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.
37 #include "udev_version.h"
39 #include "libsysfs/libsysfs.h"
40 #include "klibc_fixups.h"
42 LIST_HEAD(config_device_list);
43 LIST_HEAD(perm_device_list);
45 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
46 static int strcmp_pattern(const char *p, const char *s)
62 while (*p && (*p != ']')) {
65 if ((*s >= *p) && (*s <= p[2]))
73 while (*p && (*p != ']'))
75 return strcmp_pattern(p+1, s+1);
81 if (strcmp_pattern(p, s+1))
82 return strcmp_pattern(p+1, s);
90 if ((*p == *s) || (*p == '?'))
91 return strcmp_pattern(p+1, s+1);
97 #define copy_var(a, b, var) \
101 #define copy_string(a, b, var) \
102 if (strlen(b->var)) \
103 strcpy(a->var, b->var);
105 int add_perm_dev(struct perm_device *new_dev)
107 struct list_head *tmp;
108 struct perm_device *tmp_dev;
110 /* update the values if we already have the device */
111 list_for_each(tmp, &perm_device_list) {
112 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
113 if (strcmp_pattern(new_dev->name, dev->name))
115 copy_var(dev, new_dev, mode);
116 copy_string(dev, new_dev, owner);
117 copy_string(dev, new_dev, group);
121 /* not found, add new structure to the perm list */
122 tmp_dev = malloc(sizeof(*tmp_dev));
125 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
126 list_add_tail(&tmp_dev->node, &perm_device_list);
127 //dump_perm_dev(tmp_dev);
131 static struct perm_device *find_perm(char *name)
133 struct list_head *tmp;
134 struct perm_device *perm = NULL;
136 list_for_each(tmp, &perm_device_list) {
137 perm = list_entry(tmp, struct perm_device, node);
138 if (strcmp_pattern(perm->name, name))
145 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
147 mode_t mode = 0600; /* default to owner rw only */
149 if (strlen(default_mode_str) != 0) {
150 mode = strtol(default_mode_str, NULL, 8);
155 static void apply_format(struct udevice *udev, unsigned char *string)
157 char name[NAME_SIZE];
158 char temp[NAME_SIZE];
167 pos = strchr(string, '%');
172 if (isdigit(tail[0])) {
173 num = (int) strtoul(&pos[1], &tail, 10);
175 dbg("format parsing error '%s'", pos+1);
179 strfieldcpy(name, tail+1);
183 if (strlen(udev->bus_id) == 0)
185 strcat(pos, udev->bus_id);
186 dbg("substitute bus_id '%s'", udev->bus_id);
189 if (strlen(udev->kernel_name) == 0)
191 strcat(pos, udev->kernel_name);
192 dbg("substitute kernel name '%s'", udev->kernel_name);
195 if (strlen(udev->kernel_number) == 0)
197 strcat(pos, udev->kernel_number);
198 dbg("substitute kernel number '%s'", udev->kernel_number);
201 if (strlen(udev->kernel_number) == 0) {
206 strcat(pos, udev->kernel_number);
207 dbg("substitute kernel number '%s'", udev->kernel_number);
210 sprintf(pos, "%u", udev->minor);
211 dbg("substitute minor number '%u'", udev->minor);
214 sprintf(pos, "%u", udev->major);
215 dbg("substitute major number '%u'", udev->major);
218 if (strlen(udev->callout_value) == 0)
221 /* get part of return string */
222 strncpy(temp, udev->callout_value, sizeof(temp));
226 pos3 = strsep(&pos2, " ");
228 dbg("requested part of callout string not found");
233 dbg("substitute partial callout output '%s'", pos3);
235 strcat(pos, udev->callout_value);
236 dbg("substitute callout output '%s'", udev->callout_value);
240 dbg("unknown substitution type '%%%c'", pos[1]);
243 strcat(string, name);
249 static struct bus_file {
253 { .bus = "scsi", .file = "vendor" },
254 { .bus = "usb", .file = "idVendor" },
258 #define SECONDS_TO_WAIT_FOR_FILE 10
259 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
261 /* sleep until we see the file for this specific bus type show up this
262 * is needed because we can easily out-run the kernel in looking for
263 * these files before the paticular subsystem has created them in the
264 * sysfs tree properly.
266 * And people thought that the /sbin/hotplug event system was going to
267 * be slow, poo on you for arguing that before even testing it...
269 struct bus_file *b = &bus_files[0];
270 struct sysfs_attribute *tmpattr;
276 if (strcmp(sysfs_device->bus, b->bus) == 0) {
278 loop = SECONDS_TO_WAIT_FOR_FILE;
280 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
281 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
286 /* sleep to give the kernel a chance to create the file */
289 dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
294 dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
296 return; /* here to prevent compiler warning... */
299 static int exec_callout(struct config_device *dev, char *value, int len)
309 char *args[CALLOUT_MAXARG];
312 dbg("callout to '%s'", dev->exec_program);
326 close(STDOUT_FILENO);
327 dup(fds[1]); /* dup write side of pipe to STDOUT */
328 if (strchr(dev->exec_program, ' ')) {
329 /* callout with arguments */
330 pos = dev->exec_program;
331 for (i=0; i < CALLOUT_MAXARG-1; i++) {
332 args[i] = strsep(&pos, " ");
337 dbg("too many args - %d", i);
340 retval = execve(args[0], args, main_envp);
342 retval = execve(dev->exec_program, main_argv, main_envp);
345 dbg("child execve failed");
348 return -1; /* avoid compiler warning */
350 /* parent reads from fds[0] */
354 res = read(fds[0], buffer, sizeof(buffer) - 1);
359 dbg("callout len %d too short", len);
363 dbg("callout value already set");
367 strncpy(value, buffer, len);
368 pos = value + strlen(value)-1;
371 dbg("callout returned '%s'", value);
377 dbg("wait failed result %d", res);
382 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
383 dbg("callout program status 0x%x", status);
391 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
393 struct config_device *dev;
394 struct list_head *tmp;
396 list_for_each(tmp, &config_device_list) {
397 dev = list_entry(tmp, struct config_device, node);
398 if (dev->type != CALLOUT)
402 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
403 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
407 /* substitute anything that needs to be in the program name */
408 apply_format(udev, dev->exec_program);
409 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
411 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
413 strfieldcpy(udev->name, dev->name);
414 strfieldcpy(udev->symlink, dev->symlink);
415 dbg("callout returned matching value '%s', '%s' becomes '%s'",
416 dev->id, class_dev->name, udev->name);
422 static int match_pair(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
424 struct sysfs_attribute *tmpattr = NULL;
427 if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
430 dbg("look for device attribute '%s'", pair->file);
431 /* try to find the attribute in the class device directory */
432 tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
436 /* look in the class device directory if present */
438 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
446 c = tmpattr->value + strlen(tmpattr->value)-1;
449 dbg("compare attribute '%s' value '%s' with '%s'",
450 pair->file, tmpattr->value, pair->value);
451 if (strcmp_pattern(pair->value, tmpattr->value) != 0)
454 dbg("found matching attribute '%s' with value '%s'",
455 pair->file, pair->value);
459 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
461 struct sysfs_pair *pair;
462 struct config_device *dev;
463 struct list_head *tmp;
467 list_for_each(tmp, &config_device_list) {
468 dev = list_entry(tmp, struct config_device, node);
469 if (dev->type != LABEL)
473 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
474 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
479 for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
480 pair = &dev->sysfs_pair[i];
481 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
483 if (match_pair(class_dev, sysfs_device, pair) != 0) {
492 strfieldcpy(udev->name, dev->name);
493 strfieldcpy(udev->symlink, dev->symlink);
494 dbg("found matching attribute, '%s' becomes '%s' ",
495 class_dev->name, udev->name);
502 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
504 struct config_device *dev;
505 struct list_head *tmp;
506 char path[SYSFS_PATH_MAX];
510 /* we have to have a sysfs device for NUMBER to work */
514 list_for_each(tmp, &config_device_list) {
515 dev = list_entry(tmp, struct config_device, node);
516 if (dev->type != NUMBER)
519 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
520 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
524 strfieldcpy(path, sysfs_device->path);
525 temp = strrchr(path, '/');
526 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
527 if (strstr(temp, dev->id) != NULL) {
531 temp = strrchr(path, '/');
532 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
533 if (strstr(temp, dev->id) != NULL)
538 strfieldcpy(udev->name, dev->name);
539 strfieldcpy(udev->symlink, dev->symlink);
540 dbg("found matching id '%s', '%s' becomes '%s'",
541 dev->id, class_dev->name, udev->name);
547 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
549 struct config_device *dev;
550 struct list_head *tmp;
551 char path[SYSFS_PATH_MAX];
555 /* we have to have a sysfs device for TOPOLOGY to work */
559 list_for_each(tmp, &config_device_list) {
560 dev = list_entry(tmp, struct config_device, node);
561 if (dev->type != TOPOLOGY)
564 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
565 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
569 strfieldcpy(path, sysfs_device->path);
570 temp = strrchr(path, '/');
571 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
572 if (strstr(temp, dev->place) != NULL) {
576 temp = strrchr(path, '/');
577 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
578 if (strstr(temp, dev->place) != NULL)
584 strfieldcpy(udev->name, dev->name);
585 strfieldcpy(udev->symlink, dev->symlink);
586 dbg("found matching place '%s', '%s' becomes '%s'",
587 dev->place, class_dev->name, udev->name);
593 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
595 struct config_device *dev;
596 struct list_head *tmp;
598 list_for_each(tmp, &config_device_list) {
599 dev = list_entry(tmp, struct config_device, node);
600 if (dev->type != REPLACE)
603 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
604 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
607 strfieldcpy(udev->name, dev->name);
608 strfieldcpy(udev->symlink, dev->symlink);
609 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
616 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
618 /* heh, this is pretty simple... */
619 strfieldcpy(udev->name, class_dev->name);
622 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
624 struct sysfs_device *sysfs_device;
625 struct sysfs_class_device *class_dev_parent;
629 /* This is needed here as we can easily out-race the placement of the
630 * device symlink by the kernel. The call to sleep(1); will be removed
631 * once libsysfs can be queried for sysfs_get_classdev_device()
632 * multiple times and have it return the proper information when the
633 * class device really shows up. For now, we live with the time
639 Something like this could also work, but for some reason doesn't,
640 I also tried just stat() on the device symlink, but that still
641 has nasty races, I'm probably doing something stupid... :( */
646 char filename[SYSFS_PATH_MAX + 6];
648 strcpy(filename, class_dev->path);
649 strcat(filename, "/device");
650 dbg("looking for '%s'", filename);
651 retval = stat(filename, &buf);
655 /* bah, let's go backwards up a level to see if the device is there,
656 * as block partitions don't point to the physical device. Need to fix that
657 * up in the kernel...
659 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
660 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
661 class_dev_parent = sysfs_get_classdev_parent(class_dev);
662 if (class_dev_parent == NULL) {
663 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
665 strcpy(filename, class_dev_parent->path);
666 strcat(filename, "/device");
667 dbg("looking for '%s'", filename);
668 retval = stat(filename, &buf);
674 /* sleep to give the kernel a chance to create the device file */
678 loop = 1; /* FIXME put a real value in here for when everything is fixed... */
680 /* find the sysfs_device for this class device */
681 /* Wouldn't it really be nice if libsysfs could do this for us? */
682 sysfs_device = sysfs_get_classdev_device(class_dev);
683 if (sysfs_device != NULL)
686 /* bah, let's go backwards up a level to see if the device is there,
687 * as block partitions don't point to the physical device. Need to fix that
688 * up in the kernel...
690 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
691 dbg("looking at block device");
692 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
693 dbg("really is a partition");
694 class_dev_parent = sysfs_get_classdev_parent(class_dev);
695 if (class_dev_parent == NULL) {
696 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
698 dbg("class_dev_parent->name='%s'", class_dev_parent->name);
699 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
700 if (sysfs_device != NULL)
705 /* sleep to give the kernel a chance to create the link */
709 dbg("Timed out waiting for device symlink, continuing on anyway...");
714 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
716 struct sysfs_device *sysfs_device = NULL;
718 struct perm_device *perm;
723 /* find the sysfs_device associated with this class device */
724 sysfs_device = get_sysfs_device(class_dev);
726 dbg("sysfs_device->path='%s'", sysfs_device->path);
727 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
728 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
729 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
730 wait_for_device_to_initialize(sysfs_device);
732 dbg("class_dev->name = '%s'", class_dev->name);
735 strfieldcpy(udev->kernel_name, class_dev->name);
737 /* get kernel number */
738 pos = class_dev->name + strlen(class_dev->name);
739 while (isdigit(*(pos-1)))
741 strfieldcpy(udev->kernel_number, pos);
742 dbg("kernel_number='%s'", udev->kernel_number);
744 /* rules are looked at in priority order */
745 retval = do_callout(class_dev, udev, sysfs_device);
749 retval = do_label(class_dev, udev, sysfs_device);
753 retval = do_number(class_dev, udev, sysfs_device);
757 retval = do_topology(class_dev, udev, sysfs_device);
761 retval = do_replace(class_dev, udev, sysfs_device);
765 do_kernelname(class_dev, udev);
769 /* substitute placeholder */
770 apply_format(udev, udev->name);
771 apply_format(udev, udev->symlink);
774 perm = find_perm(udev->name);
776 udev->mode = perm->mode;
777 strfieldcpy(udev->owner, perm->owner);
778 strfieldcpy(udev->group, perm->group);
780 /* no matching perms found :( */
781 udev->mode = get_default_mode(class_dev);
782 udev->owner[0] = 0x00;
783 udev->group[0] = 0x00;
785 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
786 udev->name, udev->owner, udev->group, udev->mode);
791 int namedev_init(void)
795 retval = namedev_init_rules();
799 retval = namedev_init_permissions();
803 dump_config_dev_list();
804 dump_perm_dev_list();