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Commit | Line | Data |
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1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 | 3 | * |
a8018766 | 4 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
7785925d | 5 | * |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/delay.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/sched.h> | |
674a396c | 33 | #include <linux/kthread.h> |
7dfb7103 | 34 | #include <linux/freezer.h> |
1da177e4 | 35 | |
60063497 | 36 | #include <linux/atomic.h> |
1da177e4 LT |
37 | |
38 | #include "w1.h" | |
1da177e4 LT |
39 | #include "w1_log.h" |
40 | #include "w1_int.h" | |
41 | #include "w1_family.h" | |
42 | #include "w1_netlink.h" | |
43 | ||
44 | MODULE_LICENSE("GPL"); | |
a8018766 | 45 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
1da177e4 LT |
46 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); |
47 | ||
48 | static int w1_timeout = 10; | |
a1613056 | 49 | int w1_max_slave_count = 64; |
1da177e4 LT |
50 | int w1_max_slave_ttl = 10; |
51 | ||
52 | module_param_named(timeout, w1_timeout, int, 0); | |
b3be177a DF |
53 | MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); |
54 | /* A search stops when w1_max_slave_count devices have been found in that | |
55 | * search. The next search will start over and detect the same set of devices | |
56 | * on a static 1-wire bus. Memory is not allocated based on this number, just | |
57 | * on the number of devices known to the kernel. Having a high number does not | |
58 | * consume additional resources. As a special case, if there is only one | |
59 | * device on the network and w1_max_slave_count is set to 1, the device id can | |
60 | * be read directly skipping the normal slower search process. | |
61 | */ | |
1da177e4 | 62 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
b3be177a DF |
63 | MODULE_PARM_DESC(max_slave_count, |
64 | "maximum number of slaves detected in a search"); | |
1da177e4 | 65 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
b3be177a DF |
66 | MODULE_PARM_DESC(slave_ttl, |
67 | "Number of searches not seeing a slave before it will be removed"); | |
1da177e4 | 68 | |
abd52a13 | 69 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
70 | LIST_HEAD(w1_masters); |
71 | ||
1da177e4 LT |
72 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
73 | { | |
74 | return 1; | |
75 | } | |
76 | ||
77 | static int w1_master_probe(struct device *dev) | |
78 | { | |
79 | return -ENODEV; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | static void w1_master_release(struct device *dev) |
83 | { | |
db2d0008 | 84 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
85 | |
86 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
87 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
88 | kfree(md); | |
1da177e4 LT |
89 | } |
90 | ||
91 | static void w1_slave_release(struct device *dev) | |
92 | { | |
db2d0008 | 93 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 94 | |
9fcbbac5 | 95 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
3aca692d EP |
96 | |
97 | w1_family_put(sl->family); | |
98 | sl->master->slave_count--; | |
1da177e4 LT |
99 | } |
100 | ||
5b187b3c | 101 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 102 | { |
3aca692d | 103 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 104 | |
3aca692d | 105 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 | 106 | } |
5b187b3c | 107 | static DEVICE_ATTR_RO(name); |
1da177e4 | 108 | |
5b187b3c | 109 | static ssize_t id_show(struct device *dev, |
07e00341 | 110 | struct device_attribute *attr, char *buf) |
1da177e4 | 111 | { |
07e00341 DF |
112 | struct w1_slave *sl = dev_to_w1_slave(dev); |
113 | ssize_t count = sizeof(sl->reg_num); | |
d2a4ef6a | 114 | |
07e00341 | 115 | memcpy(buf, (u8 *)&sl->reg_num, count); |
d2a4ef6a | 116 | return count; |
3aca692d | 117 | } |
5b187b3c | 118 | static DEVICE_ATTR_RO(id); |
d2a4ef6a | 119 | |
5b187b3c GKH |
120 | static struct attribute *w1_slave_attrs[] = { |
121 | &dev_attr_name.attr, | |
122 | &dev_attr_id.attr, | |
123 | NULL, | |
124 | }; | |
125 | ATTRIBUTE_GROUPS(w1_slave); | |
7785925d | 126 | |
d2a4ef6a | 127 | /* Default family */ |
f522d239 | 128 | |
36c27a65 GKH |
129 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
130 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
131 | size_t count) | |
f522d239 EP |
132 | { |
133 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
134 | ||
abd52a13 | 135 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
136 | if (w1_reset_select_slave(sl)) { |
137 | count = 0; | |
138 | goto out_up; | |
139 | } | |
140 | ||
141 | w1_write_block(sl->master, buf, count); | |
142 | ||
143 | out_up: | |
abd52a13 | 144 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
145 | return count; |
146 | } | |
147 | ||
36c27a65 GKH |
148 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
149 | struct bin_attribute *bin_attr, char *buf, loff_t off, | |
150 | size_t count) | |
f522d239 EP |
151 | { |
152 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
153 | ||
abd52a13 | 154 | mutex_lock(&sl->master->mutex); |
f522d239 | 155 | w1_read_block(sl->master, buf, count); |
abd52a13 | 156 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
157 | return count; |
158 | } | |
159 | ||
36c27a65 GKH |
160 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
161 | ||
162 | static struct bin_attribute *w1_slave_bin_attrs[] = { | |
163 | &bin_attr_rw, | |
164 | NULL, | |
f522d239 EP |
165 | }; |
166 | ||
36c27a65 GKH |
167 | static const struct attribute_group w1_slave_default_group = { |
168 | .bin_attrs = w1_slave_bin_attrs, | |
169 | }; | |
f522d239 | 170 | |
36c27a65 GKH |
171 | static const struct attribute_group *w1_slave_default_groups[] = { |
172 | &w1_slave_default_group, | |
173 | NULL, | |
174 | }; | |
f522d239 EP |
175 | |
176 | static struct w1_family_ops w1_default_fops = { | |
36c27a65 | 177 | .groups = w1_slave_default_groups, |
f522d239 EP |
178 | }; |
179 | ||
180 | static struct w1_family w1_default_family = { | |
181 | .fops = &w1_default_fops, | |
182 | }; | |
d2a4ef6a | 183 | |
7eff2e7a | 184 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
7785925d | 185 | |
1da177e4 LT |
186 | static struct bus_type w1_bus_type = { |
187 | .name = "w1", | |
188 | .match = w1_master_match, | |
312c004d | 189 | .uevent = w1_uevent, |
1da177e4 LT |
190 | }; |
191 | ||
7f772ed8 EP |
192 | struct device_driver w1_master_driver = { |
193 | .name = "w1_master_driver", | |
1da177e4 LT |
194 | .bus = &w1_bus_type, |
195 | .probe = w1_master_probe, | |
1da177e4 LT |
196 | }; |
197 | ||
7f772ed8 | 198 | struct device w1_master_device = { |
1da177e4 LT |
199 | .parent = NULL, |
200 | .bus = &w1_bus_type, | |
40f91de6 | 201 | .init_name = "w1 bus master", |
7f772ed8 | 202 | .driver = &w1_master_driver, |
1da177e4 LT |
203 | .release = &w1_master_release |
204 | }; | |
205 | ||
2c5bfdac | 206 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
207 | .name = "w1_slave_driver", |
208 | .bus = &w1_bus_type, | |
209 | }; | |
210 | ||
2c5bfdac | 211 | #if 0 |
7f772ed8 EP |
212 | struct device w1_slave_device = { |
213 | .parent = NULL, | |
214 | .bus = &w1_bus_type, | |
40f91de6 | 215 | .init_name = "w1 bus slave", |
7f772ed8 | 216 | .driver = &w1_slave_driver, |
3aca692d | 217 | .release = &w1_slave_release |
7f772ed8 | 218 | }; |
2c5bfdac | 219 | #endif /* 0 */ |
7f772ed8 | 220 | |
060b8845 | 221 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 222 | { |
db2d0008 | 223 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 224 | ssize_t count; |
7785925d | 225 | |
abd52a13 | 226 | mutex_lock(&md->mutex); |
1da177e4 | 227 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 228 | mutex_unlock(&md->mutex); |
1da177e4 LT |
229 | |
230 | return count; | |
231 | } | |
232 | ||
2a9d0c17 EP |
233 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
234 | struct device_attribute *attr, | |
235 | const char * buf, size_t count) | |
236 | { | |
6a158c0d | 237 | long tmp; |
db2d0008 | 238 | struct w1_master *md = dev_to_w1_master(dev); |
bf4228f0 | 239 | int ret; |
2a9d0c17 | 240 | |
bf4228f0 JH |
241 | ret = kstrtol(buf, 0, &tmp); |
242 | if (ret) | |
243 | return ret; | |
6a158c0d | 244 | |
abd52a13 | 245 | mutex_lock(&md->mutex); |
6a158c0d | 246 | md->search_count = tmp; |
abd52a13 | 247 | mutex_unlock(&md->mutex); |
af8c7237 DF |
248 | /* Only wake if it is going to be searching. */ |
249 | if (tmp) | |
250 | wake_up_process(md->thread); | |
2a9d0c17 EP |
251 | |
252 | return count; | |
253 | } | |
254 | ||
255 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
256 | struct device_attribute *attr, | |
257 | char *buf) | |
258 | { | |
db2d0008 | 259 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
260 | ssize_t count; |
261 | ||
abd52a13 | 262 | mutex_lock(&md->mutex); |
2a9d0c17 | 263 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 264 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
265 | |
266 | return count; | |
267 | } | |
268 | ||
6a158c0d DF |
269 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
270 | struct device_attribute *attr, | |
271 | const char *buf, size_t count) | |
272 | { | |
273 | long tmp; | |
274 | struct w1_master *md = dev_to_w1_master(dev); | |
bf4228f0 | 275 | int ret; |
6a158c0d | 276 | |
bf4228f0 JH |
277 | ret = kstrtol(buf, 0, &tmp); |
278 | if (ret) | |
279 | return ret; | |
6a158c0d DF |
280 | |
281 | mutex_lock(&md->mutex); | |
282 | md->enable_pullup = tmp; | |
283 | mutex_unlock(&md->mutex); | |
6a158c0d DF |
284 | |
285 | return count; | |
286 | } | |
287 | ||
288 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, | |
289 | struct device_attribute *attr, | |
290 | char *buf) | |
291 | { | |
292 | struct w1_master *md = dev_to_w1_master(dev); | |
293 | ssize_t count; | |
294 | ||
295 | mutex_lock(&md->mutex); | |
296 | count = sprintf(buf, "%d\n", md->enable_pullup); | |
297 | mutex_unlock(&md->mutex); | |
298 | ||
299 | return count; | |
300 | } | |
301 | ||
060b8845 | 302 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 303 | { |
db2d0008 | 304 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 305 | ssize_t count; |
7785925d | 306 | |
abd52a13 | 307 | mutex_lock(&md->mutex); |
1da177e4 | 308 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 309 | mutex_unlock(&md->mutex); |
1da177e4 LT |
310 | return count; |
311 | } | |
312 | ||
060b8845 | 313 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
314 | { |
315 | ssize_t count; | |
316 | count = sprintf(buf, "%d\n", w1_timeout); | |
317 | return count; | |
318 | } | |
319 | ||
a1613056 DF |
320 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
321 | struct device_attribute *attr, const char *buf, size_t count) | |
322 | { | |
323 | long tmp; | |
324 | struct w1_master *md = dev_to_w1_master(dev); | |
325 | ||
326 | if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1) | |
327 | return -EINVAL; | |
328 | ||
329 | mutex_lock(&md->mutex); | |
330 | md->max_slave_count = tmp; | |
331 | /* allow each time the max_slave_count is updated */ | |
332 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); | |
333 | mutex_unlock(&md->mutex); | |
334 | ||
335 | return count; | |
336 | } | |
337 | ||
060b8845 | 338 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 339 | { |
db2d0008 | 340 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 341 | ssize_t count; |
7785925d | 342 | |
abd52a13 | 343 | mutex_lock(&md->mutex); |
1da177e4 | 344 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 345 | mutex_unlock(&md->mutex); |
1da177e4 LT |
346 | return count; |
347 | } | |
348 | ||
060b8845 | 349 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 350 | { |
db2d0008 | 351 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 352 | ssize_t count; |
7785925d | 353 | |
abd52a13 | 354 | mutex_lock(&md->mutex); |
1da177e4 | 355 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 356 | mutex_unlock(&md->mutex); |
1da177e4 LT |
357 | return count; |
358 | } | |
359 | ||
060b8845 | 360 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 361 | { |
db2d0008 | 362 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 363 | ssize_t count; |
7785925d | 364 | |
abd52a13 | 365 | mutex_lock(&md->mutex); |
1da177e4 | 366 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 367 | mutex_unlock(&md->mutex); |
1da177e4 LT |
368 | return count; |
369 | } | |
370 | ||
9b467411 DF |
371 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
372 | struct device_attribute *attr, char *buf) | |
1da177e4 | 373 | { |
db2d0008 | 374 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 375 | int c = PAGE_SIZE; |
9fcbbac5 DF |
376 | struct list_head *ent, *n; |
377 | struct w1_slave *sl = NULL; | |
1da177e4 | 378 | |
9fcbbac5 | 379 | mutex_lock(&md->list_mutex); |
1da177e4 | 380 | |
9fcbbac5 DF |
381 | list_for_each_safe(ent, n, &md->slist) { |
382 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
1da177e4 | 383 | |
9fcbbac5 | 384 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 | 385 | } |
9fcbbac5 DF |
386 | if (!sl) |
387 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
1da177e4 | 388 | |
9fcbbac5 | 389 | mutex_unlock(&md->list_mutex); |
1da177e4 LT |
390 | |
391 | return PAGE_SIZE - c; | |
392 | } | |
393 | ||
9b467411 DF |
394 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
395 | struct device_attribute *attr, char *buf) | |
396 | { | |
397 | int c = PAGE_SIZE; | |
398 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
399 | "write device id xx-xxxxxxxxxxxx to add slave\n"); | |
400 | return PAGE_SIZE - c; | |
401 | } | |
402 | ||
403 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, | |
404 | struct w1_reg_num *rn) | |
405 | { | |
406 | unsigned int family; | |
407 | unsigned long long id; | |
408 | int i; | |
409 | u64 rn64_le; | |
410 | ||
411 | /* The CRC value isn't read from the user because the sysfs directory | |
412 | * doesn't include it and most messages from the bus search don't | |
413 | * print it either. It would be unreasonable for the user to then | |
414 | * provide it. | |
415 | */ | |
416 | const char *error_msg = "bad slave string format, expecting " | |
417 | "ff-dddddddddddd\n"; | |
418 | ||
419 | if (buf[2] != '-') { | |
420 | dev_err(dev, "%s", error_msg); | |
421 | return -EINVAL; | |
422 | } | |
423 | i = sscanf(buf, "%02x-%012llx", &family, &id); | |
424 | if (i != 2) { | |
425 | dev_err(dev, "%s", error_msg); | |
426 | return -EINVAL; | |
427 | } | |
428 | rn->family = family; | |
429 | rn->id = id; | |
430 | ||
431 | rn64_le = cpu_to_le64(*(u64 *)rn); | |
432 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); | |
433 | ||
434 | #if 0 | |
435 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", | |
436 | rn->family, (unsigned long long)rn->id, rn->crc); | |
437 | #endif | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | /* Searches the slaves in the w1_master and returns a pointer or NULL. | |
9fcbbac5 | 443 | * Note: must not hold list_mutex |
9b467411 | 444 | */ |
70b34d2e | 445 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
9b467411 DF |
446 | struct w1_reg_num *rn) |
447 | { | |
448 | struct w1_slave *sl; | |
9fcbbac5 | 449 | mutex_lock(&dev->list_mutex); |
9b467411 DF |
450 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
451 | if (sl->reg_num.family == rn->family && | |
452 | sl->reg_num.id == rn->id && | |
453 | sl->reg_num.crc == rn->crc) { | |
9fcbbac5 | 454 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
455 | return sl; |
456 | } | |
457 | } | |
9fcbbac5 | 458 | mutex_unlock(&dev->list_mutex); |
9b467411 DF |
459 | return NULL; |
460 | } | |
461 | ||
462 | static ssize_t w1_master_attribute_store_add(struct device *dev, | |
463 | struct device_attribute *attr, | |
464 | const char *buf, size_t count) | |
465 | { | |
466 | struct w1_master *md = dev_to_w1_master(dev); | |
467 | struct w1_reg_num rn; | |
468 | struct w1_slave *sl; | |
469 | ssize_t result = count; | |
470 | ||
471 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
472 | return -EINVAL; | |
473 | ||
474 | mutex_lock(&md->mutex); | |
475 | sl = w1_slave_search_device(md, &rn); | |
476 | /* It would be nice to do a targeted search one the one-wire bus | |
477 | * for the new device to see if it is out there or not. But the | |
478 | * current search doesn't support that. | |
479 | */ | |
480 | if (sl) { | |
481 | dev_info(dev, "Device %s already exists\n", sl->name); | |
482 | result = -EINVAL; | |
483 | } else { | |
484 | w1_attach_slave_device(md, &rn); | |
485 | } | |
486 | mutex_unlock(&md->mutex); | |
487 | ||
488 | return result; | |
489 | } | |
490 | ||
491 | static ssize_t w1_master_attribute_show_remove(struct device *dev, | |
492 | struct device_attribute *attr, char *buf) | |
493 | { | |
494 | int c = PAGE_SIZE; | |
495 | c -= snprintf(buf+PAGE_SIZE - c, c, | |
496 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); | |
497 | return PAGE_SIZE - c; | |
498 | } | |
499 | ||
500 | static ssize_t w1_master_attribute_store_remove(struct device *dev, | |
501 | struct device_attribute *attr, | |
502 | const char *buf, size_t count) | |
503 | { | |
504 | struct w1_master *md = dev_to_w1_master(dev); | |
505 | struct w1_reg_num rn; | |
506 | struct w1_slave *sl; | |
507 | ssize_t result = count; | |
508 | ||
509 | if (w1_atoreg_num(dev, buf, count, &rn)) | |
510 | return -EINVAL; | |
511 | ||
512 | mutex_lock(&md->mutex); | |
513 | sl = w1_slave_search_device(md, &rn); | |
514 | if (sl) { | |
9fcbbac5 DF |
515 | result = w1_slave_detach(sl); |
516 | /* refcnt 0 means it was detached in the call */ | |
517 | if (result == 0) | |
518 | result = count; | |
9b467411 DF |
519 | } else { |
520 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, | |
521 | (unsigned long long)rn.id); | |
522 | result = -EINVAL; | |
523 | } | |
524 | mutex_unlock(&md->mutex); | |
525 | ||
526 | return result; | |
527 | } | |
528 | ||
7785925d EP |
529 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
530 | struct device_attribute w1_master_attribute_##_name = \ | |
531 | __ATTR(w1_master_##_name, _mode, \ | |
532 | w1_master_attribute_show_##_name, NULL) | |
533 | ||
2a9d0c17 EP |
534 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
535 | struct device_attribute w1_master_attribute_##_name = \ | |
536 | __ATTR(w1_master_##_name, _mode, \ | |
537 | w1_master_attribute_show_##_name, \ | |
538 | w1_master_attribute_store_##_name) | |
539 | ||
7785925d EP |
540 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
541 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
542 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
a1613056 | 543 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925d EP |
544 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
545 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
546 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
12aa4c64 BS |
547 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
548 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); | |
549 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); | |
550 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); | |
7785925d EP |
551 | |
552 | static struct attribute *w1_master_default_attrs[] = { | |
553 | &w1_master_attribute_name.attr, | |
554 | &w1_master_attribute_slaves.attr, | |
555 | &w1_master_attribute_slave_count.attr, | |
556 | &w1_master_attribute_max_slave_count.attr, | |
557 | &w1_master_attribute_attempts.attr, | |
558 | &w1_master_attribute_timeout.attr, | |
559 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 560 | &w1_master_attribute_search.attr, |
6a158c0d | 561 | &w1_master_attribute_pullup.attr, |
9b467411 DF |
562 | &w1_master_attribute_add.attr, |
563 | &w1_master_attribute_remove.attr, | |
7785925d | 564 | NULL |
1da177e4 LT |
565 | }; |
566 | ||
7785925d EP |
567 | static struct attribute_group w1_master_defattr_group = { |
568 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
569 | }; |
570 | ||
7785925d EP |
571 | int w1_create_master_attributes(struct w1_master *master) |
572 | { | |
573 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
574 | } | |
575 | ||
c30c9b15 | 576 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
577 | { |
578 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
579 | } | |
580 | ||
7eff2e7a | 581 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8 EP |
582 | { |
583 | struct w1_master *md = NULL; | |
584 | struct w1_slave *sl = NULL; | |
585 | char *event_owner, *name; | |
526be416 | 586 | int err = 0; |
7f772ed8 EP |
587 | |
588 | if (dev->driver == &w1_master_driver) { | |
589 | md = container_of(dev, struct w1_master, dev); | |
590 | event_owner = "master"; | |
591 | name = md->name; | |
592 | } else if (dev->driver == &w1_slave_driver) { | |
593 | sl = container_of(dev, struct w1_slave, dev); | |
594 | event_owner = "slave"; | |
595 | name = sl->name; | |
596 | } else { | |
312c004d | 597 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
598 | return -EINVAL; |
599 | } | |
600 | ||
c6976a4e | 601 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
40f91de6 | 602 | event_owner, name, dev_name(dev)); |
7f772ed8 EP |
603 | |
604 | if (dev->driver != &w1_slave_driver || !sl) | |
526be416 | 605 | goto end; |
7f772ed8 | 606 | |
7eff2e7a | 607 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 | 608 | if (err) |
526be416 | 609 | goto end; |
7f772ed8 | 610 | |
7eff2e7a KS |
611 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
612 | (unsigned long long)sl->reg_num.id); | |
526be416 DN |
613 | end: |
614 | return err; | |
615 | } | |
7f772ed8 | 616 | |
47eba33a GKH |
617 | /* |
618 | * Handle sysfs file creation and removal here, before userspace is told that | |
619 | * the device is added / removed from the system | |
620 | */ | |
621 | static int w1_bus_notify(struct notifier_block *nb, unsigned long action, | |
622 | void *data) | |
623 | { | |
624 | struct device *dev = data; | |
625 | struct w1_slave *sl; | |
36c27a65 | 626 | struct w1_family_ops *fops; |
47eba33a GKH |
627 | int err; |
628 | ||
629 | /* | |
630 | * Only care about slave devices at the moment. Yes, we should use a | |
631 | * separate "type" for this, but for now, look at the release function | |
632 | * to know which type it is... | |
633 | */ | |
634 | if (dev->release != w1_slave_release) | |
635 | return 0; | |
636 | ||
637 | sl = dev_to_w1_slave(dev); | |
36c27a65 | 638 | fops = sl->family->fops; |
47eba33a | 639 | |
2962aece HFV |
640 | if (!fops) |
641 | return 0; | |
642 | ||
47eba33a GKH |
643 | switch (action) { |
644 | case BUS_NOTIFY_ADD_DEVICE: | |
47eba33a | 645 | /* if the family driver needs to initialize something... */ |
36c27a65 GKH |
646 | if (fops->add_slave) { |
647 | err = fops->add_slave(sl); | |
648 | if (err < 0) { | |
649 | dev_err(&sl->dev, | |
650 | "add_slave() call failed. err=%d\n", | |
651 | err); | |
652 | return err; | |
653 | } | |
654 | } | |
655 | if (fops->groups) { | |
656 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); | |
657 | if (err) { | |
658 | dev_err(&sl->dev, | |
659 | "sysfs group creation failed. err=%d\n", | |
660 | err); | |
661 | return err; | |
662 | } | |
47eba33a GKH |
663 | } |
664 | ||
665 | break; | |
666 | case BUS_NOTIFY_DEL_DEVICE: | |
36c27a65 | 667 | if (fops->remove_slave) |
47eba33a | 668 | sl->family->fops->remove_slave(sl); |
36c27a65 GKH |
669 | if (fops->groups) |
670 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); | |
47eba33a GKH |
671 | break; |
672 | } | |
673 | return 0; | |
674 | } | |
675 | ||
676 | static struct notifier_block w1_bus_nb = { | |
677 | .notifier_call = w1_bus_notify, | |
678 | }; | |
679 | ||
1da177e4 LT |
680 | static int __w1_attach_slave_device(struct w1_slave *sl) |
681 | { | |
682 | int err; | |
683 | ||
684 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 685 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
686 | sl->dev.bus = &w1_bus_type; |
687 | sl->dev.release = &w1_slave_release; | |
5b187b3c | 688 | sl->dev.groups = w1_slave_groups; |
1da177e4 | 689 | |
40f91de6 | 690 | dev_set_name(&sl->dev, "%02x-%012llx", |
6b729861 EP |
691 | (unsigned int) sl->reg_num.family, |
692 | (unsigned long long) sl->reg_num.id); | |
693 | snprintf(&sl->name[0], sizeof(sl->name), | |
694 | "%02x-%012llx", | |
695 | (unsigned int) sl->reg_num.family, | |
696 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 697 | |
c6976a4e | 698 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
40f91de6 | 699 | dev_name(&sl->dev), sl); |
1da177e4 LT |
700 | |
701 | err = device_register(&sl->dev); | |
702 | if (err < 0) { | |
703 | dev_err(&sl->dev, | |
6b729861 | 704 | "Device registration [%s] failed. err=%d\n", |
40f91de6 | 705 | dev_name(&sl->dev), err); |
1da177e4 LT |
706 | return err; |
707 | } | |
708 | ||
1da177e4 | 709 | |
47eba33a GKH |
710 | dev_set_uevent_suppress(&sl->dev, false); |
711 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); | |
1da177e4 | 712 | |
9fcbbac5 | 713 | mutex_lock(&sl->master->list_mutex); |
1da177e4 | 714 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
9fcbbac5 | 715 | mutex_unlock(&sl->master->list_mutex); |
1da177e4 LT |
716 | |
717 | return 0; | |
718 | } | |
719 | ||
70b34d2e | 720 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
1da177e4 LT |
721 | { |
722 | struct w1_slave *sl; | |
723 | struct w1_family *f; | |
724 | int err; | |
725 | struct w1_netlink_msg msg; | |
726 | ||
dd00cc48 | 727 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
728 | if (!sl) { |
729 | dev_err(&dev->dev, | |
730 | "%s: failed to allocate new slave device.\n", | |
731 | __func__); | |
732 | return -ENOMEM; | |
733 | } | |
734 | ||
1da177e4 LT |
735 | |
736 | sl->owner = THIS_MODULE; | |
737 | sl->master = dev; | |
bb670937 | 738 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
1da177e4 | 739 | |
12003375 | 740 | memset(&msg, 0, sizeof(msg)); |
1da177e4 | 741 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
9fcbbac5 DF |
742 | atomic_set(&sl->refcnt, 1); |
743 | atomic_inc(&sl->master->refcnt); | |
1da177e4 | 744 | |
bc04d76d HFV |
745 | /* slave modules need to be loaded in a context with unlocked mutex */ |
746 | mutex_unlock(&dev->mutex); | |
8d7bda51 | 747 | request_module("w1-family-0x%0x", rn->family); |
bc04d76d | 748 | mutex_lock(&dev->mutex); |
8d7bda51 | 749 | |
1da177e4 LT |
750 | spin_lock(&w1_flock); |
751 | f = w1_family_registered(rn->family); | |
752 | if (!f) { | |
99c5bfe9 | 753 | f= &w1_default_family; |
1da177e4 LT |
754 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
755 | rn->family, rn->family, | |
756 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
757 | } |
758 | __w1_family_get(f); | |
759 | spin_unlock(&w1_flock); | |
760 | ||
761 | sl->family = f; | |
762 | ||
763 | ||
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); | |
768 | w1_family_put(sl->family); | |
769 | kfree(sl); | |
770 | return err; | |
771 | } | |
772 | ||
773 | sl->ttl = dev->slave_ttl; | |
774 | dev->slave_count++; | |
775 | ||
12003375 | 776 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
777 | msg.type = W1_SLAVE_ADD; |
778 | w1_netlink_send(dev, &msg); | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
9fcbbac5 | 783 | int w1_unref_slave(struct w1_slave *sl) |
1da177e4 | 784 | { |
9fcbbac5 DF |
785 | struct w1_master *dev = sl->master; |
786 | int refcnt; | |
787 | mutex_lock(&dev->list_mutex); | |
788 | refcnt = atomic_sub_return(1, &sl->refcnt); | |
789 | if (refcnt == 0) { | |
790 | struct w1_netlink_msg msg; | |
791 | ||
792 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, | |
793 | sl->name, sl); | |
794 | ||
795 | list_del(&sl->w1_slave_entry); | |
796 | ||
797 | memset(&msg, 0, sizeof(msg)); | |
798 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
799 | msg.type = W1_SLAVE_REMOVE; | |
800 | w1_netlink_send(sl->master, &msg); | |
801 | ||
802 | device_unregister(&sl->dev); | |
803 | #ifdef DEBUG | |
804 | memset(sl, 0, sizeof(*sl)); | |
805 | #endif | |
806 | kfree(sl); | |
807 | } | |
808 | atomic_dec(&dev->refcnt); | |
809 | mutex_unlock(&dev->list_mutex); | |
810 | return refcnt; | |
811 | } | |
1da177e4 | 812 | |
9fcbbac5 DF |
813 | int w1_slave_detach(struct w1_slave *sl) |
814 | { | |
815 | /* Only detach a slave once as it decreases the refcnt each time. */ | |
816 | int destroy_now; | |
817 | mutex_lock(&sl->master->list_mutex); | |
818 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); | |
819 | set_bit(W1_SLAVE_DETACH, &sl->flags); | |
820 | mutex_unlock(&sl->master->list_mutex); | |
821 | ||
822 | if (destroy_now) | |
823 | destroy_now = !w1_unref_slave(sl); | |
824 | return destroy_now ? 0 : -EBUSY; | |
1da177e4 LT |
825 | } |
826 | ||
12003375 EP |
827 | struct w1_master *w1_search_master_id(u32 id) |
828 | { | |
829 | struct w1_master *dev; | |
830 | int found = 0; | |
831 | ||
abd52a13 | 832 | mutex_lock(&w1_mlock); |
12003375 EP |
833 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
834 | if (dev->id == id) { | |
835 | found = 1; | |
836 | atomic_inc(&dev->refcnt); | |
837 | break; | |
838 | } | |
839 | } | |
abd52a13 | 840 | mutex_unlock(&w1_mlock); |
12003375 EP |
841 | |
842 | return (found)?dev:NULL; | |
843 | } | |
844 | ||
845 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
846 | { | |
847 | struct w1_master *dev; | |
848 | struct w1_slave *sl = NULL; | |
849 | int found = 0; | |
850 | ||
abd52a13 | 851 | mutex_lock(&w1_mlock); |
12003375 | 852 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
9fcbbac5 | 853 | mutex_lock(&dev->list_mutex); |
12003375 EP |
854 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
855 | if (sl->reg_num.family == id->family && | |
856 | sl->reg_num.id == id->id && | |
857 | sl->reg_num.crc == id->crc) { | |
858 | found = 1; | |
859 | atomic_inc(&dev->refcnt); | |
860 | atomic_inc(&sl->refcnt); | |
861 | break; | |
862 | } | |
863 | } | |
9fcbbac5 | 864 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
865 | |
866 | if (found) | |
867 | break; | |
868 | } | |
abd52a13 | 869 | mutex_unlock(&w1_mlock); |
12003375 EP |
870 | |
871 | return (found)?sl:NULL; | |
872 | } | |
873 | ||
c30c9b15 | 874 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd | 875 | { |
c30c9b15 | 876 | struct w1_slave *sl, *sln; |
6adf87bd EP |
877 | struct w1_master *dev; |
878 | ||
abd52a13 | 879 | mutex_lock(&w1_mlock); |
6adf87bd | 880 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b15 DF |
881 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
882 | "for family %02x.\n", dev->name, f->fid); | |
883 | mutex_lock(&dev->mutex); | |
9fcbbac5 | 884 | mutex_lock(&dev->list_mutex); |
c30c9b15 DF |
885 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
886 | /* If it is a new family, slaves with the default | |
887 | * family driver and are that family will be | |
888 | * connected. If the family is going away, devices | |
889 | * matching that family are reconneced. | |
890 | */ | |
891 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT | |
892 | && sl->reg_num.family == f->fid) || | |
893 | (!attach && sl->family->fid == f->fid)) { | |
894 | struct w1_reg_num rn; | |
895 | ||
9fcbbac5 | 896 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 897 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
9fcbbac5 DF |
898 | /* If it was already in use let the automatic |
899 | * scan pick it up again later. | |
900 | */ | |
901 | if (!w1_slave_detach(sl)) | |
902 | w1_attach_slave_device(dev, &rn); | |
903 | mutex_lock(&dev->list_mutex); | |
c30c9b15 DF |
904 | } |
905 | } | |
906 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " | |
907 | "has been finished.\n", dev->name); | |
9fcbbac5 | 908 | mutex_unlock(&dev->list_mutex); |
c30c9b15 | 909 | mutex_unlock(&dev->mutex); |
6adf87bd | 910 | } |
abd52a13 | 911 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
912 | } |
913 | ||
963bb101 | 914 | void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4 | 915 | { |
1da177e4 | 916 | struct w1_slave *sl; |
1da177e4 | 917 | struct w1_reg_num *tmp; |
0e65f828 | 918 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 | 919 | |
c30c9b15 | 920 | atomic_inc(&dev->refcnt); |
7785925d | 921 | |
1da177e4 LT |
922 | tmp = (struct w1_reg_num *) &rn; |
923 | ||
cd7b28d3 DF |
924 | sl = w1_slave_search_device(dev, tmp); |
925 | if (sl) { | |
bb670937 | 926 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
cd7b28d3 DF |
927 | } else { |
928 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) | |
929 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 930 | } |
7785925d | 931 | |
1da177e4 LT |
932 | atomic_dec(&dev->refcnt); |
933 | } | |
934 | ||
6b729861 | 935 | /** |
b3be177a DF |
936 | * w1_search() - Performs a ROM Search & registers any devices found. |
937 | * @dev: The master device to search | |
938 | * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH | |
939 | * to return only devices in the alarmed state | |
940 | * @cb: Function to call when a device is found | |
941 | * | |
6b729861 EP |
942 | * The 1-wire search is a simple binary tree search. |
943 | * For each bit of the address, we read two bits and write one bit. | |
944 | * The bit written will put to sleep all devies that don't match that bit. | |
945 | * When the two reads differ, the direction choice is obvious. | |
946 | * When both bits are 0, we must choose a path to take. | |
947 | * When we can scan all 64 bits without having to choose a path, we are done. | |
948 | * | |
949 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
950 | * | |
6b729861 | 951 | */ |
12003375 | 952 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 953 | { |
6b729861 EP |
954 | u64 last_rn, rn, tmp64; |
955 | int i, slave_count = 0; | |
956 | int last_zero, last_device; | |
957 | int search_bit, desc_bit; | |
958 | u8 triplet_ret = 0; | |
1da177e4 | 959 | |
6b729861 | 960 | search_bit = 0; |
3c6955e5 DF |
961 | rn = dev->search_id; |
962 | last_rn = 0; | |
6b729861 EP |
963 | last_device = 0; |
964 | last_zero = -1; | |
1da177e4 LT |
965 | |
966 | desc_bit = 64; | |
967 | ||
6b729861 EP |
968 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
969 | last_rn = rn; | |
1da177e4 LT |
970 | rn = 0; |
971 | ||
1da177e4 LT |
972 | /* |
973 | * Reset bus and all 1-wire device state machines | |
974 | * so they can respond to our requests. | |
975 | * | |
976 | * Return 0 - device(s) present, 1 - no devices present. | |
977 | */ | |
b02f8bed | 978 | mutex_lock(&dev->bus_mutex); |
1da177e4 | 979 | if (w1_reset_bus(dev)) { |
b02f8bed | 980 | mutex_unlock(&dev->bus_mutex); |
2da5bf80 | 981 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
982 | break; |
983 | } | |
984 | ||
c9cbf558 EP |
985 | /* Do fast search on single slave bus */ |
986 | if (dev->max_slave_count == 1) { | |
b02f8bed | 987 | int rv; |
c9cbf558 | 988 | w1_write_8(dev, W1_READ_ROM); |
b02f8bed N |
989 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
990 | mutex_unlock(&dev->bus_mutex); | |
c9cbf558 | 991 | |
b02f8bed | 992 | if (rv == 8 && rn) |
c9cbf558 EP |
993 | cb(dev, rn); |
994 | ||
995 | break; | |
996 | } | |
997 | ||
6b729861 | 998 | /* Start the search */ |
12003375 | 999 | w1_write_8(dev, search_type); |
1da177e4 | 1000 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
1001 | /* Determine the direction/search bit */ |
1002 | if (i == desc_bit) | |
1003 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
1004 | else if (i > desc_bit) | |
1005 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 1006 | else |
6b729861 | 1007 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 1008 | |
b3be177a | 1009 | /* Read two bits and write one bit */ |
6b729861 EP |
1010 | triplet_ret = w1_triplet(dev, search_bit); |
1011 | ||
1012 | /* quit if no device responded */ | |
1013 | if ( (triplet_ret & 0x03) == 0x03 ) | |
1014 | break; | |
1da177e4 | 1015 | |
6b729861 EP |
1016 | /* If both directions were valid, and we took the 0 path... */ |
1017 | if (triplet_ret == 0) | |
1018 | last_zero = i; | |
1da177e4 | 1019 | |
6b729861 EP |
1020 | /* extract the direction taken & update the device number */ |
1021 | tmp64 = (triplet_ret >> 2); | |
1022 | rn |= (tmp64 << i); | |
0d671b27 | 1023 | |
42105698 | 1024 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
b02f8bed | 1025 | mutex_unlock(&dev->bus_mutex); |
7dc8f527 | 1026 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
0d671b27 DF |
1027 | return; |
1028 | } | |
6b729861 | 1029 | } |
b02f8bed | 1030 | mutex_unlock(&dev->bus_mutex); |
7785925d | 1031 | |
6b729861 | 1032 | if ( (triplet_ret & 0x03) != 0x03 ) { |
3c6955e5 | 1033 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
6b729861 | 1034 | last_device = 1; |
3c6955e5 DF |
1035 | dev->search_id = 0; |
1036 | } else { | |
1037 | dev->search_id = rn; | |
1038 | } | |
6b729861 | 1039 | desc_bit = last_zero; |
c30c9b15 | 1040 | cb(dev, rn); |
6b729861 | 1041 | } |
a1613056 DF |
1042 | |
1043 | if (!last_device && slave_count == dev->max_slave_count && | |
1044 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { | |
3c6955e5 DF |
1045 | /* Only max_slave_count will be scanned in a search, |
1046 | * but it will start where it left off next search | |
1047 | * until all ids are identified and then it will start | |
1048 | * over. A continued search will report the previous | |
1049 | * last id as the first id (provided it is still on the | |
1050 | * bus). | |
1051 | */ | |
a1613056 | 1052 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
3c6955e5 | 1053 | "will continue next search.\n", __func__, |
a1613056 DF |
1054 | dev->max_slave_count); |
1055 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); | |
1056 | } | |
1da177e4 LT |
1057 | } |
1058 | } | |
1059 | ||
963bb101 DF |
1060 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
1061 | w1_slave_found_callback cb) | |
12003375 EP |
1062 | { |
1063 | struct w1_slave *sl, *sln; | |
1064 | ||
9fcbbac5 | 1065 | mutex_lock(&dev->list_mutex); |
12003375 | 1066 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
bb670937 | 1067 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
9fcbbac5 | 1068 | mutex_unlock(&dev->list_mutex); |
12003375 | 1069 | |
963bb101 | 1070 | w1_search_devices(dev, search_type, cb); |
12003375 | 1071 | |
9fcbbac5 | 1072 | mutex_lock(&dev->list_mutex); |
12003375 | 1073 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
9fcbbac5 DF |
1074 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
1075 | mutex_unlock(&dev->list_mutex); | |
12003375 | 1076 | w1_slave_detach(sl); |
9fcbbac5 DF |
1077 | mutex_lock(&dev->list_mutex); |
1078 | } | |
bb670937 | 1079 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
12003375 EP |
1080 | sl->ttl = dev->slave_ttl; |
1081 | } | |
9fcbbac5 | 1082 | mutex_unlock(&dev->list_mutex); |
12003375 EP |
1083 | |
1084 | if (dev->search_count > 0) | |
1085 | dev->search_count--; | |
1086 | } | |
1087 | ||
963bb101 DF |
1088 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
1089 | { | |
1090 | w1_search_process_cb(dev, search_type, w1_slave_found); | |
1091 | } | |
1092 | ||
b3be177a DF |
1093 | /** |
1094 | * w1_process_callbacks() - execute each dev->async_list callback entry | |
1095 | * @dev: w1_master device | |
1096 | * | |
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 | */ | |
1125 | const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); | |
9fcbbac5 DF |
1126 | /* remainder if it woke up early */ |
1127 | unsigned long jremain = 0; | |
1da177e4 | 1128 | |
9fcbbac5 DF |
1129 | for (;;) { |
1130 | ||
1131 | if (!jremain && dev->search_count) { | |
01e14d6d DF |
1132 | mutex_lock(&dev->mutex); |
1133 | w1_search_process(dev, W1_SEARCH); | |
1134 | mutex_unlock(&dev->mutex); | |
1135 | } | |
1136 | ||
9fcbbac5 DF |
1137 | mutex_lock(&dev->list_mutex); |
1138 | /* Note, w1_process_callback drops the lock while processing, | |
1139 | * but locks it again before returning. | |
1140 | */ | |
1141 | if (!w1_process_callbacks(dev) && jremain) { | |
1142 | /* a wake up is either to stop the thread, process | |
1143 | * callbacks, or search, it isn't process callbacks, so | |
1144 | * schedule a search. | |
1145 | */ | |
1146 | jremain = 1; | |
1147 | } | |
1148 | ||
3e1d1d28 | 1149 | try_to_freeze(); |
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 | ||
1179 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
1180 | ||
12003375 EP |
1181 | w1_init_netlink(); |
1182 | ||
1da177e4 LT |
1183 | retval = bus_register(&w1_bus_type); |
1184 | if (retval) { | |
1185 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
1186 | goto err_out_exit_init; | |
1187 | } | |
1188 | ||
47eba33a GKH |
1189 | retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb); |
1190 | if (retval) | |
1191 | goto err_out_bus_unregister; | |
1192 | ||
7f772ed8 | 1193 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
1194 | if (retval) { |
1195 | printk(KERN_ERR | |
1196 | "Failed to register master driver. err=%d.\n", | |
1197 | retval); | |
1198 | goto err_out_bus_unregister; | |
1199 | } | |
1200 | ||
7f772ed8 EP |
1201 | retval = driver_register(&w1_slave_driver); |
1202 | if (retval) { | |
1203 | printk(KERN_ERR | |
ecf19489 | 1204 | "Failed to register slave driver. err=%d.\n", |
7f772ed8 EP |
1205 | retval); |
1206 | goto err_out_master_unregister; | |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | return 0; |
1210 | ||
c30c9b15 DF |
1211 | #if 0 |
1212 | /* For undoing the slave register if there was a step after it. */ | |
7f772ed8 EP |
1213 | err_out_slave_unregister: |
1214 | driver_unregister(&w1_slave_driver); | |
c30c9b15 | 1215 | #endif |
7f772ed8 EP |
1216 | |
1217 | err_out_master_unregister: | |
1218 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1219 | |
1220 | err_out_bus_unregister: | |
1221 | bus_unregister(&w1_bus_type); | |
1222 | ||
1223 | err_out_exit_init: | |
1224 | return retval; | |
1225 | } | |
1226 | ||
73a98fce | 1227 | static void __exit w1_fini(void) |
1da177e4 LT |
1228 | { |
1229 | struct w1_master *dev; | |
1da177e4 | 1230 | |
c30c9b15 | 1231 | /* Set netlink removal messages and some cleanup */ |
7785925d | 1232 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 1233 | __w1_remove_master_device(dev); |
1da177e4 | 1234 | |
12003375 EP |
1235 | w1_fini_netlink(); |
1236 | ||
7f772ed8 EP |
1237 | driver_unregister(&w1_slave_driver); |
1238 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1239 | bus_unregister(&w1_bus_type); |
1240 | } | |
1241 | ||
1242 | module_init(w1_init); | |
1243 | module_exit(w1_fini); |