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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
Adrian Bunka9fb1c72005-12-13 14:04:33 -0800167static struct device_driver w1_slave_driver = {
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400168 .name = "w1_slave_driver",
169 .bus = &w1_bus_type,
170};
171
Adrian Bunka9fb1c72005-12-13 14:04:33 -0800172#if 0
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400173struct device w1_slave_device = {
174 .parent = NULL,
175 .bus = &w1_bus_type,
176 .bus_id = "w1 bus slave",
177 .driver = &w1_slave_driver,
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400178 .release = &w1_slave_release
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400179};
Adrian Bunka9fb1c72005-12-13 14:04:33 -0800180#endif /* 0 */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400181
Yani Ioannou060b8842005-05-17 06:44:04 -0400182static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400184 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (down_interruptible (&md->mutex))
188 return -EBUSY;
189
190 count = sprintf(buf, "%s\n", md->name);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 up(&md->mutex);
193
194 return count;
195}
196
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400197static ssize_t w1_master_attribute_store_search(struct device * dev,
198 struct device_attribute *attr,
199 const char * buf, size_t count)
200{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400201 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400202
203 if (down_interruptible (&md->mutex))
204 return -EBUSY;
205
206 md->search_count = simple_strtol(buf, NULL, 0);
207
208 up(&md->mutex);
209
210 return count;
211}
212
213static ssize_t w1_master_attribute_show_search(struct device *dev,
214 struct device_attribute *attr,
215 char *buf)
216{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400217 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400218 ssize_t count;
219
220 if (down_interruptible (&md->mutex))
221 return -EBUSY;
222
223 count = sprintf(buf, "%d\n", md->search_count);
224
225 up(&md->mutex);
226
227 return count;
228}
229
Yani Ioannou060b8842005-05-17 06:44:04 -0400230static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400232 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (down_interruptible(&md->mutex))
236 return -EBUSY;
237
238 count = sprintf(buf, "0x%p\n", md->bus_master);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 up(&md->mutex);
241 return count;
242}
243
Yani Ioannou060b8842005-05-17 06:44:04 -0400244static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 ssize_t count;
247 count = sprintf(buf, "%d\n", w1_timeout);
248 return count;
249}
250
Yani Ioannou060b8842005-05-17 06:44:04 -0400251static 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 -0700252{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400253 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (down_interruptible(&md->mutex))
257 return -EBUSY;
258
259 count = sprintf(buf, "%d\n", md->max_slave_count);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 up(&md->mutex);
262 return count;
263}
264
Yani Ioannou060b8842005-05-17 06:44:04 -0400265static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400267 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (down_interruptible(&md->mutex))
271 return -EBUSY;
272
273 count = sprintf(buf, "%lu\n", md->attempts);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 up(&md->mutex);
276 return count;
277}
278
Yani Ioannou060b8842005-05-17 06:44:04 -0400279static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400281 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 if (down_interruptible(&md->mutex))
285 return -EBUSY;
286
287 count = sprintf(buf, "%d\n", md->slave_count);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 up(&md->mutex);
290 return count;
291}
292
Yani Ioannou060b8842005-05-17 06:44:04 -0400293static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400295 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 int c = PAGE_SIZE;
297
298 if (down_interruptible(&md->mutex))
299 return -EBUSY;
300
301 if (md->slave_count == 0)
302 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
303 else {
304 struct list_head *ent, *n;
305 struct w1_slave *sl;
306
307 list_for_each_safe(ent, n, &md->slist) {
308 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
309
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400310 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
312 }
313
314 up(&md->mutex);
315
316 return PAGE_SIZE - c;
317}
318
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400319#define W1_MASTER_ATTR_RO(_name, _mode) \
320 struct device_attribute w1_master_attribute_##_name = \
321 __ATTR(w1_master_##_name, _mode, \
322 w1_master_attribute_show_##_name, NULL)
323
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400324#define W1_MASTER_ATTR_RW(_name, _mode) \
325 struct device_attribute w1_master_attribute_##_name = \
326 __ATTR(w1_master_##_name, _mode, \
327 w1_master_attribute_show_##_name, \
328 w1_master_attribute_store_##_name)
329
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400330static W1_MASTER_ATTR_RO(name, S_IRUGO);
331static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
332static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
333static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
334static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
335static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
336static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400337static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400338
339static struct attribute *w1_master_default_attrs[] = {
340 &w1_master_attribute_name.attr,
341 &w1_master_attribute_slaves.attr,
342 &w1_master_attribute_slave_count.attr,
343 &w1_master_attribute_max_slave_count.attr,
344 &w1_master_attribute_attempts.attr,
345 &w1_master_attribute_timeout.attr,
346 &w1_master_attribute_pointer.attr,
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400347 &w1_master_attribute_search.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400348 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349};
350
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400351static struct attribute_group w1_master_defattr_group = {
352 .attrs = w1_master_default_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353};
354
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400355int w1_create_master_attributes(struct w1_master *master)
356{
357 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
358}
359
Adrian Bunka9fb1c72005-12-13 14:04:33 -0800360static void w1_destroy_master_attributes(struct w1_master *master)
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400361{
362 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
363}
364
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400365#ifdef CONFIG_HOTPLUG
Kay Sievers312c0042005-11-16 09:00:00 +0100366static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400367{
368 struct w1_master *md = NULL;
369 struct w1_slave *sl = NULL;
370 char *event_owner, *name;
371 int err, cur_index=0, cur_len=0;
372
373 if (dev->driver == &w1_master_driver) {
374 md = container_of(dev, struct w1_master, dev);
375 event_owner = "master";
376 name = md->name;
377 } else if (dev->driver == &w1_slave_driver) {
378 sl = container_of(dev, struct w1_slave, dev);
379 event_owner = "slave";
380 name = sl->name;
381 } else {
Kay Sievers312c0042005-11-16 09:00:00 +0100382 dev_dbg(dev, "Unknown event.\n");
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400383 return -EINVAL;
384 }
385
386 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id);
387
388 if (dev->driver != &w1_slave_driver || !sl)
389 return 0;
390
Andrew Mortonf73b5e72006-01-14 00:05:59 -0800391 err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
392 &cur_len, "W1_FID=%02X", sl->reg_num.family);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400393 if (err)
394 return err;
395
Andrew Mortonf73b5e72006-01-14 00:05:59 -0800396 err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
397 &cur_len, "W1_SLAVE_ID=%024LX",
398 (unsigned long long)sl->reg_num.id);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400399 if (err)
400 return err;
401
402 return 0;
403};
404#else
Kay Sievers312c0042005-11-16 09:00:00 +0100405static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400406{
407 return 0;
408}
409#endif
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411static int __w1_attach_slave_device(struct w1_slave *sl)
412{
413 int err;
414
415 sl->dev.parent = &sl->master->dev;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400416 sl->dev.driver = &w1_slave_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 sl->dev.bus = &w1_bus_type;
418 sl->dev.release = &w1_slave_release;
419
420 snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400421 "%02x-%012llx",
422 (unsigned int) sl->reg_num.family,
423 (unsigned long long) sl->reg_num.id);
424 snprintf(&sl->name[0], sizeof(sl->name),
425 "%02x-%012llx",
426 (unsigned int) sl->reg_num.family,
427 (unsigned long long) sl->reg_num.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400429 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 err = device_register(&sl->dev);
432 if (err < 0) {
433 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400434 "Device registration [%s] failed. err=%d\n",
435 sl->dev.bus_id, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 return err;
437 }
438
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400439 /* Create "name" entry */
440 err = device_create_file(&sl->dev, &w1_slave_attr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (err < 0) {
442 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400443 "sysfs file creation for [%s] failed. err=%d\n",
444 sl->dev.bus_id, err);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400445 goto out_unreg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 }
447
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400448 /* Create "id" entry */
449 err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
450 if (err < 0) {
451 dev_err(&sl->dev,
452 "sysfs file creation for [%s] failed. err=%d\n",
453 sl->dev.bus_id, err);
454 goto out_rem1;
455 }
456
457 /* if the family driver needs to initialize something... */
458 if (sl->family->fops && sl->family->fops->add_slave &&
459 ((err = sl->family->fops->add_slave(sl)) < 0)) {
460 dev_err(&sl->dev,
461 "sysfs file creation for [%s] failed. err=%d\n",
462 sl->dev.bus_id, err);
463 goto out_rem2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
465
466 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
467
468 return 0;
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400469
470out_rem2:
471 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
472out_rem1:
473 device_remove_file(&sl->dev, &w1_slave_attr_name);
474out_unreg:
475 device_unregister(&sl->dev);
476 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
479static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
480{
481 struct w1_slave *sl;
482 struct w1_family *f;
483 int err;
484 struct w1_netlink_msg msg;
485
486 sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL);
487 if (!sl) {
488 dev_err(&dev->dev,
489 "%s: failed to allocate new slave device.\n",
490 __func__);
491 return -ENOMEM;
492 }
493
494 memset(sl, 0, sizeof(*sl));
495
496 sl->owner = THIS_MODULE;
497 sl->master = dev;
498 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
499
500 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
501 atomic_set(&sl->refcnt, 0);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400502 init_completion(&sl->released);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 spin_lock(&w1_flock);
505 f = w1_family_registered(rn->family);
506 if (!f) {
Evgeniy Polyakov99c5bfe2005-06-04 01:31:26 +0400507 f= &w1_default_family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
509 rn->family, rn->family,
510 (unsigned long long)rn->id, rn->crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 }
512 __w1_family_get(f);
513 spin_unlock(&w1_flock);
514
515 sl->family = f;
516
517
518 err = __w1_attach_slave_device(sl);
519 if (err < 0) {
520 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
521 sl->name);
522 w1_family_put(sl->family);
523 kfree(sl);
524 return err;
525 }
526
527 sl->ttl = dev->slave_ttl;
528 dev->slave_count++;
529
530 memcpy(&msg.id.id, rn, sizeof(msg.id.id));
531 msg.type = W1_SLAVE_ADD;
532 w1_netlink_send(dev, &msg);
533
534 return 0;
535}
536
537static void w1_slave_detach(struct w1_slave *sl)
538{
539 struct w1_netlink_msg msg;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400540
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400541 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400543 list_del(&sl->w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400545 if (sl->family->fops && sl->family->fops->remove_slave)
546 sl->family->fops->remove_slave(sl);
547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
549 msg.type = W1_SLAVE_REMOVE;
550 w1_netlink_send(sl->master, &msg);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400551
552 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
553 device_remove_file(&sl->dev, &w1_slave_attr_name);
554 device_unregister(&sl->dev);
555
556 wait_for_completion(&sl->released);
557 kfree(sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300560static struct w1_master *w1_search_master(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
562 struct w1_master *dev;
563 int found = 0;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400564
565 spin_lock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
567 if (dev->bus_master->data == data) {
568 found = 1;
569 atomic_inc(&dev->refcnt);
570 break;
571 }
572 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400573 spin_unlock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 return (found)?dev:NULL;
576}
577
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400578void w1_reconnect_slaves(struct w1_family *f)
579{
580 struct w1_master *dev;
581
582 spin_lock_bh(&w1_mlock);
583 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400584 dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400585 dev->name, f->fid);
586 set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
587 }
588 spin_unlock_bh(&w1_mlock);
589}
590
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300591static void w1_slave_found(void *data, u64 rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
593 int slave_count;
594 struct w1_slave *sl;
595 struct list_head *ent;
596 struct w1_reg_num *tmp;
597 int family_found = 0;
598 struct w1_master *dev;
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400599 u64 rn_le = cpu_to_le64(rn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601 dev = w1_search_master(data);
602 if (!dev) {
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300603 printk(KERN_ERR "Failed to find w1 master device for data %p, "
604 "it is impossible.\n", data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return;
606 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 tmp = (struct w1_reg_num *) &rn;
609
610 slave_count = 0;
611 list_for_each(ent, &dev->slist) {
612
613 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
614
615 if (sl->reg_num.family == tmp->family &&
616 sl->reg_num.id == tmp->id &&
617 sl->reg_num.crc == tmp->crc) {
618 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
619 break;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400620 } else if (sl->reg_num.family == tmp->family) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 family_found = 1;
622 break;
623 }
624
625 slave_count++;
626 }
627
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700628 if (slave_count == dev->slave_count &&
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400629 rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700630 w1_attach_slave_device(dev, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 atomic_dec(&dev->refcnt);
634}
635
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400636/**
637 * Performs a ROM Search & registers any devices found.
638 * The 1-wire search is a simple binary tree search.
639 * For each bit of the address, we read two bits and write one bit.
640 * The bit written will put to sleep all devies that don't match that bit.
641 * When the two reads differ, the direction choice is obvious.
642 * When both bits are 0, we must choose a path to take.
643 * When we can scan all 64 bits without having to choose a path, we are done.
644 *
645 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
646 *
647 * @dev The master device to search
648 * @cb Function to call when a device is found
649 */
650void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400652 u64 last_rn, rn, tmp64;
653 int i, slave_count = 0;
654 int last_zero, last_device;
655 int search_bit, desc_bit;
656 u8 triplet_ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400658 search_bit = 0;
659 rn = last_rn = 0;
660 last_device = 0;
661 last_zero = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 desc_bit = 64;
664
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400665 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
666 last_rn = rn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 rn = 0;
668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 /*
670 * Reset bus and all 1-wire device state machines
671 * so they can respond to our requests.
672 *
673 * Return 0 - device(s) present, 1 - no devices present.
674 */
675 if (w1_reset_bus(dev)) {
Evgeniy Polyakov2da5bf82005-08-12 11:46:22 -0700676 dev_dbg(&dev->dev, "No devices present on the wire.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 break;
678 }
679
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400680 /* Start the search */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 w1_write_8(dev, W1_SEARCH);
682 for (i = 0; i < 64; ++i) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400683 /* Determine the direction/search bit */
684 if (i == desc_bit)
685 search_bit = 1; /* took the 0 path last time, so take the 1 path */
686 else if (i > desc_bit)
687 search_bit = 0; /* take the 0 path on the next branch */
688 else
689 search_bit = ((last_rn >> i) & 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400691 /** Read two bits and write one bit */
692 triplet_ret = w1_triplet(dev, search_bit);
693
694 /* quit if no device responded */
695 if ( (triplet_ret & 0x03) == 0x03 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 break;
697
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400698 /* If both directions were valid, and we took the 0 path... */
699 if (triplet_ret == 0)
700 last_zero = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400702 /* extract the direction taken & update the device number */
703 tmp64 = (triplet_ret >> 2);
704 rn |= (tmp64 << i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400707 if ( (triplet_ret & 0x03) != 0x03 ) {
708 if ( (desc_bit == last_zero) || (last_zero < 0))
709 last_device = 1;
710 desc_bit = last_zero;
711 cb(dev->bus_master->data, rn);
712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
714}
715
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400716static int w1_control(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717{
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400718 struct w1_slave *sl, *sln;
719 struct w1_master *dev, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 int err, have_to_wait = 0;
721
722 daemonize("w1_control");
723 allow_signal(SIGTERM);
724
725 while (!control_needs_exit || have_to_wait) {
726 have_to_wait = 0;
727
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700728 try_to_freeze();
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400729 msleep_interruptible(w1_control_timeout * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
731 if (signal_pending(current))
732 flush_signals(current);
733
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400734 list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400735 if (!control_needs_exit && !dev->flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 continue;
737 /*
738 * Little race: we can create thread but not set the flag.
739 * Get a chance for external process to set flag up.
740 */
741 if (!dev->initialized) {
742 have_to_wait = 1;
743 continue;
744 }
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 if (control_needs_exit) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400747 set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
749 err = kill_proc(dev->kpid, SIGTERM, 1);
750 if (err)
751 dev_err(&dev->dev,
752 "Failed to send signal to w1 kernel thread %d.\n",
753 dev->kpid);
754 }
755
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400756 if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
757 wait_for_completion(&dev->dev_exited);
758 spin_lock_bh(&w1_mlock);
759 list_del(&dev->w1_master_entry);
760 spin_unlock_bh(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400762 down(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400763 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400764 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400765 }
766 w1_destroy_master_attributes(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400767 up(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400768 atomic_dec(&dev->refcnt);
769 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 }
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400771
772 if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400773 dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400774 down(&dev->mutex);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400775 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400776 if (sl->family->fid == W1_FAMILY_DEFAULT) {
777 struct w1_reg_num rn;
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400778
779 memcpy(&rn, &sl->reg_num, sizeof(rn));
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400780 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400781
782 w1_attach_slave_device(dev, &rn);
783 }
784 }
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400785 dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400786 clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
787 up(&dev->mutex);
788 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
790 }
791
792 complete_and_exit(&w1_control_complete, 0);
793}
794
795int w1_process(void *data)
796{
797 struct w1_master *dev = (struct w1_master *) data;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400798 struct w1_slave *sl, *sln;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 daemonize("%s", dev->name);
801 allow_signal(SIGTERM);
802
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400803 while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700804 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 msleep_interruptible(w1_timeout * 1000);
806
807 if (signal_pending(current))
808 flush_signals(current);
809
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400810 if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 break;
812
813 if (!dev->initialized)
814 continue;
815
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400816 if (dev->search_count == 0)
817 continue;
818
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 if (down_interruptible(&dev->mutex))
820 continue;
821
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400822 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400823 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 w1_search_devices(dev, w1_slave_found);
826
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400827 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
828 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400829 w1_slave_detach(sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 dev->slave_count--;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400832 } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 sl->ttl = dev->slave_ttl;
834 }
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400835
836 if (dev->search_count > 0)
837 dev->search_count--;
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 up(&dev->mutex);
840 }
841
842 atomic_dec(&dev->refcnt);
843 complete_and_exit(&dev->dev_exited, 0);
844
845 return 0;
846}
847
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400848static int w1_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
850 int retval;
851
852 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
853
854 retval = bus_register(&w1_bus_type);
855 if (retval) {
856 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
857 goto err_out_exit_init;
858 }
859
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400860 retval = driver_register(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 if (retval) {
862 printk(KERN_ERR
863 "Failed to register master driver. err=%d.\n",
864 retval);
865 goto err_out_bus_unregister;
866 }
867
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400868 retval = driver_register(&w1_slave_driver);
869 if (retval) {
870 printk(KERN_ERR
871 "Failed to register master driver. err=%d.\n",
872 retval);
873 goto err_out_master_unregister;
874 }
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 control_thread = kernel_thread(&w1_control, NULL, 0);
877 if (control_thread < 0) {
878 printk(KERN_ERR "Failed to create control thread. err=%d\n",
879 control_thread);
880 retval = control_thread;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400881 goto err_out_slave_unregister;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 }
883
884 return 0;
885
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400886err_out_slave_unregister:
887 driver_unregister(&w1_slave_driver);
888
889err_out_master_unregister:
890 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
892err_out_bus_unregister:
893 bus_unregister(&w1_bus_type);
894
895err_out_exit_init:
896 return retval;
897}
898
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400899static void w1_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
901 struct w1_master *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400903 list_for_each_entry(dev, &w1_masters, w1_master_entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 __w1_remove_master_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
906 control_needs_exit = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 wait_for_completion(&w1_control_complete);
908
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400909 driver_unregister(&w1_slave_driver);
910 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 bus_unregister(&w1_bus_type);
912}
913
914module_init(w1_init);
915module_exit(w1_fini);