2 * udev_sysfs.c - sysfs linux kernel specific knowledge
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation version 2 of the License.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include "libsysfs/sysfs/libsysfs.h"
32 #include "udev_version.h"
33 #include "udev_sysfs.h"
34 #include "udev_utils.h"
37 /* list of subsystem specific files, NULL if there is no file to wait for */
38 static const struct subsystem_file {
39 const char *subsystem;
41 } subsystem_files[] = {
42 { .subsystem = "class", .file = NULL },
43 { .subsystem = "net", .file = "ifindex" },
44 { .subsystem = "scsi_host", .file = "unique_id" },
45 { .subsystem = "scsi_device", .file = NULL },
46 { .subsystem = "pcmcia_socket", .file = "card_type" },
47 { .subsystem = "usb_host", .file = NULL },
48 { .subsystem = "bluetooth", .file = "address" },
49 { .subsystem = "firmware", .file = "data" },
50 { .subsystem = "i2c-adapter", .file = NULL },
51 { .subsystem = "pci_bus", .file = NULL },
52 { .subsystem = "ieee1394", .file = NULL },
53 { .subsystem = "ieee1394_host", .file = NULL },
54 { .subsystem = "ieee1394_node", .file = NULL },
55 { .subsystem = "fc_transport", .file = "port_id" },
56 { .subsystem = "fc_host", .file = "port_id" },
57 { .subsystem = "spi_transport", .file = "width" },
58 { .subsystem = "spi_host", .file = "width" },
62 dev_t get_devt(struct sysfs_class_device *class_dev)
64 struct sysfs_attribute *attr = NULL;
65 unsigned int major, minor;
67 attr = sysfs_get_classdev_attr(class_dev, "dev");
70 dbg("dev='%s'", attr->value);
72 if (sscanf(attr->value, "%u:%u", &major, &minor) != 2)
74 dbg("found major=%d, minor=%d", major, minor);
76 return makedev(major, minor);
79 int subsystem_expect_no_dev(const char *subsystem)
81 const struct subsystem_file *file;
83 for (file = subsystem_files; file->subsystem != NULL; file++)
84 if (strcmp(subsystem, file->subsystem) == 0)
90 /* get subsystem specific files, returns "dev" if no other found */
91 static const char *get_subsystem_specific_file(const char *subsystem)
93 const struct subsystem_file *file;
95 /* look if we want to look for another file instead of "dev" */
96 for (file = subsystem_files; file->subsystem != NULL; file++)
97 if (strcmp(subsystem, file->subsystem) == 0)
103 /* wait for class pecific file to show up */
104 static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
108 char filename[SYSFS_PATH_MAX];
111 file = get_subsystem_specific_file(class_dev->classname);
113 dbg("class '%s' has no file to wait for", class_dev->classname);
117 snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", class_dev->path, file);
118 dbg("looking at class '%s' for specific file '%s'", class_dev->classname, filename);
120 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
124 if (stat(class_dev->path, &stats) == -1) {
125 dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
129 if (stat(filename, &stats) == 0) {
130 dbg("class '%s' specific file '%s' found", class_dev->classname, file);
134 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
137 dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
139 *error = "class specific file unavailable";
143 /* check if we need to wait for a physical device */
144 static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
146 /* list of devices without a "device" symlink to the physical device
147 * if device is set to NULL, no devices in that subsystem has a link */
148 static const struct class_device {
149 const char *subsystem;
152 { .subsystem = "block", .device = "double" },
153 { .subsystem = "block", .device = "nb" },
154 { .subsystem = "block", .device = "ram" },
155 { .subsystem = "block", .device = "loop" },
156 { .subsystem = "block", .device = "fd" },
157 { .subsystem = "block", .device = "md" },
158 { .subsystem = "block", .device = "dos_cd" },
159 { .subsystem = "block", .device = "rflash" },
160 { .subsystem = "block", .device = "rom" },
161 { .subsystem = "block", .device = "rrom" },
162 { .subsystem = "block", .device = "flash" },
163 { .subsystem = "block", .device = "msd" },
164 { .subsystem = "block", .device = "sbpcd" },
165 { .subsystem = "block", .device = "pcd" },
166 { .subsystem = "block", .device = "pf" },
167 { .subsystem = "block", .device = "scd" },
168 { .subsystem = "block", .device = "ubd" },
169 { .subsystem = "block", .device = "dm-" },
170 { .subsystem = "block", .device = "bcrypt" },
171 { .subsystem = "input", .device = "event" },
172 { .subsystem = "input", .device = "mice" },
173 { .subsystem = "input", .device = "mouse" },
174 { .subsystem = "input", .device = "ts" },
175 { .subsystem = "input", .device = "js" },
176 { .subsystem = "vc", .device = NULL },
177 { .subsystem = "tty", .device = NULL },
178 { .subsystem = "cpuid", .device = "cpu" },
179 { .subsystem = "graphics", .device = "fb" },
180 { .subsystem = "mem", .device = NULL },
181 { .subsystem = "misc", .device = NULL },
182 { .subsystem = "msr", .device = NULL },
183 { .subsystem = "netlink", .device = NULL },
184 { .subsystem = "net", .device = "sit" },
185 { .subsystem = "net", .device = "lo" },
186 { .subsystem = "net", .device = "tap" },
187 { .subsystem = "net", .device = "ipsec" },
188 { .subsystem = "net", .device = "dummy" },
189 { .subsystem = "net", .device = "irda" },
190 { .subsystem = "net", .device = "ppp" },
191 { .subsystem = "net", .device = "tun" },
192 { .subsystem = "net", .device = "pan" },
193 { .subsystem = "net", .device = "bnep" },
194 { .subsystem = "net", .device = "vmnet" },
195 { .subsystem = "net", .device = "ippp" },
196 { .subsystem = "net", .device = "nlv" },
197 { .subsystem = "net", .device = "atml" },
198 { .subsystem = "ppp", .device = NULL },
199 { .subsystem = "sound", .device = NULL },
200 { .subsystem = "printer", .device = "lp" },
201 { .subsystem = "ppdev", .device = NULL },
202 { .subsystem = "nvidia", .device = NULL },
203 { .subsystem = "video4linux", .device = "vbi" },
204 { .subsystem = "dvb", .device = NULL },
205 { .subsystem = "lirc", .device = NULL },
206 { .subsystem = "firmware", .device = NULL },
207 { .subsystem = "drm", .device = NULL },
208 { .subsystem = "pci_bus", .device = NULL },
209 { .subsystem = "ieee1394", .device = NULL },
210 { .subsystem = "ieee1394_host", .device = NULL },
211 { .subsystem = "ieee1394_node", .device = NULL },
212 { .subsystem = "raw", .device = NULL },
213 { .subsystem = "zaptel", .device = NULL },
214 { .subsystem = "tiglusb", .device = NULL },
215 { .subsystem = "ppdev", .device = NULL },
216 { .subsystem = "ticables", .device = NULL },
217 { .subsystem = "snsc", .device = NULL },
218 { .subsystem = "staliomem", .device = NULL },
219 { .subsystem = "tape", .device = NULL },
220 { .subsystem = "ip2", .device = NULL },
221 { .subsystem = "tpqic02", .device = NULL },
222 { .subsystem = "dsp56k", .device = NULL },
223 { .subsystem = "zft", .device = NULL },
224 { .subsystem = "adb", .device = NULL },
225 { .subsystem = "cosa", .device = NULL },
226 { .subsystem = "pg", .device = NULL },
227 { .subsystem = "pt", .device = NULL },
228 { .subsystem = "capi", .device = NULL },
231 const struct class_device *classdevice;
234 /* the kernel may tell us what to wait for */
235 if (kernel_release_satisfactory(2,6,10) > 0)
236 if (getenv("PHYSDEVPATH") == NULL) {
237 dbg("the kernel says, that there is no physical device for '%s'", class_dev->path);
241 for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
242 if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
243 /* see if no device in this class is expected to have a device-link */
244 if (classdevice->device == NULL)
247 len = strlen(classdevice->device);
249 /* see if device name matches */
250 if (strncmp(class_dev->name, classdevice->device, len) != 0)
253 /* exact name match */
254 if (strlen(class_dev->name) == len)
257 /* name match with instance number */
258 if (isdigit(class_dev->name[len]))
266 /* skip waiting for the bus of the devices device */
267 static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
269 static const char *devices_without_bus[] = {
277 for (device = devices_without_bus; *device != NULL; device++) {
278 int len = strlen(*device);
280 if (strncmp(class_dev->classname, *device, len) == 0)
287 /* wait for a devices device specific file to show up */
288 int wait_for_devices_device(struct sysfs_device *devices_dev,
291 static const struct device_file {
295 { .bus = "scsi", .file = "vendor" },
296 { .bus = "usb", .file = "idVendor" },
297 { .bus = "usb", .file = "iInterface" },
298 { .bus = "usb", .file = "bNumEndpoints" },
299 { .bus = "usb-serial", .file = "detach_state" },
300 { .bus = "ide", .file = "detach_state" },
301 { .bus = "pci", .file = "vendor" },
302 { .bus = "platform", .file = "detach_state" },
303 { .bus = "pcmcia", .file = "detach_state" },
304 { .bus = "i2c", .file = "detach_state" },
305 { .bus = "ieee1394", .file = "node_count" },
306 { .bus = "ieee1394", .file = "nodeid" },
307 { .bus = "ieee1394", .file = "address" },
308 { .bus = "bttv-sub", .file = NULL },
309 { .bus = "pnp", .file = "detach_state" },
310 { .bus = "eisa", .file = "detach_state" },
311 { .bus = "serio", .file = "detach_state" },
312 { .bus = "pseudo", .file = "detach_state" },
313 { .bus = "mmc", .file = "detach_state" },
314 { .bus = "macio", .file = "detach_state" },
315 { .bus = "of_platform", .file = "detach_state" },
316 { .bus = "vio", .file = "detach_state" },
317 { .bus = "ecard", .file = "detach_state" },
318 { .bus = "sa1111-rab", .file = "detach_state" },
319 { .bus = "amba", .file = "detach_state" },
320 { .bus = "locomo-bus", .file = "detach_state" },
321 { .bus = "logicmodule", .file = "detach_state" },
322 { .bus = "parisc", .file = "detach_state" },
323 { .bus = "ocp", .file = "detach_state" },
324 { .bus = "dio", .file = "detach_state" },
325 { .bus = "MCA", .file = "detach_state" },
326 { .bus = "wl", .file = "detach_state" },
327 { .bus = "ccwgroup", .file = "detach_state" },
328 { .bus = "css", .file = "detach_state" },
329 { .bus = "ccw", .file = "detach_state" },
330 { .bus = "iucv", .file = "detach_state" },
333 const struct device_file *devicefile = NULL;
336 /* the kernel may tell us what to wait for */
337 if (kernel_release_satisfactory(2,6,10) > 0)
338 if (getenv("PHYSDEVBUS") == NULL) {
339 dbg("the kernel says, that there is no bus for '%s'", devices_dev->path);
343 /* wait for the bus device link to the devices device */
344 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
346 if (sysfs_get_device_bus(devices_dev) == 0)
349 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
352 dbg("error: getting bus device link");
354 *error = "no bus device link";
357 dbg("bus device link found for bus '%s'", devices_dev->bus);
359 /* wait for a bus device specific file to show up */
360 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
362 int found_bus_type = 0;
364 for (devicefile = device_files; devicefile->bus != NULL; devicefile++) {
365 if (strcmp(devices_dev->bus, devicefile->bus) == 0) {
366 char filename[SYSFS_PATH_MAX];
369 if (devicefile->file == NULL) {
370 dbg("bus '%s' has no file to wait for", devices_dev->bus);
375 snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", devices_dev->path, devicefile->file);
376 dbg("looking at bus '%s' device for specific file '%s'", devices_dev->bus, filename);
378 if (stat(filename, &stats) == 0) {
379 dbg("bus '%s' device specific file '%s' found", devices_dev->bus, devicefile->file);
384 if (found_bus_type == 0) {
386 *error = "unknown bus";
387 info("error: unknown bus, please report to "
388 "<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
391 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
394 dbg("error: getting '%s' device specific file '%s'", devices_dev->bus, devicefile->file);
396 *error = "bus device specific file unavailable";
401 struct sysfs_class_device *wait_class_device_open(const char *path)
403 struct sysfs_class_device *class_dev = NULL;
406 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
408 class_dev = sysfs_open_class_device_path(path);
412 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
418 int wait_for_class_device(struct sysfs_class_device *class_dev,
421 struct sysfs_class_device *class_dev_parent;
422 struct sysfs_device *devices_dev = NULL;
425 if (wait_for_class_device_attributes(class_dev, error) != 0)
428 /* skip devices without devices-link */
429 if (class_device_expect_no_device_link(class_dev)) {
430 dbg("no device symlink expected for '%s', ", class_dev->name);
434 /* the symlink may be on the parent device */
435 class_dev_parent = sysfs_get_classdev_parent(class_dev);
436 if (class_dev_parent)
437 dbg("looking at parent device for device link '%s'", class_dev_parent->path);
439 /* wait for the symlink to the devices device */
440 dbg("waiting for symlink to devices device");
441 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
443 if (class_dev_parent)
444 devices_dev = sysfs_get_classdev_device(class_dev_parent);
446 devices_dev = sysfs_get_classdev_device(class_dev);
451 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
454 dbg(" error: no devices device symlink found");
456 *error = "no device symlink";
459 dbg("device symlink found pointing to '%s'", devices_dev->path);
461 /* wait for the devices device */
462 if (class_device_expect_no_bus(class_dev)) {
463 dbg("no bus device expected for '%s', ", class_dev->classname);
467 return wait_for_devices_device(devices_dev, error);
470 struct sysfs_device *wait_devices_device_open(const char *path)
472 struct sysfs_device *devices_dev = NULL;
475 loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
477 devices_dev = sysfs_open_device_path(path);
481 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);