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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 *
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;
Dmitry Khromovc3098352015-05-12 22:29:44 +030049static int w1_timeout_us = 0;
David Friesa1613052014-01-15 22:29:15 -060050int w1_max_slave_count = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051int w1_max_slave_ttl = 10;
52
53module_param_named(timeout, w1_timeout, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060054MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches");
Dmitry Khromovc3098352015-05-12 22:29:44 +030055module_param_named(timeout_us, w1_timeout_us, int, 0);
Wei Yongjuna46b1952016-08-08 13:52:41 +000056MODULE_PARM_DESC(timeout_us,
57 "time in microseconds between automatic slave searches");
David Friesb3be1772014-01-15 22:29:25 -060058/* A search stops when w1_max_slave_count devices have been found in that
59 * search. The next search will start over and detect the same set of devices
60 * on a static 1-wire bus. Memory is not allocated based on this number, just
61 * on the number of devices known to the kernel. Having a high number does not
62 * consume additional resources. As a special case, if there is only one
63 * device on the network and w1_max_slave_count is set to 1, the device id can
64 * be read directly skipping the normal slower search process.
65 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070066module_param_named(max_slave_count, w1_max_slave_count, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060067MODULE_PARM_DESC(max_slave_count,
68 "maximum number of slaves detected in a search");
Linus Torvalds1da177e2005-04-16 15:20:36 -070069module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
David Friesb3be1772014-01-15 22:29:25 -060070MODULE_PARM_DESC(slave_ttl,
71 "Number of searches not seeing a slave before it will be removed");
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +040073DEFINE_MUTEX(w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074LIST_HEAD(w1_masters);
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static int w1_master_match(struct device *dev, struct device_driver *drv)
77{
78 return 1;
79}
80
81static int w1_master_probe(struct device *dev)
82{
83 return -ENODEV;
84}
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static void w1_master_release(struct device *dev)
87{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040088 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040089
90 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040091 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
92 kfree(md);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95static void w1_slave_release(struct device *dev)
96{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040097 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040098
David Fries9fcbbac2014-01-15 22:29:18 -060099 dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400100
101 w1_family_put(sl->family);
102 sl->master->slave_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700105static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400107 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400108
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400109 return sprintf(buf, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700111static DEVICE_ATTR_RO(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700113static ssize_t id_show(struct device *dev,
David Fries07e00342008-10-15 22:04:50 -0700114 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
David Fries07e00342008-10-15 22:04:50 -0700116 struct w1_slave *sl = dev_to_w1_slave(dev);
117 ssize_t count = sizeof(sl->reg_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
David Fries07e00342008-10-15 22:04:50 -0700119 memcpy(buf, (u8 *)&sl->reg_num, count);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400120 return count;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400121}
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700122static DEVICE_ATTR_RO(id);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400123
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700124static struct attribute *w1_slave_attrs[] = {
125 &dev_attr_name.attr,
126 &dev_attr_id.attr,
127 NULL,
128};
129ATTRIBUTE_GROUPS(w1_slave);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400130
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400131/* Default family */
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300132
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700133static ssize_t rw_write(struct file *filp, struct kobject *kobj,
134 struct bin_attribute *bin_attr, char *buf, loff_t off,
135 size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300136{
137 struct w1_slave *sl = kobj_to_w1_slave(kobj);
138
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400139 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300140 if (w1_reset_select_slave(sl)) {
141 count = 0;
142 goto out_up;
143 }
144
145 w1_write_block(sl->master, buf, count);
146
147out_up:
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400148 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300149 return count;
150}
151
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700152static ssize_t rw_read(struct file *filp, struct kobject *kobj,
153 struct bin_attribute *bin_attr, char *buf, loff_t off,
154 size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300155{
156 struct w1_slave *sl = kobj_to_w1_slave(kobj);
157
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400158 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300159 w1_read_block(sl->master, buf, count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400160 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300161 return count;
162}
163
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700164static BIN_ATTR_RW(rw, PAGE_SIZE);
165
166static struct bin_attribute *w1_slave_bin_attrs[] = {
167 &bin_attr_rw,
168 NULL,
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300169};
170
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700171static const struct attribute_group w1_slave_default_group = {
172 .bin_attrs = w1_slave_bin_attrs,
173};
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300174
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700175static const struct attribute_group *w1_slave_default_groups[] = {
176 &w1_slave_default_group,
177 NULL,
178};
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300179
180static struct w1_family_ops w1_default_fops = {
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700181 .groups = w1_slave_default_groups,
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300182};
183
184static struct w1_family w1_default_family = {
185 .fops = &w1_default_fops,
186};
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400187
Kay Sievers7eff2e72007-08-14 15:15:12 +0200188static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190static struct bus_type w1_bus_type = {
191 .name = "w1",
192 .match = w1_master_match,
Kay Sievers312c0042005-11-16 09:00:00 +0100193 .uevent = w1_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194};
195
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400196struct device_driver w1_master_driver = {
197 .name = "w1_master_driver",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 .bus = &w1_bus_type,
199 .probe = w1_master_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200};
201
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400202struct device w1_master_device = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 .parent = NULL,
204 .bus = &w1_bus_type,
Kay Sievers40f91de2009-01-06 10:44:34 -0800205 .init_name = "w1 bus master",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400206 .driver = &w1_master_driver,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 .release = &w1_master_release
208};
209
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400210static struct device_driver w1_slave_driver = {
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400211 .name = "w1_slave_driver",
212 .bus = &w1_bus_type,
213};
214
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400215#if 0
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400216struct device w1_slave_device = {
217 .parent = NULL,
218 .bus = &w1_bus_type,
Kay Sievers40f91de2009-01-06 10:44:34 -0800219 .init_name = "w1 bus slave",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400220 .driver = &w1_slave_driver,
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400221 .release = &w1_slave_release
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400222};
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400223#endif /* 0 */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400224
Yani Ioannou060b8842005-05-17 06:44:04 -0400225static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400227 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400229
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400230 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 count = sprintf(buf, "%s\n", md->name);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400232 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 return count;
235}
236
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400237static ssize_t w1_master_attribute_store_search(struct device * dev,
238 struct device_attribute *attr,
239 const char * buf, size_t count)
240{
David Fries6a158c02008-10-15 22:04:42 -0700241 long tmp;
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400242 struct w1_master *md = dev_to_w1_master(dev);
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700243 int ret;
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400244
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700245 ret = kstrtol(buf, 0, &tmp);
246 if (ret)
247 return ret;
David Fries6a158c02008-10-15 22:04:42 -0700248
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400249 mutex_lock(&md->mutex);
David Fries6a158c02008-10-15 22:04:42 -0700250 md->search_count = tmp;
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400251 mutex_unlock(&md->mutex);
David Friesaf8c7232014-01-15 22:29:14 -0600252 /* Only wake if it is going to be searching. */
253 if (tmp)
254 wake_up_process(md->thread);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400255
256 return count;
257}
258
259static ssize_t w1_master_attribute_show_search(struct device *dev,
260 struct device_attribute *attr,
261 char *buf)
262{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400263 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400264 ssize_t count;
265
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400266 mutex_lock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400267 count = sprintf(buf, "%d\n", md->search_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400268 mutex_unlock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400269
270 return count;
271}
272
David Fries6a158c02008-10-15 22:04:42 -0700273static ssize_t w1_master_attribute_store_pullup(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
276{
277 long tmp;
278 struct w1_master *md = dev_to_w1_master(dev);
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700279 int ret;
David Fries6a158c02008-10-15 22:04:42 -0700280
Jingoo Hanbf4228f2013-09-11 14:26:03 -0700281 ret = kstrtol(buf, 0, &tmp);
282 if (ret)
283 return ret;
David Fries6a158c02008-10-15 22:04:42 -0700284
285 mutex_lock(&md->mutex);
286 md->enable_pullup = tmp;
287 mutex_unlock(&md->mutex);
David Fries6a158c02008-10-15 22:04:42 -0700288
289 return count;
290}
291
292static ssize_t w1_master_attribute_show_pullup(struct device *dev,
293 struct device_attribute *attr,
294 char *buf)
295{
296 struct w1_master *md = dev_to_w1_master(dev);
297 ssize_t count;
298
299 mutex_lock(&md->mutex);
300 count = sprintf(buf, "%d\n", md->enable_pullup);
301 mutex_unlock(&md->mutex);
302
303 return count;
304}
305
Yani Ioannou060b8842005-05-17 06:44:04 -0400306static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400308 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400310
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400311 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 count = sprintf(buf, "0x%p\n", md->bus_master);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400313 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return count;
315}
316
Yani Ioannou060b8842005-05-17 06:44:04 -0400317static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 ssize_t count;
320 count = sprintf(buf, "%d\n", w1_timeout);
321 return count;
322}
323
Dmitry Khromovc3098352015-05-12 22:29:44 +0300324static ssize_t w1_master_attribute_show_timeout_us(struct device *dev,
325 struct device_attribute *attr, char *buf)
326{
327 ssize_t count;
328 count = sprintf(buf, "%d\n", w1_timeout_us);
329 return count;
330}
331
David Friesa1613052014-01-15 22:29:15 -0600332static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
333 struct device_attribute *attr, const char *buf, size_t count)
334{
Dan Carpentera7155f42014-02-12 00:07:55 +0300335 int tmp;
David Friesa1613052014-01-15 22:29:15 -0600336 struct w1_master *md = dev_to_w1_master(dev);
337
Dan Carpenterb9c11a22016-04-14 12:35:48 +0300338 if (kstrtoint(buf, 0, &tmp) || tmp < 1)
David Friesa1613052014-01-15 22:29:15 -0600339 return -EINVAL;
340
341 mutex_lock(&md->mutex);
342 md->max_slave_count = tmp;
343 /* allow each time the max_slave_count is updated */
344 clear_bit(W1_WARN_MAX_COUNT, &md->flags);
345 mutex_unlock(&md->mutex);
346
347 return count;
348}
349
Yani Ioannou060b8842005-05-17 06:44:04 -0400350static 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 -0700351{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400352 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400354
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400355 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 count = sprintf(buf, "%d\n", md->max_slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400357 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return count;
359}
360
Yani Ioannou060b8842005-05-17 06:44:04 -0400361static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400363 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400365
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400366 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 count = sprintf(buf, "%lu\n", md->attempts);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400368 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return count;
370}
371
Yani Ioannou060b8842005-05-17 06:44:04 -0400372static ssize_t w1_master_attribute_show_slave_count(struct device *dev, 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 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400376
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400377 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 count = sprintf(buf, "%d\n", md->slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400379 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return count;
381}
382
David Fries9b467412008-10-15 22:04:43 -0700383static ssize_t w1_master_attribute_show_slaves(struct device *dev,
384 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400386 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 int c = PAGE_SIZE;
David Fries9fcbbac2014-01-15 22:29:18 -0600388 struct list_head *ent, *n;
389 struct w1_slave *sl = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
David Fries9fcbbac2014-01-15 22:29:18 -0600391 mutex_lock(&md->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
David Fries9fcbbac2014-01-15 22:29:18 -0600393 list_for_each_safe(ent, n, &md->slist) {
394 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
David Fries9fcbbac2014-01-15 22:29:18 -0600396 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
David Fries9fcbbac2014-01-15 22:29:18 -0600398 if (!sl)
399 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
David Fries9fcbbac2014-01-15 22:29:18 -0600401 mutex_unlock(&md->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 return PAGE_SIZE - c;
404}
405
David Fries9b467412008-10-15 22:04:43 -0700406static ssize_t w1_master_attribute_show_add(struct device *dev,
407 struct device_attribute *attr, char *buf)
408{
409 int c = PAGE_SIZE;
410 c -= snprintf(buf+PAGE_SIZE - c, c,
411 "write device id xx-xxxxxxxxxxxx to add slave\n");
412 return PAGE_SIZE - c;
413}
414
415static int w1_atoreg_num(struct device *dev, const char *buf, size_t count,
416 struct w1_reg_num *rn)
417{
418 unsigned int family;
419 unsigned long long id;
420 int i;
421 u64 rn64_le;
422
423 /* The CRC value isn't read from the user because the sysfs directory
424 * doesn't include it and most messages from the bus search don't
425 * print it either. It would be unreasonable for the user to then
426 * provide it.
427 */
428 const char *error_msg = "bad slave string format, expecting "
429 "ff-dddddddddddd\n";
430
431 if (buf[2] != '-') {
432 dev_err(dev, "%s", error_msg);
433 return -EINVAL;
434 }
435 i = sscanf(buf, "%02x-%012llx", &family, &id);
436 if (i != 2) {
437 dev_err(dev, "%s", error_msg);
438 return -EINVAL;
439 }
440 rn->family = family;
441 rn->id = id;
442
443 rn64_le = cpu_to_le64(*(u64 *)rn);
444 rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7);
445
446#if 0
447 dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n",
448 rn->family, (unsigned long long)rn->id, rn->crc);
449#endif
450
451 return 0;
452}
453
454/* Searches the slaves in the w1_master and returns a pointer or NULL.
David Fries9fcbbac2014-01-15 22:29:18 -0600455 * Note: must not hold list_mutex
David Fries9b467412008-10-15 22:04:43 -0700456 */
David Fries70b34d22014-01-15 22:29:17 -0600457struct w1_slave *w1_slave_search_device(struct w1_master *dev,
David Fries9b467412008-10-15 22:04:43 -0700458 struct w1_reg_num *rn)
459{
460 struct w1_slave *sl;
David Fries9fcbbac2014-01-15 22:29:18 -0600461 mutex_lock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700462 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
463 if (sl->reg_num.family == rn->family &&
464 sl->reg_num.id == rn->id &&
465 sl->reg_num.crc == rn->crc) {
David Fries9fcbbac2014-01-15 22:29:18 -0600466 mutex_unlock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700467 return sl;
468 }
469 }
David Fries9fcbbac2014-01-15 22:29:18 -0600470 mutex_unlock(&dev->list_mutex);
David Fries9b467412008-10-15 22:04:43 -0700471 return NULL;
472}
473
474static ssize_t w1_master_attribute_store_add(struct device *dev,
475 struct device_attribute *attr,
476 const char *buf, size_t count)
477{
478 struct w1_master *md = dev_to_w1_master(dev);
479 struct w1_reg_num rn;
480 struct w1_slave *sl;
481 ssize_t result = count;
482
483 if (w1_atoreg_num(dev, buf, count, &rn))
484 return -EINVAL;
485
486 mutex_lock(&md->mutex);
487 sl = w1_slave_search_device(md, &rn);
488 /* It would be nice to do a targeted search one the one-wire bus
489 * for the new device to see if it is out there or not. But the
490 * current search doesn't support that.
491 */
492 if (sl) {
493 dev_info(dev, "Device %s already exists\n", sl->name);
494 result = -EINVAL;
495 } else {
496 w1_attach_slave_device(md, &rn);
497 }
498 mutex_unlock(&md->mutex);
499
500 return result;
501}
502
503static ssize_t w1_master_attribute_show_remove(struct device *dev,
504 struct device_attribute *attr, char *buf)
505{
506 int c = PAGE_SIZE;
507 c -= snprintf(buf+PAGE_SIZE - c, c,
508 "write device id xx-xxxxxxxxxxxx to remove slave\n");
509 return PAGE_SIZE - c;
510}
511
512static ssize_t w1_master_attribute_store_remove(struct device *dev,
513 struct device_attribute *attr,
514 const char *buf, size_t count)
515{
516 struct w1_master *md = dev_to_w1_master(dev);
517 struct w1_reg_num rn;
518 struct w1_slave *sl;
519 ssize_t result = count;
520
521 if (w1_atoreg_num(dev, buf, count, &rn))
522 return -EINVAL;
523
524 mutex_lock(&md->mutex);
525 sl = w1_slave_search_device(md, &rn);
526 if (sl) {
David Fries9fcbbac2014-01-15 22:29:18 -0600527 result = w1_slave_detach(sl);
528 /* refcnt 0 means it was detached in the call */
529 if (result == 0)
530 result = count;
David Fries9b467412008-10-15 22:04:43 -0700531 } else {
532 dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family,
533 (unsigned long long)rn.id);
534 result = -EINVAL;
535 }
536 mutex_unlock(&md->mutex);
537
538 return result;
539}
540
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400541#define W1_MASTER_ATTR_RO(_name, _mode) \
542 struct device_attribute w1_master_attribute_##_name = \
543 __ATTR(w1_master_##_name, _mode, \
544 w1_master_attribute_show_##_name, NULL)
545
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400546#define W1_MASTER_ATTR_RW(_name, _mode) \
547 struct device_attribute w1_master_attribute_##_name = \
548 __ATTR(w1_master_##_name, _mode, \
549 w1_master_attribute_show_##_name, \
550 w1_master_attribute_store_##_name)
551
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400552static W1_MASTER_ATTR_RO(name, S_IRUGO);
553static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
554static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
David Friesa1613052014-01-15 22:29:15 -0600555static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400556static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
557static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
Dmitry Khromovc3098352015-05-12 22:29:44 +0300558static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400559static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
Brian Swetland12aa4c62010-10-27 15:34:49 -0700560static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP);
561static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP);
562static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP);
563static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400564
565static struct attribute *w1_master_default_attrs[] = {
566 &w1_master_attribute_name.attr,
567 &w1_master_attribute_slaves.attr,
568 &w1_master_attribute_slave_count.attr,
569 &w1_master_attribute_max_slave_count.attr,
570 &w1_master_attribute_attempts.attr,
571 &w1_master_attribute_timeout.attr,
Dmitry Khromovc3098352015-05-12 22:29:44 +0300572 &w1_master_attribute_timeout_us.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400573 &w1_master_attribute_pointer.attr,
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400574 &w1_master_attribute_search.attr,
David Fries6a158c02008-10-15 22:04:42 -0700575 &w1_master_attribute_pullup.attr,
David Fries9b467412008-10-15 22:04:43 -0700576 &w1_master_attribute_add.attr,
577 &w1_master_attribute_remove.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400578 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579};
580
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400581static struct attribute_group w1_master_defattr_group = {
582 .attrs = w1_master_default_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583};
584
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400585int w1_create_master_attributes(struct w1_master *master)
586{
587 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
588}
589
David Friesc30c9b12008-10-15 22:04:38 -0700590void w1_destroy_master_attributes(struct w1_master *master)
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400591{
592 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
593}
594
Kay Sievers7eff2e72007-08-14 15:15:12 +0200595static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400596{
597 struct w1_master *md = NULL;
598 struct w1_slave *sl = NULL;
599 char *event_owner, *name;
Devendra Naga526be412012-05-19 07:31:54 +0400600 int err = 0;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400601
602 if (dev->driver == &w1_master_driver) {
603 md = container_of(dev, struct w1_master, dev);
604 event_owner = "master";
605 name = md->name;
606 } else if (dev->driver == &w1_slave_driver) {
607 sl = container_of(dev, struct w1_slave, dev);
608 event_owner = "slave";
609 name = sl->name;
610 } else {
Kay Sievers312c0042005-11-16 09:00:00 +0100611 dev_dbg(dev, "Unknown event.\n");
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400612 return -EINVAL;
613 }
614
Andrew Mortonc6976a42006-05-14 21:43:50 -0700615 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
Kay Sievers40f91de2009-01-06 10:44:34 -0800616 event_owner, name, dev_name(dev));
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400617
618 if (dev->driver != &w1_slave_driver || !sl)
Devendra Naga526be412012-05-19 07:31:54 +0400619 goto end;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400620
Kay Sievers7eff2e72007-08-14 15:15:12 +0200621 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400622 if (err)
Devendra Naga526be412012-05-19 07:31:54 +0400623 goto end;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400624
Kay Sievers7eff2e72007-08-14 15:15:12 +0200625 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
626 (unsigned long long)sl->reg_num.id);
Devendra Naga526be412012-05-19 07:31:54 +0400627end:
628 return err;
629}
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400630
David Fries18d7f892014-04-16 01:21:21 -0500631static int w1_family_notify(unsigned long action, struct w1_slave *sl)
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700632{
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700633 struct w1_family_ops *fops;
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700634 int err;
635
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700636 fops = sl->family->fops;
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700637
Hans-Frieder Vogt2962aec2013-10-06 21:13:35 +0200638 if (!fops)
639 return 0;
640
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700641 switch (action) {
642 case BUS_NOTIFY_ADD_DEVICE:
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700643 /* if the family driver needs to initialize something... */
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700644 if (fops->add_slave) {
645 err = fops->add_slave(sl);
646 if (err < 0) {
647 dev_err(&sl->dev,
648 "add_slave() call failed. err=%d\n",
649 err);
650 return err;
651 }
652 }
653 if (fops->groups) {
654 err = sysfs_create_groups(&sl->dev.kobj, fops->groups);
655 if (err) {
656 dev_err(&sl->dev,
657 "sysfs group creation failed. err=%d\n",
658 err);
659 return err;
660 }
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700661 }
662
663 break;
664 case BUS_NOTIFY_DEL_DEVICE:
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700665 if (fops->remove_slave)
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700666 sl->family->fops->remove_slave(sl);
Greg Kroah-Hartman36c27a62013-08-21 15:44:55 -0700667 if (fops->groups)
668 sysfs_remove_groups(&sl->dev.kobj, fops->groups);
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700669 break;
670 }
671 return 0;
672}
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674static int __w1_attach_slave_device(struct w1_slave *sl)
675{
676 int err;
677
678 sl->dev.parent = &sl->master->dev;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400679 sl->dev.driver = &w1_slave_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 sl->dev.bus = &w1_bus_type;
681 sl->dev.release = &w1_slave_release;
Greg Kroah-Hartman5b187b32013-08-21 13:24:33 -0700682 sl->dev.groups = w1_slave_groups;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Kay Sievers40f91de2009-01-06 10:44:34 -0800684 dev_set_name(&sl->dev, "%02x-%012llx",
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400685 (unsigned int) sl->reg_num.family,
686 (unsigned long long) sl->reg_num.id);
687 snprintf(&sl->name[0], sizeof(sl->name),
688 "%02x-%012llx",
689 (unsigned int) sl->reg_num.family,
690 (unsigned long long) sl->reg_num.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Andrew Mortonc6976a42006-05-14 21:43:50 -0700692 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
Kay Sievers40f91de2009-01-06 10:44:34 -0800693 dev_name(&sl->dev), sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
David Fries18d7f892014-04-16 01:21:21 -0500695 /* suppress for w1_family_notify before sending KOBJ_ADD */
696 dev_set_uevent_suppress(&sl->dev, true);
697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 err = device_register(&sl->dev);
699 if (err < 0) {
700 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400701 "Device registration [%s] failed. err=%d\n",
Kay Sievers40f91de2009-01-06 10:44:34 -0800702 dev_name(&sl->dev), err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return err;
704 }
David Fries18d7f892014-04-16 01:21:21 -0500705 w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Greg Kroah-Hartman47eba332013-08-21 13:24:32 -0700707 dev_set_uevent_suppress(&sl->dev, false);
708 kobject_uevent(&sl->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
David Fries9fcbbac2014-01-15 22:29:18 -0600710 mutex_lock(&sl->master->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
David Fries9fcbbac2014-01-15 22:29:18 -0600712 mutex_unlock(&sl->master->list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 return 0;
715}
716
David Fries70b34d22014-01-15 22:29:17 -0600717int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718{
719 struct w1_slave *sl;
720 struct w1_family *f;
721 int err;
722 struct w1_netlink_msg msg;
723
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700724 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if (!sl) {
726 dev_err(&dev->dev,
727 "%s: failed to allocate new slave device.\n",
728 __func__);
729 return -ENOMEM;
730 }
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733 sl->owner = THIS_MODULE;
734 sl->master = dev;
Michal Nazarewiczbb670932013-11-12 15:11:42 -0800735 set_bit(W1_SLAVE_ACTIVE, &sl->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300737 memset(&msg, 0, sizeof(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
David Fries9fcbbac2014-01-15 22:29:18 -0600739 atomic_set(&sl->refcnt, 1);
740 atomic_inc(&sl->master->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Hans-Frieder Vogtbc04d762013-10-06 21:13:40 +0200742 /* slave modules need to be loaded in a context with unlocked mutex */
743 mutex_unlock(&dev->mutex);
NeilBrown4b7e4f82014-11-19 14:04:20 +1100744 request_module("w1-family-0x%02x", rn->family);
Hans-Frieder Vogtbc04d762013-10-06 21:13:40 +0200745 mutex_lock(&dev->mutex);
Alexander Stein8d7bda52013-05-26 20:06:50 +0200746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 spin_lock(&w1_flock);
748 f = w1_family_registered(rn->family);
749 if (!f) {
Evgeniy Polyakov99c5bfe2005-06-04 01:31:26 +0400750 f= &w1_default_family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
752 rn->family, rn->family,
753 (unsigned long long)rn->id, rn->crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 }
755 __w1_family_get(f);
756 spin_unlock(&w1_flock);
757
758 sl->family = f;
759
760
761 err = __w1_attach_slave_device(sl);
762 if (err < 0) {
763 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
764 sl->name);
765 w1_family_put(sl->family);
Maciej S. Szmigiero1de86952017-01-21 23:50:18 +0100766 atomic_dec(&sl->master->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 kfree(sl);
768 return err;
769 }
770
771 sl->ttl = dev->slave_ttl;
772 dev->slave_count++;
773
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300774 memcpy(msg.id.id, rn, sizeof(msg.id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 msg.type = W1_SLAVE_ADD;
776 w1_netlink_send(dev, &msg);
777
778 return 0;
779}
780
David Fries9fcbbac2014-01-15 22:29:18 -0600781int w1_unref_slave(struct w1_slave *sl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782{
David Fries9fcbbac2014-01-15 22:29:18 -0600783 struct w1_master *dev = sl->master;
784 int refcnt;
785 mutex_lock(&dev->list_mutex);
786 refcnt = atomic_sub_return(1, &sl->refcnt);
787 if (refcnt == 0) {
788 struct w1_netlink_msg msg;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400789
David Fries9fcbbac2014-01-15 22:29:18 -0600790 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__,
791 sl->name, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
David Fries9fcbbac2014-01-15 22:29:18 -0600793 list_del(&sl->w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
David Fries9fcbbac2014-01-15 22:29:18 -0600795 memset(&msg, 0, sizeof(msg));
796 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
797 msg.type = W1_SLAVE_REMOVE;
798 w1_netlink_send(sl->master, &msg);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400799
David Fries18d7f892014-04-16 01:21:21 -0500800 w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl);
David Fries9fcbbac2014-01-15 22:29:18 -0600801 device_unregister(&sl->dev);
802 #ifdef DEBUG
803 memset(sl, 0, sizeof(*sl));
804 #endif
805 kfree(sl);
806 }
807 atomic_dec(&dev->refcnt);
808 mutex_unlock(&dev->list_mutex);
809 return refcnt;
810}
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400811
David Fries9fcbbac2014-01-15 22:29:18 -0600812int w1_slave_detach(struct w1_slave *sl)
813{
814 /* Only detach a slave once as it decreases the refcnt each time. */
815 int destroy_now;
816 mutex_lock(&sl->master->list_mutex);
817 destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags);
818 set_bit(W1_SLAVE_DETACH, &sl->flags);
819 mutex_unlock(&sl->master->list_mutex);
820
821 if (destroy_now)
822 destroy_now = !w1_unref_slave(sl);
823 return destroy_now ? 0 : -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300826struct w1_master *w1_search_master_id(u32 id)
827{
828 struct w1_master *dev;
829 int found = 0;
830
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400831 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300832 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
833 if (dev->id == id) {
834 found = 1;
835 atomic_inc(&dev->refcnt);
836 break;
837 }
838 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400839 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300840
841 return (found)?dev:NULL;
842}
843
844struct w1_slave *w1_search_slave(struct w1_reg_num *id)
845{
846 struct w1_master *dev;
847 struct w1_slave *sl = NULL;
848 int found = 0;
849
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400850 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300851 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
David Fries9fcbbac2014-01-15 22:29:18 -0600852 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300853 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
854 if (sl->reg_num.family == id->family &&
855 sl->reg_num.id == id->id &&
856 sl->reg_num.crc == id->crc) {
857 found = 1;
858 atomic_inc(&dev->refcnt);
859 atomic_inc(&sl->refcnt);
860 break;
861 }
862 }
David Fries9fcbbac2014-01-15 22:29:18 -0600863 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300864
865 if (found)
866 break;
867 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400868 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300869
870 return (found)?sl:NULL;
871}
872
David Friesc30c9b12008-10-15 22:04:38 -0700873void w1_reconnect_slaves(struct w1_family *f, int attach)
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400874{
David Friesc30c9b12008-10-15 22:04:38 -0700875 struct w1_slave *sl, *sln;
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400876 struct w1_master *dev;
877
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400878 mutex_lock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400879 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
David Friesc30c9b12008-10-15 22:04:38 -0700880 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
881 "for family %02x.\n", dev->name, f->fid);
882 mutex_lock(&dev->mutex);
David Fries9fcbbac2014-01-15 22:29:18 -0600883 mutex_lock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700884 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
885 /* If it is a new family, slaves with the default
886 * family driver and are that family will be
887 * connected. If the family is going away, devices
888 * matching that family are reconneced.
889 */
890 if ((attach && sl->family->fid == W1_FAMILY_DEFAULT
891 && sl->reg_num.family == f->fid) ||
892 (!attach && sl->family->fid == f->fid)) {
893 struct w1_reg_num rn;
894
David Fries9fcbbac2014-01-15 22:29:18 -0600895 mutex_unlock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700896 memcpy(&rn, &sl->reg_num, sizeof(rn));
David Fries9fcbbac2014-01-15 22:29:18 -0600897 /* If it was already in use let the automatic
898 * scan pick it up again later.
899 */
900 if (!w1_slave_detach(sl))
901 w1_attach_slave_device(dev, &rn);
902 mutex_lock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700903 }
904 }
905 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
906 "has been finished.\n", dev->name);
David Fries9fcbbac2014-01-15 22:29:18 -0600907 mutex_unlock(&dev->list_mutex);
David Friesc30c9b12008-10-15 22:04:38 -0700908 mutex_unlock(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400909 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400910 mutex_unlock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400911}
912
David Fries963bb102011-05-26 16:26:03 -0700913void w1_slave_found(struct w1_master *dev, u64 rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 struct w1_slave *sl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 struct w1_reg_num *tmp;
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400917 u64 rn_le = cpu_to_le64(rn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
David Friesc30c9b12008-10-15 22:04:38 -0700919 atomic_inc(&dev->refcnt);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400920
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 tmp = (struct w1_reg_num *) &rn;
922
David Friescd7b28d2008-10-15 22:04:44 -0700923 sl = w1_slave_search_device(dev, tmp);
924 if (sl) {
Michal Nazarewiczbb670932013-11-12 15:11:42 -0800925 set_bit(W1_SLAVE_ACTIVE, &sl->flags);
David Friescd7b28d2008-10-15 22:04:44 -0700926 } else {
927 if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7))
928 w1_attach_slave_device(dev, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400930
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 atomic_dec(&dev->refcnt);
932}
933
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400934/**
David Friesb3be1772014-01-15 22:29:25 -0600935 * w1_search() - Performs a ROM Search & registers any devices found.
936 * @dev: The master device to search
937 * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH
938 * to return only devices in the alarmed state
939 * @cb: Function to call when a device is found
940 *
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400941 * The 1-wire search is a simple binary tree search.
942 * For each bit of the address, we read two bits and write one bit.
943 * The bit written will put to sleep all devies that don't match that bit.
944 * When the two reads differ, the direction choice is obvious.
945 * When both bits are 0, we must choose a path to take.
946 * When we can scan all 64 bits without having to choose a path, we are done.
947 *
948 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
949 *
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400950 */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300951void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400953 u64 last_rn, rn, tmp64;
954 int i, slave_count = 0;
955 int last_zero, last_device;
956 int search_bit, desc_bit;
957 u8 triplet_ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400959 search_bit = 0;
David Fries3c6955e2014-01-15 22:29:16 -0600960 rn = dev->search_id;
961 last_rn = 0;
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400962 last_device = 0;
963 last_zero = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
965 desc_bit = 64;
966
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400967 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
968 last_rn = rn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 rn = 0;
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 /*
972 * Reset bus and all 1-wire device state machines
973 * so they can respond to our requests.
974 *
975 * Return 0 - device(s) present, 1 - no devices present.
976 */
NeilBrownb02f8be2012-05-18 15:59:52 +1000977 mutex_lock(&dev->bus_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 if (w1_reset_bus(dev)) {
NeilBrownb02f8be2012-05-18 15:59:52 +1000979 mutex_unlock(&dev->bus_mutex);
Evgeniy Polyakov2da5bf82005-08-12 11:46:22 -0700980 dev_dbg(&dev->dev, "No devices present on the wire.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 break;
982 }
983
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300984 /* Do fast search on single slave bus */
985 if (dev->max_slave_count == 1) {
NeilBrownb02f8be2012-05-18 15:59:52 +1000986 int rv;
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300987 w1_write_8(dev, W1_READ_ROM);
NeilBrownb02f8be2012-05-18 15:59:52 +1000988 rv = w1_read_block(dev, (u8 *)&rn, 8);
989 mutex_unlock(&dev->bus_mutex);
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300990
NeilBrownb02f8be2012-05-18 15:59:52 +1000991 if (rv == 8 && rn)
Evgeniy Polyakovc9cbf552011-12-10 04:36:11 +0300992 cb(dev, rn);
993
994 break;
995 }
996
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400997 /* Start the search */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300998 w1_write_8(dev, search_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 for (i = 0; i < 64; ++i) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001000 /* Determine the direction/search bit */
1001 if (i == desc_bit)
1002 search_bit = 1; /* took the 0 path last time, so take the 1 path */
1003 else if (i > desc_bit)
1004 search_bit = 0; /* take the 0 path on the next branch */
1005 else
1006 search_bit = ((last_rn >> i) & 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
David Friesb3be1772014-01-15 22:29:25 -06001008 /* Read two bits and write one bit */
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001009 triplet_ret = w1_triplet(dev, search_bit);
1010
1011 /* quit if no device responded */
1012 if ( (triplet_ret & 0x03) == 0x03 )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 break;
1014
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001015 /* If both directions were valid, and we took the 0 path... */
1016 if (triplet_ret == 0)
1017 last_zero = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001019 /* extract the direction taken & update the device number */
1020 tmp64 = (triplet_ret >> 2);
1021 rn |= (tmp64 << i);
David Fries0d671b22008-10-15 22:04:39 -07001022
David Fries42105692014-01-15 22:29:13 -06001023 if (test_bit(W1_ABORT_SEARCH, &dev->flags)) {
NeilBrownb02f8be2012-05-18 15:59:52 +10001024 mutex_unlock(&dev->bus_mutex);
David Fries7dc8f522008-10-15 22:04:58 -07001025 dev_dbg(&dev->dev, "Abort w1_search\n");
David Fries0d671b22008-10-15 22:04:39 -07001026 return;
1027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 }
NeilBrownb02f8be2012-05-18 15:59:52 +10001029 mutex_unlock(&dev->bus_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001031 if ( (triplet_ret & 0x03) != 0x03 ) {
David Fries3c6955e2014-01-15 22:29:16 -06001032 if ((desc_bit == last_zero) || (last_zero < 0)) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001033 last_device = 1;
David Fries3c6955e2014-01-15 22:29:16 -06001034 dev->search_id = 0;
1035 } else {
1036 dev->search_id = rn;
1037 }
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001038 desc_bit = last_zero;
David Friesc30c9b12008-10-15 22:04:38 -07001039 cb(dev, rn);
Evgeniy Polyakov6b729862005-06-04 01:30:43 +04001040 }
David Friesa1613052014-01-15 22:29:15 -06001041
1042 if (!last_device && slave_count == dev->max_slave_count &&
1043 !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) {
David Fries3c6955e2014-01-15 22:29:16 -06001044 /* Only max_slave_count will be scanned in a search,
1045 * but it will start where it left off next search
1046 * until all ids are identified and then it will start
1047 * over. A continued search will report the previous
1048 * last id as the first id (provided it is still on the
1049 * bus).
1050 */
David Friesa1613052014-01-15 22:29:15 -06001051 dev_info(&dev->dev, "%s: max_slave_count %d reached, "
David Fries3c6955e2014-01-15 22:29:16 -06001052 "will continue next search.\n", __func__,
David Friesa1613052014-01-15 22:29:15 -06001053 dev->max_slave_count);
1054 set_bit(W1_WARN_MAX_COUNT, &dev->flags);
1055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 }
1057}
1058
David Fries963bb102011-05-26 16:26:03 -07001059void w1_search_process_cb(struct w1_master *dev, u8 search_type,
1060 w1_slave_found_callback cb)
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001061{
1062 struct w1_slave *sl, *sln;
1063
David Fries9fcbbac2014-01-15 22:29:18 -06001064 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001065 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
Michal Nazarewiczbb670932013-11-12 15:11:42 -08001066 clear_bit(W1_SLAVE_ACTIVE, &sl->flags);
David Fries9fcbbac2014-01-15 22:29:18 -06001067 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001068
David Fries963bb102011-05-26 16:26:03 -07001069 w1_search_devices(dev, search_type, cb);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001070
David Fries9fcbbac2014-01-15 22:29:18 -06001071 mutex_lock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001072 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
David Fries9fcbbac2014-01-15 22:29:18 -06001073 if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) {
1074 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001075 w1_slave_detach(sl);
David Fries9fcbbac2014-01-15 22:29:18 -06001076 mutex_lock(&dev->list_mutex);
1077 }
Michal Nazarewiczbb670932013-11-12 15:11:42 -08001078 else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags))
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001079 sl->ttl = dev->slave_ttl;
1080 }
David Fries9fcbbac2014-01-15 22:29:18 -06001081 mutex_unlock(&dev->list_mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001082
1083 if (dev->search_count > 0)
1084 dev->search_count--;
1085}
1086
David Fries963bb102011-05-26 16:26:03 -07001087static void w1_search_process(struct w1_master *dev, u8 search_type)
1088{
1089 w1_search_process_cb(dev, search_type, w1_slave_found);
1090}
1091
David Friesb3be1772014-01-15 22:29:25 -06001092/**
1093 * w1_process_callbacks() - execute each dev->async_list callback entry
1094 * @dev: w1_master device
1095 *
Alexey Khoroshilova0f10462014-05-07 01:26:04 +04001096 * The w1 master list_mutex must be held.
1097 *
David Friesb3be1772014-01-15 22:29:25 -06001098 * Return: 1 if there were commands to executed 0 otherwise
1099 */
David Fries9fcbbac2014-01-15 22:29:18 -06001100int w1_process_callbacks(struct w1_master *dev)
1101{
1102 int ret = 0;
1103 struct w1_async_cmd *async_cmd, *async_n;
1104
1105 /* The list can be added to in another thread, loop until it is empty */
1106 while (!list_empty(&dev->async_list)) {
1107 list_for_each_entry_safe(async_cmd, async_n, &dev->async_list,
1108 async_entry) {
1109 /* drop the lock, if it is a search it can take a long
1110 * time */
1111 mutex_unlock(&dev->list_mutex);
1112 async_cmd->cb(dev, async_cmd);
1113 ret = 1;
1114 mutex_lock(&dev->list_mutex);
1115 }
1116 }
1117 return ret;
1118}
1119
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120int w1_process(void *data)
1121{
1122 struct w1_master *dev = (struct w1_master *) data;
David Fries3c52e4e2008-10-15 22:04:41 -07001123 /* As long as w1_timeout is only set by a module parameter the sleep
1124 * time can be calculated in jiffies once.
1125 */
Dmitry Khromovc3098352015-05-12 22:29:44 +03001126 const unsigned long jtime =
1127 usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us);
David Fries9fcbbac2014-01-15 22:29:18 -06001128 /* remainder if it woke up early */
1129 unsigned long jremain = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
David Fries9fcbbac2014-01-15 22:29:18 -06001131 for (;;) {
1132
1133 if (!jremain && dev->search_count) {
David Fries01e14d62008-10-15 22:04:40 -07001134 mutex_lock(&dev->mutex);
1135 w1_search_process(dev, W1_SEARCH);
1136 mutex_unlock(&dev->mutex);
1137 }
1138
David Fries9fcbbac2014-01-15 22:29:18 -06001139 mutex_lock(&dev->list_mutex);
1140 /* Note, w1_process_callback drops the lock while processing,
1141 * but locks it again before returning.
1142 */
1143 if (!w1_process_callbacks(dev) && jremain) {
1144 /* a wake up is either to stop the thread, process
1145 * callbacks, or search, it isn't process callbacks, so
1146 * schedule a search.
1147 */
1148 jremain = 1;
1149 }
1150
David Fries3c52e4e2008-10-15 22:04:41 -07001151 __set_current_state(TASK_INTERRUPTIBLE);
1152
David Fries9fcbbac2014-01-15 22:29:18 -06001153 /* hold list_mutex until after interruptible to prevent loosing
1154 * the wakeup signal when async_cmd is added.
1155 */
1156 mutex_unlock(&dev->list_mutex);
1157
David Fries3c52e4e2008-10-15 22:04:41 -07001158 if (kthread_should_stop())
1159 break;
1160
1161 /* Only sleep when the search is active. */
David Fries9fcbbac2014-01-15 22:29:18 -06001162 if (dev->search_count) {
1163 if (!jremain)
1164 jremain = jtime;
1165 jremain = schedule_timeout(jremain);
1166 }
David Fries3c52e4e2008-10-15 22:04:41 -07001167 else
1168 schedule();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 }
1170
1171 atomic_dec(&dev->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 return 0;
1174}
1175
Peter Huewe73a98fc2009-12-22 09:38:02 +01001176static int __init w1_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177{
1178 int retval;
1179
Fjodor Schelichowfdc91672014-06-19 02:52:00 +02001180 pr_info("Driver for 1-wire Dallas network protocol.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001182 w1_init_netlink();
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 retval = bus_register(&w1_bus_type);
1185 if (retval) {
Fjodor Schelichowfdc91672014-06-19 02:52:00 +02001186 pr_err("Failed to register bus. err=%d.\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 goto err_out_exit_init;
1188 }
1189
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001190 retval = driver_register(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 if (retval) {
Fjodor Schelichowfdc91672014-06-19 02:52:00 +02001192 pr_err("Failed to register master driver. err=%d.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 retval);
1194 goto err_out_bus_unregister;
1195 }
1196
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001197 retval = driver_register(&w1_slave_driver);
1198 if (retval) {
Fjodor Schelichowfdc91672014-06-19 02:52:00 +02001199 pr_err("Failed to register slave driver. err=%d.\n",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001200 retval);
1201 goto err_out_master_unregister;
1202 }
1203
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 return 0;
1205
David Friesc30c9b12008-10-15 22:04:38 -07001206#if 0
1207/* For undoing the slave register if there was a step after it. */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001208err_out_slave_unregister:
1209 driver_unregister(&w1_slave_driver);
David Friesc30c9b12008-10-15 22:04:38 -07001210#endif
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001211
1212err_out_master_unregister:
1213 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
1215err_out_bus_unregister:
1216 bus_unregister(&w1_bus_type);
1217
1218err_out_exit_init:
1219 return retval;
1220}
1221
Peter Huewe73a98fc2009-12-22 09:38:02 +01001222static void __exit w1_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223{
1224 struct w1_master *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
David Friesc30c9b12008-10-15 22:04:38 -07001226 /* Set netlink removal messages and some cleanup */
Evgeniy Polyakov77859252005-05-20 22:33:25 +04001227 list_for_each_entry(dev, &w1_masters, w1_master_entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 __w1_remove_master_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
Evgeniy Polyakov12003372006-03-23 19:11:58 +03001230 w1_fini_netlink();
1231
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +04001232 driver_unregister(&w1_slave_driver);
1233 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 bus_unregister(&w1_bus_type);
1235}
1236
1237module_init(w1_init);
1238module_exit(w1_fini);