return(driver->directory->links);
}
+/**
+ * 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 *bus, const unsigned char *drv,
+ unsigned char *path, size_t psize)
+{
+ if (bus == NULL || drv == NULL || path == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ 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);
+ strcat(path, SYSFS_DRIVERS_DIR);
+ 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.
}
memset(path, 0, SYSFS_PATH_MAX);
- if (sysfs_get_mnt_path(path, SYSFS_PATH_MAX) != 0) {
- dprintf("Error getting sysfs mount path\n");
+ if (get_driver_path(bus, drv_name, path, SYSFS_PATH_MAX) != 0) {
+ dprintf("Error getting to driver %s\n", drv_name);
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 driver;
}
-/**
- * get_driver_path: looks up the bus the driver is on and builds path to
- * the driver.
- * @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)
-{
- unsigned char bus_name[SYSFS_NAME_LEN];
-
- if (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) {
- 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, "/");
- 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
- */
-int sysfs_write_driver_attr(unsigned char *drv, unsigned char *attrib,
- unsigned char *value, size_t len)
-{
- struct sysfs_attribute *attribute = NULL;
- unsigned char path[SYSFS_PATH_MAX];
-
- if (drv == NULL || attrib == NULL || value == NULL) {
- errno = EINVAL;
- return -1;
- }
-
- memset(path, 0, SYSFS_PATH_MAX);
- 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("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;
- }
- }
- if ((sysfs_write_attribute(attribute, value, len)) < 0) {
- dprintf("Error setting %s to %s\n", attrib, value);
- sysfs_close_attribute(attribute);
- return -1;
- }
- sysfs_close_attribute(attribute);
- return 0;
-}
/**
- * sysfs_read_driver_attr: read the user supplied driver attribute
+ * 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
- * @value: Buffer to return the read value
- * @len: Length of the buffer "value"
- * Returns 0 on success -1 on failure
+ * 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_read_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_NAME_LEN);
- 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);
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;
+ return NULL;
}
if ((sysfs_read_attribute(attribute)) != 0) {
dprintf("Error reading attribute %s for driver %s\n",
attrib, drv);
sysfs_close_attribute(attribute);
- return -1;
- }
- if (attribute->len > len) {
- dprintf("Value length %d is larger than supplied buffer %d\n",
- attribute->len, len);
- sysfs_close_attribute(attribute);
- return -1;
+ return NULL;
}
- strncpy(value, attribute->value, attribute->len);
- value[(attribute->len)+1] = 0;
- sysfs_close_attribute(attribute);
- return 0;
+ return attribute;
}
~ianmdlvl / elogind.git / blobdiff