6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/types.h>
38 #include "udev_version.h"
41 #include "libsysfs/libsysfs.h"
42 #include "klibc_fixups.h"
45 * Right now the major/minor of a device is stored in a file called
47 * The number is stored as:
51 * The value is in decimal.
53 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
59 dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
65 if (sscanf(dev, "%u:%u", &udev->major, &udev->minor) != 2)
68 dbg("found major = %d, minor = %d", udev->major, udev->minor);
76 * we possibly want to add some symlinks here
77 * only numeric owner/group id's are supported
79 static int create_node(struct udevice *dev)
87 strncpy(filename, udev_root, sizeof(filename));
88 strncat(filename, dev->name, sizeof(filename));
91 res = (dev->major << 8) | (dev->minor);
93 res = makedev(dev->major, dev->minor);
102 dev->mode |= S_IFCHR;
105 dev->mode |= S_IFIFO;
108 dbg("unknown node type %c\n", dev->type);
112 /* create subdirectories if requested */
113 if (strchr(dev->name, '/')) {
118 strncpy(path, filename, sizeof(path));
119 pos = strchr(path+1, '/');
121 pos = strchr(pos+1, '/');
125 if (stat(path, &stats)) {
126 retval = mkdir(path, 0755);
128 dbg("mkdir(%s) failed with error '%s'",
129 path, strerror(errno));
132 dbg("created %s", path);
138 dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
139 retval = mknod(filename, dev->mode, res);
141 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
142 filename, dev->mode, dev->major, dev->minor, strerror(errno));
144 dbg("chmod(%s, %#o)", filename, dev->mode);
145 retval = chmod(filename, dev->mode);
147 dbg("chmod(%s, %#o) failed with error '%s'",
148 filename, dev->mode, strerror(errno));
152 unsigned long id = strtoul(dev->owner, &endptr, 10);
156 struct passwd *pw = getpwnam(dev->owner);
158 dbg("user unknown: %s", dev->owner);
166 unsigned long id = strtoul(dev->group, &endptr, 10);
170 struct group *gr = getgrnam(dev->group);
172 dbg("group unknown: %s", dev->group);
179 dbg("chown(%s, %u, %u)", filename, uid, gid);
180 retval = chown(filename, uid, gid);
182 dbg("chown(%s, %u, %u) failed with error '%s'", filename,
183 uid, gid, strerror(errno));
189 static struct sysfs_class_device *get_class_dev(char *device_name)
191 char dev_path[SYSFS_PATH_MAX];
192 struct sysfs_class_device *class_dev = NULL;
194 strcpy(dev_path, sysfs_path);
195 strcat(dev_path, device_name);
197 dbg("looking at %s", dev_path);
199 /* open up the sysfs class device for this thing... */
200 class_dev = sysfs_open_class_device(dev_path);
201 if (class_dev == NULL) {
202 dbg ("sysfs_open_class_device failed");
205 dbg("class_dev->name = %s", class_dev->name);
211 /* wait for the "dev" file to show up in the directory in sysfs.
212 * If it doesn't happen in about 10 seconds, give up.
214 #define SECONDS_TO_WAIT_FOR_DEV 10
215 static int sleep_for_dev(char *path)
217 char filename[SYSFS_PATH_MAX + 6];
218 int loop = SECONDS_TO_WAIT_FOR_DEV;
221 strcpy(filename, sysfs_path);
222 strcat(filename, path);
223 strcat(filename, "/dev");
228 dbg("looking for %s", filename);
229 retval = stat(filename, &buf);
233 /* sleep for a second or two to give the kernel a chance to
234 * create the dev file */
242 int udev_add_device(char *path, char *subsystem)
244 struct sysfs_class_device *class_dev = NULL;
246 int retval = -EINVAL;
248 /* for now, the block layer is the only place where block devices are */
249 if (strcmp(subsystem, "block") == 0)
254 retval = sleep_for_dev(path);
258 class_dev = get_class_dev(path);
259 if (class_dev == NULL)
262 retval = get_major_minor(class_dev, &dev);
264 dbg("get_major_minor failed");
268 retval = namedev_name_device(class_dev, &dev);
272 retval = udevdb_add_dev(path, &dev);
274 dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
275 "But remove might not work properly for this device.");
277 dbg("name = %s", dev.name);
278 retval = create_node(&dev);
282 sysfs_close_class_device(class_dev);