blob: 5d7341520544f98727308c3f4f701c90129b1940 [file] [log] [blame]
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 *
Evgeniy Polyakova8018762011-08-25 15:59:06 -07004 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
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>
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +030033#include <linux/kthread.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080034#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Arun Sharma600634972011-07-26 16:09:06 -070036#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include "w1.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "w1_log.h"
40#include "w1_int.h"
41#include "w1_family.h"
42#include "w1_netlink.h"
43
44MODULE_LICENSE("GPL");
Evgeniy Polyakova8018762011-08-25 15:59:06 -070045MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
47
48static int w1_timeout = 10;
David Friesa1613052014-01-15 22:29:15 -060049int w1_max_slave_count = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050int w1_max_slave_ttl = 10;
51
52module_param_named(timeout, w1_timeout, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060053MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches");
54/* A search stops when w1_max_slave_count devices have been found in that
55 * search. The next search will start over and detect the same set of devices
56 * on a static 1-wire bus. Memory is not allocated based on this number, just
57 * on the number of devices known to the kernel. Having a high number does not
58 * consume additional resources. As a special case, if there is only one
59 * device on the network and w1_max_slave_count is set to 1, the device id can
60 * be read directly skipping the normal slower search process.
61 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062module_param_named(max_slave_count, w1_max_slave_count, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060063MODULE_PARM_DESC(max_slave_count,
64 "maximum number of slaves detected in a search");
Linus Torvalds1da177e2005-04-16 15:20:36 -070065module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060066MODULE_PARM_DESC(slave_ttl,
67 "Number of searches not seeing a slave before it will be removed");
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +040069DEFINE_MUTEX(w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070LIST_HEAD(w1_masters);
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static int w1_master_match(struct device *dev, struct device_driver *drv)
73{
74 return 1;
75}
76
77static int w1_master_probe(struct device *dev)
78{
79 return -ENODEV;
80}
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082static void w1_master_release(struct device *dev)
83{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040084 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040085
86 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040087 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
88 kfree(md);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
90
91static void w1_slave_release(struct device *dev)
92{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040093 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040094
David Fries9fcbbac2014-01-15 22:29:18 -060095 dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040096
97 w1_family_put(sl->family);
98 sl->master->slave_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700101static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400103 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400104
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400105 return sprintf(buf, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700107static DEVICE_ATTR_RO(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700109static ssize_t id_show(struct device *dev,
David Fries07e00342008-10-15 22:04:50 -0700110 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
David Fries07e00342008-10-15 22:04:50 -0700112 struct w1_slave *sl = dev_to_w1_slave(dev);
113 ssize_t count = sizeof(sl->reg_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
David Fries07e00342008-10-15 22:04:50 -0700115 memcpy(buf, (u8 *)&sl->reg_num, count);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400116 return count;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400117}
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700118static DEVICE_ATTR_RO(id);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400119
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700120static struct attribute *w1_slave_attrs[] = {
121 &dev_attr_name.attr,
122 &dev_attr_id.attr,
123 NULL,
124};
125ATTRIBUTE_GROUPS(w1_slave);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400126
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400127/* Default family */
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300128
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700129static ssize_t rw_write(struct file *filp, struct kobject *kobj,
130 struct bin_attribute *bin_attr, char *buf, loff_t off,
131 size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300132{
133 struct w1_slave *sl = kobj_to_w1_slave(kobj);
134
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400135 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300136 if (w1_reset_select_slave(sl)) {
137 count = 0;
138 goto out_up;
139 }
140
141 w1_write_block(sl->master, buf, count);
142
143out_up:
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400144 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300145 return count;
146}
147
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700148static ssize_t rw_read(struct file *filp, struct kobject *kobj,
149 struct bin_attribute *bin_attr, char *buf, loff_t off,
150 size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300151{
152 struct w1_slave *sl = kobj_to_w1_slave(kobj);
153
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400154 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300155 w1_read_block(sl->master, buf, count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400156 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300157 return count;
158}
159
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700160static BIN_ATTR_RW(rw, PAGE_SIZE);
161
162static struct bin_attribute *w1_slave_bin_attrs[] = {
163 &bin_attr_rw,
164 NULL,
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300165};
166
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700167static const struct attribute_group w1_slave_default_group = {
168 .bin_attrs = w1_slave_bin_attrs,
169};
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300170
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700171static const struct attribute_group *w1_slave_default_groups[] = {
172 &w1_slave_default_group,
173 NULL,
174};
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300175
176static struct w1_family_ops w1_default_fops = {
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700177 .groups = w1_slave_default_groups,
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300178};
179
180static struct w1_family w1_default_family = {
181 .fops = &w1_default_fops,
182};
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400183
Kay Sievers7eff2e72007-08-14 15:15:12 +0200184static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186static struct bus_type w1_bus_type = {
187 .name = "w1",
188 .match = w1_master_match,
Kay Sievers312c0042005-11-16 09:00:00 +0100189 .uevent = w1_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190};
191
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400192struct device_driver w1_master_driver = {
193 .name = "w1_master_driver",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 .bus = &w1_bus_type,
195 .probe = w1_master_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196};
197
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400198struct device w1_master_device = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 .parent = NULL,
200 .bus = &w1_bus_type,
Kay Sievers40f91de2009-01-06 10:44:34 -0800201 .init_name = "w1 bus master",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400202 .driver = &w1_master_driver,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 .release = &w1_master_release
204};
205
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400206static struct device_driver w1_slave_driver = {
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400207 .name = "w1_slave_driver",
208 .bus = &w1_bus_type,
209};
210
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400211#if 0
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400212struct device w1_slave_device = {
213 .parent = NULL,
214 .bus = &w1_bus_type,
Kay Sievers40f91de2009-01-06 10:44:34 -0800215 .init_name = "w1 bus slave",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400216 .driver = &w1_slave_driver,
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400217 .release = &w1_slave_release
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400218};
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400219#endif /* 0 */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400220
Yani Ioannou060b8842005-05-17 06:44:04 -0400221static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400223 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400225
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400226 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 count = sprintf(buf, "%s\n", md->name);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400228 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 return count;
231}
232
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400233static ssize_t w1_master_attribute_store_search(struct device * dev,
234 struct device_attribute *attr,
235 const char * buf, size_t count)
236{
David Fries6a158c02008-10-15 22:04:42 -0700237 long tmp;
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400238 struct w1_master *md = dev_to_w1_master(dev);
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700239 int ret;
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400240
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700241 ret = kstrtol(buf, 0, &tmp);
242 if (ret)
243 return ret;
David Fries6a158c02008-10-15 22:04:42 -0700244
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400245 mutex_lock(&md->mutex);
David Fries6a158c02008-10-15 22:04:42 -0700246 md->search_count = tmp;
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400247 mutex_unlock(&md->mutex);
David Friesaf8c7232014-01-15 22:29:14 -0600248 /* Only wake if it is going to be searching. */
249 if (tmp)
250 wake_up_process(md->thread);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400251
252 return count;
253}
254
255static ssize_t w1_master_attribute_show_search(struct device *dev,
256 struct device_attribute *attr,
257 char *buf)
258{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400259 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400260 ssize_t count;
261
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400262 mutex_lock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400263 count = sprintf(buf, "%d\n", md->search_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400264 mutex_unlock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400265
266 return count;
267}
268
David Fries6a158c02008-10-15 22:04:42 -0700269static ssize_t w1_master_attribute_store_pullup(struct device *dev,
270 struct device_attribute *attr,
271 const char *buf, size_t count)
272{
273 long tmp;
274 struct w1_master *md = dev_to_w1_master(dev);
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700275 int ret;
David Fries6a158c02008-10-15 22:04:42 -0700276
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700277 ret = kstrtol(buf, 0, &tmp);
278 if (ret)
279 return ret;
David Fries6a158c02008-10-15 22:04:42 -0700280
281 mutex_lock(&md->mutex);
282 md->enable_pullup = tmp;
283 mutex_unlock(&md->mutex);
David Fries6a158c02008-10-15 22:04:42 -0700284
285 return count;
286}
287
288static ssize_t w1_master_attribute_show_pullup(struct device *dev,
289 struct device_attribute *attr,
290 char *buf)
291{
292 struct w1_master *md = dev_to_w1_master(dev);
293 ssize_t count;
294
295 mutex_lock(&md->mutex);
296 count = sprintf(buf, "%d\n", md->enable_pullup);
297 mutex_unlock(&md->mutex);
298
299 return count;
300}
301
Yani Ioannou060b8842005-05-17 06:44:04 -0400302static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400304 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400306
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400307 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 count = sprintf(buf, "0x%p\n", md->bus_master);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400309 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 return count;
311}
312
Yani Ioannou060b8842005-05-17 06:44:04 -0400313static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
315 ssize_t count;
316 count = sprintf(buf, "%d\n", w1_timeout);
317 return count;
318}
319
David Friesa1613052014-01-15 22:29:15 -0600320static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
321 struct device_attribute *attr, const char *buf, size_t count)
322{
Dan Carpentera7155f42014-02-12 00:07:55 +0300323 int tmp;
David Friesa1613052014-01-15 22:29:15 -0600324 struct w1_master *md = dev_to_w1_master(dev);
325
Dan Carpentera7155f42014-02-12 00:07:55 +0300326 if (kstrtoint(buf, 0, &tmp) == -EINVAL || tmp < 1)
David Friesa1613052014-01-15 22:29:15 -0600327 return -EINVAL;
328
329 mutex_lock(&md->mutex);
330 md->max_slave_count = tmp;
331 /* allow each time the max_slave_count is updated */
332 clear_bit(W1_WARN_MAX_COUNT, &md->flags);
333 mutex_unlock(&md->mutex);
334
335 return count;
336}
337
Yani Ioannou060b8842005-05-17 06:44:04 -0400338static 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 -0700339{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400340 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400342
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400343 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 count = sprintf(buf, "%d\n", md->max_slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400345 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 return count;
347}
348
Yani Ioannou060b8842005-05-17 06:44:04 -0400349static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400351 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400353
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400354 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 count = sprintf(buf, "%lu\n", md->attempts);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400356 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return count;
358}
359
Yani Ioannou060b8842005-05-17 06:44:04 -0400360static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400362 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400364
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400365 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 count = sprintf(buf, "%d\n", md->slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400367 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return count;
369}
370
David Fries9b467412008-10-15 22:04:43 -0700371static ssize_t w1_master_attribute_show_slaves(struct device *dev,
372 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400374 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int c = PAGE_SIZE;
David Fries9fcbbac2014-01-15 22:29:18 -0600376 struct list_head *ent, *n;
377 struct w1_slave *sl = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
David Fries9fcbbac2014-01-15 22:29:18 -0600379 mutex_lock(&md->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
David Fries9fcbbac2014-01-15 22:29:18 -0600381 list_for_each_safe(ent, n, &md->slist) {
382 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
David Fries9fcbbac2014-01-15 22:29:18 -0600384 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 }
David Fries9fcbbac2014-01-15 22:29:18 -0600386 if (!sl)
387 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
David Fries9fcbbac2014-01-15 22:29:18 -0600389 mutex_unlock(&md->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 return PAGE_SIZE - c;
392}
393
David Fries9b467412008-10-15 22:04:43 -0700394static ssize_t w1_master_attribute_show_add(struct device *dev,
395 struct device_attribute *attr, char *buf)
396{
397 int c = PAGE_SIZE;
398 c -= snprintf(buf+PAGE_SIZE - c, c,
399 "write device id xx-xxxxxxxxxxxx to add slave\n");
400 return PAGE_SIZE - c;
401}
402
403static int w1_atoreg_num(struct device *dev, const char *buf, size_t count,
404 struct w1_reg_num *rn)
405{
406 unsigned int family;
407 unsigned long long id;
408 int i;
409 u64 rn64_le;
410
411 /* The CRC value isn't read from the user because the sysfs directory
412 * doesn't include it and most messages from the bus search don't
413 * print it either. It would be unreasonable for the user to then
414 * provide it.
415 */
416 const char *error_msg = "bad slave string format, expecting "
417 "ff-dddddddddddd\n";
418
419 if (buf[2] != '-') {
420 dev_err(dev, "%s", error_msg);
421 return -EINVAL;
422 }
423 i = sscanf(buf, "%02x-%012llx", &family, &id);
424 if (i != 2) {
425 dev_err(dev, "%s", error_msg);
426 return -EINVAL;
427 }
428 rn->family = family;
429 rn->id = id;
430
431 rn64_le = cpu_to_le64(*(u64 *)rn);
432 rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7);
433
434#if 0
435 dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n",
436 rn->family, (unsigned long long)rn->id, rn->crc);
437#endif
438
439 return 0;
440}
441
442/* Searches the slaves in the w1_master and returns a pointer or NULL.
David Fries9fcbbac2014-01-15 22:29:18 -0600443 * Note: must not hold list_mutex
David Fries9b467412008-10-15 22:04:43 -0700444 */
David Fries70b34d22014-01-15 22:29:17 -0600445struct w1_slave *w1_slave_search_device(struct w1_master *dev,
David Fries9b467412008-10-15 22:04:43 -0700446 struct w1_reg_num *rn)
447{
448 struct w1_slave *sl;
David Fries9fcbbac2014-01-15 22:29:18 -0600449 mutex_lock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700450 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
451 if (sl->reg_num.family == rn->family &&
452 sl->reg_num.id == rn->id &&
453 sl->reg_num.crc == rn->crc) {
David Fries9fcbbac2014-01-15 22:29:18 -0600454 mutex_unlock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700455 return sl;
456 }
457 }
David Fries9fcbbac2014-01-15 22:29:18 -0600458 mutex_unlock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700459 return NULL;
460}
461
462static ssize_t w1_master_attribute_store_add(struct device *dev,
463 struct device_attribute *attr,
464 const char *buf, size_t count)
465{
466 struct w1_master *md = dev_to_w1_master(dev);
467 struct w1_reg_num rn;
468 struct w1_slave *sl;
469 ssize_t result = count;
470
471 if (w1_atoreg_num(dev, buf, count, &rn))
472 return -EINVAL;
473
474 mutex_lock(&md->mutex);
475 sl = w1_slave_search_device(md, &rn);
476 /* It would be nice to do a targeted search one the one-wire bus
477 * for the new device to see if it is out there or not. But the
478 * current search doesn't support that.
479 */
480 if (sl) {
481 dev_info(dev, "Device %s already exists\n", sl->name);
482 result = -EINVAL;
483 } else {
484 w1_attach_slave_device(md, &rn);
485 }
486 mutex_unlock(&md->mutex);
487
488 return result;
489}
490
491static ssize_t w1_master_attribute_show_remove(struct device *dev,
492 struct device_attribute *attr, char *buf)
493{
494 int c = PAGE_SIZE;
495 c -= snprintf(buf+PAGE_SIZE - c, c,
496 "write device id xx-xxxxxxxxxxxx to remove slave\n");
497 return PAGE_SIZE - c;
498}
499
500static ssize_t w1_master_attribute_store_remove(struct device *dev,
501 struct device_attribute *attr,
502 const char *buf, size_t count)
503{
504 struct w1_master *md = dev_to_w1_master(dev);
505 struct w1_reg_num rn;
506 struct w1_slave *sl;
507 ssize_t result = count;
508
509 if (w1_atoreg_num(dev, buf, count, &rn))
510 return -EINVAL;
511
512 mutex_lock(&md->mutex);
513 sl = w1_slave_search_device(md, &rn);
514 if (sl) {
David Fries9fcbbac2014-01-15 22:29:18 -0600515 result = w1_slave_detach(sl);
516 /* refcnt 0 means it was detached in the call */
517 if (result == 0)
518 result = count;
David Fries9b467412008-10-15 22:04:43 -0700519 } else {
520 dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family,
521 (unsigned long long)rn.id);
522 result = -EINVAL;
523 }
524 mutex_unlock(&md->mutex);
525
526 return result;
527}
528
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400529#define W1_MASTER_ATTR_RO(_name, _mode) \
530 struct device_attribute w1_master_attribute_##_name = \
531 __ATTR(w1_master_##_name, _mode, \
532 w1_master_attribute_show_##_name, NULL)
533
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400534#define W1_MASTER_ATTR_RW(_name, _mode) \
535 struct device_attribute w1_master_attribute_##_name = \
536 __ATTR(w1_master_##_name, _mode, \
537 w1_master_attribute_show_##_name, \
538 w1_master_attribute_store_##_name)
539
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400540static W1_MASTER_ATTR_RO(name, S_IRUGO);
541static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
542static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
David Friesa1613052014-01-15 22:29:15 -0600543static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400544static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
545static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
546static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
Brian Swetland12aa4c62010-10-27 15:34:49 -0700547static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP);
548static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP);
549static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP);
550static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400551
552static struct attribute *w1_master_default_attrs[] = {
553 &w1_master_attribute_name.attr,
554 &w1_master_attribute_slaves.attr,
555 &w1_master_attribute_slave_count.attr,
556 &w1_master_attribute_max_slave_count.attr,
557 &w1_master_attribute_attempts.attr,
558 &w1_master_attribute_timeout.attr,
559 &w1_master_attribute_pointer.attr,
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400560 &w1_master_attribute_search.attr,
David Fries6a158c02008-10-15 22:04:42 -0700561 &w1_master_attribute_pullup.attr,
David Fries9b467412008-10-15 22:04:43 -0700562 &w1_master_attribute_add.attr,
563 &w1_master_attribute_remove.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400564 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565};
566
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400567static struct attribute_group w1_master_defattr_group = {
568 .attrs = w1_master_default_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569};
570
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400571int w1_create_master_attributes(struct w1_master *master)
572{
573 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
574}
575
David Friesc30c9b12008-10-15 22:04:38 -0700576void w1_destroy_master_attributes(struct w1_master *master)
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400577{
578 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
579}
580
Kay Sievers7eff2e72007-08-14 15:15:12 +0200581static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400582{
583 struct w1_master *md = NULL;
584 struct w1_slave *sl = NULL;
585 char *event_owner, *name;
Devendra Naga526be412012-05-19 07:31:54 +0400586 int err = 0;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400587
588 if (dev->driver == &w1_master_driver) {
589 md = container_of(dev, struct w1_master, dev);
590 event_owner = "master";
591 name = md->name;
592 } else if (dev->driver == &w1_slave_driver) {
593 sl = container_of(dev, struct w1_slave, dev);
594 event_owner = "slave";
595 name = sl->name;
596 } else {
Kay Sievers312c0042005-11-16 09:00:00 +0100597 dev_dbg(dev, "Unknown event.\n");
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400598 return -EINVAL;
599 }
600
Andrew Mortonc6976a42006-05-14 21:43:50 -0700601 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
Kay Sievers40f91de2009-01-06 10:44:34 -0800602 event_owner, name, dev_name(dev));
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400603
604 if (dev->driver != &w1_slave_driver || !sl)
Devendra Naga526be412012-05-19 07:31:54 +0400605 goto end;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400606
Kay Sievers7eff2e72007-08-14 15:15:12 +0200607 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400608 if (err)
Devendra Naga526be412012-05-19 07:31:54 +0400609 goto end;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400610
Kay Sievers7eff2e72007-08-14 15:15:12 +0200611 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
612 (unsigned long long)sl->reg_num.id);
Devendra Naga526be412012-05-19 07:31:54 +0400613end:
614 return err;
615}
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400616
David Fries18d7f892014-04-16 01:21:21 -0500617static int w1_family_notify(unsigned long action, struct w1_slave *sl)
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700618{
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700619 struct w1_family_ops *fops;
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700620 int err;
621
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700622 fops = sl->family->fops;
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700623
Hans-Frieder Vogt2962aec2013-10-06 21:13:35 +0200624 if (!fops)
625 return 0;
626
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700627 switch (action) {
628 case BUS_NOTIFY_ADD_DEVICE:
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700629 /* if the family driver needs to initialize something... */
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700630 if (fops->add_slave) {
631 err = fops->add_slave(sl);
632 if (err < 0) {
633 dev_err(&sl->dev,
634 "add_slave() call failed. err=%d\n",
635 err);
636 return err;
637 }
638 }
639 if (fops->groups) {
640 err = sysfs_create_groups(&sl->dev.kobj, fops->groups);
641 if (err) {
642 dev_err(&sl->dev,
643 "sysfs group creation failed. err=%d\n",
644 err);
645 return err;
646 }
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700647 }
648
649 break;
650 case BUS_NOTIFY_DEL_DEVICE:
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700651 if (fops->remove_slave)
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700652 sl->family->fops->remove_slave(sl);
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700653 if (fops->groups)
654 sysfs_remove_groups(&sl->dev.kobj, fops->groups);
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700655 break;
656 }
657 return 0;
658}
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660static int __w1_attach_slave_device(struct w1_slave *sl)
661{
662 int err;
663
664 sl->dev.parent = &sl->master->dev;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400665 sl->dev.driver = &w1_slave_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 sl->dev.bus = &w1_bus_type;
667 sl->dev.release = &w1_slave_release;
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700668 sl->dev.groups = w1_slave_groups;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Kay Sievers40f91de2009-01-06 10:44:34 -0800670 dev_set_name(&sl->dev, "%02x-%012llx",
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400671 (unsigned int) sl->reg_num.family,
672 (unsigned long long) sl->reg_num.id);
673 snprintf(&sl->name[0], sizeof(sl->name),
674 "%02x-%012llx",
675 (unsigned int) sl->reg_num.family,
676 (unsigned long long) sl->reg_num.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Andrew Mortonc6976a42006-05-14 21:43:50 -0700678 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
Kay Sievers40f91de2009-01-06 10:44:34 -0800679 dev_name(&sl->dev), sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
David Fries18d7f892014-04-16 01:21:21 -0500681 /* suppress for w1_family_notify before sending KOBJ_ADD */
682 dev_set_uevent_suppress(&sl->dev, true);
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 err = device_register(&sl->dev);
685 if (err < 0) {
686 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400687 "Device registration [%s] failed. err=%d\n",
Kay Sievers40f91de2009-01-06 10:44:34 -0800688 dev_name(&sl->dev), err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 return err;
690 }
David Fries18d7f892014-04-16 01:21:21 -0500691 w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700693 dev_set_uevent_suppress(&sl->dev, false);
694 kobject_uevent(&sl->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
David Fries9fcbbac2014-01-15 22:29:18 -0600696 mutex_lock(&sl->master->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
David Fries9fcbbac2014-01-15 22:29:18 -0600698 mutex_unlock(&sl->master->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 return 0;
701}
702
David Fries70b34d22014-01-15 22:29:17 -0600703int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
705 struct w1_slave *sl;
706 struct w1_family *f;
707 int err;
708 struct w1_netlink_msg msg;
709
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700710 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (!sl) {
712 dev_err(&dev->dev,
713 "%s: failed to allocate new slave device.\n",
714 __func__);
715 return -ENOMEM;
716 }
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
719 sl->owner = THIS_MODULE;
720 sl->master = dev;
Michal Nazarewiczbb670932013-11-12 15:11:42 -0800721 set_bit(W1_SLAVE_ACTIVE, &sl->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300723 memset(&msg, 0, sizeof(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
David Fries9fcbbac2014-01-15 22:29:18 -0600725 atomic_set(&sl->refcnt, 1);
726 atomic_inc(&sl->master->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Hans-Frieder Vogtbc04d762013-10-06 21:13:40 +0200728 /* slave modules need to be loaded in a context with unlocked mutex */
729 mutex_unlock(&dev->mutex);
Alexander Stein8d7bda52013-05-26 20:06:50 +0200730 request_module("w1-family-0x%0x", rn->family);
Hans-Frieder Vogtbc04d762013-10-06 21:13:40 +0200731 mutex_lock(&dev->mutex);
Alexander Stein8d7bda52013-05-26 20:06:50 +0200732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 spin_lock(&w1_flock);
734 f = w1_family_registered(rn->family);
735 if (!f) {
Evgeniy Polyakov99c5bfe2005-06-04 01:31:26 +0400736 f= &w1_default_family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
738 rn->family, rn->family,
739 (unsigned long long)rn->id, rn->crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 }
741 __w1_family_get(f);
742 spin_unlock(&w1_flock);
743
744 sl->family = f;
745
746
747 err = __w1_attach_slave_device(sl);
748 if (err < 0) {
749 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
750 sl->name);
751 w1_family_put(sl->family);
752 kfree(sl);
753 return err;
754 }
755
756 sl->ttl = dev->slave_ttl;
757 dev->slave_count++;
758
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300759 memcpy(msg.id.id, rn, sizeof(msg.id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 msg.type = W1_SLAVE_ADD;
761 w1_netlink_send(dev, &msg);
762
763 return 0;
764}
765
David Fries9fcbbac2014-01-15 22:29:18 -0600766int w1_unref_slave(struct w1_slave *sl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
David Fries9fcbbac2014-01-15 22:29:18 -0600768 struct w1_master *dev = sl->master;
769 int refcnt;
770 mutex_lock(&dev->list_mutex);
771 refcnt = atomic_sub_return(1, &sl->refcnt);
772 if (refcnt == 0) {
773 struct w1_netlink_msg msg;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400774
David Fries9fcbbac2014-01-15 22:29:18 -0600775 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__,
776 sl->name, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
David Fries9fcbbac2014-01-15 22:29:18 -0600778 list_del(&sl->w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
David Fries9fcbbac2014-01-15 22:29:18 -0600780 memset(&msg, 0, sizeof(msg));
781 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
782 msg.type = W1_SLAVE_REMOVE;
783 w1_netlink_send(sl->master, &msg);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400784
David Fries18d7f892014-04-16 01:21:21 -0500785 w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl);
David Fries9fcbbac2014-01-15 22:29:18 -0600786 device_unregister(&sl->dev);
787 #ifdef DEBUG
788 memset(sl, 0, sizeof(*sl));
789 #endif
790 kfree(sl);
791 }
792 atomic_dec(&dev->refcnt);
793 mutex_unlock(&dev->list_mutex);
794 return refcnt;
795}
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400796
David Fries9fcbbac2014-01-15 22:29:18 -0600797int w1_slave_detach(struct w1_slave *sl)
798{
799 /* Only detach a slave once as it decreases the refcnt each time. */
800 int destroy_now;
801 mutex_lock(&sl->master->list_mutex);
802 destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags);
803 set_bit(W1_SLAVE_DETACH, &sl->flags);
804 mutex_unlock(&sl->master->list_mutex);
805
806 if (destroy_now)
807 destroy_now = !w1_unref_slave(sl);
808 return destroy_now ? 0 : -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809}
810
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300811struct w1_master *w1_search_master_id(u32 id)
812{
813 struct w1_master *dev;
814 int found = 0;
815
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400816 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300817 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
818 if (dev->id == id) {
819 found = 1;
820 atomic_inc(&dev->refcnt);
821 break;
822 }
823 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400824 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300825
826 return (found)?dev:NULL;
827}
828
829struct w1_slave *w1_search_slave(struct w1_reg_num *id)
830{
831 struct w1_master *dev;
832 struct w1_slave *sl = NULL;
833 int found = 0;
834
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400835 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300836 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
David Fries9fcbbac2014-01-15 22:29:18 -0600837 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300838 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
839 if (sl->reg_num.family == id->family &&
840 sl->reg_num.id == id->id &&
841 sl->reg_num.crc == id->crc) {
842 found = 1;
843 atomic_inc(&dev->refcnt);
844 atomic_inc(&sl->refcnt);
845 break;
846 }
847 }
David Fries9fcbbac2014-01-15 22:29:18 -0600848 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300849
850 if (found)
851 break;
852 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400853 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300854
855 return (found)?sl:NULL;
856}
857
David Friesc30c9b12008-10-15 22:04:38 -0700858void w1_reconnect_slaves(struct w1_family *f, int attach)
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400859{
David Friesc30c9b12008-10-15 22:04:38 -0700860 struct w1_slave *sl, *sln;
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400861 struct w1_master *dev;
862
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400863 mutex_lock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400864 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
David Friesc30c9b12008-10-15 22:04:38 -0700865 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
866 "for family %02x.\n", dev->name, f->fid);
867 mutex_lock(&dev->mutex);
David Fries9fcbbac2014-01-15 22:29:18 -0600868 mutex_lock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700869 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
870 /* If it is a new family, slaves with the default
871 * family driver and are that family will be
872 * connected. If the family is going away, devices
873 * matching that family are reconneced.
874 */
875 if ((attach && sl->family->fid == W1_FAMILY_DEFAULT
876 && sl->reg_num.family == f->fid) ||
877 (!attach && sl->family->fid == f->fid)) {
878 struct w1_reg_num rn;
879
David Fries9fcbbac2014-01-15 22:29:18 -0600880 mutex_unlock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700881 memcpy(&rn, &sl->reg_num, sizeof(rn));
David Fries9fcbbac2014-01-15 22:29:18 -0600882 /* If it was already in use let the automatic
883 * scan pick it up again later.
884 */
885 if (!w1_slave_detach(sl))
886 w1_attach_slave_device(dev, &rn);
887 mutex_lock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700888 }
889 }
890 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
891 "has been finished.\n", dev->name);
David Fries9fcbbac2014-01-15 22:29:18 -0600892 mutex_unlock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700893 mutex_unlock(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400894 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400895 mutex_unlock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400896}
897
David Fries963bb102011-05-26 16:26:03 -0700898void w1_slave_found(struct w1_master *dev, u64 rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 struct w1_slave *sl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 struct w1_reg_num *tmp;
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400902 u64 rn_le = cpu_to_le64(rn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
David Friesc30c9b12008-10-15 22:04:38 -0700904 atomic_inc(&dev->refcnt);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 tmp = (struct w1_reg_num *) &rn;
907
David Friescd7b28d2008-10-15 22:04:44 -0700908 sl = w1_slave_search_device(dev, tmp);
909 if (sl) {
Michal Nazarewiczbb670932013-11-12 15:11:42 -0800910 set_bit(W1_SLAVE_ACTIVE, &sl->flags);
David Friescd7b28d2008-10-15 22:04:44 -0700911 } else {
912 if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7))
913 w1_attach_slave_device(dev, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 atomic_dec(&dev->refcnt);
917}
918
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400919/**
David Friesb3be1772014-01-15 22:29:25 -0600920 * w1_search() - Performs a ROM Search & registers any devices found.
921 * @dev: The master device to search
922 * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH
923 * to return only devices in the alarmed state
924 * @cb: Function to call when a device is found
925 *
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400926 * The 1-wire search is a simple binary tree search.
927 * For each bit of the address, we read two bits and write one bit.
928 * The bit written will put to sleep all devies that don't match that bit.
929 * When the two reads differ, the direction choice is obvious.
930 * When both bits are 0, we must choose a path to take.
931 * When we can scan all 64 bits without having to choose a path, we are done.
932 *
933 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
934 *
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400935 */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300936void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400938 u64 last_rn, rn, tmp64;
939 int i, slave_count = 0;
940 int last_zero, last_device;
941 int search_bit, desc_bit;
942 u8 triplet_ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400944 search_bit = 0;
David Fries3c6955e2014-01-15 22:29:16 -0600945 rn = dev->search_id;
946 last_rn = 0;
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400947 last_device = 0;
948 last_zero = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 desc_bit = 64;
951
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400952 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
953 last_rn = rn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 rn = 0;
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 /*
957 * Reset bus and all 1-wire device state machines
958 * so they can respond to our requests.
959 *
960 * Return 0 - device(s) present, 1 - no devices present.
961 */
NeilBrownb02f8be2012-05-18 15:59:52 +1000962 mutex_lock(&dev->bus_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (w1_reset_bus(dev)) {
NeilBrownb02f8be2012-05-18 15:59:52 +1000964 mutex_unlock(&dev->bus_mutex);
Evgeniy Polyakov2da5bf82005-08-12 11:46:22 -0700965 dev_dbg(&dev->dev, "No devices present on the wire.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 break;
967 }
968
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300969 /* Do fast search on single slave bus */
970 if (dev->max_slave_count == 1) {
NeilBrownb02f8be2012-05-18 15:59:52 +1000971 int rv;
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300972 w1_write_8(dev, W1_READ_ROM);
NeilBrownb02f8be2012-05-18 15:59:52 +1000973 rv = w1_read_block(dev, (u8 *)&rn, 8);
974 mutex_unlock(&dev->bus_mutex);
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300975
NeilBrownb02f8be2012-05-18 15:59:52 +1000976 if (rv == 8 && rn)
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300977 cb(dev, rn);
978
979 break;
980 }
981
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400982 /* Start the search */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300983 w1_write_8(dev, search_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 for (i = 0; i < 64; ++i) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400985 /* Determine the direction/search bit */
986 if (i == desc_bit)
987 search_bit = 1; /* took the 0 path last time, so take the 1 path */
988 else if (i > desc_bit)
989 search_bit = 0; /* take the 0 path on the next branch */
990 else
991 search_bit = ((last_rn >> i) & 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
David Friesb3be1772014-01-15 22:29:25 -0600993 /* Read two bits and write one bit */
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400994 triplet_ret = w1_triplet(dev, search_bit);
995
996 /* quit if no device responded */
997 if ( (triplet_ret & 0x03) == 0x03 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 break;
999
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001000 /* If both directions were valid, and we took the 0 path... */
1001 if (triplet_ret == 0)
1002 last_zero = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001004 /* extract the direction taken & update the device number */
1005 tmp64 = (triplet_ret >> 2);
1006 rn |= (tmp64 << i);
David Fries0d671b22008-10-15 22:04:39 -07001007
David Fries42105692014-01-15 22:29:13 -06001008 if (test_bit(W1_ABORT_SEARCH, &dev->flags)) {
NeilBrownb02f8be2012-05-18 15:59:52 +10001009 mutex_unlock(&dev->bus_mutex);
David Fries7dc8f522008-10-15 22:04:58 -07001010 dev_dbg(&dev->dev, "Abort w1_search\n");
David Fries0d671b22008-10-15 22:04:39 -07001011 return;
1012 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 }
NeilBrownb02f8be2012-05-18 15:59:52 +10001014 mutex_unlock(&dev->bus_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001016 if ( (triplet_ret & 0x03) != 0x03 ) {
David Fries3c6955e2014-01-15 22:29:16 -06001017 if ((desc_bit == last_zero) || (last_zero < 0)) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001018 last_device = 1;
David Fries3c6955e2014-01-15 22:29:16 -06001019 dev->search_id = 0;
1020 } else {
1021 dev->search_id = rn;
1022 }
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001023 desc_bit = last_zero;
David Friesc30c9b12008-10-15 22:04:38 -07001024 cb(dev, rn);
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001025 }
David Friesa1613052014-01-15 22:29:15 -06001026
1027 if (!last_device && slave_count == dev->max_slave_count &&
1028 !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) {
David Fries3c6955e2014-01-15 22:29:16 -06001029 /* Only max_slave_count will be scanned in a search,
1030 * but it will start where it left off next search
1031 * until all ids are identified and then it will start
1032 * over. A continued search will report the previous
1033 * last id as the first id (provided it is still on the
1034 * bus).
1035 */
David Friesa1613052014-01-15 22:29:15 -06001036 dev_info(&dev->dev, "%s: max_slave_count %d reached, "
David Fries3c6955e2014-01-15 22:29:16 -06001037 "will continue next search.\n", __func__,
David Friesa1613052014-01-15 22:29:15 -06001038 dev->max_slave_count);
1039 set_bit(W1_WARN_MAX_COUNT, &dev->flags);
1040 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 }
1042}
1043
David Fries963bb102011-05-26 16:26:03 -07001044void w1_search_process_cb(struct w1_master *dev, u8 search_type,
1045 w1_slave_found_callback cb)
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001046{
1047 struct w1_slave *sl, *sln;
1048
David Fries9fcbbac2014-01-15 22:29:18 -06001049 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001050 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
Michal Nazarewiczbb670932013-11-12 15:11:42 -08001051 clear_bit(W1_SLAVE_ACTIVE, &sl->flags);
David Fries9fcbbac2014-01-15 22:29:18 -06001052 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001053
David Fries963bb102011-05-26 16:26:03 -07001054 w1_search_devices(dev, search_type, cb);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001055
David Fries9fcbbac2014-01-15 22:29:18 -06001056 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001057 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
David Fries9fcbbac2014-01-15 22:29:18 -06001058 if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) {
1059 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001060 w1_slave_detach(sl);
David Fries9fcbbac2014-01-15 22:29:18 -06001061 mutex_lock(&dev->list_mutex);
1062 }
Michal Nazarewiczbb670932013-11-12 15:11:42 -08001063 else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags))
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001064 sl->ttl = dev->slave_ttl;
1065 }
David Fries9fcbbac2014-01-15 22:29:18 -06001066 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001067
1068 if (dev->search_count > 0)
1069 dev->search_count--;
1070}
1071
David Fries963bb102011-05-26 16:26:03 -07001072static void w1_search_process(struct w1_master *dev, u8 search_type)
1073{
1074 w1_search_process_cb(dev, search_type, w1_slave_found);
1075}
1076
David Friesb3be1772014-01-15 22:29:25 -06001077/**
1078 * w1_process_callbacks() - execute each dev->async_list callback entry
1079 * @dev: w1_master device
1080 *
Alexey Khoroshilova0f10462014-05-07 01:26:04 +04001081 * The w1 master list_mutex must be held.
1082 *
David Friesb3be1772014-01-15 22:29:25 -06001083 * Return: 1 if there were commands to executed 0 otherwise
1084 */
David Fries9fcbbac2014-01-15 22:29:18 -06001085int w1_process_callbacks(struct w1_master *dev)
1086{
1087 int ret = 0;
1088 struct w1_async_cmd *async_cmd, *async_n;
1089
1090 /* The list can be added to in another thread, loop until it is empty */
1091 while (!list_empty(&dev->async_list)) {
1092 list_for_each_entry_safe(async_cmd, async_n, &dev->async_list,
1093 async_entry) {
1094 /* drop the lock, if it is a search it can take a long
1095 * time */
1096 mutex_unlock(&dev->list_mutex);
1097 async_cmd->cb(dev, async_cmd);
1098 ret = 1;
1099 mutex_lock(&dev->list_mutex);
1100 }
1101 }
1102 return ret;
1103}
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105int w1_process(void *data)
1106{
1107 struct w1_master *dev = (struct w1_master *) data;
David Fries3c52e4e2008-10-15 22:04:41 -07001108 /* As long as w1_timeout is only set by a module parameter the sleep
1109 * time can be calculated in jiffies once.
1110 */
1111 const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
David Fries9fcbbac2014-01-15 22:29:18 -06001112 /* remainder if it woke up early */
1113 unsigned long jremain = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
David Fries9fcbbac2014-01-15 22:29:18 -06001115 for (;;) {
1116
1117 if (!jremain && dev->search_count) {
David Fries01e14d62008-10-15 22:04:40 -07001118 mutex_lock(&dev->mutex);
1119 w1_search_process(dev, W1_SEARCH);
1120 mutex_unlock(&dev->mutex);
1121 }
1122
David Fries9fcbbac2014-01-15 22:29:18 -06001123 mutex_lock(&dev->list_mutex);
1124 /* Note, w1_process_callback drops the lock while processing,
1125 * but locks it again before returning.
1126 */
1127 if (!w1_process_callbacks(dev) && jremain) {
1128 /* a wake up is either to stop the thread, process
1129 * callbacks, or search, it isn't process callbacks, so
1130 * schedule a search.
1131 */
1132 jremain = 1;
1133 }
1134
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07001135 try_to_freeze();
David Fries3c52e4e2008-10-15 22:04:41 -07001136 __set_current_state(TASK_INTERRUPTIBLE);
1137
David Fries9fcbbac2014-01-15 22:29:18 -06001138 /* hold list_mutex until after interruptible to prevent loosing
1139 * the wakeup signal when async_cmd is added.
1140 */
1141 mutex_unlock(&dev->list_mutex);
1142
David Fries3c52e4e2008-10-15 22:04:41 -07001143 if (kthread_should_stop())
1144 break;
1145
1146 /* Only sleep when the search is active. */
David Fries9fcbbac2014-01-15 22:29:18 -06001147 if (dev->search_count) {
1148 if (!jremain)
1149 jremain = jtime;
1150 jremain = schedule_timeout(jremain);
1151 }
David Fries3c52e4e2008-10-15 22:04:41 -07001152 else
1153 schedule();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 }
1155
1156 atomic_dec(&dev->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 return 0;
1159}
1160
Peter Huewe73a98fc2009-12-22 09:38:02 +01001161static int __init w1_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162{
1163 int retval;
1164
1165 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
1166
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001167 w1_init_netlink();
1168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 retval = bus_register(&w1_bus_type);
1170 if (retval) {
1171 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
1172 goto err_out_exit_init;
1173 }
1174
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001175 retval = driver_register(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 if (retval) {
1177 printk(KERN_ERR
1178 "Failed to register master driver. err=%d.\n",
1179 retval);
1180 goto err_out_bus_unregister;
1181 }
1182
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001183 retval = driver_register(&w1_slave_driver);
1184 if (retval) {
1185 printk(KERN_ERR
Dmitry Artamonowecf19482012-04-02 09:42:22 +04001186 "Failed to register slave driver. err=%d.\n",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001187 retval);
1188 goto err_out_master_unregister;
1189 }
1190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 return 0;
1192
David Friesc30c9b12008-10-15 22:04:38 -07001193#if 0
1194/* For undoing the slave register if there was a step after it. */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001195err_out_slave_unregister:
1196 driver_unregister(&w1_slave_driver);
David Friesc30c9b12008-10-15 22:04:38 -07001197#endif
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001198
1199err_out_master_unregister:
1200 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
1202err_out_bus_unregister:
1203 bus_unregister(&w1_bus_type);
1204
1205err_out_exit_init:
1206 return retval;
1207}
1208
Peter Huewe73a98fc2009-12-22 09:38:02 +01001209static void __exit w1_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210{
1211 struct w1_master *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
David Friesc30c9b12008-10-15 22:04:38 -07001213 /* Set netlink removal messages and some cleanup */
Evgeniy Polyakov77859252005-05-20 22:33:25 +04001214 list_for_each_entry(dev, &w1_masters, w1_master_entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 __w1_remove_master_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001217 w1_fini_netlink();
1218
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001219 driver_unregister(&w1_slave_driver);
1220 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 bus_unregister(&w1_bus_type);
1222}
1223
1224module_init(w1_init);
1225module_exit(w1_fini);