]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
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> | |
33 | ||
34 | #include <asm/atomic.h> | |
35 | ||
36 | #include "w1.h" | |
37 | #include "w1_io.h" | |
38 | #include "w1_log.h" | |
39 | #include "w1_int.h" | |
40 | #include "w1_family.h" | |
41 | #include "w1_netlink.h" | |
42 | ||
43 | MODULE_LICENSE("GPL"); | |
44 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); | |
45 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); | |
46 | ||
47 | static int w1_timeout = 10; | |
3aca692d | 48 | static int w1_control_timeout = 1; |
1da177e4 LT |
49 | int w1_max_slave_count = 10; |
50 | int w1_max_slave_ttl = 10; | |
51 | ||
52 | module_param_named(timeout, w1_timeout, int, 0); | |
3aca692d | 53 | module_param_named(control_timeout, w1_control_timeout, int, 0); |
1da177e4 LT |
54 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
55 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); | |
56 | ||
57 | DEFINE_SPINLOCK(w1_mlock); | |
58 | LIST_HEAD(w1_masters); | |
59 | ||
60 | static pid_t control_thread; | |
61 | static int control_needs_exit; | |
62 | static DECLARE_COMPLETION(w1_control_complete); | |
63 | ||
64 | static int w1_master_match(struct device *dev, struct device_driver *drv) | |
65 | { | |
66 | return 1; | |
67 | } | |
68 | ||
69 | static int w1_master_probe(struct device *dev) | |
70 | { | |
71 | return -ENODEV; | |
72 | } | |
73 | ||
1da177e4 LT |
74 | static void w1_master_release(struct device *dev) |
75 | { | |
db2d0008 | 76 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
77 | |
78 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
79 | ||
80 | if (md->nls && md->nls->sk_socket) | |
81 | sock_release(md->nls->sk_socket); | |
82 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); | |
83 | kfree(md); | |
1da177e4 LT |
84 | } |
85 | ||
86 | static void w1_slave_release(struct device *dev) | |
87 | { | |
db2d0008 | 88 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d EP |
89 | |
90 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); | |
91 | ||
92 | while (atomic_read(&sl->refcnt)) { | |
93 | dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n", | |
94 | sl->name, atomic_read(&sl->refcnt)); | |
95 | if (msleep_interruptible(1000)) | |
96 | flush_signals(current); | |
97 | } | |
98 | ||
99 | w1_family_put(sl->family); | |
100 | sl->master->slave_count--; | |
101 | ||
102 | complete(&sl->released); | |
1da177e4 LT |
103 | } |
104 | ||
d2a4ef6a | 105 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 106 | { |
3aca692d | 107 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 108 | |
3aca692d | 109 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
110 | } |
111 | ||
d2a4ef6a | 112 | static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) |
1da177e4 | 113 | { |
3aca692d | 114 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
1da177e4 | 115 | |
3aca692d EP |
116 | atomic_inc(&sl->refcnt); |
117 | if (off > 8) { | |
118 | count = 0; | |
d2a4ef6a EP |
119 | } else { |
120 | if (off + count > 8) | |
121 | count = 8 - off; | |
122 | ||
123 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
124 | } | |
125 | atomic_dec(&sl->refcnt); | |
126 | ||
127 | return count; | |
3aca692d | 128 | } |
d2a4ef6a EP |
129 | |
130 | static struct device_attribute w1_slave_attr_name = | |
131 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); | |
132 | ||
133 | static struct bin_attribute w1_slave_attr_bin_id = { | |
134 | .attr = { | |
135 | .name = "id", | |
136 | .mode = S_IRUGO, | |
137 | .owner = THIS_MODULE, | |
138 | }, | |
139 | .size = 8, | |
140 | .read = w1_slave_read_id, | |
7785925d EP |
141 | }; |
142 | ||
d2a4ef6a EP |
143 | /* Default family */ |
144 | static struct w1_family w1_default_family; | |
145 | ||
7f772ed8 | 146 | static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 147 | |
1da177e4 LT |
148 | static struct bus_type w1_bus_type = { |
149 | .name = "w1", | |
150 | .match = w1_master_match, | |
7f772ed8 | 151 | .hotplug = w1_hotplug, |
1da177e4 LT |
152 | }; |
153 | ||
7f772ed8 EP |
154 | struct device_driver w1_master_driver = { |
155 | .name = "w1_master_driver", | |
1da177e4 LT |
156 | .bus = &w1_bus_type, |
157 | .probe = w1_master_probe, | |
1da177e4 LT |
158 | }; |
159 | ||
7f772ed8 | 160 | struct device w1_master_device = { |
1da177e4 LT |
161 | .parent = NULL, |
162 | .bus = &w1_bus_type, | |
163 | .bus_id = "w1 bus master", | |
7f772ed8 | 164 | .driver = &w1_master_driver, |
1da177e4 LT |
165 | .release = &w1_master_release |
166 | }; | |
167 | ||
7f772ed8 EP |
168 | struct device_driver w1_slave_driver = { |
169 | .name = "w1_slave_driver", | |
170 | .bus = &w1_bus_type, | |
171 | }; | |
172 | ||
173 | struct device w1_slave_device = { | |
174 | .parent = NULL, | |
175 | .bus = &w1_bus_type, | |
176 | .bus_id = "w1 bus slave", | |
177 | .driver = &w1_slave_driver, | |
3aca692d | 178 | .release = &w1_slave_release |
7f772ed8 EP |
179 | }; |
180 | ||
060b8845 | 181 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 182 | { |
db2d0008 | 183 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 184 | ssize_t count; |
7785925d | 185 | |
1da177e4 LT |
186 | if (down_interruptible (&md->mutex)) |
187 | return -EBUSY; | |
188 | ||
189 | count = sprintf(buf, "%s\n", md->name); | |
7785925d | 190 | |
1da177e4 LT |
191 | up(&md->mutex); |
192 | ||
193 | return count; | |
194 | } | |
195 | ||
2a9d0c17 EP |
196 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
197 | struct device_attribute *attr, | |
198 | const char * buf, size_t count) | |
199 | { | |
db2d0008 | 200 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
201 | |
202 | if (down_interruptible (&md->mutex)) | |
203 | return -EBUSY; | |
204 | ||
205 | md->search_count = simple_strtol(buf, NULL, 0); | |
206 | ||
207 | up(&md->mutex); | |
208 | ||
209 | return count; | |
210 | } | |
211 | ||
212 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
213 | struct device_attribute *attr, | |
214 | char *buf) | |
215 | { | |
db2d0008 | 216 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
217 | ssize_t count; |
218 | ||
219 | if (down_interruptible (&md->mutex)) | |
220 | return -EBUSY; | |
221 | ||
222 | count = sprintf(buf, "%d\n", md->search_count); | |
223 | ||
224 | up(&md->mutex); | |
225 | ||
226 | return count; | |
227 | } | |
228 | ||
060b8845 | 229 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 230 | { |
db2d0008 | 231 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 232 | ssize_t count; |
7785925d | 233 | |
1da177e4 LT |
234 | if (down_interruptible(&md->mutex)) |
235 | return -EBUSY; | |
236 | ||
237 | count = sprintf(buf, "0x%p\n", md->bus_master); | |
7785925d | 238 | |
1da177e4 LT |
239 | up(&md->mutex); |
240 | return count; | |
241 | } | |
242 | ||
060b8845 | 243 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
244 | { |
245 | ssize_t count; | |
246 | count = sprintf(buf, "%d\n", w1_timeout); | |
247 | return count; | |
248 | } | |
249 | ||
060b8845 | 250 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 251 | { |
db2d0008 | 252 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 253 | ssize_t count; |
7785925d | 254 | |
1da177e4 LT |
255 | if (down_interruptible(&md->mutex)) |
256 | return -EBUSY; | |
257 | ||
258 | count = sprintf(buf, "%d\n", md->max_slave_count); | |
7785925d | 259 | |
1da177e4 LT |
260 | up(&md->mutex); |
261 | return count; | |
262 | } | |
263 | ||
060b8845 | 264 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 265 | { |
db2d0008 | 266 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 267 | ssize_t count; |
7785925d | 268 | |
1da177e4 LT |
269 | if (down_interruptible(&md->mutex)) |
270 | return -EBUSY; | |
271 | ||
272 | count = sprintf(buf, "%lu\n", md->attempts); | |
7785925d | 273 | |
1da177e4 LT |
274 | up(&md->mutex); |
275 | return count; | |
276 | } | |
277 | ||
060b8845 | 278 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 279 | { |
db2d0008 | 280 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 281 | ssize_t count; |
7785925d | 282 | |
1da177e4 LT |
283 | if (down_interruptible(&md->mutex)) |
284 | return -EBUSY; | |
285 | ||
286 | count = sprintf(buf, "%d\n", md->slave_count); | |
7785925d | 287 | |
1da177e4 LT |
288 | up(&md->mutex); |
289 | return count; | |
290 | } | |
291 | ||
060b8845 | 292 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 293 | { |
db2d0008 | 294 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
295 | int c = PAGE_SIZE; |
296 | ||
297 | if (down_interruptible(&md->mutex)) | |
298 | return -EBUSY; | |
299 | ||
300 | if (md->slave_count == 0) | |
301 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
302 | else { | |
303 | struct list_head *ent, *n; | |
304 | struct w1_slave *sl; | |
305 | ||
306 | list_for_each_safe(ent, n, &md->slist) { | |
307 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
308 | ||
7785925d | 309 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
310 | } |
311 | } | |
312 | ||
313 | up(&md->mutex); | |
314 | ||
315 | return PAGE_SIZE - c; | |
316 | } | |
317 | ||
7785925d EP |
318 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
319 | struct device_attribute w1_master_attribute_##_name = \ | |
320 | __ATTR(w1_master_##_name, _mode, \ | |
321 | w1_master_attribute_show_##_name, NULL) | |
322 | ||
2a9d0c17 EP |
323 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
324 | struct device_attribute w1_master_attribute_##_name = \ | |
325 | __ATTR(w1_master_##_name, _mode, \ | |
326 | w1_master_attribute_show_##_name, \ | |
327 | w1_master_attribute_store_##_name) | |
328 | ||
7785925d EP |
329 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
330 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
331 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
332 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
333 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
334 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
335 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 336 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
337 | |
338 | static struct attribute *w1_master_default_attrs[] = { | |
339 | &w1_master_attribute_name.attr, | |
340 | &w1_master_attribute_slaves.attr, | |
341 | &w1_master_attribute_slave_count.attr, | |
342 | &w1_master_attribute_max_slave_count.attr, | |
343 | &w1_master_attribute_attempts.attr, | |
344 | &w1_master_attribute_timeout.attr, | |
345 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 346 | &w1_master_attribute_search.attr, |
7785925d | 347 | NULL |
1da177e4 LT |
348 | }; |
349 | ||
7785925d EP |
350 | static struct attribute_group w1_master_defattr_group = { |
351 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
352 | }; |
353 | ||
7785925d EP |
354 | int w1_create_master_attributes(struct w1_master *master) |
355 | { | |
356 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
357 | } | |
358 | ||
359 | void w1_destroy_master_attributes(struct w1_master *master) | |
360 | { | |
361 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
362 | } | |
363 | ||
7f772ed8 EP |
364 | #ifdef CONFIG_HOTPLUG |
365 | static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) | |
366 | { | |
367 | struct w1_master *md = NULL; | |
368 | struct w1_slave *sl = NULL; | |
369 | char *event_owner, *name; | |
370 | int err, cur_index=0, cur_len=0; | |
371 | ||
372 | if (dev->driver == &w1_master_driver) { | |
373 | md = container_of(dev, struct w1_master, dev); | |
374 | event_owner = "master"; | |
375 | name = md->name; | |
376 | } else if (dev->driver == &w1_slave_driver) { | |
377 | sl = container_of(dev, struct w1_slave, dev); | |
378 | event_owner = "slave"; | |
379 | name = sl->name; | |
380 | } else { | |
381 | dev_dbg(dev, "Unknown hotplug event.\n"); | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
385 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id); | |
386 | ||
387 | if (dev->driver != &w1_slave_driver || !sl) | |
388 | return 0; | |
389 | ||
390 | err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
391 | if (err) | |
392 | return err; | |
393 | ||
5e8eb850 | 394 | err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id); |
7f772ed8 EP |
395 | if (err) |
396 | return err; | |
397 | ||
398 | return 0; | |
399 | }; | |
400 | #else | |
401 | static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) | |
402 | { | |
403 | return 0; | |
404 | } | |
405 | #endif | |
406 | ||
1da177e4 LT |
407 | static int __w1_attach_slave_device(struct w1_slave *sl) |
408 | { | |
409 | int err; | |
410 | ||
411 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 412 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
413 | sl->dev.bus = &w1_bus_type; |
414 | sl->dev.release = &w1_slave_release; | |
415 | ||
416 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
417 | "%02x-%012llx", |
418 | (unsigned int) sl->reg_num.family, | |
419 | (unsigned long long) sl->reg_num.id); | |
420 | snprintf(&sl->name[0], sizeof(sl->name), | |
421 | "%02x-%012llx", | |
422 | (unsigned int) sl->reg_num.family, | |
423 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 424 | |
3aca692d | 425 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); |
1da177e4 LT |
426 | |
427 | err = device_register(&sl->dev); | |
428 | if (err < 0) { | |
429 | dev_err(&sl->dev, | |
6b729861 EP |
430 | "Device registration [%s] failed. err=%d\n", |
431 | sl->dev.bus_id, err); | |
1da177e4 LT |
432 | return err; |
433 | } | |
434 | ||
d2a4ef6a EP |
435 | /* Create "name" entry */ |
436 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
437 | if (err < 0) { | |
438 | dev_err(&sl->dev, | |
439 | "sysfs file creation for [%s] failed. err=%d\n", | |
440 | sl->dev.bus_id, err); | |
441 | goto out_unreg; | |
442 | } | |
1da177e4 | 443 | |
d2a4ef6a EP |
444 | /* Create "id" entry */ |
445 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
446 | if (err < 0) { |
447 | dev_err(&sl->dev, | |
6b729861 EP |
448 | "sysfs file creation for [%s] failed. err=%d\n", |
449 | sl->dev.bus_id, err); | |
d2a4ef6a | 450 | goto out_rem1; |
1da177e4 LT |
451 | } |
452 | ||
d2a4ef6a EP |
453 | /* if the family driver needs to initialize something... */ |
454 | if (sl->family->fops && sl->family->fops->add_slave && | |
455 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
456 | dev_err(&sl->dev, | |
457 | "sysfs file creation for [%s] failed. err=%d\n", | |
458 | sl->dev.bus_id, err); | |
459 | goto out_rem2; | |
1da177e4 LT |
460 | } |
461 | ||
462 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
463 | ||
464 | return 0; | |
d2a4ef6a EP |
465 | |
466 | out_rem2: | |
467 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
468 | out_rem1: | |
469 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
470 | out_unreg: | |
471 | device_unregister(&sl->dev); | |
472 | return err; | |
1da177e4 LT |
473 | } |
474 | ||
475 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
476 | { | |
477 | struct w1_slave *sl; | |
478 | struct w1_family *f; | |
479 | int err; | |
480 | struct w1_netlink_msg msg; | |
481 | ||
482 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
483 | if (!sl) { | |
484 | dev_err(&dev->dev, | |
485 | "%s: failed to allocate new slave device.\n", | |
486 | __func__); | |
487 | return -ENOMEM; | |
488 | } | |
489 | ||
490 | memset(sl, 0, sizeof(*sl)); | |
491 | ||
492 | sl->owner = THIS_MODULE; | |
493 | sl->master = dev; | |
494 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
495 | ||
496 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); | |
497 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 498 | init_completion(&sl->released); |
1da177e4 LT |
499 | |
500 | spin_lock(&w1_flock); | |
501 | f = w1_family_registered(rn->family); | |
502 | if (!f) { | |
99c5bfe9 | 503 | f= &w1_default_family; |
1da177e4 LT |
504 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
505 | rn->family, rn->family, | |
506 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
507 | } |
508 | __w1_family_get(f); | |
509 | spin_unlock(&w1_flock); | |
510 | ||
511 | sl->family = f; | |
512 | ||
513 | ||
514 | err = __w1_attach_slave_device(sl); | |
515 | if (err < 0) { | |
516 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
517 | sl->name); | |
518 | w1_family_put(sl->family); | |
519 | kfree(sl); | |
520 | return err; | |
521 | } | |
522 | ||
523 | sl->ttl = dev->slave_ttl; | |
524 | dev->slave_count++; | |
525 | ||
526 | memcpy(&msg.id.id, rn, sizeof(msg.id.id)); | |
527 | msg.type = W1_SLAVE_ADD; | |
528 | w1_netlink_send(dev, &msg); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static void w1_slave_detach(struct w1_slave *sl) | |
534 | { | |
535 | struct w1_netlink_msg msg; | |
7785925d | 536 | |
7c8f5703 | 537 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 538 | |
3aca692d | 539 | list_del(&sl->w1_slave_entry); |
1da177e4 | 540 | |
d2a4ef6a EP |
541 | if (sl->family->fops && sl->family->fops->remove_slave) |
542 | sl->family->fops->remove_slave(sl); | |
543 | ||
3aca692d EP |
544 | memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); |
545 | msg.type = W1_SLAVE_REMOVE; | |
546 | w1_netlink_send(sl->master, &msg); | |
547 | ||
d2a4ef6a EP |
548 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
549 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 550 | device_unregister(&sl->dev); |
1da177e4 | 551 | |
3aca692d EP |
552 | wait_for_completion(&sl->released); |
553 | kfree(sl); | |
1da177e4 LT |
554 | } |
555 | ||
556 | static struct w1_master *w1_search_master(unsigned long data) | |
557 | { | |
558 | struct w1_master *dev; | |
559 | int found = 0; | |
7785925d EP |
560 | |
561 | spin_lock_bh(&w1_mlock); | |
1da177e4 LT |
562 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
563 | if (dev->bus_master->data == data) { | |
564 | found = 1; | |
565 | atomic_inc(&dev->refcnt); | |
566 | break; | |
567 | } | |
568 | } | |
7785925d | 569 | spin_unlock_bh(&w1_mlock); |
1da177e4 LT |
570 | |
571 | return (found)?dev:NULL; | |
572 | } | |
573 | ||
6adf87bd EP |
574 | void w1_reconnect_slaves(struct w1_family *f) |
575 | { | |
576 | struct w1_master *dev; | |
577 | ||
578 | spin_lock_bh(&w1_mlock); | |
579 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
7c8f5703 | 580 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
581 | dev->name, f->fid); |
582 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
583 | } | |
584 | spin_unlock_bh(&w1_mlock); | |
585 | } | |
586 | ||
7785925d | 587 | static void w1_slave_found(unsigned long data, u64 rn) |
1da177e4 LT |
588 | { |
589 | int slave_count; | |
590 | struct w1_slave *sl; | |
591 | struct list_head *ent; | |
592 | struct w1_reg_num *tmp; | |
593 | int family_found = 0; | |
594 | struct w1_master *dev; | |
0e65f828 | 595 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
596 | |
597 | dev = w1_search_master(data); | |
598 | if (!dev) { | |
599 | printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n", | |
600 | data); | |
601 | return; | |
602 | } | |
7785925d | 603 | |
1da177e4 LT |
604 | tmp = (struct w1_reg_num *) &rn; |
605 | ||
606 | slave_count = 0; | |
607 | list_for_each(ent, &dev->slist) { | |
608 | ||
609 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
610 | ||
611 | if (sl->reg_num.family == tmp->family && | |
612 | sl->reg_num.id == tmp->id && | |
613 | sl->reg_num.crc == tmp->crc) { | |
614 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
615 | break; | |
7785925d | 616 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
617 | family_found = 1; |
618 | break; | |
619 | } | |
620 | ||
621 | slave_count++; | |
622 | } | |
623 | ||
8523ff45 | 624 | if (slave_count == dev->slave_count && |
0e65f828 | 625 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 626 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 627 | } |
7785925d | 628 | |
1da177e4 LT |
629 | atomic_dec(&dev->refcnt); |
630 | } | |
631 | ||
6b729861 EP |
632 | /** |
633 | * Performs a ROM Search & registers any devices found. | |
634 | * The 1-wire search is a simple binary tree search. | |
635 | * For each bit of the address, we read two bits and write one bit. | |
636 | * The bit written will put to sleep all devies that don't match that bit. | |
637 | * When the two reads differ, the direction choice is obvious. | |
638 | * When both bits are 0, we must choose a path to take. | |
639 | * When we can scan all 64 bits without having to choose a path, we are done. | |
640 | * | |
641 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
642 | * | |
643 | * @dev The master device to search | |
644 | * @cb Function to call when a device is found | |
645 | */ | |
646 | void w1_search(struct w1_master *dev, w1_slave_found_callback cb) | |
1da177e4 | 647 | { |
6b729861 EP |
648 | u64 last_rn, rn, tmp64; |
649 | int i, slave_count = 0; | |
650 | int last_zero, last_device; | |
651 | int search_bit, desc_bit; | |
652 | u8 triplet_ret = 0; | |
1da177e4 | 653 | |
6b729861 EP |
654 | search_bit = 0; |
655 | rn = last_rn = 0; | |
656 | last_device = 0; | |
657 | last_zero = -1; | |
1da177e4 LT |
658 | |
659 | desc_bit = 64; | |
660 | ||
6b729861 EP |
661 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
662 | last_rn = rn; | |
1da177e4 LT |
663 | rn = 0; |
664 | ||
1da177e4 LT |
665 | /* |
666 | * Reset bus and all 1-wire device state machines | |
667 | * so they can respond to our requests. | |
668 | * | |
669 | * Return 0 - device(s) present, 1 - no devices present. | |
670 | */ | |
671 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 672 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
673 | break; |
674 | } | |
675 | ||
6b729861 | 676 | /* Start the search */ |
1da177e4 LT |
677 | w1_write_8(dev, W1_SEARCH); |
678 | for (i = 0; i < 64; ++i) { | |
6b729861 EP |
679 | /* Determine the direction/search bit */ |
680 | if (i == desc_bit) | |
681 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
682 | else if (i > desc_bit) | |
683 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 684 | else |
6b729861 | 685 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 686 | |
6b729861 EP |
687 | /** Read two bits and write one bit */ |
688 | triplet_ret = w1_triplet(dev, search_bit); | |
689 | ||
690 | /* quit if no device responded */ | |
691 | if ( (triplet_ret & 0x03) == 0x03 ) | |
692 | break; | |
1da177e4 | 693 | |
6b729861 EP |
694 | /* If both directions were valid, and we took the 0 path... */ |
695 | if (triplet_ret == 0) | |
696 | last_zero = i; | |
1da177e4 | 697 | |
6b729861 EP |
698 | /* extract the direction taken & update the device number */ |
699 | tmp64 = (triplet_ret >> 2); | |
700 | rn |= (tmp64 << i); | |
701 | } | |
7785925d | 702 | |
6b729861 EP |
703 | if ( (triplet_ret & 0x03) != 0x03 ) { |
704 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
705 | last_device = 1; | |
706 | desc_bit = last_zero; | |
707 | cb(dev->bus_master->data, rn); | |
708 | } | |
1da177e4 LT |
709 | } |
710 | } | |
711 | ||
7785925d | 712 | static int w1_control(void *data) |
1da177e4 | 713 | { |
7785925d EP |
714 | struct w1_slave *sl, *sln; |
715 | struct w1_master *dev, *n; | |
1da177e4 LT |
716 | int err, have_to_wait = 0; |
717 | ||
718 | daemonize("w1_control"); | |
719 | allow_signal(SIGTERM); | |
720 | ||
721 | while (!control_needs_exit || have_to_wait) { | |
722 | have_to_wait = 0; | |
723 | ||
3e1d1d28 | 724 | try_to_freeze(); |
3aca692d | 725 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 LT |
726 | |
727 | if (signal_pending(current)) | |
728 | flush_signals(current); | |
729 | ||
7785925d | 730 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
6adf87bd | 731 | if (!control_needs_exit && !dev->flags) |
1da177e4 LT |
732 | continue; |
733 | /* | |
734 | * Little race: we can create thread but not set the flag. | |
735 | * Get a chance for external process to set flag up. | |
736 | */ | |
737 | if (!dev->initialized) { | |
738 | have_to_wait = 1; | |
739 | continue; | |
740 | } | |
741 | ||
1da177e4 | 742 | if (control_needs_exit) { |
6adf87bd | 743 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 LT |
744 | |
745 | err = kill_proc(dev->kpid, SIGTERM, 1); | |
746 | if (err) | |
747 | dev_err(&dev->dev, | |
748 | "Failed to send signal to w1 kernel thread %d.\n", | |
749 | dev->kpid); | |
750 | } | |
751 | ||
6adf87bd EP |
752 | if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
753 | wait_for_completion(&dev->dev_exited); | |
754 | spin_lock_bh(&w1_mlock); | |
755 | list_del(&dev->w1_master_entry); | |
756 | spin_unlock_bh(&w1_mlock); | |
757 | ||
3aca692d | 758 | down(&dev->mutex); |
6adf87bd | 759 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 760 | w1_slave_detach(sl); |
6adf87bd EP |
761 | } |
762 | w1_destroy_master_attributes(dev); | |
3aca692d | 763 | up(&dev->mutex); |
6adf87bd EP |
764 | atomic_dec(&dev->refcnt); |
765 | continue; | |
766 | } | |
767 | ||
768 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 769 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
6adf87bd | 770 | down(&dev->mutex); |
3aca692d | 771 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
772 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
773 | struct w1_reg_num rn; | |
6adf87bd EP |
774 | |
775 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 776 | w1_slave_detach(sl); |
1da177e4 | 777 | |
6adf87bd EP |
778 | w1_attach_slave_device(dev, &rn); |
779 | } | |
780 | } | |
7c8f5703 | 781 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd EP |
782 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
783 | up(&dev->mutex); | |
1da177e4 | 784 | } |
1da177e4 LT |
785 | } |
786 | } | |
787 | ||
788 | complete_and_exit(&w1_control_complete, 0); | |
789 | } | |
790 | ||
791 | int w1_process(void *data) | |
792 | { | |
793 | struct w1_master *dev = (struct w1_master *) data; | |
7785925d | 794 | struct w1_slave *sl, *sln; |
1da177e4 LT |
795 | |
796 | daemonize("%s", dev->name); | |
797 | allow_signal(SIGTERM); | |
798 | ||
6adf87bd | 799 | while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 800 | try_to_freeze(); |
1da177e4 LT |
801 | msleep_interruptible(w1_timeout * 1000); |
802 | ||
803 | if (signal_pending(current)) | |
804 | flush_signals(current); | |
805 | ||
6adf87bd | 806 | if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
807 | break; |
808 | ||
809 | if (!dev->initialized) | |
810 | continue; | |
811 | ||
2a9d0c17 EP |
812 | if (dev->search_count == 0) |
813 | continue; | |
814 | ||
1da177e4 LT |
815 | if (down_interruptible(&dev->mutex)) |
816 | continue; | |
817 | ||
7785925d | 818 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
2a9d0c17 | 819 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
1da177e4 | 820 | |
7785925d | 821 | w1_search_devices(dev, w1_slave_found); |
1da177e4 | 822 | |
7785925d EP |
823 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
824 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
d2a4ef6a | 825 | w1_slave_detach(sl); |
1da177e4 LT |
826 | |
827 | dev->slave_count--; | |
7785925d | 828 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
1da177e4 LT |
829 | sl->ttl = dev->slave_ttl; |
830 | } | |
2a9d0c17 EP |
831 | |
832 | if (dev->search_count > 0) | |
833 | dev->search_count--; | |
834 | ||
1da177e4 LT |
835 | up(&dev->mutex); |
836 | } | |
837 | ||
838 | atomic_dec(&dev->refcnt); | |
839 | complete_and_exit(&dev->dev_exited, 0); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
7785925d | 844 | static int w1_init(void) |
1da177e4 LT |
845 | { |
846 | int retval; | |
847 | ||
848 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
849 | ||
850 | retval = bus_register(&w1_bus_type); | |
851 | if (retval) { | |
852 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
853 | goto err_out_exit_init; | |
854 | } | |
855 | ||
7f772ed8 | 856 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
857 | if (retval) { |
858 | printk(KERN_ERR | |
859 | "Failed to register master driver. err=%d.\n", | |
860 | retval); | |
861 | goto err_out_bus_unregister; | |
862 | } | |
863 | ||
7f772ed8 EP |
864 | retval = driver_register(&w1_slave_driver); |
865 | if (retval) { | |
866 | printk(KERN_ERR | |
867 | "Failed to register master driver. err=%d.\n", | |
868 | retval); | |
869 | goto err_out_master_unregister; | |
870 | } | |
871 | ||
1da177e4 LT |
872 | control_thread = kernel_thread(&w1_control, NULL, 0); |
873 | if (control_thread < 0) { | |
874 | printk(KERN_ERR "Failed to create control thread. err=%d\n", | |
875 | control_thread); | |
876 | retval = control_thread; | |
7f772ed8 | 877 | goto err_out_slave_unregister; |
1da177e4 LT |
878 | } |
879 | ||
880 | return 0; | |
881 | ||
7f772ed8 EP |
882 | err_out_slave_unregister: |
883 | driver_unregister(&w1_slave_driver); | |
884 | ||
885 | err_out_master_unregister: | |
886 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
887 | |
888 | err_out_bus_unregister: | |
889 | bus_unregister(&w1_bus_type); | |
890 | ||
891 | err_out_exit_init: | |
892 | return retval; | |
893 | } | |
894 | ||
7785925d | 895 | static void w1_fini(void) |
1da177e4 LT |
896 | { |
897 | struct w1_master *dev; | |
1da177e4 | 898 | |
7785925d | 899 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 900 | __w1_remove_master_device(dev); |
1da177e4 LT |
901 | |
902 | control_needs_exit = 1; | |
1da177e4 LT |
903 | wait_for_completion(&w1_control_complete); |
904 | ||
7f772ed8 EP |
905 | driver_unregister(&w1_slave_driver); |
906 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
907 | bus_unregister(&w1_bus_type); |
908 | } | |
909 | ||
910 | module_init(w1_init); | |
911 | module_exit(w1_fini); |