]>
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; | |
a1613056 | 49 | int w1_max_slave_count = 64; |
1da177e4 LT |
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); |
af8c7237 DF |
246 | /* Only wake if it is going to be searching. */ |
247 | if (tmp) | |
248 | wake_up_process(md->thread); | |
2a9d0c17 EP |
249 | |
250 | return count; | |
251 | } | |
252 | ||
253 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
254 | struct device_attribute *attr, | |
255 | char *buf) | |
256 | { | |
db2d0008 | 257 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
258 | ssize_t count; |
259 | ||
abd52a13 | 260 | mutex_lock(&md->mutex); |
2a9d0c17 | 261 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 262 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
263 | |
264 | return count; | |
265 | } | |
266 | ||
6a158c0d DF |
267 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
268 | struct device_attribute *attr, | |
269 | const char *buf, size_t count) | |
270 | { | |
271 | long tmp; | |
272 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 273 | int ret; |
6a158c0d | 274 | |
bf4228f0 JH |
275 | ret = kstrtol(buf, 0, &tmp); |
276 | if (ret) | |
277 | return ret; | |
6a158c0d DF |
278 | |
279 | mutex_lock(&md->mutex); | |
280 | md->enable_pullup = tmp; | |
281 | mutex_unlock(&md->mutex); | |
282 | wake_up_process(md->thread); | |
283 | ||
284 | return count; | |
285 | } | |
286 | ||
287 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
288 | struct device_attribute *attr, | |
289 | char *buf) | |
290 | { | |
291 | struct w1_master *md = dev_to_w1_master(dev); | |
292 | ssize_t count; | |
293 | ||
294 | mutex_lock(&md->mutex); | |
295 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
296 | mutex_unlock(&md->mutex); | |
297 | ||
298 | return count; | |
299 | } | |
300 | ||
060b8845 | 301 | static ssize_t w1_master_attribute_show_pointer(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, "0x%p\n", md->bus_master); |
abd52a13 | 308 | mutex_unlock(&md->mutex); |
1da177e4 LT |
309 | return count; |
310 | } | |
311 | ||
060b8845 | 312 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
313 | { |
314 | ssize_t count; | |
315 | count = sprintf(buf, "%d\n", w1_timeout); | |
316 | return count; | |
317 | } | |
318 | ||
a1613056 DF |
319 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
320 | struct device_attribute *attr, const char *buf, size_t count) | |
321 | { | |
322 | long tmp; | |
323 | struct w1_master *md = dev_to_w1_master(dev); | |
324 | ||
325 | if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1) | |
326 | return -EINVAL; | |
327 | ||
328 | mutex_lock(&md->mutex); | |
329 | md->max_slave_count = tmp; | |
330 | /* allow each time the max_slave_count is updated */ | |
331 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
332 | mutex_unlock(&md->mutex); | |
333 | ||
334 | return count; | |
335 | } | |
336 | ||
060b8845 | 337 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 338 | { |
db2d0008 | 339 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 340 | ssize_t count; |
7785925d | 341 | |
abd52a13 | 342 | mutex_lock(&md->mutex); |
1da177e4 | 343 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 344 | mutex_unlock(&md->mutex); |
1da177e4 LT |
345 | return count; |
346 | } | |
347 | ||
060b8845 | 348 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 349 | { |
db2d0008 | 350 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 351 | ssize_t count; |
7785925d | 352 | |
abd52a13 | 353 | mutex_lock(&md->mutex); |
1da177e4 | 354 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 355 | mutex_unlock(&md->mutex); |
1da177e4 LT |
356 | return count; |
357 | } | |
358 | ||
060b8845 | 359 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 360 | { |
db2d0008 | 361 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 362 | ssize_t count; |
7785925d | 363 | |
abd52a13 | 364 | mutex_lock(&md->mutex); |
1da177e4 | 365 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 366 | mutex_unlock(&md->mutex); |
1da177e4 LT |
367 | return count; |
368 | } | |
369 | ||
9b467411 DF |
370 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
371 | struct device_attribute *attr, char *buf) | |
1da177e4 | 372 | { |
db2d0008 | 373 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
374 | int c = PAGE_SIZE; |
375 | ||
abd52a13 | 376 | mutex_lock(&md->mutex); |
1da177e4 LT |
377 | |
378 | if (md->slave_count == 0) | |
379 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
380 | else { | |
381 | struct list_head *ent, *n; | |
382 | struct w1_slave *sl; | |
383 | ||
384 | list_for_each_safe(ent, n, &md->slist) { | |
385 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
386 | ||
7785925d | 387 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
388 | } |
389 | } | |
390 | ||
abd52a13 | 391 | mutex_unlock(&md->mutex); |
1da177e4 LT |
392 | |
393 | return PAGE_SIZE - c; | |
394 | } | |
395 | ||
9b467411 DF |
396 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
397 | struct device_attribute *attr, char *buf) | |
398 | { | |
399 | int c = PAGE_SIZE; | |
400 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
401 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
402 | return PAGE_SIZE - c; | |
403 | } | |
404 | ||
405 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
406 | struct w1_reg_num *rn) | |
407 | { | |
408 | unsigned int family; | |
409 | unsigned long long id; | |
410 | int i; | |
411 | u64 rn64_le; | |
412 | ||
413 | /* The CRC value isn't read from the user because the sysfs directory | |
414 | * doesn't include it and most messages from the bus search don't | |
415 | * print it either. It would be unreasonable for the user to then | |
416 | * provide it. | |
417 | */ | |
418 | const char *error_msg = "bad slave string format, expecting " | |
419 | "ff-dddddddddddd\n"; | |
420 | ||
421 | if (buf[2] != '-') { | |
422 | dev_err(dev, "%s", error_msg); | |
423 | return -EINVAL; | |
424 | } | |
425 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
426 | if (i != 2) { | |
427 | dev_err(dev, "%s", error_msg); | |
428 | return -EINVAL; | |
429 | } | |
430 | rn->family = family; | |
431 | rn->id = id; | |
432 | ||
433 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
434 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
435 | ||
436 | #if 0 | |
437 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
438 | rn->family, (unsigned long long)rn->id, rn->crc); | |
439 | #endif | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
445 | * Note: must hold the mutex | |
446 | */ | |
447 | static struct w1_slave *w1_slave_search_device(struct w1_master *dev, | |
448 | struct w1_reg_num *rn) | |
449 | { | |
450 | struct w1_slave *sl; | |
451 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { | |
452 | if (sl->reg_num.family == rn->family && | |
453 | sl->reg_num.id == rn->id && | |
454 | sl->reg_num.crc == rn->crc) { | |
455 | return sl; | |
456 | } | |
457 | } | |
458 | return NULL; | |
459 | } | |
460 | ||
461 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
462 | struct device_attribute *attr, | |
463 | const char *buf, size_t count) | |
464 | { | |
465 | struct w1_master *md = dev_to_w1_master(dev); | |
466 | struct w1_reg_num rn; | |
467 | struct w1_slave *sl; | |
468 | ssize_t result = count; | |
469 | ||
470 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
471 | return -EINVAL; | |
472 | ||
473 | mutex_lock(&md->mutex); | |
474 | sl = w1_slave_search_device(md, &rn); | |
475 | /* It would be nice to do a targeted search one the one-wire bus | |
476 | * for the new device to see if it is out there or not. But the | |
477 | * current search doesn't support that. | |
478 | */ | |
479 | if (sl) { | |
480 | dev_info(dev, "Device %s already exists\n", sl->name); | |
481 | result = -EINVAL; | |
482 | } else { | |
483 | w1_attach_slave_device(md, &rn); | |
484 | } | |
485 | mutex_unlock(&md->mutex); | |
486 | ||
487 | return result; | |
488 | } | |
489 | ||
490 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
491 | struct device_attribute *attr, char *buf) | |
492 | { | |
493 | int c = PAGE_SIZE; | |
494 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
495 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
496 | return PAGE_SIZE - c; | |
497 | } | |
498 | ||
499 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
500 | struct device_attribute *attr, | |
501 | const char *buf, size_t count) | |
502 | { | |
503 | struct w1_master *md = dev_to_w1_master(dev); | |
504 | struct w1_reg_num rn; | |
505 | struct w1_slave *sl; | |
506 | ssize_t result = count; | |
507 | ||
508 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
509 | return -EINVAL; | |
510 | ||
511 | mutex_lock(&md->mutex); | |
512 | sl = w1_slave_search_device(md, &rn); | |
513 | if (sl) { | |
514 | w1_slave_detach(sl); | |
515 | } else { | |
516 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
517 | (unsigned long long)rn.id); | |
518 | result = -EINVAL; | |
519 | } | |
520 | mutex_unlock(&md->mutex); | |
521 | ||
522 | return result; | |
523 | } | |
524 | ||
7785925d EP |
525 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
526 | struct device_attribute w1_master_attribute_##_name = \ | |
527 | __ATTR(w1_master_##_name, _mode, \ | |
528 | w1_master_attribute_show_##_name, NULL) | |
529 | ||
2a9d0c17 EP |
530 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
531 | struct device_attribute w1_master_attribute_##_name = \ | |
532 | __ATTR(w1_master_##_name, _mode, \ | |
533 | w1_master_attribute_show_##_name, \ | |
534 | w1_master_attribute_store_##_name) | |
535 | ||
7785925d EP |
536 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
537 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
538 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 539 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
540 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
541 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
542 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
12aa4c64 BS |
543 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
544 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
545 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
546 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
547 | |
548 | static struct attribute *w1_master_default_attrs[] = { | |
549 | &w1_master_attribute_name.attr, | |
550 | &w1_master_attribute_slaves.attr, | |
551 | &w1_master_attribute_slave_count.attr, | |
552 | &w1_master_attribute_max_slave_count.attr, | |
553 | &w1_master_attribute_attempts.attr, | |
554 | &w1_master_attribute_timeout.attr, | |
555 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 556 | &w1_master_attribute_search.attr, |
6a158c0d | 557 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
558 | &w1_master_attribute_add.attr, |
559 | &w1_master_attribute_remove.attr, | |
7785925d | 560 | NULL |
1da177e4 LT |
561 | }; |
562 | ||
7785925d EP |
563 | static struct attribute_group w1_master_defattr_group = { |
564 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
565 | }; |
566 | ||
7785925d EP |
567 | int w1_create_master_attributes(struct w1_master *master) |
568 | { | |
569 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
570 | } | |
571 | ||
c30c9b15 | 572 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
573 | { |
574 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
575 | } | |
576 | ||
7eff2e7a | 577 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
578 | { |
579 | struct w1_master *md = NULL; | |
580 | struct w1_slave *sl = NULL; | |
581 | char *event_owner, *name; | |
526be416 | 582 | int err = 0; |
7f772ed8 EP |
583 | |
584 | if (dev->driver == &w1_master_driver) { | |
585 | md = container_of(dev, struct w1_master, dev); | |
586 | event_owner = "master"; | |
587 | name = md->name; | |
588 | } else if (dev->driver == &w1_slave_driver) { | |
589 | sl = container_of(dev, struct w1_slave, dev); | |
590 | event_owner = "slave"; | |
591 | name = sl->name; | |
592 | } else { | |
312c004d | 593 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
594 | return -EINVAL; |
595 | } | |
596 | ||
c6976a4e | 597 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 598 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
599 | |
600 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 601 | goto end; |
7f772ed8 | 602 | |
7eff2e7a | 603 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 604 | if (err) |
526be416 | 605 | goto end; |
7f772ed8 | 606 | |
7eff2e7a KS |
607 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
608 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
609 | end: |
610 | return err; | |
611 | } | |
7f772ed8 | 612 | |
47eba33a GKH |
613 | /* |
614 | * Handle sysfs file creation and removal here, before userspace is told that | |
615 | * the device is added / removed from the system | |
616 | */ | |
617 | static int w1_bus_notify(struct notifier_block *nb, unsigned long action, | |
618 | void *data) | |
619 | { | |
620 | struct device *dev = data; | |
621 | struct w1_slave *sl; | |
36c27a65 | 622 | struct w1_family_ops *fops; |
47eba33a GKH |
623 | int err; |
624 | ||
625 | /* | |
626 | * Only care about slave devices at the moment. Yes, we should use a | |
627 | * separate "type" for this, but for now, look at the release function | |
628 | * to know which type it is... | |
629 | */ | |
630 | if (dev->release != w1_slave_release) | |
631 | return 0; | |
632 | ||
633 | sl = dev_to_w1_slave(dev); | |
36c27a65 | 634 | fops = sl->family->fops; |
47eba33a | 635 | |
2962aece HFV |
636 | if (!fops) |
637 | return 0; | |
638 | ||
47eba33a GKH |
639 | switch (action) { |
640 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 641 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
642 | if (fops->add_slave) { |
643 | err = fops->add_slave(sl); | |
644 | if (err < 0) { | |
645 | dev_err(&sl->dev, | |
646 | "add_slave() call failed. err=%d\n", | |
647 | err); | |
648 | return err; | |
649 | } | |
650 | } | |
651 | if (fops->groups) { | |
652 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
653 | if (err) { | |
654 | dev_err(&sl->dev, | |
655 | "sysfs group creation failed. err=%d\n", | |
656 | err); | |
657 | return err; | |
658 | } | |
47eba33a GKH |
659 | } |
660 | ||
661 | break; | |
662 | case BUS_NOTIFY_DEL_DEVICE: | |
36c27a65 | 663 | if (fops->remove_slave) |
47eba33a | 664 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
665 | if (fops->groups) |
666 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
667 | break; |
668 | } | |
669 | return 0; | |
670 | } | |
671 | ||
672 | static struct notifier_block w1_bus_nb = { | |
673 | .notifier_call = w1_bus_notify, | |
674 | }; | |
675 | ||
1da177e4 LT |
676 | static int __w1_attach_slave_device(struct w1_slave *sl) |
677 | { | |
678 | int err; | |
679 | ||
680 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 681 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
682 | sl->dev.bus = &w1_bus_type; |
683 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 684 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 685 | |
40f91de6 | 686 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
687 | (unsigned int) sl->reg_num.family, |
688 | (unsigned long long) sl->reg_num.id); | |
689 | snprintf(&sl->name[0], sizeof(sl->name), | |
690 | "%02x-%012llx", | |
691 | (unsigned int) sl->reg_num.family, | |
692 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 693 | |
c6976a4e | 694 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 695 | dev_name(&sl->dev), sl); |
1da177e4 LT |
696 | |
697 | err = device_register(&sl->dev); | |
698 | if (err < 0) { | |
699 | dev_err(&sl->dev, | |
6b729861 | 700 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 701 | dev_name(&sl->dev), err); |
1da177e4 LT |
702 | return err; |
703 | } | |
704 | ||
1da177e4 | 705 | |
47eba33a GKH |
706 | dev_set_uevent_suppress(&sl->dev, false); |
707 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
708 | |
709 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
714 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
715 | { | |
716 | struct w1_slave *sl; | |
717 | struct w1_family *f; | |
718 | int err; | |
719 | struct w1_netlink_msg msg; | |
720 | ||
dd00cc48 | 721 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
722 | if (!sl) { |
723 | dev_err(&dev->dev, | |
724 | "%s: failed to allocate new slave device.\n", | |
725 | __func__); | |
726 | return -ENOMEM; | |
727 | } | |
728 | ||
1da177e4 LT |
729 | |
730 | sl->owner = THIS_MODULE; | |
731 | sl->master = dev; | |
bb670937 | 732 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 733 | |
12003375 | 734 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
735 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
736 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 737 | init_completion(&sl->released); |
1da177e4 | 738 | |
bc04d76d HFV |
739 | /* slave modules need to be loaded in a context with unlocked mutex */ |
740 | mutex_unlock(&dev->mutex); | |
8d7bda51 | 741 | request_module("w1-family-0x%0x", rn->family); |
bc04d76d | 742 | mutex_lock(&dev->mutex); |
8d7bda51 | 743 | |
1da177e4 LT |
744 | spin_lock(&w1_flock); |
745 | f = w1_family_registered(rn->family); | |
746 | if (!f) { | |
99c5bfe9 | 747 | f= &w1_default_family; |
1da177e4 LT |
748 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
749 | rn->family, rn->family, | |
750 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
751 | } |
752 | __w1_family_get(f); | |
753 | spin_unlock(&w1_flock); | |
754 | ||
755 | sl->family = f; | |
756 | ||
757 | ||
758 | err = __w1_attach_slave_device(sl); | |
759 | if (err < 0) { | |
760 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
761 | sl->name); | |
762 | w1_family_put(sl->family); | |
763 | kfree(sl); | |
764 | return err; | |
765 | } | |
766 | ||
767 | sl->ttl = dev->slave_ttl; | |
768 | dev->slave_count++; | |
769 | ||
12003375 | 770 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
771 | msg.type = W1_SLAVE_ADD; |
772 | w1_netlink_send(dev, &msg); | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
c30c9b15 | 777 | void w1_slave_detach(struct w1_slave *sl) |
1da177e4 LT |
778 | { |
779 | struct w1_netlink_msg msg; | |
7785925d | 780 | |
7c8f5703 | 781 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 782 | |
3aca692d | 783 | list_del(&sl->w1_slave_entry); |
1da177e4 | 784 | |
12003375 EP |
785 | memset(&msg, 0, sizeof(msg)); |
786 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
787 | msg.type = W1_SLAVE_REMOVE; |
788 | w1_netlink_send(sl->master, &msg); | |
789 | ||
1da177e4 | 790 | device_unregister(&sl->dev); |
1da177e4 | 791 | |
3aca692d EP |
792 | wait_for_completion(&sl->released); |
793 | kfree(sl); | |
1da177e4 LT |
794 | } |
795 | ||
12003375 EP |
796 | struct w1_master *w1_search_master_id(u32 id) |
797 | { | |
798 | struct w1_master *dev; | |
799 | int found = 0; | |
800 | ||
abd52a13 | 801 | mutex_lock(&w1_mlock); |
12003375 EP |
802 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
803 | if (dev->id == id) { | |
804 | found = 1; | |
805 | atomic_inc(&dev->refcnt); | |
806 | break; | |
807 | } | |
808 | } | |
abd52a13 | 809 | mutex_unlock(&w1_mlock); |
12003375 EP |
810 | |
811 | return (found)?dev:NULL; | |
812 | } | |
813 | ||
814 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
815 | { | |
816 | struct w1_master *dev; | |
817 | struct w1_slave *sl = NULL; | |
818 | int found = 0; | |
819 | ||
abd52a13 | 820 | mutex_lock(&w1_mlock); |
12003375 | 821 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 822 | mutex_lock(&dev->mutex); |
12003375 EP |
823 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
824 | if (sl->reg_num.family == id->family && | |
825 | sl->reg_num.id == id->id && | |
826 | sl->reg_num.crc == id->crc) { | |
827 | found = 1; | |
828 | atomic_inc(&dev->refcnt); | |
829 | atomic_inc(&sl->refcnt); | |
830 | break; | |
831 | } | |
832 | } | |
abd52a13 | 833 | mutex_unlock(&dev->mutex); |
12003375 EP |
834 | |
835 | if (found) | |
836 | break; | |
837 | } | |
abd52a13 | 838 | mutex_unlock(&w1_mlock); |
12003375 EP |
839 | |
840 | return (found)?sl:NULL; | |
841 | } | |
842 | ||
c30c9b15 | 843 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 844 | { |
c30c9b15 | 845 | struct w1_slave *sl, *sln; |
6adf87bd EP |
846 | struct w1_master *dev; |
847 | ||
abd52a13 | 848 | mutex_lock(&w1_mlock); |
6adf87bd | 849 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
850 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
851 | "for family %02x.\n", dev->name, f->fid); | |
852 | mutex_lock(&dev->mutex); | |
853 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
854 | /* If it is a new family, slaves with the default | |
855 | * family driver and are that family will be | |
856 | * connected. If the family is going away, devices | |
857 | * matching that family are reconneced. | |
858 | */ | |
859 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
860 | && sl->reg_num.family == f->fid) || | |
861 | (!attach && sl->family->fid == f->fid)) { | |
862 | struct w1_reg_num rn; | |
863 | ||
864 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
865 | w1_slave_detach(sl); | |
866 | ||
867 | w1_attach_slave_device(dev, &rn); | |
868 | } | |
869 | } | |
870 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
871 | "has been finished.\n", dev->name); | |
872 | mutex_unlock(&dev->mutex); | |
6adf87bd | 873 | } |
abd52a13 | 874 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
875 | } |
876 | ||
963bb101 | 877 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 878 | { |
1da177e4 | 879 | struct w1_slave *sl; |
1da177e4 | 880 | struct w1_reg_num *tmp; |
0e65f828 | 881 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 882 | |
c30c9b15 | 883 | atomic_inc(&dev->refcnt); |
7785925d | 884 | |
1da177e4 LT |
885 | tmp = (struct w1_reg_num *) &rn; |
886 | ||
cd7b28d3 DF |
887 | sl = w1_slave_search_device(dev, tmp); |
888 | if (sl) { | |
bb670937 | 889 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
890 | } else { |
891 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
892 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 893 | } |
7785925d | 894 | |
1da177e4 LT |
895 | atomic_dec(&dev->refcnt); |
896 | } | |
897 | ||
6b729861 EP |
898 | /** |
899 | * Performs a ROM Search & registers any devices found. | |
900 | * The 1-wire search is a simple binary tree search. | |
901 | * For each bit of the address, we read two bits and write one bit. | |
902 | * The bit written will put to sleep all devies that don't match that bit. | |
903 | * When the two reads differ, the direction choice is obvious. | |
904 | * When both bits are 0, we must choose a path to take. | |
905 | * When we can scan all 64 bits without having to choose a path, we are done. | |
906 | * | |
907 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
908 | * | |
909 | * @dev The master device to search | |
910 | * @cb Function to call when a device is found | |
911 | */ | |
12003375 | 912 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 913 | { |
6b729861 EP |
914 | u64 last_rn, rn, tmp64; |
915 | int i, slave_count = 0; | |
916 | int last_zero, last_device; | |
917 | int search_bit, desc_bit; | |
918 | u8 triplet_ret = 0; | |
1da177e4 | 919 | |
6b729861 | 920 | search_bit = 0; |
3c6955e5 DF |
921 | rn = dev->search_id; |
922 | last_rn = 0; | |
6b729861 EP |
923 | last_device = 0; |
924 | last_zero = -1; | |
1da177e4 LT |
925 | |
926 | desc_bit = 64; | |
927 | ||
6b729861 EP |
928 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
929 | last_rn = rn; | |
1da177e4 LT |
930 | rn = 0; |
931 | ||
1da177e4 LT |
932 | /* |
933 | * Reset bus and all 1-wire device state machines | |
934 | * so they can respond to our requests. | |
935 | * | |
936 | * Return 0 - device(s) present, 1 - no devices present. | |
937 | */ | |
b02f8bed | 938 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 939 | if (w1_reset_bus(dev)) { |
b02f8bed | 940 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 941 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
942 | break; |
943 | } | |
944 | ||
c9cbf558 EP |
945 | /* Do fast search on single slave bus */ |
946 | if (dev->max_slave_count == 1) { | |
b02f8bed | 947 | int rv; |
c9cbf558 | 948 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
949 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
950 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 951 | |
b02f8bed | 952 | if (rv == 8 && rn) |
c9cbf558 EP |
953 | cb(dev, rn); |
954 | ||
955 | break; | |
956 | } | |
957 | ||
6b729861 | 958 | /* Start the search */ |
12003375 | 959 | w1_write_8(dev, search_type); |
1da177e4 | 960 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
961 | /* Determine the direction/search bit */ |
962 | if (i == desc_bit) | |
963 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
964 | else if (i > desc_bit) | |
965 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 966 | else |
6b729861 | 967 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 968 | |
6b729861 EP |
969 | /** Read two bits and write one bit */ |
970 | triplet_ret = w1_triplet(dev, search_bit); | |
971 | ||
972 | /* quit if no device responded */ | |
973 | if ( (triplet_ret & 0x03) == 0x03 ) | |
974 | break; | |
1da177e4 | 975 | |
6b729861 EP |
976 | /* If both directions were valid, and we took the 0 path... */ |
977 | if (triplet_ret == 0) | |
978 | last_zero = i; | |
1da177e4 | 979 | |
6b729861 EP |
980 | /* extract the direction taken & update the device number */ |
981 | tmp64 = (triplet_ret >> 2); | |
982 | rn |= (tmp64 << i); | |
0d671b27 | 983 | |
42105698 | 984 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 985 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 986 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
987 | return; |
988 | } | |
6b729861 | 989 | } |
b02f8bed | 990 | mutex_unlock(&dev->bus_mutex); |
7785925d | 991 | |
6b729861 | 992 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 993 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 994 | last_device = 1; |
3c6955e5 DF |
995 | dev->search_id = 0; |
996 | } else { | |
997 | dev->search_id = rn; | |
998 | } | |
6b729861 | 999 | desc_bit = last_zero; |
c30c9b15 | 1000 | cb(dev, rn); |
6b729861 | 1001 | } |
a1613056 DF |
1002 | |
1003 | if (!last_device && slave_count == dev->max_slave_count && | |
1004 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1005 | /* Only max_slave_count will be scanned in a search, |
1006 | * but it will start where it left off next search | |
1007 | * until all ids are identified and then it will start | |
1008 | * over. A continued search will report the previous | |
1009 | * last id as the first id (provided it is still on the | |
1010 | * bus). | |
1011 | */ | |
a1613056 | 1012 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1013 | "will continue next search.\n", __func__, |
a1613056 DF |
1014 | dev->max_slave_count); |
1015 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1016 | } | |
1da177e4 LT |
1017 | } |
1018 | } | |
1019 | ||
963bb101 DF |
1020 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1021 | w1_slave_found_callback cb) | |
12003375 EP |
1022 | { |
1023 | struct w1_slave *sl, *sln; | |
1024 | ||
1025 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
bb670937 | 1026 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
12003375 | 1027 | |
963bb101 | 1028 | w1_search_devices(dev, search_type, cb); |
12003375 EP |
1029 | |
1030 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
bb670937 | 1031 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) |
12003375 | 1032 | w1_slave_detach(sl); |
bb670937 | 1033 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1034 | sl->ttl = dev->slave_ttl; |
1035 | } | |
1036 | ||
1037 | if (dev->search_count > 0) | |
1038 | dev->search_count--; | |
1039 | } | |
1040 | ||
963bb101 DF |
1041 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1042 | { | |
1043 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1044 | } | |
1045 | ||
1da177e4 LT |
1046 | int w1_process(void *data) |
1047 | { | |
1048 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1049 | /* As long as w1_timeout is only set by a module parameter the sleep |
1050 | * time can be calculated in jiffies once. | |
1051 | */ | |
1052 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); | |
1da177e4 | 1053 | |
3c52e4e6 | 1054 | while (!kthread_should_stop()) { |
01e14d6d DF |
1055 | if (dev->search_count) { |
1056 | mutex_lock(&dev->mutex); | |
1057 | w1_search_process(dev, W1_SEARCH); | |
1058 | mutex_unlock(&dev->mutex); | |
1059 | } | |
1060 | ||
3e1d1d28 | 1061 | try_to_freeze(); |
3c52e4e6 DF |
1062 | __set_current_state(TASK_INTERRUPTIBLE); |
1063 | ||
1064 | if (kthread_should_stop()) | |
1065 | break; | |
1066 | ||
1067 | /* Only sleep when the search is active. */ | |
1068 | if (dev->search_count) | |
1069 | schedule_timeout(jtime); | |
1070 | else | |
1071 | schedule(); | |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1075 | |
1076 | return 0; | |
1077 | } | |
1078 | ||
73a98fce | 1079 | static int __init w1_init(void) |
1da177e4 LT |
1080 | { |
1081 | int retval; | |
1082 | ||
1083 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
1084 | ||
12003375 EP |
1085 | w1_init_netlink(); |
1086 | ||
1da177e4 LT |
1087 | retval = bus_register(&w1_bus_type); |
1088 | if (retval) { | |
1089 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
1090 | goto err_out_exit_init; | |
1091 | } | |
1092 | ||
47eba33a GKH |
1093 | retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb); |
1094 | if (retval) | |
1095 | goto err_out_bus_unregister; | |
1096 | ||
7f772ed8 | 1097 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
1098 | if (retval) { |
1099 | printk(KERN_ERR | |
1100 | "Failed to register master driver. err=%d.\n", | |
1101 | retval); | |
1102 | goto err_out_bus_unregister; | |
1103 | } | |
1104 | ||
7f772ed8 EP |
1105 | retval = driver_register(&w1_slave_driver); |
1106 | if (retval) { | |
1107 | printk(KERN_ERR | |
ecf19489 | 1108 | "Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1109 | retval); |
1110 | goto err_out_master_unregister; | |
1111 | } | |
1112 | ||
1da177e4 LT |
1113 | return 0; |
1114 | ||
c30c9b15 DF |
1115 | #if 0 |
1116 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1117 | err_out_slave_unregister: |
1118 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1119 | #endif |
7f772ed8 EP |
1120 | |
1121 | err_out_master_unregister: | |
1122 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1123 | |
1124 | err_out_bus_unregister: | |
1125 | bus_unregister(&w1_bus_type); | |
1126 | ||
1127 | err_out_exit_init: | |
1128 | return retval; | |
1129 | } | |
1130 | ||
73a98fce | 1131 | static void __exit w1_fini(void) |
1da177e4 LT |
1132 | { |
1133 | struct w1_master *dev; | |
1da177e4 | 1134 | |
c30c9b15 | 1135 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1136 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1137 | __w1_remove_master_device(dev); |
1da177e4 | 1138 | |
12003375 EP |
1139 | w1_fini_netlink(); |
1140 | ||
7f772ed8 EP |
1141 | driver_unregister(&w1_slave_driver); |
1142 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1143 | bus_unregister(&w1_bus_type); |
1144 | } | |
1145 | ||
1146 | module_init(w1_init); | |
1147 | module_exit(w1_fini); |