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