Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 | 3 | * |
a8018766 | 4 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
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 | 35 | |
60063497 | 36 | #include <linux/atomic.h> |
1da177e4 LT |
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"); | |
a8018766 | 45 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
1da177e4 LT |
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 | |
7dc8f527 | 84 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
85 | |
86 | while (atomic_read(&sl->refcnt)) { | |
7dc8f527 | 87 | dev_dbg(dev, "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 | ||
5b187b3c | 99 | static ssize_t name_show(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 | 104 | } |
5b187b3c | 105 | static DEVICE_ATTR_RO(name); |
1da177e4 | 106 | |
5b187b3c | 107 | static ssize_t id_show(struct device *dev, |
07e00341 | 108 | struct device_attribute *attr, char *buf) |
1da177e4 | 109 | { |
07e00341 DF |
110 | struct w1_slave *sl = dev_to_w1_slave(dev); |
111 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 112 | |
07e00341 | 113 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 114 | return count; |
3aca692d | 115 | } |
5b187b3c | 116 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 117 | |
5b187b3c GKH |
118 | static struct attribute *w1_slave_attrs[] = { |
119 | &dev_attr_name.attr, | |
120 | &dev_attr_id.attr, | |
121 | NULL, | |
122 | }; | |
123 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 124 | |
d2a4ef6a | 125 | /* Default family */ |
f522d239 | 126 | |
36c27a65 GKH |
127 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
128 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
129 | size_t count) | |
f522d239 EP |
130 | { |
131 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
132 | ||
abd52a13 | 133 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
134 | if (w1_reset_select_slave(sl)) { |
135 | count = 0; | |
136 | goto out_up; | |
137 | } | |
138 | ||
139 | w1_write_block(sl->master, buf, count); | |
140 | ||
141 | out_up: | |
abd52a13 | 142 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
143 | return count; |
144 | } | |
145 | ||
36c27a65 GKH |
146 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
147 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
148 | size_t count) | |
f522d239 EP |
149 | { |
150 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
151 | ||
abd52a13 | 152 | mutex_lock(&sl->master->mutex); |
f522d239 | 153 | w1_read_block(sl->master, buf, count); |
abd52a13 | 154 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
155 | return count; |
156 | } | |
157 | ||
36c27a65 GKH |
158 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
159 | ||
160 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
161 | &bin_attr_rw, | |
162 | NULL, | |
f522d239 EP |
163 | }; |
164 | ||
36c27a65 GKH |
165 | static const struct attribute_group w1_slave_default_group = { |
166 | .bin_attrs = w1_slave_bin_attrs, | |
167 | }; | |
f522d239 | 168 | |
36c27a65 GKH |
169 | static const struct attribute_group *w1_slave_default_groups[] = { |
170 | &w1_slave_default_group, | |
171 | NULL, | |
172 | }; | |
f522d239 EP |
173 | |
174 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 175 | .groups = w1_slave_default_groups, |
f522d239 EP |
176 | }; |
177 | ||
178 | static struct w1_family w1_default_family = { | |
179 | .fops = &w1_default_fops, | |
180 | }; | |
d2a4ef6a | 181 | |
7eff2e7a | 182 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 183 | |
1da177e4 LT |
184 | static struct bus_type w1_bus_type = { |
185 | .name = "w1", | |
186 | .match = w1_master_match, | |
312c004d | 187 | .uevent = w1_uevent, |
1da177e4 LT |
188 | }; |
189 | ||
7f772ed8 EP |
190 | struct device_driver w1_master_driver = { |
191 | .name = "w1_master_driver", | |
1da177e4 LT |
192 | .bus = &w1_bus_type, |
193 | .probe = w1_master_probe, | |
1da177e4 LT |
194 | }; |
195 | ||
7f772ed8 | 196 | struct device w1_master_device = { |
1da177e4 LT |
197 | .parent = NULL, |
198 | .bus = &w1_bus_type, | |
40f91de6 | 199 | .init_name = "w1 bus master", |
7f772ed8 | 200 | .driver = &w1_master_driver, |
1da177e4 LT |
201 | .release = &w1_master_release |
202 | }; | |
203 | ||
2c5bfdac | 204 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
205 | .name = "w1_slave_driver", |
206 | .bus = &w1_bus_type, | |
207 | }; | |
208 | ||
2c5bfdac | 209 | #if 0 |
7f772ed8 EP |
210 | struct device w1_slave_device = { |
211 | .parent = NULL, | |
212 | .bus = &w1_bus_type, | |
40f91de6 | 213 | .init_name = "w1 bus slave", |
7f772ed8 | 214 | .driver = &w1_slave_driver, |
3aca692d | 215 | .release = &w1_slave_release |
7f772ed8 | 216 | }; |
2c5bfdac | 217 | #endif /* 0 */ |
7f772ed8 | 218 | |
060b8845 | 219 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 220 | { |
db2d0008 | 221 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 222 | ssize_t count; |
7785925d | 223 | |
abd52a13 | 224 | mutex_lock(&md->mutex); |
1da177e4 | 225 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 226 | mutex_unlock(&md->mutex); |
1da177e4 LT |
227 | |
228 | return count; | |
229 | } | |
230 | ||
2a9d0c17 EP |
231 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
232 | struct device_attribute *attr, | |
233 | const char * buf, size_t count) | |
234 | { | |
6a158c0d | 235 | long tmp; |
db2d0008 | 236 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 237 | int ret; |
2a9d0c17 | 238 | |
bf4228f0 JH |
239 | ret = kstrtol(buf, 0, &tmp); |
240 | if (ret) | |
241 | return ret; | |
6a158c0d | 242 | |
abd52a13 | 243 | mutex_lock(&md->mutex); |
6a158c0d | 244 | md->search_count = tmp; |
abd52a13 | 245 | mutex_unlock(&md->mutex); |
3c52e4e6 | 246 | wake_up_process(md->thread); |
2a9d0c17 EP |
247 | |
248 | return count; | |
249 | } | |
250 | ||
251 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
252 | struct device_attribute *attr, | |
253 | char *buf) | |
254 | { | |
db2d0008 | 255 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
256 | ssize_t count; |
257 | ||
abd52a13 | 258 | mutex_lock(&md->mutex); |
2a9d0c17 | 259 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 260 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
261 | |
262 | return count; | |
263 | } | |
264 | ||
6a158c0d DF |
265 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
266 | struct device_attribute *attr, | |
267 | const char *buf, size_t count) | |
268 | { | |
269 | long tmp; | |
270 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 271 | int ret; |
6a158c0d | 272 | |
bf4228f0 JH |
273 | ret = kstrtol(buf, 0, &tmp); |
274 | if (ret) | |
275 | return ret; | |
6a158c0d DF |
276 | |
277 | mutex_lock(&md->mutex); | |
278 | md->enable_pullup = tmp; | |
279 | mutex_unlock(&md->mutex); | |
280 | wake_up_process(md->thread); | |
281 | ||
282 | return count; | |
283 | } | |
284 | ||
285 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
286 | struct device_attribute *attr, | |
287 | char *buf) | |
288 | { | |
289 | struct w1_master *md = dev_to_w1_master(dev); | |
290 | ssize_t count; | |
291 | ||
292 | mutex_lock(&md->mutex); | |
293 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
294 | mutex_unlock(&md->mutex); | |
295 | ||
296 | return count; | |
297 | } | |
298 | ||
060b8845 | 299 | static ssize_t w1_master_attribute_show_pointer(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, "0x%p\n", md->bus_master); |
abd52a13 | 306 | mutex_unlock(&md->mutex); |
1da177e4 LT |
307 | return count; |
308 | } | |
309 | ||
060b8845 | 310 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
311 | { |
312 | ssize_t count; | |
313 | count = sprintf(buf, "%d\n", w1_timeout); | |
314 | return count; | |
315 | } | |
316 | ||
060b8845 | 317 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 318 | { |
db2d0008 | 319 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 320 | ssize_t count; |
7785925d | 321 | |
abd52a13 | 322 | mutex_lock(&md->mutex); |
1da177e4 | 323 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 324 | mutex_unlock(&md->mutex); |
1da177e4 LT |
325 | return count; |
326 | } | |
327 | ||
060b8845 | 328 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 329 | { |
db2d0008 | 330 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 331 | ssize_t count; |
7785925d | 332 | |
abd52a13 | 333 | mutex_lock(&md->mutex); |
1da177e4 | 334 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 335 | mutex_unlock(&md->mutex); |
1da177e4 LT |
336 | return count; |
337 | } | |
338 | ||
060b8845 | 339 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 340 | { |
db2d0008 | 341 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 342 | ssize_t count; |
7785925d | 343 | |
abd52a13 | 344 | mutex_lock(&md->mutex); |
1da177e4 | 345 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 346 | mutex_unlock(&md->mutex); |
1da177e4 LT |
347 | return count; |
348 | } | |
349 | ||
9b467411 DF |
350 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
351 | struct device_attribute *attr, char *buf) | |
1da177e4 | 352 | { |
db2d0008 | 353 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
354 | int c = PAGE_SIZE; |
355 | ||
abd52a13 | 356 | mutex_lock(&md->mutex); |
1da177e4 LT |
357 | |
358 | if (md->slave_count == 0) | |
359 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
360 | else { | |
361 | struct list_head *ent, *n; | |
362 | struct w1_slave *sl; | |
363 | ||
364 | list_for_each_safe(ent, n, &md->slist) { | |
365 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
366 | ||
7785925d | 367 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
368 | } |
369 | } | |
370 | ||
abd52a13 | 371 | mutex_unlock(&md->mutex); |
1da177e4 LT |
372 | |
373 | return PAGE_SIZE - c; | |
374 | } | |
375 | ||
9b467411 DF |
376 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
379 | int c = PAGE_SIZE; | |
380 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
381 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
382 | return PAGE_SIZE - c; | |
383 | } | |
384 | ||
385 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
386 | struct w1_reg_num *rn) | |
387 | { | |
388 | unsigned int family; | |
389 | unsigned long long id; | |
390 | int i; | |
391 | u64 rn64_le; | |
392 | ||
393 | /* The CRC value isn't read from the user because the sysfs directory | |
394 | * doesn't include it and most messages from the bus search don't | |
395 | * print it either. It would be unreasonable for the user to then | |
396 | * provide it. | |
397 | */ | |
398 | const char *error_msg = "bad slave string format, expecting " | |
399 | "ff-dddddddddddd\n"; | |
400 | ||
401 | if (buf[2] != '-') { | |
402 | dev_err(dev, "%s", error_msg); | |
403 | return -EINVAL; | |
404 | } | |
405 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
406 | if (i != 2) { | |
407 | dev_err(dev, "%s", error_msg); | |
408 | return -EINVAL; | |
409 | } | |
410 | rn->family = family; | |
411 | rn->id = id; | |
412 | ||
413 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
414 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
415 | ||
416 | #if 0 | |
417 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
418 | rn->family, (unsigned long long)rn->id, rn->crc); | |
419 | #endif | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
425 | * Note: must hold the mutex | |
426 | */ | |
427 | static struct w1_slave *w1_slave_search_device(struct w1_master *dev, | |
428 | struct w1_reg_num *rn) | |
429 | { | |
430 | struct w1_slave *sl; | |
431 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { | |
432 | if (sl->reg_num.family == rn->family && | |
433 | sl->reg_num.id == rn->id && | |
434 | sl->reg_num.crc == rn->crc) { | |
435 | return sl; | |
436 | } | |
437 | } | |
438 | return NULL; | |
439 | } | |
440 | ||
441 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
442 | struct device_attribute *attr, | |
443 | const char *buf, size_t count) | |
444 | { | |
445 | struct w1_master *md = dev_to_w1_master(dev); | |
446 | struct w1_reg_num rn; | |
447 | struct w1_slave *sl; | |
448 | ssize_t result = count; | |
449 | ||
450 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
451 | return -EINVAL; | |
452 | ||
453 | mutex_lock(&md->mutex); | |
454 | sl = w1_slave_search_device(md, &rn); | |
455 | /* It would be nice to do a targeted search one the one-wire bus | |
456 | * for the new device to see if it is out there or not. But the | |
457 | * current search doesn't support that. | |
458 | */ | |
459 | if (sl) { | |
460 | dev_info(dev, "Device %s already exists\n", sl->name); | |
461 | result = -EINVAL; | |
462 | } else { | |
463 | w1_attach_slave_device(md, &rn); | |
464 | } | |
465 | mutex_unlock(&md->mutex); | |
466 | ||
467 | return result; | |
468 | } | |
469 | ||
470 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
471 | struct device_attribute *attr, char *buf) | |
472 | { | |
473 | int c = PAGE_SIZE; | |
474 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
475 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
476 | return PAGE_SIZE - c; | |
477 | } | |
478 | ||
479 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
480 | struct device_attribute *attr, | |
481 | const char *buf, size_t count) | |
482 | { | |
483 | struct w1_master *md = dev_to_w1_master(dev); | |
484 | struct w1_reg_num rn; | |
485 | struct w1_slave *sl; | |
486 | ssize_t result = count; | |
487 | ||
488 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
489 | return -EINVAL; | |
490 | ||
491 | mutex_lock(&md->mutex); | |
492 | sl = w1_slave_search_device(md, &rn); | |
493 | if (sl) { | |
494 | w1_slave_detach(sl); | |
495 | } else { | |
496 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
497 | (unsigned long long)rn.id); | |
498 | result = -EINVAL; | |
499 | } | |
500 | mutex_unlock(&md->mutex); | |
501 | ||
502 | return result; | |
503 | } | |
504 | ||
7785925d EP |
505 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
506 | struct device_attribute w1_master_attribute_##_name = \ | |
507 | __ATTR(w1_master_##_name, _mode, \ | |
508 | w1_master_attribute_show_##_name, NULL) | |
509 | ||
2a9d0c17 EP |
510 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
511 | struct device_attribute w1_master_attribute_##_name = \ | |
512 | __ATTR(w1_master_##_name, _mode, \ | |
513 | w1_master_attribute_show_##_name, \ | |
514 | w1_master_attribute_store_##_name) | |
515 | ||
7785925d EP |
516 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
517 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
518 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
519 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
520 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
521 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
522 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
12aa4c64 BS |
523 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
524 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
525 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
526 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
527 | |
528 | static struct attribute *w1_master_default_attrs[] = { | |
529 | &w1_master_attribute_name.attr, | |
530 | &w1_master_attribute_slaves.attr, | |
531 | &w1_master_attribute_slave_count.attr, | |
532 | &w1_master_attribute_max_slave_count.attr, | |
533 | &w1_master_attribute_attempts.attr, | |
534 | &w1_master_attribute_timeout.attr, | |
535 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 536 | &w1_master_attribute_search.attr, |
6a158c0d | 537 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
538 | &w1_master_attribute_add.attr, |
539 | &w1_master_attribute_remove.attr, | |
7785925d | 540 | NULL |
1da177e4 LT |
541 | }; |
542 | ||
7785925d EP |
543 | static struct attribute_group w1_master_defattr_group = { |
544 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
545 | }; |
546 | ||
7785925d EP |
547 | int w1_create_master_attributes(struct w1_master *master) |
548 | { | |
549 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
550 | } | |
551 | ||
c30c9b15 | 552 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
553 | { |
554 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
555 | } | |
556 | ||
7eff2e7a | 557 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
558 | { |
559 | struct w1_master *md = NULL; | |
560 | struct w1_slave *sl = NULL; | |
561 | char *event_owner, *name; | |
526be416 | 562 | int err = 0; |
7f772ed8 EP |
563 | |
564 | if (dev->driver == &w1_master_driver) { | |
565 | md = container_of(dev, struct w1_master, dev); | |
566 | event_owner = "master"; | |
567 | name = md->name; | |
568 | } else if (dev->driver == &w1_slave_driver) { | |
569 | sl = container_of(dev, struct w1_slave, dev); | |
570 | event_owner = "slave"; | |
571 | name = sl->name; | |
572 | } else { | |
312c004d | 573 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
574 | return -EINVAL; |
575 | } | |
576 | ||
c6976a4e | 577 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 578 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
579 | |
580 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 581 | goto end; |
7f772ed8 | 582 | |
7eff2e7a | 583 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 584 | if (err) |
526be416 | 585 | goto end; |
7f772ed8 | 586 | |
7eff2e7a KS |
587 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
588 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
589 | end: |
590 | return err; | |
591 | } | |
7f772ed8 | 592 | |
47eba33a GKH |
593 | /* |
594 | * Handle sysfs file creation and removal here, before userspace is told that | |
595 | * the device is added / removed from the system | |
596 | */ | |
597 | static int w1_bus_notify(struct notifier_block *nb, unsigned long action, | |
598 | void *data) | |
599 | { | |
600 | struct device *dev = data; | |
601 | struct w1_slave *sl; | |
36c27a65 | 602 | struct w1_family_ops *fops; |
47eba33a GKH |
603 | int err; |
604 | ||
605 | /* | |
606 | * Only care about slave devices at the moment. Yes, we should use a | |
607 | * separate "type" for this, but for now, look at the release function | |
608 | * to know which type it is... | |
609 | */ | |
610 | if (dev->release != w1_slave_release) | |
611 | return 0; | |
612 | ||
613 | sl = dev_to_w1_slave(dev); | |
36c27a65 | 614 | fops = sl->family->fops; |
47eba33a | 615 | |
2962aece HFV |
616 | if (!fops) |
617 | return 0; | |
618 | ||
47eba33a GKH |
619 | switch (action) { |
620 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 621 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
622 | if (fops->add_slave) { |
623 | err = fops->add_slave(sl); | |
624 | if (err < 0) { | |
625 | dev_err(&sl->dev, | |
626 | "add_slave() call failed. err=%d\n", | |
627 | err); | |
628 | return err; | |
629 | } | |
630 | } | |
631 | if (fops->groups) { | |
632 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
633 | if (err) { | |
634 | dev_err(&sl->dev, | |
635 | "sysfs group creation failed. err=%d\n", | |
636 | err); | |
637 | return err; | |
638 | } | |
47eba33a GKH |
639 | } |
640 | ||
641 | break; | |
642 | case BUS_NOTIFY_DEL_DEVICE: | |
36c27a65 | 643 | if (fops->remove_slave) |
47eba33a | 644 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
645 | if (fops->groups) |
646 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
647 | break; |
648 | } | |
649 | return 0; | |
650 | } | |
651 | ||
652 | static struct notifier_block w1_bus_nb = { | |
653 | .notifier_call = w1_bus_notify, | |
654 | }; | |
655 | ||
1da177e4 LT |
656 | static int __w1_attach_slave_device(struct w1_slave *sl) |
657 | { | |
658 | int err; | |
659 | ||
660 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 661 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
662 | sl->dev.bus = &w1_bus_type; |
663 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 664 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 665 | |
40f91de6 | 666 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
667 | (unsigned int) sl->reg_num.family, |
668 | (unsigned long long) sl->reg_num.id); | |
669 | snprintf(&sl->name[0], sizeof(sl->name), | |
670 | "%02x-%012llx", | |
671 | (unsigned int) sl->reg_num.family, | |
672 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 673 | |
c6976a4e | 674 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 675 | dev_name(&sl->dev), sl); |
1da177e4 LT |
676 | |
677 | err = device_register(&sl->dev); | |
678 | if (err < 0) { | |
679 | dev_err(&sl->dev, | |
6b729861 | 680 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 681 | dev_name(&sl->dev), err); |
1da177e4 LT |
682 | return err; |
683 | } | |
684 | ||
1da177e4 | 685 | |
47eba33a GKH |
686 | dev_set_uevent_suppress(&sl->dev, false); |
687 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
688 | |
689 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
695 | { | |
696 | struct w1_slave *sl; | |
697 | struct w1_family *f; | |
698 | int err; | |
699 | struct w1_netlink_msg msg; | |
700 | ||
dd00cc48 | 701 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
702 | if (!sl) { |
703 | dev_err(&dev->dev, | |
704 | "%s: failed to allocate new slave device.\n", | |
705 | __func__); | |
706 | return -ENOMEM; | |
707 | } | |
708 | ||
1da177e4 LT |
709 | |
710 | sl->owner = THIS_MODULE; | |
711 | sl->master = dev; | |
712 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
713 | ||
12003375 | 714 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
715 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
716 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 717 | init_completion(&sl->released); |
1da177e4 | 718 | |
bc04d76d HFV |
719 | /* slave modules need to be loaded in a context with unlocked mutex */ |
720 | mutex_unlock(&dev->mutex); | |
8d7bda51 | 721 | request_module("w1-family-0x%0x", rn->family); |
bc04d76d | 722 | mutex_lock(&dev->mutex); |
8d7bda51 | 723 | |
1da177e4 LT |
724 | spin_lock(&w1_flock); |
725 | f = w1_family_registered(rn->family); | |
726 | if (!f) { | |
99c5bfe9 | 727 | f= &w1_default_family; |
1da177e4 LT |
728 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
729 | rn->family, rn->family, | |
730 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
731 | } |
732 | __w1_family_get(f); | |
733 | spin_unlock(&w1_flock); | |
734 | ||
735 | sl->family = f; | |
736 | ||
737 | ||
738 | err = __w1_attach_slave_device(sl); | |
739 | if (err < 0) { | |
740 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
741 | sl->name); | |
742 | w1_family_put(sl->family); | |
743 | kfree(sl); | |
744 | return err; | |
745 | } | |
746 | ||
747 | sl->ttl = dev->slave_ttl; | |
748 | dev->slave_count++; | |
749 | ||
12003375 | 750 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
751 | msg.type = W1_SLAVE_ADD; |
752 | w1_netlink_send(dev, &msg); | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
c30c9b15 | 757 | void w1_slave_detach(struct w1_slave *sl) |
1da177e4 LT |
758 | { |
759 | struct w1_netlink_msg msg; | |
7785925d | 760 | |
7c8f5703 | 761 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 762 | |
3aca692d | 763 | list_del(&sl->w1_slave_entry); |
1da177e4 | 764 | |
12003375 EP |
765 | memset(&msg, 0, sizeof(msg)); |
766 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
767 | msg.type = W1_SLAVE_REMOVE; |
768 | w1_netlink_send(sl->master, &msg); | |
769 | ||
1da177e4 | 770 | device_unregister(&sl->dev); |
1da177e4 | 771 | |
3aca692d EP |
772 | wait_for_completion(&sl->released); |
773 | kfree(sl); | |
1da177e4 LT |
774 | } |
775 | ||
12003375 EP |
776 | struct w1_master *w1_search_master_id(u32 id) |
777 | { | |
778 | struct w1_master *dev; | |
779 | int found = 0; | |
780 | ||
abd52a13 | 781 | mutex_lock(&w1_mlock); |
12003375 EP |
782 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
783 | if (dev->id == id) { | |
784 | found = 1; | |
785 | atomic_inc(&dev->refcnt); | |
786 | break; | |
787 | } | |
788 | } | |
abd52a13 | 789 | mutex_unlock(&w1_mlock); |
12003375 EP |
790 | |
791 | return (found)?dev:NULL; | |
792 | } | |
793 | ||
794 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
795 | { | |
796 | struct w1_master *dev; | |
797 | struct w1_slave *sl = NULL; | |
798 | int found = 0; | |
799 | ||
abd52a13 | 800 | mutex_lock(&w1_mlock); |
12003375 | 801 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 802 | mutex_lock(&dev->mutex); |
12003375 EP |
803 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
804 | if (sl->reg_num.family == id->family && | |
805 | sl->reg_num.id == id->id && | |
806 | sl->reg_num.crc == id->crc) { | |
807 | found = 1; | |
808 | atomic_inc(&dev->refcnt); | |
809 | atomic_inc(&sl->refcnt); | |
810 | break; | |
811 | } | |
812 | } | |
abd52a13 | 813 | mutex_unlock(&dev->mutex); |
12003375 EP |
814 | |
815 | if (found) | |
816 | break; | |
817 | } | |
abd52a13 | 818 | mutex_unlock(&w1_mlock); |
12003375 EP |
819 | |
820 | return (found)?sl:NULL; | |
821 | } | |
822 | ||
c30c9b15 | 823 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 824 | { |
c30c9b15 | 825 | struct w1_slave *sl, *sln; |
6adf87bd EP |
826 | struct w1_master *dev; |
827 | ||
abd52a13 | 828 | mutex_lock(&w1_mlock); |
6adf87bd | 829 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
830 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
831 | "for family %02x.\n", dev->name, f->fid); | |
832 | mutex_lock(&dev->mutex); | |
833 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
834 | /* If it is a new family, slaves with the default | |
835 | * family driver and are that family will be | |
836 | * connected. If the family is going away, devices | |
837 | * matching that family are reconneced. | |
838 | */ | |
839 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
840 | && sl->reg_num.family == f->fid) || | |
841 | (!attach && sl->family->fid == f->fid)) { | |
842 | struct w1_reg_num rn; | |
843 | ||
844 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
845 | w1_slave_detach(sl); | |
846 | ||
847 | w1_attach_slave_device(dev, &rn); | |
848 | } | |
849 | } | |
850 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
851 | "has been finished.\n", dev->name); | |
852 | mutex_unlock(&dev->mutex); | |
6adf87bd | 853 | } |
abd52a13 | 854 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
855 | } |
856 | ||
963bb101 | 857 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 858 | { |
1da177e4 | 859 | struct w1_slave *sl; |
1da177e4 | 860 | struct w1_reg_num *tmp; |
0e65f828 | 861 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 862 | |
c30c9b15 | 863 | atomic_inc(&dev->refcnt); |
7785925d | 864 | |
1da177e4 LT |
865 | tmp = (struct w1_reg_num *) &rn; |
866 | ||
cd7b28d3 DF |
867 | sl = w1_slave_search_device(dev, tmp); |
868 | if (sl) { | |
869 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
870 | } else { | |
871 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
872 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 873 | } |
7785925d | 874 | |
1da177e4 LT |
875 | atomic_dec(&dev->refcnt); |
876 | } | |
877 | ||
6b729861 EP |
878 | /** |
879 | * Performs a ROM Search & registers any devices found. | |
880 | * The 1-wire search is a simple binary tree search. | |
881 | * For each bit of the address, we read two bits and write one bit. | |
882 | * The bit written will put to sleep all devies that don't match that bit. | |
883 | * When the two reads differ, the direction choice is obvious. | |
884 | * When both bits are 0, we must choose a path to take. | |
885 | * When we can scan all 64 bits without having to choose a path, we are done. | |
886 | * | |
887 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
888 | * | |
889 | * @dev The master device to search | |
890 | * @cb Function to call when a device is found | |
891 | */ | |
12003375 | 892 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 893 | { |
6b729861 EP |
894 | u64 last_rn, rn, tmp64; |
895 | int i, slave_count = 0; | |
896 | int last_zero, last_device; | |
897 | int search_bit, desc_bit; | |
898 | u8 triplet_ret = 0; | |
1da177e4 | 899 | |
6b729861 EP |
900 | search_bit = 0; |
901 | rn = last_rn = 0; | |
902 | last_device = 0; | |
903 | last_zero = -1; | |
1da177e4 LT |
904 | |
905 | desc_bit = 64; | |
906 | ||
6b729861 EP |
907 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
908 | last_rn = rn; | |
1da177e4 LT |
909 | rn = 0; |
910 | ||
1da177e4 LT |
911 | /* |
912 | * Reset bus and all 1-wire device state machines | |
913 | * so they can respond to our requests. | |
914 | * | |
915 | * Return 0 - device(s) present, 1 - no devices present. | |
916 | */ | |
b02f8bed | 917 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 918 | if (w1_reset_bus(dev)) { |
b02f8bed | 919 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 920 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
921 | break; |
922 | } | |
923 | ||
c9cbf558 EP |
924 | /* Do fast search on single slave bus */ |
925 | if (dev->max_slave_count == 1) { | |
b02f8bed | 926 | int rv; |
c9cbf558 | 927 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
928 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
929 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 930 | |
b02f8bed | 931 | if (rv == 8 && rn) |
c9cbf558 EP |
932 | cb(dev, rn); |
933 | ||
934 | break; | |
935 | } | |
936 | ||
6b729861 | 937 | /* Start the search */ |
12003375 | 938 | w1_write_8(dev, search_type); |
1da177e4 | 939 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
940 | /* Determine the direction/search bit */ |
941 | if (i == desc_bit) | |
942 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
943 | else if (i > desc_bit) | |
944 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 945 | else |
6b729861 | 946 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 947 | |
6b729861 EP |
948 | /** Read two bits and write one bit */ |
949 | triplet_ret = w1_triplet(dev, search_bit); | |
950 | ||
951 | /* quit if no device responded */ | |
952 | if ( (triplet_ret & 0x03) == 0x03 ) | |
953 | break; | |
1da177e4 | 954 | |
6b729861 EP |
955 | /* If both directions were valid, and we took the 0 path... */ |
956 | if (triplet_ret == 0) | |
957 | last_zero = i; | |
1da177e4 | 958 | |
6b729861 EP |
959 | /* extract the direction taken & update the device number */ |
960 | tmp64 = (triplet_ret >> 2); | |
961 | rn |= (tmp64 << i); | |
0d671b27 | 962 | |
9d1817ca MJ |
963 | /* ensure we're called from kthread and not by netlink callback */ |
964 | if (!dev->priv && kthread_should_stop()) { | |
b02f8bed | 965 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 966 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
967 | return; |
968 | } | |
6b729861 | 969 | } |
b02f8bed | 970 | mutex_unlock(&dev->bus_mutex); |
7785925d | 971 | |
6b729861 EP |
972 | if ( (triplet_ret & 0x03) != 0x03 ) { |
973 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
974 | last_device = 1; | |
975 | desc_bit = last_zero; | |
c30c9b15 | 976 | cb(dev, rn); |
6b729861 | 977 | } |
1da177e4 LT |
978 | } |
979 | } | |
980 | ||
963bb101 DF |
981 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
982 | w1_slave_found_callback cb) | |
12003375 EP |
983 | { |
984 | struct w1_slave *sl, *sln; | |
985 | ||
986 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
987 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
988 | ||
963bb101 | 989 | w1_search_devices(dev, search_type, cb); |
12003375 EP |
990 | |
991 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
a2a6c74d | 992 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) |
12003375 | 993 | w1_slave_detach(sl); |
a2a6c74d | 994 | else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
12003375 EP |
995 | sl->ttl = dev->slave_ttl; |
996 | } | |
997 | ||
998 | if (dev->search_count > 0) | |
999 | dev->search_count--; | |
1000 | } | |
1001 | ||
963bb101 DF |
1002 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1003 | { | |
1004 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1005 | } | |
1006 | ||
1da177e4 LT |
1007 | int w1_process(void *data) |
1008 | { | |
1009 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1010 | /* As long as w1_timeout is only set by a module parameter the sleep |
1011 | * time can be calculated in jiffies once. | |
1012 | */ | |
1013 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); | |
1da177e4 | 1014 | |
3c52e4e6 | 1015 | while (!kthread_should_stop()) { |
01e14d6d DF |
1016 | if (dev->search_count) { |
1017 | mutex_lock(&dev->mutex); | |
1018 | w1_search_process(dev, W1_SEARCH); | |
1019 | mutex_unlock(&dev->mutex); | |
1020 | } | |
1021 | ||
3e1d1d28 | 1022 | try_to_freeze(); |
3c52e4e6 DF |
1023 | __set_current_state(TASK_INTERRUPTIBLE); |
1024 | ||
1025 | if (kthread_should_stop()) | |
1026 | break; | |
1027 | ||
1028 | /* Only sleep when the search is active. */ | |
1029 | if (dev->search_count) | |
1030 | schedule_timeout(jtime); | |
1031 | else | |
1032 | schedule(); | |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1036 | |
1037 | return 0; | |
1038 | } | |
1039 | ||
73a98fce | 1040 | static int __init w1_init(void) |
1da177e4 LT |
1041 | { |
1042 | int retval; | |
1043 | ||
1044 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
1045 | ||
12003375 EP |
1046 | w1_init_netlink(); |
1047 | ||
1da177e4 LT |
1048 | retval = bus_register(&w1_bus_type); |
1049 | if (retval) { | |
1050 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
1051 | goto err_out_exit_init; | |
1052 | } | |
1053 | ||
47eba33a GKH |
1054 | retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb); |
1055 | if (retval) | |
1056 | goto err_out_bus_unregister; | |
1057 | ||
7f772ed8 | 1058 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
1059 | if (retval) { |
1060 | printk(KERN_ERR | |
1061 | "Failed to register master driver. err=%d.\n", | |
1062 | retval); | |
1063 | goto err_out_bus_unregister; | |
1064 | } | |
1065 | ||
7f772ed8 EP |
1066 | retval = driver_register(&w1_slave_driver); |
1067 | if (retval) { | |
1068 | printk(KERN_ERR | |
ecf19489 | 1069 | "Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1070 | retval); |
1071 | goto err_out_master_unregister; | |
1072 | } | |
1073 | ||
1da177e4 LT |
1074 | return 0; |
1075 | ||
c30c9b15 DF |
1076 | #if 0 |
1077 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1078 | err_out_slave_unregister: |
1079 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1080 | #endif |
7f772ed8 EP |
1081 | |
1082 | err_out_master_unregister: | |
1083 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1084 | |
1085 | err_out_bus_unregister: | |
1086 | bus_unregister(&w1_bus_type); | |
1087 | ||
1088 | err_out_exit_init: | |
1089 | return retval; | |
1090 | } | |
1091 | ||
73a98fce | 1092 | static void __exit w1_fini(void) |
1da177e4 LT |
1093 | { |
1094 | struct w1_master *dev; | |
1da177e4 | 1095 | |
c30c9b15 | 1096 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1097 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1098 | __w1_remove_master_device(dev); |
1da177e4 | 1099 | |
12003375 EP |
1100 | w1_fini_netlink(); |
1101 | ||
7f772ed8 EP |
1102 | driver_unregister(&w1_slave_driver); |
1103 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1104 | bus_unregister(&w1_bus_type); |
1105 | } | |
1106 | ||
1107 | module_init(w1_init); | |
1108 | module_exit(w1_fini); |