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> | |
674a396c | 33 | #include <linux/kthread.h> |
1da177e4 LT |
34 | |
35 | #include <asm/atomic.h> | |
36 | ||
37 | #include "w1.h" | |
38 | #include "w1_io.h" | |
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"); | |
45 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); | |
46 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); | |
47 | ||
48 | static int w1_timeout = 10; | |
3aca692d | 49 | static int w1_control_timeout = 1; |
1da177e4 LT |
50 | int w1_max_slave_count = 10; |
51 | int w1_max_slave_ttl = 10; | |
52 | ||
53 | module_param_named(timeout, w1_timeout, int, 0); | |
3aca692d | 54 | module_param_named(control_timeout, w1_control_timeout, int, 0); |
1da177e4 LT |
55 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
56 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); | |
57 | ||
58 | DEFINE_SPINLOCK(w1_mlock); | |
59 | LIST_HEAD(w1_masters); | |
60 | ||
674a396c | 61 | static struct task_struct *w1_control_thread; |
1da177e4 LT |
62 | |
63 | static int w1_master_match(struct device *dev, struct device_driver *drv) | |
64 | { | |
65 | return 1; | |
66 | } | |
67 | ||
68 | static int w1_master_probe(struct device *dev) | |
69 | { | |
70 | return -ENODEV; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | static void w1_master_release(struct device *dev) |
74 | { | |
db2d0008 | 75 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
76 | |
77 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
78 | ||
2d1f87a7 | 79 | dev_fini_netlink(md); |
3aca692d EP |
80 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
81 | kfree(md); | |
1da177e4 LT |
82 | } |
83 | ||
84 | static void w1_slave_release(struct device *dev) | |
85 | { | |
db2d0008 | 86 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d EP |
87 | |
88 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); | |
89 | ||
90 | while (atomic_read(&sl->refcnt)) { | |
91 | dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n", | |
92 | sl->name, atomic_read(&sl->refcnt)); | |
93 | if (msleep_interruptible(1000)) | |
94 | flush_signals(current); | |
95 | } | |
96 | ||
97 | w1_family_put(sl->family); | |
98 | sl->master->slave_count--; | |
99 | ||
100 | complete(&sl->released); | |
1da177e4 LT |
101 | } |
102 | ||
d2a4ef6a | 103 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 104 | { |
3aca692d | 105 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 106 | |
3aca692d | 107 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
108 | } |
109 | ||
d2a4ef6a | 110 | static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) |
1da177e4 | 111 | { |
3aca692d | 112 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
1da177e4 | 113 | |
3aca692d EP |
114 | atomic_inc(&sl->refcnt); |
115 | if (off > 8) { | |
116 | count = 0; | |
d2a4ef6a EP |
117 | } else { |
118 | if (off + count > 8) | |
119 | count = 8 - off; | |
120 | ||
121 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
122 | } | |
123 | atomic_dec(&sl->refcnt); | |
124 | ||
125 | return count; | |
3aca692d | 126 | } |
d2a4ef6a EP |
127 | |
128 | static struct device_attribute w1_slave_attr_name = | |
129 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); | |
130 | ||
131 | static struct bin_attribute w1_slave_attr_bin_id = { | |
132 | .attr = { | |
133 | .name = "id", | |
134 | .mode = S_IRUGO, | |
135 | .owner = THIS_MODULE, | |
136 | }, | |
137 | .size = 8, | |
138 | .read = w1_slave_read_id, | |
7785925d EP |
139 | }; |
140 | ||
d2a4ef6a EP |
141 | /* Default family */ |
142 | static struct w1_family w1_default_family; | |
143 | ||
312c004d | 144 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 145 | |
1da177e4 LT |
146 | static struct bus_type w1_bus_type = { |
147 | .name = "w1", | |
148 | .match = w1_master_match, | |
312c004d | 149 | .uevent = w1_uevent, |
1da177e4 LT |
150 | }; |
151 | ||
7f772ed8 EP |
152 | struct device_driver w1_master_driver = { |
153 | .name = "w1_master_driver", | |
1da177e4 LT |
154 | .bus = &w1_bus_type, |
155 | .probe = w1_master_probe, | |
1da177e4 LT |
156 | }; |
157 | ||
7f772ed8 | 158 | struct device w1_master_device = { |
1da177e4 LT |
159 | .parent = NULL, |
160 | .bus = &w1_bus_type, | |
161 | .bus_id = "w1 bus master", | |
7f772ed8 | 162 | .driver = &w1_master_driver, |
1da177e4 LT |
163 | .release = &w1_master_release |
164 | }; | |
165 | ||
a9fb1c7b | 166 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
167 | .name = "w1_slave_driver", |
168 | .bus = &w1_bus_type, | |
169 | }; | |
170 | ||
a9fb1c7b | 171 | #if 0 |
7f772ed8 EP |
172 | struct device w1_slave_device = { |
173 | .parent = NULL, | |
174 | .bus = &w1_bus_type, | |
175 | .bus_id = "w1 bus slave", | |
176 | .driver = &w1_slave_driver, | |
3aca692d | 177 | .release = &w1_slave_release |
7f772ed8 | 178 | }; |
a9fb1c7b | 179 | #endif /* 0 */ |
7f772ed8 | 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 | ||
a9fb1c7b | 359 | static void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
360 | { |
361 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
362 | } | |
363 | ||
7f772ed8 | 364 | #ifdef CONFIG_HOTPLUG |
312c004d | 365 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
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 { | |
312c004d | 381 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
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 | ||
f73b5e79 AM |
390 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
391 | &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
7f772ed8 EP |
392 | if (err) |
393 | return err; | |
394 | ||
f73b5e79 AM |
395 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
396 | &cur_len, "W1_SLAVE_ID=%024LX", | |
397 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
398 | if (err) |
399 | return err; | |
400 | ||
401 | return 0; | |
402 | }; | |
403 | #else | |
312c004d | 404 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
405 | { |
406 | return 0; | |
407 | } | |
408 | #endif | |
409 | ||
1da177e4 LT |
410 | static int __w1_attach_slave_device(struct w1_slave *sl) |
411 | { | |
412 | int err; | |
413 | ||
414 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 415 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
416 | sl->dev.bus = &w1_bus_type; |
417 | sl->dev.release = &w1_slave_release; | |
418 | ||
419 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
420 | "%02x-%012llx", |
421 | (unsigned int) sl->reg_num.family, | |
422 | (unsigned long long) sl->reg_num.id); | |
423 | snprintf(&sl->name[0], sizeof(sl->name), | |
424 | "%02x-%012llx", | |
425 | (unsigned int) sl->reg_num.family, | |
426 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 427 | |
3aca692d | 428 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); |
1da177e4 LT |
429 | |
430 | err = device_register(&sl->dev); | |
431 | if (err < 0) { | |
432 | dev_err(&sl->dev, | |
6b729861 EP |
433 | "Device registration [%s] failed. err=%d\n", |
434 | sl->dev.bus_id, err); | |
1da177e4 LT |
435 | return err; |
436 | } | |
437 | ||
d2a4ef6a EP |
438 | /* Create "name" entry */ |
439 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
440 | if (err < 0) { | |
441 | dev_err(&sl->dev, | |
442 | "sysfs file creation for [%s] failed. err=%d\n", | |
443 | sl->dev.bus_id, err); | |
444 | goto out_unreg; | |
445 | } | |
1da177e4 | 446 | |
d2a4ef6a EP |
447 | /* Create "id" entry */ |
448 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
449 | if (err < 0) { |
450 | dev_err(&sl->dev, | |
6b729861 EP |
451 | "sysfs file creation for [%s] failed. err=%d\n", |
452 | sl->dev.bus_id, err); | |
d2a4ef6a | 453 | goto out_rem1; |
1da177e4 LT |
454 | } |
455 | ||
d2a4ef6a EP |
456 | /* if the family driver needs to initialize something... */ |
457 | if (sl->family->fops && sl->family->fops->add_slave && | |
458 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
459 | dev_err(&sl->dev, | |
460 | "sysfs file creation for [%s] failed. err=%d\n", | |
461 | sl->dev.bus_id, err); | |
462 | goto out_rem2; | |
1da177e4 LT |
463 | } |
464 | ||
465 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
466 | ||
467 | return 0; | |
d2a4ef6a EP |
468 | |
469 | out_rem2: | |
470 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
471 | out_rem1: | |
472 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
473 | out_unreg: | |
474 | device_unregister(&sl->dev); | |
475 | return err; | |
1da177e4 LT |
476 | } |
477 | ||
478 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
479 | { | |
480 | struct w1_slave *sl; | |
481 | struct w1_family *f; | |
482 | int err; | |
483 | struct w1_netlink_msg msg; | |
484 | ||
485 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
486 | if (!sl) { | |
487 | dev_err(&dev->dev, | |
488 | "%s: failed to allocate new slave device.\n", | |
489 | __func__); | |
490 | return -ENOMEM; | |
491 | } | |
492 | ||
493 | memset(sl, 0, sizeof(*sl)); | |
494 | ||
495 | sl->owner = THIS_MODULE; | |
496 | sl->master = dev; | |
497 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
498 | ||
499 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); | |
500 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 501 | init_completion(&sl->released); |
1da177e4 LT |
502 | |
503 | spin_lock(&w1_flock); | |
504 | f = w1_family_registered(rn->family); | |
505 | if (!f) { | |
99c5bfe9 | 506 | f= &w1_default_family; |
1da177e4 LT |
507 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
508 | rn->family, rn->family, | |
509 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
510 | } |
511 | __w1_family_get(f); | |
512 | spin_unlock(&w1_flock); | |
513 | ||
514 | sl->family = f; | |
515 | ||
516 | ||
517 | err = __w1_attach_slave_device(sl); | |
518 | if (err < 0) { | |
519 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
520 | sl->name); | |
521 | w1_family_put(sl->family); | |
522 | kfree(sl); | |
523 | return err; | |
524 | } | |
525 | ||
526 | sl->ttl = dev->slave_ttl; | |
527 | dev->slave_count++; | |
528 | ||
529 | memcpy(&msg.id.id, rn, sizeof(msg.id.id)); | |
530 | msg.type = W1_SLAVE_ADD; | |
531 | w1_netlink_send(dev, &msg); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static void w1_slave_detach(struct w1_slave *sl) | |
537 | { | |
538 | struct w1_netlink_msg msg; | |
7785925d | 539 | |
7c8f5703 | 540 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 541 | |
3aca692d | 542 | list_del(&sl->w1_slave_entry); |
1da177e4 | 543 | |
d2a4ef6a EP |
544 | if (sl->family->fops && sl->family->fops->remove_slave) |
545 | sl->family->fops->remove_slave(sl); | |
546 | ||
3aca692d EP |
547 | memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); |
548 | msg.type = W1_SLAVE_REMOVE; | |
549 | w1_netlink_send(sl->master, &msg); | |
550 | ||
d2a4ef6a EP |
551 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
552 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 553 | device_unregister(&sl->dev); |
1da177e4 | 554 | |
3aca692d EP |
555 | wait_for_completion(&sl->released); |
556 | kfree(sl); | |
1da177e4 LT |
557 | } |
558 | ||
ccd69940 | 559 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
560 | { |
561 | struct w1_master *dev; | |
562 | int found = 0; | |
7785925d EP |
563 | |
564 | spin_lock_bh(&w1_mlock); | |
1da177e4 LT |
565 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
566 | if (dev->bus_master->data == data) { | |
567 | found = 1; | |
568 | atomic_inc(&dev->refcnt); | |
569 | break; | |
570 | } | |
571 | } | |
7785925d | 572 | spin_unlock_bh(&w1_mlock); |
1da177e4 LT |
573 | |
574 | return (found)?dev:NULL; | |
575 | } | |
576 | ||
6adf87bd EP |
577 | void w1_reconnect_slaves(struct w1_family *f) |
578 | { | |
579 | struct w1_master *dev; | |
580 | ||
581 | spin_lock_bh(&w1_mlock); | |
582 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
7c8f5703 | 583 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
584 | dev->name, f->fid); |
585 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
586 | } | |
587 | spin_unlock_bh(&w1_mlock); | |
588 | } | |
589 | ||
ccd69940 | 590 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
591 | { |
592 | int slave_count; | |
593 | struct w1_slave *sl; | |
594 | struct list_head *ent; | |
595 | struct w1_reg_num *tmp; | |
596 | int family_found = 0; | |
597 | struct w1_master *dev; | |
0e65f828 | 598 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
599 | |
600 | dev = w1_search_master(data); | |
601 | if (!dev) { | |
ccd69940 EP |
602 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
603 | "it is impossible.\n", data); | |
1da177e4 LT |
604 | return; |
605 | } | |
7785925d | 606 | |
1da177e4 LT |
607 | tmp = (struct w1_reg_num *) &rn; |
608 | ||
609 | slave_count = 0; | |
610 | list_for_each(ent, &dev->slist) { | |
611 | ||
612 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
613 | ||
614 | if (sl->reg_num.family == tmp->family && | |
615 | sl->reg_num.id == tmp->id && | |
616 | sl->reg_num.crc == tmp->crc) { | |
617 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
618 | break; | |
7785925d | 619 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
620 | family_found = 1; |
621 | break; | |
622 | } | |
623 | ||
624 | slave_count++; | |
625 | } | |
626 | ||
8523ff45 | 627 | if (slave_count == dev->slave_count && |
0e65f828 | 628 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 629 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 630 | } |
7785925d | 631 | |
1da177e4 LT |
632 | atomic_dec(&dev->refcnt); |
633 | } | |
634 | ||
6b729861 EP |
635 | /** |
636 | * Performs a ROM Search & registers any devices found. | |
637 | * The 1-wire search is a simple binary tree search. | |
638 | * For each bit of the address, we read two bits and write one bit. | |
639 | * The bit written will put to sleep all devies that don't match that bit. | |
640 | * When the two reads differ, the direction choice is obvious. | |
641 | * When both bits are 0, we must choose a path to take. | |
642 | * When we can scan all 64 bits without having to choose a path, we are done. | |
643 | * | |
644 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
645 | * | |
646 | * @dev The master device to search | |
647 | * @cb Function to call when a device is found | |
648 | */ | |
649 | void w1_search(struct w1_master *dev, w1_slave_found_callback cb) | |
1da177e4 | 650 | { |
6b729861 EP |
651 | u64 last_rn, rn, tmp64; |
652 | int i, slave_count = 0; | |
653 | int last_zero, last_device; | |
654 | int search_bit, desc_bit; | |
655 | u8 triplet_ret = 0; | |
1da177e4 | 656 | |
6b729861 EP |
657 | search_bit = 0; |
658 | rn = last_rn = 0; | |
659 | last_device = 0; | |
660 | last_zero = -1; | |
1da177e4 LT |
661 | |
662 | desc_bit = 64; | |
663 | ||
6b729861 EP |
664 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
665 | last_rn = rn; | |
1da177e4 LT |
666 | rn = 0; |
667 | ||
1da177e4 LT |
668 | /* |
669 | * Reset bus and all 1-wire device state machines | |
670 | * so they can respond to our requests. | |
671 | * | |
672 | * Return 0 - device(s) present, 1 - no devices present. | |
673 | */ | |
674 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 675 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
676 | break; |
677 | } | |
678 | ||
6b729861 | 679 | /* Start the search */ |
1da177e4 LT |
680 | w1_write_8(dev, W1_SEARCH); |
681 | for (i = 0; i < 64; ++i) { | |
6b729861 EP |
682 | /* Determine the direction/search bit */ |
683 | if (i == desc_bit) | |
684 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
685 | else if (i > desc_bit) | |
686 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 687 | else |
6b729861 | 688 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 689 | |
6b729861 EP |
690 | /** Read two bits and write one bit */ |
691 | triplet_ret = w1_triplet(dev, search_bit); | |
692 | ||
693 | /* quit if no device responded */ | |
694 | if ( (triplet_ret & 0x03) == 0x03 ) | |
695 | break; | |
1da177e4 | 696 | |
6b729861 EP |
697 | /* If both directions were valid, and we took the 0 path... */ |
698 | if (triplet_ret == 0) | |
699 | last_zero = i; | |
1da177e4 | 700 | |
6b729861 EP |
701 | /* extract the direction taken & update the device number */ |
702 | tmp64 = (triplet_ret >> 2); | |
703 | rn |= (tmp64 << i); | |
704 | } | |
7785925d | 705 | |
6b729861 EP |
706 | if ( (triplet_ret & 0x03) != 0x03 ) { |
707 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
708 | last_device = 1; | |
709 | desc_bit = last_zero; | |
710 | cb(dev->bus_master->data, rn); | |
711 | } | |
1da177e4 LT |
712 | } |
713 | } | |
714 | ||
7785925d | 715 | static int w1_control(void *data) |
1da177e4 | 716 | { |
7785925d EP |
717 | struct w1_slave *sl, *sln; |
718 | struct w1_master *dev, *n; | |
674a396c | 719 | int have_to_wait = 0; |
1da177e4 | 720 | |
674a396c | 721 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
722 | have_to_wait = 0; |
723 | ||
3e1d1d28 | 724 | try_to_freeze(); |
3aca692d | 725 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 726 | |
7785925d | 727 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 728 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
729 | continue; |
730 | /* | |
731 | * Little race: we can create thread but not set the flag. | |
732 | * Get a chance for external process to set flag up. | |
733 | */ | |
734 | if (!dev->initialized) { | |
735 | have_to_wait = 1; | |
736 | continue; | |
737 | } | |
738 | ||
674a396c | 739 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 740 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 741 | |
674a396c | 742 | spin_lock(&w1_mlock); |
6adf87bd | 743 | list_del(&dev->w1_master_entry); |
674a396c | 744 | spin_unlock(&w1_mlock); |
6adf87bd | 745 | |
3aca692d | 746 | down(&dev->mutex); |
6adf87bd | 747 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 748 | w1_slave_detach(sl); |
6adf87bd EP |
749 | } |
750 | w1_destroy_master_attributes(dev); | |
3aca692d | 751 | up(&dev->mutex); |
6adf87bd EP |
752 | atomic_dec(&dev->refcnt); |
753 | continue; | |
754 | } | |
755 | ||
756 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 757 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
6adf87bd | 758 | down(&dev->mutex); |
3aca692d | 759 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
760 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
761 | struct w1_reg_num rn; | |
6adf87bd EP |
762 | |
763 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 764 | w1_slave_detach(sl); |
1da177e4 | 765 | |
6adf87bd EP |
766 | w1_attach_slave_device(dev, &rn); |
767 | } | |
768 | } | |
7c8f5703 | 769 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd EP |
770 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
771 | up(&dev->mutex); | |
1da177e4 | 772 | } |
1da177e4 LT |
773 | } |
774 | } | |
775 | ||
674a396c | 776 | return 0; |
1da177e4 LT |
777 | } |
778 | ||
779 | int w1_process(void *data) | |
780 | { | |
781 | struct w1_master *dev = (struct w1_master *) data; | |
7785925d | 782 | struct w1_slave *sl, *sln; |
1da177e4 | 783 | |
674a396c | 784 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 785 | try_to_freeze(); |
1da177e4 LT |
786 | msleep_interruptible(w1_timeout * 1000); |
787 | ||
674a396c | 788 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
789 | break; |
790 | ||
791 | if (!dev->initialized) | |
792 | continue; | |
793 | ||
2a9d0c17 EP |
794 | if (dev->search_count == 0) |
795 | continue; | |
796 | ||
1da177e4 LT |
797 | if (down_interruptible(&dev->mutex)) |
798 | continue; | |
799 | ||
7785925d | 800 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
2a9d0c17 | 801 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
1da177e4 | 802 | |
7785925d | 803 | w1_search_devices(dev, w1_slave_found); |
1da177e4 | 804 | |
7785925d EP |
805 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
806 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
d2a4ef6a | 807 | w1_slave_detach(sl); |
1da177e4 LT |
808 | |
809 | dev->slave_count--; | |
7785925d | 810 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
1da177e4 LT |
811 | sl->ttl = dev->slave_ttl; |
812 | } | |
2a9d0c17 EP |
813 | |
814 | if (dev->search_count > 0) | |
815 | dev->search_count--; | |
816 | ||
1da177e4 LT |
817 | up(&dev->mutex); |
818 | } | |
819 | ||
820 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
821 | |
822 | return 0; | |
823 | } | |
824 | ||
7785925d | 825 | static int w1_init(void) |
1da177e4 LT |
826 | { |
827 | int retval; | |
828 | ||
829 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
830 | ||
831 | retval = bus_register(&w1_bus_type); | |
832 | if (retval) { | |
833 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
834 | goto err_out_exit_init; | |
835 | } | |
836 | ||
7f772ed8 | 837 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
838 | if (retval) { |
839 | printk(KERN_ERR | |
840 | "Failed to register master driver. err=%d.\n", | |
841 | retval); | |
842 | goto err_out_bus_unregister; | |
843 | } | |
844 | ||
7f772ed8 EP |
845 | retval = driver_register(&w1_slave_driver); |
846 | if (retval) { | |
847 | printk(KERN_ERR | |
848 | "Failed to register master driver. err=%d.\n", | |
849 | retval); | |
850 | goto err_out_master_unregister; | |
851 | } | |
852 | ||
674a396c EP |
853 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
854 | if (IS_ERR(w1_control_thread)) { | |
855 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 856 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 857 | retval); |
7f772ed8 | 858 | goto err_out_slave_unregister; |
1da177e4 LT |
859 | } |
860 | ||
861 | return 0; | |
862 | ||
7f772ed8 EP |
863 | err_out_slave_unregister: |
864 | driver_unregister(&w1_slave_driver); | |
865 | ||
866 | err_out_master_unregister: | |
867 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
868 | |
869 | err_out_bus_unregister: | |
870 | bus_unregister(&w1_bus_type); | |
871 | ||
872 | err_out_exit_init: | |
873 | return retval; | |
874 | } | |
875 | ||
7785925d | 876 | static void w1_fini(void) |
1da177e4 LT |
877 | { |
878 | struct w1_master *dev; | |
1da177e4 | 879 | |
7785925d | 880 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 881 | __w1_remove_master_device(dev); |
1da177e4 | 882 | |
674a396c | 883 | kthread_stop(w1_control_thread); |
1da177e4 | 884 | |
7f772ed8 EP |
885 | driver_unregister(&w1_slave_driver); |
886 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
887 | bus_unregister(&w1_bus_type); |
888 | } | |
889 | ||
890 | module_init(w1_init); | |
891 | module_exit(w1_fini); |