1 files changed, 301 insertions, 0 deletions
diff --git a/libsysfs/sysfs_bus.c b/libsysfs/sysfs_bus.c
new file mode 100644
index 0000000000..b2e2b2dd71
--- /dev/null
+++ b/libsysfs/sysfs_bus.c
@@ -0,0 +1,301 @@
+/*
+ * sysfs_bus.c
+ *
+ * Generic bus utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_close_bus: close single bus
+ * @bus: bus structure
+ */
+void sysfs_close_bus(struct sysfs_bus *bus)
+{
+	struct sysfs_device *curdev = NULL, *nextdev = NULL;
+	struct sysfs_driver *curdrv = NULL, *nextdrv = NULL;
+
+	if (bus != NULL) {
+		if (bus->directory != NULL)
+			sysfs_close_directory(bus->directory);
+		for (curdev = bus->devices; curdev != NULL;
+		     curdev = nextdev) {
+			nextdev = curdev->next;
+			sysfs_close_device(curdev);
+		}
+		for (curdrv = bus->drivers; curdrv != NULL;
+		     curdrv = nextdrv) {
+			nextdrv = curdrv->next;
+			sysfs_close_driver(curdrv);
+		}
+		free(bus);
+	}
+}
+
+/**
+ * alloc_bus: mallocs new bus structure
+ * returns sysfs_bus_bus struct or NULL
+ */
+static struct sysfs_bus *alloc_bus(void)
+{
+	return (struct sysfs_bus *)calloc(1, sizeof(struct sysfs_bus));
+}
+
+/**
+ * open_bus_dir: opens up sysfs bus directory
+ * returns sysfs_directory struct with success and NULL with error
+ */
+static struct sysfs_directory *open_bus_dir(const char *name)
+{
+	struct sysfs_directory *busdir = NULL, *cur = NULL, *next = NULL;
+	char buspath[SYSFS_PATH_MAX];
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(buspath, 0, SYSFS_PATH_MAX);
+	if ((sysfs_get_mnt_path(buspath, SYSFS_PATH_MAX)) != 0) {
+		dprintf(stderr, "Sysfs not supported on this system\n");
+		return NULL;
+	}
+
+	strcat(buspath, SYSFS_BUS_DIR);
+	strcat(buspath, "/");
+	strcat(buspath, name);
+	busdir = sysfs_open_directory(buspath);
+	if (busdir == NULL) {
+		errno = EINVAL;
+		dprintf(stderr,"Bus %s not supported on this system\n",
+			name);
+		return NULL;
+	}
+	if ((sysfs_read_directory(busdir)) != 0) {
+		dprintf(stderr, "Error reading %s bus dir %s\n", name, 
+			buspath);
+		sysfs_close_directory(busdir);
+		return NULL;
+	}
+	/* read in devices and drivers subdirs */
+	for (cur = busdir->subdirs; cur != NULL; cur = next) {
+		next = cur->next;
+		if ((sysfs_read_directory(cur)) != 0)
+			continue;
+	}
+
+	return busdir;
+}
+
+/**
+ * add_dev_to_bus: adds a bus device to bus device list
+ * @bus: bus to add the device
+ * @dev: device to add
+ */
+static void add_dev_to_bus(struct sysfs_bus *bus, struct sysfs_device *dev)
+{
+	if (bus != NULL && dev != NULL) {
+		dev->next = bus->devices;
+		bus->devices = dev;
+	}
+}
+
+/**
+ * add_driver_to_bus: adds a bus driver to bus driver list
+ * @bus: bus to add driver to
+ * @driver: driver to add
+ */
+static void add_driver_to_bus(struct sysfs_bus *bus, 
+				struct sysfs_driver *driver)
+{
+	if (bus != NULL && driver != NULL) {
+		driver->next = bus->drivers;
+		bus->drivers = driver;
+	}
+}
+
+/**
+ * get_all_bus_devices: gets all devices for bus
+ * @bus: bus to get devices for
+ * returns 0 with success and -1 with failure
+ */
+static int get_all_bus_devices(struct sysfs_bus *bus)
+{
+	struct sysfs_device *bdev = NULL;
+	struct sysfs_directory *cur = NULL;
+	struct sysfs_dlink *curl = NULL, *nextl = NULL;
+	char dirname[SYSFS_NAME_LEN];
+
+	if (bus == NULL || bus->directory == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	for (cur = bus->directory->subdirs; cur != NULL; cur = cur->next) {
+		memset(dirname, 0, SYSFS_NAME_LEN);
+		if ((sysfs_get_name_from_path(cur->path, dirname,
+		    SYSFS_NAME_LEN)) != 0)
+			continue;
+		if (strcmp(dirname, SYSFS_DEVICES_NAME) != 0)
+			continue;
+		for (curl = cur->links; curl != NULL; curl = nextl) {
+			nextl = curl->next;
+			bdev = sysfs_open_device(curl->target->path);
+			if (bdev == NULL) {
+				dprintf(stderr, "Error opening device at %s\n",
+					curl->target->path);
+				continue;
+			}
+			add_dev_to_bus(bus, bdev);
+		}
+	}
+			
+	return 0;
+}
+
+/**
+ * get_all_bus_drivers: get all pci drivers
+ * @bus: pci bus to add drivers to
+ * returns 0 with success and -1 with error
+ */
+static int get_all_bus_drivers(struct sysfs_bus *bus)
+{
+	struct sysfs_driver *driver = NULL;
+	struct sysfs_directory *cur = NULL, *next = NULL;
+	struct sysfs_directory *cursub = NULL, *nextsub = NULL;
+	char dirname[SYSFS_NAME_LEN];
+
+	if (bus == NULL || bus->directory == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	for (cur = bus->directory->subdirs; cur != NULL; cur = next) {
+		next = cur->next;
+		memset(dirname, 0, SYSFS_NAME_LEN);
+		if ((sysfs_get_name_from_path(cur->path, dirname,
+		    SYSFS_NAME_LEN)) != 0)
+			continue;
+		if (strcmp(dirname, SYSFS_DRIVERS_NAME) != 0)
+			continue;
+		for (cursub = cur->subdirs; cursub != NULL; cursub = nextsub) {
+			nextsub = cursub->next;
+			driver = sysfs_open_driver(cursub->path);
+			if (driver == NULL) {
+				dprintf(stderr, "Error opening driver at %s\n",
+					cursub->path);
+				continue;
+			}
+			add_driver_to_bus(bus, driver);
+		}
+	}
+	
+	return 0;
+}
+
+/**
+ * match_bus_device_to_driver: returns 1 if device is bound to driver
+ * @driver: driver to match
+ * @busid: busid of device to match
+ * returns 1 if found and 0 if not found
+ */
+static int match_bus_device_to_driver(struct sysfs_driver *driver, char *busid)
+{
+	struct sysfs_dlink *cur = NULL, *next = NULL;
+	int found = 0;
+
+	if (driver == NULL || driver->directory == NULL || busid == NULL) {
+		errno = EINVAL;
+		return found;
+	}
+	for (cur = driver->directory->links; cur != NULL && found == 0;
+	     cur = next) {
+		next = cur->next;
+		if ((strcmp(cur->name, busid)) == 0)
+			found++;
+	}
+	return found;
+}
+
+/**
+ * link_bus_devices_to_drivers: goes through and links devices to drivers
+ * @bus: bus to link
+ */
+static void link_bus_devices_to_drivers(struct sysfs_bus *bus)
+{
+	struct sysfs_device *dev = NULL, *nextdev = NULL;
+	struct sysfs_driver *drv = NULL, *nextdrv = NULL;
+	
+	if (bus != NULL && bus->devices != NULL && bus->drivers != NULL) {
+		for (dev = bus->devices; dev != NULL; dev = nextdev) {
+			nextdev = dev->next;
+
+			for (drv = bus->drivers; drv != NULL; drv = nextdrv) {
+				nextdrv = drv->next;
+				if ((match_bus_device_to_driver(drv, 
+				    dev->bus_id)) != 0) {
+					dev->driver = drv;
+					drv->device = dev;
+				}
+			}
+		}
+	}
+}
+
+/**
+ * sysfs_open_bus: opens specific bus and all its devices on system
+ * returns sysfs_bus structure with success or NULL with error.
+ */
+struct sysfs_bus *sysfs_open_bus(const char *name)
+{
+	struct sysfs_bus *bus = NULL;
+	struct sysfs_directory *busdir = NULL;
+
+	if (name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	bus = alloc_bus();
+	if (bus == NULL) {
+		perror("malloc");
+		return NULL;
+	}
+	strcpy(bus->name, name);	
+	busdir = open_bus_dir(name);
+	if (busdir == NULL) {
+		dprintf(stderr,"Invalid bus, %s not supported on this system\n",
+			name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	bus->directory = busdir;
+	if ((get_all_bus_devices(bus)) != 0) {
+		dprintf(stderr, "Error reading %s bus devices\n", name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	if ((get_all_bus_drivers(bus)) != 0) {
+		dprintf(stderr, "Error reading %s bus drivers\n", name);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+	link_bus_devices_to_drivers(bus);
+
+	return bus;
+}