4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/delay.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/list.h>
27 #include <linux/interrupt.h>
28 #include <linux/spinlock.h>
29 #include <linux/timer.h>
30 #include <linux/device.h>
31 #include <linux/slab.h>
32 #include <linux/sched.h>
33 #include <linux/kthread.h>
34 #include <linux/freezer.h>
36 #include <asm/atomic.h>
41 #include "w1_family.h"
42 #include "w1_netlink.h"
44 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
46 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
48 static int w1_timeout = 10;
49 int w1_max_slave_count = 10;
50 int w1_max_slave_ttl = 10;
52 module_param_named(timeout, w1_timeout, int, 0);
53 module_param_named(max_slave_count, w1_max_slave_count, int, 0);
54 module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
56 DEFINE_MUTEX(w1_mlock);
57 LIST_HEAD(w1_masters);
59 static int w1_master_match(struct device *dev, struct device_driver *drv)
64 static int w1_master_probe(struct device *dev)
69 static void w1_master_release(struct device *dev)
71 struct w1_master *md = dev_to_w1_master(dev);
73 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
74 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
78 static void w1_slave_release(struct device *dev)
80 struct w1_slave *sl = dev_to_w1_slave(dev);
82 printk("%s: Releasing %s.\n", __func__, sl->name);
84 while (atomic_read(&sl->refcnt)) {
85 printk("Waiting for %s to become free: refcnt=%d.\n",
86 sl->name, atomic_read(&sl->refcnt));
87 if (msleep_interruptible(1000))
88 flush_signals(current);
91 w1_family_put(sl->family);
92 sl->master->slave_count--;
94 complete(&sl->released);
97 static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
99 struct w1_slave *sl = dev_to_w1_slave(dev);
101 return sprintf(buf, "%s\n", sl->name);
104 static ssize_t w1_slave_read_id(struct kobject *kobj,
105 struct bin_attribute *bin_attr,
106 char *buf, loff_t off, size_t count)
108 struct w1_slave *sl = kobj_to_w1_slave(kobj);
116 memcpy(buf, (u8 *)&sl->reg_num, count);
122 static struct device_attribute w1_slave_attr_name =
123 __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
125 static struct bin_attribute w1_slave_attr_bin_id = {
131 .read = w1_slave_read_id,
136 static ssize_t w1_default_write(struct kobject *kobj,
137 struct bin_attribute *bin_attr,
138 char *buf, loff_t off, size_t count)
140 struct w1_slave *sl = kobj_to_w1_slave(kobj);
142 mutex_lock(&sl->master->mutex);
143 if (w1_reset_select_slave(sl)) {
148 w1_write_block(sl->master, buf, count);
151 mutex_unlock(&sl->master->mutex);
155 static ssize_t w1_default_read(struct kobject *kobj,
156 struct bin_attribute *bin_attr,
157 char *buf, loff_t off, size_t count)
159 struct w1_slave *sl = kobj_to_w1_slave(kobj);
161 mutex_lock(&sl->master->mutex);
162 w1_read_block(sl->master, buf, count);
163 mutex_unlock(&sl->master->mutex);
167 static struct bin_attribute w1_default_attr = {
170 .mode = S_IRUGO | S_IWUSR,
173 .read = w1_default_read,
174 .write = w1_default_write,
177 static int w1_default_add_slave(struct w1_slave *sl)
179 return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
182 static void w1_default_remove_slave(struct w1_slave *sl)
184 sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
187 static struct w1_family_ops w1_default_fops = {
188 .add_slave = w1_default_add_slave,
189 .remove_slave = w1_default_remove_slave,
192 static struct w1_family w1_default_family = {
193 .fops = &w1_default_fops,
196 static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
198 static struct bus_type w1_bus_type = {
200 .match = w1_master_match,
204 struct device_driver w1_master_driver = {
205 .name = "w1_master_driver",
207 .probe = w1_master_probe,
210 struct device w1_master_device = {
213 .bus_id = "w1 bus master",
214 .driver = &w1_master_driver,
215 .release = &w1_master_release
218 static struct device_driver w1_slave_driver = {
219 .name = "w1_slave_driver",
224 struct device w1_slave_device = {
227 .bus_id = "w1 bus slave",
228 .driver = &w1_slave_driver,
229 .release = &w1_slave_release
233 static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
235 struct w1_master *md = dev_to_w1_master(dev);
238 mutex_lock(&md->mutex);
239 count = sprintf(buf, "%s\n", md->name);
240 mutex_unlock(&md->mutex);
245 static ssize_t w1_master_attribute_store_search(struct device * dev,
246 struct device_attribute *attr,
247 const char * buf, size_t count)
250 struct w1_master *md = dev_to_w1_master(dev);
252 if (strict_strtol(buf, 0, &tmp) == -EINVAL)
255 mutex_lock(&md->mutex);
256 md->search_count = tmp;
257 mutex_unlock(&md->mutex);
258 wake_up_process(md->thread);
263 static ssize_t w1_master_attribute_show_search(struct device *dev,
264 struct device_attribute *attr,
267 struct w1_master *md = dev_to_w1_master(dev);
270 mutex_lock(&md->mutex);
271 count = sprintf(buf, "%d\n", md->search_count);
272 mutex_unlock(&md->mutex);
277 static ssize_t w1_master_attribute_store_pullup(struct device *dev,
278 struct device_attribute *attr,
279 const char *buf, size_t count)
282 struct w1_master *md = dev_to_w1_master(dev);
284 if (strict_strtol(buf, 0, &tmp) == -EINVAL)
287 mutex_lock(&md->mutex);
288 md->enable_pullup = tmp;
289 mutex_unlock(&md->mutex);
290 wake_up_process(md->thread);
295 static ssize_t w1_master_attribute_show_pullup(struct device *dev,
296 struct device_attribute *attr,
299 struct w1_master *md = dev_to_w1_master(dev);
302 mutex_lock(&md->mutex);
303 count = sprintf(buf, "%d\n", md->enable_pullup);
304 mutex_unlock(&md->mutex);
309 static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
311 struct w1_master *md = dev_to_w1_master(dev);
314 mutex_lock(&md->mutex);
315 count = sprintf(buf, "0x%p\n", md->bus_master);
316 mutex_unlock(&md->mutex);
320 static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
323 count = sprintf(buf, "%d\n", w1_timeout);
327 static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
329 struct w1_master *md = dev_to_w1_master(dev);
332 mutex_lock(&md->mutex);
333 count = sprintf(buf, "%d\n", md->max_slave_count);
334 mutex_unlock(&md->mutex);
338 static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
340 struct w1_master *md = dev_to_w1_master(dev);
343 mutex_lock(&md->mutex);
344 count = sprintf(buf, "%lu\n", md->attempts);
345 mutex_unlock(&md->mutex);
349 static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
351 struct w1_master *md = dev_to_w1_master(dev);
354 mutex_lock(&md->mutex);
355 count = sprintf(buf, "%d\n", md->slave_count);
356 mutex_unlock(&md->mutex);
360 static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
362 struct w1_master *md = dev_to_w1_master(dev);
365 mutex_lock(&md->mutex);
367 if (md->slave_count == 0)
368 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
370 struct list_head *ent, *n;
373 list_for_each_safe(ent, n, &md->slist) {
374 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
376 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
380 mutex_unlock(&md->mutex);
382 return PAGE_SIZE - c;
385 #define W1_MASTER_ATTR_RO(_name, _mode) \
386 struct device_attribute w1_master_attribute_##_name = \
387 __ATTR(w1_master_##_name, _mode, \
388 w1_master_attribute_show_##_name, NULL)
390 #define W1_MASTER_ATTR_RW(_name, _mode) \
391 struct device_attribute w1_master_attribute_##_name = \
392 __ATTR(w1_master_##_name, _mode, \
393 w1_master_attribute_show_##_name, \
394 w1_master_attribute_store_##_name)
396 static W1_MASTER_ATTR_RO(name, S_IRUGO);
397 static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
398 static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
399 static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
400 static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
401 static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
402 static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
403 static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
404 static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO);
406 static struct attribute *w1_master_default_attrs[] = {
407 &w1_master_attribute_name.attr,
408 &w1_master_attribute_slaves.attr,
409 &w1_master_attribute_slave_count.attr,
410 &w1_master_attribute_max_slave_count.attr,
411 &w1_master_attribute_attempts.attr,
412 &w1_master_attribute_timeout.attr,
413 &w1_master_attribute_pointer.attr,
414 &w1_master_attribute_search.attr,
415 &w1_master_attribute_pullup.attr,
419 static struct attribute_group w1_master_defattr_group = {
420 .attrs = w1_master_default_attrs,
423 int w1_create_master_attributes(struct w1_master *master)
425 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
428 void w1_destroy_master_attributes(struct w1_master *master)
430 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
433 #ifdef CONFIG_HOTPLUG
434 static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
436 struct w1_master *md = NULL;
437 struct w1_slave *sl = NULL;
438 char *event_owner, *name;
441 if (dev->driver == &w1_master_driver) {
442 md = container_of(dev, struct w1_master, dev);
443 event_owner = "master";
445 } else if (dev->driver == &w1_slave_driver) {
446 sl = container_of(dev, struct w1_slave, dev);
447 event_owner = "slave";
450 dev_dbg(dev, "Unknown event.\n");
454 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
455 event_owner, name, dev->bus_id);
457 if (dev->driver != &w1_slave_driver || !sl)
460 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
464 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
465 (unsigned long long)sl->reg_num.id);
472 static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
478 static int __w1_attach_slave_device(struct w1_slave *sl)
482 sl->dev.parent = &sl->master->dev;
483 sl->dev.driver = &w1_slave_driver;
484 sl->dev.bus = &w1_bus_type;
485 sl->dev.release = &w1_slave_release;
487 snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
489 (unsigned int) sl->reg_num.family,
490 (unsigned long long) sl->reg_num.id);
491 snprintf(&sl->name[0], sizeof(sl->name),
493 (unsigned int) sl->reg_num.family,
494 (unsigned long long) sl->reg_num.id);
496 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
497 &sl->dev.bus_id[0], sl);
499 err = device_register(&sl->dev);
502 "Device registration [%s] failed. err=%d\n",
503 sl->dev.bus_id, err);
507 /* Create "name" entry */
508 err = device_create_file(&sl->dev, &w1_slave_attr_name);
511 "sysfs file creation for [%s] failed. err=%d\n",
512 sl->dev.bus_id, err);
516 /* Create "id" entry */
517 err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
520 "sysfs file creation for [%s] failed. err=%d\n",
521 sl->dev.bus_id, err);
525 /* if the family driver needs to initialize something... */
526 if (sl->family->fops && sl->family->fops->add_slave &&
527 ((err = sl->family->fops->add_slave(sl)) < 0)) {
529 "sysfs file creation for [%s] failed. err=%d\n",
530 sl->dev.bus_id, err);
534 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
539 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
541 device_remove_file(&sl->dev, &w1_slave_attr_name);
543 device_unregister(&sl->dev);
547 static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
552 struct w1_netlink_msg msg;
554 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
557 "%s: failed to allocate new slave device.\n",
563 sl->owner = THIS_MODULE;
565 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
567 memset(&msg, 0, sizeof(msg));
568 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
569 atomic_set(&sl->refcnt, 0);
570 init_completion(&sl->released);
572 spin_lock(&w1_flock);
573 f = w1_family_registered(rn->family);
575 f= &w1_default_family;
576 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
577 rn->family, rn->family,
578 (unsigned long long)rn->id, rn->crc);
581 spin_unlock(&w1_flock);
586 err = __w1_attach_slave_device(sl);
588 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
590 w1_family_put(sl->family);
595 sl->ttl = dev->slave_ttl;
598 memcpy(msg.id.id, rn, sizeof(msg.id));
599 msg.type = W1_SLAVE_ADD;
600 w1_netlink_send(dev, &msg);
605 void w1_slave_detach(struct w1_slave *sl)
607 struct w1_netlink_msg msg;
609 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
611 list_del(&sl->w1_slave_entry);
613 if (sl->family->fops && sl->family->fops->remove_slave)
614 sl->family->fops->remove_slave(sl);
616 memset(&msg, 0, sizeof(msg));
617 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
618 msg.type = W1_SLAVE_REMOVE;
619 w1_netlink_send(sl->master, &msg);
621 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
622 device_remove_file(&sl->dev, &w1_slave_attr_name);
623 device_unregister(&sl->dev);
625 wait_for_completion(&sl->released);
629 struct w1_master *w1_search_master_id(u32 id)
631 struct w1_master *dev;
634 mutex_lock(&w1_mlock);
635 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
638 atomic_inc(&dev->refcnt);
642 mutex_unlock(&w1_mlock);
644 return (found)?dev:NULL;
647 struct w1_slave *w1_search_slave(struct w1_reg_num *id)
649 struct w1_master *dev;
650 struct w1_slave *sl = NULL;
653 mutex_lock(&w1_mlock);
654 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
655 mutex_lock(&dev->mutex);
656 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
657 if (sl->reg_num.family == id->family &&
658 sl->reg_num.id == id->id &&
659 sl->reg_num.crc == id->crc) {
661 atomic_inc(&dev->refcnt);
662 atomic_inc(&sl->refcnt);
666 mutex_unlock(&dev->mutex);
671 mutex_unlock(&w1_mlock);
673 return (found)?sl:NULL;
676 void w1_reconnect_slaves(struct w1_family *f, int attach)
678 struct w1_slave *sl, *sln;
679 struct w1_master *dev;
681 mutex_lock(&w1_mlock);
682 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
683 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
684 "for family %02x.\n", dev->name, f->fid);
685 mutex_lock(&dev->mutex);
686 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
687 /* If it is a new family, slaves with the default
688 * family driver and are that family will be
689 * connected. If the family is going away, devices
690 * matching that family are reconneced.
692 if ((attach && sl->family->fid == W1_FAMILY_DEFAULT
693 && sl->reg_num.family == f->fid) ||
694 (!attach && sl->family->fid == f->fid)) {
695 struct w1_reg_num rn;
697 memcpy(&rn, &sl->reg_num, sizeof(rn));
700 w1_attach_slave_device(dev, &rn);
703 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
704 "has been finished.\n", dev->name);
705 mutex_unlock(&dev->mutex);
707 mutex_unlock(&w1_mlock);
710 static void w1_slave_found(struct w1_master *dev, u64 rn)
714 struct list_head *ent;
715 struct w1_reg_num *tmp;
716 u64 rn_le = cpu_to_le64(rn);
718 atomic_inc(&dev->refcnt);
720 tmp = (struct w1_reg_num *) &rn;
723 list_for_each(ent, &dev->slist) {
725 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
727 if (sl->reg_num.family == tmp->family &&
728 sl->reg_num.id == tmp->id &&
729 sl->reg_num.crc == tmp->crc) {
730 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
737 if (slave_count == dev->slave_count &&
738 rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
739 w1_attach_slave_device(dev, tmp);
742 atomic_dec(&dev->refcnt);
746 * Performs a ROM Search & registers any devices found.
747 * The 1-wire search is a simple binary tree search.
748 * For each bit of the address, we read two bits and write one bit.
749 * The bit written will put to sleep all devies that don't match that bit.
750 * When the two reads differ, the direction choice is obvious.
751 * When both bits are 0, we must choose a path to take.
752 * When we can scan all 64 bits without having to choose a path, we are done.
754 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
756 * @dev The master device to search
757 * @cb Function to call when a device is found
759 void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
761 u64 last_rn, rn, tmp64;
762 int i, slave_count = 0;
763 int last_zero, last_device;
764 int search_bit, desc_bit;
774 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
779 * Reset bus and all 1-wire device state machines
780 * so they can respond to our requests.
782 * Return 0 - device(s) present, 1 - no devices present.
784 if (w1_reset_bus(dev)) {
785 dev_dbg(&dev->dev, "No devices present on the wire.\n");
789 /* Start the search */
790 w1_write_8(dev, search_type);
791 for (i = 0; i < 64; ++i) {
792 /* Determine the direction/search bit */
794 search_bit = 1; /* took the 0 path last time, so take the 1 path */
795 else if (i > desc_bit)
796 search_bit = 0; /* take the 0 path on the next branch */
798 search_bit = ((last_rn >> i) & 0x1);
800 /** Read two bits and write one bit */
801 triplet_ret = w1_triplet(dev, search_bit);
803 /* quit if no device responded */
804 if ( (triplet_ret & 0x03) == 0x03 )
807 /* If both directions were valid, and we took the 0 path... */
808 if (triplet_ret == 0)
811 /* extract the direction taken & update the device number */
812 tmp64 = (triplet_ret >> 2);
815 if (kthread_should_stop()) {
816 printk(KERN_INFO "Abort w1_search (exiting)\n");
821 if ( (triplet_ret & 0x03) != 0x03 ) {
822 if ( (desc_bit == last_zero) || (last_zero < 0))
824 desc_bit = last_zero;
830 void w1_search_process(struct w1_master *dev, u8 search_type)
832 struct w1_slave *sl, *sln;
834 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
835 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
837 w1_search_devices(dev, search_type, w1_slave_found);
839 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
840 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
842 else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
843 sl->ttl = dev->slave_ttl;
846 if (dev->search_count > 0)
850 int w1_process(void *data)
852 struct w1_master *dev = (struct w1_master *) data;
853 /* As long as w1_timeout is only set by a module parameter the sleep
854 * time can be calculated in jiffies once.
856 const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
858 while (!kthread_should_stop()) {
859 if (dev->search_count) {
860 mutex_lock(&dev->mutex);
861 w1_search_process(dev, W1_SEARCH);
862 mutex_unlock(&dev->mutex);
866 __set_current_state(TASK_INTERRUPTIBLE);
868 if (kthread_should_stop())
871 /* Only sleep when the search is active. */
872 if (dev->search_count)
873 schedule_timeout(jtime);
878 atomic_dec(&dev->refcnt);
883 static int w1_init(void)
887 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
891 retval = bus_register(&w1_bus_type);
893 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
894 goto err_out_exit_init;
897 retval = driver_register(&w1_master_driver);
900 "Failed to register master driver. err=%d.\n",
902 goto err_out_bus_unregister;
905 retval = driver_register(&w1_slave_driver);
908 "Failed to register master driver. err=%d.\n",
910 goto err_out_master_unregister;
916 /* For undoing the slave register if there was a step after it. */
917 err_out_slave_unregister:
918 driver_unregister(&w1_slave_driver);
921 err_out_master_unregister:
922 driver_unregister(&w1_master_driver);
924 err_out_bus_unregister:
925 bus_unregister(&w1_bus_type);
931 static void w1_fini(void)
933 struct w1_master *dev;
935 /* Set netlink removal messages and some cleanup */
936 list_for_each_entry(dev, &w1_masters, w1_master_entry)
937 __w1_remove_master_device(dev);
941 driver_unregister(&w1_slave_driver);
942 driver_unregister(&w1_master_driver);
943 bus_unregister(&w1_bus_type);
946 module_init(w1_init);
947 module_exit(w1_fini);