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_config_dev(struct config_device *new_dev)
107 struct list_head *tmp;
108 struct config_device *tmp_dev;
110 /* update the values if we already have the device */
111 list_for_each(tmp, &config_device_list) {
112 struct config_device *dev = list_entry(tmp, struct config_device, node);
113 if (strcmp_pattern(new_dev->name, dev->name))
115 if (strncmp(dev->bus, new_dev->bus, sizeof(dev->name)))
117 copy_var(dev, new_dev, type);
118 copy_string(dev, new_dev, bus);
119 copy_string(dev, new_dev, sysfs_file);
120 copy_string(dev, new_dev, sysfs_value);
121 copy_string(dev, new_dev, id);
122 copy_string(dev, new_dev, place);
123 copy_string(dev, new_dev, kernel_name);
124 copy_string(dev, new_dev, exec_program);
125 copy_string(dev, new_dev, symlink);
129 /* not found, add new structure to the device list */
130 tmp_dev = malloc(sizeof(*tmp_dev));
133 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
134 list_add_tail(&tmp_dev->node, &config_device_list);
135 //dump_config_dev(tmp_dev);
139 int add_perm_dev(struct perm_device *new_dev)
141 struct list_head *tmp;
142 struct perm_device *tmp_dev;
144 /* update the values if we already have the device */
145 list_for_each(tmp, &perm_device_list) {
146 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
147 if (strcmp_pattern(new_dev->name, dev->name))
149 copy_var(dev, new_dev, mode);
150 copy_string(dev, new_dev, owner);
151 copy_string(dev, new_dev, group);
155 /* not found, add new structure to the perm list */
156 tmp_dev = malloc(sizeof(*tmp_dev));
159 memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
160 list_add_tail(&tmp_dev->node, &perm_device_list);
161 //dump_perm_dev(tmp_dev);
165 static struct perm_device *find_perm(char *name)
167 struct list_head *tmp;
168 struct perm_device *perm = NULL;
170 list_for_each(tmp, &perm_device_list) {
171 perm = list_entry(tmp, struct perm_device, node);
172 if (strcmp_pattern(perm->name, name))
179 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
181 mode_t mode = 0600; /* default to owner rw only */
183 if (strlen(default_mode_str) != 0) {
184 mode = strtol(default_mode_str, NULL, 8);
189 static void build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
193 dig = class_dev->name + strlen(class_dev->name);
194 while (isdigit(*(dig-1)))
196 strfieldcpy(udev->kernel_number, dig);
197 dbg("kernel_number='%s'", udev->kernel_number);
200 static void apply_format(struct udevice *udev, unsigned char *string)
202 char name[NAME_SIZE];
203 char temp[NAME_SIZE];
212 pos = strchr(string, '%');
217 if (isdigit(tail[0])) {
218 num = (int) strtoul(&pos[1], &tail, 10);
220 dbg("format parsing error '%s'", pos+1);
224 strfieldcpy(name, tail+1);
228 if (strlen(udev->bus_id) == 0)
230 strcat(pos, udev->bus_id);
231 dbg("substitute bus_id '%s'", udev->bus_id);
234 if (strlen(udev->kernel_number) == 0)
236 strcat(pos, udev->kernel_number);
237 dbg("substitute kernel number '%s'", udev->kernel_number);
240 if (strlen(udev->kernel_number) == 0) {
245 strcat(pos, udev->kernel_number);
246 dbg("substitute kernel number '%s'", udev->kernel_number);
249 sprintf(pos, "%u", udev->minor);
250 dbg("substitute minor number '%u'", udev->minor);
253 sprintf(pos, "%u", udev->major);
254 dbg("substitute major number '%u'", udev->major);
257 if (strlen(udev->callout_value) == 0)
260 /* get part of return string */
261 strncpy(temp, udev->callout_value, sizeof(temp));
265 pos3 = strsep(&pos2, " ");
267 dbg("requested part of callout string not found");
272 dbg("substitute partial callout output '%s'", pos3);
274 strcat(pos, udev->callout_value);
275 dbg("substitute callout output '%s'", udev->callout_value);
279 dbg("unknown substitution type '%%%c'", pos[1]);
282 strcat(string, name);
288 static struct bus_file {
292 { .bus = "scsi", .file = "vendor" },
293 { .bus = "usb", .file = "idVendor" },
297 #define SECONDS_TO_WAIT_FOR_FILE 10
298 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
300 /* sleep until we see the file for this specific bus type show up this
301 * is needed because we can easily out-run the kernel in looking for
302 * these files before the paticular subsystem has created them in the
303 * sysfs tree properly.
305 * And people thought that the /sbin/hotplug event system was going to
306 * be slow, poo on you for arguing that before even testing it...
308 struct bus_file *b = &bus_files[0];
309 struct sysfs_attribute *tmpattr;
315 if (strcmp(sysfs_device->bus, b->bus) == 0) {
317 loop = SECONDS_TO_WAIT_FOR_FILE;
319 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
320 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
325 /* sleep to give the kernel a chance to create the file */
328 dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
333 dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
335 return; /* here to prevent compiler warning... */
338 static int exec_callout(struct config_device *dev, char *value, int len)
348 char *args[CALLOUT_MAXARG];
351 dbg("callout to '%s'", dev->exec_program);
365 close(STDOUT_FILENO);
366 dup(fds[1]); /* dup write side of pipe to STDOUT */
367 if (strchr(dev->exec_program, ' ')) {
368 /* callout with arguments */
369 pos = dev->exec_program;
370 for (i=0; i < CALLOUT_MAXARG-1; i++) {
371 args[i] = strsep(&pos, " ");
376 dbg("too many args - %d", i);
379 retval = execve(args[0], args, main_envp);
381 retval = execve(dev->exec_program, main_argv, main_envp);
384 dbg("child execve failed");
387 return -1; /* avoid compiler warning */
389 /* parent reads from fds[0] */
393 res = read(fds[0], buffer, sizeof(buffer) - 1);
398 dbg("callout len %d too short", len);
402 dbg("callout value already set");
406 strncpy(value, buffer, len);
407 pos = value + strlen(value)-1;
410 dbg("callout returned '%s'", value);
416 dbg("wait failed result %d", res);
421 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
422 dbg("callout program status 0x%x", status);
430 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
432 struct config_device *dev;
433 struct list_head *tmp;
435 list_for_each(tmp, &config_device_list) {
436 dev = list_entry(tmp, struct config_device, node);
437 if (dev->type != CALLOUT)
441 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
442 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
446 /* substitute anything that needs to be in the program name */
447 apply_format(udev, dev->exec_program);
448 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
450 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
452 strfieldcpy(udev->name, dev->name);
453 strfieldcpy(udev->symlink, dev->symlink);
454 dbg("callout returned matching value '%s', '%s' becomes '%s'",
455 dev->id, class_dev->name, udev->name);
461 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
463 struct sysfs_attribute *tmpattr = NULL;
464 struct config_device *dev;
465 struct list_head *tmp;
468 list_for_each(tmp, &config_device_list) {
469 dev = list_entry(tmp, struct config_device, node);
470 if (dev->type != LABEL)
474 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
475 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
479 dbg("look for device attribute '%s'", dev->sysfs_file);
480 /* try to find the attribute in the class device directory */
481 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
485 /* look in the class device directory if present */
487 tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
495 c = tmpattr->value + strlen(tmpattr->value)-1;
498 dbg("compare attribute '%s' value '%s' with '%s'",
499 dev->sysfs_file, tmpattr->value, dev->sysfs_value);
500 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
503 strfieldcpy(udev->name, dev->name);
504 strfieldcpy(udev->symlink, dev->symlink);
505 dbg("found matching attribute '%s', '%s' becomes '%s' ",
506 dev->sysfs_file, class_dev->name, udev->name);
513 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
515 struct config_device *dev;
516 struct list_head *tmp;
517 char path[SYSFS_PATH_MAX];
521 /* we have to have a sysfs device for NUMBER to work */
525 list_for_each(tmp, &config_device_list) {
526 dev = list_entry(tmp, struct config_device, node);
527 if (dev->type != NUMBER)
530 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
531 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
535 strfieldcpy(path, sysfs_device->path);
536 temp = strrchr(path, '/');
537 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
538 if (strstr(temp, dev->id) != NULL) {
542 temp = strrchr(path, '/');
543 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
544 if (strstr(temp, dev->id) != NULL)
549 strfieldcpy(udev->name, dev->name);
550 strfieldcpy(udev->symlink, dev->symlink);
551 dbg("found matching id '%s', '%s' becomes '%s'",
552 dev->id, class_dev->name, udev->name);
558 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
560 struct config_device *dev;
561 struct list_head *tmp;
562 char path[SYSFS_PATH_MAX];
566 /* we have to have a sysfs device for TOPOLOGY to work */
570 list_for_each(tmp, &config_device_list) {
571 dev = list_entry(tmp, struct config_device, node);
572 if (dev->type != TOPOLOGY)
575 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
576 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
580 strfieldcpy(path, sysfs_device->path);
581 temp = strrchr(path, '/');
582 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
583 if (strstr(temp, dev->place) != NULL) {
587 temp = strrchr(path, '/');
588 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
589 if (strstr(temp, dev->place) != NULL)
595 strfieldcpy(udev->name, dev->name);
596 strfieldcpy(udev->symlink, dev->symlink);
597 dbg("found matching place '%s', '%s' becomes '%s'",
598 dev->place, class_dev->name, udev->name);
604 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
606 struct config_device *dev;
607 struct list_head *tmp;
609 list_for_each(tmp, &config_device_list) {
610 dev = list_entry(tmp, struct config_device, node);
611 if (dev->type != REPLACE)
614 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
615 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
618 strfieldcpy(udev->name, dev->name);
619 strfieldcpy(udev->symlink, dev->symlink);
620 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
627 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
629 /* heh, this is pretty simple... */
630 strfieldcpy(udev->name, class_dev->name);
633 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
635 struct sysfs_device *sysfs_device;
636 struct sysfs_class_device *class_dev_parent;
640 /* This is needed here as we can easily out-race the placement of the
641 * device symlink by the kernel. The call to sleep(1); will be removed
642 * once libsysfs can be queried for sysfs_get_classdev_device()
643 * multiple times and have it return the proper information when the
644 * class device really shows up. For now, we live with the time
650 Something like this could also work, but for some reason doesn't,
651 I also tried just stat() on the device symlink, but that still
652 has nasty races, I'm probably doing something stupid... :( */
657 char filename[SYSFS_PATH_MAX + 6];
659 strcpy(filename, class_dev->path);
660 strcat(filename, "/device");
661 dbg("looking for '%s'", filename);
662 retval = stat(filename, &buf);
666 /* bah, let's go backwards up a level to see if the device is there,
667 * as block partitions don't point to the physical device. Need to fix that
668 * up in the kernel...
670 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
671 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
672 class_dev_parent = sysfs_get_classdev_parent(class_dev);
673 if (class_dev_parent == NULL) {
674 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
676 strcpy(filename, class_dev_parent->path);
677 strcat(filename, "/device");
678 dbg("looking for '%s'", filename);
679 retval = stat(filename, &buf);
685 /* sleep to give the kernel a chance to create the device file */
689 loop = 1; /* FIXME put a real value in here for when everything is fixed... */
691 /* find the sysfs_device for this class device */
692 /* Wouldn't it really be nice if libsysfs could do this for us? */
693 sysfs_device = sysfs_get_classdev_device(class_dev);
694 if (sysfs_device != NULL)
697 /* bah, let's go backwards up a level to see if the device is there,
698 * as block partitions don't point to the physical device. Need to fix that
699 * up in the kernel...
701 if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
702 dbg("looking at block device");
703 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
704 dbg("really is a partition");
705 class_dev_parent = sysfs_get_classdev_parent(class_dev);
706 if (class_dev_parent == NULL) {
707 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
709 dbg("class_dev_parent->name='%s'", class_dev_parent->name);
710 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
711 if (sysfs_device != NULL)
716 /* sleep to give the kernel a chance to create the link */
720 dbg("Timed out waiting for device symlink, continuing on anyway...");
725 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
727 struct sysfs_device *sysfs_device = NULL;
728 struct sysfs_class_device *class_dev_parent = NULL;
730 struct perm_device *perm;
734 /* find the sysfs_device associated with this class device */
735 sysfs_device = get_sysfs_device(class_dev);
737 dbg("sysfs_device->path='%s'", sysfs_device->path);
738 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
739 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
740 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
741 wait_for_device_to_initialize(sysfs_device);
743 dbg("class_dev->name = '%s'", class_dev->name);
746 build_kernel_number(class_dev, udev);
748 /* rules are looked at in priority order */
749 retval = do_callout(class_dev, udev, sysfs_device);
753 retval = do_label(class_dev, udev, sysfs_device);
757 retval = do_number(class_dev, udev, sysfs_device);
761 retval = do_topology(class_dev, udev, sysfs_device);
765 retval = do_replace(class_dev, udev, sysfs_device);
769 do_kernelname(class_dev, udev);
773 /* substitute placeholder */
774 apply_format(udev, udev->name);
775 apply_format(udev, udev->symlink);
778 perm = find_perm(udev->name);
780 udev->mode = perm->mode;
781 strfieldcpy(udev->owner, perm->owner);
782 strfieldcpy(udev->group, perm->group);
784 /* no matching perms found :( */
785 udev->mode = get_default_mode(class_dev);
786 udev->owner[0] = 0x00;
787 udev->group[0] = 0x00;
789 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
790 udev->name, udev->owner, udev->group, udev->mode);
795 int namedev_init(void)
799 retval = namedev_init_rules();
803 retval = namedev_init_permissions();
807 dump_config_dev_list();
808 dump_perm_dev_list();