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-rw-r--r--libsysfs/sysfs_bus.c301
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;
+}