X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=libsysfs%2Fsysfs_driver.c;h=695ca794f1ac68ae95252439ca57e05a2e349266;hb=1d936fbca0b93dd9cc7a71983ca1a8ea890f181d;hp=6813c85f1484cb9207c9ee728196e102b2f5c794;hpb=070f54223f66490e9d25719c495e074f77da8985;p=elogind.git

diff --git a/libsysfs/sysfs_driver.c b/libsysfs/sysfs_driver.c
index 6813c85f1..695ca794f 100644
--- a/libsysfs/sysfs_driver.c
+++ b/libsysfs/sysfs_driver.c
@@ -3,7 +3,7 @@
  *
  * Driver utility functions for libsysfs
  *
- * Copyright (C) 2003 International Business Machines, Inc.
+ * Copyright (C) IBM Corp. 2003
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
@@ -23,18 +23,47 @@
 #include "libsysfs.h"
 #include "sysfs.h"
 
-/**
- * sysfs_close_driver: closes and cleans up driver structure
+static void sysfs_close_driver_device(void *device)
+{
+	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) 
+			dlist_destroy(driver->devices);
 		if (driver->directory != NULL)
 			sysfs_close_directory(driver->directory);
 		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
@@ -46,44 +75,299 @@ 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 char *path)
+struct sysfs_driver *sysfs_open_driver_path(const unsigned char *path)
 {
 	struct sysfs_driver *driver = NULL;
-	struct sysfs_directory *sdir = NULL;
-	char devname[SYSFS_NAME_LEN];
 
 	if (path == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
-	sdir = sysfs_open_directory(path);
-	if (sdir == NULL) {
-		dprintf (stderr, "Error opening directory %s\n", path);
-		return NULL;
-	}
-	if ((sysfs_read_directory(sdir)) != 0) {
-		dprintf (stderr, "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(stderr, "Error allocating driver at %s\n", path);
-		sysfs_close_directory(sdir);
+		dprintf("Error allocating driver at %s\n", path);
 		return NULL;
 	}
-	if ((sysfs_get_name_from_path(path, devname, SYSFS_NAME_LEN)) != 0) {
-		dprintf (stderr, "Error reading directory %s\n", path);
-		sysfs_close_directory(sdir);
+	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;
 	}
-	strncpy(driver->name, devname, sizeof(driver->name));
-	driver->directory = sdir;	
+	strcpy(driver->path, path);
 	
 	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) {
+		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);
+}
+
+/**
+ * sysfs_get_driver_attr: searches driver's attributes by name
+ * @drv: driver to look through
+ * @name: attribute name to get
+ * returns sysfs_attribute reference on success or NULL with error
+ */ 
+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) {
+                errno = EINVAL;
+                return NULL;
+        }
+	
+	attrlist = sysfs_get_driver_attributes(drv);
+	if (attrlist != NULL) 
+		cur = sysfs_get_directory_attribute(drv->directory,
+						(unsigned char *)name);
+        return cur;
+}
+
+/**
+ * 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
+ */
+struct dlist *sysfs_get_driver_links(struct sysfs_driver *driver)
+{
+	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_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 ((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_path(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.
+ * @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;
+	}
+	if (sysfs_trailing_slash(path) == 0)
+		strcat(path, "/");
+	strcat(path, SYSFS_BUS_NAME);
+	strcat(path, "/");
+	strcat(path, bus);
+	strcat(path, "/");
+	strcat(path, SYSFS_DRIVERS_NAME);
+	strcat(path, "/");
+	strcat(path, drv);
+	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 unsigned char *bus, 
+		const unsigned char *drv, const unsigned char *attrib)
+{
+	struct sysfs_attribute *attribute = NULL;
+	unsigned 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;
+	}
+	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 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
+ * @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;
+}
+