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; | |
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 | ||
9b467411 DF |
59 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); |
60 | ||
1da177e4 LT |
61 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
62 | { | |
63 | return 1; | |
64 | } | |
65 | ||
66 | static int w1_master_probe(struct device *dev) | |
67 | { | |
68 | return -ENODEV; | |
69 | } | |
70 | ||
1da177e4 LT |
71 | static void w1_master_release(struct device *dev) |
72 | { | |
db2d0008 | 73 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
74 | |
75 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
76 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
77 | kfree(md); | |
1da177e4 LT |
78 | } |
79 | ||
80 | static void w1_slave_release(struct device *dev) | |
81 | { | |
db2d0008 | 82 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 83 | |
12003375 | 84 | printk("%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
85 | |
86 | while (atomic_read(&sl->refcnt)) { | |
12003375 | 87 | printk("Waiting for %s to become free: refcnt=%d.\n", |
3aca692d EP |
88 | sl->name, atomic_read(&sl->refcnt)); |
89 | if (msleep_interruptible(1000)) | |
90 | flush_signals(current); | |
91 | } | |
92 | ||
93 | w1_family_put(sl->family); | |
94 | sl->master->slave_count--; | |
95 | ||
96 | complete(&sl->released); | |
1da177e4 LT |
97 | } |
98 | ||
d2a4ef6a | 99 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 100 | { |
3aca692d | 101 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 102 | |
3aca692d | 103 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
104 | } |
105 | ||
91a69029 ZR |
106 | static ssize_t w1_slave_read_id(struct kobject *kobj, |
107 | struct bin_attribute *bin_attr, | |
108 | 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 | 137 | |
91a69029 ZR |
138 | static ssize_t w1_default_write(struct kobject *kobj, |
139 | struct bin_attribute *bin_attr, | |
140 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
141 | { |
142 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
143 | ||
abd52a13 | 144 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
145 | if (w1_reset_select_slave(sl)) { |
146 | count = 0; | |
147 | goto out_up; | |
148 | } | |
149 | ||
150 | w1_write_block(sl->master, buf, count); | |
151 | ||
152 | out_up: | |
abd52a13 | 153 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
154 | return count; |
155 | } | |
156 | ||
91a69029 ZR |
157 | static ssize_t w1_default_read(struct kobject *kobj, |
158 | struct bin_attribute *bin_attr, | |
159 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
160 | { |
161 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
162 | ||
abd52a13 | 163 | mutex_lock(&sl->master->mutex); |
f522d239 | 164 | w1_read_block(sl->master, buf, count); |
abd52a13 | 165 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
166 | return count; |
167 | } | |
168 | ||
169 | static struct bin_attribute w1_default_attr = { | |
170 | .attr = { | |
171 | .name = "rw", | |
172 | .mode = S_IRUGO | S_IWUSR, | |
f522d239 EP |
173 | }, |
174 | .size = PAGE_SIZE, | |
175 | .read = w1_default_read, | |
176 | .write = w1_default_write, | |
177 | }; | |
178 | ||
179 | static int w1_default_add_slave(struct w1_slave *sl) | |
180 | { | |
181 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
182 | } | |
183 | ||
184 | static void w1_default_remove_slave(struct w1_slave *sl) | |
185 | { | |
186 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
187 | } | |
188 | ||
189 | static struct w1_family_ops w1_default_fops = { | |
190 | .add_slave = w1_default_add_slave, | |
191 | .remove_slave = w1_default_remove_slave, | |
192 | }; | |
193 | ||
194 | static struct w1_family w1_default_family = { | |
195 | .fops = &w1_default_fops, | |
196 | }; | |
d2a4ef6a | 197 | |
7eff2e7a | 198 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 199 | |
1da177e4 LT |
200 | static struct bus_type w1_bus_type = { |
201 | .name = "w1", | |
202 | .match = w1_master_match, | |
312c004d | 203 | .uevent = w1_uevent, |
1da177e4 LT |
204 | }; |
205 | ||
7f772ed8 EP |
206 | struct device_driver w1_master_driver = { |
207 | .name = "w1_master_driver", | |
1da177e4 LT |
208 | .bus = &w1_bus_type, |
209 | .probe = w1_master_probe, | |
1da177e4 LT |
210 | }; |
211 | ||
7f772ed8 | 212 | struct device w1_master_device = { |
1da177e4 LT |
213 | .parent = NULL, |
214 | .bus = &w1_bus_type, | |
215 | .bus_id = "w1 bus master", | |
7f772ed8 | 216 | .driver = &w1_master_driver, |
1da177e4 LT |
217 | .release = &w1_master_release |
218 | }; | |
219 | ||
2c5bfdac | 220 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
221 | .name = "w1_slave_driver", |
222 | .bus = &w1_bus_type, | |
223 | }; | |
224 | ||
2c5bfdac | 225 | #if 0 |
7f772ed8 EP |
226 | struct device w1_slave_device = { |
227 | .parent = NULL, | |
228 | .bus = &w1_bus_type, | |
229 | .bus_id = "w1 bus slave", | |
230 | .driver = &w1_slave_driver, | |
3aca692d | 231 | .release = &w1_slave_release |
7f772ed8 | 232 | }; |
2c5bfdac | 233 | #endif /* 0 */ |
7f772ed8 | 234 | |
060b8845 | 235 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 236 | { |
db2d0008 | 237 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 238 | ssize_t count; |
7785925d | 239 | |
abd52a13 | 240 | mutex_lock(&md->mutex); |
1da177e4 | 241 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 242 | mutex_unlock(&md->mutex); |
1da177e4 LT |
243 | |
244 | return count; | |
245 | } | |
246 | ||
2a9d0c17 EP |
247 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
248 | struct device_attribute *attr, | |
249 | const char * buf, size_t count) | |
250 | { | |
6a158c0d | 251 | long tmp; |
db2d0008 | 252 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 | 253 | |
6a158c0d DF |
254 | if (strict_strtol(buf, 0, &tmp) == -EINVAL) |
255 | return -EINVAL; | |
256 | ||
abd52a13 | 257 | mutex_lock(&md->mutex); |
6a158c0d | 258 | md->search_count = tmp; |
abd52a13 | 259 | mutex_unlock(&md->mutex); |
3c52e4e6 | 260 | wake_up_process(md->thread); |
2a9d0c17 EP |
261 | |
262 | return count; | |
263 | } | |
264 | ||
265 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
266 | struct device_attribute *attr, | |
267 | char *buf) | |
268 | { | |
db2d0008 | 269 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
270 | ssize_t count; |
271 | ||
abd52a13 | 272 | mutex_lock(&md->mutex); |
2a9d0c17 | 273 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 274 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
275 | |
276 | return count; | |
277 | } | |
278 | ||
6a158c0d DF |
279 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
280 | struct device_attribute *attr, | |
281 | const char *buf, size_t count) | |
282 | { | |
283 | long tmp; | |
284 | struct w1_master *md = dev_to_w1_master(dev); | |
285 | ||
286 | if (strict_strtol(buf, 0, &tmp) == -EINVAL) | |
287 | return -EINVAL; | |
288 | ||
289 | mutex_lock(&md->mutex); | |
290 | md->enable_pullup = tmp; | |
291 | mutex_unlock(&md->mutex); | |
292 | wake_up_process(md->thread); | |
293 | ||
294 | return count; | |
295 | } | |
296 | ||
297 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
298 | struct device_attribute *attr, | |
299 | char *buf) | |
300 | { | |
301 | struct w1_master *md = dev_to_w1_master(dev); | |
302 | ssize_t count; | |
303 | ||
304 | mutex_lock(&md->mutex); | |
305 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
306 | mutex_unlock(&md->mutex); | |
307 | ||
308 | return count; | |
309 | } | |
310 | ||
060b8845 | 311 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 312 | { |
db2d0008 | 313 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 314 | ssize_t count; |
7785925d | 315 | |
abd52a13 | 316 | mutex_lock(&md->mutex); |
1da177e4 | 317 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 318 | mutex_unlock(&md->mutex); |
1da177e4 LT |
319 | return count; |
320 | } | |
321 | ||
060b8845 | 322 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
323 | { |
324 | ssize_t count; | |
325 | count = sprintf(buf, "%d\n", w1_timeout); | |
326 | return count; | |
327 | } | |
328 | ||
060b8845 | 329 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 330 | { |
db2d0008 | 331 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 332 | ssize_t count; |
7785925d | 333 | |
abd52a13 | 334 | mutex_lock(&md->mutex); |
1da177e4 | 335 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 336 | mutex_unlock(&md->mutex); |
1da177e4 LT |
337 | return count; |
338 | } | |
339 | ||
060b8845 | 340 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 341 | { |
db2d0008 | 342 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 343 | ssize_t count; |
7785925d | 344 | |
abd52a13 | 345 | mutex_lock(&md->mutex); |
1da177e4 | 346 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 347 | mutex_unlock(&md->mutex); |
1da177e4 LT |
348 | return count; |
349 | } | |
350 | ||
060b8845 | 351 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 352 | { |
db2d0008 | 353 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 354 | ssize_t count; |
7785925d | 355 | |
abd52a13 | 356 | mutex_lock(&md->mutex); |
1da177e4 | 357 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 358 | mutex_unlock(&md->mutex); |
1da177e4 LT |
359 | return count; |
360 | } | |
361 | ||
9b467411 DF |
362 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
363 | struct device_attribute *attr, char *buf) | |
1da177e4 | 364 | { |
db2d0008 | 365 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
366 | int c = PAGE_SIZE; |
367 | ||
abd52a13 | 368 | mutex_lock(&md->mutex); |
1da177e4 LT |
369 | |
370 | if (md->slave_count == 0) | |
371 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
372 | else { | |
373 | struct list_head *ent, *n; | |
374 | struct w1_slave *sl; | |
375 | ||
376 | list_for_each_safe(ent, n, &md->slist) { | |
377 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
378 | ||
7785925d | 379 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
380 | } |
381 | } | |
382 | ||
abd52a13 | 383 | mutex_unlock(&md->mutex); |
1da177e4 LT |
384 | |
385 | return PAGE_SIZE - c; | |
386 | } | |
387 | ||
9b467411 DF |
388 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
389 | struct device_attribute *attr, char *buf) | |
390 | { | |
391 | int c = PAGE_SIZE; | |
392 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
393 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
394 | return PAGE_SIZE - c; | |
395 | } | |
396 | ||
397 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
398 | struct w1_reg_num *rn) | |
399 | { | |
400 | unsigned int family; | |
401 | unsigned long long id; | |
402 | int i; | |
403 | u64 rn64_le; | |
404 | ||
405 | /* The CRC value isn't read from the user because the sysfs directory | |
406 | * doesn't include it and most messages from the bus search don't | |
407 | * print it either. It would be unreasonable for the user to then | |
408 | * provide it. | |
409 | */ | |
410 | const char *error_msg = "bad slave string format, expecting " | |
411 | "ff-dddddddddddd\n"; | |
412 | ||
413 | if (buf[2] != '-') { | |
414 | dev_err(dev, "%s", error_msg); | |
415 | return -EINVAL; | |
416 | } | |
417 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
418 | if (i != 2) { | |
419 | dev_err(dev, "%s", error_msg); | |
420 | return -EINVAL; | |
421 | } | |
422 | rn->family = family; | |
423 | rn->id = id; | |
424 | ||
425 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
426 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
427 | ||
428 | #if 0 | |
429 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
430 | rn->family, (unsigned long long)rn->id, rn->crc); | |
431 | #endif | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
437 | * Note: must hold the mutex | |
438 | */ | |
439 | static struct w1_slave *w1_slave_search_device(struct w1_master *dev, | |
440 | struct w1_reg_num *rn) | |
441 | { | |
442 | struct w1_slave *sl; | |
443 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { | |
444 | if (sl->reg_num.family == rn->family && | |
445 | sl->reg_num.id == rn->id && | |
446 | sl->reg_num.crc == rn->crc) { | |
447 | return sl; | |
448 | } | |
449 | } | |
450 | return NULL; | |
451 | } | |
452 | ||
453 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
454 | struct device_attribute *attr, | |
455 | const char *buf, size_t count) | |
456 | { | |
457 | struct w1_master *md = dev_to_w1_master(dev); | |
458 | struct w1_reg_num rn; | |
459 | struct w1_slave *sl; | |
460 | ssize_t result = count; | |
461 | ||
462 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
463 | return -EINVAL; | |
464 | ||
465 | mutex_lock(&md->mutex); | |
466 | sl = w1_slave_search_device(md, &rn); | |
467 | /* It would be nice to do a targeted search one the one-wire bus | |
468 | * for the new device to see if it is out there or not. But the | |
469 | * current search doesn't support that. | |
470 | */ | |
471 | if (sl) { | |
472 | dev_info(dev, "Device %s already exists\n", sl->name); | |
473 | result = -EINVAL; | |
474 | } else { | |
475 | w1_attach_slave_device(md, &rn); | |
476 | } | |
477 | mutex_unlock(&md->mutex); | |
478 | ||
479 | return result; | |
480 | } | |
481 | ||
482 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
483 | struct device_attribute *attr, char *buf) | |
484 | { | |
485 | int c = PAGE_SIZE; | |
486 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
487 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
488 | return PAGE_SIZE - c; | |
489 | } | |
490 | ||
491 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
492 | struct device_attribute *attr, | |
493 | const char *buf, size_t count) | |
494 | { | |
495 | struct w1_master *md = dev_to_w1_master(dev); | |
496 | struct w1_reg_num rn; | |
497 | struct w1_slave *sl; | |
498 | ssize_t result = count; | |
499 | ||
500 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
501 | return -EINVAL; | |
502 | ||
503 | mutex_lock(&md->mutex); | |
504 | sl = w1_slave_search_device(md, &rn); | |
505 | if (sl) { | |
506 | w1_slave_detach(sl); | |
507 | } else { | |
508 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
509 | (unsigned long long)rn.id); | |
510 | result = -EINVAL; | |
511 | } | |
512 | mutex_unlock(&md->mutex); | |
513 | ||
514 | return result; | |
515 | } | |
516 | ||
7785925d EP |
517 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
518 | struct device_attribute w1_master_attribute_##_name = \ | |
519 | __ATTR(w1_master_##_name, _mode, \ | |
520 | w1_master_attribute_show_##_name, NULL) | |
521 | ||
2a9d0c17 EP |
522 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
523 | struct device_attribute w1_master_attribute_##_name = \ | |
524 | __ATTR(w1_master_##_name, _mode, \ | |
525 | w1_master_attribute_show_##_name, \ | |
526 | w1_master_attribute_store_##_name) | |
527 | ||
7785925d EP |
528 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
529 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
530 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
531 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
532 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
533 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
534 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 535 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
6a158c0d | 536 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO); |
9b467411 DF |
537 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUGO); |
538 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUGO); | |
7785925d EP |
539 | |
540 | static struct attribute *w1_master_default_attrs[] = { | |
541 | &w1_master_attribute_name.attr, | |
542 | &w1_master_attribute_slaves.attr, | |
543 | &w1_master_attribute_slave_count.attr, | |
544 | &w1_master_attribute_max_slave_count.attr, | |
545 | &w1_master_attribute_attempts.attr, | |
546 | &w1_master_attribute_timeout.attr, | |
547 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 548 | &w1_master_attribute_search.attr, |
6a158c0d | 549 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
550 | &w1_master_attribute_add.attr, |
551 | &w1_master_attribute_remove.attr, | |
7785925d | 552 | NULL |
1da177e4 LT |
553 | }; |
554 | ||
7785925d EP |
555 | static struct attribute_group w1_master_defattr_group = { |
556 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
557 | }; |
558 | ||
7785925d EP |
559 | int w1_create_master_attributes(struct w1_master *master) |
560 | { | |
561 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
562 | } | |
563 | ||
c30c9b15 | 564 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
565 | { |
566 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
567 | } | |
568 | ||
7f772ed8 | 569 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 570 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
571 | { |
572 | struct w1_master *md = NULL; | |
573 | struct w1_slave *sl = NULL; | |
574 | char *event_owner, *name; | |
7eff2e7a | 575 | int err; |
7f772ed8 EP |
576 | |
577 | if (dev->driver == &w1_master_driver) { | |
578 | md = container_of(dev, struct w1_master, dev); | |
579 | event_owner = "master"; | |
580 | name = md->name; | |
581 | } else if (dev->driver == &w1_slave_driver) { | |
582 | sl = container_of(dev, struct w1_slave, dev); | |
583 | event_owner = "slave"; | |
584 | name = sl->name; | |
585 | } else { | |
312c004d | 586 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
587 | return -EINVAL; |
588 | } | |
589 | ||
c6976a4e AM |
590 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
591 | event_owner, name, dev->bus_id); | |
7f772ed8 EP |
592 | |
593 | if (dev->driver != &w1_slave_driver || !sl) | |
594 | return 0; | |
595 | ||
7eff2e7a | 596 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 EP |
597 | if (err) |
598 | return err; | |
599 | ||
7eff2e7a KS |
600 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
601 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
602 | if (err) |
603 | return err; | |
604 | ||
605 | return 0; | |
606 | }; | |
607 | #else | |
7eff2e7a | 608 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
609 | { |
610 | return 0; | |
611 | } | |
612 | #endif | |
613 | ||
1da177e4 LT |
614 | static int __w1_attach_slave_device(struct w1_slave *sl) |
615 | { | |
616 | int err; | |
617 | ||
618 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 619 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
620 | sl->dev.bus = &w1_bus_type; |
621 | sl->dev.release = &w1_slave_release; | |
622 | ||
623 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
624 | "%02x-%012llx", |
625 | (unsigned int) sl->reg_num.family, | |
626 | (unsigned long long) sl->reg_num.id); | |
627 | snprintf(&sl->name[0], sizeof(sl->name), | |
628 | "%02x-%012llx", | |
629 | (unsigned int) sl->reg_num.family, | |
630 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 631 | |
c6976a4e | 632 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
60ed34be | 633 | &sl->dev.bus_id[0], sl); |
1da177e4 LT |
634 | |
635 | err = device_register(&sl->dev); | |
636 | if (err < 0) { | |
637 | dev_err(&sl->dev, | |
6b729861 EP |
638 | "Device registration [%s] failed. err=%d\n", |
639 | sl->dev.bus_id, err); | |
1da177e4 LT |
640 | return err; |
641 | } | |
642 | ||
d2a4ef6a EP |
643 | /* Create "name" entry */ |
644 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
645 | if (err < 0) { | |
646 | dev_err(&sl->dev, | |
647 | "sysfs file creation for [%s] failed. err=%d\n", | |
648 | sl->dev.bus_id, err); | |
649 | goto out_unreg; | |
650 | } | |
1da177e4 | 651 | |
d2a4ef6a EP |
652 | /* Create "id" entry */ |
653 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
654 | if (err < 0) { |
655 | dev_err(&sl->dev, | |
6b729861 EP |
656 | "sysfs file creation for [%s] failed. err=%d\n", |
657 | sl->dev.bus_id, err); | |
d2a4ef6a | 658 | goto out_rem1; |
1da177e4 LT |
659 | } |
660 | ||
d2a4ef6a EP |
661 | /* if the family driver needs to initialize something... */ |
662 | if (sl->family->fops && sl->family->fops->add_slave && | |
663 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
664 | dev_err(&sl->dev, | |
665 | "sysfs file creation for [%s] failed. err=%d\n", | |
666 | sl->dev.bus_id, err); | |
667 | goto out_rem2; | |
1da177e4 LT |
668 | } |
669 | ||
670 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
671 | ||
672 | return 0; | |
d2a4ef6a EP |
673 | |
674 | out_rem2: | |
675 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
676 | out_rem1: | |
677 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
678 | out_unreg: | |
679 | device_unregister(&sl->dev); | |
680 | return err; | |
1da177e4 LT |
681 | } |
682 | ||
683 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
684 | { | |
685 | struct w1_slave *sl; | |
686 | struct w1_family *f; | |
687 | int err; | |
688 | struct w1_netlink_msg msg; | |
689 | ||
dd00cc48 | 690 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
691 | if (!sl) { |
692 | dev_err(&dev->dev, | |
693 | "%s: failed to allocate new slave device.\n", | |
694 | __func__); | |
695 | return -ENOMEM; | |
696 | } | |
697 | ||
1da177e4 LT |
698 | |
699 | sl->owner = THIS_MODULE; | |
700 | sl->master = dev; | |
701 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
702 | ||
12003375 | 703 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
704 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
705 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 706 | init_completion(&sl->released); |
1da177e4 LT |
707 | |
708 | spin_lock(&w1_flock); | |
709 | f = w1_family_registered(rn->family); | |
710 | if (!f) { | |
99c5bfe9 | 711 | f= &w1_default_family; |
1da177e4 LT |
712 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
713 | rn->family, rn->family, | |
714 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
715 | } |
716 | __w1_family_get(f); | |
717 | spin_unlock(&w1_flock); | |
718 | ||
719 | sl->family = f; | |
720 | ||
721 | ||
722 | err = __w1_attach_slave_device(sl); | |
723 | if (err < 0) { | |
724 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
725 | sl->name); | |
726 | w1_family_put(sl->family); | |
727 | kfree(sl); | |
728 | return err; | |
729 | } | |
730 | ||
731 | sl->ttl = dev->slave_ttl; | |
732 | dev->slave_count++; | |
733 | ||
12003375 | 734 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
735 | msg.type = W1_SLAVE_ADD; |
736 | w1_netlink_send(dev, &msg); | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
c30c9b15 | 741 | void w1_slave_detach(struct w1_slave *sl) |
1da177e4 LT |
742 | { |
743 | struct w1_netlink_msg msg; | |
7785925d | 744 | |
7c8f5703 | 745 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 746 | |
3aca692d | 747 | list_del(&sl->w1_slave_entry); |
1da177e4 | 748 | |
d2a4ef6a EP |
749 | if (sl->family->fops && sl->family->fops->remove_slave) |
750 | sl->family->fops->remove_slave(sl); | |
751 | ||
12003375 EP |
752 | memset(&msg, 0, sizeof(msg)); |
753 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
754 | msg.type = W1_SLAVE_REMOVE; |
755 | w1_netlink_send(sl->master, &msg); | |
756 | ||
d2a4ef6a EP |
757 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
758 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 759 | device_unregister(&sl->dev); |
1da177e4 | 760 | |
3aca692d EP |
761 | wait_for_completion(&sl->released); |
762 | kfree(sl); | |
1da177e4 LT |
763 | } |
764 | ||
12003375 EP |
765 | struct w1_master *w1_search_master_id(u32 id) |
766 | { | |
767 | struct w1_master *dev; | |
768 | int found = 0; | |
769 | ||
abd52a13 | 770 | mutex_lock(&w1_mlock); |
12003375 EP |
771 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
772 | if (dev->id == id) { | |
773 | found = 1; | |
774 | atomic_inc(&dev->refcnt); | |
775 | break; | |
776 | } | |
777 | } | |
abd52a13 | 778 | mutex_unlock(&w1_mlock); |
12003375 EP |
779 | |
780 | return (found)?dev:NULL; | |
781 | } | |
782 | ||
783 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
784 | { | |
785 | struct w1_master *dev; | |
786 | struct w1_slave *sl = NULL; | |
787 | int found = 0; | |
788 | ||
abd52a13 | 789 | mutex_lock(&w1_mlock); |
12003375 | 790 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 791 | mutex_lock(&dev->mutex); |
12003375 EP |
792 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
793 | if (sl->reg_num.family == id->family && | |
794 | sl->reg_num.id == id->id && | |
795 | sl->reg_num.crc == id->crc) { | |
796 | found = 1; | |
797 | atomic_inc(&dev->refcnt); | |
798 | atomic_inc(&sl->refcnt); | |
799 | break; | |
800 | } | |
801 | } | |
abd52a13 | 802 | mutex_unlock(&dev->mutex); |
12003375 EP |
803 | |
804 | if (found) | |
805 | break; | |
806 | } | |
abd52a13 | 807 | mutex_unlock(&w1_mlock); |
12003375 EP |
808 | |
809 | return (found)?sl:NULL; | |
810 | } | |
811 | ||
c30c9b15 | 812 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 813 | { |
c30c9b15 | 814 | struct w1_slave *sl, *sln; |
6adf87bd EP |
815 | struct w1_master *dev; |
816 | ||
abd52a13 | 817 | mutex_lock(&w1_mlock); |
6adf87bd | 818 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
819 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
820 | "for family %02x.\n", dev->name, f->fid); | |
821 | mutex_lock(&dev->mutex); | |
822 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
823 | /* If it is a new family, slaves with the default | |
824 | * family driver and are that family will be | |
825 | * connected. If the family is going away, devices | |
826 | * matching that family are reconneced. | |
827 | */ | |
828 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
829 | && sl->reg_num.family == f->fid) || | |
830 | (!attach && sl->family->fid == f->fid)) { | |
831 | struct w1_reg_num rn; | |
832 | ||
833 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
834 | w1_slave_detach(sl); | |
835 | ||
836 | w1_attach_slave_device(dev, &rn); | |
837 | } | |
838 | } | |
839 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
840 | "has been finished.\n", dev->name); | |
841 | mutex_unlock(&dev->mutex); | |
6adf87bd | 842 | } |
abd52a13 | 843 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
844 | } |
845 | ||
c30c9b15 | 846 | static void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 LT |
847 | { |
848 | int slave_count; | |
849 | struct w1_slave *sl; | |
850 | struct list_head *ent; | |
851 | struct w1_reg_num *tmp; | |
0e65f828 | 852 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 853 | |
c30c9b15 | 854 | atomic_inc(&dev->refcnt); |
7785925d | 855 | |
1da177e4 LT |
856 | tmp = (struct w1_reg_num *) &rn; |
857 | ||
858 | slave_count = 0; | |
859 | list_for_each(ent, &dev->slist) { | |
860 | ||
861 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
862 | ||
863 | if (sl->reg_num.family == tmp->family && | |
864 | sl->reg_num.id == tmp->id && | |
865 | sl->reg_num.crc == tmp->crc) { | |
866 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
867 | break; | |
1da177e4 LT |
868 | } |
869 | ||
870 | slave_count++; | |
871 | } | |
872 | ||
8523ff45 | 873 | if (slave_count == dev->slave_count && |
0e65f828 | 874 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 875 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 876 | } |
7785925d | 877 | |
1da177e4 LT |
878 | atomic_dec(&dev->refcnt); |
879 | } | |
880 | ||
6b729861 EP |
881 | /** |
882 | * Performs a ROM Search & registers any devices found. | |
883 | * The 1-wire search is a simple binary tree search. | |
884 | * For each bit of the address, we read two bits and write one bit. | |
885 | * The bit written will put to sleep all devies that don't match that bit. | |
886 | * When the two reads differ, the direction choice is obvious. | |
887 | * When both bits are 0, we must choose a path to take. | |
888 | * When we can scan all 64 bits without having to choose a path, we are done. | |
889 | * | |
890 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
891 | * | |
892 | * @dev The master device to search | |
893 | * @cb Function to call when a device is found | |
894 | */ | |
12003375 | 895 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 896 | { |
6b729861 EP |
897 | u64 last_rn, rn, tmp64; |
898 | int i, slave_count = 0; | |
899 | int last_zero, last_device; | |
900 | int search_bit, desc_bit; | |
901 | u8 triplet_ret = 0; | |
1da177e4 | 902 | |
6b729861 EP |
903 | search_bit = 0; |
904 | rn = last_rn = 0; | |
905 | last_device = 0; | |
906 | last_zero = -1; | |
1da177e4 LT |
907 | |
908 | desc_bit = 64; | |
909 | ||
6b729861 EP |
910 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
911 | last_rn = rn; | |
1da177e4 LT |
912 | rn = 0; |
913 | ||
1da177e4 LT |
914 | /* |
915 | * Reset bus and all 1-wire device state machines | |
916 | * so they can respond to our requests. | |
917 | * | |
918 | * Return 0 - device(s) present, 1 - no devices present. | |
919 | */ | |
920 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 921 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
922 | break; |
923 | } | |
924 | ||
6b729861 | 925 | /* Start the search */ |
12003375 | 926 | w1_write_8(dev, search_type); |
1da177e4 | 927 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
928 | /* Determine the direction/search bit */ |
929 | if (i == desc_bit) | |
930 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
931 | else if (i > desc_bit) | |
932 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 933 | else |
6b729861 | 934 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 935 | |
6b729861 EP |
936 | /** Read two bits and write one bit */ |
937 | triplet_ret = w1_triplet(dev, search_bit); | |
938 | ||
939 | /* quit if no device responded */ | |
940 | if ( (triplet_ret & 0x03) == 0x03 ) | |
941 | break; | |
1da177e4 | 942 | |
6b729861 EP |
943 | /* If both directions were valid, and we took the 0 path... */ |
944 | if (triplet_ret == 0) | |
945 | last_zero = i; | |
1da177e4 | 946 | |
6b729861 EP |
947 | /* extract the direction taken & update the device number */ |
948 | tmp64 = (triplet_ret >> 2); | |
949 | rn |= (tmp64 << i); | |
0d671b27 | 950 | |
3c52e4e6 | 951 | if (kthread_should_stop()) { |
0d671b27 DF |
952 | printk(KERN_INFO "Abort w1_search (exiting)\n"); |
953 | return; | |
954 | } | |
6b729861 | 955 | } |
7785925d | 956 | |
6b729861 EP |
957 | if ( (triplet_ret & 0x03) != 0x03 ) { |
958 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
959 | last_device = 1; | |
960 | desc_bit = last_zero; | |
c30c9b15 | 961 | cb(dev, rn); |
6b729861 | 962 | } |
1da177e4 LT |
963 | } |
964 | } | |
965 | ||
12003375 EP |
966 | void w1_search_process(struct w1_master *dev, u8 search_type) |
967 | { | |
968 | struct w1_slave *sl, *sln; | |
969 | ||
970 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
971 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
972 | ||
973 | w1_search_devices(dev, search_type, w1_slave_found); | |
974 | ||
975 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
a2a6c74d | 976 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) |
12003375 | 977 | w1_slave_detach(sl); |
a2a6c74d | 978 | else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
12003375 EP |
979 | sl->ttl = dev->slave_ttl; |
980 | } | |
981 | ||
982 | if (dev->search_count > 0) | |
983 | dev->search_count--; | |
984 | } | |
985 | ||
1da177e4 LT |
986 | int w1_process(void *data) |
987 | { | |
988 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
989 | /* As long as w1_timeout is only set by a module parameter the sleep |
990 | * time can be calculated in jiffies once. | |
991 | */ | |
992 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); | |
1da177e4 | 993 | |
3c52e4e6 | 994 | while (!kthread_should_stop()) { |
01e14d6d DF |
995 | if (dev->search_count) { |
996 | mutex_lock(&dev->mutex); | |
997 | w1_search_process(dev, W1_SEARCH); | |
998 | mutex_unlock(&dev->mutex); | |
999 | } | |
1000 | ||
3e1d1d28 | 1001 | try_to_freeze(); |
3c52e4e6 DF |
1002 | __set_current_state(TASK_INTERRUPTIBLE); |
1003 | ||
1004 | if (kthread_should_stop()) | |
1005 | break; | |
1006 | ||
1007 | /* Only sleep when the search is active. */ | |
1008 | if (dev->search_count) | |
1009 | schedule_timeout(jtime); | |
1010 | else | |
1011 | schedule(); | |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1015 | |
1016 | return 0; | |
1017 | } | |
1018 | ||
7785925d | 1019 | static int w1_init(void) |
1da177e4 LT |
1020 | { |
1021 | int retval; | |
1022 | ||
1023 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
1024 | ||
12003375 EP |
1025 | w1_init_netlink(); |
1026 | ||
1da177e4 LT |
1027 | retval = bus_register(&w1_bus_type); |
1028 | if (retval) { | |
1029 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
1030 | goto err_out_exit_init; | |
1031 | } | |
1032 | ||
7f772ed8 | 1033 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
1034 | if (retval) { |
1035 | printk(KERN_ERR | |
1036 | "Failed to register master driver. err=%d.\n", | |
1037 | retval); | |
1038 | goto err_out_bus_unregister; | |
1039 | } | |
1040 | ||
7f772ed8 EP |
1041 | retval = driver_register(&w1_slave_driver); |
1042 | if (retval) { | |
1043 | printk(KERN_ERR | |
1044 | "Failed to register master driver. err=%d.\n", | |
1045 | retval); | |
1046 | goto err_out_master_unregister; | |
1047 | } | |
1048 | ||
1da177e4 LT |
1049 | return 0; |
1050 | ||
c30c9b15 DF |
1051 | #if 0 |
1052 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1053 | err_out_slave_unregister: |
1054 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1055 | #endif |
7f772ed8 EP |
1056 | |
1057 | err_out_master_unregister: | |
1058 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1059 | |
1060 | err_out_bus_unregister: | |
1061 | bus_unregister(&w1_bus_type); | |
1062 | ||
1063 | err_out_exit_init: | |
1064 | return retval; | |
1065 | } | |
1066 | ||
7785925d | 1067 | static void w1_fini(void) |
1da177e4 LT |
1068 | { |
1069 | struct w1_master *dev; | |
1da177e4 | 1070 | |
c30c9b15 | 1071 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1072 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1073 | __w1_remove_master_device(dev); |
1da177e4 | 1074 | |
12003375 EP |
1075 | w1_fini_netlink(); |
1076 | ||
7f772ed8 EP |
1077 | driver_unregister(&w1_slave_driver); |
1078 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1079 | bus_unregister(&w1_bus_type); |
1080 | } | |
1081 | ||
1082 | module_init(w1_init); | |
1083 | module_exit(w1_fini); |