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 | 674a396 | 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; |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 49 | static int w1_control_timeout = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | int w1_max_slave_count = 10; |
| 51 | int w1_max_slave_ttl = 10; |
| 52 | |
| 53 | module_param_named(timeout, w1_timeout, int, 0); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 54 | module_param_named(control_timeout, w1_control_timeout, int, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
| 56 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
| 57 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 58 | DEFINE_MUTEX(w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | LIST_HEAD(w1_masters); |
| 60 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 61 | static struct task_struct *w1_control_thread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
| 64 | { |
| 65 | return 1; |
| 66 | } |
| 67 | |
| 68 | static int w1_master_probe(struct device *dev) |
| 69 | { |
| 70 | return -ENODEV; |
| 71 | } |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | static void w1_master_release(struct device *dev) |
| 74 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 75 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 76 | |
| 77 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 78 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
| 79 | kfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static void w1_slave_release(struct device *dev) |
| 83 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 84 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 85 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 86 | printk("%s: Releasing %s.\n", __func__, sl->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 87 | |
| 88 | while (atomic_read(&sl->refcnt)) { |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 89 | printk("Waiting for %s to become free: refcnt=%d.\n", |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 90 | sl->name, atomic_read(&sl->refcnt)); |
| 91 | if (msleep_interruptible(1000)) |
| 92 | flush_signals(current); |
| 93 | } |
| 94 | |
| 95 | w1_family_put(sl->family); |
| 96 | sl->master->slave_count--; |
| 97 | |
| 98 | complete(&sl->released); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 101 | 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] | 102 | { |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 103 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 104 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 105 | return sprintf(buf, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 108 | static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 110 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 112 | if (off > 8) { |
| 113 | count = 0; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 114 | } else { |
| 115 | if (off + count > 8) |
| 116 | count = 8 - off; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 117 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 118 | memcpy(buf, (u8 *)&sl->reg_num, count); |
| 119 | } |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 120 | |
| 121 | return count; |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 122 | } |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 123 | |
| 124 | static struct device_attribute w1_slave_attr_name = |
| 125 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); |
| 126 | |
| 127 | static struct bin_attribute w1_slave_attr_bin_id = { |
| 128 | .attr = { |
| 129 | .name = "id", |
| 130 | .mode = S_IRUGO, |
| 131 | .owner = THIS_MODULE, |
| 132 | }, |
| 133 | .size = 8, |
| 134 | .read = w1_slave_read_id, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 135 | }; |
| 136 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 137 | /* Default family */ |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 138 | |
| 139 | static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, size_t count) |
| 140 | { |
| 141 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 142 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 143 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 144 | if (w1_reset_select_slave(sl)) { |
| 145 | count = 0; |
| 146 | goto out_up; |
| 147 | } |
| 148 | |
| 149 | w1_write_block(sl->master, buf, count); |
| 150 | |
| 151 | out_up: |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 152 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 153 | return count; |
| 154 | } |
| 155 | |
| 156 | static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count) |
| 157 | { |
| 158 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 159 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 160 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 161 | w1_read_block(sl->master, buf, count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 162 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 163 | return count; |
| 164 | } |
| 165 | |
| 166 | static struct bin_attribute w1_default_attr = { |
| 167 | .attr = { |
| 168 | .name = "rw", |
| 169 | .mode = S_IRUGO | S_IWUSR, |
| 170 | .owner = THIS_MODULE, |
| 171 | }, |
| 172 | .size = PAGE_SIZE, |
| 173 | .read = w1_default_read, |
| 174 | .write = w1_default_write, |
| 175 | }; |
| 176 | |
| 177 | static int w1_default_add_slave(struct w1_slave *sl) |
| 178 | { |
| 179 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); |
| 180 | } |
| 181 | |
| 182 | static void w1_default_remove_slave(struct w1_slave *sl) |
| 183 | { |
| 184 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); |
| 185 | } |
| 186 | |
| 187 | static struct w1_family_ops w1_default_fops = { |
| 188 | .add_slave = w1_default_add_slave, |
| 189 | .remove_slave = w1_default_remove_slave, |
| 190 | }; |
| 191 | |
| 192 | static struct w1_family w1_default_family = { |
| 193 | .fops = &w1_default_fops, |
| 194 | }; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 195 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 196 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | static struct bus_type w1_bus_type = { |
| 199 | .name = "w1", |
| 200 | .match = w1_master_match, |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 201 | .uevent = w1_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | }; |
| 203 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 204 | struct device_driver w1_master_driver = { |
| 205 | .name = "w1_master_driver", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | .bus = &w1_bus_type, |
| 207 | .probe = w1_master_probe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 210 | struct device w1_master_device = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | .parent = NULL, |
| 212 | .bus = &w1_bus_type, |
| 213 | .bus_id = "w1 bus master", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 214 | .driver = &w1_master_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | .release = &w1_master_release |
| 216 | }; |
| 217 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 218 | static struct device_driver w1_slave_driver = { |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 219 | .name = "w1_slave_driver", |
| 220 | .bus = &w1_bus_type, |
| 221 | }; |
| 222 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 223 | #if 0 |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 224 | struct device w1_slave_device = { |
| 225 | .parent = NULL, |
| 226 | .bus = &w1_bus_type, |
| 227 | .bus_id = "w1 bus slave", |
| 228 | .driver = &w1_slave_driver, |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 229 | .release = &w1_slave_release |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 230 | }; |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 231 | #endif /* 0 */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 232 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 233 | 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] | 234 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 235 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 237 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 238 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | count = sprintf(buf, "%s\n", md->name); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 240 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | return count; |
| 243 | } |
| 244 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 245 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
| 246 | struct device_attribute *attr, |
| 247 | const char * buf, size_t count) |
| 248 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 249 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 250 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 251 | mutex_lock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 252 | md->search_count = simple_strtol(buf, NULL, 0); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 253 | mutex_unlock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 254 | |
| 255 | return count; |
| 256 | } |
| 257 | |
| 258 | static ssize_t w1_master_attribute_show_search(struct device *dev, |
| 259 | struct device_attribute *attr, |
| 260 | char *buf) |
| 261 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 262 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 263 | ssize_t count; |
| 264 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 265 | mutex_lock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 266 | count = sprintf(buf, "%d\n", md->search_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 267 | mutex_unlock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 268 | |
| 269 | return count; |
| 270 | } |
| 271 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 272 | 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] | 273 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 274 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 276 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 277 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | count = sprintf(buf, "0x%p\n", md->bus_master); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 279 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | return count; |
| 281 | } |
| 282 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 283 | 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] | 284 | { |
| 285 | ssize_t count; |
| 286 | count = sprintf(buf, "%d\n", w1_timeout); |
| 287 | return count; |
| 288 | } |
| 289 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 290 | 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] | 291 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 292 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 294 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 295 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | count = sprintf(buf, "%d\n", md->max_slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 297 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | return count; |
| 299 | } |
| 300 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 301 | 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] | 302 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 303 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 305 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 306 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | count = sprintf(buf, "%lu\n", md->attempts); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 308 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | return count; |
| 310 | } |
| 311 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 312 | 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] | 313 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 314 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 316 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 317 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | count = sprintf(buf, "%d\n", md->slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 319 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | return count; |
| 321 | } |
| 322 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 323 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 325 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | int c = PAGE_SIZE; |
| 327 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 328 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | if (md->slave_count == 0) |
| 331 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); |
| 332 | else { |
| 333 | struct list_head *ent, *n; |
| 334 | struct w1_slave *sl; |
| 335 | |
| 336 | list_for_each_safe(ent, n, &md->slist) { |
| 337 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
| 338 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 339 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | |
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 | |
| 345 | return PAGE_SIZE - c; |
| 346 | } |
| 347 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 348 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
| 349 | struct device_attribute w1_master_attribute_##_name = \ |
| 350 | __ATTR(w1_master_##_name, _mode, \ |
| 351 | w1_master_attribute_show_##_name, NULL) |
| 352 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 353 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
| 354 | struct device_attribute w1_master_attribute_##_name = \ |
| 355 | __ATTR(w1_master_##_name, _mode, \ |
| 356 | w1_master_attribute_show_##_name, \ |
| 357 | w1_master_attribute_store_##_name) |
| 358 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 359 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
| 360 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); |
| 361 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); |
| 362 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); |
| 363 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
| 364 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); |
| 365 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 366 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 367 | |
| 368 | static struct attribute *w1_master_default_attrs[] = { |
| 369 | &w1_master_attribute_name.attr, |
| 370 | &w1_master_attribute_slaves.attr, |
| 371 | &w1_master_attribute_slave_count.attr, |
| 372 | &w1_master_attribute_max_slave_count.attr, |
| 373 | &w1_master_attribute_attempts.attr, |
| 374 | &w1_master_attribute_timeout.attr, |
| 375 | &w1_master_attribute_pointer.attr, |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 376 | &w1_master_attribute_search.attr, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 377 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | }; |
| 379 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 380 | static struct attribute_group w1_master_defattr_group = { |
| 381 | .attrs = w1_master_default_attrs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | }; |
| 383 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 384 | int w1_create_master_attributes(struct w1_master *master) |
| 385 | { |
| 386 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); |
| 387 | } |
| 388 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 389 | static void w1_destroy_master_attributes(struct w1_master *master) |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 390 | { |
| 391 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); |
| 392 | } |
| 393 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 394 | #ifdef CONFIG_HOTPLUG |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 395 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
| 396 | char *buffer, int buffer_size) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 397 | { |
| 398 | struct w1_master *md = NULL; |
| 399 | struct w1_slave *sl = NULL; |
| 400 | char *event_owner, *name; |
| 401 | int err, cur_index=0, cur_len=0; |
| 402 | |
| 403 | if (dev->driver == &w1_master_driver) { |
| 404 | md = container_of(dev, struct w1_master, dev); |
| 405 | event_owner = "master"; |
| 406 | name = md->name; |
| 407 | } else if (dev->driver == &w1_slave_driver) { |
| 408 | sl = container_of(dev, struct w1_slave, dev); |
| 409 | event_owner = "slave"; |
| 410 | name = sl->name; |
| 411 | } else { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 412 | dev_dbg(dev, "Unknown event.\n"); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 413 | return -EINVAL; |
| 414 | } |
| 415 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 416 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
| 417 | event_owner, name, dev->bus_id); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 418 | |
| 419 | if (dev->driver != &w1_slave_driver || !sl) |
| 420 | return 0; |
| 421 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 422 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
| 423 | &cur_len, "W1_FID=%02X", sl->reg_num.family); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 424 | if (err) |
| 425 | return err; |
| 426 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 427 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
| 428 | &cur_len, "W1_SLAVE_ID=%024LX", |
| 429 | (unsigned long long)sl->reg_num.id); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 430 | if (err) |
| 431 | return err; |
| 432 | |
| 433 | return 0; |
| 434 | }; |
| 435 | #else |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 436 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
| 437 | char *buffer, int buffer_size) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 438 | { |
| 439 | return 0; |
| 440 | } |
| 441 | #endif |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | static int __w1_attach_slave_device(struct w1_slave *sl) |
| 444 | { |
| 445 | int err; |
| 446 | |
| 447 | sl->dev.parent = &sl->master->dev; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 448 | sl->dev.driver = &w1_slave_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | sl->dev.bus = &w1_bus_type; |
| 450 | sl->dev.release = &w1_slave_release; |
| 451 | |
| 452 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 453 | "%02x-%012llx", |
| 454 | (unsigned int) sl->reg_num.family, |
| 455 | (unsigned long long) sl->reg_num.id); |
| 456 | snprintf(&sl->name[0], sizeof(sl->name), |
| 457 | "%02x-%012llx", |
| 458 | (unsigned int) sl->reg_num.family, |
| 459 | (unsigned long long) sl->reg_num.id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 461 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
| 462 | &sl->dev.bus_id[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | err = device_register(&sl->dev); |
| 465 | if (err < 0) { |
| 466 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 467 | "Device registration [%s] failed. err=%d\n", |
| 468 | sl->dev.bus_id, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | return err; |
| 470 | } |
| 471 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 472 | /* Create "name" entry */ |
| 473 | err = device_create_file(&sl->dev, &w1_slave_attr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (err < 0) { |
| 475 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 476 | "sysfs file creation for [%s] failed. err=%d\n", |
| 477 | sl->dev.bus_id, err); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 478 | goto out_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 481 | /* Create "id" entry */ |
| 482 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
| 483 | if (err < 0) { |
| 484 | dev_err(&sl->dev, |
| 485 | "sysfs file creation for [%s] failed. err=%d\n", |
| 486 | sl->dev.bus_id, err); |
| 487 | goto out_rem1; |
| 488 | } |
| 489 | |
| 490 | /* if the family driver needs to initialize something... */ |
| 491 | if (sl->family->fops && sl->family->fops->add_slave && |
| 492 | ((err = sl->family->fops->add_slave(sl)) < 0)) { |
| 493 | dev_err(&sl->dev, |
| 494 | "sysfs file creation for [%s] failed. err=%d\n", |
| 495 | sl->dev.bus_id, err); |
| 496 | goto out_rem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
| 500 | |
| 501 | return 0; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 502 | |
| 503 | out_rem2: |
| 504 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
| 505 | out_rem1: |
| 506 | device_remove_file(&sl->dev, &w1_slave_attr_name); |
| 507 | out_unreg: |
| 508 | device_unregister(&sl->dev); |
| 509 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
| 513 | { |
| 514 | struct w1_slave *sl; |
| 515 | struct w1_family *f; |
| 516 | int err; |
| 517 | struct w1_netlink_msg msg; |
| 518 | |
| 519 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); |
| 520 | if (!sl) { |
| 521 | dev_err(&dev->dev, |
| 522 | "%s: failed to allocate new slave device.\n", |
| 523 | __func__); |
| 524 | return -ENOMEM; |
| 525 | } |
| 526 | |
| 527 | memset(sl, 0, sizeof(*sl)); |
| 528 | |
| 529 | sl->owner = THIS_MODULE; |
| 530 | sl->master = dev; |
| 531 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 532 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 533 | memset(&msg, 0, sizeof(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
| 535 | atomic_set(&sl->refcnt, 0); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 536 | init_completion(&sl->released); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | spin_lock(&w1_flock); |
| 539 | f = w1_family_registered(rn->family); |
| 540 | if (!f) { |
Evgeniy Polyakov | 99c5bfe | 2005-06-04 01:31:26 +0400 | [diff] [blame] | 541 | f= &w1_default_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
| 543 | rn->family, rn->family, |
| 544 | (unsigned long long)rn->id, rn->crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | __w1_family_get(f); |
| 547 | spin_unlock(&w1_flock); |
| 548 | |
| 549 | sl->family = f; |
| 550 | |
| 551 | |
| 552 | err = __w1_attach_slave_device(sl); |
| 553 | if (err < 0) { |
| 554 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, |
| 555 | sl->name); |
| 556 | w1_family_put(sl->family); |
| 557 | kfree(sl); |
| 558 | return err; |
| 559 | } |
| 560 | |
| 561 | sl->ttl = dev->slave_ttl; |
| 562 | dev->slave_count++; |
| 563 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 564 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | msg.type = W1_SLAVE_ADD; |
| 566 | w1_netlink_send(dev, &msg); |
| 567 | |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static void w1_slave_detach(struct w1_slave *sl) |
| 572 | { |
| 573 | struct w1_netlink_msg msg; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 574 | |
Evgeniy Polyakov | 7c8f570 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 575 | 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] | 576 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 577 | list_del(&sl->w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 579 | if (sl->family->fops && sl->family->fops->remove_slave) |
| 580 | sl->family->fops->remove_slave(sl); |
| 581 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 582 | memset(&msg, 0, sizeof(msg)); |
| 583 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | msg.type = W1_SLAVE_REMOVE; |
| 585 | w1_netlink_send(sl->master, &msg); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 586 | |
| 587 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
| 588 | device_remove_file(&sl->dev, &w1_slave_attr_name); |
| 589 | device_unregister(&sl->dev); |
| 590 | |
| 591 | wait_for_completion(&sl->released); |
| 592 | kfree(sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Evgeniy Polyakov | ccd6994 | 2005-12-06 13:38:27 +0300 | [diff] [blame] | 595 | static struct w1_master *w1_search_master(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | { |
| 597 | struct w1_master *dev; |
| 598 | int found = 0; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 599 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 600 | mutex_lock(&w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
| 602 | if (dev->bus_master->data == data) { |
| 603 | found = 1; |
| 604 | atomic_inc(&dev->refcnt); |
| 605 | break; |
| 606 | } |
| 607 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 608 | mutex_unlock(&w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | return (found)?dev:NULL; |
| 611 | } |
| 612 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 613 | struct w1_master *w1_search_master_id(u32 id) |
| 614 | { |
| 615 | struct w1_master *dev; |
| 616 | int found = 0; |
| 617 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 618 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 619 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
| 620 | if (dev->id == id) { |
| 621 | found = 1; |
| 622 | atomic_inc(&dev->refcnt); |
| 623 | break; |
| 624 | } |
| 625 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 626 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 627 | |
| 628 | return (found)?dev:NULL; |
| 629 | } |
| 630 | |
| 631 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) |
| 632 | { |
| 633 | struct w1_master *dev; |
| 634 | struct w1_slave *sl = NULL; |
| 635 | int found = 0; |
| 636 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 637 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 638 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 639 | mutex_lock(&dev->mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 640 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 641 | if (sl->reg_num.family == id->family && |
| 642 | sl->reg_num.id == id->id && |
| 643 | sl->reg_num.crc == id->crc) { |
| 644 | found = 1; |
| 645 | atomic_inc(&dev->refcnt); |
| 646 | atomic_inc(&sl->refcnt); |
| 647 | break; |
| 648 | } |
| 649 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 650 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 651 | |
| 652 | if (found) |
| 653 | break; |
| 654 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 655 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 656 | |
| 657 | return (found)?sl:NULL; |
| 658 | } |
| 659 | |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 660 | void w1_reconnect_slaves(struct w1_family *f) |
| 661 | { |
| 662 | struct w1_master *dev; |
| 663 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 664 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 665 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
Evgeniy Polyakov | 7c8f570 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 666 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 667 | dev->name, f->fid); |
| 668 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
| 669 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 670 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 671 | } |
| 672 | |
Evgeniy Polyakov | ccd6994 | 2005-12-06 13:38:27 +0300 | [diff] [blame] | 673 | static void w1_slave_found(void *data, u64 rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
| 675 | int slave_count; |
| 676 | struct w1_slave *sl; |
| 677 | struct list_head *ent; |
| 678 | struct w1_reg_num *tmp; |
| 679 | int family_found = 0; |
| 680 | struct w1_master *dev; |
Evgeniy Polyakov | 0e65f82 | 2005-06-30 22:52:38 +0400 | [diff] [blame] | 681 | u64 rn_le = cpu_to_le64(rn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | dev = w1_search_master(data); |
| 684 | if (!dev) { |
Evgeniy Polyakov | ccd6994 | 2005-12-06 13:38:27 +0300 | [diff] [blame] | 685 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
| 686 | "it is impossible.\n", data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | return; |
| 688 | } |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | tmp = (struct w1_reg_num *) &rn; |
| 691 | |
| 692 | slave_count = 0; |
| 693 | list_for_each(ent, &dev->slist) { |
| 694 | |
| 695 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
| 696 | |
| 697 | if (sl->reg_num.family == tmp->family && |
| 698 | sl->reg_num.id == tmp->id && |
| 699 | sl->reg_num.crc == tmp->crc) { |
| 700 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 701 | break; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 702 | } else if (sl->reg_num.family == tmp->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | family_found = 1; |
| 704 | break; |
| 705 | } |
| 706 | |
| 707 | slave_count++; |
| 708 | } |
| 709 | |
johnpol@2ka.mipt.ru | 8523ff4 | 2005-04-18 21:16:57 -0700 | [diff] [blame] | 710 | if (slave_count == dev->slave_count && |
Evgeniy Polyakov | 0e65f82 | 2005-06-30 22:52:38 +0400 | [diff] [blame] | 711 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
johnpol@2ka.mipt.ru | 8523ff4 | 2005-04-18 21:16:57 -0700 | [diff] [blame] | 712 | w1_attach_slave_device(dev, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | atomic_dec(&dev->refcnt); |
| 716 | } |
| 717 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 718 | /** |
| 719 | * Performs a ROM Search & registers any devices found. |
| 720 | * The 1-wire search is a simple binary tree search. |
| 721 | * For each bit of the address, we read two bits and write one bit. |
| 722 | * The bit written will put to sleep all devies that don't match that bit. |
| 723 | * When the two reads differ, the direction choice is obvious. |
| 724 | * When both bits are 0, we must choose a path to take. |
| 725 | * When we can scan all 64 bits without having to choose a path, we are done. |
| 726 | * |
| 727 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com |
| 728 | * |
| 729 | * @dev The master device to search |
| 730 | * @cb Function to call when a device is found |
| 731 | */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 732 | 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] | 733 | { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 734 | u64 last_rn, rn, tmp64; |
| 735 | int i, slave_count = 0; |
| 736 | int last_zero, last_device; |
| 737 | int search_bit, desc_bit; |
| 738 | u8 triplet_ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 740 | search_bit = 0; |
| 741 | rn = last_rn = 0; |
| 742 | last_device = 0; |
| 743 | last_zero = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
| 745 | desc_bit = 64; |
| 746 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 747 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
| 748 | last_rn = rn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | rn = 0; |
| 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | /* |
| 752 | * Reset bus and all 1-wire device state machines |
| 753 | * so they can respond to our requests. |
| 754 | * |
| 755 | * Return 0 - device(s) present, 1 - no devices present. |
| 756 | */ |
| 757 | if (w1_reset_bus(dev)) { |
Evgeniy Polyakov | 2da5bf8 | 2005-08-12 11:46:22 -0700 | [diff] [blame] | 758 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | break; |
| 760 | } |
| 761 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 762 | /* Start the search */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 763 | w1_write_8(dev, search_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | for (i = 0; i < 64; ++i) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 765 | /* Determine the direction/search bit */ |
| 766 | if (i == desc_bit) |
| 767 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ |
| 768 | else if (i > desc_bit) |
| 769 | search_bit = 0; /* take the 0 path on the next branch */ |
| 770 | else |
| 771 | search_bit = ((last_rn >> i) & 0x1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 773 | /** Read two bits and write one bit */ |
| 774 | triplet_ret = w1_triplet(dev, search_bit); |
| 775 | |
| 776 | /* quit if no device responded */ |
| 777 | if ( (triplet_ret & 0x03) == 0x03 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | break; |
| 779 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 780 | /* If both directions were valid, and we took the 0 path... */ |
| 781 | if (triplet_ret == 0) |
| 782 | last_zero = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 784 | /* extract the direction taken & update the device number */ |
| 785 | tmp64 = (triplet_ret >> 2); |
| 786 | rn |= (tmp64 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 789 | if ( (triplet_ret & 0x03) != 0x03 ) { |
| 790 | if ( (desc_bit == last_zero) || (last_zero < 0)) |
| 791 | last_device = 1; |
| 792 | desc_bit = last_zero; |
| 793 | cb(dev->bus_master->data, rn); |
| 794 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | } |
| 797 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 798 | static int w1_control(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 800 | struct w1_slave *sl, *sln; |
| 801 | struct w1_master *dev, *n; |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 802 | int have_to_wait = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 804 | while (!kthread_should_stop() || have_to_wait) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | have_to_wait = 0; |
| 806 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 807 | try_to_freeze(); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 808 | msleep_interruptible(w1_control_timeout * 1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 810 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 811 | if (!kthread_should_stop() && !dev->flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | continue; |
| 813 | /* |
| 814 | * Little race: we can create thread but not set the flag. |
| 815 | * Get a chance for external process to set flag up. |
| 816 | */ |
| 817 | if (!dev->initialized) { |
| 818 | have_to_wait = 1; |
| 819 | continue; |
| 820 | } |
| 821 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 822 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 823 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 825 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 826 | list_del(&dev->w1_master_entry); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 827 | mutex_unlock(&w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 829 | mutex_lock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 830 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 831 | w1_slave_detach(sl); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 832 | } |
| 833 | w1_destroy_master_attributes(dev); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 834 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 835 | atomic_dec(&dev->refcnt); |
| 836 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 838 | |
| 839 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { |
Evgeniy Polyakov | 7c8f570 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 840 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 841 | mutex_lock(&dev->mutex); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 842 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 843 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
| 844 | struct w1_reg_num rn; |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 845 | |
| 846 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 847 | w1_slave_detach(sl); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 848 | |
| 849 | w1_attach_slave_device(dev, &rn); |
| 850 | } |
| 851 | } |
Evgeniy Polyakov | 7c8f570 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 852 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 853 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 854 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | } |
| 858 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 859 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | } |
| 861 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 862 | void w1_search_process(struct w1_master *dev, u8 search_type) |
| 863 | { |
| 864 | struct w1_slave *sl, *sln; |
| 865 | |
| 866 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
| 867 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
| 868 | |
| 869 | w1_search_devices(dev, search_type, w1_slave_found); |
| 870 | |
| 871 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
| 872 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { |
| 873 | w1_slave_detach(sl); |
| 874 | |
| 875 | dev->slave_count--; |
| 876 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
| 877 | sl->ttl = dev->slave_ttl; |
| 878 | } |
| 879 | |
| 880 | if (dev->search_count > 0) |
| 881 | dev->search_count--; |
| 882 | } |
| 883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | int w1_process(void *data) |
| 885 | { |
| 886 | struct w1_master *dev = (struct w1_master *) data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 888 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 889 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | msleep_interruptible(w1_timeout * 1000); |
| 891 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 892 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | break; |
| 894 | |
| 895 | if (!dev->initialized) |
| 896 | continue; |
| 897 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 898 | if (dev->search_count == 0) |
| 899 | continue; |
| 900 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 901 | mutex_lock(&dev->mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 902 | w1_search_process(dev, W1_SEARCH); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 903 | mutex_unlock(&dev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | } |
| 905 | |
| 906 | atomic_dec(&dev->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | return 0; |
| 909 | } |
| 910 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 911 | static int w1_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | { |
| 913 | int retval; |
| 914 | |
| 915 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); |
| 916 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 917 | w1_init_netlink(); |
| 918 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | retval = bus_register(&w1_bus_type); |
| 920 | if (retval) { |
| 921 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); |
| 922 | goto err_out_exit_init; |
| 923 | } |
| 924 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 925 | retval = driver_register(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | if (retval) { |
| 927 | printk(KERN_ERR |
| 928 | "Failed to register master driver. err=%d.\n", |
| 929 | retval); |
| 930 | goto err_out_bus_unregister; |
| 931 | } |
| 932 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 933 | retval = driver_register(&w1_slave_driver); |
| 934 | if (retval) { |
| 935 | printk(KERN_ERR |
| 936 | "Failed to register master driver. err=%d.\n", |
| 937 | retval); |
| 938 | goto err_out_master_unregister; |
| 939 | } |
| 940 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 941 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
| 942 | if (IS_ERR(w1_control_thread)) { |
| 943 | retval = PTR_ERR(w1_control_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 945 | retval); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 946 | goto err_out_slave_unregister; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
| 948 | |
| 949 | return 0; |
| 950 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 951 | err_out_slave_unregister: |
| 952 | driver_unregister(&w1_slave_driver); |
| 953 | |
| 954 | err_out_master_unregister: |
| 955 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | err_out_bus_unregister: |
| 958 | bus_unregister(&w1_bus_type); |
| 959 | |
| 960 | err_out_exit_init: |
| 961 | return retval; |
| 962 | } |
| 963 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 964 | static void w1_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | { |
| 966 | struct w1_master *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 968 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | __w1_remove_master_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 971 | w1_fini_netlink(); |
| 972 | |
Evgeniy Polyakov | 674a396 | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 973 | kthread_stop(w1_control_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 975 | driver_unregister(&w1_slave_driver); |
| 976 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | bus_unregister(&w1_bus_type); |
| 978 | } |
| 979 | |
| 980 | module_init(w1_init); |
| 981 | module_exit(w1_fini); |