pos = strrchr(dev->devpath, '/');
if (pos == NULL)
return;
-
strlcpy(dev->kernel, &pos[1], sizeof(dev->kernel));
dbg("kernel='%s'", dev->kernel);
int len;
char *pos;
+ /* we handle only these devpathes */
+ if (devpath != NULL &&
+ strncmp(devpath, "/devices/", 9) != 0 &&
+ strncmp(devpath, "/subsystem/", 11) != 0 &&
+ strncmp(devpath, "/module/", 8) != 0 &&
+ strncmp(devpath, "/bus/", 5) != 0 &&
+ strncmp(devpath, "/class/", 7) != 0 &&
+ strncmp(devpath, "/block/", 7) != 0)
+ return NULL;
+
dbg("open '%s'", devpath);
strlcpy(devpath_real, devpath, sizeof(devpath_real));
remove_trailing_chars(devpath_real, '/');
+ if (devpath[0] == '\0' )
+ return NULL;
/* look for device already in cache (we never put an untranslated path in the cache) */
list_for_each_entry(dev_loop, &dev_list, node) {
sysfs_device_set_values(dev, devpath_real, NULL, NULL);
- /* get subsystem */
- if (strncmp(dev->devpath, "/class/", 7) == 0) {
+ /* get subsystem name */
+ strlcpy(link_path, sysfs_path, sizeof(link_path));
+ strlcat(link_path, dev->devpath, sizeof(link_path));
+ strlcat(link_path, "/subsystem", sizeof(link_path));
+ len = readlink(link_path, link_target, sizeof(link_target));
+ if (len > 0) {
+ /* get subsystem from "subsystem" link */
+ link_target[len] = '\0';
+ dbg("subsystem link '%s' points to '%s'", link_path, link_target);
+ pos = strrchr(link_target, '/');
+ if (pos != NULL)
+ strlcpy(dev->subsystem, &pos[1], sizeof(dev->subsystem));
+ } else if (strncmp(dev->devpath, "/class/", 7) == 0) {
+ /* get subsystem from class dir */
strlcpy(dev->subsystem, &dev->devpath[7], sizeof(dev->subsystem));
pos = strchr(dev->subsystem, '/');
if (pos != NULL)
pos[0] = '\0';
else
- dev->subsystem[0] = '\0';
+ strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem));
} else if (strncmp(dev->devpath, "/block/", 7) == 0) {
strlcpy(dev->subsystem, "block", sizeof(dev->subsystem));
} else if (strncmp(dev->devpath, "/devices/", 9) == 0) {
pos = strrchr(link_target, '/');
if (pos != NULL)
strlcpy(dev->subsystem, &pos[1], sizeof(dev->subsystem));
- } else {
- /* get subsystem from "subsystem" link */
- strlcpy(link_path, sysfs_path, sizeof(link_path));
- strlcat(link_path, dev->devpath, sizeof(link_path));
- strlcat(link_path, "/subsystem", sizeof(link_path));
- len = readlink(link_path, link_target, sizeof(link_target));
- if (len > 0) {
- link_target[len] = '\0';
- dbg("subsystem link '%s' points to '%s'", link_path, link_target);
- pos = strrchr(link_target, '/');
- if (pos != NULL)
- strlcpy(dev->subsystem, &pos[1], sizeof(dev->subsystem));
- }
- }
- /* get driver name */
- strlcpy(link_path, sysfs_path, sizeof(link_path));
- strlcat(link_path, dev->devpath, sizeof(link_path));
- strlcat(link_path, "/driver", sizeof(link_path));
- len = readlink(link_path, link_target, sizeof(link_target));
- if (len > 0) {
- link_target[len] = '\0';
- dbg("driver link '%s' points to '%s'", link_path, link_target);
- pos = strrchr(link_target, '/');
- if (pos != NULL)
- strlcpy(dev->driver, &pos[1], sizeof(dev->driver));
}
- } else if (strncmp(dev->devpath, "/bus/", 5) == 0 && strstr(dev->devpath, "/drivers/")) {
+ } else if (strstr(dev->devpath, "/drivers/") != NULL) {
strlcpy(dev->subsystem, "drivers", sizeof(dev->subsystem));
} else if (strncmp(dev->devpath, "/module/", 8) == 0) {
strlcpy(dev->subsystem, "module", sizeof(dev->subsystem));
+ } else if (strncmp(dev->devpath, "/subsystem/", 11) == 0) {
+ pos = strrchr(dev->devpath, '/');
+ if (pos == &dev->devpath[10])
+ strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem));
+ } else if (strncmp(dev->devpath, "/bus/", 5) == 0) {
+ pos = strrchr(dev->devpath, '/');
+ if (pos == &dev->devpath[4])
+ strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem));
+ }
+
+ /* get driver name */
+ strlcpy(link_path, sysfs_path, sizeof(link_path));
+ strlcat(link_path, dev->devpath, sizeof(link_path));
+ strlcat(link_path, "/driver", sizeof(link_path));
+ len = readlink(link_path, link_target, sizeof(link_target));
+ if (len > 0) {
+ link_target[len] = '\0';
+ dbg("driver link '%s' points to '%s'", link_path, link_target);
+ pos = strrchr(link_target, '/');
+ if (pos != NULL)
+ strlcpy(dev->driver, &pos[1], sizeof(dev->driver));
}
dbg("add to cache 'devpath=%s', subsystem='%s', driver='%s'", dev->devpath, dev->subsystem, dev->driver);
if (dev->parent != NULL)
return dev->parent;
- /* requesting a parent is only valid for devices */
- if ((strncmp(dev->devpath, "/devices/", 9) != 0) &&
- (strncmp(dev->devpath, "/class/", 7) != 0) &&
- (strncmp(dev->devpath, "/block/", 7) != 0))
- return NULL;
-
strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath));
dbg("'%s'", parent_devpath);
return NULL;
pos[0] = '\0';
- /* are we at the top level of /devices */
- if (strcmp(parent_devpath, "/devices") == 0) {
- dbg("/devices top level");
- return NULL;
- }
-
- /* at the top level of class/block we want to follow the "device" link */
- if (strcmp(parent_devpath, "/block") == 0) {
- dbg("/block top level, look for device link");
- goto device_link;
- }
if (strncmp(parent_devpath, "/class", 6) == 0) {
pos = strrchr(parent_devpath, '/');
if (pos == &parent_devpath[6] || pos == parent_devpath) {
goto device_link;
}
}
+ if (strcmp(parent_devpath, "/block") == 0) {
+ dbg("/block top level, look for device link");
+ goto device_link;
+ }
+
+ /* are we at the top level? */
+ pos = strrchr(parent_devpath, '/');
+ if (pos == NULL || pos == parent_devpath)
+ return NULL;
+
/* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath);
return dev->parent;
out:
return attr->value;
}
+
+int sysfs_lookup_devpath_by_subsys_id(char *devpath_full, size_t len, const char *subsystem, const char *id)
+{
+ size_t sysfs_len;
+ char path_full[PATH_SIZE];
+ char *path;
+ struct stat statbuf;
+
+ sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
+ path = &path_full[sysfs_len];
+
+ if (strcmp(subsystem, "subsystem") == 0) {
+ strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+
+ strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+ goto out;
+
+ strlcpy(path, "/class/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+ }
+
+ if (strcmp(subsystem, "module") == 0) {
+ strlcpy(path, "/module/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+ goto out;
+ }
+
+ if (strcmp(subsystem, "drivers") == 0) {
+ char subsys[NAME_SIZE];
+ char *driver;
+
+ strlcpy(subsys, id, sizeof(subsys));
+ driver = strchr(subsys, ':');
+ if (driver != NULL) {
+ driver[0] = '\0';
+ driver = &driver[1];
+ strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len);
+ strlcat(path, subsys, sizeof(path_full) - sysfs_len);
+ strlcat(path, "/drivers/", sizeof(path_full) - sysfs_len);
+ strlcat(path, driver, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+
+ strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len);
+ strlcat(path, subsys, sizeof(path_full) - sysfs_len);
+ strlcat(path, "/drivers/", sizeof(path_full) - sysfs_len);
+ strlcat(path, driver, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+ }
+ goto out;
+ }
+
+ strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len);
+ strlcat(path, subsystem, sizeof(path_full) - sysfs_len);
+ strlcat(path, "/devices/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+
+ strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len);
+ strlcat(path, subsystem, sizeof(path_full) - sysfs_len);
+ strlcat(path, "/devices/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+
+ strlcpy(path, "/class/", sizeof(path_full) - sysfs_len);
+ strlcat(path, subsystem, sizeof(path_full) - sysfs_len);
+ strlcat(path, "/", sizeof(path_full) - sysfs_len);
+ strlcat(path, id, sizeof(path_full) - sysfs_len);
+ if (stat(path_full, &statbuf) == 0)
+ goto found;
+out:
+ return 0;
+found:
+ if (S_ISLNK(statbuf.st_mode))
+ sysfs_resolve_link(path, sizeof(path_full) - sysfs_len);
+ strlcpy(devpath_full, path, len);
+ return 1;
+}