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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Evgeniy Polyakov77859252005-05-20 22:33:25 +04002 * w1.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Evgeniy Polyakov77859252005-05-20 22:33:25 +04005 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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.
11 *
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.
16 *
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
20 */
21
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
34#include <asm/atomic.h>
35
36#include "w1.h"
37#include "w1_io.h"
38#include "w1_log.h"
39#include "w1_int.h"
40#include "w1_family.h"
41#include "w1_netlink.h"
42
43MODULE_LICENSE("GPL");
44MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
45MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
46
47static int w1_timeout = 10;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040048static int w1_control_timeout = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049int w1_max_slave_count = 10;
50int w1_max_slave_ttl = 10;
51
52module_param_named(timeout, w1_timeout, int, 0);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040053module_param_named(control_timeout, w1_control_timeout, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054module_param_named(max_slave_count, w1_max_slave_count, int, 0);
55module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
56
57DEFINE_SPINLOCK(w1_mlock);
58LIST_HEAD(w1_masters);
59
60static pid_t control_thread;
61static int control_needs_exit;
62static DECLARE_COMPLETION(w1_control_complete);
63
64static int w1_master_match(struct device *dev, struct device_driver *drv)
65{
66 return 1;
67}
68
69static int w1_master_probe(struct device *dev)
70{
71 return -ENODEV;
72}
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static void w1_master_release(struct device *dev)
75{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040076 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040077
78 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
79
Evgeniy Polyakov2d1f87a2005-10-14 15:59:11 -070080 dev_fini_netlink(md);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040081 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
82 kfree(md);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85static void w1_slave_release(struct device *dev)
86{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040087 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040088
89 dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
90
91 while (atomic_read(&sl->refcnt)) {
92 dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
93 sl->name, atomic_read(&sl->refcnt));
94 if (msleep_interruptible(1000))
95 flush_signals(current);
96 }
97
98 w1_family_put(sl->family);
99 sl->master->slave_count--;
100
101 complete(&sl->released);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
103
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400104static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400106 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400107
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400108 return sprintf(buf, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400111static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400113 struct w1_slave *sl = kobj_to_w1_slave(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400115 atomic_inc(&sl->refcnt);
116 if (off > 8) {
117 count = 0;
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400118 } else {
119 if (off + count > 8)
120 count = 8 - off;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400121
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400122 memcpy(buf, (u8 *)&sl->reg_num, count);
123 }
124 atomic_dec(&sl->refcnt);
125
126 return count;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400127}
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400128
129static struct device_attribute w1_slave_attr_name =
130 __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
131
132static struct bin_attribute w1_slave_attr_bin_id = {
133 .attr = {
134 .name = "id",
135 .mode = S_IRUGO,
136 .owner = THIS_MODULE,
137 },
138 .size = 8,
139 .read = w1_slave_read_id,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400140};
141
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400142/* Default family */
143static struct w1_family w1_default_family;
144
Kay Sievers312c0042005-11-16 09:00:00 +0100145static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147static struct bus_type w1_bus_type = {
148 .name = "w1",
149 .match = w1_master_match,
Kay Sievers312c0042005-11-16 09:00:00 +0100150 .uevent = w1_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151};
152
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400153struct device_driver w1_master_driver = {
154 .name = "w1_master_driver",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 .bus = &w1_bus_type,
156 .probe = w1_master_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157};
158
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400159struct device w1_master_device = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .parent = NULL,
161 .bus = &w1_bus_type,
162 .bus_id = "w1 bus master",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400163 .driver = &w1_master_driver,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 .release = &w1_master_release
165};
166
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400167struct device_driver w1_slave_driver = {
168 .name = "w1_slave_driver",
169 .bus = &w1_bus_type,
170};
171
172struct device w1_slave_device = {
173 .parent = NULL,
174 .bus = &w1_bus_type,
175 .bus_id = "w1 bus slave",
176 .driver = &w1_slave_driver,
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400177 .release = &w1_slave_release
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400178};
179
Yani Ioannou060b8842005-05-17 06:44:04 -0400180static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400182 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (down_interruptible (&md->mutex))
186 return -EBUSY;
187
188 count = sprintf(buf, "%s\n", md->name);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 up(&md->mutex);
191
192 return count;
193}
194
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400195static ssize_t w1_master_attribute_store_search(struct device * dev,
196 struct device_attribute *attr,
197 const char * buf, size_t count)
198{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400199 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400200
201 if (down_interruptible (&md->mutex))
202 return -EBUSY;
203
204 md->search_count = simple_strtol(buf, NULL, 0);
205
206 up(&md->mutex);
207
208 return count;
209}
210
211static ssize_t w1_master_attribute_show_search(struct device *dev,
212 struct device_attribute *attr,
213 char *buf)
214{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400215 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400216 ssize_t count;
217
218 if (down_interruptible (&md->mutex))
219 return -EBUSY;
220
221 count = sprintf(buf, "%d\n", md->search_count);
222
223 up(&md->mutex);
224
225 return count;
226}
227
Yani Ioannou060b8842005-05-17 06:44:04 -0400228static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400230 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (down_interruptible(&md->mutex))
234 return -EBUSY;
235
236 count = sprintf(buf, "0x%p\n", md->bus_master);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 up(&md->mutex);
239 return count;
240}
241
Yani Ioannou060b8842005-05-17 06:44:04 -0400242static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 ssize_t count;
245 count = sprintf(buf, "%d\n", w1_timeout);
246 return count;
247}
248
Yani Ioannou060b8842005-05-17 06:44:04 -0400249static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400251 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (down_interruptible(&md->mutex))
255 return -EBUSY;
256
257 count = sprintf(buf, "%d\n", md->max_slave_count);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 up(&md->mutex);
260 return count;
261}
262
Yani Ioannou060b8842005-05-17 06:44:04 -0400263static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400265 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 if (down_interruptible(&md->mutex))
269 return -EBUSY;
270
271 count = sprintf(buf, "%lu\n", md->attempts);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 up(&md->mutex);
274 return count;
275}
276
Yani Ioannou060b8842005-05-17 06:44:04 -0400277static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400279 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (down_interruptible(&md->mutex))
283 return -EBUSY;
284
285 count = sprintf(buf, "%d\n", md->slave_count);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 up(&md->mutex);
288 return count;
289}
290
Yani Ioannou060b8842005-05-17 06:44:04 -0400291static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400293 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 int c = PAGE_SIZE;
295
296 if (down_interruptible(&md->mutex))
297 return -EBUSY;
298
299 if (md->slave_count == 0)
300 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
301 else {
302 struct list_head *ent, *n;
303 struct w1_slave *sl;
304
305 list_for_each_safe(ent, n, &md->slist) {
306 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
307
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400308 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 }
310 }
311
312 up(&md->mutex);
313
314 return PAGE_SIZE - c;
315}
316
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400317#define W1_MASTER_ATTR_RO(_name, _mode) \
318 struct device_attribute w1_master_attribute_##_name = \
319 __ATTR(w1_master_##_name, _mode, \
320 w1_master_attribute_show_##_name, NULL)
321
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400322#define W1_MASTER_ATTR_RW(_name, _mode) \
323 struct device_attribute w1_master_attribute_##_name = \
324 __ATTR(w1_master_##_name, _mode, \
325 w1_master_attribute_show_##_name, \
326 w1_master_attribute_store_##_name)
327
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400328static W1_MASTER_ATTR_RO(name, S_IRUGO);
329static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
330static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
331static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
332static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
333static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
334static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400335static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400336
337static struct attribute *w1_master_default_attrs[] = {
338 &w1_master_attribute_name.attr,
339 &w1_master_attribute_slaves.attr,
340 &w1_master_attribute_slave_count.attr,
341 &w1_master_attribute_max_slave_count.attr,
342 &w1_master_attribute_attempts.attr,
343 &w1_master_attribute_timeout.attr,
344 &w1_master_attribute_pointer.attr,
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400345 &w1_master_attribute_search.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400346 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347};
348
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400349static struct attribute_group w1_master_defattr_group = {
350 .attrs = w1_master_default_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351};
352
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400353int w1_create_master_attributes(struct w1_master *master)
354{
355 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
356}
357
358void w1_destroy_master_attributes(struct w1_master *master)
359{
360 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
361}
362
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400363#ifdef CONFIG_HOTPLUG
Kay Sievers312c0042005-11-16 09:00:00 +0100364static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400365{
366 struct w1_master *md = NULL;
367 struct w1_slave *sl = NULL;
368 char *event_owner, *name;
369 int err, cur_index=0, cur_len=0;
370
371 if (dev->driver == &w1_master_driver) {
372 md = container_of(dev, struct w1_master, dev);
373 event_owner = "master";
374 name = md->name;
375 } else if (dev->driver == &w1_slave_driver) {
376 sl = container_of(dev, struct w1_slave, dev);
377 event_owner = "slave";
378 name = sl->name;
379 } else {
Kay Sievers312c0042005-11-16 09:00:00 +0100380 dev_dbg(dev, "Unknown event.\n");
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400381 return -EINVAL;
382 }
383
384 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id);
385
386 if (dev->driver != &w1_slave_driver || !sl)
387 return 0;
388
Kay Sievers312c0042005-11-16 09:00:00 +0100389 err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400390 if (err)
391 return err;
392
Kay Sievers312c0042005-11-16 09:00:00 +0100393 err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400394 if (err)
395 return err;
396
397 return 0;
398};
399#else
Kay Sievers312c0042005-11-16 09:00:00 +0100400static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400401{
402 return 0;
403}
404#endif
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406static int __w1_attach_slave_device(struct w1_slave *sl)
407{
408 int err;
409
410 sl->dev.parent = &sl->master->dev;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400411 sl->dev.driver = &w1_slave_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 sl->dev.bus = &w1_bus_type;
413 sl->dev.release = &w1_slave_release;
414
415 snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400416 "%02x-%012llx",
417 (unsigned int) sl->reg_num.family,
418 (unsigned long long) sl->reg_num.id);
419 snprintf(&sl->name[0], sizeof(sl->name),
420 "%02x-%012llx",
421 (unsigned int) sl->reg_num.family,
422 (unsigned long long) sl->reg_num.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400424 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426 err = device_register(&sl->dev);
427 if (err < 0) {
428 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400429 "Device registration [%s] failed. err=%d\n",
430 sl->dev.bus_id, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return err;
432 }
433
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400434 /* Create "name" entry */
435 err = device_create_file(&sl->dev, &w1_slave_attr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (err < 0) {
437 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400438 "sysfs file creation for [%s] failed. err=%d\n",
439 sl->dev.bus_id, err);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400440 goto out_unreg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 }
442
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400443 /* Create "id" entry */
444 err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
445 if (err < 0) {
446 dev_err(&sl->dev,
447 "sysfs file creation for [%s] failed. err=%d\n",
448 sl->dev.bus_id, err);
449 goto out_rem1;
450 }
451
452 /* if the family driver needs to initialize something... */
453 if (sl->family->fops && sl->family->fops->add_slave &&
454 ((err = sl->family->fops->add_slave(sl)) < 0)) {
455 dev_err(&sl->dev,
456 "sysfs file creation for [%s] failed. err=%d\n",
457 sl->dev.bus_id, err);
458 goto out_rem2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
461 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
462
463 return 0;
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400464
465out_rem2:
466 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
467out_rem1:
468 device_remove_file(&sl->dev, &w1_slave_attr_name);
469out_unreg:
470 device_unregister(&sl->dev);
471 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472}
473
474static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
475{
476 struct w1_slave *sl;
477 struct w1_family *f;
478 int err;
479 struct w1_netlink_msg msg;
480
481 sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL);
482 if (!sl) {
483 dev_err(&dev->dev,
484 "%s: failed to allocate new slave device.\n",
485 __func__);
486 return -ENOMEM;
487 }
488
489 memset(sl, 0, sizeof(*sl));
490
491 sl->owner = THIS_MODULE;
492 sl->master = dev;
493 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
494
495 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
496 atomic_set(&sl->refcnt, 0);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400497 init_completion(&sl->released);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 spin_lock(&w1_flock);
500 f = w1_family_registered(rn->family);
501 if (!f) {
Evgeniy Polyakov99c5bfe2005-06-04 01:31:26 +0400502 f= &w1_default_family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
504 rn->family, rn->family,
505 (unsigned long long)rn->id, rn->crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 }
507 __w1_family_get(f);
508 spin_unlock(&w1_flock);
509
510 sl->family = f;
511
512
513 err = __w1_attach_slave_device(sl);
514 if (err < 0) {
515 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
516 sl->name);
517 w1_family_put(sl->family);
518 kfree(sl);
519 return err;
520 }
521
522 sl->ttl = dev->slave_ttl;
523 dev->slave_count++;
524
525 memcpy(&msg.id.id, rn, sizeof(msg.id.id));
526 msg.type = W1_SLAVE_ADD;
527 w1_netlink_send(dev, &msg);
528
529 return 0;
530}
531
532static void w1_slave_detach(struct w1_slave *sl)
533{
534 struct w1_netlink_msg msg;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400535
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400536 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400538 list_del(&sl->w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400540 if (sl->family->fops && sl->family->fops->remove_slave)
541 sl->family->fops->remove_slave(sl);
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
544 msg.type = W1_SLAVE_REMOVE;
545 w1_netlink_send(sl->master, &msg);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400546
547 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
548 device_remove_file(&sl->dev, &w1_slave_attr_name);
549 device_unregister(&sl->dev);
550
551 wait_for_completion(&sl->released);
552 kfree(sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300555static struct w1_master *w1_search_master(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
557 struct w1_master *dev;
558 int found = 0;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400559
560 spin_lock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
562 if (dev->bus_master->data == data) {
563 found = 1;
564 atomic_inc(&dev->refcnt);
565 break;
566 }
567 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400568 spin_unlock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 return (found)?dev:NULL;
571}
572
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400573void w1_reconnect_slaves(struct w1_family *f)
574{
575 struct w1_master *dev;
576
577 spin_lock_bh(&w1_mlock);
578 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400579 dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400580 dev->name, f->fid);
581 set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
582 }
583 spin_unlock_bh(&w1_mlock);
584}
585
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300586static void w1_slave_found(void *data, u64 rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
588 int slave_count;
589 struct w1_slave *sl;
590 struct list_head *ent;
591 struct w1_reg_num *tmp;
592 int family_found = 0;
593 struct w1_master *dev;
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400594 u64 rn_le = cpu_to_le64(rn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
596 dev = w1_search_master(data);
597 if (!dev) {
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300598 printk(KERN_ERR "Failed to find w1 master device for data %p, "
599 "it is impossible.\n", data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 return;
601 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 tmp = (struct w1_reg_num *) &rn;
604
605 slave_count = 0;
606 list_for_each(ent, &dev->slist) {
607
608 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
609
610 if (sl->reg_num.family == tmp->family &&
611 sl->reg_num.id == tmp->id &&
612 sl->reg_num.crc == tmp->crc) {
613 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
614 break;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400615 } else if (sl->reg_num.family == tmp->family) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 family_found = 1;
617 break;
618 }
619
620 slave_count++;
621 }
622
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700623 if (slave_count == dev->slave_count &&
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400624 rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700625 w1_attach_slave_device(dev, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 atomic_dec(&dev->refcnt);
629}
630
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400631/**
632 * Performs a ROM Search & registers any devices found.
633 * The 1-wire search is a simple binary tree search.
634 * For each bit of the address, we read two bits and write one bit.
635 * The bit written will put to sleep all devies that don't match that bit.
636 * When the two reads differ, the direction choice is obvious.
637 * When both bits are 0, we must choose a path to take.
638 * When we can scan all 64 bits without having to choose a path, we are done.
639 *
640 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
641 *
642 * @dev The master device to search
643 * @cb Function to call when a device is found
644 */
645void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400647 u64 last_rn, rn, tmp64;
648 int i, slave_count = 0;
649 int last_zero, last_device;
650 int search_bit, desc_bit;
651 u8 triplet_ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400653 search_bit = 0;
654 rn = last_rn = 0;
655 last_device = 0;
656 last_zero = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658 desc_bit = 64;
659
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400660 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
661 last_rn = rn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 rn = 0;
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 /*
665 * Reset bus and all 1-wire device state machines
666 * so they can respond to our requests.
667 *
668 * Return 0 - device(s) present, 1 - no devices present.
669 */
670 if (w1_reset_bus(dev)) {
Evgeniy Polyakov2da5bf82005-08-12 11:46:22 -0700671 dev_dbg(&dev->dev, "No devices present on the wire.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 break;
673 }
674
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400675 /* Start the search */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 w1_write_8(dev, W1_SEARCH);
677 for (i = 0; i < 64; ++i) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400678 /* Determine the direction/search bit */
679 if (i == desc_bit)
680 search_bit = 1; /* took the 0 path last time, so take the 1 path */
681 else if (i > desc_bit)
682 search_bit = 0; /* take the 0 path on the next branch */
683 else
684 search_bit = ((last_rn >> i) & 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400686 /** Read two bits and write one bit */
687 triplet_ret = w1_triplet(dev, search_bit);
688
689 /* quit if no device responded */
690 if ( (triplet_ret & 0x03) == 0x03 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 break;
692
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400693 /* If both directions were valid, and we took the 0 path... */
694 if (triplet_ret == 0)
695 last_zero = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400697 /* extract the direction taken & update the device number */
698 tmp64 = (triplet_ret >> 2);
699 rn |= (tmp64 << i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400702 if ( (triplet_ret & 0x03) != 0x03 ) {
703 if ( (desc_bit == last_zero) || (last_zero < 0))
704 last_device = 1;
705 desc_bit = last_zero;
706 cb(dev->bus_master->data, rn);
707 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
709}
710
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400711static int w1_control(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712{
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400713 struct w1_slave *sl, *sln;
714 struct w1_master *dev, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 int err, have_to_wait = 0;
716
717 daemonize("w1_control");
718 allow_signal(SIGTERM);
719
720 while (!control_needs_exit || have_to_wait) {
721 have_to_wait = 0;
722
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700723 try_to_freeze();
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400724 msleep_interruptible(w1_control_timeout * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 if (signal_pending(current))
727 flush_signals(current);
728
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400729 list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400730 if (!control_needs_exit && !dev->flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 continue;
732 /*
733 * Little race: we can create thread but not set the flag.
734 * Get a chance for external process to set flag up.
735 */
736 if (!dev->initialized) {
737 have_to_wait = 1;
738 continue;
739 }
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (control_needs_exit) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400742 set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 err = kill_proc(dev->kpid, SIGTERM, 1);
745 if (err)
746 dev_err(&dev->dev,
747 "Failed to send signal to w1 kernel thread %d.\n",
748 dev->kpid);
749 }
750
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400751 if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
752 wait_for_completion(&dev->dev_exited);
753 spin_lock_bh(&w1_mlock);
754 list_del(&dev->w1_master_entry);
755 spin_unlock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400757 down(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400758 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400759 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400760 }
761 w1_destroy_master_attributes(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400762 up(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400763 atomic_dec(&dev->refcnt);
764 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 }
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400766
767 if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400768 dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400769 down(&dev->mutex);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400770 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400771 if (sl->family->fid == W1_FAMILY_DEFAULT) {
772 struct w1_reg_num rn;
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400773
774 memcpy(&rn, &sl->reg_num, sizeof(rn));
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400775 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400776
777 w1_attach_slave_device(dev, &rn);
778 }
779 }
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400780 dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400781 clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
782 up(&dev->mutex);
783 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 }
785 }
786
787 complete_and_exit(&w1_control_complete, 0);
788}
789
790int w1_process(void *data)
791{
792 struct w1_master *dev = (struct w1_master *) data;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400793 struct w1_slave *sl, *sln;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 daemonize("%s", dev->name);
796 allow_signal(SIGTERM);
797
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400798 while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700799 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 msleep_interruptible(w1_timeout * 1000);
801
802 if (signal_pending(current))
803 flush_signals(current);
804
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400805 if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 break;
807
808 if (!dev->initialized)
809 continue;
810
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400811 if (dev->search_count == 0)
812 continue;
813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 if (down_interruptible(&dev->mutex))
815 continue;
816
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400817 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400818 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 w1_search_devices(dev, w1_slave_found);
821
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400822 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
823 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400824 w1_slave_detach(sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 dev->slave_count--;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400827 } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 sl->ttl = dev->slave_ttl;
829 }
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400830
831 if (dev->search_count > 0)
832 dev->search_count--;
833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 up(&dev->mutex);
835 }
836
837 atomic_dec(&dev->refcnt);
838 complete_and_exit(&dev->dev_exited, 0);
839
840 return 0;
841}
842
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400843static int w1_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844{
845 int retval;
846
847 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
848
849 retval = bus_register(&w1_bus_type);
850 if (retval) {
851 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
852 goto err_out_exit_init;
853 }
854
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400855 retval = driver_register(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 if (retval) {
857 printk(KERN_ERR
858 "Failed to register master driver. err=%d.\n",
859 retval);
860 goto err_out_bus_unregister;
861 }
862
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400863 retval = driver_register(&w1_slave_driver);
864 if (retval) {
865 printk(KERN_ERR
866 "Failed to register master driver. err=%d.\n",
867 retval);
868 goto err_out_master_unregister;
869 }
870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 control_thread = kernel_thread(&w1_control, NULL, 0);
872 if (control_thread < 0) {
873 printk(KERN_ERR "Failed to create control thread. err=%d\n",
874 control_thread);
875 retval = control_thread;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400876 goto err_out_slave_unregister;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 }
878
879 return 0;
880
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400881err_out_slave_unregister:
882 driver_unregister(&w1_slave_driver);
883
884err_out_master_unregister:
885 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887err_out_bus_unregister:
888 bus_unregister(&w1_bus_type);
889
890err_out_exit_init:
891 return retval;
892}
893
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400894static void w1_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
896 struct w1_master *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400898 list_for_each_entry(dev, &w1_masters, w1_master_entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 __w1_remove_master_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901 control_needs_exit = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 wait_for_completion(&w1_control_complete);
903
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400904 driver_unregister(&w1_slave_driver);
905 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 bus_unregister(&w1_bus_type);
907}
908
909module_init(w1_init);
910module_exit(w1_fini);