#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;
+}
+
/**
* alloc_driver: allocates and initializes driver
* returns struct sysfs_driver with success and NULL with error.
}
/**
- * sysfs_open_driver: opens and initializes driver structure
+ * 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 unsigned char *path)
+struct sysfs_driver *sysfs_open_driver_path(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);
+ if ((sysfs_remove_trailing_slash(driver->path)) != 0) {
+ dprintf("Invalid path to driver %s\n", driver->path);
+ sysfs_close_driver(driver);
+ return NULL;
+ }
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)
+ return NULL;
+ }
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);
+}
+
/**
* sysfs_get_driver_attr: searches driver's attributes by name
* @drv: driver to look through
struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
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;
}
+
+ attrlist = sysfs_get_driver_attributes(drv);
+ if (attrlist != NULL)
+ return NULL;
- cur = sysfs_get_directory_attribute(drv->directory,
- (unsigned char *)name);
- if (cur != NULL)
- return cur;
-
- return NULL;
+ return sysfs_get_directory_attribute(drv->directory,
+ (unsigned char *)name);
}
/**
*/
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 ((sysfs_read_dir_links(driver->directory)) != 0)
+ return NULL;
+ }
return(driver->directory->links);
}
/**
- * 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)
+ * 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_driver *driver = NULL;
- struct sysfs_device *device = NULL;
struct sysfs_link *curlink = NULL;
- unsigned char path[SYSFS_PATH_MAX];
+ struct sysfs_device *device = NULL;
- if (drv_name == NULL || bus == NULL) {
+ if (driver == NULL) {
errno = EINVAL;
return NULL;
}
+
+ if (driver->devices != NULL)
+ return (driver->devices);
- memset(path, 0, SYSFS_PATH_MAX);
- if (sysfs_get_mnt_path(path, SYSFS_PATH_MAX) != 0) {
- dprintf("Error getting sysfs mount path\n");
- return NULL;
- }
- strcat(path, SYSFS_BUS_DIR);
- strcat(path, "/");
- strcat(path, bus);
- strcat(path, SYSFS_DRIVERS_DIR);
- strcat(path, "/");
- strcat(path, drv_name);
- driver = sysfs_open_driver(path);
- if (driver == NULL) {
- dprintf("Could not open driver %s\n", drv_name);
- return NULL;
+ if (driver->directory == NULL) {
+ if ((open_driver_dir(driver)) == 1)
+ return NULL;
+ if ((sysfs_read_dir_links(driver->directory)) != 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);
+ struct sysfs_link) {
+ device = sysfs_open_device_path(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);
+ strcpy(device->driver_name, driver->name);
if (driver->devices == NULL)
driver->devices = dlist_new_with_delete
(sizeof(struct sysfs_device),
- sysfs_close_driver_by_name_dev);
+ sysfs_close_driver_device);
dlist_unshift(driver->devices, device);
}
}
- return driver;
+ 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;
+ return NULL;
+ }
+
+ if (driver->devices != NULL) {
+ dlist_destroy(driver->devices);
+ driver->devices = 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");
+ 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 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.
+ * @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 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)
{
- unsigned char bus_name[SYSFS_NAME_LEN];
-
- if (drv == NULL || path == NULL) {
+ if (bus == NULL || drv == NULL || path == NULL) {
errno = EINVAL;
return -1;
}
- memset(bus_name, 0, SYSFS_NAME_LEN);
- memset(path, 0, SYSFS_PATH_MAX);
- if ((sysfs_find_driver_bus(drv, bus_name, SYSFS_NAME_LEN)) < 0) {
- dprintf("Driver %s not found\n", drv);
- return -1;
- }
- if (sysfs_get_mnt_path(path, SYSFS_PATH_MAX) != 0) {
+ if (sysfs_get_mnt_path(path, psize) != 0) {
dprintf("Error getting sysfs mount path\n");
return -1;
}
- strcat(path, SYSFS_BUS_DIR);
strcat(path, "/");
- strcat(path, bus_name);
- strcat(path, SYSFS_DRIVERS_DIR);
+ strcat(path, SYSFS_BUS_NAME);
+ strcat(path, "/");
+ strcat(path, bus);
+ strcat(path, "/");
+ strcat(path, SYSFS_DRIVERS_NAME);
strcat(path, "/");
strcat(path, drv);
- fprintf(stdout, "get_driver_path %s\n", path);
return 0;
}
/**
- * sysfs_write_driver_attr: modify "writable" driver attribute
- * @drv: driver whose attribute has to be modified
- * @attrib: Attribute to be modified
- * @value: Value to change to
- * Returns 0 on success -1 on failure
+ * 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
*/
-int sysfs_write_driver_attr(unsigned char *drv, unsigned char *attrib,
- unsigned char *value, size_t len)
+struct sysfs_attribute *sysfs_open_driver_attr(const unsigned char *bus,
+ const unsigned char *drv, const unsigned char *attrib)
{
struct sysfs_attribute *attribute = NULL;
unsigned char path[SYSFS_PATH_MAX];
- if (drv == NULL || attrib == NULL || value == NULL) {
+ if (bus == NULL || drv == NULL || attrib == NULL) {
errno = EINVAL;
- return -1;
+ return NULL;
}
memset(path, 0, SYSFS_PATH_MAX);
- if ((get_driver_path(drv, path, SYSFS_PATH_MAX)) != 0) {
+ if ((get_driver_path(bus, drv, path, SYSFS_PATH_MAX)) != 0) {
dprintf("Error getting to driver %s\n", drv);
- return -1;
+ return NULL;
}
strcat(path, "/");
strcat(path, attrib);
attribute = sysfs_open_attribute(path);
if (attribute == NULL) {
- dprintf("Attribute %s could not be retrieved for driver %s\n",
- attrib, drv);
- return -1;
- }
- if (attribute->method & SYSFS_METHOD_SHOW) {
- if ((sysfs_read_attribute(attribute)) != 0) {
- dprintf("Error reading attribute %s for driver %s\n",
- attrib, drv);
- sysfs_close_attribute(attribute);
- return -1;
- }
+ dprintf("Error opening attribute %s for driver %s\n",
+ attrib, drv);
+ return NULL;
}
- if ((sysfs_write_attribute(attribute, value, len)) < 0) {
- dprintf("Error setting %s to %s\n", attrib, value);
+ if ((sysfs_read_attribute(attribute)) != 0) {
+ dprintf("Error reading attribute %s for driver %s\n",
+ attrib, drv);
sysfs_close_attribute(attribute);
- return -1;
+ return NULL;
}
- sysfs_close_attribute(attribute);
- return 0;
+ return attribute;
}
/**
- * sysfs_read_driver_attr: read the user supplied driver attribute
- * @drv: driver whose attribute has to be read
- * @attrib: Attribute to be read
- * @value: Buffer to return the read value
- * @len: Length of the buffer "value"
- * Returns 0 on success -1 on failure
- */
-int sysfs_read_driver_attr(unsigned char *drv, unsigned char *attrib,
- unsigned char *value, size_t len)
+ * sysfs_open_driver: open driver by name, given its bus
+ * @drv_name: Name of the driver
+ * @bus_name: Name of the bus
+ * Returns the sysfs_driver reference on success and NULL on failure
+ */
+struct sysfs_driver *sysfs_open_driver(const unsigned char *drv_name,
+ const unsigned char *bus_name)
{
- struct sysfs_attribute *attribute = NULL;
unsigned char path[SYSFS_PATH_MAX];
+ struct sysfs_driver *driver = NULL;
- if (drv == NULL || attrib == NULL || value == NULL) {
+ if (drv_name == NULL || bus_name == NULL) {
errno = EINVAL;
- return -1;
+ return NULL;
}
- memset(path, 0, SYSFS_NAME_LEN);
- if ((get_driver_path(drv, path, SYSFS_PATH_MAX)) != 0) {
- dprintf("Error getting to driver %s\n", drv);
- return -1;
- }
- 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 -1;
- }
- if (!(attribute->method & SYSFS_METHOD_SHOW)) {
- dprintf("Show method not supported for attribute %s\n",
- attrib);
- sysfs_close_attribute(attribute);
- return -1;
- }
- if ((sysfs_read_attribute(attribute)) != 0) {
- dprintf("Error reading attribute %s for driver %s\n",
- attrib, drv);
- sysfs_close_attribute(attribute);
- return -1;
+ memset(path, 0, SYSFS_PATH_MAX);
+ if ((get_driver_path(bus_name, drv_name, path, SYSFS_PATH_MAX)) != 0) {
+ dprintf("Error getting to driver %s\n", drv_name);
+ return NULL;
}
- if (attribute->len > len) {
- dprintf("Value length %d is larger than supplied buffer %d\n",
- attribute->len, len);
- sysfs_close_attribute(attribute);
- return -1;
+ driver = sysfs_open_driver_path(path);
+ if (driver == NULL) {
+ dprintf("Error opening driver at %s\n", path);
+ return NULL;
}
- strncpy(value, attribute->value, attribute->len);
- value[(attribute->len)+1] = 0;
- sysfs_close_attribute(attribute);
- return 0;
+ return driver;
}
~ianmdlvl / elogind.git / blobdiff