Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 2 | * w1.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Evgeniy Polyakov | a801876 | 2011-08-25 15:59:06 -0700 | [diff] [blame] | 4 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 5 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 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 Polyakov | 674a396c | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 33 | #include <linux/kthread.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 34 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 36 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include "w1.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "w1_log.h" |
| 40 | #include "w1_int.h" |
| 41 | #include "w1_family.h" |
| 42 | #include "w1_netlink.h" |
| 43 | |
| 44 | MODULE_LICENSE("GPL"); |
Evgeniy Polyakov | a801876 | 2011-08-25 15:59:06 -0700 | [diff] [blame] | 45 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); |
| 47 | |
| 48 | static int w1_timeout = 10; |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 49 | int w1_max_slave_count = 64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | int w1_max_slave_ttl = 10; |
| 51 | |
| 52 | module_param_named(timeout, w1_timeout, int, 0); |
| 53 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
| 54 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
| 55 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 56 | DEFINE_MUTEX(w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | LIST_HEAD(w1_masters); |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
| 60 | { |
| 61 | return 1; |
| 62 | } |
| 63 | |
| 64 | static int w1_master_probe(struct device *dev) |
| 65 | { |
| 66 | return -ENODEV; |
| 67 | } |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | static void w1_master_release(struct device *dev) |
| 70 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 71 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 72 | |
| 73 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 74 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
| 75 | kfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | static void w1_slave_release(struct device *dev) |
| 79 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 80 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 81 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 82 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 83 | |
| 84 | w1_family_put(sl->family); |
| 85 | sl->master->slave_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
| 87 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 88 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 90 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 91 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 92 | return sprintf(buf, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 94 | static DEVICE_ATTR_RO(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 96 | static ssize_t id_show(struct device *dev, |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 97 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 99 | struct w1_slave *sl = dev_to_w1_slave(dev); |
| 100 | ssize_t count = sizeof(sl->reg_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 102 | memcpy(buf, (u8 *)&sl->reg_num, count); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 103 | return count; |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 104 | } |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 105 | static DEVICE_ATTR_RO(id); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 106 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 107 | static struct attribute *w1_slave_attrs[] = { |
| 108 | &dev_attr_name.attr, |
| 109 | &dev_attr_id.attr, |
| 110 | NULL, |
| 111 | }; |
| 112 | ATTRIBUTE_GROUPS(w1_slave); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 113 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 114 | /* Default family */ |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 115 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 116 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
| 117 | struct bin_attribute *bin_attr, char *buf, loff_t off, |
| 118 | size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 119 | { |
| 120 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 121 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 122 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 123 | if (w1_reset_select_slave(sl)) { |
| 124 | count = 0; |
| 125 | goto out_up; |
| 126 | } |
| 127 | |
| 128 | w1_write_block(sl->master, buf, count); |
| 129 | |
| 130 | out_up: |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 131 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 132 | return count; |
| 133 | } |
| 134 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 135 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
| 136 | struct bin_attribute *bin_attr, char *buf, loff_t off, |
| 137 | size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 138 | { |
| 139 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 140 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 141 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 142 | w1_read_block(sl->master, buf, count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 143 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 144 | return count; |
| 145 | } |
| 146 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 147 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
| 148 | |
| 149 | static struct bin_attribute *w1_slave_bin_attrs[] = { |
| 150 | &bin_attr_rw, |
| 151 | NULL, |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 152 | }; |
| 153 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 154 | static const struct attribute_group w1_slave_default_group = { |
| 155 | .bin_attrs = w1_slave_bin_attrs, |
| 156 | }; |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 157 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 158 | static const struct attribute_group *w1_slave_default_groups[] = { |
| 159 | &w1_slave_default_group, |
| 160 | NULL, |
| 161 | }; |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 162 | |
| 163 | static struct w1_family_ops w1_default_fops = { |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 164 | .groups = w1_slave_default_groups, |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 165 | }; |
| 166 | |
| 167 | static struct w1_family w1_default_family = { |
| 168 | .fops = &w1_default_fops, |
| 169 | }; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 170 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 171 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | static struct bus_type w1_bus_type = { |
| 174 | .name = "w1", |
| 175 | .match = w1_master_match, |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 176 | .uevent = w1_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | }; |
| 178 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 179 | struct device_driver w1_master_driver = { |
| 180 | .name = "w1_master_driver", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | .bus = &w1_bus_type, |
| 182 | .probe = w1_master_probe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | }; |
| 184 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 185 | struct device w1_master_device = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | .parent = NULL, |
| 187 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 188 | .init_name = "w1 bus master", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 189 | .driver = &w1_master_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | .release = &w1_master_release |
| 191 | }; |
| 192 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 193 | static struct device_driver w1_slave_driver = { |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 194 | .name = "w1_slave_driver", |
| 195 | .bus = &w1_bus_type, |
| 196 | }; |
| 197 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 198 | #if 0 |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 199 | struct device w1_slave_device = { |
| 200 | .parent = NULL, |
| 201 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 202 | .init_name = "w1 bus slave", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 203 | .driver = &w1_slave_driver, |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 204 | .release = &w1_slave_release |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 205 | }; |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 206 | #endif /* 0 */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 207 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 208 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 210 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 212 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 213 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | count = sprintf(buf, "%s\n", md->name); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 215 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | return count; |
| 218 | } |
| 219 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 220 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
| 221 | struct device_attribute *attr, |
| 222 | const char * buf, size_t count) |
| 223 | { |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 224 | long tmp; |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 225 | struct w1_master *md = dev_to_w1_master(dev); |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 226 | int ret; |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 227 | |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 228 | ret = kstrtol(buf, 0, &tmp); |
| 229 | if (ret) |
| 230 | return ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 231 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 232 | mutex_lock(&md->mutex); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 233 | md->search_count = tmp; |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 234 | mutex_unlock(&md->mutex); |
David Fries | af8c723 | 2014-01-15 22:29:14 -0600 | [diff] [blame] | 235 | /* Only wake if it is going to be searching. */ |
| 236 | if (tmp) |
| 237 | wake_up_process(md->thread); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 238 | |
| 239 | return count; |
| 240 | } |
| 241 | |
| 242 | static ssize_t w1_master_attribute_show_search(struct device *dev, |
| 243 | struct device_attribute *attr, |
| 244 | char *buf) |
| 245 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 246 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 247 | ssize_t count; |
| 248 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 249 | mutex_lock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 250 | count = sprintf(buf, "%d\n", md->search_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 251 | mutex_unlock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 252 | |
| 253 | return count; |
| 254 | } |
| 255 | |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 256 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
| 257 | struct device_attribute *attr, |
| 258 | const char *buf, size_t count) |
| 259 | { |
| 260 | long tmp; |
| 261 | struct w1_master *md = dev_to_w1_master(dev); |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 262 | int ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 263 | |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 264 | ret = kstrtol(buf, 0, &tmp); |
| 265 | if (ret) |
| 266 | return ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 267 | |
| 268 | mutex_lock(&md->mutex); |
| 269 | md->enable_pullup = tmp; |
| 270 | mutex_unlock(&md->mutex); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 271 | |
| 272 | return count; |
| 273 | } |
| 274 | |
| 275 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, |
| 276 | struct device_attribute *attr, |
| 277 | char *buf) |
| 278 | { |
| 279 | struct w1_master *md = dev_to_w1_master(dev); |
| 280 | ssize_t count; |
| 281 | |
| 282 | mutex_lock(&md->mutex); |
| 283 | count = sprintf(buf, "%d\n", md->enable_pullup); |
| 284 | mutex_unlock(&md->mutex); |
| 285 | |
| 286 | return count; |
| 287 | } |
| 288 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 289 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 291 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 293 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 294 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | count = sprintf(buf, "0x%p\n", md->bus_master); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 296 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | return count; |
| 298 | } |
| 299 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 300 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | { |
| 302 | ssize_t count; |
| 303 | count = sprintf(buf, "%d\n", w1_timeout); |
| 304 | return count; |
| 305 | } |
| 306 | |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 307 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
| 308 | struct device_attribute *attr, const char *buf, size_t count) |
| 309 | { |
| 310 | long tmp; |
| 311 | struct w1_master *md = dev_to_w1_master(dev); |
| 312 | |
| 313 | if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | mutex_lock(&md->mutex); |
| 317 | md->max_slave_count = tmp; |
| 318 | /* allow each time the max_slave_count is updated */ |
| 319 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); |
| 320 | mutex_unlock(&md->mutex); |
| 321 | |
| 322 | return count; |
| 323 | } |
| 324 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 325 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 327 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 329 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 330 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | count = sprintf(buf, "%d\n", md->max_slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 332 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return count; |
| 334 | } |
| 335 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 336 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 338 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 340 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 341 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | count = sprintf(buf, "%lu\n", md->attempts); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 343 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | return count; |
| 345 | } |
| 346 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 347 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 349 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 351 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 352 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | count = sprintf(buf, "%d\n", md->slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 354 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return count; |
| 356 | } |
| 357 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 358 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
| 359 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 361 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | int c = PAGE_SIZE; |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 363 | struct list_head *ent, *n; |
| 364 | struct w1_slave *sl = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 366 | mutex_lock(&md->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 368 | list_for_each_safe(ent, n, &md->slist) { |
| 369 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 371 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 373 | if (!sl) |
| 374 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 376 | mutex_unlock(&md->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | return PAGE_SIZE - c; |
| 379 | } |
| 380 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 381 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
| 382 | struct device_attribute *attr, char *buf) |
| 383 | { |
| 384 | int c = PAGE_SIZE; |
| 385 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 386 | "write device id xx-xxxxxxxxxxxx to add slave\n"); |
| 387 | return PAGE_SIZE - c; |
| 388 | } |
| 389 | |
| 390 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, |
| 391 | struct w1_reg_num *rn) |
| 392 | { |
| 393 | unsigned int family; |
| 394 | unsigned long long id; |
| 395 | int i; |
| 396 | u64 rn64_le; |
| 397 | |
| 398 | /* The CRC value isn't read from the user because the sysfs directory |
| 399 | * doesn't include it and most messages from the bus search don't |
| 400 | * print it either. It would be unreasonable for the user to then |
| 401 | * provide it. |
| 402 | */ |
| 403 | const char *error_msg = "bad slave string format, expecting " |
| 404 | "ff-dddddddddddd\n"; |
| 405 | |
| 406 | if (buf[2] != '-') { |
| 407 | dev_err(dev, "%s", error_msg); |
| 408 | return -EINVAL; |
| 409 | } |
| 410 | i = sscanf(buf, "%02x-%012llx", &family, &id); |
| 411 | if (i != 2) { |
| 412 | dev_err(dev, "%s", error_msg); |
| 413 | return -EINVAL; |
| 414 | } |
| 415 | rn->family = family; |
| 416 | rn->id = id; |
| 417 | |
| 418 | rn64_le = cpu_to_le64(*(u64 *)rn); |
| 419 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); |
| 420 | |
| 421 | #if 0 |
| 422 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", |
| 423 | rn->family, (unsigned long long)rn->id, rn->crc); |
| 424 | #endif |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /* Searches the slaves in the w1_master and returns a pointer or NULL. |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 430 | * Note: must not hold list_mutex |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 431 | */ |
David Fries | 70b34d2 | 2014-01-15 22:29:17 -0600 | [diff] [blame] | 432 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 433 | struct w1_reg_num *rn) |
| 434 | { |
| 435 | struct w1_slave *sl; |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 436 | mutex_lock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 437 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 438 | if (sl->reg_num.family == rn->family && |
| 439 | sl->reg_num.id == rn->id && |
| 440 | sl->reg_num.crc == rn->crc) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 441 | mutex_unlock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 442 | return sl; |
| 443 | } |
| 444 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 445 | mutex_unlock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 446 | return NULL; |
| 447 | } |
| 448 | |
| 449 | static ssize_t w1_master_attribute_store_add(struct device *dev, |
| 450 | struct device_attribute *attr, |
| 451 | const char *buf, size_t count) |
| 452 | { |
| 453 | struct w1_master *md = dev_to_w1_master(dev); |
| 454 | struct w1_reg_num rn; |
| 455 | struct w1_slave *sl; |
| 456 | ssize_t result = count; |
| 457 | |
| 458 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 459 | return -EINVAL; |
| 460 | |
| 461 | mutex_lock(&md->mutex); |
| 462 | sl = w1_slave_search_device(md, &rn); |
| 463 | /* It would be nice to do a targeted search one the one-wire bus |
| 464 | * for the new device to see if it is out there or not. But the |
| 465 | * current search doesn't support that. |
| 466 | */ |
| 467 | if (sl) { |
| 468 | dev_info(dev, "Device %s already exists\n", sl->name); |
| 469 | result = -EINVAL; |
| 470 | } else { |
| 471 | w1_attach_slave_device(md, &rn); |
| 472 | } |
| 473 | mutex_unlock(&md->mutex); |
| 474 | |
| 475 | return result; |
| 476 | } |
| 477 | |
| 478 | static ssize_t w1_master_attribute_show_remove(struct device *dev, |
| 479 | struct device_attribute *attr, char *buf) |
| 480 | { |
| 481 | int c = PAGE_SIZE; |
| 482 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 483 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); |
| 484 | return PAGE_SIZE - c; |
| 485 | } |
| 486 | |
| 487 | static ssize_t w1_master_attribute_store_remove(struct device *dev, |
| 488 | struct device_attribute *attr, |
| 489 | const char *buf, size_t count) |
| 490 | { |
| 491 | struct w1_master *md = dev_to_w1_master(dev); |
| 492 | struct w1_reg_num rn; |
| 493 | struct w1_slave *sl; |
| 494 | ssize_t result = count; |
| 495 | |
| 496 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 497 | return -EINVAL; |
| 498 | |
| 499 | mutex_lock(&md->mutex); |
| 500 | sl = w1_slave_search_device(md, &rn); |
| 501 | if (sl) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 502 | result = w1_slave_detach(sl); |
| 503 | /* refcnt 0 means it was detached in the call */ |
| 504 | if (result == 0) |
| 505 | result = count; |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 506 | } else { |
| 507 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, |
| 508 | (unsigned long long)rn.id); |
| 509 | result = -EINVAL; |
| 510 | } |
| 511 | mutex_unlock(&md->mutex); |
| 512 | |
| 513 | return result; |
| 514 | } |
| 515 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 516 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
| 517 | struct device_attribute w1_master_attribute_##_name = \ |
| 518 | __ATTR(w1_master_##_name, _mode, \ |
| 519 | w1_master_attribute_show_##_name, NULL) |
| 520 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 521 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
| 522 | struct device_attribute w1_master_attribute_##_name = \ |
| 523 | __ATTR(w1_master_##_name, _mode, \ |
| 524 | w1_master_attribute_show_##_name, \ |
| 525 | w1_master_attribute_store_##_name) |
| 526 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 527 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
| 528 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); |
| 529 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 530 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 531 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
| 532 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); |
| 533 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
Brian Swetland | 12aa4c6 | 2010-10-27 15:34:49 -0700 | [diff] [blame] | 534 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
| 535 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); |
| 536 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); |
| 537 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 538 | |
| 539 | static struct attribute *w1_master_default_attrs[] = { |
| 540 | &w1_master_attribute_name.attr, |
| 541 | &w1_master_attribute_slaves.attr, |
| 542 | &w1_master_attribute_slave_count.attr, |
| 543 | &w1_master_attribute_max_slave_count.attr, |
| 544 | &w1_master_attribute_attempts.attr, |
| 545 | &w1_master_attribute_timeout.attr, |
| 546 | &w1_master_attribute_pointer.attr, |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 547 | &w1_master_attribute_search.attr, |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 548 | &w1_master_attribute_pullup.attr, |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 549 | &w1_master_attribute_add.attr, |
| 550 | &w1_master_attribute_remove.attr, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 551 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | }; |
| 553 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 554 | static struct attribute_group w1_master_defattr_group = { |
| 555 | .attrs = w1_master_default_attrs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | }; |
| 557 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 558 | int w1_create_master_attributes(struct w1_master *master) |
| 559 | { |
| 560 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); |
| 561 | } |
| 562 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 563 | void w1_destroy_master_attributes(struct w1_master *master) |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 564 | { |
| 565 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); |
| 566 | } |
| 567 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 568 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 569 | { |
| 570 | struct w1_master *md = NULL; |
| 571 | struct w1_slave *sl = NULL; |
| 572 | char *event_owner, *name; |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 573 | int err = 0; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 574 | |
| 575 | if (dev->driver == &w1_master_driver) { |
| 576 | md = container_of(dev, struct w1_master, dev); |
| 577 | event_owner = "master"; |
| 578 | name = md->name; |
| 579 | } else if (dev->driver == &w1_slave_driver) { |
| 580 | sl = container_of(dev, struct w1_slave, dev); |
| 581 | event_owner = "slave"; |
| 582 | name = sl->name; |
| 583 | } else { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 584 | dev_dbg(dev, "Unknown event.\n"); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 585 | return -EINVAL; |
| 586 | } |
| 587 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 588 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 589 | event_owner, name, dev_name(dev)); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 590 | |
| 591 | if (dev->driver != &w1_slave_driver || !sl) |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 592 | goto end; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 593 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 594 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 595 | if (err) |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 596 | goto end; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 597 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 598 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
| 599 | (unsigned long long)sl->reg_num.id); |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 600 | end: |
| 601 | return err; |
| 602 | } |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 603 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 604 | /* |
| 605 | * Handle sysfs file creation and removal here, before userspace is told that |
| 606 | * the device is added / removed from the system |
| 607 | */ |
| 608 | static int w1_bus_notify(struct notifier_block *nb, unsigned long action, |
| 609 | void *data) |
| 610 | { |
| 611 | struct device *dev = data; |
| 612 | struct w1_slave *sl; |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 613 | struct w1_family_ops *fops; |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 614 | int err; |
| 615 | |
| 616 | /* |
| 617 | * Only care about slave devices at the moment. Yes, we should use a |
| 618 | * separate "type" for this, but for now, look at the release function |
| 619 | * to know which type it is... |
| 620 | */ |
| 621 | if (dev->release != w1_slave_release) |
| 622 | return 0; |
| 623 | |
| 624 | sl = dev_to_w1_slave(dev); |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 625 | fops = sl->family->fops; |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 626 | |
Hans-Frieder Vogt | 2962aec | 2013-10-06 21:13:35 +0200 | [diff] [blame] | 627 | if (!fops) |
| 628 | return 0; |
| 629 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 630 | switch (action) { |
| 631 | case BUS_NOTIFY_ADD_DEVICE: |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 632 | /* if the family driver needs to initialize something... */ |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 633 | if (fops->add_slave) { |
| 634 | err = fops->add_slave(sl); |
| 635 | if (err < 0) { |
| 636 | dev_err(&sl->dev, |
| 637 | "add_slave() call failed. err=%d\n", |
| 638 | err); |
| 639 | return err; |
| 640 | } |
| 641 | } |
| 642 | if (fops->groups) { |
| 643 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); |
| 644 | if (err) { |
| 645 | dev_err(&sl->dev, |
| 646 | "sysfs group creation failed. err=%d\n", |
| 647 | err); |
| 648 | return err; |
| 649 | } |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | break; |
| 653 | case BUS_NOTIFY_DEL_DEVICE: |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 654 | if (fops->remove_slave) |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 655 | sl->family->fops->remove_slave(sl); |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 656 | if (fops->groups) |
| 657 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 658 | break; |
| 659 | } |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static struct notifier_block w1_bus_nb = { |
| 664 | .notifier_call = w1_bus_notify, |
| 665 | }; |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | static int __w1_attach_slave_device(struct w1_slave *sl) |
| 668 | { |
| 669 | int err; |
| 670 | |
| 671 | sl->dev.parent = &sl->master->dev; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 672 | sl->dev.driver = &w1_slave_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | sl->dev.bus = &w1_bus_type; |
| 674 | sl->dev.release = &w1_slave_release; |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 675 | sl->dev.groups = w1_slave_groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 677 | dev_set_name(&sl->dev, "%02x-%012llx", |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 678 | (unsigned int) sl->reg_num.family, |
| 679 | (unsigned long long) sl->reg_num.id); |
| 680 | snprintf(&sl->name[0], sizeof(sl->name), |
| 681 | "%02x-%012llx", |
| 682 | (unsigned int) sl->reg_num.family, |
| 683 | (unsigned long long) sl->reg_num.id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 685 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 686 | dev_name(&sl->dev), sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | err = device_register(&sl->dev); |
| 689 | if (err < 0) { |
| 690 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 691 | "Device registration [%s] failed. err=%d\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 692 | dev_name(&sl->dev), err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | return err; |
| 694 | } |
| 695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 697 | dev_set_uevent_suppress(&sl->dev, false); |
| 698 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 700 | mutex_lock(&sl->master->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 702 | mutex_unlock(&sl->master->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | return 0; |
| 705 | } |
| 706 | |
David Fries | 70b34d2 | 2014-01-15 22:29:17 -0600 | [diff] [blame] | 707 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
| 709 | struct w1_slave *sl; |
| 710 | struct w1_family *f; |
| 711 | int err; |
| 712 | struct w1_netlink_msg msg; |
| 713 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 714 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if (!sl) { |
| 716 | dev_err(&dev->dev, |
| 717 | "%s: failed to allocate new slave device.\n", |
| 718 | __func__); |
| 719 | return -ENOMEM; |
| 720 | } |
| 721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
| 723 | sl->owner = THIS_MODULE; |
| 724 | sl->master = dev; |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 725 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 727 | memset(&msg, 0, sizeof(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 729 | atomic_set(&sl->refcnt, 1); |
| 730 | atomic_inc(&sl->master->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Hans-Frieder Vogt | bc04d76 | 2013-10-06 21:13:40 +0200 | [diff] [blame] | 732 | /* slave modules need to be loaded in a context with unlocked mutex */ |
| 733 | mutex_unlock(&dev->mutex); |
Alexander Stein | 8d7bda5 | 2013-05-26 20:06:50 +0200 | [diff] [blame] | 734 | request_module("w1-family-0x%0x", rn->family); |
Hans-Frieder Vogt | bc04d76 | 2013-10-06 21:13:40 +0200 | [diff] [blame] | 735 | mutex_lock(&dev->mutex); |
Alexander Stein | 8d7bda5 | 2013-05-26 20:06:50 +0200 | [diff] [blame] | 736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | spin_lock(&w1_flock); |
| 738 | f = w1_family_registered(rn->family); |
| 739 | if (!f) { |
Evgeniy Polyakov | 99c5bfe | 2005-06-04 01:31:26 +0400 | [diff] [blame] | 740 | f= &w1_default_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
| 742 | rn->family, rn->family, |
| 743 | (unsigned long long)rn->id, rn->crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
| 745 | __w1_family_get(f); |
| 746 | spin_unlock(&w1_flock); |
| 747 | |
| 748 | sl->family = f; |
| 749 | |
| 750 | |
| 751 | err = __w1_attach_slave_device(sl); |
| 752 | if (err < 0) { |
| 753 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, |
| 754 | sl->name); |
| 755 | w1_family_put(sl->family); |
| 756 | kfree(sl); |
| 757 | return err; |
| 758 | } |
| 759 | |
| 760 | sl->ttl = dev->slave_ttl; |
| 761 | dev->slave_count++; |
| 762 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 763 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | msg.type = W1_SLAVE_ADD; |
| 765 | w1_netlink_send(dev, &msg); |
| 766 | |
| 767 | return 0; |
| 768 | } |
| 769 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 770 | int w1_unref_slave(struct w1_slave *sl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 772 | struct w1_master *dev = sl->master; |
| 773 | int refcnt; |
| 774 | mutex_lock(&dev->list_mutex); |
| 775 | refcnt = atomic_sub_return(1, &sl->refcnt); |
| 776 | if (refcnt == 0) { |
| 777 | struct w1_netlink_msg msg; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 778 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 779 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, |
| 780 | sl->name, sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 782 | list_del(&sl->w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 784 | memset(&msg, 0, sizeof(msg)); |
| 785 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); |
| 786 | msg.type = W1_SLAVE_REMOVE; |
| 787 | w1_netlink_send(sl->master, &msg); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 788 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 789 | device_unregister(&sl->dev); |
| 790 | #ifdef DEBUG |
| 791 | memset(sl, 0, sizeof(*sl)); |
| 792 | #endif |
| 793 | kfree(sl); |
| 794 | } |
| 795 | atomic_dec(&dev->refcnt); |
| 796 | mutex_unlock(&dev->list_mutex); |
| 797 | return refcnt; |
| 798 | } |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 799 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 800 | int w1_slave_detach(struct w1_slave *sl) |
| 801 | { |
| 802 | /* Only detach a slave once as it decreases the refcnt each time. */ |
| 803 | int destroy_now; |
| 804 | mutex_lock(&sl->master->list_mutex); |
| 805 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); |
| 806 | set_bit(W1_SLAVE_DETACH, &sl->flags); |
| 807 | mutex_unlock(&sl->master->list_mutex); |
| 808 | |
| 809 | if (destroy_now) |
| 810 | destroy_now = !w1_unref_slave(sl); |
| 811 | return destroy_now ? 0 : -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 814 | struct w1_master *w1_search_master_id(u32 id) |
| 815 | { |
| 816 | struct w1_master *dev; |
| 817 | int found = 0; |
| 818 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 819 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 820 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
| 821 | if (dev->id == id) { |
| 822 | found = 1; |
| 823 | atomic_inc(&dev->refcnt); |
| 824 | break; |
| 825 | } |
| 826 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 827 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 828 | |
| 829 | return (found)?dev:NULL; |
| 830 | } |
| 831 | |
| 832 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) |
| 833 | { |
| 834 | struct w1_master *dev; |
| 835 | struct w1_slave *sl = NULL; |
| 836 | int found = 0; |
| 837 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 838 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 839 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 840 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 841 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 842 | if (sl->reg_num.family == id->family && |
| 843 | sl->reg_num.id == id->id && |
| 844 | sl->reg_num.crc == id->crc) { |
| 845 | found = 1; |
| 846 | atomic_inc(&dev->refcnt); |
| 847 | atomic_inc(&sl->refcnt); |
| 848 | break; |
| 849 | } |
| 850 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 851 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 852 | |
| 853 | if (found) |
| 854 | break; |
| 855 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 856 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 857 | |
| 858 | return (found)?sl:NULL; |
| 859 | } |
| 860 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 861 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 862 | { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 863 | struct w1_slave *sl, *sln; |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 864 | struct w1_master *dev; |
| 865 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 866 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 867 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 868 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 869 | "for family %02x.\n", dev->name, f->fid); |
| 870 | mutex_lock(&dev->mutex); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 871 | mutex_lock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 872 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
| 873 | /* If it is a new family, slaves with the default |
| 874 | * family driver and are that family will be |
| 875 | * connected. If the family is going away, devices |
| 876 | * matching that family are reconneced. |
| 877 | */ |
| 878 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT |
| 879 | && sl->reg_num.family == f->fid) || |
| 880 | (!attach && sl->family->fid == f->fid)) { |
| 881 | struct w1_reg_num rn; |
| 882 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 883 | mutex_unlock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 884 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 885 | /* If it was already in use let the automatic |
| 886 | * scan pick it up again later. |
| 887 | */ |
| 888 | if (!w1_slave_detach(sl)) |
| 889 | w1_attach_slave_device(dev, &rn); |
| 890 | mutex_lock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 891 | } |
| 892 | } |
| 893 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 894 | "has been finished.\n", dev->name); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 895 | mutex_unlock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 896 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 897 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 898 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 899 | } |
| 900 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 901 | void w1_slave_found(struct w1_master *dev, u64 rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | struct w1_slave *sl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | struct w1_reg_num *tmp; |
Evgeniy Polyakov | 0e65f82 | 2005-06-30 22:52:38 +0400 | [diff] [blame] | 905 | u64 rn_le = cpu_to_le64(rn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 907 | atomic_inc(&dev->refcnt); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | tmp = (struct w1_reg_num *) &rn; |
| 910 | |
David Fries | cd7b28d | 2008-10-15 22:04:44 -0700 | [diff] [blame] | 911 | sl = w1_slave_search_device(dev, tmp); |
| 912 | if (sl) { |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 913 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
David Fries | cd7b28d | 2008-10-15 22:04:44 -0700 | [diff] [blame] | 914 | } else { |
| 915 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) |
| 916 | w1_attach_slave_device(dev, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | } |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 918 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | atomic_dec(&dev->refcnt); |
| 920 | } |
| 921 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 922 | /** |
| 923 | * Performs a ROM Search & registers any devices found. |
| 924 | * The 1-wire search is a simple binary tree search. |
| 925 | * For each bit of the address, we read two bits and write one bit. |
| 926 | * The bit written will put to sleep all devies that don't match that bit. |
| 927 | * When the two reads differ, the direction choice is obvious. |
| 928 | * When both bits are 0, we must choose a path to take. |
| 929 | * When we can scan all 64 bits without having to choose a path, we are done. |
| 930 | * |
| 931 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com |
| 932 | * |
| 933 | * @dev The master device to search |
| 934 | * @cb Function to call when a device is found |
| 935 | */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 936 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 938 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 944 | search_bit = 0; |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 945 | rn = dev->search_id; |
| 946 | last_rn = 0; |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 947 | last_device = 0; |
| 948 | last_zero = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
| 950 | desc_bit = 64; |
| 951 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 952 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
| 953 | last_rn = rn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | rn = 0; |
| 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | /* |
| 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 | */ |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 962 | mutex_lock(&dev->bus_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | if (w1_reset_bus(dev)) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 964 | mutex_unlock(&dev->bus_mutex); |
Evgeniy Polyakov | 2da5bf8 | 2005-08-12 11:46:22 -0700 | [diff] [blame] | 965 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | break; |
| 967 | } |
| 968 | |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 969 | /* Do fast search on single slave bus */ |
| 970 | if (dev->max_slave_count == 1) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 971 | int rv; |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 972 | w1_write_8(dev, W1_READ_ROM); |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 973 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
| 974 | mutex_unlock(&dev->bus_mutex); |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 975 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 976 | if (rv == 8 && rn) |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 977 | cb(dev, rn); |
| 978 | |
| 979 | break; |
| 980 | } |
| 981 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 982 | /* Start the search */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 983 | w1_write_8(dev, search_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | for (i = 0; i < 64; ++i) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 985 | /* 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 993 | /** Read two bits and write one bit */ |
| 994 | triplet_ret = w1_triplet(dev, search_bit); |
| 995 | |
| 996 | /* quit if no device responded */ |
| 997 | if ( (triplet_ret & 0x03) == 0x03 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | break; |
| 999 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1000 | /* If both directions were valid, and we took the 0 path... */ |
| 1001 | if (triplet_ret == 0) |
| 1002 | last_zero = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1004 | /* extract the direction taken & update the device number */ |
| 1005 | tmp64 = (triplet_ret >> 2); |
| 1006 | rn |= (tmp64 << i); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 1007 | |
David Fries | 4210569 | 2014-01-15 22:29:13 -0600 | [diff] [blame] | 1008 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1009 | mutex_unlock(&dev->bus_mutex); |
David Fries | 7dc8f52 | 2008-10-15 22:04:58 -0700 | [diff] [blame] | 1010 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 1011 | return; |
| 1012 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | } |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1014 | mutex_unlock(&dev->bus_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1016 | if ( (triplet_ret & 0x03) != 0x03 ) { |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1017 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1018 | last_device = 1; |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1019 | dev->search_id = 0; |
| 1020 | } else { |
| 1021 | dev->search_id = rn; |
| 1022 | } |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1023 | desc_bit = last_zero; |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1024 | cb(dev, rn); |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1025 | } |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1026 | |
| 1027 | if (!last_device && slave_count == dev->max_slave_count && |
| 1028 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1029 | /* 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 Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1036 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1037 | "will continue next search.\n", __func__, |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1038 | dev->max_slave_count); |
| 1039 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); |
| 1040 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | } |
| 1042 | } |
| 1043 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1044 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
| 1045 | w1_slave_found_callback cb) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1046 | { |
| 1047 | struct w1_slave *sl, *sln; |
| 1048 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1049 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1050 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 1051 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1052 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1053 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1054 | w1_search_devices(dev, search_type, cb); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1055 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1056 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1057 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1058 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
| 1059 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1060 | w1_slave_detach(sl); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1061 | mutex_lock(&dev->list_mutex); |
| 1062 | } |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 1063 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1064 | sl->ttl = dev->slave_ttl; |
| 1065 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1066 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1067 | |
| 1068 | if (dev->search_count > 0) |
| 1069 | dev->search_count--; |
| 1070 | } |
| 1071 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1072 | static 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 Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1077 | int w1_process_callbacks(struct w1_master *dev) |
| 1078 | { |
| 1079 | int ret = 0; |
| 1080 | struct w1_async_cmd *async_cmd, *async_n; |
| 1081 | |
| 1082 | /* The list can be added to in another thread, loop until it is empty */ |
| 1083 | while (!list_empty(&dev->async_list)) { |
| 1084 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, |
| 1085 | async_entry) { |
| 1086 | /* drop the lock, if it is a search it can take a long |
| 1087 | * time */ |
| 1088 | mutex_unlock(&dev->list_mutex); |
| 1089 | async_cmd->cb(dev, async_cmd); |
| 1090 | ret = 1; |
| 1091 | mutex_lock(&dev->list_mutex); |
| 1092 | } |
| 1093 | } |
| 1094 | return ret; |
| 1095 | } |
| 1096 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | int w1_process(void *data) |
| 1098 | { |
| 1099 | struct w1_master *dev = (struct w1_master *) data; |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1100 | /* As long as w1_timeout is only set by a module parameter the sleep |
| 1101 | * time can be calculated in jiffies once. |
| 1102 | */ |
| 1103 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1104 | /* remainder if it woke up early */ |
| 1105 | unsigned long jremain = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1107 | for (;;) { |
| 1108 | |
| 1109 | if (!jremain && dev->search_count) { |
David Fries | 01e14d6 | 2008-10-15 22:04:40 -0700 | [diff] [blame] | 1110 | mutex_lock(&dev->mutex); |
| 1111 | w1_search_process(dev, W1_SEARCH); |
| 1112 | mutex_unlock(&dev->mutex); |
| 1113 | } |
| 1114 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1115 | mutex_lock(&dev->list_mutex); |
| 1116 | /* Note, w1_process_callback drops the lock while processing, |
| 1117 | * but locks it again before returning. |
| 1118 | */ |
| 1119 | if (!w1_process_callbacks(dev) && jremain) { |
| 1120 | /* a wake up is either to stop the thread, process |
| 1121 | * callbacks, or search, it isn't process callbacks, so |
| 1122 | * schedule a search. |
| 1123 | */ |
| 1124 | jremain = 1; |
| 1125 | } |
| 1126 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 1127 | try_to_freeze(); |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1128 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1129 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1130 | /* hold list_mutex until after interruptible to prevent loosing |
| 1131 | * the wakeup signal when async_cmd is added. |
| 1132 | */ |
| 1133 | mutex_unlock(&dev->list_mutex); |
| 1134 | |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1135 | if (kthread_should_stop()) |
| 1136 | break; |
| 1137 | |
| 1138 | /* Only sleep when the search is active. */ |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame^] | 1139 | if (dev->search_count) { |
| 1140 | if (!jremain) |
| 1141 | jremain = jtime; |
| 1142 | jremain = schedule_timeout(jremain); |
| 1143 | } |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1144 | else |
| 1145 | schedule(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | atomic_dec(&dev->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | |
| 1150 | return 0; |
| 1151 | } |
| 1152 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 1153 | static int __init w1_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | { |
| 1155 | int retval; |
| 1156 | |
| 1157 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); |
| 1158 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1159 | w1_init_netlink(); |
| 1160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | retval = bus_register(&w1_bus_type); |
| 1162 | if (retval) { |
| 1163 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); |
| 1164 | goto err_out_exit_init; |
| 1165 | } |
| 1166 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 1167 | retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb); |
| 1168 | if (retval) |
| 1169 | goto err_out_bus_unregister; |
| 1170 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1171 | retval = driver_register(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | if (retval) { |
| 1173 | printk(KERN_ERR |
| 1174 | "Failed to register master driver. err=%d.\n", |
| 1175 | retval); |
| 1176 | goto err_out_bus_unregister; |
| 1177 | } |
| 1178 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1179 | retval = driver_register(&w1_slave_driver); |
| 1180 | if (retval) { |
| 1181 | printk(KERN_ERR |
Dmitry Artamonow | ecf1948 | 2012-04-02 09:42:22 +0400 | [diff] [blame] | 1182 | "Failed to register slave driver. err=%d.\n", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1183 | retval); |
| 1184 | goto err_out_master_unregister; |
| 1185 | } |
| 1186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | return 0; |
| 1188 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1189 | #if 0 |
| 1190 | /* For undoing the slave register if there was a step after it. */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1191 | err_out_slave_unregister: |
| 1192 | driver_unregister(&w1_slave_driver); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1193 | #endif |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1194 | |
| 1195 | err_out_master_unregister: |
| 1196 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | err_out_bus_unregister: |
| 1199 | bus_unregister(&w1_bus_type); |
| 1200 | |
| 1201 | err_out_exit_init: |
| 1202 | return retval; |
| 1203 | } |
| 1204 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 1205 | static void __exit w1_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | { |
| 1207 | struct w1_master *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1209 | /* Set netlink removal messages and some cleanup */ |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 1210 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | __w1_remove_master_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1213 | w1_fini_netlink(); |
| 1214 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1215 | driver_unregister(&w1_slave_driver); |
| 1216 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | bus_unregister(&w1_bus_type); |
| 1218 | } |
| 1219 | |
| 1220 | module_init(w1_init); |
| 1221 | module_exit(w1_fini); |