X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=libsysfs%2Fsysfs_driver.c;h=a4440cfdf9f9e5daa4a7f42c1f4682e8192b0de8;hb=a695feaeff0551745e1a397be2daa61b8cd0cc42;hp=4372b19f10f6c033fa8653390fa3fa7e01230c6c;hpb=5d4754f19521568b775ba7a31465d3af192ce382;p=elogind.git

diff --git a/libsysfs/sysfs_driver.c b/libsysfs/sysfs_driver.c
index 4372b19f1..a4440cfdf 100644
--- a/libsysfs/sysfs_driver.c
+++ b/libsysfs/sysfs_driver.c
@@ -65,29 +65,6 @@ static int open_driver_dir(struct sysfs_driver *driver)
 	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.
@@ -98,11 +75,11 @@ static struct sysfs_driver *alloc_driver(void)
 }
 
 /**
- * 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;
 
@@ -126,6 +103,11 @@ struct sysfs_driver *sysfs_open_driver(const unsigned char *path)
 		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;
 }
@@ -148,25 +130,37 @@ struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
 			return NULL;
 	}
 	if (driver->directory->attributes == NULL) {
-		if ((sysfs_read_dir_attributes(driver->directory)) != 0) {
-			dprintf("Error reading driver attributes\n");
+		if ((sysfs_read_dir_attributes(driver->directory)) != 0) 
 			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);
 }
 
+/**
+ * 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
@@ -176,7 +170,6 @@ struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
 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) {
@@ -185,13 +178,11 @@ struct sysfs_attribute *sysfs_get_driver_attr(struct sysfs_driver *drv,
         }
 	
 	attrlist = sysfs_get_driver_attributes(drv);
-	if (attrlist != NULL) {
-		cur = sysfs_get_directory_attribute(drv->directory,
+	if (attrlist != NULL) 
+		return NULL;
+
+	return sysfs_get_directory_attribute(drv->directory,
 						(unsigned char *)name);
-	        if (cur != NULL)
-        	        return cur;
-	}
-        return NULL;
 }
 
 /**
@@ -209,7 +200,7 @@ struct dlist *sysfs_get_driver_links(struct sysfs_driver *driver)
 	if (driver->directory == NULL) {
 		if ((open_driver_dir(driver)) == 1)
 			return NULL;
-		if ((read_driver_dir(driver)) != 0) 
+		if ((sysfs_read_dir_links(driver->directory)) != 0) 
 			return NULL;
 	}
 	return(driver->directory->links);
@@ -236,13 +227,13 @@ struct dlist *sysfs_get_driver_devices(struct sysfs_driver *driver)
 	if (driver->directory == NULL) {
 		if ((open_driver_dir(driver)) == 1) 
 			return NULL;
-		if ((read_driver_dir(driver)) != 0) 
+		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);
+			device = sysfs_open_device_path(curlink->target);
 			if (device == NULL) {
 				dprintf("Error opening device at %s\n", 
 						curlink->target);
@@ -259,6 +250,38 @@ struct dlist *sysfs_get_driver_devices(struct sysfs_driver *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
@@ -311,8 +334,7 @@ static int get_driver_path(const unsigned char *bus,
 		dprintf("Error getting sysfs mount path\n");
 		return -1;
 	}
-	if (sysfs_trailing_slash(path) == 0)
-		strcat(path, "/");
+	strcat(path, "/");
 	strcat(path, SYSFS_BUS_NAME);
 	strcat(path, "/");
 	strcat(path, bus);
@@ -345,7 +367,7 @@ struct sysfs_attribute *sysfs_open_driver_attr(const unsigned char *bus,
 		return NULL;
 	}
 
-	memset(path, 0, SYSFS_NAME_LEN);
+	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;
@@ -367,3 +389,33 @@ struct sysfs_attribute *sysfs_open_driver_attr(const unsigned char *bus,
 	return attribute;
 }
 
+/**
+ * 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)
+{
+	unsigned char path[SYSFS_PATH_MAX];
+	struct sysfs_driver *driver = NULL;
+
+	if (drv_name == NULL || bus_name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	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;
+	}
+	driver = sysfs_open_driver_path(path);
+	if (driver == NULL) {
+		dprintf("Error opening driver at %s\n", path);
+		return NULL;
+	}
+	return driver;
+}
+