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 | ||
1da177e4 LT |
59 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
60 | { | |
61 | return 1; | |
62 | } | |
63 | ||
64 | static int w1_master_probe(struct device *dev) | |
65 | { | |
66 | return -ENODEV; | |
67 | } | |
68 | ||
1da177e4 LT |
69 | static void w1_master_release(struct device *dev) |
70 | { | |
db2d0008 | 71 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
72 | |
73 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
74 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
75 | kfree(md); | |
1da177e4 LT |
76 | } |
77 | ||
78 | static void w1_slave_release(struct device *dev) | |
79 | { | |
db2d0008 | 80 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 81 | |
9fcbbac5 | 82 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
3aca692d EP |
83 | |
84 | w1_family_put(sl->family); | |
85 | sl->master->slave_count--; | |
1da177e4 LT |
86 | } |
87 | ||
5b187b3c | 88 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 89 | { |
3aca692d | 90 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 91 | |
3aca692d | 92 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 | 93 | } |
5b187b3c | 94 | static DEVICE_ATTR_RO(name); |
1da177e4 | 95 | |
5b187b3c | 96 | static ssize_t id_show(struct device *dev, |
07e00341 | 97 | struct device_attribute *attr, char *buf) |
1da177e4 | 98 | { |
07e00341 DF |
99 | struct w1_slave *sl = dev_to_w1_slave(dev); |
100 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 101 | |
07e00341 | 102 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 103 | return count; |
3aca692d | 104 | } |
5b187b3c | 105 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 106 | |
5b187b3c GKH |
107 | static struct attribute *w1_slave_attrs[] = { |
108 | &dev_attr_name.attr, | |
109 | &dev_attr_id.attr, | |
110 | NULL, | |
111 | }; | |
112 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 113 | |
d2a4ef6a | 114 | /* Default family */ |
f522d239 | 115 | |
36c27a65 GKH |
116 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
117 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
118 | size_t count) | |
f522d239 EP |
119 | { |
120 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
121 | ||
abd52a13 | 122 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
123 | if (w1_reset_select_slave(sl)) { |
124 | count = 0; | |
125 | goto out_up; | |
126 | } | |
127 | ||
128 | w1_write_block(sl->master, buf, count); | |
129 | ||
130 | out_up: | |
abd52a13 | 131 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
132 | return count; |
133 | } | |
134 | ||
36c27a65 GKH |
135 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
136 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
137 | size_t count) | |
f522d239 EP |
138 | { |
139 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
140 | ||
abd52a13 | 141 | mutex_lock(&sl->master->mutex); |
f522d239 | 142 | w1_read_block(sl->master, buf, count); |
abd52a13 | 143 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
144 | return count; |
145 | } | |
146 | ||
36c27a65 GKH |
147 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
148 | ||
149 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
150 | &bin_attr_rw, | |
151 | NULL, | |
f522d239 EP |
152 | }; |
153 | ||
36c27a65 GKH |
154 | static const struct attribute_group w1_slave_default_group = { |
155 | .bin_attrs = w1_slave_bin_attrs, | |
156 | }; | |
f522d239 | 157 | |
36c27a65 GKH |
158 | static const struct attribute_group *w1_slave_default_groups[] = { |
159 | &w1_slave_default_group, | |
160 | NULL, | |
161 | }; | |
f522d239 EP |
162 | |
163 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 164 | .groups = w1_slave_default_groups, |
f522d239 EP |
165 | }; |
166 | ||
167 | static struct w1_family w1_default_family = { | |
168 | .fops = &w1_default_fops, | |
169 | }; | |
d2a4ef6a | 170 | |
7eff2e7a | 171 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 172 | |
1da177e4 LT |
173 | static struct bus_type w1_bus_type = { |
174 | .name = "w1", | |
175 | .match = w1_master_match, | |
312c004d | 176 | .uevent = w1_uevent, |
1da177e4 LT |
177 | }; |
178 | ||
7f772ed8 EP |
179 | struct device_driver w1_master_driver = { |
180 | .name = "w1_master_driver", | |
1da177e4 LT |
181 | .bus = &w1_bus_type, |
182 | .probe = w1_master_probe, | |
1da177e4 LT |
183 | }; |
184 | ||
7f772ed8 | 185 | struct device w1_master_device = { |
1da177e4 LT |
186 | .parent = NULL, |
187 | .bus = &w1_bus_type, | |
40f91de6 | 188 | .init_name = "w1 bus master", |
7f772ed8 | 189 | .driver = &w1_master_driver, |
1da177e4 LT |
190 | .release = &w1_master_release |
191 | }; | |
192 | ||
2c5bfdac | 193 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
194 | .name = "w1_slave_driver", |
195 | .bus = &w1_bus_type, | |
196 | }; | |
197 | ||
2c5bfdac | 198 | #if 0 |
7f772ed8 EP |
199 | struct device w1_slave_device = { |
200 | .parent = NULL, | |
201 | .bus = &w1_bus_type, | |
40f91de6 | 202 | .init_name = "w1 bus slave", |
7f772ed8 | 203 | .driver = &w1_slave_driver, |
3aca692d | 204 | .release = &w1_slave_release |
7f772ed8 | 205 | }; |
2c5bfdac | 206 | #endif /* 0 */ |
7f772ed8 | 207 | |
060b8845 | 208 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 209 | { |
db2d0008 | 210 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 211 | ssize_t count; |
7785925d | 212 | |
abd52a13 | 213 | mutex_lock(&md->mutex); |
1da177e4 | 214 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 215 | mutex_unlock(&md->mutex); |
1da177e4 LT |
216 | |
217 | return count; | |
218 | } | |
219 | ||
2a9d0c17 EP |
220 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
221 | struct device_attribute *attr, | |
222 | const char * buf, size_t count) | |
223 | { | |
6a158c0d | 224 | long tmp; |
db2d0008 | 225 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 226 | int ret; |
2a9d0c17 | 227 | |
bf4228f0 JH |
228 | ret = kstrtol(buf, 0, &tmp); |
229 | if (ret) | |
230 | return ret; | |
6a158c0d | 231 | |
abd52a13 | 232 | mutex_lock(&md->mutex); |
6a158c0d | 233 | md->search_count = tmp; |
abd52a13 | 234 | mutex_unlock(&md->mutex); |
af8c7237 DF |
235 | /* Only wake if it is going to be searching. */ |
236 | if (tmp) | |
237 | wake_up_process(md->thread); | |
2a9d0c17 EP |
238 | |
239 | return count; | |
240 | } | |
241 | ||
242 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
243 | struct device_attribute *attr, | |
244 | char *buf) | |
245 | { | |
db2d0008 | 246 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
247 | ssize_t count; |
248 | ||
abd52a13 | 249 | mutex_lock(&md->mutex); |
2a9d0c17 | 250 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 251 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
252 | |
253 | return count; | |
254 | } | |
255 | ||
6a158c0d DF |
256 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
257 | struct device_attribute *attr, | |
258 | const char *buf, size_t count) | |
259 | { | |
260 | long tmp; | |
261 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 262 | int ret; |
6a158c0d | 263 | |
bf4228f0 JH |
264 | ret = kstrtol(buf, 0, &tmp); |
265 | if (ret) | |
266 | return ret; | |
6a158c0d DF |
267 | |
268 | mutex_lock(&md->mutex); | |
269 | md->enable_pullup = tmp; | |
270 | mutex_unlock(&md->mutex); | |
6a158c0d DF |
271 | |
272 | return count; | |
273 | } | |
274 | ||
275 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
276 | struct device_attribute *attr, | |
277 | char *buf) | |
278 | { | |
279 | struct w1_master *md = dev_to_w1_master(dev); | |
280 | ssize_t count; | |
281 | ||
282 | mutex_lock(&md->mutex); | |
283 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
284 | mutex_unlock(&md->mutex); | |
285 | ||
286 | return count; | |
287 | } | |
288 | ||
060b8845 | 289 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 290 | { |
db2d0008 | 291 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 292 | ssize_t count; |
7785925d | 293 | |
abd52a13 | 294 | mutex_lock(&md->mutex); |
1da177e4 | 295 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 296 | mutex_unlock(&md->mutex); |
1da177e4 LT |
297 | return count; |
298 | } | |
299 | ||
060b8845 | 300 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
301 | { |
302 | ssize_t count; | |
303 | count = sprintf(buf, "%d\n", w1_timeout); | |
304 | return count; | |
305 | } | |
306 | ||
a1613056 DF |
307 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
308 | struct device_attribute *attr, const char *buf, size_t count) | |
309 | { | |
310 | long tmp; | |
311 | struct w1_master *md = dev_to_w1_master(dev); | |
312 | ||
313 | if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1) | |
314 | return -EINVAL; | |
315 | ||
316 | mutex_lock(&md->mutex); | |
317 | md->max_slave_count = tmp; | |
318 | /* allow each time the max_slave_count is updated */ | |
319 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
320 | mutex_unlock(&md->mutex); | |
321 | ||
322 | return count; | |
323 | } | |
324 | ||
060b8845 | 325 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 326 | { |
db2d0008 | 327 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 328 | ssize_t count; |
7785925d | 329 | |
abd52a13 | 330 | mutex_lock(&md->mutex); |
1da177e4 | 331 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 332 | mutex_unlock(&md->mutex); |
1da177e4 LT |
333 | return count; |
334 | } | |
335 | ||
060b8845 | 336 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 337 | { |
db2d0008 | 338 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 339 | ssize_t count; |
7785925d | 340 | |
abd52a13 | 341 | mutex_lock(&md->mutex); |
1da177e4 | 342 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 343 | mutex_unlock(&md->mutex); |
1da177e4 LT |
344 | return count; |
345 | } | |
346 | ||
060b8845 | 347 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 348 | { |
db2d0008 | 349 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 350 | ssize_t count; |
7785925d | 351 | |
abd52a13 | 352 | mutex_lock(&md->mutex); |
1da177e4 | 353 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 354 | mutex_unlock(&md->mutex); |
1da177e4 LT |
355 | return count; |
356 | } | |
357 | ||
9b467411 DF |
358 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
359 | struct device_attribute *attr, char *buf) | |
1da177e4 | 360 | { |
db2d0008 | 361 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 362 | int c = PAGE_SIZE; |
9fcbbac5 DF |
363 | struct list_head *ent, *n; |
364 | struct w1_slave *sl = NULL; | |
1da177e4 | 365 | |
9fcbbac5 | 366 | mutex_lock(&md->list_mutex); |
1da177e4 | 367 | |
9fcbbac5 DF |
368 | list_for_each_safe(ent, n, &md->slist) { |
369 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
1da177e4 | 370 | |
9fcbbac5 | 371 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 | 372 | } |
9fcbbac5 DF |
373 | if (!sl) |
374 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
1da177e4 | 375 | |
9fcbbac5 | 376 | mutex_unlock(&md->list_mutex); |
1da177e4 LT |
377 | |
378 | return PAGE_SIZE - c; | |
379 | } | |
380 | ||
9b467411 DF |
381 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
382 | struct device_attribute *attr, char *buf) | |
383 | { | |
384 | int c = PAGE_SIZE; | |
385 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
386 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
387 | return PAGE_SIZE - c; | |
388 | } | |
389 | ||
390 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
391 | struct w1_reg_num *rn) | |
392 | { | |
393 | unsigned int family; | |
394 | unsigned long long id; | |
395 | int i; | |
396 | u64 rn64_le; | |
397 | ||
398 | /* The CRC value isn't read from the user because the sysfs directory | |
399 | * doesn't include it and most messages from the bus search don't | |
400 | * print it either. It would be unreasonable for the user to then | |
401 | * provide it. | |
402 | */ | |
403 | const char *error_msg = "bad slave string format, expecting " | |
404 | "ff-dddddddddddd\n"; | |
405 | ||
406 | if (buf[2] != '-') { | |
407 | dev_err(dev, "%s", error_msg); | |
408 | return -EINVAL; | |
409 | } | |
410 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
411 | if (i != 2) { | |
412 | dev_err(dev, "%s", error_msg); | |
413 | return -EINVAL; | |
414 | } | |
415 | rn->family = family; | |
416 | rn->id = id; | |
417 | ||
418 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
419 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
420 | ||
421 | #if 0 | |
422 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
423 | rn->family, (unsigned long long)rn->id, rn->crc); | |
424 | #endif | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
9fcbbac5 | 430 | * Note: must not hold list_mutex |
9b467411 | 431 | */ |
70b34d2e | 432 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
9b467411 DF |
433 | struct w1_reg_num *rn) |
434 | { | |
435 | struct w1_slave *sl; | |
9fcbbac5 | 436 | mutex_lock(&dev->list_mutex); |
9b467411 DF |
437 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
438 | if (sl->reg_num.family == rn->family && | |
439 | sl->reg_num.id == rn->id && | |
440 | sl->reg_num.crc == rn->crc) { | |
9fcbbac5 | 441 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
442 | return sl; |
443 | } | |
444 | } | |
9fcbbac5 | 445 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
446 | return NULL; |
447 | } | |
448 | ||
449 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
450 | struct device_attribute *attr, | |
451 | const char *buf, size_t count) | |
452 | { | |
453 | struct w1_master *md = dev_to_w1_master(dev); | |
454 | struct w1_reg_num rn; | |
455 | struct w1_slave *sl; | |
456 | ssize_t result = count; | |
457 | ||
458 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
459 | return -EINVAL; | |
460 | ||
461 | mutex_lock(&md->mutex); | |
462 | sl = w1_slave_search_device(md, &rn); | |
463 | /* It would be nice to do a targeted search one the one-wire bus | |
464 | * for the new device to see if it is out there or not. But the | |
465 | * current search doesn't support that. | |
466 | */ | |
467 | if (sl) { | |
468 | dev_info(dev, "Device %s already exists\n", sl->name); | |
469 | result = -EINVAL; | |
470 | } else { | |
471 | w1_attach_slave_device(md, &rn); | |
472 | } | |
473 | mutex_unlock(&md->mutex); | |
474 | ||
475 | return result; | |
476 | } | |
477 | ||
478 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
479 | struct device_attribute *attr, char *buf) | |
480 | { | |
481 | int c = PAGE_SIZE; | |
482 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
483 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
484 | return PAGE_SIZE - c; | |
485 | } | |
486 | ||
487 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
488 | struct device_attribute *attr, | |
489 | const char *buf, size_t count) | |
490 | { | |
491 | struct w1_master *md = dev_to_w1_master(dev); | |
492 | struct w1_reg_num rn; | |
493 | struct w1_slave *sl; | |
494 | ssize_t result = count; | |
495 | ||
496 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
497 | return -EINVAL; | |
498 | ||
499 | mutex_lock(&md->mutex); | |
500 | sl = w1_slave_search_device(md, &rn); | |
501 | if (sl) { | |
9fcbbac5 DF |
502 | result = w1_slave_detach(sl); |
503 | /* refcnt 0 means it was detached in the call */ | |
504 | if (result == 0) | |
505 | result = count; | |
9b467411 DF |
506 | } else { |
507 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
508 | (unsigned long long)rn.id); | |
509 | result = -EINVAL; | |
510 | } | |
511 | mutex_unlock(&md->mutex); | |
512 | ||
513 | return result; | |
514 | } | |
515 | ||
7785925d EP |
516 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
517 | struct device_attribute w1_master_attribute_##_name = \ | |
518 | __ATTR(w1_master_##_name, _mode, \ | |
519 | w1_master_attribute_show_##_name, NULL) | |
520 | ||
2a9d0c17 EP |
521 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
522 | struct device_attribute w1_master_attribute_##_name = \ | |
523 | __ATTR(w1_master_##_name, _mode, \ | |
524 | w1_master_attribute_show_##_name, \ | |
525 | w1_master_attribute_store_##_name) | |
526 | ||
7785925d EP |
527 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
528 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
529 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 530 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
531 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
532 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
533 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
12aa4c64 BS |
534 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
535 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
536 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
537 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
538 | |
539 | static struct attribute *w1_master_default_attrs[] = { | |
540 | &w1_master_attribute_name.attr, | |
541 | &w1_master_attribute_slaves.attr, | |
542 | &w1_master_attribute_slave_count.attr, | |
543 | &w1_master_attribute_max_slave_count.attr, | |
544 | &w1_master_attribute_attempts.attr, | |
545 | &w1_master_attribute_timeout.attr, | |
546 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 547 | &w1_master_attribute_search.attr, |
6a158c0d | 548 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
549 | &w1_master_attribute_add.attr, |
550 | &w1_master_attribute_remove.attr, | |
7785925d | 551 | NULL |
1da177e4 LT |
552 | }; |
553 | ||
7785925d EP |
554 | static struct attribute_group w1_master_defattr_group = { |
555 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
556 | }; |
557 | ||
7785925d EP |
558 | int w1_create_master_attributes(struct w1_master *master) |
559 | { | |
560 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
561 | } | |
562 | ||
c30c9b15 | 563 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
564 | { |
565 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
566 | } | |
567 | ||
7eff2e7a | 568 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
569 | { |
570 | struct w1_master *md = NULL; | |
571 | struct w1_slave *sl = NULL; | |
572 | char *event_owner, *name; | |
526be416 | 573 | int err = 0; |
7f772ed8 EP |
574 | |
575 | if (dev->driver == &w1_master_driver) { | |
576 | md = container_of(dev, struct w1_master, dev); | |
577 | event_owner = "master"; | |
578 | name = md->name; | |
579 | } else if (dev->driver == &w1_slave_driver) { | |
580 | sl = container_of(dev, struct w1_slave, dev); | |
581 | event_owner = "slave"; | |
582 | name = sl->name; | |
583 | } else { | |
312c004d | 584 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
585 | return -EINVAL; |
586 | } | |
587 | ||
c6976a4e | 588 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 589 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
590 | |
591 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 592 | goto end; |
7f772ed8 | 593 | |
7eff2e7a | 594 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 595 | if (err) |
526be416 | 596 | goto end; |
7f772ed8 | 597 | |
7eff2e7a KS |
598 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
599 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
600 | end: |
601 | return err; | |
602 | } | |
7f772ed8 | 603 | |
47eba33a GKH |
604 | /* |
605 | * Handle sysfs file creation and removal here, before userspace is told that | |
606 | * the device is added / removed from the system | |
607 | */ | |
608 | static int w1_bus_notify(struct notifier_block *nb, unsigned long action, | |
609 | void *data) | |
610 | { | |
611 | struct device *dev = data; | |
612 | struct w1_slave *sl; | |
36c27a65 | 613 | struct w1_family_ops *fops; |
47eba33a GKH |
614 | int err; |
615 | ||
616 | /* | |
617 | * Only care about slave devices at the moment. Yes, we should use a | |
618 | * separate "type" for this, but for now, look at the release function | |
619 | * to know which type it is... | |
620 | */ | |
621 | if (dev->release != w1_slave_release) | |
622 | return 0; | |
623 | ||
624 | sl = dev_to_w1_slave(dev); | |
36c27a65 | 625 | fops = sl->family->fops; |
47eba33a | 626 | |
2962aece HFV |
627 | if (!fops) |
628 | return 0; | |
629 | ||
47eba33a GKH |
630 | switch (action) { |
631 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 632 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
633 | if (fops->add_slave) { |
634 | err = fops->add_slave(sl); | |
635 | if (err < 0) { | |
636 | dev_err(&sl->dev, | |
637 | "add_slave() call failed. err=%d\n", | |
638 | err); | |
639 | return err; | |
640 | } | |
641 | } | |
642 | if (fops->groups) { | |
643 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
644 | if (err) { | |
645 | dev_err(&sl->dev, | |
646 | "sysfs group creation failed. err=%d\n", | |
647 | err); | |
648 | return err; | |
649 | } | |
47eba33a GKH |
650 | } |
651 | ||
652 | break; | |
653 | case BUS_NOTIFY_DEL_DEVICE: | |
36c27a65 | 654 | if (fops->remove_slave) |
47eba33a | 655 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
656 | if (fops->groups) |
657 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
658 | break; |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static struct notifier_block w1_bus_nb = { | |
664 | .notifier_call = w1_bus_notify, | |
665 | }; | |
666 | ||
1da177e4 LT |
667 | static int __w1_attach_slave_device(struct w1_slave *sl) |
668 | { | |
669 | int err; | |
670 | ||
671 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 672 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
673 | sl->dev.bus = &w1_bus_type; |
674 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 675 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 676 | |
40f91de6 | 677 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
678 | (unsigned int) sl->reg_num.family, |
679 | (unsigned long long) sl->reg_num.id); | |
680 | snprintf(&sl->name[0], sizeof(sl->name), | |
681 | "%02x-%012llx", | |
682 | (unsigned int) sl->reg_num.family, | |
683 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 684 | |
c6976a4e | 685 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 686 | dev_name(&sl->dev), sl); |
1da177e4 LT |
687 | |
688 | err = device_register(&sl->dev); | |
689 | if (err < 0) { | |
690 | dev_err(&sl->dev, | |
6b729861 | 691 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 692 | dev_name(&sl->dev), err); |
1da177e4 LT |
693 | return err; |
694 | } | |
695 | ||
1da177e4 | 696 | |
47eba33a GKH |
697 | dev_set_uevent_suppress(&sl->dev, false); |
698 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 | 699 | |
9fcbbac5 | 700 | mutex_lock(&sl->master->list_mutex); |
1da177e4 | 701 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
9fcbbac5 | 702 | mutex_unlock(&sl->master->list_mutex); |
1da177e4 LT |
703 | |
704 | return 0; | |
705 | } | |
706 | ||
70b34d2e | 707 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
1da177e4 LT |
708 | { |
709 | struct w1_slave *sl; | |
710 | struct w1_family *f; | |
711 | int err; | |
712 | struct w1_netlink_msg msg; | |
713 | ||
dd00cc48 | 714 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
715 | if (!sl) { |
716 | dev_err(&dev->dev, | |
717 | "%s: failed to allocate new slave device.\n", | |
718 | __func__); | |
719 | return -ENOMEM; | |
720 | } | |
721 | ||
1da177e4 LT |
722 | |
723 | sl->owner = THIS_MODULE; | |
724 | sl->master = dev; | |
bb670937 | 725 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 726 | |
12003375 | 727 | memset(&msg, 0, sizeof(msg)); |
1da177e4 | 728 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
9fcbbac5 DF |
729 | atomic_set(&sl->refcnt, 1); |
730 | atomic_inc(&sl->master->refcnt); | |
1da177e4 | 731 | |
bc04d76d HFV |
732 | /* slave modules need to be loaded in a context with unlocked mutex */ |
733 | mutex_unlock(&dev->mutex); | |
8d7bda51 | 734 | request_module("w1-family-0x%0x", rn->family); |
bc04d76d | 735 | mutex_lock(&dev->mutex); |
8d7bda51 | 736 | |
1da177e4 LT |
737 | spin_lock(&w1_flock); |
738 | f = w1_family_registered(rn->family); | |
739 | if (!f) { | |
99c5bfe9 | 740 | f= &w1_default_family; |
1da177e4 LT |
741 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
742 | rn->family, rn->family, | |
743 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
744 | } |
745 | __w1_family_get(f); | |
746 | spin_unlock(&w1_flock); | |
747 | ||
748 | sl->family = f; | |
749 | ||
750 | ||
751 | err = __w1_attach_slave_device(sl); | |
752 | if (err < 0) { | |
753 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
754 | sl->name); | |
755 | w1_family_put(sl->family); | |
756 | kfree(sl); | |
757 | return err; | |
758 | } | |
759 | ||
760 | sl->ttl = dev->slave_ttl; | |
761 | dev->slave_count++; | |
762 | ||
12003375 | 763 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
764 | msg.type = W1_SLAVE_ADD; |
765 | w1_netlink_send(dev, &msg); | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
9fcbbac5 | 770 | int w1_unref_slave(struct w1_slave *sl) |
1da177e4 | 771 | { |
9fcbbac5 DF |
772 | struct w1_master *dev = sl->master; |
773 | int refcnt; | |
774 | mutex_lock(&dev->list_mutex); | |
775 | refcnt = atomic_sub_return(1, &sl->refcnt); | |
776 | if (refcnt == 0) { | |
777 | struct w1_netlink_msg msg; | |
778 | ||
779 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, | |
780 | sl->name, sl); | |
781 | ||
782 | list_del(&sl->w1_slave_entry); | |
783 | ||
784 | memset(&msg, 0, sizeof(msg)); | |
785 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
786 | msg.type = W1_SLAVE_REMOVE; | |
787 | w1_netlink_send(sl->master, &msg); | |
788 | ||
789 | device_unregister(&sl->dev); | |
790 | #ifdef DEBUG | |
791 | memset(sl, 0, sizeof(*sl)); | |
792 | #endif | |
793 | kfree(sl); | |
794 | } | |
795 | atomic_dec(&dev->refcnt); | |
796 | mutex_unlock(&dev->list_mutex); | |
797 | return refcnt; | |
798 | } | |
1da177e4 | 799 | |
9fcbbac5 DF |
800 | int w1_slave_detach(struct w1_slave *sl) |
801 | { | |
802 | /* Only detach a slave once as it decreases the refcnt each time. */ | |
803 | int destroy_now; | |
804 | mutex_lock(&sl->master->list_mutex); | |
805 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); | |
806 | set_bit(W1_SLAVE_DETACH, &sl->flags); | |
807 | mutex_unlock(&sl->master->list_mutex); | |
808 | ||
809 | if (destroy_now) | |
810 | destroy_now = !w1_unref_slave(sl); | |
811 | return destroy_now ? 0 : -EBUSY; | |
1da177e4 LT |
812 | } |
813 | ||
12003375 EP |
814 | struct w1_master *w1_search_master_id(u32 id) |
815 | { | |
816 | struct w1_master *dev; | |
817 | int found = 0; | |
818 | ||
abd52a13 | 819 | mutex_lock(&w1_mlock); |
12003375 EP |
820 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
821 | if (dev->id == id) { | |
822 | found = 1; | |
823 | atomic_inc(&dev->refcnt); | |
824 | break; | |
825 | } | |
826 | } | |
abd52a13 | 827 | mutex_unlock(&w1_mlock); |
12003375 EP |
828 | |
829 | return (found)?dev:NULL; | |
830 | } | |
831 | ||
832 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
833 | { | |
834 | struct w1_master *dev; | |
835 | struct w1_slave *sl = NULL; | |
836 | int found = 0; | |
837 | ||
abd52a13 | 838 | mutex_lock(&w1_mlock); |
12003375 | 839 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
9fcbbac5 | 840 | mutex_lock(&dev->list_mutex); |
12003375 EP |
841 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
842 | if (sl->reg_num.family == id->family && | |
843 | sl->reg_num.id == id->id && | |
844 | sl->reg_num.crc == id->crc) { | |
845 | found = 1; | |
846 | atomic_inc(&dev->refcnt); | |
847 | atomic_inc(&sl->refcnt); | |
848 | break; | |
849 | } | |
850 | } | |
9fcbbac5 | 851 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
852 | |
853 | if (found) | |
854 | break; | |
855 | } | |
abd52a13 | 856 | mutex_unlock(&w1_mlock); |
12003375 EP |
857 | |
858 | return (found)?sl:NULL; | |
859 | } | |
860 | ||
c30c9b15 | 861 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 862 | { |
c30c9b15 | 863 | struct w1_slave *sl, *sln; |
6adf87bd EP |
864 | struct w1_master *dev; |
865 | ||
abd52a13 | 866 | mutex_lock(&w1_mlock); |
6adf87bd | 867 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
868 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
869 | "for family %02x.\n", dev->name, f->fid); | |
870 | mutex_lock(&dev->mutex); | |
9fcbbac5 | 871 | mutex_lock(&dev->list_mutex); |
c30c9b15 DF |
872 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
873 | /* If it is a new family, slaves with the default | |
874 | * family driver and are that family will be | |
875 | * connected. If the family is going away, devices | |
876 | * matching that family are reconneced. | |
877 | */ | |
878 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
879 | && sl->reg_num.family == f->fid) || | |
880 | (!attach && sl->family->fid == f->fid)) { | |
881 | struct w1_reg_num rn; | |
882 | ||
9fcbbac5 | 883 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 884 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
9fcbbac5 DF |
885 | /* If it was already in use let the automatic |
886 | * scan pick it up again later. | |
887 | */ | |
888 | if (!w1_slave_detach(sl)) | |
889 | w1_attach_slave_device(dev, &rn); | |
890 | mutex_lock(&dev->list_mutex); | |
c30c9b15 DF |
891 | } |
892 | } | |
893 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
894 | "has been finished.\n", dev->name); | |
9fcbbac5 | 895 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 896 | mutex_unlock(&dev->mutex); |
6adf87bd | 897 | } |
abd52a13 | 898 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
899 | } |
900 | ||
963bb101 | 901 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 902 | { |
1da177e4 | 903 | struct w1_slave *sl; |
1da177e4 | 904 | struct w1_reg_num *tmp; |
0e65f828 | 905 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 906 | |
c30c9b15 | 907 | atomic_inc(&dev->refcnt); |
7785925d | 908 | |
1da177e4 LT |
909 | tmp = (struct w1_reg_num *) &rn; |
910 | ||
cd7b28d3 DF |
911 | sl = w1_slave_search_device(dev, tmp); |
912 | if (sl) { | |
bb670937 | 913 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
914 | } else { |
915 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
916 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 917 | } |
7785925d | 918 | |
1da177e4 LT |
919 | atomic_dec(&dev->refcnt); |
920 | } | |
921 | ||
6b729861 EP |
922 | /** |
923 | * Performs a ROM Search & registers any devices found. | |
924 | * The 1-wire search is a simple binary tree search. | |
925 | * For each bit of the address, we read two bits and write one bit. | |
926 | * The bit written will put to sleep all devies that don't match that bit. | |
927 | * When the two reads differ, the direction choice is obvious. | |
928 | * When both bits are 0, we must choose a path to take. | |
929 | * When we can scan all 64 bits without having to choose a path, we are done. | |
930 | * | |
931 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
932 | * | |
933 | * @dev The master device to search | |
934 | * @cb Function to call when a device is found | |
935 | */ | |
12003375 | 936 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 937 | { |
6b729861 EP |
938 | u64 last_rn, rn, tmp64; |
939 | int i, slave_count = 0; | |
940 | int last_zero, last_device; | |
941 | int search_bit, desc_bit; | |
942 | u8 triplet_ret = 0; | |
1da177e4 | 943 | |
6b729861 | 944 | search_bit = 0; |
3c6955e5 DF |
945 | rn = dev->search_id; |
946 | last_rn = 0; | |
6b729861 EP |
947 | last_device = 0; |
948 | last_zero = -1; | |
1da177e4 LT |
949 | |
950 | desc_bit = 64; | |
951 | ||
6b729861 EP |
952 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
953 | last_rn = rn; | |
1da177e4 LT |
954 | rn = 0; |
955 | ||
1da177e4 LT |
956 | /* |
957 | * Reset bus and all 1-wire device state machines | |
958 | * so they can respond to our requests. | |
959 | * | |
960 | * Return 0 - device(s) present, 1 - no devices present. | |
961 | */ | |
b02f8bed | 962 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 963 | if (w1_reset_bus(dev)) { |
b02f8bed | 964 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 965 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
966 | break; |
967 | } | |
968 | ||
c9cbf558 EP |
969 | /* Do fast search on single slave bus */ |
970 | if (dev->max_slave_count == 1) { | |
b02f8bed | 971 | int rv; |
c9cbf558 | 972 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
973 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
974 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 975 | |
b02f8bed | 976 | if (rv == 8 && rn) |
c9cbf558 EP |
977 | cb(dev, rn); |
978 | ||
979 | break; | |
980 | } | |
981 | ||
6b729861 | 982 | /* Start the search */ |
12003375 | 983 | w1_write_8(dev, search_type); |
1da177e4 | 984 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
985 | /* Determine the direction/search bit */ |
986 | if (i == desc_bit) | |
987 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
988 | else if (i > desc_bit) | |
989 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 990 | else |
6b729861 | 991 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 992 | |
6b729861 EP |
993 | /** Read two bits and write one bit */ |
994 | triplet_ret = w1_triplet(dev, search_bit); | |
995 | ||
996 | /* quit if no device responded */ | |
997 | if ( (triplet_ret & 0x03) == 0x03 ) | |
998 | break; | |
1da177e4 | 999 | |
6b729861 EP |
1000 | /* If both directions were valid, and we took the 0 path... */ |
1001 | if (triplet_ret == 0) | |
1002 | last_zero = i; | |
1da177e4 | 1003 | |
6b729861 EP |
1004 | /* extract the direction taken & update the device number */ |
1005 | tmp64 = (triplet_ret >> 2); | |
1006 | rn |= (tmp64 << i); | |
0d671b27 | 1007 | |
42105698 | 1008 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 1009 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 1010 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
1011 | return; |
1012 | } | |
6b729861 | 1013 | } |
b02f8bed | 1014 | mutex_unlock(&dev->bus_mutex); |
7785925d | 1015 | |
6b729861 | 1016 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 1017 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 1018 | last_device = 1; |
3c6955e5 DF |
1019 | dev->search_id = 0; |
1020 | } else { | |
1021 | dev->search_id = rn; | |
1022 | } | |
6b729861 | 1023 | desc_bit = last_zero; |
c30c9b15 | 1024 | cb(dev, rn); |
6b729861 | 1025 | } |
a1613056 DF |
1026 | |
1027 | if (!last_device && slave_count == dev->max_slave_count && | |
1028 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1029 | /* Only max_slave_count will be scanned in a search, |
1030 | * but it will start where it left off next search | |
1031 | * until all ids are identified and then it will start | |
1032 | * over. A continued search will report the previous | |
1033 | * last id as the first id (provided it is still on the | |
1034 | * bus). | |
1035 | */ | |
a1613056 | 1036 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1037 | "will continue next search.\n", __func__, |
a1613056 DF |
1038 | dev->max_slave_count); |
1039 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1040 | } | |
1da177e4 LT |
1041 | } |
1042 | } | |
1043 | ||
963bb101 DF |
1044 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1045 | w1_slave_found_callback cb) | |
12003375 EP |
1046 | { |
1047 | struct w1_slave *sl, *sln; | |
1048 | ||
9fcbbac5 | 1049 | mutex_lock(&dev->list_mutex); |
12003375 | 1050 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
bb670937 | 1051 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
9fcbbac5 | 1052 | mutex_unlock(&dev->list_mutex); |
12003375 | 1053 | |
963bb101 | 1054 | w1_search_devices(dev, search_type, cb); |
12003375 | 1055 | |
9fcbbac5 | 1056 | mutex_lock(&dev->list_mutex); |
12003375 | 1057 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
9fcbbac5 DF |
1058 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
1059 | mutex_unlock(&dev->list_mutex); | |
12003375 | 1060 | w1_slave_detach(sl); |
9fcbbac5 DF |
1061 | mutex_lock(&dev->list_mutex); |
1062 | } | |
bb670937 | 1063 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1064 | sl->ttl = dev->slave_ttl; |
1065 | } | |
9fcbbac5 | 1066 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
1067 | |
1068 | if (dev->search_count > 0) | |
1069 | dev->search_count--; | |
1070 | } | |
1071 | ||
963bb101 DF |
1072 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1073 | { | |
1074 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1075 | } | |
1076 | ||
9fcbbac5 DF |
1077 | int w1_process_callbacks(struct w1_master *dev) |
1078 | { | |
1079 | int ret = 0; | |
1080 | struct w1_async_cmd *async_cmd, *async_n; | |
1081 | ||
1082 | /* The list can be added to in another thread, loop until it is empty */ | |
1083 | while (!list_empty(&dev->async_list)) { | |
1084 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, | |
1085 | async_entry) { | |
1086 | /* drop the lock, if it is a search it can take a long | |
1087 | * time */ | |
1088 | mutex_unlock(&dev->list_mutex); | |
1089 | async_cmd->cb(dev, async_cmd); | |
1090 | ret = 1; | |
1091 | mutex_lock(&dev->list_mutex); | |
1092 | } | |
1093 | } | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1da177e4 LT |
1097 | int w1_process(void *data) |
1098 | { | |
1099 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1100 | /* As long as w1_timeout is only set by a module parameter the sleep |
1101 | * time can be calculated in jiffies once. | |
1102 | */ | |
1103 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); | |
9fcbbac5 DF |
1104 | /* remainder if it woke up early */ |
1105 | unsigned long jremain = 0; | |
1da177e4 | 1106 | |
9fcbbac5 DF |
1107 | for (;;) { |
1108 | ||
1109 | if (!jremain && dev->search_count) { | |
01e14d6d DF |
1110 | mutex_lock(&dev->mutex); |
1111 | w1_search_process(dev, W1_SEARCH); | |
1112 | mutex_unlock(&dev->mutex); | |
1113 | } | |
1114 | ||
9fcbbac5 DF |
1115 | mutex_lock(&dev->list_mutex); |
1116 | /* Note, w1_process_callback drops the lock while processing, | |
1117 | * but locks it again before returning. | |
1118 | */ | |
1119 | if (!w1_process_callbacks(dev) && jremain) { | |
1120 | /* a wake up is either to stop the thread, process | |
1121 | * callbacks, or search, it isn't process callbacks, so | |
1122 | * schedule a search. | |
1123 | */ | |
1124 | jremain = 1; | |
1125 | } | |
1126 | ||
3e1d1d28 | 1127 | try_to_freeze(); |
3c52e4e6 DF |
1128 | __set_current_state(TASK_INTERRUPTIBLE); |
1129 | ||
9fcbbac5 DF |
1130 | /* hold list_mutex until after interruptible to prevent loosing |
1131 | * the wakeup signal when async_cmd is added. | |
1132 | */ | |
1133 | mutex_unlock(&dev->list_mutex); | |
1134 | ||
3c52e4e6 DF |
1135 | if (kthread_should_stop()) |
1136 | break; | |
1137 | ||
1138 | /* Only sleep when the search is active. */ | |
9fcbbac5 DF |
1139 | if (dev->search_count) { |
1140 | if (!jremain) | |
1141 | jremain = jtime; | |
1142 | jremain = schedule_timeout(jremain); | |
1143 | } | |
3c52e4e6 DF |
1144 | else |
1145 | schedule(); | |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1149 | |
1150 | return 0; | |
1151 | } | |
1152 | ||
73a98fce | 1153 | static int __init w1_init(void) |
1da177e4 LT |
1154 | { |
1155 | int retval; | |
1156 | ||
1157 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
1158 | ||
12003375 EP |
1159 | w1_init_netlink(); |
1160 | ||
1da177e4 LT |
1161 | retval = bus_register(&w1_bus_type); |
1162 | if (retval) { | |
1163 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
1164 | goto err_out_exit_init; | |
1165 | } | |
1166 | ||
47eba33a GKH |
1167 | retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb); |
1168 | if (retval) | |
1169 | goto err_out_bus_unregister; | |
1170 | ||
7f772ed8 | 1171 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
1172 | if (retval) { |
1173 | printk(KERN_ERR | |
1174 | "Failed to register master driver. err=%d.\n", | |
1175 | retval); | |
1176 | goto err_out_bus_unregister; | |
1177 | } | |
1178 | ||
7f772ed8 EP |
1179 | retval = driver_register(&w1_slave_driver); |
1180 | if (retval) { | |
1181 | printk(KERN_ERR | |
ecf19489 | 1182 | "Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1183 | retval); |
1184 | goto err_out_master_unregister; | |
1185 | } | |
1186 | ||
1da177e4 LT |
1187 | return 0; |
1188 | ||
c30c9b15 DF |
1189 | #if 0 |
1190 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1191 | err_out_slave_unregister: |
1192 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1193 | #endif |
7f772ed8 EP |
1194 | |
1195 | err_out_master_unregister: | |
1196 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1197 | |
1198 | err_out_bus_unregister: | |
1199 | bus_unregister(&w1_bus_type); | |
1200 | ||
1201 | err_out_exit_init: | |
1202 | return retval; | |
1203 | } | |
1204 | ||
73a98fce | 1205 | static void __exit w1_fini(void) |
1da177e4 LT |
1206 | { |
1207 | struct w1_master *dev; | |
1da177e4 | 1208 | |
c30c9b15 | 1209 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1210 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1211 | __w1_remove_master_device(dev); |
1da177e4 | 1212 | |
12003375 EP |
1213 | w1_fini_netlink(); |
1214 | ||
7f772ed8 EP |
1215 | driver_unregister(&w1_slave_driver); |
1216 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1217 | bus_unregister(&w1_bus_type); |
1218 | } | |
1219 | ||
1220 | module_init(w1_init); | |
1221 | module_exit(w1_fini); |