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Commit | Line | Data |
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1da177e4 | 1 | /* |
a8018766 | 2 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
7785925d | 3 | * |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 LT |
13 | */ |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sched.h> | |
674a396c | 26 | #include <linux/kthread.h> |
7dfb7103 | 27 | #include <linux/freezer.h> |
2eb79548 | 28 | #include <linux/hwmon.h> |
1da177e4 | 29 | |
60063497 | 30 | #include <linux/atomic.h> |
1da177e4 | 31 | |
de0d6dbd | 32 | #include "w1_internal.h" |
1da177e4 LT |
33 | #include "w1_netlink.h" |
34 | ||
de0d6dbd AD |
35 | #define W1_FAMILY_DEFAULT 0 |
36 | ||
1da177e4 | 37 | static int w1_timeout = 10; |
1da177e4 | 38 | module_param_named(timeout, w1_timeout, int, 0); |
b3be177a | 39 | MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); |
50fa2951 AD |
40 | |
41 | static int w1_timeout_us = 0; | |
c3098356 | 42 | module_param_named(timeout_us, w1_timeout_us, int, 0); |
a46b195c WY |
43 | MODULE_PARM_DESC(timeout_us, |
44 | "time in microseconds between automatic slave searches"); | |
50fa2951 | 45 | |
b3be177a DF |
46 | /* A search stops when w1_max_slave_count devices have been found in that |
47 | * search. The next search will start over and detect the same set of devices | |
48 | * on a static 1-wire bus. Memory is not allocated based on this number, just | |
49 | * on the number of devices known to the kernel. Having a high number does not | |
50 | * consume additional resources. As a special case, if there is only one | |
51 | * device on the network and w1_max_slave_count is set to 1, the device id can | |
52 | * be read directly skipping the normal slower search process. | |
53 | */ | |
50fa2951 | 54 | int w1_max_slave_count = 64; |
1da177e4 | 55 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
b3be177a DF |
56 | MODULE_PARM_DESC(max_slave_count, |
57 | "maximum number of slaves detected in a search"); | |
50fa2951 AD |
58 | |
59 | int w1_max_slave_ttl = 10; | |
1da177e4 | 60 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
b3be177a DF |
61 | MODULE_PARM_DESC(slave_ttl, |
62 | "Number of searches not seeing a slave before it will be removed"); | |
1da177e4 | 63 | |
abd52a13 | 64 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
65 | LIST_HEAD(w1_masters); |
66 | ||
1da177e4 LT |
67 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
68 | { | |
69 | return 1; | |
70 | } | |
71 | ||
72 | static int w1_master_probe(struct device *dev) | |
73 | { | |
74 | return -ENODEV; | |
75 | } | |
76 | ||
1da177e4 LT |
77 | static void w1_master_release(struct device *dev) |
78 | { | |
db2d0008 | 79 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
80 | |
81 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
82 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
83 | kfree(md); | |
1da177e4 LT |
84 | } |
85 | ||
86 | static void w1_slave_release(struct device *dev) | |
87 | { | |
db2d0008 | 88 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 89 | |
9fcbbac5 | 90 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
3aca692d EP |
91 | |
92 | w1_family_put(sl->family); | |
93 | sl->master->slave_count--; | |
1da177e4 LT |
94 | } |
95 | ||
5b187b3c | 96 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 97 | { |
3aca692d | 98 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 99 | |
3aca692d | 100 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 | 101 | } |
5b187b3c | 102 | static DEVICE_ATTR_RO(name); |
1da177e4 | 103 | |
5b187b3c | 104 | static ssize_t id_show(struct device *dev, |
07e00341 | 105 | struct device_attribute *attr, char *buf) |
1da177e4 | 106 | { |
07e00341 DF |
107 | struct w1_slave *sl = dev_to_w1_slave(dev); |
108 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 109 | |
07e00341 | 110 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 111 | return count; |
3aca692d | 112 | } |
5b187b3c | 113 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 114 | |
5b187b3c GKH |
115 | static struct attribute *w1_slave_attrs[] = { |
116 | &dev_attr_name.attr, | |
117 | &dev_attr_id.attr, | |
118 | NULL, | |
119 | }; | |
120 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 121 | |
d2a4ef6a | 122 | /* Default family */ |
f522d239 | 123 | |
36c27a65 GKH |
124 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
125 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
126 | size_t count) | |
f522d239 EP |
127 | { |
128 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
129 | ||
abd52a13 | 130 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
131 | if (w1_reset_select_slave(sl)) { |
132 | count = 0; | |
133 | goto out_up; | |
134 | } | |
135 | ||
136 | w1_write_block(sl->master, buf, count); | |
137 | ||
138 | out_up: | |
abd52a13 | 139 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
140 | return count; |
141 | } | |
142 | ||
36c27a65 GKH |
143 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
144 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
145 | size_t count) | |
f522d239 EP |
146 | { |
147 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
148 | ||
abd52a13 | 149 | mutex_lock(&sl->master->mutex); |
f522d239 | 150 | w1_read_block(sl->master, buf, count); |
abd52a13 | 151 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
152 | return count; |
153 | } | |
154 | ||
36c27a65 GKH |
155 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
156 | ||
157 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
158 | &bin_attr_rw, | |
159 | NULL, | |
f522d239 EP |
160 | }; |
161 | ||
36c27a65 GKH |
162 | static const struct attribute_group w1_slave_default_group = { |
163 | .bin_attrs = w1_slave_bin_attrs, | |
164 | }; | |
f522d239 | 165 | |
36c27a65 GKH |
166 | static const struct attribute_group *w1_slave_default_groups[] = { |
167 | &w1_slave_default_group, | |
168 | NULL, | |
169 | }; | |
f522d239 EP |
170 | |
171 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 172 | .groups = w1_slave_default_groups, |
f522d239 EP |
173 | }; |
174 | ||
175 | static struct w1_family w1_default_family = { | |
176 | .fops = &w1_default_fops, | |
177 | }; | |
d2a4ef6a | 178 | |
7eff2e7a | 179 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 180 | |
1da177e4 LT |
181 | static struct bus_type w1_bus_type = { |
182 | .name = "w1", | |
183 | .match = w1_master_match, | |
312c004d | 184 | .uevent = w1_uevent, |
1da177e4 LT |
185 | }; |
186 | ||
7f772ed8 EP |
187 | struct device_driver w1_master_driver = { |
188 | .name = "w1_master_driver", | |
1da177e4 LT |
189 | .bus = &w1_bus_type, |
190 | .probe = w1_master_probe, | |
1da177e4 LT |
191 | }; |
192 | ||
7f772ed8 | 193 | struct device w1_master_device = { |
1da177e4 LT |
194 | .parent = NULL, |
195 | .bus = &w1_bus_type, | |
40f91de6 | 196 | .init_name = "w1 bus master", |
7f772ed8 | 197 | .driver = &w1_master_driver, |
1da177e4 LT |
198 | .release = &w1_master_release |
199 | }; | |
200 | ||
2c5bfdac | 201 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
202 | .name = "w1_slave_driver", |
203 | .bus = &w1_bus_type, | |
204 | }; | |
205 | ||
2c5bfdac | 206 | #if 0 |
7f772ed8 EP |
207 | struct device w1_slave_device = { |
208 | .parent = NULL, | |
209 | .bus = &w1_bus_type, | |
40f91de6 | 210 | .init_name = "w1 bus slave", |
7f772ed8 | 211 | .driver = &w1_slave_driver, |
3aca692d | 212 | .release = &w1_slave_release |
7f772ed8 | 213 | }; |
2c5bfdac | 214 | #endif /* 0 */ |
7f772ed8 | 215 | |
060b8845 | 216 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 217 | { |
db2d0008 | 218 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 219 | ssize_t count; |
7785925d | 220 | |
abd52a13 | 221 | mutex_lock(&md->mutex); |
1da177e4 | 222 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 223 | mutex_unlock(&md->mutex); |
1da177e4 LT |
224 | |
225 | return count; | |
226 | } | |
227 | ||
2a9d0c17 EP |
228 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
229 | struct device_attribute *attr, | |
230 | const char * buf, size_t count) | |
231 | { | |
6a158c0d | 232 | long tmp; |
db2d0008 | 233 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 234 | int ret; |
2a9d0c17 | 235 | |
bf4228f0 JH |
236 | ret = kstrtol(buf, 0, &tmp); |
237 | if (ret) | |
238 | return ret; | |
6a158c0d | 239 | |
abd52a13 | 240 | mutex_lock(&md->mutex); |
6a158c0d | 241 | md->search_count = tmp; |
abd52a13 | 242 | mutex_unlock(&md->mutex); |
af8c7237 DF |
243 | /* Only wake if it is going to be searching. */ |
244 | if (tmp) | |
245 | wake_up_process(md->thread); | |
2a9d0c17 EP |
246 | |
247 | return count; | |
248 | } | |
249 | ||
250 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
251 | struct device_attribute *attr, | |
252 | char *buf) | |
253 | { | |
db2d0008 | 254 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
255 | ssize_t count; |
256 | ||
abd52a13 | 257 | mutex_lock(&md->mutex); |
2a9d0c17 | 258 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 259 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
260 | |
261 | return count; | |
262 | } | |
263 | ||
6a158c0d DF |
264 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
265 | struct device_attribute *attr, | |
266 | const char *buf, size_t count) | |
267 | { | |
268 | long tmp; | |
269 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 270 | int ret; |
6a158c0d | 271 | |
bf4228f0 JH |
272 | ret = kstrtol(buf, 0, &tmp); |
273 | if (ret) | |
274 | return ret; | |
6a158c0d DF |
275 | |
276 | mutex_lock(&md->mutex); | |
277 | md->enable_pullup = tmp; | |
278 | mutex_unlock(&md->mutex); | |
6a158c0d DF |
279 | |
280 | return count; | |
281 | } | |
282 | ||
283 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
284 | struct device_attribute *attr, | |
285 | char *buf) | |
286 | { | |
287 | struct w1_master *md = dev_to_w1_master(dev); | |
288 | ssize_t count; | |
289 | ||
290 | mutex_lock(&md->mutex); | |
291 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
292 | mutex_unlock(&md->mutex); | |
293 | ||
294 | return count; | |
295 | } | |
296 | ||
060b8845 | 297 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 298 | { |
db2d0008 | 299 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 300 | ssize_t count; |
7785925d | 301 | |
abd52a13 | 302 | mutex_lock(&md->mutex); |
1da177e4 | 303 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 304 | mutex_unlock(&md->mutex); |
1da177e4 LT |
305 | return count; |
306 | } | |
307 | ||
060b8845 | 308 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
309 | { |
310 | ssize_t count; | |
311 | count = sprintf(buf, "%d\n", w1_timeout); | |
312 | return count; | |
313 | } | |
314 | ||
c3098356 DK |
315 | static ssize_t w1_master_attribute_show_timeout_us(struct device *dev, |
316 | struct device_attribute *attr, char *buf) | |
317 | { | |
318 | ssize_t count; | |
319 | count = sprintf(buf, "%d\n", w1_timeout_us); | |
320 | return count; | |
321 | } | |
322 | ||
a1613056 DF |
323 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
324 | struct device_attribute *attr, const char *buf, size_t count) | |
325 | { | |
a7155f4e | 326 | int tmp; |
a1613056 DF |
327 | struct w1_master *md = dev_to_w1_master(dev); |
328 | ||
b9c11a23 | 329 | if (kstrtoint(buf, 0, &tmp) || tmp < 1) |
a1613056 DF |
330 | return -EINVAL; |
331 | ||
332 | mutex_lock(&md->mutex); | |
333 | md->max_slave_count = tmp; | |
334 | /* allow each time the max_slave_count is updated */ | |
335 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
336 | mutex_unlock(&md->mutex); | |
337 | ||
338 | return count; | |
339 | } | |
340 | ||
060b8845 | 341 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 342 | { |
db2d0008 | 343 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 344 | ssize_t count; |
7785925d | 345 | |
abd52a13 | 346 | mutex_lock(&md->mutex); |
1da177e4 | 347 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 348 | mutex_unlock(&md->mutex); |
1da177e4 LT |
349 | return count; |
350 | } | |
351 | ||
060b8845 | 352 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 353 | { |
db2d0008 | 354 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 355 | ssize_t count; |
7785925d | 356 | |
abd52a13 | 357 | mutex_lock(&md->mutex); |
1da177e4 | 358 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 359 | mutex_unlock(&md->mutex); |
1da177e4 LT |
360 | return count; |
361 | } | |
362 | ||
060b8845 | 363 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 364 | { |
db2d0008 | 365 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 366 | ssize_t count; |
7785925d | 367 | |
abd52a13 | 368 | mutex_lock(&md->mutex); |
1da177e4 | 369 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 370 | mutex_unlock(&md->mutex); |
1da177e4 LT |
371 | return count; |
372 | } | |
373 | ||
9b467411 DF |
374 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
375 | struct device_attribute *attr, char *buf) | |
1da177e4 | 376 | { |
db2d0008 | 377 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 378 | int c = PAGE_SIZE; |
9fcbbac5 DF |
379 | struct list_head *ent, *n; |
380 | struct w1_slave *sl = NULL; | |
1da177e4 | 381 | |
9fcbbac5 | 382 | mutex_lock(&md->list_mutex); |
1da177e4 | 383 | |
9fcbbac5 DF |
384 | list_for_each_safe(ent, n, &md->slist) { |
385 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
1da177e4 | 386 | |
9fcbbac5 | 387 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 | 388 | } |
9fcbbac5 DF |
389 | if (!sl) |
390 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
1da177e4 | 391 | |
9fcbbac5 | 392 | mutex_unlock(&md->list_mutex); |
1da177e4 LT |
393 | |
394 | return PAGE_SIZE - c; | |
395 | } | |
396 | ||
9b467411 DF |
397 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
399 | { | |
400 | int c = PAGE_SIZE; | |
401 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
402 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
403 | return PAGE_SIZE - c; | |
404 | } | |
405 | ||
406 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
407 | struct w1_reg_num *rn) | |
408 | { | |
409 | unsigned int family; | |
410 | unsigned long long id; | |
411 | int i; | |
412 | u64 rn64_le; | |
413 | ||
414 | /* The CRC value isn't read from the user because the sysfs directory | |
415 | * doesn't include it and most messages from the bus search don't | |
416 | * print it either. It would be unreasonable for the user to then | |
417 | * provide it. | |
418 | */ | |
419 | const char *error_msg = "bad slave string format, expecting " | |
420 | "ff-dddddddddddd\n"; | |
421 | ||
422 | if (buf[2] != '-') { | |
423 | dev_err(dev, "%s", error_msg); | |
424 | return -EINVAL; | |
425 | } | |
426 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
427 | if (i != 2) { | |
428 | dev_err(dev, "%s", error_msg); | |
429 | return -EINVAL; | |
430 | } | |
431 | rn->family = family; | |
432 | rn->id = id; | |
433 | ||
434 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
435 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
436 | ||
437 | #if 0 | |
438 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
439 | rn->family, (unsigned long long)rn->id, rn->crc); | |
440 | #endif | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
9fcbbac5 | 446 | * Note: must not hold list_mutex |
9b467411 | 447 | */ |
70b34d2e | 448 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
9b467411 DF |
449 | struct w1_reg_num *rn) |
450 | { | |
451 | struct w1_slave *sl; | |
9fcbbac5 | 452 | mutex_lock(&dev->list_mutex); |
9b467411 DF |
453 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
454 | if (sl->reg_num.family == rn->family && | |
455 | sl->reg_num.id == rn->id && | |
456 | sl->reg_num.crc == rn->crc) { | |
9fcbbac5 | 457 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
458 | return sl; |
459 | } | |
460 | } | |
9fcbbac5 | 461 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
462 | return NULL; |
463 | } | |
464 | ||
465 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
466 | struct device_attribute *attr, | |
467 | const char *buf, size_t count) | |
468 | { | |
469 | struct w1_master *md = dev_to_w1_master(dev); | |
470 | struct w1_reg_num rn; | |
471 | struct w1_slave *sl; | |
472 | ssize_t result = count; | |
473 | ||
474 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
475 | return -EINVAL; | |
476 | ||
477 | mutex_lock(&md->mutex); | |
478 | sl = w1_slave_search_device(md, &rn); | |
479 | /* It would be nice to do a targeted search one the one-wire bus | |
480 | * for the new device to see if it is out there or not. But the | |
481 | * current search doesn't support that. | |
482 | */ | |
483 | if (sl) { | |
484 | dev_info(dev, "Device %s already exists\n", sl->name); | |
485 | result = -EINVAL; | |
486 | } else { | |
487 | w1_attach_slave_device(md, &rn); | |
488 | } | |
489 | mutex_unlock(&md->mutex); | |
490 | ||
491 | return result; | |
492 | } | |
493 | ||
494 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
495 | struct device_attribute *attr, char *buf) | |
496 | { | |
497 | int c = PAGE_SIZE; | |
498 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
499 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
500 | return PAGE_SIZE - c; | |
501 | } | |
502 | ||
503 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
504 | struct device_attribute *attr, | |
505 | const char *buf, size_t count) | |
506 | { | |
507 | struct w1_master *md = dev_to_w1_master(dev); | |
508 | struct w1_reg_num rn; | |
509 | struct w1_slave *sl; | |
510 | ssize_t result = count; | |
511 | ||
512 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
513 | return -EINVAL; | |
514 | ||
515 | mutex_lock(&md->mutex); | |
516 | sl = w1_slave_search_device(md, &rn); | |
517 | if (sl) { | |
9fcbbac5 DF |
518 | result = w1_slave_detach(sl); |
519 | /* refcnt 0 means it was detached in the call */ | |
520 | if (result == 0) | |
521 | result = count; | |
9b467411 DF |
522 | } else { |
523 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
524 | (unsigned long long)rn.id); | |
525 | result = -EINVAL; | |
526 | } | |
527 | mutex_unlock(&md->mutex); | |
528 | ||
529 | return result; | |
530 | } | |
531 | ||
7785925d EP |
532 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
533 | struct device_attribute w1_master_attribute_##_name = \ | |
534 | __ATTR(w1_master_##_name, _mode, \ | |
535 | w1_master_attribute_show_##_name, NULL) | |
536 | ||
2a9d0c17 EP |
537 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
538 | struct device_attribute w1_master_attribute_##_name = \ | |
539 | __ATTR(w1_master_##_name, _mode, \ | |
540 | w1_master_attribute_show_##_name, \ | |
541 | w1_master_attribute_store_##_name) | |
542 | ||
7785925d EP |
543 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
544 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
545 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 546 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
547 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
548 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
c3098356 | 549 | static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO); |
7785925d | 550 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
12aa4c64 BS |
551 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
552 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
553 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
554 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
555 | |
556 | static struct attribute *w1_master_default_attrs[] = { | |
557 | &w1_master_attribute_name.attr, | |
558 | &w1_master_attribute_slaves.attr, | |
559 | &w1_master_attribute_slave_count.attr, | |
560 | &w1_master_attribute_max_slave_count.attr, | |
561 | &w1_master_attribute_attempts.attr, | |
562 | &w1_master_attribute_timeout.attr, | |
c3098356 | 563 | &w1_master_attribute_timeout_us.attr, |
7785925d | 564 | &w1_master_attribute_pointer.attr, |
2a9d0c17 | 565 | &w1_master_attribute_search.attr, |
6a158c0d | 566 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
567 | &w1_master_attribute_add.attr, |
568 | &w1_master_attribute_remove.attr, | |
7785925d | 569 | NULL |
1da177e4 LT |
570 | }; |
571 | ||
a890d56a | 572 | static const struct attribute_group w1_master_defattr_group = { |
7785925d | 573 | .attrs = w1_master_default_attrs, |
1da177e4 LT |
574 | }; |
575 | ||
7785925d EP |
576 | int w1_create_master_attributes(struct w1_master *master) |
577 | { | |
578 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
579 | } | |
580 | ||
c30c9b15 | 581 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
582 | { |
583 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
584 | } | |
585 | ||
7eff2e7a | 586 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
587 | { |
588 | struct w1_master *md = NULL; | |
589 | struct w1_slave *sl = NULL; | |
590 | char *event_owner, *name; | |
526be416 | 591 | int err = 0; |
7f772ed8 EP |
592 | |
593 | if (dev->driver == &w1_master_driver) { | |
594 | md = container_of(dev, struct w1_master, dev); | |
595 | event_owner = "master"; | |
596 | name = md->name; | |
597 | } else if (dev->driver == &w1_slave_driver) { | |
598 | sl = container_of(dev, struct w1_slave, dev); | |
599 | event_owner = "slave"; | |
600 | name = sl->name; | |
601 | } else { | |
312c004d | 602 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
603 | return -EINVAL; |
604 | } | |
605 | ||
c6976a4e | 606 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 607 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
608 | |
609 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 610 | goto end; |
7f772ed8 | 611 | |
7eff2e7a | 612 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 613 | if (err) |
526be416 | 614 | goto end; |
7f772ed8 | 615 | |
7eff2e7a KS |
616 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
617 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
618 | end: |
619 | return err; | |
620 | } | |
7f772ed8 | 621 | |
18d7f891 | 622 | static int w1_family_notify(unsigned long action, struct w1_slave *sl) |
47eba33a | 623 | { |
36c27a65 | 624 | struct w1_family_ops *fops; |
47eba33a GKH |
625 | int err; |
626 | ||
36c27a65 | 627 | fops = sl->family->fops; |
47eba33a | 628 | |
2962aece HFV |
629 | if (!fops) |
630 | return 0; | |
631 | ||
47eba33a GKH |
632 | switch (action) { |
633 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 634 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
635 | if (fops->add_slave) { |
636 | err = fops->add_slave(sl); | |
637 | if (err < 0) { | |
638 | dev_err(&sl->dev, | |
639 | "add_slave() call failed. err=%d\n", | |
640 | err); | |
641 | return err; | |
642 | } | |
643 | } | |
644 | if (fops->groups) { | |
645 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
646 | if (err) { | |
647 | dev_err(&sl->dev, | |
648 | "sysfs group creation failed. err=%d\n", | |
649 | err); | |
650 | return err; | |
651 | } | |
47eba33a | 652 | } |
2eb79548 JRN |
653 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info) { |
654 | struct device *hwmon | |
655 | = hwmon_device_register_with_info(&sl->dev, | |
656 | "w1_slave_temp", sl, | |
657 | fops->chip_info, | |
658 | NULL); | |
659 | if (IS_ERR(hwmon)) { | |
660 | dev_warn(&sl->dev, | |
661 | "could not create hwmon device\n"); | |
662 | } else { | |
663 | sl->hwmon = hwmon; | |
664 | } | |
665 | } | |
47eba33a GKH |
666 | break; |
667 | case BUS_NOTIFY_DEL_DEVICE: | |
2eb79548 JRN |
668 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info && |
669 | sl->hwmon) | |
670 | hwmon_device_unregister(sl->hwmon); | |
36c27a65 | 671 | if (fops->remove_slave) |
47eba33a | 672 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
673 | if (fops->groups) |
674 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
675 | break; |
676 | } | |
677 | return 0; | |
678 | } | |
679 | ||
1da177e4 LT |
680 | static int __w1_attach_slave_device(struct w1_slave *sl) |
681 | { | |
682 | int err; | |
683 | ||
684 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 685 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
686 | sl->dev.bus = &w1_bus_type; |
687 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 688 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 689 | |
40f91de6 | 690 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
691 | (unsigned int) sl->reg_num.family, |
692 | (unsigned long long) sl->reg_num.id); | |
693 | snprintf(&sl->name[0], sizeof(sl->name), | |
694 | "%02x-%012llx", | |
695 | (unsigned int) sl->reg_num.family, | |
696 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 697 | |
c6976a4e | 698 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 699 | dev_name(&sl->dev), sl); |
1da177e4 | 700 | |
18d7f891 DF |
701 | /* suppress for w1_family_notify before sending KOBJ_ADD */ |
702 | dev_set_uevent_suppress(&sl->dev, true); | |
703 | ||
1da177e4 LT |
704 | err = device_register(&sl->dev); |
705 | if (err < 0) { | |
706 | dev_err(&sl->dev, | |
6b729861 | 707 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 708 | dev_name(&sl->dev), err); |
1da177e4 LT |
709 | return err; |
710 | } | |
18d7f891 | 711 | w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl); |
1da177e4 | 712 | |
47eba33a GKH |
713 | dev_set_uevent_suppress(&sl->dev, false); |
714 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 | 715 | |
9fcbbac5 | 716 | mutex_lock(&sl->master->list_mutex); |
1da177e4 | 717 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
9fcbbac5 | 718 | mutex_unlock(&sl->master->list_mutex); |
1da177e4 LT |
719 | |
720 | return 0; | |
721 | } | |
722 | ||
70b34d2e | 723 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
1da177e4 LT |
724 | { |
725 | struct w1_slave *sl; | |
726 | struct w1_family *f; | |
727 | int err; | |
728 | struct w1_netlink_msg msg; | |
729 | ||
dd00cc48 | 730 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
731 | if (!sl) { |
732 | dev_err(&dev->dev, | |
733 | "%s: failed to allocate new slave device.\n", | |
734 | __func__); | |
735 | return -ENOMEM; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | |
739 | sl->owner = THIS_MODULE; | |
740 | sl->master = dev; | |
bb670937 | 741 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 742 | |
12003375 | 743 | memset(&msg, 0, sizeof(msg)); |
1da177e4 | 744 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
9fcbbac5 DF |
745 | atomic_set(&sl->refcnt, 1); |
746 | atomic_inc(&sl->master->refcnt); | |
2c927c0c | 747 | dev->slave_count++; |
f6887531 AW |
748 | dev_info(&dev->dev, "Attaching one wire slave %02x.%012llx crc %02x\n", |
749 | rn->family, (unsigned long long)rn->id, rn->crc); | |
1da177e4 | 750 | |
bc04d76d HFV |
751 | /* slave modules need to be loaded in a context with unlocked mutex */ |
752 | mutex_unlock(&dev->mutex); | |
4b7e4f82 | 753 | request_module("w1-family-0x%02x", rn->family); |
bc04d76d | 754 | mutex_lock(&dev->mutex); |
8d7bda51 | 755 | |
1da177e4 LT |
756 | spin_lock(&w1_flock); |
757 | f = w1_family_registered(rn->family); | |
758 | if (!f) { | |
99c5bfe9 | 759 | f= &w1_default_family; |
1da177e4 LT |
760 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
761 | rn->family, rn->family, | |
762 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
763 | } |
764 | __w1_family_get(f); | |
765 | spin_unlock(&w1_flock); | |
766 | ||
767 | sl->family = f; | |
768 | ||
1da177e4 LT |
769 | err = __w1_attach_slave_device(sl); |
770 | if (err < 0) { | |
771 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
772 | sl->name); | |
2c927c0c | 773 | dev->slave_count--; |
1da177e4 | 774 | w1_family_put(sl->family); |
d2ce4ea1 | 775 | atomic_dec(&sl->master->refcnt); |
1da177e4 LT |
776 | kfree(sl); |
777 | return err; | |
778 | } | |
779 | ||
780 | sl->ttl = dev->slave_ttl; | |
1da177e4 | 781 | |
12003375 | 782 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
783 | msg.type = W1_SLAVE_ADD; |
784 | w1_netlink_send(dev, &msg); | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
9fcbbac5 | 789 | int w1_unref_slave(struct w1_slave *sl) |
1da177e4 | 790 | { |
9fcbbac5 DF |
791 | struct w1_master *dev = sl->master; |
792 | int refcnt; | |
793 | mutex_lock(&dev->list_mutex); | |
794 | refcnt = atomic_sub_return(1, &sl->refcnt); | |
795 | if (refcnt == 0) { | |
796 | struct w1_netlink_msg msg; | |
797 | ||
798 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, | |
799 | sl->name, sl); | |
800 | ||
801 | list_del(&sl->w1_slave_entry); | |
802 | ||
803 | memset(&msg, 0, sizeof(msg)); | |
804 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
805 | msg.type = W1_SLAVE_REMOVE; | |
806 | w1_netlink_send(sl->master, &msg); | |
807 | ||
18d7f891 | 808 | w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl); |
9fcbbac5 DF |
809 | device_unregister(&sl->dev); |
810 | #ifdef DEBUG | |
811 | memset(sl, 0, sizeof(*sl)); | |
812 | #endif | |
813 | kfree(sl); | |
814 | } | |
815 | atomic_dec(&dev->refcnt); | |
816 | mutex_unlock(&dev->list_mutex); | |
817 | return refcnt; | |
818 | } | |
1da177e4 | 819 | |
9fcbbac5 DF |
820 | int w1_slave_detach(struct w1_slave *sl) |
821 | { | |
822 | /* Only detach a slave once as it decreases the refcnt each time. */ | |
823 | int destroy_now; | |
824 | mutex_lock(&sl->master->list_mutex); | |
825 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); | |
826 | set_bit(W1_SLAVE_DETACH, &sl->flags); | |
827 | mutex_unlock(&sl->master->list_mutex); | |
828 | ||
829 | if (destroy_now) | |
830 | destroy_now = !w1_unref_slave(sl); | |
831 | return destroy_now ? 0 : -EBUSY; | |
1da177e4 LT |
832 | } |
833 | ||
12003375 EP |
834 | struct w1_master *w1_search_master_id(u32 id) |
835 | { | |
836 | struct w1_master *dev; | |
837 | int found = 0; | |
838 | ||
abd52a13 | 839 | mutex_lock(&w1_mlock); |
12003375 EP |
840 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
841 | if (dev->id == id) { | |
842 | found = 1; | |
843 | atomic_inc(&dev->refcnt); | |
844 | break; | |
845 | } | |
846 | } | |
abd52a13 | 847 | mutex_unlock(&w1_mlock); |
12003375 EP |
848 | |
849 | return (found)?dev:NULL; | |
850 | } | |
851 | ||
852 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
853 | { | |
854 | struct w1_master *dev; | |
855 | struct w1_slave *sl = NULL; | |
856 | int found = 0; | |
857 | ||
abd52a13 | 858 | mutex_lock(&w1_mlock); |
12003375 | 859 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
9fcbbac5 | 860 | mutex_lock(&dev->list_mutex); |
12003375 EP |
861 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
862 | if (sl->reg_num.family == id->family && | |
863 | sl->reg_num.id == id->id && | |
864 | sl->reg_num.crc == id->crc) { | |
865 | found = 1; | |
866 | atomic_inc(&dev->refcnt); | |
867 | atomic_inc(&sl->refcnt); | |
868 | break; | |
869 | } | |
870 | } | |
9fcbbac5 | 871 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
872 | |
873 | if (found) | |
874 | break; | |
875 | } | |
abd52a13 | 876 | mutex_unlock(&w1_mlock); |
12003375 EP |
877 | |
878 | return (found)?sl:NULL; | |
879 | } | |
880 | ||
c30c9b15 | 881 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 882 | { |
c30c9b15 | 883 | struct w1_slave *sl, *sln; |
6adf87bd EP |
884 | struct w1_master *dev; |
885 | ||
abd52a13 | 886 | mutex_lock(&w1_mlock); |
6adf87bd | 887 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
888 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
889 | "for family %02x.\n", dev->name, f->fid); | |
890 | mutex_lock(&dev->mutex); | |
9fcbbac5 | 891 | mutex_lock(&dev->list_mutex); |
c30c9b15 DF |
892 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
893 | /* If it is a new family, slaves with the default | |
894 | * family driver and are that family will be | |
895 | * connected. If the family is going away, devices | |
896 | * matching that family are reconneced. | |
897 | */ | |
898 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
899 | && sl->reg_num.family == f->fid) || | |
900 | (!attach && sl->family->fid == f->fid)) { | |
901 | struct w1_reg_num rn; | |
902 | ||
9fcbbac5 | 903 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 904 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
9fcbbac5 DF |
905 | /* If it was already in use let the automatic |
906 | * scan pick it up again later. | |
907 | */ | |
908 | if (!w1_slave_detach(sl)) | |
909 | w1_attach_slave_device(dev, &rn); | |
910 | mutex_lock(&dev->list_mutex); | |
c30c9b15 DF |
911 | } |
912 | } | |
913 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
914 | "has been finished.\n", dev->name); | |
9fcbbac5 | 915 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 916 | mutex_unlock(&dev->mutex); |
6adf87bd | 917 | } |
abd52a13 | 918 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
919 | } |
920 | ||
963bb101 | 921 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 922 | { |
1da177e4 | 923 | struct w1_slave *sl; |
1da177e4 | 924 | struct w1_reg_num *tmp; |
0e65f828 | 925 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 926 | |
c30c9b15 | 927 | atomic_inc(&dev->refcnt); |
7785925d | 928 | |
1da177e4 LT |
929 | tmp = (struct w1_reg_num *) &rn; |
930 | ||
cd7b28d3 DF |
931 | sl = w1_slave_search_device(dev, tmp); |
932 | if (sl) { | |
bb670937 | 933 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
934 | } else { |
935 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
936 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 937 | } |
7785925d | 938 | |
1da177e4 LT |
939 | atomic_dec(&dev->refcnt); |
940 | } | |
941 | ||
6b729861 | 942 | /** |
b3be177a DF |
943 | * w1_search() - Performs a ROM Search & registers any devices found. |
944 | * @dev: The master device to search | |
945 | * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH | |
946 | * to return only devices in the alarmed state | |
947 | * @cb: Function to call when a device is found | |
948 | * | |
6b729861 EP |
949 | * The 1-wire search is a simple binary tree search. |
950 | * For each bit of the address, we read two bits and write one bit. | |
951 | * The bit written will put to sleep all devies that don't match that bit. | |
952 | * When the two reads differ, the direction choice is obvious. | |
953 | * When both bits are 0, we must choose a path to take. | |
954 | * When we can scan all 64 bits without having to choose a path, we are done. | |
955 | * | |
956 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
957 | * | |
6b729861 | 958 | */ |
12003375 | 959 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 960 | { |
6b729861 EP |
961 | u64 last_rn, rn, tmp64; |
962 | int i, slave_count = 0; | |
963 | int last_zero, last_device; | |
964 | int search_bit, desc_bit; | |
965 | u8 triplet_ret = 0; | |
1da177e4 | 966 | |
6b729861 | 967 | search_bit = 0; |
3c6955e5 DF |
968 | rn = dev->search_id; |
969 | last_rn = 0; | |
6b729861 EP |
970 | last_device = 0; |
971 | last_zero = -1; | |
1da177e4 LT |
972 | |
973 | desc_bit = 64; | |
974 | ||
6b729861 EP |
975 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
976 | last_rn = rn; | |
1da177e4 LT |
977 | rn = 0; |
978 | ||
1da177e4 LT |
979 | /* |
980 | * Reset bus and all 1-wire device state machines | |
981 | * so they can respond to our requests. | |
982 | * | |
983 | * Return 0 - device(s) present, 1 - no devices present. | |
984 | */ | |
b02f8bed | 985 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 986 | if (w1_reset_bus(dev)) { |
b02f8bed | 987 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 988 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
989 | break; |
990 | } | |
991 | ||
c9cbf558 EP |
992 | /* Do fast search on single slave bus */ |
993 | if (dev->max_slave_count == 1) { | |
b02f8bed | 994 | int rv; |
c9cbf558 | 995 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
996 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
997 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 998 | |
b02f8bed | 999 | if (rv == 8 && rn) |
c9cbf558 EP |
1000 | cb(dev, rn); |
1001 | ||
1002 | break; | |
1003 | } | |
1004 | ||
6b729861 | 1005 | /* Start the search */ |
12003375 | 1006 | w1_write_8(dev, search_type); |
1da177e4 | 1007 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
1008 | /* Determine the direction/search bit */ |
1009 | if (i == desc_bit) | |
1010 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
1011 | else if (i > desc_bit) | |
1012 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 1013 | else |
6b729861 | 1014 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 1015 | |
b3be177a | 1016 | /* Read two bits and write one bit */ |
6b729861 EP |
1017 | triplet_ret = w1_triplet(dev, search_bit); |
1018 | ||
1019 | /* quit if no device responded */ | |
1020 | if ( (triplet_ret & 0x03) == 0x03 ) | |
1021 | break; | |
1da177e4 | 1022 | |
6b729861 EP |
1023 | /* If both directions were valid, and we took the 0 path... */ |
1024 | if (triplet_ret == 0) | |
1025 | last_zero = i; | |
1da177e4 | 1026 | |
6b729861 EP |
1027 | /* extract the direction taken & update the device number */ |
1028 | tmp64 = (triplet_ret >> 2); | |
1029 | rn |= (tmp64 << i); | |
0d671b27 | 1030 | |
42105698 | 1031 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 1032 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 1033 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
1034 | return; |
1035 | } | |
6b729861 | 1036 | } |
b02f8bed | 1037 | mutex_unlock(&dev->bus_mutex); |
7785925d | 1038 | |
6b729861 | 1039 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 1040 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 1041 | last_device = 1; |
3c6955e5 DF |
1042 | dev->search_id = 0; |
1043 | } else { | |
1044 | dev->search_id = rn; | |
1045 | } | |
6b729861 | 1046 | desc_bit = last_zero; |
c30c9b15 | 1047 | cb(dev, rn); |
6b729861 | 1048 | } |
a1613056 DF |
1049 | |
1050 | if (!last_device && slave_count == dev->max_slave_count && | |
1051 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1052 | /* Only max_slave_count will be scanned in a search, |
1053 | * but it will start where it left off next search | |
1054 | * until all ids are identified and then it will start | |
1055 | * over. A continued search will report the previous | |
1056 | * last id as the first id (provided it is still on the | |
1057 | * bus). | |
1058 | */ | |
a1613056 | 1059 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1060 | "will continue next search.\n", __func__, |
a1613056 DF |
1061 | dev->max_slave_count); |
1062 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1063 | } | |
1da177e4 LT |
1064 | } |
1065 | } | |
1066 | ||
963bb101 DF |
1067 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1068 | w1_slave_found_callback cb) | |
12003375 EP |
1069 | { |
1070 | struct w1_slave *sl, *sln; | |
1071 | ||
9fcbbac5 | 1072 | mutex_lock(&dev->list_mutex); |
12003375 | 1073 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
bb670937 | 1074 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
9fcbbac5 | 1075 | mutex_unlock(&dev->list_mutex); |
12003375 | 1076 | |
963bb101 | 1077 | w1_search_devices(dev, search_type, cb); |
12003375 | 1078 | |
9fcbbac5 | 1079 | mutex_lock(&dev->list_mutex); |
12003375 | 1080 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
9fcbbac5 DF |
1081 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
1082 | mutex_unlock(&dev->list_mutex); | |
12003375 | 1083 | w1_slave_detach(sl); |
9fcbbac5 DF |
1084 | mutex_lock(&dev->list_mutex); |
1085 | } | |
bb670937 | 1086 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1087 | sl->ttl = dev->slave_ttl; |
1088 | } | |
9fcbbac5 | 1089 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
1090 | |
1091 | if (dev->search_count > 0) | |
1092 | dev->search_count--; | |
1093 | } | |
1094 | ||
963bb101 DF |
1095 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1096 | { | |
1097 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1098 | } | |
1099 | ||
b3be177a DF |
1100 | /** |
1101 | * w1_process_callbacks() - execute each dev->async_list callback entry | |
1102 | * @dev: w1_master device | |
1103 | * | |
a0f10464 AK |
1104 | * The w1 master list_mutex must be held. |
1105 | * | |
b3be177a DF |
1106 | * Return: 1 if there were commands to executed 0 otherwise |
1107 | */ | |
9fcbbac5 DF |
1108 | int w1_process_callbacks(struct w1_master *dev) |
1109 | { | |
1110 | int ret = 0; | |
1111 | struct w1_async_cmd *async_cmd, *async_n; | |
1112 | ||
1113 | /* The list can be added to in another thread, loop until it is empty */ | |
1114 | while (!list_empty(&dev->async_list)) { | |
1115 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, | |
1116 | async_entry) { | |
1117 | /* drop the lock, if it is a search it can take a long | |
1118 | * time */ | |
1119 | mutex_unlock(&dev->list_mutex); | |
1120 | async_cmd->cb(dev, async_cmd); | |
1121 | ret = 1; | |
1122 | mutex_lock(&dev->list_mutex); | |
1123 | } | |
1124 | } | |
1125 | return ret; | |
1126 | } | |
1127 | ||
1da177e4 LT |
1128 | int w1_process(void *data) |
1129 | { | |
1130 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1131 | /* As long as w1_timeout is only set by a module parameter the sleep |
1132 | * time can be calculated in jiffies once. | |
1133 | */ | |
c3098356 DK |
1134 | const unsigned long jtime = |
1135 | usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us); | |
9fcbbac5 DF |
1136 | /* remainder if it woke up early */ |
1137 | unsigned long jremain = 0; | |
1da177e4 | 1138 | |
9fcbbac5 DF |
1139 | for (;;) { |
1140 | ||
1141 | if (!jremain && dev->search_count) { | |
01e14d6d DF |
1142 | mutex_lock(&dev->mutex); |
1143 | w1_search_process(dev, W1_SEARCH); | |
1144 | mutex_unlock(&dev->mutex); | |
1145 | } | |
1146 | ||
9fcbbac5 DF |
1147 | mutex_lock(&dev->list_mutex); |
1148 | /* Note, w1_process_callback drops the lock while processing, | |
1149 | * but locks it again before returning. | |
1150 | */ | |
1151 | if (!w1_process_callbacks(dev) && jremain) { | |
1152 | /* a wake up is either to stop the thread, process | |
1153 | * callbacks, or search, it isn't process callbacks, so | |
1154 | * schedule a search. | |
1155 | */ | |
1156 | jremain = 1; | |
1157 | } | |
1158 | ||
3c52e4e6 DF |
1159 | __set_current_state(TASK_INTERRUPTIBLE); |
1160 | ||
9fcbbac5 DF |
1161 | /* hold list_mutex until after interruptible to prevent loosing |
1162 | * the wakeup signal when async_cmd is added. | |
1163 | */ | |
1164 | mutex_unlock(&dev->list_mutex); | |
1165 | ||
3c52e4e6 DF |
1166 | if (kthread_should_stop()) |
1167 | break; | |
1168 | ||
1169 | /* Only sleep when the search is active. */ | |
9fcbbac5 DF |
1170 | if (dev->search_count) { |
1171 | if (!jremain) | |
1172 | jremain = jtime; | |
1173 | jremain = schedule_timeout(jremain); | |
1174 | } | |
3c52e4e6 DF |
1175 | else |
1176 | schedule(); | |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1180 | |
1181 | return 0; | |
1182 | } | |
1183 | ||
73a98fce | 1184 | static int __init w1_init(void) |
1da177e4 LT |
1185 | { |
1186 | int retval; | |
1187 | ||
fdc9167a | 1188 | pr_info("Driver for 1-wire Dallas network protocol.\n"); |
1da177e4 | 1189 | |
12003375 EP |
1190 | w1_init_netlink(); |
1191 | ||
1da177e4 LT |
1192 | retval = bus_register(&w1_bus_type); |
1193 | if (retval) { | |
fdc9167a | 1194 | pr_err("Failed to register bus. err=%d.\n", retval); |
1da177e4 LT |
1195 | goto err_out_exit_init; |
1196 | } | |
1197 | ||
7f772ed8 | 1198 | retval = driver_register(&w1_master_driver); |
1da177e4 | 1199 | if (retval) { |
fdc9167a | 1200 | pr_err("Failed to register master driver. err=%d.\n", |
1da177e4 LT |
1201 | retval); |
1202 | goto err_out_bus_unregister; | |
1203 | } | |
1204 | ||
7f772ed8 EP |
1205 | retval = driver_register(&w1_slave_driver); |
1206 | if (retval) { | |
fdc9167a | 1207 | pr_err("Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1208 | retval); |
1209 | goto err_out_master_unregister; | |
1210 | } | |
1211 | ||
1da177e4 LT |
1212 | return 0; |
1213 | ||
c30c9b15 DF |
1214 | #if 0 |
1215 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1216 | err_out_slave_unregister: |
1217 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1218 | #endif |
7f772ed8 EP |
1219 | |
1220 | err_out_master_unregister: | |
1221 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1222 | |
1223 | err_out_bus_unregister: | |
1224 | bus_unregister(&w1_bus_type); | |
1225 | ||
1226 | err_out_exit_init: | |
1227 | return retval; | |
1228 | } | |
1229 | ||
73a98fce | 1230 | static void __exit w1_fini(void) |
1da177e4 LT |
1231 | { |
1232 | struct w1_master *dev; | |
1da177e4 | 1233 | |
c30c9b15 | 1234 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1235 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1236 | __w1_remove_master_device(dev); |
1da177e4 | 1237 | |
12003375 EP |
1238 | w1_fini_netlink(); |
1239 | ||
7f772ed8 EP |
1240 | driver_unregister(&w1_slave_driver); |
1241 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1242 | bus_unregister(&w1_bus_type); |
1243 | } | |
1244 | ||
1245 | module_init(w1_init); | |
1246 | module_exit(w1_fini); | |
50fa2951 AD |
1247 | |
1248 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); | |
1249 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); | |
1250 | MODULE_LICENSE("GPL"); |