Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 | 3 | * |
a8018766 | 4 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
7785925d | 5 | * |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/delay.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/sched.h> | |
674a396c | 33 | #include <linux/kthread.h> |
7dfb7103 | 34 | #include <linux/freezer.h> |
1da177e4 | 35 | |
60063497 | 36 | #include <linux/atomic.h> |
1da177e4 LT |
37 | |
38 | #include "w1.h" | |
1da177e4 LT |
39 | #include "w1_log.h" |
40 | #include "w1_int.h" | |
41 | #include "w1_family.h" | |
42 | #include "w1_netlink.h" | |
43 | ||
44 | MODULE_LICENSE("GPL"); | |
a8018766 | 45 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
1da177e4 LT |
46 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); |
47 | ||
48 | static int w1_timeout = 10; | |
c3098356 | 49 | static int w1_timeout_us = 0; |
a1613056 | 50 | int w1_max_slave_count = 64; |
1da177e4 LT |
51 | int w1_max_slave_ttl = 10; |
52 | ||
53 | module_param_named(timeout, w1_timeout, int, 0); | |
b3be177a | 54 | MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); |
c3098356 DK |
55 | module_param_named(timeout_us, w1_timeout_us, int, 0); |
56 | MODULE_PARM_DESC(timeout, "time in microseconds between automatic slave" | |
57 | " searches"); | |
b3be177a DF |
58 | /* A search stops when w1_max_slave_count devices have been found in that |
59 | * search. The next search will start over and detect the same set of devices | |
60 | * on a static 1-wire bus. Memory is not allocated based on this number, just | |
61 | * on the number of devices known to the kernel. Having a high number does not | |
62 | * consume additional resources. As a special case, if there is only one | |
63 | * device on the network and w1_max_slave_count is set to 1, the device id can | |
64 | * be read directly skipping the normal slower search process. | |
65 | */ | |
1da177e4 | 66 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
b3be177a DF |
67 | MODULE_PARM_DESC(max_slave_count, |
68 | "maximum number of slaves detected in a search"); | |
1da177e4 | 69 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
b3be177a DF |
70 | MODULE_PARM_DESC(slave_ttl, |
71 | "Number of searches not seeing a slave before it will be removed"); | |
1da177e4 | 72 | |
abd52a13 | 73 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
74 | LIST_HEAD(w1_masters); |
75 | ||
1da177e4 LT |
76 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
77 | { | |
78 | return 1; | |
79 | } | |
80 | ||
81 | static int w1_master_probe(struct device *dev) | |
82 | { | |
83 | return -ENODEV; | |
84 | } | |
85 | ||
1da177e4 LT |
86 | static void w1_master_release(struct device *dev) |
87 | { | |
db2d0008 | 88 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
89 | |
90 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
91 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
92 | kfree(md); | |
1da177e4 LT |
93 | } |
94 | ||
95 | static void w1_slave_release(struct device *dev) | |
96 | { | |
db2d0008 | 97 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 98 | |
9fcbbac5 | 99 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
3aca692d EP |
100 | |
101 | w1_family_put(sl->family); | |
102 | sl->master->slave_count--; | |
1da177e4 LT |
103 | } |
104 | ||
5b187b3c | 105 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 106 | { |
3aca692d | 107 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 108 | |
3aca692d | 109 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 | 110 | } |
5b187b3c | 111 | static DEVICE_ATTR_RO(name); |
1da177e4 | 112 | |
5b187b3c | 113 | static ssize_t id_show(struct device *dev, |
07e00341 | 114 | struct device_attribute *attr, char *buf) |
1da177e4 | 115 | { |
07e00341 DF |
116 | struct w1_slave *sl = dev_to_w1_slave(dev); |
117 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 118 | |
07e00341 | 119 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 120 | return count; |
3aca692d | 121 | } |
5b187b3c | 122 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 123 | |
5b187b3c GKH |
124 | static struct attribute *w1_slave_attrs[] = { |
125 | &dev_attr_name.attr, | |
126 | &dev_attr_id.attr, | |
127 | NULL, | |
128 | }; | |
129 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 130 | |
d2a4ef6a | 131 | /* Default family */ |
f522d239 | 132 | |
36c27a65 GKH |
133 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
134 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
135 | size_t count) | |
f522d239 EP |
136 | { |
137 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
138 | ||
abd52a13 | 139 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
140 | if (w1_reset_select_slave(sl)) { |
141 | count = 0; | |
142 | goto out_up; | |
143 | } | |
144 | ||
145 | w1_write_block(sl->master, buf, count); | |
146 | ||
147 | out_up: | |
abd52a13 | 148 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
149 | return count; |
150 | } | |
151 | ||
36c27a65 GKH |
152 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
153 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
154 | size_t count) | |
f522d239 EP |
155 | { |
156 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
157 | ||
abd52a13 | 158 | mutex_lock(&sl->master->mutex); |
f522d239 | 159 | w1_read_block(sl->master, buf, count); |
abd52a13 | 160 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
161 | return count; |
162 | } | |
163 | ||
36c27a65 GKH |
164 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
165 | ||
166 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
167 | &bin_attr_rw, | |
168 | NULL, | |
f522d239 EP |
169 | }; |
170 | ||
36c27a65 GKH |
171 | static const struct attribute_group w1_slave_default_group = { |
172 | .bin_attrs = w1_slave_bin_attrs, | |
173 | }; | |
f522d239 | 174 | |
36c27a65 GKH |
175 | static const struct attribute_group *w1_slave_default_groups[] = { |
176 | &w1_slave_default_group, | |
177 | NULL, | |
178 | }; | |
f522d239 EP |
179 | |
180 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 181 | .groups = w1_slave_default_groups, |
f522d239 EP |
182 | }; |
183 | ||
184 | static struct w1_family w1_default_family = { | |
185 | .fops = &w1_default_fops, | |
186 | }; | |
d2a4ef6a | 187 | |
7eff2e7a | 188 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 189 | |
1da177e4 LT |
190 | static struct bus_type w1_bus_type = { |
191 | .name = "w1", | |
192 | .match = w1_master_match, | |
312c004d | 193 | .uevent = w1_uevent, |
1da177e4 LT |
194 | }; |
195 | ||
7f772ed8 EP |
196 | struct device_driver w1_master_driver = { |
197 | .name = "w1_master_driver", | |
1da177e4 LT |
198 | .bus = &w1_bus_type, |
199 | .probe = w1_master_probe, | |
1da177e4 LT |
200 | }; |
201 | ||
7f772ed8 | 202 | struct device w1_master_device = { |
1da177e4 LT |
203 | .parent = NULL, |
204 | .bus = &w1_bus_type, | |
40f91de6 | 205 | .init_name = "w1 bus master", |
7f772ed8 | 206 | .driver = &w1_master_driver, |
1da177e4 LT |
207 | .release = &w1_master_release |
208 | }; | |
209 | ||
2c5bfdac | 210 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
211 | .name = "w1_slave_driver", |
212 | .bus = &w1_bus_type, | |
213 | }; | |
214 | ||
2c5bfdac | 215 | #if 0 |
7f772ed8 EP |
216 | struct device w1_slave_device = { |
217 | .parent = NULL, | |
218 | .bus = &w1_bus_type, | |
40f91de6 | 219 | .init_name = "w1 bus slave", |
7f772ed8 | 220 | .driver = &w1_slave_driver, |
3aca692d | 221 | .release = &w1_slave_release |
7f772ed8 | 222 | }; |
2c5bfdac | 223 | #endif /* 0 */ |
7f772ed8 | 224 | |
060b8845 | 225 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 226 | { |
db2d0008 | 227 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 228 | ssize_t count; |
7785925d | 229 | |
abd52a13 | 230 | mutex_lock(&md->mutex); |
1da177e4 | 231 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 232 | mutex_unlock(&md->mutex); |
1da177e4 LT |
233 | |
234 | return count; | |
235 | } | |
236 | ||
2a9d0c17 EP |
237 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
238 | struct device_attribute *attr, | |
239 | const char * buf, size_t count) | |
240 | { | |
6a158c0d | 241 | long tmp; |
db2d0008 | 242 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 243 | int ret; |
2a9d0c17 | 244 | |
bf4228f0 JH |
245 | ret = kstrtol(buf, 0, &tmp); |
246 | if (ret) | |
247 | return ret; | |
6a158c0d | 248 | |
abd52a13 | 249 | mutex_lock(&md->mutex); |
6a158c0d | 250 | md->search_count = tmp; |
abd52a13 | 251 | mutex_unlock(&md->mutex); |
af8c7237 DF |
252 | /* Only wake if it is going to be searching. */ |
253 | if (tmp) | |
254 | wake_up_process(md->thread); | |
2a9d0c17 EP |
255 | |
256 | return count; | |
257 | } | |
258 | ||
259 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
260 | struct device_attribute *attr, | |
261 | char *buf) | |
262 | { | |
db2d0008 | 263 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
264 | ssize_t count; |
265 | ||
abd52a13 | 266 | mutex_lock(&md->mutex); |
2a9d0c17 | 267 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 268 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
269 | |
270 | return count; | |
271 | } | |
272 | ||
6a158c0d DF |
273 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
274 | struct device_attribute *attr, | |
275 | const char *buf, size_t count) | |
276 | { | |
277 | long tmp; | |
278 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 279 | int ret; |
6a158c0d | 280 | |
bf4228f0 JH |
281 | ret = kstrtol(buf, 0, &tmp); |
282 | if (ret) | |
283 | return ret; | |
6a158c0d DF |
284 | |
285 | mutex_lock(&md->mutex); | |
286 | md->enable_pullup = tmp; | |
287 | mutex_unlock(&md->mutex); | |
6a158c0d DF |
288 | |
289 | return count; | |
290 | } | |
291 | ||
292 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
293 | struct device_attribute *attr, | |
294 | char *buf) | |
295 | { | |
296 | struct w1_master *md = dev_to_w1_master(dev); | |
297 | ssize_t count; | |
298 | ||
299 | mutex_lock(&md->mutex); | |
300 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
301 | mutex_unlock(&md->mutex); | |
302 | ||
303 | return count; | |
304 | } | |
305 | ||
060b8845 | 306 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 307 | { |
db2d0008 | 308 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 309 | ssize_t count; |
7785925d | 310 | |
abd52a13 | 311 | mutex_lock(&md->mutex); |
1da177e4 | 312 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 313 | mutex_unlock(&md->mutex); |
1da177e4 LT |
314 | return count; |
315 | } | |
316 | ||
060b8845 | 317 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
318 | { |
319 | ssize_t count; | |
320 | count = sprintf(buf, "%d\n", w1_timeout); | |
321 | return count; | |
322 | } | |
323 | ||
c3098356 DK |
324 | static ssize_t w1_master_attribute_show_timeout_us(struct device *dev, |
325 | struct device_attribute *attr, char *buf) | |
326 | { | |
327 | ssize_t count; | |
328 | count = sprintf(buf, "%d\n", w1_timeout_us); | |
329 | return count; | |
330 | } | |
331 | ||
a1613056 DF |
332 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
333 | struct device_attribute *attr, const char *buf, size_t count) | |
334 | { | |
a7155f4e | 335 | int tmp; |
a1613056 DF |
336 | struct w1_master *md = dev_to_w1_master(dev); |
337 | ||
a7155f4e | 338 | if (kstrtoint(buf, 0, &tmp) == -EINVAL || tmp < 1) |
a1613056 DF |
339 | return -EINVAL; |
340 | ||
341 | mutex_lock(&md->mutex); | |
342 | md->max_slave_count = tmp; | |
343 | /* allow each time the max_slave_count is updated */ | |
344 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
345 | mutex_unlock(&md->mutex); | |
346 | ||
347 | return count; | |
348 | } | |
349 | ||
060b8845 | 350 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 351 | { |
db2d0008 | 352 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 353 | ssize_t count; |
7785925d | 354 | |
abd52a13 | 355 | mutex_lock(&md->mutex); |
1da177e4 | 356 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 357 | mutex_unlock(&md->mutex); |
1da177e4 LT |
358 | return count; |
359 | } | |
360 | ||
060b8845 | 361 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 362 | { |
db2d0008 | 363 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 364 | ssize_t count; |
7785925d | 365 | |
abd52a13 | 366 | mutex_lock(&md->mutex); |
1da177e4 | 367 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 368 | mutex_unlock(&md->mutex); |
1da177e4 LT |
369 | return count; |
370 | } | |
371 | ||
060b8845 | 372 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 373 | { |
db2d0008 | 374 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 375 | ssize_t count; |
7785925d | 376 | |
abd52a13 | 377 | mutex_lock(&md->mutex); |
1da177e4 | 378 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 379 | mutex_unlock(&md->mutex); |
1da177e4 LT |
380 | return count; |
381 | } | |
382 | ||
9b467411 DF |
383 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
1da177e4 | 385 | { |
db2d0008 | 386 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 387 | int c = PAGE_SIZE; |
9fcbbac5 DF |
388 | struct list_head *ent, *n; |
389 | struct w1_slave *sl = NULL; | |
1da177e4 | 390 | |
9fcbbac5 | 391 | mutex_lock(&md->list_mutex); |
1da177e4 | 392 | |
9fcbbac5 DF |
393 | list_for_each_safe(ent, n, &md->slist) { |
394 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
1da177e4 | 395 | |
9fcbbac5 | 396 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 | 397 | } |
9fcbbac5 DF |
398 | if (!sl) |
399 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
1da177e4 | 400 | |
9fcbbac5 | 401 | mutex_unlock(&md->list_mutex); |
1da177e4 LT |
402 | |
403 | return PAGE_SIZE - c; | |
404 | } | |
405 | ||
9b467411 DF |
406 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
407 | struct device_attribute *attr, char *buf) | |
408 | { | |
409 | int c = PAGE_SIZE; | |
410 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
411 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
412 | return PAGE_SIZE - c; | |
413 | } | |
414 | ||
415 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
416 | struct w1_reg_num *rn) | |
417 | { | |
418 | unsigned int family; | |
419 | unsigned long long id; | |
420 | int i; | |
421 | u64 rn64_le; | |
422 | ||
423 | /* The CRC value isn't read from the user because the sysfs directory | |
424 | * doesn't include it and most messages from the bus search don't | |
425 | * print it either. It would be unreasonable for the user to then | |
426 | * provide it. | |
427 | */ | |
428 | const char *error_msg = "bad slave string format, expecting " | |
429 | "ff-dddddddddddd\n"; | |
430 | ||
431 | if (buf[2] != '-') { | |
432 | dev_err(dev, "%s", error_msg); | |
433 | return -EINVAL; | |
434 | } | |
435 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
436 | if (i != 2) { | |
437 | dev_err(dev, "%s", error_msg); | |
438 | return -EINVAL; | |
439 | } | |
440 | rn->family = family; | |
441 | rn->id = id; | |
442 | ||
443 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
444 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
445 | ||
446 | #if 0 | |
447 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
448 | rn->family, (unsigned long long)rn->id, rn->crc); | |
449 | #endif | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
9fcbbac5 | 455 | * Note: must not hold list_mutex |
9b467411 | 456 | */ |
70b34d2e | 457 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
9b467411 DF |
458 | struct w1_reg_num *rn) |
459 | { | |
460 | struct w1_slave *sl; | |
9fcbbac5 | 461 | mutex_lock(&dev->list_mutex); |
9b467411 DF |
462 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
463 | if (sl->reg_num.family == rn->family && | |
464 | sl->reg_num.id == rn->id && | |
465 | sl->reg_num.crc == rn->crc) { | |
9fcbbac5 | 466 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
467 | return sl; |
468 | } | |
469 | } | |
9fcbbac5 | 470 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
471 | return NULL; |
472 | } | |
473 | ||
474 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
475 | struct device_attribute *attr, | |
476 | const char *buf, size_t count) | |
477 | { | |
478 | struct w1_master *md = dev_to_w1_master(dev); | |
479 | struct w1_reg_num rn; | |
480 | struct w1_slave *sl; | |
481 | ssize_t result = count; | |
482 | ||
483 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
484 | return -EINVAL; | |
485 | ||
486 | mutex_lock(&md->mutex); | |
487 | sl = w1_slave_search_device(md, &rn); | |
488 | /* It would be nice to do a targeted search one the one-wire bus | |
489 | * for the new device to see if it is out there or not. But the | |
490 | * current search doesn't support that. | |
491 | */ | |
492 | if (sl) { | |
493 | dev_info(dev, "Device %s already exists\n", sl->name); | |
494 | result = -EINVAL; | |
495 | } else { | |
496 | w1_attach_slave_device(md, &rn); | |
497 | } | |
498 | mutex_unlock(&md->mutex); | |
499 | ||
500 | return result; | |
501 | } | |
502 | ||
503 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
504 | struct device_attribute *attr, char *buf) | |
505 | { | |
506 | int c = PAGE_SIZE; | |
507 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
508 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
509 | return PAGE_SIZE - c; | |
510 | } | |
511 | ||
512 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
513 | struct device_attribute *attr, | |
514 | const char *buf, size_t count) | |
515 | { | |
516 | struct w1_master *md = dev_to_w1_master(dev); | |
517 | struct w1_reg_num rn; | |
518 | struct w1_slave *sl; | |
519 | ssize_t result = count; | |
520 | ||
521 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
522 | return -EINVAL; | |
523 | ||
524 | mutex_lock(&md->mutex); | |
525 | sl = w1_slave_search_device(md, &rn); | |
526 | if (sl) { | |
9fcbbac5 DF |
527 | result = w1_slave_detach(sl); |
528 | /* refcnt 0 means it was detached in the call */ | |
529 | if (result == 0) | |
530 | result = count; | |
9b467411 DF |
531 | } else { |
532 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
533 | (unsigned long long)rn.id); | |
534 | result = -EINVAL; | |
535 | } | |
536 | mutex_unlock(&md->mutex); | |
537 | ||
538 | return result; | |
539 | } | |
540 | ||
7785925d EP |
541 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
542 | struct device_attribute w1_master_attribute_##_name = \ | |
543 | __ATTR(w1_master_##_name, _mode, \ | |
544 | w1_master_attribute_show_##_name, NULL) | |
545 | ||
2a9d0c17 EP |
546 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
547 | struct device_attribute w1_master_attribute_##_name = \ | |
548 | __ATTR(w1_master_##_name, _mode, \ | |
549 | w1_master_attribute_show_##_name, \ | |
550 | w1_master_attribute_store_##_name) | |
551 | ||
7785925d EP |
552 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
553 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
554 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 555 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
556 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
557 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
c3098356 | 558 | static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO); |
7785925d | 559 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
12aa4c64 BS |
560 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
561 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
562 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
563 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
564 | |
565 | static struct attribute *w1_master_default_attrs[] = { | |
566 | &w1_master_attribute_name.attr, | |
567 | &w1_master_attribute_slaves.attr, | |
568 | &w1_master_attribute_slave_count.attr, | |
569 | &w1_master_attribute_max_slave_count.attr, | |
570 | &w1_master_attribute_attempts.attr, | |
571 | &w1_master_attribute_timeout.attr, | |
c3098356 | 572 | &w1_master_attribute_timeout_us.attr, |
7785925d | 573 | &w1_master_attribute_pointer.attr, |
2a9d0c17 | 574 | &w1_master_attribute_search.attr, |
6a158c0d | 575 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
576 | &w1_master_attribute_add.attr, |
577 | &w1_master_attribute_remove.attr, | |
7785925d | 578 | NULL |
1da177e4 LT |
579 | }; |
580 | ||
7785925d EP |
581 | static struct attribute_group w1_master_defattr_group = { |
582 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
583 | }; |
584 | ||
7785925d EP |
585 | int w1_create_master_attributes(struct w1_master *master) |
586 | { | |
587 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
588 | } | |
589 | ||
c30c9b15 | 590 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
591 | { |
592 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
593 | } | |
594 | ||
7eff2e7a | 595 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
596 | { |
597 | struct w1_master *md = NULL; | |
598 | struct w1_slave *sl = NULL; | |
599 | char *event_owner, *name; | |
526be416 | 600 | int err = 0; |
7f772ed8 EP |
601 | |
602 | if (dev->driver == &w1_master_driver) { | |
603 | md = container_of(dev, struct w1_master, dev); | |
604 | event_owner = "master"; | |
605 | name = md->name; | |
606 | } else if (dev->driver == &w1_slave_driver) { | |
607 | sl = container_of(dev, struct w1_slave, dev); | |
608 | event_owner = "slave"; | |
609 | name = sl->name; | |
610 | } else { | |
312c004d | 611 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
612 | return -EINVAL; |
613 | } | |
614 | ||
c6976a4e | 615 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 616 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
617 | |
618 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 619 | goto end; |
7f772ed8 | 620 | |
7eff2e7a | 621 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 622 | if (err) |
526be416 | 623 | goto end; |
7f772ed8 | 624 | |
7eff2e7a KS |
625 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
626 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
627 | end: |
628 | return err; | |
629 | } | |
7f772ed8 | 630 | |
18d7f891 | 631 | static int w1_family_notify(unsigned long action, struct w1_slave *sl) |
47eba33a | 632 | { |
36c27a65 | 633 | struct w1_family_ops *fops; |
47eba33a GKH |
634 | int err; |
635 | ||
36c27a65 | 636 | fops = sl->family->fops; |
47eba33a | 637 | |
2962aece HFV |
638 | if (!fops) |
639 | return 0; | |
640 | ||
47eba33a GKH |
641 | switch (action) { |
642 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 643 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
644 | if (fops->add_slave) { |
645 | err = fops->add_slave(sl); | |
646 | if (err < 0) { | |
647 | dev_err(&sl->dev, | |
648 | "add_slave() call failed. err=%d\n", | |
649 | err); | |
650 | return err; | |
651 | } | |
652 | } | |
653 | if (fops->groups) { | |
654 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
655 | if (err) { | |
656 | dev_err(&sl->dev, | |
657 | "sysfs group creation failed. err=%d\n", | |
658 | err); | |
659 | return err; | |
660 | } | |
47eba33a GKH |
661 | } |
662 | ||
663 | break; | |
664 | case BUS_NOTIFY_DEL_DEVICE: | |
36c27a65 | 665 | if (fops->remove_slave) |
47eba33a | 666 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
667 | if (fops->groups) |
668 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
669 | break; |
670 | } | |
671 | return 0; | |
672 | } | |
673 | ||
1da177e4 LT |
674 | static int __w1_attach_slave_device(struct w1_slave *sl) |
675 | { | |
676 | int err; | |
677 | ||
678 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 679 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
680 | sl->dev.bus = &w1_bus_type; |
681 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 682 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 683 | |
40f91de6 | 684 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
685 | (unsigned int) sl->reg_num.family, |
686 | (unsigned long long) sl->reg_num.id); | |
687 | snprintf(&sl->name[0], sizeof(sl->name), | |
688 | "%02x-%012llx", | |
689 | (unsigned int) sl->reg_num.family, | |
690 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 691 | |
c6976a4e | 692 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 693 | dev_name(&sl->dev), sl); |
1da177e4 | 694 | |
18d7f891 DF |
695 | /* suppress for w1_family_notify before sending KOBJ_ADD */ |
696 | dev_set_uevent_suppress(&sl->dev, true); | |
697 | ||
1da177e4 LT |
698 | err = device_register(&sl->dev); |
699 | if (err < 0) { | |
700 | dev_err(&sl->dev, | |
6b729861 | 701 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 702 | dev_name(&sl->dev), err); |
1da177e4 LT |
703 | return err; |
704 | } | |
18d7f891 | 705 | w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl); |
1da177e4 | 706 | |
47eba33a GKH |
707 | dev_set_uevent_suppress(&sl->dev, false); |
708 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 | 709 | |
9fcbbac5 | 710 | mutex_lock(&sl->master->list_mutex); |
1da177e4 | 711 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
9fcbbac5 | 712 | mutex_unlock(&sl->master->list_mutex); |
1da177e4 LT |
713 | |
714 | return 0; | |
715 | } | |
716 | ||
70b34d2e | 717 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
1da177e4 LT |
718 | { |
719 | struct w1_slave *sl; | |
720 | struct w1_family *f; | |
721 | int err; | |
722 | struct w1_netlink_msg msg; | |
723 | ||
dd00cc48 | 724 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
725 | if (!sl) { |
726 | dev_err(&dev->dev, | |
727 | "%s: failed to allocate new slave device.\n", | |
728 | __func__); | |
729 | return -ENOMEM; | |
730 | } | |
731 | ||
1da177e4 LT |
732 | |
733 | sl->owner = THIS_MODULE; | |
734 | sl->master = dev; | |
bb670937 | 735 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 736 | |
12003375 | 737 | memset(&msg, 0, sizeof(msg)); |
1da177e4 | 738 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
9fcbbac5 DF |
739 | atomic_set(&sl->refcnt, 1); |
740 | atomic_inc(&sl->master->refcnt); | |
1da177e4 | 741 | |
bc04d76d HFV |
742 | /* slave modules need to be loaded in a context with unlocked mutex */ |
743 | mutex_unlock(&dev->mutex); | |
4b7e4f82 | 744 | request_module("w1-family-0x%02x", rn->family); |
bc04d76d | 745 | mutex_lock(&dev->mutex); |
8d7bda51 | 746 | |
1da177e4 LT |
747 | spin_lock(&w1_flock); |
748 | f = w1_family_registered(rn->family); | |
749 | if (!f) { | |
99c5bfe9 | 750 | f= &w1_default_family; |
1da177e4 LT |
751 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
752 | rn->family, rn->family, | |
753 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
754 | } |
755 | __w1_family_get(f); | |
756 | spin_unlock(&w1_flock); | |
757 | ||
758 | sl->family = f; | |
759 | ||
760 | ||
761 | err = __w1_attach_slave_device(sl); | |
762 | if (err < 0) { | |
763 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
764 | sl->name); | |
765 | w1_family_put(sl->family); | |
766 | kfree(sl); | |
767 | return err; | |
768 | } | |
769 | ||
770 | sl->ttl = dev->slave_ttl; | |
771 | dev->slave_count++; | |
772 | ||
12003375 | 773 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
774 | msg.type = W1_SLAVE_ADD; |
775 | w1_netlink_send(dev, &msg); | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
9fcbbac5 | 780 | int w1_unref_slave(struct w1_slave *sl) |
1da177e4 | 781 | { |
9fcbbac5 DF |
782 | struct w1_master *dev = sl->master; |
783 | int refcnt; | |
784 | mutex_lock(&dev->list_mutex); | |
785 | refcnt = atomic_sub_return(1, &sl->refcnt); | |
786 | if (refcnt == 0) { | |
787 | struct w1_netlink_msg msg; | |
788 | ||
789 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, | |
790 | sl->name, sl); | |
791 | ||
792 | list_del(&sl->w1_slave_entry); | |
793 | ||
794 | memset(&msg, 0, sizeof(msg)); | |
795 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
796 | msg.type = W1_SLAVE_REMOVE; | |
797 | w1_netlink_send(sl->master, &msg); | |
798 | ||
18d7f891 | 799 | w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl); |
9fcbbac5 DF |
800 | device_unregister(&sl->dev); |
801 | #ifdef DEBUG | |
802 | memset(sl, 0, sizeof(*sl)); | |
803 | #endif | |
804 | kfree(sl); | |
805 | } | |
806 | atomic_dec(&dev->refcnt); | |
807 | mutex_unlock(&dev->list_mutex); | |
808 | return refcnt; | |
809 | } | |
1da177e4 | 810 | |
9fcbbac5 DF |
811 | int w1_slave_detach(struct w1_slave *sl) |
812 | { | |
813 | /* Only detach a slave once as it decreases the refcnt each time. */ | |
814 | int destroy_now; | |
815 | mutex_lock(&sl->master->list_mutex); | |
816 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); | |
817 | set_bit(W1_SLAVE_DETACH, &sl->flags); | |
818 | mutex_unlock(&sl->master->list_mutex); | |
819 | ||
820 | if (destroy_now) | |
821 | destroy_now = !w1_unref_slave(sl); | |
822 | return destroy_now ? 0 : -EBUSY; | |
1da177e4 LT |
823 | } |
824 | ||
12003375 EP |
825 | struct w1_master *w1_search_master_id(u32 id) |
826 | { | |
827 | struct w1_master *dev; | |
828 | int found = 0; | |
829 | ||
abd52a13 | 830 | mutex_lock(&w1_mlock); |
12003375 EP |
831 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
832 | if (dev->id == id) { | |
833 | found = 1; | |
834 | atomic_inc(&dev->refcnt); | |
835 | break; | |
836 | } | |
837 | } | |
abd52a13 | 838 | mutex_unlock(&w1_mlock); |
12003375 EP |
839 | |
840 | return (found)?dev:NULL; | |
841 | } | |
842 | ||
843 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
844 | { | |
845 | struct w1_master *dev; | |
846 | struct w1_slave *sl = NULL; | |
847 | int found = 0; | |
848 | ||
abd52a13 | 849 | mutex_lock(&w1_mlock); |
12003375 | 850 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
9fcbbac5 | 851 | mutex_lock(&dev->list_mutex); |
12003375 EP |
852 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
853 | if (sl->reg_num.family == id->family && | |
854 | sl->reg_num.id == id->id && | |
855 | sl->reg_num.crc == id->crc) { | |
856 | found = 1; | |
857 | atomic_inc(&dev->refcnt); | |
858 | atomic_inc(&sl->refcnt); | |
859 | break; | |
860 | } | |
861 | } | |
9fcbbac5 | 862 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
863 | |
864 | if (found) | |
865 | break; | |
866 | } | |
abd52a13 | 867 | mutex_unlock(&w1_mlock); |
12003375 EP |
868 | |
869 | return (found)?sl:NULL; | |
870 | } | |
871 | ||
c30c9b15 | 872 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 873 | { |
c30c9b15 | 874 | struct w1_slave *sl, *sln; |
6adf87bd EP |
875 | struct w1_master *dev; |
876 | ||
abd52a13 | 877 | mutex_lock(&w1_mlock); |
6adf87bd | 878 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
879 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
880 | "for family %02x.\n", dev->name, f->fid); | |
881 | mutex_lock(&dev->mutex); | |
9fcbbac5 | 882 | mutex_lock(&dev->list_mutex); |
c30c9b15 DF |
883 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
884 | /* If it is a new family, slaves with the default | |
885 | * family driver and are that family will be | |
886 | * connected. If the family is going away, devices | |
887 | * matching that family are reconneced. | |
888 | */ | |
889 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
890 | && sl->reg_num.family == f->fid) || | |
891 | (!attach && sl->family->fid == f->fid)) { | |
892 | struct w1_reg_num rn; | |
893 | ||
9fcbbac5 | 894 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 895 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
9fcbbac5 DF |
896 | /* If it was already in use let the automatic |
897 | * scan pick it up again later. | |
898 | */ | |
899 | if (!w1_slave_detach(sl)) | |
900 | w1_attach_slave_device(dev, &rn); | |
901 | mutex_lock(&dev->list_mutex); | |
c30c9b15 DF |
902 | } |
903 | } | |
904 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
905 | "has been finished.\n", dev->name); | |
9fcbbac5 | 906 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 907 | mutex_unlock(&dev->mutex); |
6adf87bd | 908 | } |
abd52a13 | 909 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
910 | } |
911 | ||
963bb101 | 912 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 913 | { |
1da177e4 | 914 | struct w1_slave *sl; |
1da177e4 | 915 | struct w1_reg_num *tmp; |
0e65f828 | 916 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 917 | |
c30c9b15 | 918 | atomic_inc(&dev->refcnt); |
7785925d | 919 | |
1da177e4 LT |
920 | tmp = (struct w1_reg_num *) &rn; |
921 | ||
cd7b28d3 DF |
922 | sl = w1_slave_search_device(dev, tmp); |
923 | if (sl) { | |
bb670937 | 924 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
925 | } else { |
926 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
927 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 928 | } |
7785925d | 929 | |
1da177e4 LT |
930 | atomic_dec(&dev->refcnt); |
931 | } | |
932 | ||
6b729861 | 933 | /** |
b3be177a DF |
934 | * w1_search() - Performs a ROM Search & registers any devices found. |
935 | * @dev: The master device to search | |
936 | * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH | |
937 | * to return only devices in the alarmed state | |
938 | * @cb: Function to call when a device is found | |
939 | * | |
6b729861 EP |
940 | * The 1-wire search is a simple binary tree search. |
941 | * For each bit of the address, we read two bits and write one bit. | |
942 | * The bit written will put to sleep all devies that don't match that bit. | |
943 | * When the two reads differ, the direction choice is obvious. | |
944 | * When both bits are 0, we must choose a path to take. | |
945 | * When we can scan all 64 bits without having to choose a path, we are done. | |
946 | * | |
947 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
948 | * | |
6b729861 | 949 | */ |
12003375 | 950 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 951 | { |
6b729861 EP |
952 | u64 last_rn, rn, tmp64; |
953 | int i, slave_count = 0; | |
954 | int last_zero, last_device; | |
955 | int search_bit, desc_bit; | |
956 | u8 triplet_ret = 0; | |
1da177e4 | 957 | |
6b729861 | 958 | search_bit = 0; |
3c6955e5 DF |
959 | rn = dev->search_id; |
960 | last_rn = 0; | |
6b729861 EP |
961 | last_device = 0; |
962 | last_zero = -1; | |
1da177e4 LT |
963 | |
964 | desc_bit = 64; | |
965 | ||
6b729861 EP |
966 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
967 | last_rn = rn; | |
1da177e4 LT |
968 | rn = 0; |
969 | ||
1da177e4 LT |
970 | /* |
971 | * Reset bus and all 1-wire device state machines | |
972 | * so they can respond to our requests. | |
973 | * | |
974 | * Return 0 - device(s) present, 1 - no devices present. | |
975 | */ | |
b02f8bed | 976 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 977 | if (w1_reset_bus(dev)) { |
b02f8bed | 978 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 979 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
980 | break; |
981 | } | |
982 | ||
c9cbf558 EP |
983 | /* Do fast search on single slave bus */ |
984 | if (dev->max_slave_count == 1) { | |
b02f8bed | 985 | int rv; |
c9cbf558 | 986 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
987 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
988 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 989 | |
b02f8bed | 990 | if (rv == 8 && rn) |
c9cbf558 EP |
991 | cb(dev, rn); |
992 | ||
993 | break; | |
994 | } | |
995 | ||
6b729861 | 996 | /* Start the search */ |
12003375 | 997 | w1_write_8(dev, search_type); |
1da177e4 | 998 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
999 | /* Determine the direction/search bit */ |
1000 | if (i == desc_bit) | |
1001 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
1002 | else if (i > desc_bit) | |
1003 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 1004 | else |
6b729861 | 1005 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 1006 | |
b3be177a | 1007 | /* Read two bits and write one bit */ |
6b729861 EP |
1008 | triplet_ret = w1_triplet(dev, search_bit); |
1009 | ||
1010 | /* quit if no device responded */ | |
1011 | if ( (triplet_ret & 0x03) == 0x03 ) | |
1012 | break; | |
1da177e4 | 1013 | |
6b729861 EP |
1014 | /* If both directions were valid, and we took the 0 path... */ |
1015 | if (triplet_ret == 0) | |
1016 | last_zero = i; | |
1da177e4 | 1017 | |
6b729861 EP |
1018 | /* extract the direction taken & update the device number */ |
1019 | tmp64 = (triplet_ret >> 2); | |
1020 | rn |= (tmp64 << i); | |
0d671b27 | 1021 | |
42105698 | 1022 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 1023 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 1024 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
1025 | return; |
1026 | } | |
6b729861 | 1027 | } |
b02f8bed | 1028 | mutex_unlock(&dev->bus_mutex); |
7785925d | 1029 | |
6b729861 | 1030 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 1031 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 1032 | last_device = 1; |
3c6955e5 DF |
1033 | dev->search_id = 0; |
1034 | } else { | |
1035 | dev->search_id = rn; | |
1036 | } | |
6b729861 | 1037 | desc_bit = last_zero; |
c30c9b15 | 1038 | cb(dev, rn); |
6b729861 | 1039 | } |
a1613056 DF |
1040 | |
1041 | if (!last_device && slave_count == dev->max_slave_count && | |
1042 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1043 | /* Only max_slave_count will be scanned in a search, |
1044 | * but it will start where it left off next search | |
1045 | * until all ids are identified and then it will start | |
1046 | * over. A continued search will report the previous | |
1047 | * last id as the first id (provided it is still on the | |
1048 | * bus). | |
1049 | */ | |
a1613056 | 1050 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1051 | "will continue next search.\n", __func__, |
a1613056 DF |
1052 | dev->max_slave_count); |
1053 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1054 | } | |
1da177e4 LT |
1055 | } |
1056 | } | |
1057 | ||
963bb101 DF |
1058 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1059 | w1_slave_found_callback cb) | |
12003375 EP |
1060 | { |
1061 | struct w1_slave *sl, *sln; | |
1062 | ||
9fcbbac5 | 1063 | mutex_lock(&dev->list_mutex); |
12003375 | 1064 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
bb670937 | 1065 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
9fcbbac5 | 1066 | mutex_unlock(&dev->list_mutex); |
12003375 | 1067 | |
963bb101 | 1068 | w1_search_devices(dev, search_type, cb); |
12003375 | 1069 | |
9fcbbac5 | 1070 | mutex_lock(&dev->list_mutex); |
12003375 | 1071 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
9fcbbac5 DF |
1072 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
1073 | mutex_unlock(&dev->list_mutex); | |
12003375 | 1074 | w1_slave_detach(sl); |
9fcbbac5 DF |
1075 | mutex_lock(&dev->list_mutex); |
1076 | } | |
bb670937 | 1077 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1078 | sl->ttl = dev->slave_ttl; |
1079 | } | |
9fcbbac5 | 1080 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
1081 | |
1082 | if (dev->search_count > 0) | |
1083 | dev->search_count--; | |
1084 | } | |
1085 | ||
963bb101 DF |
1086 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1087 | { | |
1088 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1089 | } | |
1090 | ||
b3be177a DF |
1091 | /** |
1092 | * w1_process_callbacks() - execute each dev->async_list callback entry | |
1093 | * @dev: w1_master device | |
1094 | * | |
a0f10464 AK |
1095 | * The w1 master list_mutex must be held. |
1096 | * | |
b3be177a DF |
1097 | * Return: 1 if there were commands to executed 0 otherwise |
1098 | */ | |
9fcbbac5 DF |
1099 | int w1_process_callbacks(struct w1_master *dev) |
1100 | { | |
1101 | int ret = 0; | |
1102 | struct w1_async_cmd *async_cmd, *async_n; | |
1103 | ||
1104 | /* The list can be added to in another thread, loop until it is empty */ | |
1105 | while (!list_empty(&dev->async_list)) { | |
1106 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, | |
1107 | async_entry) { | |
1108 | /* drop the lock, if it is a search it can take a long | |
1109 | * time */ | |
1110 | mutex_unlock(&dev->list_mutex); | |
1111 | async_cmd->cb(dev, async_cmd); | |
1112 | ret = 1; | |
1113 | mutex_lock(&dev->list_mutex); | |
1114 | } | |
1115 | } | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | int w1_process(void *data) |
1120 | { | |
1121 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1122 | /* As long as w1_timeout is only set by a module parameter the sleep |
1123 | * time can be calculated in jiffies once. | |
1124 | */ | |
c3098356 DK |
1125 | const unsigned long jtime = |
1126 | usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us); | |
9fcbbac5 DF |
1127 | /* remainder if it woke up early */ |
1128 | unsigned long jremain = 0; | |
1da177e4 | 1129 | |
9fcbbac5 DF |
1130 | for (;;) { |
1131 | ||
1132 | if (!jremain && dev->search_count) { | |
01e14d6d DF |
1133 | mutex_lock(&dev->mutex); |
1134 | w1_search_process(dev, W1_SEARCH); | |
1135 | mutex_unlock(&dev->mutex); | |
1136 | } | |
1137 | ||
9fcbbac5 DF |
1138 | mutex_lock(&dev->list_mutex); |
1139 | /* Note, w1_process_callback drops the lock while processing, | |
1140 | * but locks it again before returning. | |
1141 | */ | |
1142 | if (!w1_process_callbacks(dev) && jremain) { | |
1143 | /* a wake up is either to stop the thread, process | |
1144 | * callbacks, or search, it isn't process callbacks, so | |
1145 | * schedule a search. | |
1146 | */ | |
1147 | jremain = 1; | |
1148 | } | |
1149 | ||
3c52e4e6 DF |
1150 | __set_current_state(TASK_INTERRUPTIBLE); |
1151 | ||
9fcbbac5 DF |
1152 | /* hold list_mutex until after interruptible to prevent loosing |
1153 | * the wakeup signal when async_cmd is added. | |
1154 | */ | |
1155 | mutex_unlock(&dev->list_mutex); | |
1156 | ||
3c52e4e6 DF |
1157 | if (kthread_should_stop()) |
1158 | break; | |
1159 | ||
1160 | /* Only sleep when the search is active. */ | |
9fcbbac5 DF |
1161 | if (dev->search_count) { |
1162 | if (!jremain) | |
1163 | jremain = jtime; | |
1164 | jremain = schedule_timeout(jremain); | |
1165 | } | |
3c52e4e6 DF |
1166 | else |
1167 | schedule(); | |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1171 | |
1172 | return 0; | |
1173 | } | |
1174 | ||
73a98fce | 1175 | static int __init w1_init(void) |
1da177e4 LT |
1176 | { |
1177 | int retval; | |
1178 | ||
fdc9167a | 1179 | pr_info("Driver for 1-wire Dallas network protocol.\n"); |
1da177e4 | 1180 | |
12003375 EP |
1181 | w1_init_netlink(); |
1182 | ||
1da177e4 LT |
1183 | retval = bus_register(&w1_bus_type); |
1184 | if (retval) { | |
fdc9167a | 1185 | pr_err("Failed to register bus. err=%d.\n", retval); |
1da177e4 LT |
1186 | goto err_out_exit_init; |
1187 | } | |
1188 | ||
7f772ed8 | 1189 | retval = driver_register(&w1_master_driver); |
1da177e4 | 1190 | if (retval) { |
fdc9167a | 1191 | pr_err("Failed to register master driver. err=%d.\n", |
1da177e4 LT |
1192 | retval); |
1193 | goto err_out_bus_unregister; | |
1194 | } | |
1195 | ||
7f772ed8 EP |
1196 | retval = driver_register(&w1_slave_driver); |
1197 | if (retval) { | |
fdc9167a | 1198 | pr_err("Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1199 | retval); |
1200 | goto err_out_master_unregister; | |
1201 | } | |
1202 | ||
1da177e4 LT |
1203 | return 0; |
1204 | ||
c30c9b15 DF |
1205 | #if 0 |
1206 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1207 | err_out_slave_unregister: |
1208 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1209 | #endif |
7f772ed8 EP |
1210 | |
1211 | err_out_master_unregister: | |
1212 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1213 | |
1214 | err_out_bus_unregister: | |
1215 | bus_unregister(&w1_bus_type); | |
1216 | ||
1217 | err_out_exit_init: | |
1218 | return retval; | |
1219 | } | |
1220 | ||
73a98fce | 1221 | static void __exit w1_fini(void) |
1da177e4 LT |
1222 | { |
1223 | struct w1_master *dev; | |
1da177e4 | 1224 | |
c30c9b15 | 1225 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1226 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1227 | __w1_remove_master_device(dev); |
1da177e4 | 1228 | |
12003375 EP |
1229 | w1_fini_netlink(); |
1230 | ||
7f772ed8 EP |
1231 | driver_unregister(&w1_slave_driver); |
1232 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1233 | bus_unregister(&w1_bus_type); |
1234 | } | |
1235 | ||
1236 | module_init(w1_init); | |
1237 | module_exit(w1_fini); |