Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
7785925d | 5 | * |
1da177e4 LT |
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> | |
674a396c | 33 | #include <linux/kthread.h> |
7dfb7103 | 34 | #include <linux/freezer.h> |
1da177e4 LT |
35 | |
36 | #include <asm/atomic.h> | |
37 | ||
38 | #include "w1.h" | |
1da177e4 LT |
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; | |
3aca692d | 49 | static int w1_control_timeout = 1; |
1da177e4 LT |
50 | int w1_max_slave_count = 10; |
51 | int w1_max_slave_ttl = 10; | |
52 | ||
53 | module_param_named(timeout, w1_timeout, int, 0); | |
3aca692d | 54 | module_param_named(control_timeout, w1_control_timeout, int, 0); |
1da177e4 LT |
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 | ||
abd52a13 | 58 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
59 | LIST_HEAD(w1_masters); |
60 | ||
674a396c | 61 | static struct task_struct *w1_control_thread; |
1da177e4 LT |
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 | ||
1da177e4 LT |
73 | static void w1_master_release(struct device *dev) |
74 | { | |
db2d0008 | 75 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
76 | |
77 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
78 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
79 | kfree(md); | |
1da177e4 LT |
80 | } |
81 | ||
82 | static void w1_slave_release(struct device *dev) | |
83 | { | |
db2d0008 | 84 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 85 | |
12003375 | 86 | printk("%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
87 | |
88 | while (atomic_read(&sl->refcnt)) { | |
12003375 | 89 | printk("Waiting for %s to become free: refcnt=%d.\n", |
3aca692d EP |
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); | |
1da177e4 LT |
99 | } |
100 | ||
d2a4ef6a | 101 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 102 | { |
3aca692d | 103 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 104 | |
3aca692d | 105 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
106 | } |
107 | ||
d2a4ef6a | 108 | static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) |
1da177e4 | 109 | { |
3aca692d | 110 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
1da177e4 | 111 | |
3aca692d EP |
112 | if (off > 8) { |
113 | count = 0; | |
d2a4ef6a EP |
114 | } else { |
115 | if (off + count > 8) | |
116 | count = 8 - off; | |
117 | ||
118 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
119 | } | |
d2a4ef6a EP |
120 | |
121 | return count; | |
3aca692d | 122 | } |
d2a4ef6a EP |
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, | |
d2a4ef6a EP |
131 | }, |
132 | .size = 8, | |
133 | .read = w1_slave_read_id, | |
7785925d EP |
134 | }; |
135 | ||
d2a4ef6a | 136 | /* Default family */ |
f522d239 EP |
137 | |
138 | static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
139 | { | |
140 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
141 | ||
abd52a13 | 142 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
143 | if (w1_reset_select_slave(sl)) { |
144 | count = 0; | |
145 | goto out_up; | |
146 | } | |
147 | ||
148 | w1_write_block(sl->master, buf, count); | |
149 | ||
150 | out_up: | |
abd52a13 | 151 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
152 | return count; |
153 | } | |
154 | ||
155 | static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
156 | { | |
157 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
158 | ||
abd52a13 | 159 | mutex_lock(&sl->master->mutex); |
f522d239 | 160 | w1_read_block(sl->master, buf, count); |
abd52a13 | 161 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
162 | return count; |
163 | } | |
164 | ||
165 | static struct bin_attribute w1_default_attr = { | |
166 | .attr = { | |
167 | .name = "rw", | |
168 | .mode = S_IRUGO | S_IWUSR, | |
f522d239 EP |
169 | }, |
170 | .size = PAGE_SIZE, | |
171 | .read = w1_default_read, | |
172 | .write = w1_default_write, | |
173 | }; | |
174 | ||
175 | static int w1_default_add_slave(struct w1_slave *sl) | |
176 | { | |
177 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
178 | } | |
179 | ||
180 | static void w1_default_remove_slave(struct w1_slave *sl) | |
181 | { | |
182 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
183 | } | |
184 | ||
185 | static struct w1_family_ops w1_default_fops = { | |
186 | .add_slave = w1_default_add_slave, | |
187 | .remove_slave = w1_default_remove_slave, | |
188 | }; | |
189 | ||
190 | static struct w1_family w1_default_family = { | |
191 | .fops = &w1_default_fops, | |
192 | }; | |
d2a4ef6a | 193 | |
312c004d | 194 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 195 | |
1da177e4 LT |
196 | static struct bus_type w1_bus_type = { |
197 | .name = "w1", | |
198 | .match = w1_master_match, | |
312c004d | 199 | .uevent = w1_uevent, |
1da177e4 LT |
200 | }; |
201 | ||
7f772ed8 EP |
202 | struct device_driver w1_master_driver = { |
203 | .name = "w1_master_driver", | |
1da177e4 LT |
204 | .bus = &w1_bus_type, |
205 | .probe = w1_master_probe, | |
1da177e4 LT |
206 | }; |
207 | ||
7f772ed8 | 208 | struct device w1_master_device = { |
1da177e4 LT |
209 | .parent = NULL, |
210 | .bus = &w1_bus_type, | |
211 | .bus_id = "w1 bus master", | |
7f772ed8 | 212 | .driver = &w1_master_driver, |
1da177e4 LT |
213 | .release = &w1_master_release |
214 | }; | |
215 | ||
2c5bfdac | 216 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
217 | .name = "w1_slave_driver", |
218 | .bus = &w1_bus_type, | |
219 | }; | |
220 | ||
2c5bfdac | 221 | #if 0 |
7f772ed8 EP |
222 | struct device w1_slave_device = { |
223 | .parent = NULL, | |
224 | .bus = &w1_bus_type, | |
225 | .bus_id = "w1 bus slave", | |
226 | .driver = &w1_slave_driver, | |
3aca692d | 227 | .release = &w1_slave_release |
7f772ed8 | 228 | }; |
2c5bfdac | 229 | #endif /* 0 */ |
7f772ed8 | 230 | |
060b8845 | 231 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 232 | { |
db2d0008 | 233 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 234 | ssize_t count; |
7785925d | 235 | |
abd52a13 | 236 | mutex_lock(&md->mutex); |
1da177e4 | 237 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 238 | mutex_unlock(&md->mutex); |
1da177e4 LT |
239 | |
240 | return count; | |
241 | } | |
242 | ||
2a9d0c17 EP |
243 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
244 | struct device_attribute *attr, | |
245 | const char * buf, size_t count) | |
246 | { | |
db2d0008 | 247 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 | 248 | |
abd52a13 | 249 | mutex_lock(&md->mutex); |
2a9d0c17 | 250 | md->search_count = simple_strtol(buf, NULL, 0); |
abd52a13 | 251 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
252 | |
253 | return count; | |
254 | } | |
255 | ||
256 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
257 | struct device_attribute *attr, | |
258 | char *buf) | |
259 | { | |
db2d0008 | 260 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
261 | ssize_t count; |
262 | ||
abd52a13 | 263 | mutex_lock(&md->mutex); |
2a9d0c17 | 264 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 265 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
266 | |
267 | return count; | |
268 | } | |
269 | ||
060b8845 | 270 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 271 | { |
db2d0008 | 272 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 273 | ssize_t count; |
7785925d | 274 | |
abd52a13 | 275 | mutex_lock(&md->mutex); |
1da177e4 | 276 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 277 | mutex_unlock(&md->mutex); |
1da177e4 LT |
278 | return count; |
279 | } | |
280 | ||
060b8845 | 281 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
282 | { |
283 | ssize_t count; | |
284 | count = sprintf(buf, "%d\n", w1_timeout); | |
285 | return count; | |
286 | } | |
287 | ||
060b8845 | 288 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 289 | { |
db2d0008 | 290 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 291 | ssize_t count; |
7785925d | 292 | |
abd52a13 | 293 | mutex_lock(&md->mutex); |
1da177e4 | 294 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 295 | mutex_unlock(&md->mutex); |
1da177e4 LT |
296 | return count; |
297 | } | |
298 | ||
060b8845 | 299 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 300 | { |
db2d0008 | 301 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 302 | ssize_t count; |
7785925d | 303 | |
abd52a13 | 304 | mutex_lock(&md->mutex); |
1da177e4 | 305 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 306 | mutex_unlock(&md->mutex); |
1da177e4 LT |
307 | return count; |
308 | } | |
309 | ||
060b8845 | 310 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 311 | { |
db2d0008 | 312 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 313 | ssize_t count; |
7785925d | 314 | |
abd52a13 | 315 | mutex_lock(&md->mutex); |
1da177e4 | 316 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 317 | mutex_unlock(&md->mutex); |
1da177e4 LT |
318 | return count; |
319 | } | |
320 | ||
060b8845 | 321 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 322 | { |
db2d0008 | 323 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
324 | int c = PAGE_SIZE; |
325 | ||
abd52a13 | 326 | mutex_lock(&md->mutex); |
1da177e4 LT |
327 | |
328 | if (md->slave_count == 0) | |
329 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
330 | else { | |
331 | struct list_head *ent, *n; | |
332 | struct w1_slave *sl; | |
333 | ||
334 | list_for_each_safe(ent, n, &md->slist) { | |
335 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
336 | ||
7785925d | 337 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
338 | } |
339 | } | |
340 | ||
abd52a13 | 341 | mutex_unlock(&md->mutex); |
1da177e4 LT |
342 | |
343 | return PAGE_SIZE - c; | |
344 | } | |
345 | ||
7785925d EP |
346 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
347 | struct device_attribute w1_master_attribute_##_name = \ | |
348 | __ATTR(w1_master_##_name, _mode, \ | |
349 | w1_master_attribute_show_##_name, NULL) | |
350 | ||
2a9d0c17 EP |
351 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
352 | struct device_attribute w1_master_attribute_##_name = \ | |
353 | __ATTR(w1_master_##_name, _mode, \ | |
354 | w1_master_attribute_show_##_name, \ | |
355 | w1_master_attribute_store_##_name) | |
356 | ||
7785925d EP |
357 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
358 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
359 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
360 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
361 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
362 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
363 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 364 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
365 | |
366 | static struct attribute *w1_master_default_attrs[] = { | |
367 | &w1_master_attribute_name.attr, | |
368 | &w1_master_attribute_slaves.attr, | |
369 | &w1_master_attribute_slave_count.attr, | |
370 | &w1_master_attribute_max_slave_count.attr, | |
371 | &w1_master_attribute_attempts.attr, | |
372 | &w1_master_attribute_timeout.attr, | |
373 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 374 | &w1_master_attribute_search.attr, |
7785925d | 375 | NULL |
1da177e4 LT |
376 | }; |
377 | ||
7785925d EP |
378 | static struct attribute_group w1_master_defattr_group = { |
379 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
380 | }; |
381 | ||
7785925d EP |
382 | int w1_create_master_attributes(struct w1_master *master) |
383 | { | |
384 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
385 | } | |
386 | ||
2c5bfdac | 387 | static void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
388 | { |
389 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
390 | } | |
391 | ||
7f772ed8 | 392 | #ifdef CONFIG_HOTPLUG |
c6976a4e AM |
393 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
394 | char *buffer, int buffer_size) | |
7f772ed8 EP |
395 | { |
396 | struct w1_master *md = NULL; | |
397 | struct w1_slave *sl = NULL; | |
398 | char *event_owner, *name; | |
399 | int err, cur_index=0, cur_len=0; | |
400 | ||
401 | if (dev->driver == &w1_master_driver) { | |
402 | md = container_of(dev, struct w1_master, dev); | |
403 | event_owner = "master"; | |
404 | name = md->name; | |
405 | } else if (dev->driver == &w1_slave_driver) { | |
406 | sl = container_of(dev, struct w1_slave, dev); | |
407 | event_owner = "slave"; | |
408 | name = sl->name; | |
409 | } else { | |
312c004d | 410 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
411 | return -EINVAL; |
412 | } | |
413 | ||
c6976a4e AM |
414 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
415 | event_owner, name, dev->bus_id); | |
7f772ed8 EP |
416 | |
417 | if (dev->driver != &w1_slave_driver || !sl) | |
418 | return 0; | |
419 | ||
c6976a4e AM |
420 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
421 | &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
7f772ed8 EP |
422 | if (err) |
423 | return err; | |
424 | ||
c6976a4e AM |
425 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
426 | &cur_len, "W1_SLAVE_ID=%024LX", | |
427 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
428 | if (err) |
429 | return err; | |
430 | ||
431 | return 0; | |
432 | }; | |
433 | #else | |
c6976a4e AM |
434 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
435 | char *buffer, int buffer_size) | |
7f772ed8 EP |
436 | { |
437 | return 0; | |
438 | } | |
439 | #endif | |
440 | ||
1da177e4 LT |
441 | static int __w1_attach_slave_device(struct w1_slave *sl) |
442 | { | |
443 | int err; | |
444 | ||
445 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 446 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
447 | sl->dev.bus = &w1_bus_type; |
448 | sl->dev.release = &w1_slave_release; | |
449 | ||
450 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
451 | "%02x-%012llx", |
452 | (unsigned int) sl->reg_num.family, | |
453 | (unsigned long long) sl->reg_num.id); | |
454 | snprintf(&sl->name[0], sizeof(sl->name), | |
455 | "%02x-%012llx", | |
456 | (unsigned int) sl->reg_num.family, | |
457 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 458 | |
c6976a4e | 459 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
60ed34be | 460 | &sl->dev.bus_id[0], sl); |
1da177e4 LT |
461 | |
462 | err = device_register(&sl->dev); | |
463 | if (err < 0) { | |
464 | dev_err(&sl->dev, | |
6b729861 EP |
465 | "Device registration [%s] failed. err=%d\n", |
466 | sl->dev.bus_id, err); | |
1da177e4 LT |
467 | return err; |
468 | } | |
469 | ||
d2a4ef6a EP |
470 | /* Create "name" entry */ |
471 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
472 | if (err < 0) { | |
473 | dev_err(&sl->dev, | |
474 | "sysfs file creation for [%s] failed. err=%d\n", | |
475 | sl->dev.bus_id, err); | |
476 | goto out_unreg; | |
477 | } | |
1da177e4 | 478 | |
d2a4ef6a EP |
479 | /* Create "id" entry */ |
480 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
481 | if (err < 0) { |
482 | dev_err(&sl->dev, | |
6b729861 EP |
483 | "sysfs file creation for [%s] failed. err=%d\n", |
484 | sl->dev.bus_id, err); | |
d2a4ef6a | 485 | goto out_rem1; |
1da177e4 LT |
486 | } |
487 | ||
d2a4ef6a EP |
488 | /* if the family driver needs to initialize something... */ |
489 | if (sl->family->fops && sl->family->fops->add_slave && | |
490 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
491 | dev_err(&sl->dev, | |
492 | "sysfs file creation for [%s] failed. err=%d\n", | |
493 | sl->dev.bus_id, err); | |
494 | goto out_rem2; | |
1da177e4 LT |
495 | } |
496 | ||
497 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
498 | ||
499 | return 0; | |
d2a4ef6a EP |
500 | |
501 | out_rem2: | |
502 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
503 | out_rem1: | |
504 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
505 | out_unreg: | |
506 | device_unregister(&sl->dev); | |
507 | return err; | |
1da177e4 LT |
508 | } |
509 | ||
510 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
511 | { | |
512 | struct w1_slave *sl; | |
513 | struct w1_family *f; | |
514 | int err; | |
515 | struct w1_netlink_msg msg; | |
516 | ||
517 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
518 | if (!sl) { | |
519 | dev_err(&dev->dev, | |
520 | "%s: failed to allocate new slave device.\n", | |
521 | __func__); | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
525 | memset(sl, 0, sizeof(*sl)); | |
526 | ||
527 | sl->owner = THIS_MODULE; | |
528 | sl->master = dev; | |
529 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
530 | ||
12003375 | 531 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
532 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
533 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 534 | init_completion(&sl->released); |
1da177e4 LT |
535 | |
536 | spin_lock(&w1_flock); | |
537 | f = w1_family_registered(rn->family); | |
538 | if (!f) { | |
99c5bfe9 | 539 | f= &w1_default_family; |
1da177e4 LT |
540 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
541 | rn->family, rn->family, | |
542 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
543 | } |
544 | __w1_family_get(f); | |
545 | spin_unlock(&w1_flock); | |
546 | ||
547 | sl->family = f; | |
548 | ||
549 | ||
550 | err = __w1_attach_slave_device(sl); | |
551 | if (err < 0) { | |
552 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
553 | sl->name); | |
554 | w1_family_put(sl->family); | |
555 | kfree(sl); | |
556 | return err; | |
557 | } | |
558 | ||
559 | sl->ttl = dev->slave_ttl; | |
560 | dev->slave_count++; | |
561 | ||
12003375 | 562 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
563 | msg.type = W1_SLAVE_ADD; |
564 | w1_netlink_send(dev, &msg); | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static void w1_slave_detach(struct w1_slave *sl) | |
570 | { | |
571 | struct w1_netlink_msg msg; | |
7785925d | 572 | |
7c8f5703 | 573 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 574 | |
3aca692d | 575 | list_del(&sl->w1_slave_entry); |
1da177e4 | 576 | |
d2a4ef6a EP |
577 | if (sl->family->fops && sl->family->fops->remove_slave) |
578 | sl->family->fops->remove_slave(sl); | |
579 | ||
12003375 EP |
580 | memset(&msg, 0, sizeof(msg)); |
581 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
582 | msg.type = W1_SLAVE_REMOVE; |
583 | w1_netlink_send(sl->master, &msg); | |
584 | ||
d2a4ef6a EP |
585 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
586 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 587 | device_unregister(&sl->dev); |
1da177e4 | 588 | |
3aca692d EP |
589 | wait_for_completion(&sl->released); |
590 | kfree(sl); | |
1da177e4 LT |
591 | } |
592 | ||
ccd69940 | 593 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
594 | { |
595 | struct w1_master *dev; | |
596 | int found = 0; | |
7785925d | 597 | |
abd52a13 | 598 | mutex_lock(&w1_mlock); |
1da177e4 LT |
599 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
600 | if (dev->bus_master->data == data) { | |
601 | found = 1; | |
602 | atomic_inc(&dev->refcnt); | |
603 | break; | |
604 | } | |
605 | } | |
abd52a13 | 606 | mutex_unlock(&w1_mlock); |
1da177e4 LT |
607 | |
608 | return (found)?dev:NULL; | |
609 | } | |
610 | ||
12003375 EP |
611 | struct w1_master *w1_search_master_id(u32 id) |
612 | { | |
613 | struct w1_master *dev; | |
614 | int found = 0; | |
615 | ||
abd52a13 | 616 | mutex_lock(&w1_mlock); |
12003375 EP |
617 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
618 | if (dev->id == id) { | |
619 | found = 1; | |
620 | atomic_inc(&dev->refcnt); | |
621 | break; | |
622 | } | |
623 | } | |
abd52a13 | 624 | mutex_unlock(&w1_mlock); |
12003375 EP |
625 | |
626 | return (found)?dev:NULL; | |
627 | } | |
628 | ||
629 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
630 | { | |
631 | struct w1_master *dev; | |
632 | struct w1_slave *sl = NULL; | |
633 | int found = 0; | |
634 | ||
abd52a13 | 635 | mutex_lock(&w1_mlock); |
12003375 | 636 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 637 | mutex_lock(&dev->mutex); |
12003375 EP |
638 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
639 | if (sl->reg_num.family == id->family && | |
640 | sl->reg_num.id == id->id && | |
641 | sl->reg_num.crc == id->crc) { | |
642 | found = 1; | |
643 | atomic_inc(&dev->refcnt); | |
644 | atomic_inc(&sl->refcnt); | |
645 | break; | |
646 | } | |
647 | } | |
abd52a13 | 648 | mutex_unlock(&dev->mutex); |
12003375 EP |
649 | |
650 | if (found) | |
651 | break; | |
652 | } | |
abd52a13 | 653 | mutex_unlock(&w1_mlock); |
12003375 EP |
654 | |
655 | return (found)?sl:NULL; | |
656 | } | |
657 | ||
6adf87bd EP |
658 | void w1_reconnect_slaves(struct w1_family *f) |
659 | { | |
660 | struct w1_master *dev; | |
661 | ||
abd52a13 | 662 | mutex_lock(&w1_mlock); |
6adf87bd | 663 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
7c8f5703 | 664 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
665 | dev->name, f->fid); |
666 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
667 | } | |
abd52a13 | 668 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
669 | } |
670 | ||
ccd69940 | 671 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
672 | { |
673 | int slave_count; | |
674 | struct w1_slave *sl; | |
675 | struct list_head *ent; | |
676 | struct w1_reg_num *tmp; | |
677 | int family_found = 0; | |
678 | struct w1_master *dev; | |
0e65f828 | 679 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
680 | |
681 | dev = w1_search_master(data); | |
682 | if (!dev) { | |
ccd69940 EP |
683 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
684 | "it is impossible.\n", data); | |
1da177e4 LT |
685 | return; |
686 | } | |
7785925d | 687 | |
1da177e4 LT |
688 | tmp = (struct w1_reg_num *) &rn; |
689 | ||
690 | slave_count = 0; | |
691 | list_for_each(ent, &dev->slist) { | |
692 | ||
693 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
694 | ||
695 | if (sl->reg_num.family == tmp->family && | |
696 | sl->reg_num.id == tmp->id && | |
697 | sl->reg_num.crc == tmp->crc) { | |
698 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
699 | break; | |
7785925d | 700 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
701 | family_found = 1; |
702 | break; | |
703 | } | |
704 | ||
705 | slave_count++; | |
706 | } | |
707 | ||
8523ff45 | 708 | if (slave_count == dev->slave_count && |
0e65f828 | 709 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 710 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 711 | } |
7785925d | 712 | |
1da177e4 LT |
713 | atomic_dec(&dev->refcnt); |
714 | } | |
715 | ||
6b729861 EP |
716 | /** |
717 | * Performs a ROM Search & registers any devices found. | |
718 | * The 1-wire search is a simple binary tree search. | |
719 | * For each bit of the address, we read two bits and write one bit. | |
720 | * The bit written will put to sleep all devies that don't match that bit. | |
721 | * When the two reads differ, the direction choice is obvious. | |
722 | * When both bits are 0, we must choose a path to take. | |
723 | * When we can scan all 64 bits without having to choose a path, we are done. | |
724 | * | |
725 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
726 | * | |
727 | * @dev The master device to search | |
728 | * @cb Function to call when a device is found | |
729 | */ | |
12003375 | 730 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 731 | { |
6b729861 EP |
732 | u64 last_rn, rn, tmp64; |
733 | int i, slave_count = 0; | |
734 | int last_zero, last_device; | |
735 | int search_bit, desc_bit; | |
736 | u8 triplet_ret = 0; | |
1da177e4 | 737 | |
6b729861 EP |
738 | search_bit = 0; |
739 | rn = last_rn = 0; | |
740 | last_device = 0; | |
741 | last_zero = -1; | |
1da177e4 LT |
742 | |
743 | desc_bit = 64; | |
744 | ||
6b729861 EP |
745 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
746 | last_rn = rn; | |
1da177e4 LT |
747 | rn = 0; |
748 | ||
1da177e4 LT |
749 | /* |
750 | * Reset bus and all 1-wire device state machines | |
751 | * so they can respond to our requests. | |
752 | * | |
753 | * Return 0 - device(s) present, 1 - no devices present. | |
754 | */ | |
755 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 756 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
757 | break; |
758 | } | |
759 | ||
6b729861 | 760 | /* Start the search */ |
12003375 | 761 | w1_write_8(dev, search_type); |
1da177e4 | 762 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
763 | /* Determine the direction/search bit */ |
764 | if (i == desc_bit) | |
765 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
766 | else if (i > desc_bit) | |
767 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 768 | else |
6b729861 | 769 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 770 | |
6b729861 EP |
771 | /** Read two bits and write one bit */ |
772 | triplet_ret = w1_triplet(dev, search_bit); | |
773 | ||
774 | /* quit if no device responded */ | |
775 | if ( (triplet_ret & 0x03) == 0x03 ) | |
776 | break; | |
1da177e4 | 777 | |
6b729861 EP |
778 | /* If both directions were valid, and we took the 0 path... */ |
779 | if (triplet_ret == 0) | |
780 | last_zero = i; | |
1da177e4 | 781 | |
6b729861 EP |
782 | /* extract the direction taken & update the device number */ |
783 | tmp64 = (triplet_ret >> 2); | |
784 | rn |= (tmp64 << i); | |
785 | } | |
7785925d | 786 | |
6b729861 EP |
787 | if ( (triplet_ret & 0x03) != 0x03 ) { |
788 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
789 | last_device = 1; | |
790 | desc_bit = last_zero; | |
791 | cb(dev->bus_master->data, rn); | |
792 | } | |
1da177e4 LT |
793 | } |
794 | } | |
795 | ||
7785925d | 796 | static int w1_control(void *data) |
1da177e4 | 797 | { |
7785925d EP |
798 | struct w1_slave *sl, *sln; |
799 | struct w1_master *dev, *n; | |
674a396c | 800 | int have_to_wait = 0; |
1da177e4 | 801 | |
674a396c | 802 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
803 | have_to_wait = 0; |
804 | ||
3e1d1d28 | 805 | try_to_freeze(); |
3aca692d | 806 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 807 | |
7785925d | 808 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 809 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
810 | continue; |
811 | /* | |
812 | * Little race: we can create thread but not set the flag. | |
813 | * Get a chance for external process to set flag up. | |
814 | */ | |
815 | if (!dev->initialized) { | |
816 | have_to_wait = 1; | |
817 | continue; | |
818 | } | |
819 | ||
674a396c | 820 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 821 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 822 | |
abd52a13 | 823 | mutex_lock(&w1_mlock); |
6adf87bd | 824 | list_del(&dev->w1_master_entry); |
abd52a13 | 825 | mutex_unlock(&w1_mlock); |
6adf87bd | 826 | |
abd52a13 | 827 | mutex_lock(&dev->mutex); |
6adf87bd | 828 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 829 | w1_slave_detach(sl); |
6adf87bd EP |
830 | } |
831 | w1_destroy_master_attributes(dev); | |
abd52a13 | 832 | mutex_unlock(&dev->mutex); |
6adf87bd EP |
833 | atomic_dec(&dev->refcnt); |
834 | continue; | |
835 | } | |
836 | ||
837 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 838 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
abd52a13 | 839 | mutex_lock(&dev->mutex); |
3aca692d | 840 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
841 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
842 | struct w1_reg_num rn; | |
6adf87bd EP |
843 | |
844 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 845 | w1_slave_detach(sl); |
1da177e4 | 846 | |
6adf87bd EP |
847 | w1_attach_slave_device(dev, &rn); |
848 | } | |
849 | } | |
7c8f5703 | 850 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd | 851 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
abd52a13 | 852 | mutex_unlock(&dev->mutex); |
1da177e4 | 853 | } |
1da177e4 LT |
854 | } |
855 | } | |
856 | ||
674a396c | 857 | return 0; |
1da177e4 LT |
858 | } |
859 | ||
12003375 EP |
860 | void w1_search_process(struct w1_master *dev, u8 search_type) |
861 | { | |
862 | struct w1_slave *sl, *sln; | |
863 | ||
864 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
865 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
866 | ||
867 | w1_search_devices(dev, search_type, w1_slave_found); | |
868 | ||
869 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
870 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
871 | w1_slave_detach(sl); | |
872 | ||
873 | dev->slave_count--; | |
874 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) | |
875 | sl->ttl = dev->slave_ttl; | |
876 | } | |
877 | ||
878 | if (dev->search_count > 0) | |
879 | dev->search_count--; | |
880 | } | |
881 | ||
1da177e4 LT |
882 | int w1_process(void *data) |
883 | { | |
884 | struct w1_master *dev = (struct w1_master *) data; | |
1da177e4 | 885 | |
674a396c | 886 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 887 | try_to_freeze(); |
1da177e4 LT |
888 | msleep_interruptible(w1_timeout * 1000); |
889 | ||
674a396c | 890 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
891 | break; |
892 | ||
893 | if (!dev->initialized) | |
894 | continue; | |
895 | ||
2a9d0c17 EP |
896 | if (dev->search_count == 0) |
897 | continue; | |
898 | ||
abd52a13 | 899 | mutex_lock(&dev->mutex); |
12003375 | 900 | w1_search_process(dev, W1_SEARCH); |
abd52a13 | 901 | mutex_unlock(&dev->mutex); |
1da177e4 LT |
902 | } |
903 | ||
904 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
905 | |
906 | return 0; | |
907 | } | |
908 | ||
7785925d | 909 | static int w1_init(void) |
1da177e4 LT |
910 | { |
911 | int retval; | |
912 | ||
913 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
914 | ||
12003375 EP |
915 | w1_init_netlink(); |
916 | ||
1da177e4 LT |
917 | retval = bus_register(&w1_bus_type); |
918 | if (retval) { | |
919 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
920 | goto err_out_exit_init; | |
921 | } | |
922 | ||
7f772ed8 | 923 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
924 | if (retval) { |
925 | printk(KERN_ERR | |
926 | "Failed to register master driver. err=%d.\n", | |
927 | retval); | |
928 | goto err_out_bus_unregister; | |
929 | } | |
930 | ||
7f772ed8 EP |
931 | retval = driver_register(&w1_slave_driver); |
932 | if (retval) { | |
933 | printk(KERN_ERR | |
934 | "Failed to register master driver. err=%d.\n", | |
935 | retval); | |
936 | goto err_out_master_unregister; | |
937 | } | |
938 | ||
674a396c EP |
939 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
940 | if (IS_ERR(w1_control_thread)) { | |
941 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 942 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 943 | retval); |
7f772ed8 | 944 | goto err_out_slave_unregister; |
1da177e4 LT |
945 | } |
946 | ||
947 | return 0; | |
948 | ||
7f772ed8 EP |
949 | err_out_slave_unregister: |
950 | driver_unregister(&w1_slave_driver); | |
951 | ||
952 | err_out_master_unregister: | |
953 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
954 | |
955 | err_out_bus_unregister: | |
956 | bus_unregister(&w1_bus_type); | |
957 | ||
958 | err_out_exit_init: | |
959 | return retval; | |
960 | } | |
961 | ||
7785925d | 962 | static void w1_fini(void) |
1da177e4 LT |
963 | { |
964 | struct w1_master *dev; | |
1da177e4 | 965 | |
7785925d | 966 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 967 | __w1_remove_master_device(dev); |
1da177e4 | 968 | |
12003375 EP |
969 | w1_fini_netlink(); |
970 | ||
674a396c | 971 | kthread_stop(w1_control_thread); |
1da177e4 | 972 | |
7f772ed8 EP |
973 | driver_unregister(&w1_slave_driver); |
974 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
975 | bus_unregister(&w1_bus_type); |
976 | } | |
977 | ||
978 | module_init(w1_init); | |
979 | module_exit(w1_fini); |