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Commit | Line | Data |
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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; | |
49 | int w1_max_slave_count = 10; | |
50 | int w1_max_slave_ttl = 10; | |
51 | ||
52 | module_param_named(timeout, w1_timeout, int, 0); | |
53 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); | |
54 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); | |
55 | ||
abd52a13 | 56 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
57 | LIST_HEAD(w1_masters); |
58 | ||
1da177e4 LT |
59 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
60 | { | |
61 | return 1; | |
62 | } | |
63 | ||
64 | static int w1_master_probe(struct device *dev) | |
65 | { | |
66 | return -ENODEV; | |
67 | } | |
68 | ||
1da177e4 LT |
69 | static void w1_master_release(struct device *dev) |
70 | { | |
db2d0008 | 71 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
72 | |
73 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
74 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
75 | kfree(md); | |
1da177e4 LT |
76 | } |
77 | ||
78 | static void w1_slave_release(struct device *dev) | |
79 | { | |
db2d0008 | 80 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 81 | |
12003375 | 82 | printk("%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
83 | |
84 | while (atomic_read(&sl->refcnt)) { | |
12003375 | 85 | printk("Waiting for %s to become free: refcnt=%d.\n", |
3aca692d EP |
86 | sl->name, atomic_read(&sl->refcnt)); |
87 | if (msleep_interruptible(1000)) | |
88 | flush_signals(current); | |
89 | } | |
90 | ||
91 | w1_family_put(sl->family); | |
92 | sl->master->slave_count--; | |
93 | ||
94 | complete(&sl->released); | |
1da177e4 LT |
95 | } |
96 | ||
d2a4ef6a | 97 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 98 | { |
3aca692d | 99 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 100 | |
3aca692d | 101 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
102 | } |
103 | ||
91a69029 ZR |
104 | static ssize_t w1_slave_read_id(struct kobject *kobj, |
105 | struct bin_attribute *bin_attr, | |
106 | char *buf, loff_t off, size_t count) | |
1da177e4 | 107 | { |
3aca692d | 108 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
1da177e4 | 109 | |
3aca692d EP |
110 | if (off > 8) { |
111 | count = 0; | |
d2a4ef6a EP |
112 | } else { |
113 | if (off + count > 8) | |
114 | count = 8 - off; | |
115 | ||
116 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
117 | } | |
d2a4ef6a EP |
118 | |
119 | return count; | |
3aca692d | 120 | } |
d2a4ef6a EP |
121 | |
122 | static struct device_attribute w1_slave_attr_name = | |
123 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); | |
124 | ||
125 | static struct bin_attribute w1_slave_attr_bin_id = { | |
126 | .attr = { | |
127 | .name = "id", | |
128 | .mode = S_IRUGO, | |
d2a4ef6a EP |
129 | }, |
130 | .size = 8, | |
131 | .read = w1_slave_read_id, | |
7785925d EP |
132 | }; |
133 | ||
d2a4ef6a | 134 | /* Default family */ |
f522d239 | 135 | |
91a69029 ZR |
136 | static ssize_t w1_default_write(struct kobject *kobj, |
137 | struct bin_attribute *bin_attr, | |
138 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
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 | ||
91a69029 ZR |
155 | static ssize_t w1_default_read(struct kobject *kobj, |
156 | struct bin_attribute *bin_attr, | |
157 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
158 | { |
159 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
160 | ||
abd52a13 | 161 | mutex_lock(&sl->master->mutex); |
f522d239 | 162 | w1_read_block(sl->master, buf, count); |
abd52a13 | 163 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
164 | return count; |
165 | } | |
166 | ||
167 | static struct bin_attribute w1_default_attr = { | |
168 | .attr = { | |
169 | .name = "rw", | |
170 | .mode = S_IRUGO | S_IWUSR, | |
f522d239 EP |
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 | }; | |
d2a4ef6a | 195 | |
7eff2e7a | 196 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 197 | |
1da177e4 LT |
198 | static struct bus_type w1_bus_type = { |
199 | .name = "w1", | |
200 | .match = w1_master_match, | |
312c004d | 201 | .uevent = w1_uevent, |
1da177e4 LT |
202 | }; |
203 | ||
7f772ed8 EP |
204 | struct device_driver w1_master_driver = { |
205 | .name = "w1_master_driver", | |
1da177e4 LT |
206 | .bus = &w1_bus_type, |
207 | .probe = w1_master_probe, | |
1da177e4 LT |
208 | }; |
209 | ||
7f772ed8 | 210 | struct device w1_master_device = { |
1da177e4 LT |
211 | .parent = NULL, |
212 | .bus = &w1_bus_type, | |
213 | .bus_id = "w1 bus master", | |
7f772ed8 | 214 | .driver = &w1_master_driver, |
1da177e4 LT |
215 | .release = &w1_master_release |
216 | }; | |
217 | ||
2c5bfdac | 218 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
219 | .name = "w1_slave_driver", |
220 | .bus = &w1_bus_type, | |
221 | }; | |
222 | ||
2c5bfdac | 223 | #if 0 |
7f772ed8 EP |
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, | |
3aca692d | 229 | .release = &w1_slave_release |
7f772ed8 | 230 | }; |
2c5bfdac | 231 | #endif /* 0 */ |
7f772ed8 | 232 | |
060b8845 | 233 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 234 | { |
db2d0008 | 235 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 236 | ssize_t count; |
7785925d | 237 | |
abd52a13 | 238 | mutex_lock(&md->mutex); |
1da177e4 | 239 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 240 | mutex_unlock(&md->mutex); |
1da177e4 LT |
241 | |
242 | return count; | |
243 | } | |
244 | ||
2a9d0c17 EP |
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 | { | |
db2d0008 | 249 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 | 250 | |
abd52a13 | 251 | mutex_lock(&md->mutex); |
2a9d0c17 | 252 | md->search_count = simple_strtol(buf, NULL, 0); |
abd52a13 | 253 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
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 | { | |
db2d0008 | 262 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
263 | ssize_t count; |
264 | ||
abd52a13 | 265 | mutex_lock(&md->mutex); |
2a9d0c17 | 266 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 267 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
268 | |
269 | return count; | |
270 | } | |
271 | ||
060b8845 | 272 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 273 | { |
db2d0008 | 274 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 275 | ssize_t count; |
7785925d | 276 | |
abd52a13 | 277 | mutex_lock(&md->mutex); |
1da177e4 | 278 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 279 | mutex_unlock(&md->mutex); |
1da177e4 LT |
280 | return count; |
281 | } | |
282 | ||
060b8845 | 283 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
284 | { |
285 | ssize_t count; | |
286 | count = sprintf(buf, "%d\n", w1_timeout); | |
287 | return count; | |
288 | } | |
289 | ||
060b8845 | 290 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 291 | { |
db2d0008 | 292 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 293 | ssize_t count; |
7785925d | 294 | |
abd52a13 | 295 | mutex_lock(&md->mutex); |
1da177e4 | 296 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 297 | mutex_unlock(&md->mutex); |
1da177e4 LT |
298 | return count; |
299 | } | |
300 | ||
060b8845 | 301 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 302 | { |
db2d0008 | 303 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 304 | ssize_t count; |
7785925d | 305 | |
abd52a13 | 306 | mutex_lock(&md->mutex); |
1da177e4 | 307 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 308 | mutex_unlock(&md->mutex); |
1da177e4 LT |
309 | return count; |
310 | } | |
311 | ||
060b8845 | 312 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 313 | { |
db2d0008 | 314 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 315 | ssize_t count; |
7785925d | 316 | |
abd52a13 | 317 | mutex_lock(&md->mutex); |
1da177e4 | 318 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 319 | mutex_unlock(&md->mutex); |
1da177e4 LT |
320 | return count; |
321 | } | |
322 | ||
060b8845 | 323 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 324 | { |
db2d0008 | 325 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
326 | int c = PAGE_SIZE; |
327 | ||
abd52a13 | 328 | mutex_lock(&md->mutex); |
1da177e4 LT |
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 | ||
7785925d | 339 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
340 | } |
341 | } | |
342 | ||
abd52a13 | 343 | mutex_unlock(&md->mutex); |
1da177e4 LT |
344 | |
345 | return PAGE_SIZE - c; | |
346 | } | |
347 | ||
7785925d EP |
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 | ||
2a9d0c17 EP |
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 | ||
7785925d EP |
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); | |
2a9d0c17 | 366 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
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, | |
2a9d0c17 | 376 | &w1_master_attribute_search.attr, |
7785925d | 377 | NULL |
1da177e4 LT |
378 | }; |
379 | ||
7785925d EP |
380 | static struct attribute_group w1_master_defattr_group = { |
381 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
382 | }; |
383 | ||
7785925d EP |
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 | ||
c30c9b15 | 389 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
390 | { |
391 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
392 | } | |
393 | ||
7f772ed8 | 394 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 395 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
396 | { |
397 | struct w1_master *md = NULL; | |
398 | struct w1_slave *sl = NULL; | |
399 | char *event_owner, *name; | |
7eff2e7a | 400 | int err; |
7f772ed8 EP |
401 | |
402 | if (dev->driver == &w1_master_driver) { | |
403 | md = container_of(dev, struct w1_master, dev); | |
404 | event_owner = "master"; | |
405 | name = md->name; | |
406 | } else if (dev->driver == &w1_slave_driver) { | |
407 | sl = container_of(dev, struct w1_slave, dev); | |
408 | event_owner = "slave"; | |
409 | name = sl->name; | |
410 | } else { | |
312c004d | 411 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
412 | return -EINVAL; |
413 | } | |
414 | ||
c6976a4e AM |
415 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
416 | event_owner, name, dev->bus_id); | |
7f772ed8 EP |
417 | |
418 | if (dev->driver != &w1_slave_driver || !sl) | |
419 | return 0; | |
420 | ||
7eff2e7a | 421 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 EP |
422 | if (err) |
423 | return err; | |
424 | ||
7eff2e7a KS |
425 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
426 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
427 | if (err) |
428 | return err; | |
429 | ||
430 | return 0; | |
431 | }; | |
432 | #else | |
7eff2e7a | 433 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
434 | { |
435 | return 0; | |
436 | } | |
437 | #endif | |
438 | ||
1da177e4 LT |
439 | static int __w1_attach_slave_device(struct w1_slave *sl) |
440 | { | |
441 | int err; | |
442 | ||
443 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 444 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
445 | sl->dev.bus = &w1_bus_type; |
446 | sl->dev.release = &w1_slave_release; | |
447 | ||
448 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
449 | "%02x-%012llx", |
450 | (unsigned int) sl->reg_num.family, | |
451 | (unsigned long long) sl->reg_num.id); | |
452 | snprintf(&sl->name[0], sizeof(sl->name), | |
453 | "%02x-%012llx", | |
454 | (unsigned int) sl->reg_num.family, | |
455 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 456 | |
c6976a4e | 457 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
60ed34be | 458 | &sl->dev.bus_id[0], sl); |
1da177e4 LT |
459 | |
460 | err = device_register(&sl->dev); | |
461 | if (err < 0) { | |
462 | dev_err(&sl->dev, | |
6b729861 EP |
463 | "Device registration [%s] failed. err=%d\n", |
464 | sl->dev.bus_id, err); | |
1da177e4 LT |
465 | return err; |
466 | } | |
467 | ||
d2a4ef6a EP |
468 | /* Create "name" entry */ |
469 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
470 | if (err < 0) { | |
471 | dev_err(&sl->dev, | |
472 | "sysfs file creation for [%s] failed. err=%d\n", | |
473 | sl->dev.bus_id, err); | |
474 | goto out_unreg; | |
475 | } | |
1da177e4 | 476 | |
d2a4ef6a EP |
477 | /* Create "id" entry */ |
478 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
479 | if (err < 0) { |
480 | dev_err(&sl->dev, | |
6b729861 EP |
481 | "sysfs file creation for [%s] failed. err=%d\n", |
482 | sl->dev.bus_id, err); | |
d2a4ef6a | 483 | goto out_rem1; |
1da177e4 LT |
484 | } |
485 | ||
d2a4ef6a EP |
486 | /* if the family driver needs to initialize something... */ |
487 | if (sl->family->fops && sl->family->fops->add_slave && | |
488 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
489 | dev_err(&sl->dev, | |
490 | "sysfs file creation for [%s] failed. err=%d\n", | |
491 | sl->dev.bus_id, err); | |
492 | goto out_rem2; | |
1da177e4 LT |
493 | } |
494 | ||
495 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
496 | ||
497 | return 0; | |
d2a4ef6a EP |
498 | |
499 | out_rem2: | |
500 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
501 | out_rem1: | |
502 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
503 | out_unreg: | |
504 | device_unregister(&sl->dev); | |
505 | return err; | |
1da177e4 LT |
506 | } |
507 | ||
508 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
509 | { | |
510 | struct w1_slave *sl; | |
511 | struct w1_family *f; | |
512 | int err; | |
513 | struct w1_netlink_msg msg; | |
514 | ||
dd00cc48 | 515 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
516 | if (!sl) { |
517 | dev_err(&dev->dev, | |
518 | "%s: failed to allocate new slave device.\n", | |
519 | __func__); | |
520 | return -ENOMEM; | |
521 | } | |
522 | ||
1da177e4 LT |
523 | |
524 | sl->owner = THIS_MODULE; | |
525 | sl->master = dev; | |
526 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
527 | ||
12003375 | 528 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
529 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
530 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 531 | init_completion(&sl->released); |
1da177e4 LT |
532 | |
533 | spin_lock(&w1_flock); | |
534 | f = w1_family_registered(rn->family); | |
535 | if (!f) { | |
99c5bfe9 | 536 | f= &w1_default_family; |
1da177e4 LT |
537 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
538 | rn->family, rn->family, | |
539 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
540 | } |
541 | __w1_family_get(f); | |
542 | spin_unlock(&w1_flock); | |
543 | ||
544 | sl->family = f; | |
545 | ||
546 | ||
547 | err = __w1_attach_slave_device(sl); | |
548 | if (err < 0) { | |
549 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
550 | sl->name); | |
551 | w1_family_put(sl->family); | |
552 | kfree(sl); | |
553 | return err; | |
554 | } | |
555 | ||
556 | sl->ttl = dev->slave_ttl; | |
557 | dev->slave_count++; | |
558 | ||
12003375 | 559 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
560 | msg.type = W1_SLAVE_ADD; |
561 | w1_netlink_send(dev, &msg); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
c30c9b15 | 566 | void w1_slave_detach(struct w1_slave *sl) |
1da177e4 LT |
567 | { |
568 | struct w1_netlink_msg msg; | |
7785925d | 569 | |
7c8f5703 | 570 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 571 | |
3aca692d | 572 | list_del(&sl->w1_slave_entry); |
1da177e4 | 573 | |
d2a4ef6a EP |
574 | if (sl->family->fops && sl->family->fops->remove_slave) |
575 | sl->family->fops->remove_slave(sl); | |
576 | ||
12003375 EP |
577 | memset(&msg, 0, sizeof(msg)); |
578 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
579 | msg.type = W1_SLAVE_REMOVE; |
580 | w1_netlink_send(sl->master, &msg); | |
581 | ||
d2a4ef6a EP |
582 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
583 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 584 | device_unregister(&sl->dev); |
1da177e4 | 585 | |
3aca692d EP |
586 | wait_for_completion(&sl->released); |
587 | kfree(sl); | |
1da177e4 LT |
588 | } |
589 | ||
12003375 EP |
590 | struct w1_master *w1_search_master_id(u32 id) |
591 | { | |
592 | struct w1_master *dev; | |
593 | int found = 0; | |
594 | ||
abd52a13 | 595 | mutex_lock(&w1_mlock); |
12003375 EP |
596 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
597 | if (dev->id == id) { | |
598 | found = 1; | |
599 | atomic_inc(&dev->refcnt); | |
600 | break; | |
601 | } | |
602 | } | |
abd52a13 | 603 | mutex_unlock(&w1_mlock); |
12003375 EP |
604 | |
605 | return (found)?dev:NULL; | |
606 | } | |
607 | ||
608 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
609 | { | |
610 | struct w1_master *dev; | |
611 | struct w1_slave *sl = NULL; | |
612 | int found = 0; | |
613 | ||
abd52a13 | 614 | mutex_lock(&w1_mlock); |
12003375 | 615 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 616 | mutex_lock(&dev->mutex); |
12003375 EP |
617 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
618 | if (sl->reg_num.family == id->family && | |
619 | sl->reg_num.id == id->id && | |
620 | sl->reg_num.crc == id->crc) { | |
621 | found = 1; | |
622 | atomic_inc(&dev->refcnt); | |
623 | atomic_inc(&sl->refcnt); | |
624 | break; | |
625 | } | |
626 | } | |
abd52a13 | 627 | mutex_unlock(&dev->mutex); |
12003375 EP |
628 | |
629 | if (found) | |
630 | break; | |
631 | } | |
abd52a13 | 632 | mutex_unlock(&w1_mlock); |
12003375 EP |
633 | |
634 | return (found)?sl:NULL; | |
635 | } | |
636 | ||
c30c9b15 | 637 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 638 | { |
c30c9b15 | 639 | struct w1_slave *sl, *sln; |
6adf87bd EP |
640 | struct w1_master *dev; |
641 | ||
abd52a13 | 642 | mutex_lock(&w1_mlock); |
6adf87bd | 643 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
644 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
645 | "for family %02x.\n", dev->name, f->fid); | |
646 | mutex_lock(&dev->mutex); | |
647 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
648 | /* If it is a new family, slaves with the default | |
649 | * family driver and are that family will be | |
650 | * connected. If the family is going away, devices | |
651 | * matching that family are reconneced. | |
652 | */ | |
653 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
654 | && sl->reg_num.family == f->fid) || | |
655 | (!attach && sl->family->fid == f->fid)) { | |
656 | struct w1_reg_num rn; | |
657 | ||
658 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
659 | w1_slave_detach(sl); | |
660 | ||
661 | w1_attach_slave_device(dev, &rn); | |
662 | } | |
663 | } | |
664 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
665 | "has been finished.\n", dev->name); | |
666 | mutex_unlock(&dev->mutex); | |
6adf87bd | 667 | } |
abd52a13 | 668 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
669 | } |
670 | ||
c30c9b15 | 671 | static void w1_slave_found(struct w1_master *dev, 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; | |
0e65f828 | 677 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 678 | |
c30c9b15 | 679 | atomic_inc(&dev->refcnt); |
7785925d | 680 | |
1da177e4 LT |
681 | tmp = (struct w1_reg_num *) &rn; |
682 | ||
683 | slave_count = 0; | |
684 | list_for_each(ent, &dev->slist) { | |
685 | ||
686 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
687 | ||
688 | if (sl->reg_num.family == tmp->family && | |
689 | sl->reg_num.id == tmp->id && | |
690 | sl->reg_num.crc == tmp->crc) { | |
691 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
692 | break; | |
1da177e4 LT |
693 | } |
694 | ||
695 | slave_count++; | |
696 | } | |
697 | ||
8523ff45 | 698 | if (slave_count == dev->slave_count && |
0e65f828 | 699 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 700 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 701 | } |
7785925d | 702 | |
1da177e4 LT |
703 | atomic_dec(&dev->refcnt); |
704 | } | |
705 | ||
6b729861 EP |
706 | /** |
707 | * Performs a ROM Search & registers any devices found. | |
708 | * The 1-wire search is a simple binary tree search. | |
709 | * For each bit of the address, we read two bits and write one bit. | |
710 | * The bit written will put to sleep all devies that don't match that bit. | |
711 | * When the two reads differ, the direction choice is obvious. | |
712 | * When both bits are 0, we must choose a path to take. | |
713 | * When we can scan all 64 bits without having to choose a path, we are done. | |
714 | * | |
715 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
716 | * | |
717 | * @dev The master device to search | |
718 | * @cb Function to call when a device is found | |
719 | */ | |
12003375 | 720 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 721 | { |
6b729861 EP |
722 | u64 last_rn, rn, tmp64; |
723 | int i, slave_count = 0; | |
724 | int last_zero, last_device; | |
725 | int search_bit, desc_bit; | |
726 | u8 triplet_ret = 0; | |
1da177e4 | 727 | |
6b729861 EP |
728 | search_bit = 0; |
729 | rn = last_rn = 0; | |
730 | last_device = 0; | |
731 | last_zero = -1; | |
1da177e4 LT |
732 | |
733 | desc_bit = 64; | |
734 | ||
6b729861 EP |
735 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
736 | last_rn = rn; | |
1da177e4 LT |
737 | rn = 0; |
738 | ||
1da177e4 LT |
739 | /* |
740 | * Reset bus and all 1-wire device state machines | |
741 | * so they can respond to our requests. | |
742 | * | |
743 | * Return 0 - device(s) present, 1 - no devices present. | |
744 | */ | |
745 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 746 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
747 | break; |
748 | } | |
749 | ||
6b729861 | 750 | /* Start the search */ |
12003375 | 751 | w1_write_8(dev, search_type); |
1da177e4 | 752 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
753 | /* Determine the direction/search bit */ |
754 | if (i == desc_bit) | |
755 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
756 | else if (i > desc_bit) | |
757 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 758 | else |
6b729861 | 759 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 760 | |
6b729861 EP |
761 | /** Read two bits and write one bit */ |
762 | triplet_ret = w1_triplet(dev, search_bit); | |
763 | ||
764 | /* quit if no device responded */ | |
765 | if ( (triplet_ret & 0x03) == 0x03 ) | |
766 | break; | |
1da177e4 | 767 | |
6b729861 EP |
768 | /* If both directions were valid, and we took the 0 path... */ |
769 | if (triplet_ret == 0) | |
770 | last_zero = i; | |
1da177e4 | 771 | |
6b729861 EP |
772 | /* extract the direction taken & update the device number */ |
773 | tmp64 = (triplet_ret >> 2); | |
774 | rn |= (tmp64 << i); | |
0d671b27 DF |
775 | |
776 | if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { | |
777 | printk(KERN_INFO "Abort w1_search (exiting)\n"); | |
778 | return; | |
779 | } | |
6b729861 | 780 | } |
7785925d | 781 | |
6b729861 EP |
782 | if ( (triplet_ret & 0x03) != 0x03 ) { |
783 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
784 | last_device = 1; | |
785 | desc_bit = last_zero; | |
c30c9b15 | 786 | cb(dev, rn); |
6b729861 | 787 | } |
1da177e4 LT |
788 | } |
789 | } | |
790 | ||
12003375 EP |
791 | void w1_search_process(struct w1_master *dev, u8 search_type) |
792 | { | |
793 | struct w1_slave *sl, *sln; | |
794 | ||
795 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
796 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
797 | ||
798 | w1_search_devices(dev, search_type, w1_slave_found); | |
799 | ||
800 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
a2a6c74d | 801 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) |
12003375 | 802 | w1_slave_detach(sl); |
a2a6c74d | 803 | else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
12003375 EP |
804 | sl->ttl = dev->slave_ttl; |
805 | } | |
806 | ||
807 | if (dev->search_count > 0) | |
808 | dev->search_count--; | |
809 | } | |
810 | ||
1da177e4 LT |
811 | int w1_process(void *data) |
812 | { | |
813 | struct w1_master *dev = (struct w1_master *) data; | |
1da177e4 | 814 | |
674a396c | 815 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
01e14d6d DF |
816 | if (dev->search_count) { |
817 | mutex_lock(&dev->mutex); | |
818 | w1_search_process(dev, W1_SEARCH); | |
819 | mutex_unlock(&dev->mutex); | |
820 | } | |
821 | ||
3e1d1d28 | 822 | try_to_freeze(); |
1da177e4 | 823 | msleep_interruptible(w1_timeout * 1000); |
1da177e4 LT |
824 | } |
825 | ||
826 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
827 | |
828 | return 0; | |
829 | } | |
830 | ||
7785925d | 831 | static int w1_init(void) |
1da177e4 LT |
832 | { |
833 | int retval; | |
834 | ||
835 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
836 | ||
12003375 EP |
837 | w1_init_netlink(); |
838 | ||
1da177e4 LT |
839 | retval = bus_register(&w1_bus_type); |
840 | if (retval) { | |
841 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
842 | goto err_out_exit_init; | |
843 | } | |
844 | ||
7f772ed8 | 845 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
846 | if (retval) { |
847 | printk(KERN_ERR | |
848 | "Failed to register master driver. err=%d.\n", | |
849 | retval); | |
850 | goto err_out_bus_unregister; | |
851 | } | |
852 | ||
7f772ed8 EP |
853 | retval = driver_register(&w1_slave_driver); |
854 | if (retval) { | |
855 | printk(KERN_ERR | |
856 | "Failed to register master driver. err=%d.\n", | |
857 | retval); | |
858 | goto err_out_master_unregister; | |
859 | } | |
860 | ||
1da177e4 LT |
861 | return 0; |
862 | ||
c30c9b15 DF |
863 | #if 0 |
864 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
865 | err_out_slave_unregister: |
866 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 867 | #endif |
7f772ed8 EP |
868 | |
869 | err_out_master_unregister: | |
870 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
871 | |
872 | err_out_bus_unregister: | |
873 | bus_unregister(&w1_bus_type); | |
874 | ||
875 | err_out_exit_init: | |
876 | return retval; | |
877 | } | |
878 | ||
7785925d | 879 | static void w1_fini(void) |
1da177e4 LT |
880 | { |
881 | struct w1_master *dev; | |
1da177e4 | 882 | |
c30c9b15 | 883 | /* Set netlink removal messages and some cleanup */ |
7785925d | 884 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 885 | __w1_remove_master_device(dev); |
1da177e4 | 886 | |
12003375 EP |
887 | w1_fini_netlink(); |
888 | ||
7f772ed8 EP |
889 | driver_unregister(&w1_slave_driver); |
890 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
891 | bus_unregister(&w1_bus_type); |
892 | } | |
893 | ||
894 | module_init(w1_init); | |
895 | module_exit(w1_fini); |