv->directory,
- (unsigned char *)name);
- if (cur != NULL)
- return cur;
-
+
+ attrlist = sysfs_get_driver_attributes(drv);
+ if (attrlist != NULL) {
+ cur = sysfs_get_directory_attribute(drv->directory,
+ (unsigned char *)name);
+ if (cur != NULL)
+ return cur;
+ }
return NULL;
}
*/
struct dlist *sysfs_get_driver_links(struct sysfs_driver *driver)
{
- if (driver == NULL || driver->directory == NULL)
+ if (driver == NULL) {
+ errno = EINVAL;
return NULL;
-
+ }
+ if (driver->directory == NULL) {
+ if ((open_driver_dir(driver)) == 1)
+ return NULL;
+ if ((read_driver_dir(driver)) != 0)
+ return NULL;
+ }
return(driver->directory->links);
}
+/**
+ * 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)
+{
+ struct sysfs_link *curlink = NULL;
+ struct sysfs_device *device = NULL;
+
+ if (driver == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ if (driver->devices != NULL)
+ return (driver->devices);
+
+ if (driver->directory == NULL) {
+ if ((open_driver_dir(driver)) == 1)
+ return NULL;
+ if ((read_driver_dir(driver)) != 0)
+ 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);
+ return NULL;
+ }
+ strcpy(device->driver_name, driver->name);
+ if (driver->devices == NULL)
+ driver->devices = dlist_new_with_delete
+ (sizeof(struct sysfs_device),
+ sysfs_close_driver_device);
+ dlist_unshift(driver->devices, device);
+ }
+ }
+ return (driver->devices);
+}
+
+/**
+ * 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 unsigned char *name)
+{
+ struct sysfs_device *device = NULL;
+ struct dlist *devlist = NULL;
+
+ if (driver == NULL || name == NULL) {
+ errno = EINVAL;
+ 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;
+}
+
/**
* get_driver_path: looks up the bus the driver is on and builds path to
* the 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 unsigned char *bus,
+ const unsigned char *drv, unsigned char *path, size_t psize)
{
if (bus == NULL || drv == NULL || path == NULL) {
errno = EINVAL;
strcat(path, SYSFS_BUS_NAME);
strcat(path, "/");
strcat(path, bus);
- strcat(path, SYSFS_DRIVERS_DIR);
+ strcat(path, "/");
+ strcat(path, SYSFS_DRIVERS_NAME);
strcat(path, "/");
strcat(path, drv);
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
- */
-struct sysfs_driver *sysfs_open_driver_by_name(const unsigned char *drv_name,
- const unsigned char *bus, size_t bsize)
-{
- 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) {
- errno = EINVAL;
- return NULL;
- }
-
- memset(path, 0, SYSFS_PATH_MAX);
- if (get_driver_path(bus, drv_name, path, SYSFS_PATH_MAX) != 0) {
- 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);
- 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
~ianmdlvl / elogind.git / blobdiff