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Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
a8018766 | 3 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
1da177e4 LT |
4 | */ |
5 | ||
6 | #include <linux/delay.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/moduleparam.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/sched.h> | |
674a396c | 17 | #include <linux/kthread.h> |
7dfb7103 | 18 | #include <linux/freezer.h> |
2eb79548 | 19 | #include <linux/hwmon.h> |
fae68031 | 20 | #include <linux/of.h> |
1da177e4 | 21 | |
60063497 | 22 | #include <linux/atomic.h> |
1da177e4 | 23 | |
de0d6dbd | 24 | #include "w1_internal.h" |
1da177e4 LT |
25 | #include "w1_netlink.h" |
26 | ||
de0d6dbd AD |
27 | #define W1_FAMILY_DEFAULT 0 |
28 | ||
1da177e4 | 29 | static int w1_timeout = 10; |
1da177e4 | 30 | module_param_named(timeout, w1_timeout, int, 0); |
b3be177a | 31 | MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); |
50fa2951 AD |
32 | |
33 | static int w1_timeout_us = 0; | |
c3098356 | 34 | module_param_named(timeout_us, w1_timeout_us, int, 0); |
a46b195c WY |
35 | MODULE_PARM_DESC(timeout_us, |
36 | "time in microseconds between automatic slave searches"); | |
50fa2951 | 37 | |
b3be177a DF |
38 | /* A search stops when w1_max_slave_count devices have been found in that |
39 | * search. The next search will start over and detect the same set of devices | |
40 | * on a static 1-wire bus. Memory is not allocated based on this number, just | |
41 | * on the number of devices known to the kernel. Having a high number does not | |
42 | * consume additional resources. As a special case, if there is only one | |
43 | * device on the network and w1_max_slave_count is set to 1, the device id can | |
44 | * be read directly skipping the normal slower search process. | |
45 | */ | |
50fa2951 | 46 | int w1_max_slave_count = 64; |
1da177e4 | 47 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
b3be177a DF |
48 | MODULE_PARM_DESC(max_slave_count, |
49 | "maximum number of slaves detected in a search"); | |
50fa2951 AD |
50 | |
51 | int w1_max_slave_ttl = 10; | |
1da177e4 | 52 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
b3be177a DF |
53 | MODULE_PARM_DESC(slave_ttl, |
54 | "Number of searches not seeing a slave before it will be removed"); | |
1da177e4 | 55 | |
abd52a13 | 56 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
57 | LIST_HEAD(w1_masters); |
58 | ||
1da177e4 LT |
59 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
60 | { | |
61 | return 1; | |
62 | } | |
63 | ||
64 | static int w1_master_probe(struct device *dev) | |
65 | { | |
66 | return -ENODEV; | |
67 | } | |
68 | ||
1da177e4 LT |
69 | static void w1_master_release(struct device *dev) |
70 | { | |
db2d0008 | 71 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
72 | |
73 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
74 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
75 | kfree(md); | |
1da177e4 LT |
76 | } |
77 | ||
78 | static void w1_slave_release(struct device *dev) | |
79 | { | |
db2d0008 | 80 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 81 | |
9fcbbac5 | 82 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
3aca692d EP |
83 | |
84 | w1_family_put(sl->family); | |
85 | sl->master->slave_count--; | |
1da177e4 LT |
86 | } |
87 | ||
5b187b3c | 88 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 89 | { |
3aca692d | 90 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 91 | |
3aca692d | 92 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 | 93 | } |
5b187b3c | 94 | static DEVICE_ATTR_RO(name); |
1da177e4 | 95 | |
5b187b3c | 96 | static ssize_t id_show(struct device *dev, |
07e00341 | 97 | struct device_attribute *attr, char *buf) |
1da177e4 | 98 | { |
07e00341 DF |
99 | struct w1_slave *sl = dev_to_w1_slave(dev); |
100 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 101 | |
07e00341 | 102 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 103 | return count; |
3aca692d | 104 | } |
5b187b3c | 105 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 106 | |
5b187b3c GKH |
107 | static struct attribute *w1_slave_attrs[] = { |
108 | &dev_attr_name.attr, | |
109 | &dev_attr_id.attr, | |
110 | NULL, | |
111 | }; | |
112 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 113 | |
d2a4ef6a | 114 | /* Default family */ |
f522d239 | 115 | |
36c27a65 GKH |
116 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
117 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
118 | size_t count) | |
f522d239 EP |
119 | { |
120 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
121 | ||
abd52a13 | 122 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
123 | if (w1_reset_select_slave(sl)) { |
124 | count = 0; | |
125 | goto out_up; | |
126 | } | |
127 | ||
128 | w1_write_block(sl->master, buf, count); | |
129 | ||
130 | out_up: | |
abd52a13 | 131 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
132 | return count; |
133 | } | |
134 | ||
36c27a65 GKH |
135 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
136 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
137 | size_t count) | |
f522d239 EP |
138 | { |
139 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
140 | ||
abd52a13 | 141 | mutex_lock(&sl->master->mutex); |
f522d239 | 142 | w1_read_block(sl->master, buf, count); |
abd52a13 | 143 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
144 | return count; |
145 | } | |
146 | ||
36c27a65 GKH |
147 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
148 | ||
149 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
150 | &bin_attr_rw, | |
151 | NULL, | |
f522d239 EP |
152 | }; |
153 | ||
36c27a65 GKH |
154 | static const struct attribute_group w1_slave_default_group = { |
155 | .bin_attrs = w1_slave_bin_attrs, | |
156 | }; | |
f522d239 | 157 | |
36c27a65 GKH |
158 | static const struct attribute_group *w1_slave_default_groups[] = { |
159 | &w1_slave_default_group, | |
160 | NULL, | |
161 | }; | |
f522d239 EP |
162 | |
163 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 164 | .groups = w1_slave_default_groups, |
f522d239 EP |
165 | }; |
166 | ||
167 | static struct w1_family w1_default_family = { | |
168 | .fops = &w1_default_fops, | |
169 | }; | |
d2a4ef6a | 170 | |
7eff2e7a | 171 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 172 | |
1da177e4 LT |
173 | static struct bus_type w1_bus_type = { |
174 | .name = "w1", | |
175 | .match = w1_master_match, | |
312c004d | 176 | .uevent = w1_uevent, |
1da177e4 LT |
177 | }; |
178 | ||
7f772ed8 EP |
179 | struct device_driver w1_master_driver = { |
180 | .name = "w1_master_driver", | |
1da177e4 LT |
181 | .bus = &w1_bus_type, |
182 | .probe = w1_master_probe, | |
1da177e4 LT |
183 | }; |
184 | ||
7f772ed8 | 185 | struct device w1_master_device = { |
1da177e4 LT |
186 | .parent = NULL, |
187 | .bus = &w1_bus_type, | |
40f91de6 | 188 | .init_name = "w1 bus master", |
7f772ed8 | 189 | .driver = &w1_master_driver, |
1da177e4 LT |
190 | .release = &w1_master_release |
191 | }; | |
192 | ||
2c5bfdac | 193 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
194 | .name = "w1_slave_driver", |
195 | .bus = &w1_bus_type, | |
196 | }; | |
197 | ||
2c5bfdac | 198 | #if 0 |
7f772ed8 EP |
199 | struct device w1_slave_device = { |
200 | .parent = NULL, | |
201 | .bus = &w1_bus_type, | |
40f91de6 | 202 | .init_name = "w1 bus slave", |
7f772ed8 | 203 | .driver = &w1_slave_driver, |
3aca692d | 204 | .release = &w1_slave_release |
7f772ed8 | 205 | }; |
2c5bfdac | 206 | #endif /* 0 */ |
7f772ed8 | 207 | |
060b8845 | 208 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 209 | { |
db2d0008 | 210 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 211 | ssize_t count; |
7785925d | 212 | |
abd52a13 | 213 | mutex_lock(&md->mutex); |
1da177e4 | 214 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 215 | mutex_unlock(&md->mutex); |
1da177e4 LT |
216 | |
217 | return count; | |
218 | } | |
219 | ||
2a9d0c17 EP |
220 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
221 | struct device_attribute *attr, | |
222 | const char * buf, size_t count) | |
223 | { | |
6a158c0d | 224 | long tmp; |
db2d0008 | 225 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 226 | int ret; |
2a9d0c17 | 227 | |
bf4228f0 JH |
228 | ret = kstrtol(buf, 0, &tmp); |
229 | if (ret) | |
230 | return ret; | |
6a158c0d | 231 | |
abd52a13 | 232 | mutex_lock(&md->mutex); |
6a158c0d | 233 | md->search_count = tmp; |
abd52a13 | 234 | mutex_unlock(&md->mutex); |
af8c7237 DF |
235 | /* Only wake if it is going to be searching. */ |
236 | if (tmp) | |
237 | wake_up_process(md->thread); | |
2a9d0c17 EP |
238 | |
239 | return count; | |
240 | } | |
241 | ||
242 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
243 | struct device_attribute *attr, | |
244 | char *buf) | |
245 | { | |
db2d0008 | 246 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
247 | ssize_t count; |
248 | ||
abd52a13 | 249 | mutex_lock(&md->mutex); |
2a9d0c17 | 250 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 251 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
252 | |
253 | return count; | |
254 | } | |
255 | ||
6a158c0d DF |
256 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
257 | struct device_attribute *attr, | |
258 | const char *buf, size_t count) | |
259 | { | |
260 | long tmp; | |
261 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 262 | int ret; |
6a158c0d | 263 | |
bf4228f0 JH |
264 | ret = kstrtol(buf, 0, &tmp); |
265 | if (ret) | |
266 | return ret; | |
6a158c0d DF |
267 | |
268 | mutex_lock(&md->mutex); | |
269 | md->enable_pullup = tmp; | |
270 | mutex_unlock(&md->mutex); | |
6a158c0d DF |
271 | |
272 | return count; | |
273 | } | |
274 | ||
275 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
276 | struct device_attribute *attr, | |
277 | char *buf) | |
278 | { | |
279 | struct w1_master *md = dev_to_w1_master(dev); | |
280 | ssize_t count; | |
281 | ||
282 | mutex_lock(&md->mutex); | |
283 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
284 | mutex_unlock(&md->mutex); | |
285 | ||
286 | return count; | |
287 | } | |
288 | ||
060b8845 | 289 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 290 | { |
db2d0008 | 291 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 292 | ssize_t count; |
7785925d | 293 | |
abd52a13 | 294 | mutex_lock(&md->mutex); |
1da177e4 | 295 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 296 | mutex_unlock(&md->mutex); |
1da177e4 LT |
297 | return count; |
298 | } | |
299 | ||
060b8845 | 300 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
301 | { |
302 | ssize_t count; | |
303 | count = sprintf(buf, "%d\n", w1_timeout); | |
304 | return count; | |
305 | } | |
306 | ||
c3098356 DK |
307 | static ssize_t w1_master_attribute_show_timeout_us(struct device *dev, |
308 | struct device_attribute *attr, char *buf) | |
309 | { | |
310 | ssize_t count; | |
311 | count = sprintf(buf, "%d\n", w1_timeout_us); | |
312 | return count; | |
313 | } | |
314 | ||
a1613056 DF |
315 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
316 | struct device_attribute *attr, const char *buf, size_t count) | |
317 | { | |
a7155f4e | 318 | int tmp; |
a1613056 DF |
319 | struct w1_master *md = dev_to_w1_master(dev); |
320 | ||
b9c11a23 | 321 | if (kstrtoint(buf, 0, &tmp) || tmp < 1) |
a1613056 DF |
322 | return -EINVAL; |
323 | ||
324 | mutex_lock(&md->mutex); | |
325 | md->max_slave_count = tmp; | |
326 | /* allow each time the max_slave_count is updated */ | |
327 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
328 | mutex_unlock(&md->mutex); | |
329 | ||
330 | return count; | |
331 | } | |
332 | ||
060b8845 | 333 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 334 | { |
db2d0008 | 335 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 336 | ssize_t count; |
7785925d | 337 | |
abd52a13 | 338 | mutex_lock(&md->mutex); |
1da177e4 | 339 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 340 | mutex_unlock(&md->mutex); |
1da177e4 LT |
341 | return count; |
342 | } | |
343 | ||
060b8845 | 344 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 345 | { |
db2d0008 | 346 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 347 | ssize_t count; |
7785925d | 348 | |
abd52a13 | 349 | mutex_lock(&md->mutex); |
1da177e4 | 350 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 351 | mutex_unlock(&md->mutex); |
1da177e4 LT |
352 | return count; |
353 | } | |
354 | ||
060b8845 | 355 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 356 | { |
db2d0008 | 357 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 358 | ssize_t count; |
7785925d | 359 | |
abd52a13 | 360 | mutex_lock(&md->mutex); |
1da177e4 | 361 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 362 | mutex_unlock(&md->mutex); |
1da177e4 LT |
363 | return count; |
364 | } | |
365 | ||
9b467411 DF |
366 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
367 | struct device_attribute *attr, char *buf) | |
1da177e4 | 368 | { |
db2d0008 | 369 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 370 | int c = PAGE_SIZE; |
9fcbbac5 DF |
371 | struct list_head *ent, *n; |
372 | struct w1_slave *sl = NULL; | |
1da177e4 | 373 | |
9fcbbac5 | 374 | mutex_lock(&md->list_mutex); |
1da177e4 | 375 | |
9fcbbac5 DF |
376 | list_for_each_safe(ent, n, &md->slist) { |
377 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
1da177e4 | 378 | |
9fcbbac5 | 379 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 | 380 | } |
9fcbbac5 DF |
381 | if (!sl) |
382 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
1da177e4 | 383 | |
9fcbbac5 | 384 | mutex_unlock(&md->list_mutex); |
1da177e4 LT |
385 | |
386 | return PAGE_SIZE - c; | |
387 | } | |
388 | ||
9b467411 DF |
389 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
390 | struct device_attribute *attr, char *buf) | |
391 | { | |
392 | int c = PAGE_SIZE; | |
393 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
394 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
395 | return PAGE_SIZE - c; | |
396 | } | |
397 | ||
398 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
399 | struct w1_reg_num *rn) | |
400 | { | |
401 | unsigned int family; | |
402 | unsigned long long id; | |
403 | int i; | |
404 | u64 rn64_le; | |
405 | ||
406 | /* The CRC value isn't read from the user because the sysfs directory | |
407 | * doesn't include it and most messages from the bus search don't | |
408 | * print it either. It would be unreasonable for the user to then | |
409 | * provide it. | |
410 | */ | |
411 | const char *error_msg = "bad slave string format, expecting " | |
412 | "ff-dddddddddddd\n"; | |
413 | ||
414 | if (buf[2] != '-') { | |
415 | dev_err(dev, "%s", error_msg); | |
416 | return -EINVAL; | |
417 | } | |
418 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
419 | if (i != 2) { | |
420 | dev_err(dev, "%s", error_msg); | |
421 | return -EINVAL; | |
422 | } | |
423 | rn->family = family; | |
424 | rn->id = id; | |
425 | ||
426 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
427 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
428 | ||
429 | #if 0 | |
430 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
431 | rn->family, (unsigned long long)rn->id, rn->crc); | |
432 | #endif | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
9fcbbac5 | 438 | * Note: must not hold list_mutex |
9b467411 | 439 | */ |
70b34d2e | 440 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
9b467411 DF |
441 | struct w1_reg_num *rn) |
442 | { | |
443 | struct w1_slave *sl; | |
9fcbbac5 | 444 | mutex_lock(&dev->list_mutex); |
9b467411 DF |
445 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
446 | if (sl->reg_num.family == rn->family && | |
447 | sl->reg_num.id == rn->id && | |
448 | sl->reg_num.crc == rn->crc) { | |
9fcbbac5 | 449 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
450 | return sl; |
451 | } | |
452 | } | |
9fcbbac5 | 453 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
454 | return NULL; |
455 | } | |
456 | ||
457 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
458 | struct device_attribute *attr, | |
459 | const char *buf, size_t count) | |
460 | { | |
461 | struct w1_master *md = dev_to_w1_master(dev); | |
462 | struct w1_reg_num rn; | |
463 | struct w1_slave *sl; | |
464 | ssize_t result = count; | |
465 | ||
466 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
467 | return -EINVAL; | |
468 | ||
469 | mutex_lock(&md->mutex); | |
470 | sl = w1_slave_search_device(md, &rn); | |
471 | /* It would be nice to do a targeted search one the one-wire bus | |
472 | * for the new device to see if it is out there or not. But the | |
473 | * current search doesn't support that. | |
474 | */ | |
475 | if (sl) { | |
476 | dev_info(dev, "Device %s already exists\n", sl->name); | |
477 | result = -EINVAL; | |
478 | } else { | |
479 | w1_attach_slave_device(md, &rn); | |
480 | } | |
481 | mutex_unlock(&md->mutex); | |
482 | ||
483 | return result; | |
484 | } | |
485 | ||
486 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
487 | struct device_attribute *attr, char *buf) | |
488 | { | |
489 | int c = PAGE_SIZE; | |
490 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
491 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
492 | return PAGE_SIZE - c; | |
493 | } | |
494 | ||
495 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
496 | struct device_attribute *attr, | |
497 | const char *buf, size_t count) | |
498 | { | |
499 | struct w1_master *md = dev_to_w1_master(dev); | |
500 | struct w1_reg_num rn; | |
501 | struct w1_slave *sl; | |
502 | ssize_t result = count; | |
503 | ||
504 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
505 | return -EINVAL; | |
506 | ||
507 | mutex_lock(&md->mutex); | |
508 | sl = w1_slave_search_device(md, &rn); | |
509 | if (sl) { | |
9fcbbac5 DF |
510 | result = w1_slave_detach(sl); |
511 | /* refcnt 0 means it was detached in the call */ | |
512 | if (result == 0) | |
513 | result = count; | |
9b467411 DF |
514 | } else { |
515 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
516 | (unsigned long long)rn.id); | |
517 | result = -EINVAL; | |
518 | } | |
519 | mutex_unlock(&md->mutex); | |
520 | ||
521 | return result; | |
522 | } | |
523 | ||
7785925d EP |
524 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
525 | struct device_attribute w1_master_attribute_##_name = \ | |
526 | __ATTR(w1_master_##_name, _mode, \ | |
527 | w1_master_attribute_show_##_name, NULL) | |
528 | ||
2a9d0c17 EP |
529 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
530 | struct device_attribute w1_master_attribute_##_name = \ | |
531 | __ATTR(w1_master_##_name, _mode, \ | |
532 | w1_master_attribute_show_##_name, \ | |
533 | w1_master_attribute_store_##_name) | |
534 | ||
7785925d EP |
535 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
536 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
537 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 538 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
539 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
540 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
c3098356 | 541 | static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO); |
7785925d | 542 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
12aa4c64 BS |
543 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
544 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
545 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
546 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
547 | |
548 | static struct attribute *w1_master_default_attrs[] = { | |
549 | &w1_master_attribute_name.attr, | |
550 | &w1_master_attribute_slaves.attr, | |
551 | &w1_master_attribute_slave_count.attr, | |
552 | &w1_master_attribute_max_slave_count.attr, | |
553 | &w1_master_attribute_attempts.attr, | |
554 | &w1_master_attribute_timeout.attr, | |
c3098356 | 555 | &w1_master_attribute_timeout_us.attr, |
7785925d | 556 | &w1_master_attribute_pointer.attr, |
2a9d0c17 | 557 | &w1_master_attribute_search.attr, |
6a158c0d | 558 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
559 | &w1_master_attribute_add.attr, |
560 | &w1_master_attribute_remove.attr, | |
7785925d | 561 | NULL |
1da177e4 LT |
562 | }; |
563 | ||
a890d56a | 564 | static const struct attribute_group w1_master_defattr_group = { |
7785925d | 565 | .attrs = w1_master_default_attrs, |
1da177e4 LT |
566 | }; |
567 | ||
7785925d EP |
568 | int w1_create_master_attributes(struct w1_master *master) |
569 | { | |
570 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
571 | } | |
572 | ||
c30c9b15 | 573 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
574 | { |
575 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
576 | } | |
577 | ||
7eff2e7a | 578 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
579 | { |
580 | struct w1_master *md = NULL; | |
581 | struct w1_slave *sl = NULL; | |
582 | char *event_owner, *name; | |
526be416 | 583 | int err = 0; |
7f772ed8 EP |
584 | |
585 | if (dev->driver == &w1_master_driver) { | |
586 | md = container_of(dev, struct w1_master, dev); | |
587 | event_owner = "master"; | |
588 | name = md->name; | |
589 | } else if (dev->driver == &w1_slave_driver) { | |
590 | sl = container_of(dev, struct w1_slave, dev); | |
591 | event_owner = "slave"; | |
592 | name = sl->name; | |
593 | } else { | |
312c004d | 594 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
595 | return -EINVAL; |
596 | } | |
597 | ||
c6976a4e | 598 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 599 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
600 | |
601 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 602 | goto end; |
7f772ed8 | 603 | |
7eff2e7a | 604 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 605 | if (err) |
526be416 | 606 | goto end; |
7f772ed8 | 607 | |
7eff2e7a KS |
608 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
609 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
610 | end: |
611 | return err; | |
612 | } | |
7f772ed8 | 613 | |
18d7f891 | 614 | static int w1_family_notify(unsigned long action, struct w1_slave *sl) |
47eba33a | 615 | { |
36c27a65 | 616 | struct w1_family_ops *fops; |
47eba33a GKH |
617 | int err; |
618 | ||
36c27a65 | 619 | fops = sl->family->fops; |
47eba33a | 620 | |
2962aece HFV |
621 | if (!fops) |
622 | return 0; | |
623 | ||
47eba33a GKH |
624 | switch (action) { |
625 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 626 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
627 | if (fops->add_slave) { |
628 | err = fops->add_slave(sl); | |
629 | if (err < 0) { | |
630 | dev_err(&sl->dev, | |
631 | "add_slave() call failed. err=%d\n", | |
632 | err); | |
633 | return err; | |
634 | } | |
635 | } | |
636 | if (fops->groups) { | |
637 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
638 | if (err) { | |
639 | dev_err(&sl->dev, | |
640 | "sysfs group creation failed. err=%d\n", | |
641 | err); | |
642 | return err; | |
643 | } | |
47eba33a | 644 | } |
2eb79548 JRN |
645 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info) { |
646 | struct device *hwmon | |
647 | = hwmon_device_register_with_info(&sl->dev, | |
648 | "w1_slave_temp", sl, | |
649 | fops->chip_info, | |
650 | NULL); | |
651 | if (IS_ERR(hwmon)) { | |
652 | dev_warn(&sl->dev, | |
653 | "could not create hwmon device\n"); | |
654 | } else { | |
655 | sl->hwmon = hwmon; | |
656 | } | |
657 | } | |
47eba33a GKH |
658 | break; |
659 | case BUS_NOTIFY_DEL_DEVICE: | |
2eb79548 JRN |
660 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info && |
661 | sl->hwmon) | |
662 | hwmon_device_unregister(sl->hwmon); | |
36c27a65 | 663 | if (fops->remove_slave) |
47eba33a | 664 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
665 | if (fops->groups) |
666 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
667 | break; |
668 | } | |
669 | return 0; | |
670 | } | |
671 | ||
1da177e4 LT |
672 | static int __w1_attach_slave_device(struct w1_slave *sl) |
673 | { | |
674 | int err; | |
675 | ||
676 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 677 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
678 | sl->dev.bus = &w1_bus_type; |
679 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 680 | sl->dev.groups = w1_slave_groups; |
fae68031 DM |
681 | sl->dev.of_node = of_find_matching_node(sl->master->dev.of_node, |
682 | sl->family->of_match_table); | |
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); |
0ec4eb71 | 703 | put_device(&sl->dev); |
1da177e4 LT |
704 | return err; |
705 | } | |
18d7f891 | 706 | w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl); |
1da177e4 | 707 | |
47eba33a GKH |
708 | dev_set_uevent_suppress(&sl->dev, false); |
709 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 | 710 | |
9fcbbac5 | 711 | mutex_lock(&sl->master->list_mutex); |
1da177e4 | 712 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
9fcbbac5 | 713 | mutex_unlock(&sl->master->list_mutex); |
1da177e4 LT |
714 | |
715 | return 0; | |
716 | } | |
717 | ||
70b34d2e | 718 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
1da177e4 LT |
719 | { |
720 | struct w1_slave *sl; | |
721 | struct w1_family *f; | |
722 | int err; | |
723 | struct w1_netlink_msg msg; | |
724 | ||
dd00cc48 | 725 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
726 | if (!sl) { |
727 | dev_err(&dev->dev, | |
728 | "%s: failed to allocate new slave device.\n", | |
729 | __func__); | |
730 | return -ENOMEM; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | |
734 | sl->owner = THIS_MODULE; | |
735 | sl->master = dev; | |
bb670937 | 736 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 737 | |
12003375 | 738 | memset(&msg, 0, sizeof(msg)); |
1da177e4 | 739 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
9fcbbac5 DF |
740 | atomic_set(&sl->refcnt, 1); |
741 | atomic_inc(&sl->master->refcnt); | |
2c927c0c | 742 | dev->slave_count++; |
f6887531 AW |
743 | dev_info(&dev->dev, "Attaching one wire slave %02x.%012llx crc %02x\n", |
744 | rn->family, (unsigned long long)rn->id, rn->crc); | |
1da177e4 | 745 | |
bc04d76d HFV |
746 | /* slave modules need to be loaded in a context with unlocked mutex */ |
747 | mutex_unlock(&dev->mutex); | |
065c0956 | 748 | request_module("w1-family-0x%02X", rn->family); |
bc04d76d | 749 | mutex_lock(&dev->mutex); |
8d7bda51 | 750 | |
1da177e4 LT |
751 | spin_lock(&w1_flock); |
752 | f = w1_family_registered(rn->family); | |
753 | if (!f) { | |
99c5bfe9 | 754 | f= &w1_default_family; |
1da177e4 LT |
755 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
756 | rn->family, rn->family, | |
757 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
758 | } |
759 | __w1_family_get(f); | |
760 | spin_unlock(&w1_flock); | |
761 | ||
762 | sl->family = f; | |
763 | ||
1da177e4 LT |
764 | err = __w1_attach_slave_device(sl); |
765 | if (err < 0) { | |
766 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
767 | sl->name); | |
2c927c0c | 768 | dev->slave_count--; |
1da177e4 | 769 | w1_family_put(sl->family); |
d2ce4ea1 | 770 | atomic_dec(&sl->master->refcnt); |
1da177e4 LT |
771 | kfree(sl); |
772 | return err; | |
773 | } | |
774 | ||
775 | sl->ttl = dev->slave_ttl; | |
1da177e4 | 776 | |
12003375 | 777 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
778 | msg.type = W1_SLAVE_ADD; |
779 | w1_netlink_send(dev, &msg); | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
9fcbbac5 | 784 | int w1_unref_slave(struct w1_slave *sl) |
1da177e4 | 785 | { |
9fcbbac5 DF |
786 | struct w1_master *dev = sl->master; |
787 | int refcnt; | |
788 | mutex_lock(&dev->list_mutex); | |
789 | refcnt = atomic_sub_return(1, &sl->refcnt); | |
790 | if (refcnt == 0) { | |
791 | struct w1_netlink_msg msg; | |
792 | ||
793 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, | |
794 | sl->name, sl); | |
795 | ||
796 | list_del(&sl->w1_slave_entry); | |
797 | ||
798 | memset(&msg, 0, sizeof(msg)); | |
799 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
800 | msg.type = W1_SLAVE_REMOVE; | |
801 | w1_netlink_send(sl->master, &msg); | |
802 | ||
18d7f891 | 803 | w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl); |
9fcbbac5 DF |
804 | device_unregister(&sl->dev); |
805 | #ifdef DEBUG | |
806 | memset(sl, 0, sizeof(*sl)); | |
807 | #endif | |
808 | kfree(sl); | |
809 | } | |
810 | atomic_dec(&dev->refcnt); | |
811 | mutex_unlock(&dev->list_mutex); | |
812 | return refcnt; | |
813 | } | |
1da177e4 | 814 | |
9fcbbac5 DF |
815 | int w1_slave_detach(struct w1_slave *sl) |
816 | { | |
817 | /* Only detach a slave once as it decreases the refcnt each time. */ | |
818 | int destroy_now; | |
819 | mutex_lock(&sl->master->list_mutex); | |
820 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); | |
821 | set_bit(W1_SLAVE_DETACH, &sl->flags); | |
822 | mutex_unlock(&sl->master->list_mutex); | |
823 | ||
824 | if (destroy_now) | |
825 | destroy_now = !w1_unref_slave(sl); | |
826 | return destroy_now ? 0 : -EBUSY; | |
1da177e4 LT |
827 | } |
828 | ||
12003375 EP |
829 | struct w1_master *w1_search_master_id(u32 id) |
830 | { | |
831 | struct w1_master *dev; | |
832 | int found = 0; | |
833 | ||
abd52a13 | 834 | mutex_lock(&w1_mlock); |
12003375 EP |
835 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
836 | if (dev->id == id) { | |
837 | found = 1; | |
838 | atomic_inc(&dev->refcnt); | |
839 | break; | |
840 | } | |
841 | } | |
abd52a13 | 842 | mutex_unlock(&w1_mlock); |
12003375 EP |
843 | |
844 | return (found)?dev:NULL; | |
845 | } | |
846 | ||
847 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
848 | { | |
849 | struct w1_master *dev; | |
850 | struct w1_slave *sl = NULL; | |
851 | int found = 0; | |
852 | ||
abd52a13 | 853 | mutex_lock(&w1_mlock); |
12003375 | 854 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
9fcbbac5 | 855 | mutex_lock(&dev->list_mutex); |
12003375 EP |
856 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
857 | if (sl->reg_num.family == id->family && | |
858 | sl->reg_num.id == id->id && | |
859 | sl->reg_num.crc == id->crc) { | |
860 | found = 1; | |
861 | atomic_inc(&dev->refcnt); | |
862 | atomic_inc(&sl->refcnt); | |
863 | break; | |
864 | } | |
865 | } | |
9fcbbac5 | 866 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
867 | |
868 | if (found) | |
869 | break; | |
870 | } | |
abd52a13 | 871 | mutex_unlock(&w1_mlock); |
12003375 EP |
872 | |
873 | return (found)?sl:NULL; | |
874 | } | |
875 | ||
c30c9b15 | 876 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 877 | { |
c30c9b15 | 878 | struct w1_slave *sl, *sln; |
6adf87bd EP |
879 | struct w1_master *dev; |
880 | ||
abd52a13 | 881 | mutex_lock(&w1_mlock); |
6adf87bd | 882 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
883 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
884 | "for family %02x.\n", dev->name, f->fid); | |
885 | mutex_lock(&dev->mutex); | |
9fcbbac5 | 886 | mutex_lock(&dev->list_mutex); |
c30c9b15 DF |
887 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
888 | /* If it is a new family, slaves with the default | |
889 | * family driver and are that family will be | |
890 | * connected. If the family is going away, devices | |
891 | * matching that family are reconneced. | |
892 | */ | |
893 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
894 | && sl->reg_num.family == f->fid) || | |
895 | (!attach && sl->family->fid == f->fid)) { | |
896 | struct w1_reg_num rn; | |
897 | ||
9fcbbac5 | 898 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 899 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
9fcbbac5 DF |
900 | /* If it was already in use let the automatic |
901 | * scan pick it up again later. | |
902 | */ | |
903 | if (!w1_slave_detach(sl)) | |
904 | w1_attach_slave_device(dev, &rn); | |
905 | mutex_lock(&dev->list_mutex); | |
c30c9b15 DF |
906 | } |
907 | } | |
908 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
909 | "has been finished.\n", dev->name); | |
9fcbbac5 | 910 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 911 | mutex_unlock(&dev->mutex); |
6adf87bd | 912 | } |
abd52a13 | 913 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
914 | } |
915 | ||
963bb101 | 916 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 917 | { |
1da177e4 | 918 | struct w1_slave *sl; |
1da177e4 | 919 | struct w1_reg_num *tmp; |
0e65f828 | 920 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 921 | |
c30c9b15 | 922 | atomic_inc(&dev->refcnt); |
7785925d | 923 | |
1da177e4 LT |
924 | tmp = (struct w1_reg_num *) &rn; |
925 | ||
cd7b28d3 DF |
926 | sl = w1_slave_search_device(dev, tmp); |
927 | if (sl) { | |
bb670937 | 928 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
929 | } else { |
930 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
931 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 932 | } |
7785925d | 933 | |
1da177e4 LT |
934 | atomic_dec(&dev->refcnt); |
935 | } | |
936 | ||
6b729861 | 937 | /** |
b3be177a DF |
938 | * w1_search() - Performs a ROM Search & registers any devices found. |
939 | * @dev: The master device to search | |
940 | * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH | |
941 | * to return only devices in the alarmed state | |
942 | * @cb: Function to call when a device is found | |
943 | * | |
6b729861 EP |
944 | * The 1-wire search is a simple binary tree search. |
945 | * For each bit of the address, we read two bits and write one bit. | |
946 | * The bit written will put to sleep all devies that don't match that bit. | |
947 | * When the two reads differ, the direction choice is obvious. | |
948 | * When both bits are 0, we must choose a path to take. | |
949 | * When we can scan all 64 bits without having to choose a path, we are done. | |
950 | * | |
951 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
952 | * | |
6b729861 | 953 | */ |
12003375 | 954 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 955 | { |
6b729861 EP |
956 | u64 last_rn, rn, tmp64; |
957 | int i, slave_count = 0; | |
958 | int last_zero, last_device; | |
959 | int search_bit, desc_bit; | |
960 | u8 triplet_ret = 0; | |
1da177e4 | 961 | |
6b729861 | 962 | search_bit = 0; |
3c6955e5 DF |
963 | rn = dev->search_id; |
964 | last_rn = 0; | |
6b729861 EP |
965 | last_device = 0; |
966 | last_zero = -1; | |
1da177e4 LT |
967 | |
968 | desc_bit = 64; | |
969 | ||
6b729861 EP |
970 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
971 | last_rn = rn; | |
1da177e4 LT |
972 | rn = 0; |
973 | ||
1da177e4 LT |
974 | /* |
975 | * Reset bus and all 1-wire device state machines | |
976 | * so they can respond to our requests. | |
977 | * | |
978 | * Return 0 - device(s) present, 1 - no devices present. | |
979 | */ | |
b02f8bed | 980 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 981 | if (w1_reset_bus(dev)) { |
b02f8bed | 982 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 983 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
984 | break; |
985 | } | |
986 | ||
c9cbf558 EP |
987 | /* Do fast search on single slave bus */ |
988 | if (dev->max_slave_count == 1) { | |
b02f8bed | 989 | int rv; |
c9cbf558 | 990 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
991 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
992 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 993 | |
b02f8bed | 994 | if (rv == 8 && rn) |
c9cbf558 EP |
995 | cb(dev, rn); |
996 | ||
997 | break; | |
998 | } | |
999 | ||
6b729861 | 1000 | /* Start the search */ |
12003375 | 1001 | w1_write_8(dev, search_type); |
1da177e4 | 1002 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
1003 | /* Determine the direction/search bit */ |
1004 | if (i == desc_bit) | |
1005 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
1006 | else if (i > desc_bit) | |
1007 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 1008 | else |
6b729861 | 1009 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 1010 | |
b3be177a | 1011 | /* Read two bits and write one bit */ |
6b729861 EP |
1012 | triplet_ret = w1_triplet(dev, search_bit); |
1013 | ||
1014 | /* quit if no device responded */ | |
1015 | if ( (triplet_ret & 0x03) == 0x03 ) | |
1016 | break; | |
1da177e4 | 1017 | |
6b729861 EP |
1018 | /* If both directions were valid, and we took the 0 path... */ |
1019 | if (triplet_ret == 0) | |
1020 | last_zero = i; | |
1da177e4 | 1021 | |
6b729861 EP |
1022 | /* extract the direction taken & update the device number */ |
1023 | tmp64 = (triplet_ret >> 2); | |
1024 | rn |= (tmp64 << i); | |
0d671b27 | 1025 | |
42105698 | 1026 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 1027 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 1028 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
1029 | return; |
1030 | } | |
6b729861 | 1031 | } |
b02f8bed | 1032 | mutex_unlock(&dev->bus_mutex); |
7785925d | 1033 | |
6b729861 | 1034 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 1035 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 1036 | last_device = 1; |
3c6955e5 DF |
1037 | dev->search_id = 0; |
1038 | } else { | |
1039 | dev->search_id = rn; | |
1040 | } | |
6b729861 | 1041 | desc_bit = last_zero; |
c30c9b15 | 1042 | cb(dev, rn); |
6b729861 | 1043 | } |
a1613056 DF |
1044 | |
1045 | if (!last_device && slave_count == dev->max_slave_count && | |
1046 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1047 | /* Only max_slave_count will be scanned in a search, |
1048 | * but it will start where it left off next search | |
1049 | * until all ids are identified and then it will start | |
1050 | * over. A continued search will report the previous | |
1051 | * last id as the first id (provided it is still on the | |
1052 | * bus). | |
1053 | */ | |
a1613056 | 1054 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1055 | "will continue next search.\n", __func__, |
a1613056 DF |
1056 | dev->max_slave_count); |
1057 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1058 | } | |
1da177e4 LT |
1059 | } |
1060 | } | |
1061 | ||
963bb101 DF |
1062 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1063 | w1_slave_found_callback cb) | |
12003375 EP |
1064 | { |
1065 | struct w1_slave *sl, *sln; | |
1066 | ||
9fcbbac5 | 1067 | mutex_lock(&dev->list_mutex); |
12003375 | 1068 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
bb670937 | 1069 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
9fcbbac5 | 1070 | mutex_unlock(&dev->list_mutex); |
12003375 | 1071 | |
963bb101 | 1072 | w1_search_devices(dev, search_type, cb); |
12003375 | 1073 | |
9fcbbac5 | 1074 | mutex_lock(&dev->list_mutex); |
12003375 | 1075 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
9fcbbac5 DF |
1076 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
1077 | mutex_unlock(&dev->list_mutex); | |
12003375 | 1078 | w1_slave_detach(sl); |
9fcbbac5 DF |
1079 | mutex_lock(&dev->list_mutex); |
1080 | } | |
bb670937 | 1081 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1082 | sl->ttl = dev->slave_ttl; |
1083 | } | |
9fcbbac5 | 1084 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
1085 | |
1086 | if (dev->search_count > 0) | |
1087 | dev->search_count--; | |
1088 | } | |
1089 | ||
963bb101 DF |
1090 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1091 | { | |
1092 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1093 | } | |
1094 | ||
b3be177a DF |
1095 | /** |
1096 | * w1_process_callbacks() - execute each dev->async_list callback entry | |
1097 | * @dev: w1_master device | |
1098 | * | |
a0f10464 AK |
1099 | * The w1 master list_mutex must be held. |
1100 | * | |
b3be177a DF |
1101 | * Return: 1 if there were commands to executed 0 otherwise |
1102 | */ | |
9fcbbac5 DF |
1103 | int w1_process_callbacks(struct w1_master *dev) |
1104 | { | |
1105 | int ret = 0; | |
1106 | struct w1_async_cmd *async_cmd, *async_n; | |
1107 | ||
1108 | /* The list can be added to in another thread, loop until it is empty */ | |
1109 | while (!list_empty(&dev->async_list)) { | |
1110 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, | |
1111 | async_entry) { | |
1112 | /* drop the lock, if it is a search it can take a long | |
1113 | * time */ | |
1114 | mutex_unlock(&dev->list_mutex); | |
1115 | async_cmd->cb(dev, async_cmd); | |
1116 | ret = 1; | |
1117 | mutex_lock(&dev->list_mutex); | |
1118 | } | |
1119 | } | |
1120 | return ret; | |
1121 | } | |
1122 | ||
1da177e4 LT |
1123 | int w1_process(void *data) |
1124 | { | |
1125 | struct w1_master *dev = (struct w1_master *) data; | |
3c52e4e6 DF |
1126 | /* As long as w1_timeout is only set by a module parameter the sleep |
1127 | * time can be calculated in jiffies once. | |
1128 | */ | |
c3098356 DK |
1129 | const unsigned long jtime = |
1130 | usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us); | |
9fcbbac5 DF |
1131 | /* remainder if it woke up early */ |
1132 | unsigned long jremain = 0; | |
1da177e4 | 1133 | |
9fcbbac5 DF |
1134 | for (;;) { |
1135 | ||
1136 | if (!jremain && dev->search_count) { | |
01e14d6d DF |
1137 | mutex_lock(&dev->mutex); |
1138 | w1_search_process(dev, W1_SEARCH); | |
1139 | mutex_unlock(&dev->mutex); | |
1140 | } | |
1141 | ||
9fcbbac5 DF |
1142 | mutex_lock(&dev->list_mutex); |
1143 | /* Note, w1_process_callback drops the lock while processing, | |
1144 | * but locks it again before returning. | |
1145 | */ | |
1146 | if (!w1_process_callbacks(dev) && jremain) { | |
1147 | /* a wake up is either to stop the thread, process | |
1148 | * callbacks, or search, it isn't process callbacks, so | |
1149 | * schedule a search. | |
1150 | */ | |
1151 | jremain = 1; | |
1152 | } | |
1153 | ||
3c52e4e6 DF |
1154 | __set_current_state(TASK_INTERRUPTIBLE); |
1155 | ||
9fcbbac5 DF |
1156 | /* hold list_mutex until after interruptible to prevent loosing |
1157 | * the wakeup signal when async_cmd is added. | |
1158 | */ | |
1159 | mutex_unlock(&dev->list_mutex); | |
1160 | ||
3c52e4e6 DF |
1161 | if (kthread_should_stop()) |
1162 | break; | |
1163 | ||
1164 | /* Only sleep when the search is active. */ | |
9fcbbac5 DF |
1165 | if (dev->search_count) { |
1166 | if (!jremain) | |
1167 | jremain = jtime; | |
1168 | jremain = schedule_timeout(jremain); | |
1169 | } | |
3c52e4e6 DF |
1170 | else |
1171 | schedule(); | |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
1175 | |
1176 | return 0; | |
1177 | } | |
1178 | ||
73a98fce | 1179 | static int __init w1_init(void) |
1da177e4 LT |
1180 | { |
1181 | int retval; | |
1182 | ||
fdc9167a | 1183 | pr_info("Driver for 1-wire Dallas network protocol.\n"); |
1da177e4 | 1184 | |
12003375 EP |
1185 | w1_init_netlink(); |
1186 | ||
1da177e4 LT |
1187 | retval = bus_register(&w1_bus_type); |
1188 | if (retval) { | |
fdc9167a | 1189 | pr_err("Failed to register bus. err=%d.\n", retval); |
1da177e4 LT |
1190 | goto err_out_exit_init; |
1191 | } | |
1192 | ||
7f772ed8 | 1193 | retval = driver_register(&w1_master_driver); |
1da177e4 | 1194 | if (retval) { |
fdc9167a | 1195 | pr_err("Failed to register master driver. err=%d.\n", |
1da177e4 LT |
1196 | retval); |
1197 | goto err_out_bus_unregister; | |
1198 | } | |
1199 | ||
7f772ed8 EP |
1200 | retval = driver_register(&w1_slave_driver); |
1201 | if (retval) { | |
fdc9167a | 1202 | pr_err("Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1203 | retval); |
1204 | goto err_out_master_unregister; | |
1205 | } | |
1206 | ||
1da177e4 LT |
1207 | return 0; |
1208 | ||
c30c9b15 DF |
1209 | #if 0 |
1210 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1211 | err_out_slave_unregister: |
1212 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1213 | #endif |
7f772ed8 EP |
1214 | |
1215 | err_out_master_unregister: | |
1216 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1217 | |
1218 | err_out_bus_unregister: | |
1219 | bus_unregister(&w1_bus_type); | |
1220 | ||
1221 | err_out_exit_init: | |
1222 | return retval; | |
1223 | } | |
1224 | ||
73a98fce | 1225 | static void __exit w1_fini(void) |
1da177e4 LT |
1226 | { |
1227 | struct w1_master *dev; | |
1da177e4 | 1228 | |
c30c9b15 | 1229 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1230 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1231 | __w1_remove_master_device(dev); |
1da177e4 | 1232 | |
12003375 EP |
1233 | w1_fini_netlink(); |
1234 | ||
7f772ed8 EP |
1235 | driver_unregister(&w1_slave_driver); |
1236 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1237 | bus_unregister(&w1_bus_type); |
1238 | } | |
1239 | ||
1240 | module_init(w1_init); | |
1241 | module_exit(w1_fini); | |
50fa2951 AD |
1242 | |
1243 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); | |
1244 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); | |
1245 | MODULE_LICENSE("GPL"); |