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 | * |
| 4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> |
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 | |
| 36 | #include <asm/atomic.h> |
| 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"); |
| 45 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); |
| 46 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); |
| 47 | |
| 48 | static int w1_timeout = 10; |
| 49 | int w1_max_slave_count = 10; |
| 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 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 59 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
| 62 | { |
| 63 | return 1; |
| 64 | } |
| 65 | |
| 66 | static int w1_master_probe(struct device *dev) |
| 67 | { |
| 68 | return -ENODEV; |
| 69 | } |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | static void w1_master_release(struct device *dev) |
| 72 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 73 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 74 | |
| 75 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 76 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
| 77 | kfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | static void w1_slave_release(struct device *dev) |
| 81 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 82 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 83 | |
David Fries | 7dc8f52 | 2008-10-15 22:04:58 -0700 | [diff] [blame] | 84 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 85 | |
| 86 | while (atomic_read(&sl->refcnt)) { |
David Fries | 7dc8f52 | 2008-10-15 22:04:58 -0700 | [diff] [blame] | 87 | dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n", |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 88 | sl->name, atomic_read(&sl->refcnt)); |
| 89 | if (msleep_interruptible(1000)) |
| 90 | flush_signals(current); |
| 91 | } |
| 92 | |
| 93 | w1_family_put(sl->family); |
| 94 | sl->master->slave_count--; |
| 95 | |
| 96 | complete(&sl->released); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 99 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 101 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 102 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 103 | return sprintf(buf, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 106 | static ssize_t w1_slave_read_id(struct device *dev, |
| 107 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 109 | struct w1_slave *sl = dev_to_w1_slave(dev); |
| 110 | ssize_t count = sizeof(sl->reg_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 112 | memcpy(buf, (u8 *)&sl->reg_num, count); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 113 | return count; |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 114 | } |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 115 | |
| 116 | static struct device_attribute w1_slave_attr_name = |
| 117 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 118 | static struct device_attribute w1_slave_attr_id = |
| 119 | __ATTR(id, S_IRUGO, w1_slave_read_id, NULL); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 120 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 121 | /* Default family */ |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 122 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 123 | static ssize_t w1_default_write(struct file *filp, struct kobject *kobj, |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 124 | struct bin_attribute *bin_attr, |
| 125 | char *buf, loff_t off, size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 126 | { |
| 127 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 128 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 129 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 130 | if (w1_reset_select_slave(sl)) { |
| 131 | count = 0; |
| 132 | goto out_up; |
| 133 | } |
| 134 | |
| 135 | w1_write_block(sl->master, buf, count); |
| 136 | |
| 137 | out_up: |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 138 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 139 | return count; |
| 140 | } |
| 141 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 142 | static ssize_t w1_default_read(struct file *filp, struct kobject *kobj, |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 143 | struct bin_attribute *bin_attr, |
| 144 | char *buf, loff_t off, size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 145 | { |
| 146 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 147 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 148 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 149 | w1_read_block(sl->master, buf, count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 150 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 151 | return count; |
| 152 | } |
| 153 | |
| 154 | static struct bin_attribute w1_default_attr = { |
| 155 | .attr = { |
| 156 | .name = "rw", |
| 157 | .mode = S_IRUGO | S_IWUSR, |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 158 | }, |
| 159 | .size = PAGE_SIZE, |
| 160 | .read = w1_default_read, |
| 161 | .write = w1_default_write, |
| 162 | }; |
| 163 | |
| 164 | static int w1_default_add_slave(struct w1_slave *sl) |
| 165 | { |
| 166 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); |
| 167 | } |
| 168 | |
| 169 | static void w1_default_remove_slave(struct w1_slave *sl) |
| 170 | { |
| 171 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); |
| 172 | } |
| 173 | |
| 174 | static struct w1_family_ops w1_default_fops = { |
| 175 | .add_slave = w1_default_add_slave, |
| 176 | .remove_slave = w1_default_remove_slave, |
| 177 | }; |
| 178 | |
| 179 | static struct w1_family w1_default_family = { |
| 180 | .fops = &w1_default_fops, |
| 181 | }; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 182 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 183 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | static struct bus_type w1_bus_type = { |
| 186 | .name = "w1", |
| 187 | .match = w1_master_match, |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 188 | .uevent = w1_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | }; |
| 190 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 191 | struct device_driver w1_master_driver = { |
| 192 | .name = "w1_master_driver", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | .bus = &w1_bus_type, |
| 194 | .probe = w1_master_probe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | }; |
| 196 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 197 | struct device w1_master_device = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | .parent = NULL, |
| 199 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 200 | .init_name = "w1 bus master", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 201 | .driver = &w1_master_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | .release = &w1_master_release |
| 203 | }; |
| 204 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 205 | static struct device_driver w1_slave_driver = { |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 206 | .name = "w1_slave_driver", |
| 207 | .bus = &w1_bus_type, |
| 208 | }; |
| 209 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 210 | #if 0 |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 211 | struct device w1_slave_device = { |
| 212 | .parent = NULL, |
| 213 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 214 | .init_name = "w1 bus slave", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 215 | .driver = &w1_slave_driver, |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 216 | .release = &w1_slave_release |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 217 | }; |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 218 | #endif /* 0 */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 219 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 220 | 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] | 221 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 222 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 224 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 225 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | count = sprintf(buf, "%s\n", md->name); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 227 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
| 229 | return count; |
| 230 | } |
| 231 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 232 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
| 233 | struct device_attribute *attr, |
| 234 | const char * buf, size_t count) |
| 235 | { |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 236 | long tmp; |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 237 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 238 | |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 239 | if (strict_strtol(buf, 0, &tmp) == -EINVAL) |
| 240 | return -EINVAL; |
| 241 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 242 | mutex_lock(&md->mutex); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 243 | md->search_count = tmp; |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 244 | mutex_unlock(&md->mutex); |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 245 | wake_up_process(md->thread); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 246 | |
| 247 | return count; |
| 248 | } |
| 249 | |
| 250 | static ssize_t w1_master_attribute_show_search(struct device *dev, |
| 251 | struct device_attribute *attr, |
| 252 | char *buf) |
| 253 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 254 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 255 | ssize_t count; |
| 256 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 257 | mutex_lock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 258 | count = sprintf(buf, "%d\n", md->search_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 259 | mutex_unlock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 260 | |
| 261 | return count; |
| 262 | } |
| 263 | |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 264 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
| 265 | struct device_attribute *attr, |
| 266 | const char *buf, size_t count) |
| 267 | { |
| 268 | long tmp; |
| 269 | struct w1_master *md = dev_to_w1_master(dev); |
| 270 | |
| 271 | if (strict_strtol(buf, 0, &tmp) == -EINVAL) |
| 272 | return -EINVAL; |
| 273 | |
| 274 | mutex_lock(&md->mutex); |
| 275 | md->enable_pullup = tmp; |
| 276 | mutex_unlock(&md->mutex); |
| 277 | wake_up_process(md->thread); |
| 278 | |
| 279 | return count; |
| 280 | } |
| 281 | |
| 282 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, |
| 283 | struct device_attribute *attr, |
| 284 | char *buf) |
| 285 | { |
| 286 | struct w1_master *md = dev_to_w1_master(dev); |
| 287 | ssize_t count; |
| 288 | |
| 289 | mutex_lock(&md->mutex); |
| 290 | count = sprintf(buf, "%d\n", md->enable_pullup); |
| 291 | mutex_unlock(&md->mutex); |
| 292 | |
| 293 | return count; |
| 294 | } |
| 295 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 296 | 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] | 297 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 298 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 300 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 301 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | count = sprintf(buf, "0x%p\n", md->bus_master); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 303 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | return count; |
| 305 | } |
| 306 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 307 | 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] | 308 | { |
| 309 | ssize_t count; |
| 310 | count = sprintf(buf, "%d\n", w1_timeout); |
| 311 | return count; |
| 312 | } |
| 313 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 314 | 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] | 315 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 316 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 318 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 319 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | count = sprintf(buf, "%d\n", md->max_slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 321 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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_attempts(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, "%lu\n", md->attempts); |
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_slave_count(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, "%d\n", md->slave_count); |
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 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 347 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
| 348 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 350 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | int c = PAGE_SIZE; |
| 352 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 353 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
| 355 | if (md->slave_count == 0) |
| 356 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); |
| 357 | else { |
| 358 | struct list_head *ent, *n; |
| 359 | struct w1_slave *sl; |
| 360 | |
| 361 | list_for_each_safe(ent, n, &md->slist) { |
| 362 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
| 363 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 364 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
| 366 | } |
| 367 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 368 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | return PAGE_SIZE - c; |
| 371 | } |
| 372 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 373 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
| 374 | struct device_attribute *attr, char *buf) |
| 375 | { |
| 376 | int c = PAGE_SIZE; |
| 377 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 378 | "write device id xx-xxxxxxxxxxxx to add slave\n"); |
| 379 | return PAGE_SIZE - c; |
| 380 | } |
| 381 | |
| 382 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, |
| 383 | struct w1_reg_num *rn) |
| 384 | { |
| 385 | unsigned int family; |
| 386 | unsigned long long id; |
| 387 | int i; |
| 388 | u64 rn64_le; |
| 389 | |
| 390 | /* The CRC value isn't read from the user because the sysfs directory |
| 391 | * doesn't include it and most messages from the bus search don't |
| 392 | * print it either. It would be unreasonable for the user to then |
| 393 | * provide it. |
| 394 | */ |
| 395 | const char *error_msg = "bad slave string format, expecting " |
| 396 | "ff-dddddddddddd\n"; |
| 397 | |
| 398 | if (buf[2] != '-') { |
| 399 | dev_err(dev, "%s", error_msg); |
| 400 | return -EINVAL; |
| 401 | } |
| 402 | i = sscanf(buf, "%02x-%012llx", &family, &id); |
| 403 | if (i != 2) { |
| 404 | dev_err(dev, "%s", error_msg); |
| 405 | return -EINVAL; |
| 406 | } |
| 407 | rn->family = family; |
| 408 | rn->id = id; |
| 409 | |
| 410 | rn64_le = cpu_to_le64(*(u64 *)rn); |
| 411 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); |
| 412 | |
| 413 | #if 0 |
| 414 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", |
| 415 | rn->family, (unsigned long long)rn->id, rn->crc); |
| 416 | #endif |
| 417 | |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /* Searches the slaves in the w1_master and returns a pointer or NULL. |
| 422 | * Note: must hold the mutex |
| 423 | */ |
| 424 | static struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
| 425 | struct w1_reg_num *rn) |
| 426 | { |
| 427 | struct w1_slave *sl; |
| 428 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 429 | if (sl->reg_num.family == rn->family && |
| 430 | sl->reg_num.id == rn->id && |
| 431 | sl->reg_num.crc == rn->crc) { |
| 432 | return sl; |
| 433 | } |
| 434 | } |
| 435 | return NULL; |
| 436 | } |
| 437 | |
| 438 | static ssize_t w1_master_attribute_store_add(struct device *dev, |
| 439 | struct device_attribute *attr, |
| 440 | const char *buf, size_t count) |
| 441 | { |
| 442 | struct w1_master *md = dev_to_w1_master(dev); |
| 443 | struct w1_reg_num rn; |
| 444 | struct w1_slave *sl; |
| 445 | ssize_t result = count; |
| 446 | |
| 447 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 448 | return -EINVAL; |
| 449 | |
| 450 | mutex_lock(&md->mutex); |
| 451 | sl = w1_slave_search_device(md, &rn); |
| 452 | /* It would be nice to do a targeted search one the one-wire bus |
| 453 | * for the new device to see if it is out there or not. But the |
| 454 | * current search doesn't support that. |
| 455 | */ |
| 456 | if (sl) { |
| 457 | dev_info(dev, "Device %s already exists\n", sl->name); |
| 458 | result = -EINVAL; |
| 459 | } else { |
| 460 | w1_attach_slave_device(md, &rn); |
| 461 | } |
| 462 | mutex_unlock(&md->mutex); |
| 463 | |
| 464 | return result; |
| 465 | } |
| 466 | |
| 467 | static ssize_t w1_master_attribute_show_remove(struct device *dev, |
| 468 | struct device_attribute *attr, char *buf) |
| 469 | { |
| 470 | int c = PAGE_SIZE; |
| 471 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 472 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); |
| 473 | return PAGE_SIZE - c; |
| 474 | } |
| 475 | |
| 476 | static ssize_t w1_master_attribute_store_remove(struct device *dev, |
| 477 | struct device_attribute *attr, |
| 478 | const char *buf, size_t count) |
| 479 | { |
| 480 | struct w1_master *md = dev_to_w1_master(dev); |
| 481 | struct w1_reg_num rn; |
| 482 | struct w1_slave *sl; |
| 483 | ssize_t result = count; |
| 484 | |
| 485 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 486 | return -EINVAL; |
| 487 | |
| 488 | mutex_lock(&md->mutex); |
| 489 | sl = w1_slave_search_device(md, &rn); |
| 490 | if (sl) { |
| 491 | w1_slave_detach(sl); |
| 492 | } else { |
| 493 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, |
| 494 | (unsigned long long)rn.id); |
| 495 | result = -EINVAL; |
| 496 | } |
| 497 | mutex_unlock(&md->mutex); |
| 498 | |
| 499 | return result; |
| 500 | } |
| 501 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 502 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
| 503 | struct device_attribute w1_master_attribute_##_name = \ |
| 504 | __ATTR(w1_master_##_name, _mode, \ |
| 505 | w1_master_attribute_show_##_name, NULL) |
| 506 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 507 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
| 508 | struct device_attribute w1_master_attribute_##_name = \ |
| 509 | __ATTR(w1_master_##_name, _mode, \ |
| 510 | w1_master_attribute_show_##_name, \ |
| 511 | w1_master_attribute_store_##_name) |
| 512 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 513 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
| 514 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); |
| 515 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); |
| 516 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); |
| 517 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
| 518 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); |
| 519 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 520 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 521 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 522 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUGO); |
| 523 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUGO); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 524 | |
| 525 | static struct attribute *w1_master_default_attrs[] = { |
| 526 | &w1_master_attribute_name.attr, |
| 527 | &w1_master_attribute_slaves.attr, |
| 528 | &w1_master_attribute_slave_count.attr, |
| 529 | &w1_master_attribute_max_slave_count.attr, |
| 530 | &w1_master_attribute_attempts.attr, |
| 531 | &w1_master_attribute_timeout.attr, |
| 532 | &w1_master_attribute_pointer.attr, |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 533 | &w1_master_attribute_search.attr, |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 534 | &w1_master_attribute_pullup.attr, |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 535 | &w1_master_attribute_add.attr, |
| 536 | &w1_master_attribute_remove.attr, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 537 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | }; |
| 539 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 540 | static struct attribute_group w1_master_defattr_group = { |
| 541 | .attrs = w1_master_default_attrs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | }; |
| 543 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 544 | int w1_create_master_attributes(struct w1_master *master) |
| 545 | { |
| 546 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); |
| 547 | } |
| 548 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 549 | void w1_destroy_master_attributes(struct w1_master *master) |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 550 | { |
| 551 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); |
| 552 | } |
| 553 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 554 | #ifdef CONFIG_HOTPLUG |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 555 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 556 | { |
| 557 | struct w1_master *md = NULL; |
| 558 | struct w1_slave *sl = NULL; |
| 559 | char *event_owner, *name; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 560 | int err; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 561 | |
| 562 | if (dev->driver == &w1_master_driver) { |
| 563 | md = container_of(dev, struct w1_master, dev); |
| 564 | event_owner = "master"; |
| 565 | name = md->name; |
| 566 | } else if (dev->driver == &w1_slave_driver) { |
| 567 | sl = container_of(dev, struct w1_slave, dev); |
| 568 | event_owner = "slave"; |
| 569 | name = sl->name; |
| 570 | } else { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 571 | dev_dbg(dev, "Unknown event.\n"); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 572 | return -EINVAL; |
| 573 | } |
| 574 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 575 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 576 | event_owner, name, dev_name(dev)); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 577 | |
| 578 | if (dev->driver != &w1_slave_driver || !sl) |
| 579 | return 0; |
| 580 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 581 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 582 | if (err) |
| 583 | return err; |
| 584 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 585 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
| 586 | (unsigned long long)sl->reg_num.id); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 587 | if (err) |
| 588 | return err; |
| 589 | |
| 590 | return 0; |
| 591 | }; |
| 592 | #else |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 593 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 594 | { |
| 595 | return 0; |
| 596 | } |
| 597 | #endif |
| 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | static int __w1_attach_slave_device(struct w1_slave *sl) |
| 600 | { |
| 601 | int err; |
| 602 | |
| 603 | sl->dev.parent = &sl->master->dev; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 604 | sl->dev.driver = &w1_slave_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | sl->dev.bus = &w1_bus_type; |
| 606 | sl->dev.release = &w1_slave_release; |
| 607 | |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 608 | dev_set_name(&sl->dev, "%02x-%012llx", |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 609 | (unsigned int) sl->reg_num.family, |
| 610 | (unsigned long long) sl->reg_num.id); |
| 611 | snprintf(&sl->name[0], sizeof(sl->name), |
| 612 | "%02x-%012llx", |
| 613 | (unsigned int) sl->reg_num.family, |
| 614 | (unsigned long long) sl->reg_num.id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 616 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 617 | dev_name(&sl->dev), sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | err = device_register(&sl->dev); |
| 620 | if (err < 0) { |
| 621 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 622 | "Device registration [%s] failed. err=%d\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 623 | dev_name(&sl->dev), err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | return err; |
| 625 | } |
| 626 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 627 | /* Create "name" entry */ |
| 628 | err = device_create_file(&sl->dev, &w1_slave_attr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | if (err < 0) { |
| 630 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 631 | "sysfs file creation for [%s] failed. err=%d\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 632 | dev_name(&sl->dev), err); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 633 | goto out_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 636 | /* Create "id" entry */ |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 637 | err = device_create_file(&sl->dev, &w1_slave_attr_id); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 638 | if (err < 0) { |
| 639 | dev_err(&sl->dev, |
| 640 | "sysfs file creation for [%s] failed. err=%d\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 641 | dev_name(&sl->dev), err); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 642 | goto out_rem1; |
| 643 | } |
| 644 | |
| 645 | /* if the family driver needs to initialize something... */ |
| 646 | if (sl->family->fops && sl->family->fops->add_slave && |
| 647 | ((err = sl->family->fops->add_slave(sl)) < 0)) { |
| 648 | dev_err(&sl->dev, |
| 649 | "sysfs file creation for [%s] failed. err=%d\n", |
Kay Sievers | 40f91de | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 650 | dev_name(&sl->dev), err); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 651 | goto out_rem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
| 655 | |
| 656 | return 0; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 657 | |
| 658 | out_rem2: |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 659 | device_remove_file(&sl->dev, &w1_slave_attr_id); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 660 | out_rem1: |
| 661 | device_remove_file(&sl->dev, &w1_slave_attr_name); |
| 662 | out_unreg: |
| 663 | device_unregister(&sl->dev); |
| 664 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
| 668 | { |
| 669 | struct w1_slave *sl; |
| 670 | struct w1_family *f; |
| 671 | int err; |
| 672 | struct w1_netlink_msg msg; |
| 673 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 674 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | if (!sl) { |
| 676 | dev_err(&dev->dev, |
| 677 | "%s: failed to allocate new slave device.\n", |
| 678 | __func__); |
| 679 | return -ENOMEM; |
| 680 | } |
| 681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | sl->owner = THIS_MODULE; |
| 684 | sl->master = dev; |
| 685 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 686 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 687 | memset(&msg, 0, sizeof(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
| 689 | atomic_set(&sl->refcnt, 0); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 690 | init_completion(&sl->released); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | spin_lock(&w1_flock); |
| 693 | f = w1_family_registered(rn->family); |
| 694 | if (!f) { |
Evgeniy Polyakov | 99c5bfe | 2005-06-04 01:31:26 +0400 | [diff] [blame] | 695 | f= &w1_default_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
| 697 | rn->family, rn->family, |
| 698 | (unsigned long long)rn->id, rn->crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | __w1_family_get(f); |
| 701 | spin_unlock(&w1_flock); |
| 702 | |
| 703 | sl->family = f; |
| 704 | |
| 705 | |
| 706 | err = __w1_attach_slave_device(sl); |
| 707 | if (err < 0) { |
| 708 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, |
| 709 | sl->name); |
| 710 | w1_family_put(sl->family); |
| 711 | kfree(sl); |
| 712 | return err; |
| 713 | } |
| 714 | |
| 715 | sl->ttl = dev->slave_ttl; |
| 716 | dev->slave_count++; |
| 717 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 718 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | msg.type = W1_SLAVE_ADD; |
| 720 | w1_netlink_send(dev, &msg); |
| 721 | |
| 722 | return 0; |
| 723 | } |
| 724 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 725 | void w1_slave_detach(struct w1_slave *sl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | { |
| 727 | struct w1_netlink_msg msg; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 728 | |
Evgeniy Polyakov | 7c8f570 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 729 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 731 | list_del(&sl->w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 733 | if (sl->family->fops && sl->family->fops->remove_slave) |
| 734 | sl->family->fops->remove_slave(sl); |
| 735 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 736 | memset(&msg, 0, sizeof(msg)); |
| 737 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | msg.type = W1_SLAVE_REMOVE; |
| 739 | w1_netlink_send(sl->master, &msg); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 740 | |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 741 | device_remove_file(&sl->dev, &w1_slave_attr_id); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 742 | device_remove_file(&sl->dev, &w1_slave_attr_name); |
| 743 | device_unregister(&sl->dev); |
| 744 | |
| 745 | wait_for_completion(&sl->released); |
| 746 | kfree(sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
| 748 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 749 | struct w1_master *w1_search_master_id(u32 id) |
| 750 | { |
| 751 | struct w1_master *dev; |
| 752 | int found = 0; |
| 753 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 754 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 755 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
| 756 | if (dev->id == id) { |
| 757 | found = 1; |
| 758 | atomic_inc(&dev->refcnt); |
| 759 | break; |
| 760 | } |
| 761 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 762 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 763 | |
| 764 | return (found)?dev:NULL; |
| 765 | } |
| 766 | |
| 767 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) |
| 768 | { |
| 769 | struct w1_master *dev; |
| 770 | struct w1_slave *sl = NULL; |
| 771 | int found = 0; |
| 772 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 773 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 774 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 775 | mutex_lock(&dev->mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 776 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 777 | if (sl->reg_num.family == id->family && |
| 778 | sl->reg_num.id == id->id && |
| 779 | sl->reg_num.crc == id->crc) { |
| 780 | found = 1; |
| 781 | atomic_inc(&dev->refcnt); |
| 782 | atomic_inc(&sl->refcnt); |
| 783 | break; |
| 784 | } |
| 785 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 786 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 787 | |
| 788 | if (found) |
| 789 | break; |
| 790 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 791 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 792 | |
| 793 | return (found)?sl:NULL; |
| 794 | } |
| 795 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 796 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 797 | { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 798 | struct w1_slave *sl, *sln; |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 799 | struct w1_master *dev; |
| 800 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 801 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 802 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 803 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 804 | "for family %02x.\n", dev->name, f->fid); |
| 805 | mutex_lock(&dev->mutex); |
| 806 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
| 807 | /* If it is a new family, slaves with the default |
| 808 | * family driver and are that family will be |
| 809 | * connected. If the family is going away, devices |
| 810 | * matching that family are reconneced. |
| 811 | */ |
| 812 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT |
| 813 | && sl->reg_num.family == f->fid) || |
| 814 | (!attach && sl->family->fid == f->fid)) { |
| 815 | struct w1_reg_num rn; |
| 816 | |
| 817 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
| 818 | w1_slave_detach(sl); |
| 819 | |
| 820 | w1_attach_slave_device(dev, &rn); |
| 821 | } |
| 822 | } |
| 823 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 824 | "has been finished.\n", dev->name); |
| 825 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 826 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 827 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 828 | } |
| 829 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 830 | static void w1_slave_found(struct w1_master *dev, u64 rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | struct w1_slave *sl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | struct w1_reg_num *tmp; |
Evgeniy Polyakov | 0e65f82 | 2005-06-30 22:52:38 +0400 | [diff] [blame] | 834 | u64 rn_le = cpu_to_le64(rn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 836 | atomic_inc(&dev->refcnt); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | tmp = (struct w1_reg_num *) &rn; |
| 839 | |
David Fries | cd7b28d | 2008-10-15 22:04:44 -0700 | [diff] [blame] | 840 | sl = w1_slave_search_device(dev, tmp); |
| 841 | if (sl) { |
| 842 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 843 | } else { |
| 844 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) |
| 845 | w1_attach_slave_device(dev, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | atomic_dec(&dev->refcnt); |
| 849 | } |
| 850 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 851 | /** |
| 852 | * Performs a ROM Search & registers any devices found. |
| 853 | * The 1-wire search is a simple binary tree search. |
| 854 | * For each bit of the address, we read two bits and write one bit. |
| 855 | * The bit written will put to sleep all devies that don't match that bit. |
| 856 | * When the two reads differ, the direction choice is obvious. |
| 857 | * When both bits are 0, we must choose a path to take. |
| 858 | * When we can scan all 64 bits without having to choose a path, we are done. |
| 859 | * |
| 860 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com |
| 861 | * |
| 862 | * @dev The master device to search |
| 863 | * @cb Function to call when a device is found |
| 864 | */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 865 | 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] | 866 | { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 867 | u64 last_rn, rn, tmp64; |
| 868 | int i, slave_count = 0; |
| 869 | int last_zero, last_device; |
| 870 | int search_bit, desc_bit; |
| 871 | u8 triplet_ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 873 | search_bit = 0; |
| 874 | rn = last_rn = 0; |
| 875 | last_device = 0; |
| 876 | last_zero = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
| 878 | desc_bit = 64; |
| 879 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 880 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
| 881 | last_rn = rn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | rn = 0; |
| 883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | /* |
| 885 | * Reset bus and all 1-wire device state machines |
| 886 | * so they can respond to our requests. |
| 887 | * |
| 888 | * Return 0 - device(s) present, 1 - no devices present. |
| 889 | */ |
| 890 | if (w1_reset_bus(dev)) { |
Evgeniy Polyakov | 2da5bf8 | 2005-08-12 11:46:22 -0700 | [diff] [blame] | 891 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | break; |
| 893 | } |
| 894 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 895 | /* Start the search */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 896 | w1_write_8(dev, search_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | for (i = 0; i < 64; ++i) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 898 | /* Determine the direction/search bit */ |
| 899 | if (i == desc_bit) |
| 900 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ |
| 901 | else if (i > desc_bit) |
| 902 | search_bit = 0; /* take the 0 path on the next branch */ |
| 903 | else |
| 904 | search_bit = ((last_rn >> i) & 0x1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 906 | /** Read two bits and write one bit */ |
| 907 | triplet_ret = w1_triplet(dev, search_bit); |
| 908 | |
| 909 | /* quit if no device responded */ |
| 910 | if ( (triplet_ret & 0x03) == 0x03 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | break; |
| 912 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 913 | /* If both directions were valid, and we took the 0 path... */ |
| 914 | if (triplet_ret == 0) |
| 915 | last_zero = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 917 | /* extract the direction taken & update the device number */ |
| 918 | tmp64 = (triplet_ret >> 2); |
| 919 | rn |= (tmp64 << i); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 920 | |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 921 | if (kthread_should_stop()) { |
David Fries | 7dc8f52 | 2008-10-15 22:04:58 -0700 | [diff] [blame] | 922 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 923 | return; |
| 924 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 927 | if ( (triplet_ret & 0x03) != 0x03 ) { |
| 928 | if ( (desc_bit == last_zero) || (last_zero < 0)) |
| 929 | last_device = 1; |
| 930 | desc_bit = last_zero; |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 931 | cb(dev, rn); |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | } |
| 935 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 936 | void w1_search_process(struct w1_master *dev, u8 search_type) |
| 937 | { |
| 938 | struct w1_slave *sl, *sln; |
| 939 | |
| 940 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
| 941 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 942 | |
| 943 | w1_search_devices(dev, search_type, w1_slave_found); |
| 944 | |
| 945 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
Evgeniy Polyakov | a2a6c74 | 2008-01-14 00:55:08 -0800 | [diff] [blame] | 946 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 947 | w1_slave_detach(sl); |
Evgeniy Polyakov | a2a6c74 | 2008-01-14 00:55:08 -0800 | [diff] [blame] | 948 | else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 949 | sl->ttl = dev->slave_ttl; |
| 950 | } |
| 951 | |
| 952 | if (dev->search_count > 0) |
| 953 | dev->search_count--; |
| 954 | } |
| 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | int w1_process(void *data) |
| 957 | { |
| 958 | struct w1_master *dev = (struct w1_master *) data; |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 959 | /* As long as w1_timeout is only set by a module parameter the sleep |
| 960 | * time can be calculated in jiffies once. |
| 961 | */ |
| 962 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 964 | while (!kthread_should_stop()) { |
David Fries | 01e14d6 | 2008-10-15 22:04:40 -0700 | [diff] [blame] | 965 | if (dev->search_count) { |
| 966 | mutex_lock(&dev->mutex); |
| 967 | w1_search_process(dev, W1_SEARCH); |
| 968 | mutex_unlock(&dev->mutex); |
| 969 | } |
| 970 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 971 | try_to_freeze(); |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 972 | __set_current_state(TASK_INTERRUPTIBLE); |
| 973 | |
| 974 | if (kthread_should_stop()) |
| 975 | break; |
| 976 | |
| 977 | /* Only sleep when the search is active. */ |
| 978 | if (dev->search_count) |
| 979 | schedule_timeout(jtime); |
| 980 | else |
| 981 | schedule(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | } |
| 983 | |
| 984 | atomic_dec(&dev->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
| 986 | return 0; |
| 987 | } |
| 988 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 989 | static int __init w1_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
| 991 | int retval; |
| 992 | |
| 993 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); |
| 994 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 995 | w1_init_netlink(); |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | retval = bus_register(&w1_bus_type); |
| 998 | if (retval) { |
| 999 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); |
| 1000 | goto err_out_exit_init; |
| 1001 | } |
| 1002 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1003 | retval = driver_register(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | if (retval) { |
| 1005 | printk(KERN_ERR |
| 1006 | "Failed to register master driver. err=%d.\n", |
| 1007 | retval); |
| 1008 | goto err_out_bus_unregister; |
| 1009 | } |
| 1010 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1011 | retval = driver_register(&w1_slave_driver); |
| 1012 | if (retval) { |
| 1013 | printk(KERN_ERR |
| 1014 | "Failed to register master driver. err=%d.\n", |
| 1015 | retval); |
| 1016 | goto err_out_master_unregister; |
| 1017 | } |
| 1018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return 0; |
| 1020 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1021 | #if 0 |
| 1022 | /* For undoing the slave register if there was a step after it. */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1023 | err_out_slave_unregister: |
| 1024 | driver_unregister(&w1_slave_driver); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1025 | #endif |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1026 | |
| 1027 | err_out_master_unregister: |
| 1028 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | err_out_bus_unregister: |
| 1031 | bus_unregister(&w1_bus_type); |
| 1032 | |
| 1033 | err_out_exit_init: |
| 1034 | return retval; |
| 1035 | } |
| 1036 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 1037 | static void __exit w1_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | { |
| 1039 | struct w1_master *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1041 | /* Set netlink removal messages and some cleanup */ |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 1042 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | __w1_remove_master_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1045 | w1_fini_netlink(); |
| 1046 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1047 | driver_unregister(&w1_slave_driver); |
| 1048 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | bus_unregister(&w1_bus_type); |
| 1050 | } |
| 1051 | |
| 1052 | module_init(w1_init); |
| 1053 | module_exit(w1_fini); |