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" | |
1da177e4 LT |
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 | ||
abd52a13 | 57 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
58 | LIST_HEAD(w1_masters); |
59 | ||
674a396c | 60 | static struct task_struct *w1_control_thread; |
1da177e4 LT |
61 | |
62 | static int w1_master_match(struct device *dev, struct device_driver *drv) | |
63 | { | |
64 | return 1; | |
65 | } | |
66 | ||
67 | static int w1_master_probe(struct device *dev) | |
68 | { | |
69 | return -ENODEV; | |
70 | } | |
71 | ||
1da177e4 LT |
72 | static void w1_master_release(struct device *dev) |
73 | { | |
db2d0008 | 74 | struct w1_master *md = dev_to_w1_master(dev); |
3aca692d EP |
75 | |
76 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); | |
3aca692d EP |
77 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
78 | kfree(md); | |
1da177e4 LT |
79 | } |
80 | ||
81 | static void w1_slave_release(struct device *dev) | |
82 | { | |
db2d0008 | 83 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 84 | |
12003375 | 85 | printk("%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
86 | |
87 | while (atomic_read(&sl->refcnt)) { | |
12003375 | 88 | printk("Waiting for %s to become free: refcnt=%d.\n", |
3aca692d EP |
89 | sl->name, atomic_read(&sl->refcnt)); |
90 | if (msleep_interruptible(1000)) | |
91 | flush_signals(current); | |
92 | } | |
93 | ||
94 | w1_family_put(sl->family); | |
95 | sl->master->slave_count--; | |
96 | ||
97 | complete(&sl->released); | |
1da177e4 LT |
98 | } |
99 | ||
d2a4ef6a | 100 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 101 | { |
3aca692d | 102 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 103 | |
3aca692d | 104 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
105 | } |
106 | ||
d2a4ef6a | 107 | static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) |
1da177e4 | 108 | { |
3aca692d | 109 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
1da177e4 | 110 | |
3aca692d EP |
111 | if (off > 8) { |
112 | count = 0; | |
d2a4ef6a EP |
113 | } else { |
114 | if (off + count > 8) | |
115 | count = 8 - off; | |
116 | ||
117 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
118 | } | |
d2a4ef6a EP |
119 | |
120 | return count; | |
3aca692d | 121 | } |
d2a4ef6a EP |
122 | |
123 | static struct device_attribute w1_slave_attr_name = | |
124 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); | |
125 | ||
126 | static struct bin_attribute w1_slave_attr_bin_id = { | |
127 | .attr = { | |
128 | .name = "id", | |
129 | .mode = S_IRUGO, | |
130 | .owner = THIS_MODULE, | |
131 | }, | |
132 | .size = 8, | |
133 | .read = w1_slave_read_id, | |
7785925d EP |
134 | }; |
135 | ||
d2a4ef6a | 136 | /* Default family */ |
f522d239 EP |
137 | |
138 | static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
139 | { | |
140 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
141 | ||
abd52a13 | 142 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
143 | if (w1_reset_select_slave(sl)) { |
144 | count = 0; | |
145 | goto out_up; | |
146 | } | |
147 | ||
148 | w1_write_block(sl->master, buf, count); | |
149 | ||
150 | out_up: | |
abd52a13 | 151 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
152 | return count; |
153 | } | |
154 | ||
155 | static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
156 | { | |
157 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
158 | ||
abd52a13 | 159 | mutex_lock(&sl->master->mutex); |
f522d239 | 160 | w1_read_block(sl->master, buf, count); |
abd52a13 | 161 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
162 | return count; |
163 | } | |
164 | ||
165 | static struct bin_attribute w1_default_attr = { | |
166 | .attr = { | |
167 | .name = "rw", | |
168 | .mode = S_IRUGO | S_IWUSR, | |
169 | .owner = THIS_MODULE, | |
170 | }, | |
171 | .size = PAGE_SIZE, | |
172 | .read = w1_default_read, | |
173 | .write = w1_default_write, | |
174 | }; | |
175 | ||
176 | static int w1_default_add_slave(struct w1_slave *sl) | |
177 | { | |
178 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
179 | } | |
180 | ||
181 | static void w1_default_remove_slave(struct w1_slave *sl) | |
182 | { | |
183 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
184 | } | |
185 | ||
186 | static struct w1_family_ops w1_default_fops = { | |
187 | .add_slave = w1_default_add_slave, | |
188 | .remove_slave = w1_default_remove_slave, | |
189 | }; | |
190 | ||
191 | static struct w1_family w1_default_family = { | |
192 | .fops = &w1_default_fops, | |
193 | }; | |
d2a4ef6a | 194 | |
312c004d | 195 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 196 | |
1da177e4 LT |
197 | static struct bus_type w1_bus_type = { |
198 | .name = "w1", | |
199 | .match = w1_master_match, | |
312c004d | 200 | .uevent = w1_uevent, |
1da177e4 LT |
201 | }; |
202 | ||
7f772ed8 EP |
203 | struct device_driver w1_master_driver = { |
204 | .name = "w1_master_driver", | |
1da177e4 LT |
205 | .bus = &w1_bus_type, |
206 | .probe = w1_master_probe, | |
1da177e4 LT |
207 | }; |
208 | ||
7f772ed8 | 209 | struct device w1_master_device = { |
1da177e4 LT |
210 | .parent = NULL, |
211 | .bus = &w1_bus_type, | |
212 | .bus_id = "w1 bus master", | |
7f772ed8 | 213 | .driver = &w1_master_driver, |
1da177e4 LT |
214 | .release = &w1_master_release |
215 | }; | |
216 | ||
2c5bfdac | 217 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
218 | .name = "w1_slave_driver", |
219 | .bus = &w1_bus_type, | |
220 | }; | |
221 | ||
2c5bfdac | 222 | #if 0 |
7f772ed8 EP |
223 | struct device w1_slave_device = { |
224 | .parent = NULL, | |
225 | .bus = &w1_bus_type, | |
226 | .bus_id = "w1 bus slave", | |
227 | .driver = &w1_slave_driver, | |
3aca692d | 228 | .release = &w1_slave_release |
7f772ed8 | 229 | }; |
2c5bfdac | 230 | #endif /* 0 */ |
7f772ed8 | 231 | |
060b8845 | 232 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 233 | { |
db2d0008 | 234 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 235 | ssize_t count; |
7785925d | 236 | |
abd52a13 | 237 | mutex_lock(&md->mutex); |
1da177e4 | 238 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 239 | mutex_unlock(&md->mutex); |
1da177e4 LT |
240 | |
241 | return count; | |
242 | } | |
243 | ||
2a9d0c17 EP |
244 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
245 | struct device_attribute *attr, | |
246 | const char * buf, size_t count) | |
247 | { | |
db2d0008 | 248 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 | 249 | |
abd52a13 | 250 | mutex_lock(&md->mutex); |
2a9d0c17 | 251 | md->search_count = simple_strtol(buf, NULL, 0); |
abd52a13 | 252 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
253 | |
254 | return count; | |
255 | } | |
256 | ||
257 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
258 | struct device_attribute *attr, | |
259 | char *buf) | |
260 | { | |
db2d0008 | 261 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
262 | ssize_t count; |
263 | ||
abd52a13 | 264 | mutex_lock(&md->mutex); |
2a9d0c17 | 265 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 266 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
267 | |
268 | return count; | |
269 | } | |
270 | ||
060b8845 | 271 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 272 | { |
db2d0008 | 273 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 274 | ssize_t count; |
7785925d | 275 | |
abd52a13 | 276 | mutex_lock(&md->mutex); |
1da177e4 | 277 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 278 | mutex_unlock(&md->mutex); |
1da177e4 LT |
279 | return count; |
280 | } | |
281 | ||
060b8845 | 282 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
283 | { |
284 | ssize_t count; | |
285 | count = sprintf(buf, "%d\n", w1_timeout); | |
286 | return count; | |
287 | } | |
288 | ||
060b8845 | 289 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 290 | { |
db2d0008 | 291 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 292 | ssize_t count; |
7785925d | 293 | |
abd52a13 | 294 | mutex_lock(&md->mutex); |
1da177e4 | 295 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 296 | mutex_unlock(&md->mutex); |
1da177e4 LT |
297 | return count; |
298 | } | |
299 | ||
060b8845 | 300 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 301 | { |
db2d0008 | 302 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 303 | ssize_t count; |
7785925d | 304 | |
abd52a13 | 305 | mutex_lock(&md->mutex); |
1da177e4 | 306 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 307 | mutex_unlock(&md->mutex); |
1da177e4 LT |
308 | return count; |
309 | } | |
310 | ||
060b8845 | 311 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 312 | { |
db2d0008 | 313 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 314 | ssize_t count; |
7785925d | 315 | |
abd52a13 | 316 | mutex_lock(&md->mutex); |
1da177e4 | 317 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 318 | mutex_unlock(&md->mutex); |
1da177e4 LT |
319 | return count; |
320 | } | |
321 | ||
060b8845 | 322 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 323 | { |
db2d0008 | 324 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
325 | int c = PAGE_SIZE; |
326 | ||
abd52a13 | 327 | mutex_lock(&md->mutex); |
1da177e4 LT |
328 | |
329 | if (md->slave_count == 0) | |
330 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
331 | else { | |
332 | struct list_head *ent, *n; | |
333 | struct w1_slave *sl; | |
334 | ||
335 | list_for_each_safe(ent, n, &md->slist) { | |
336 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
337 | ||
7785925d | 338 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
339 | } |
340 | } | |
341 | ||
abd52a13 | 342 | mutex_unlock(&md->mutex); |
1da177e4 LT |
343 | |
344 | return PAGE_SIZE - c; | |
345 | } | |
346 | ||
7785925d EP |
347 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
348 | struct device_attribute w1_master_attribute_##_name = \ | |
349 | __ATTR(w1_master_##_name, _mode, \ | |
350 | w1_master_attribute_show_##_name, NULL) | |
351 | ||
2a9d0c17 EP |
352 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
353 | struct device_attribute w1_master_attribute_##_name = \ | |
354 | __ATTR(w1_master_##_name, _mode, \ | |
355 | w1_master_attribute_show_##_name, \ | |
356 | w1_master_attribute_store_##_name) | |
357 | ||
7785925d EP |
358 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
359 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
360 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
361 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
362 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
363 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
364 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 365 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
366 | |
367 | static struct attribute *w1_master_default_attrs[] = { | |
368 | &w1_master_attribute_name.attr, | |
369 | &w1_master_attribute_slaves.attr, | |
370 | &w1_master_attribute_slave_count.attr, | |
371 | &w1_master_attribute_max_slave_count.attr, | |
372 | &w1_master_attribute_attempts.attr, | |
373 | &w1_master_attribute_timeout.attr, | |
374 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 375 | &w1_master_attribute_search.attr, |
7785925d | 376 | NULL |
1da177e4 LT |
377 | }; |
378 | ||
7785925d EP |
379 | static struct attribute_group w1_master_defattr_group = { |
380 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
381 | }; |
382 | ||
7785925d EP |
383 | int w1_create_master_attributes(struct w1_master *master) |
384 | { | |
385 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
386 | } | |
387 | ||
2c5bfdac | 388 | static void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
389 | { |
390 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
391 | } | |
392 | ||
7f772ed8 | 393 | #ifdef CONFIG_HOTPLUG |
c6976a4e AM |
394 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
395 | char *buffer, int buffer_size) | |
7f772ed8 EP |
396 | { |
397 | struct w1_master *md = NULL; | |
398 | struct w1_slave *sl = NULL; | |
399 | char *event_owner, *name; | |
400 | int err, cur_index=0, cur_len=0; | |
401 | ||
402 | if (dev->driver == &w1_master_driver) { | |
403 | md = container_of(dev, struct w1_master, dev); | |
404 | event_owner = "master"; | |
405 | name = md->name; | |
406 | } else if (dev->driver == &w1_slave_driver) { | |
407 | sl = container_of(dev, struct w1_slave, dev); | |
408 | event_owner = "slave"; | |
409 | name = sl->name; | |
410 | } else { | |
312c004d | 411 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
412 | return -EINVAL; |
413 | } | |
414 | ||
c6976a4e AM |
415 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
416 | event_owner, name, dev->bus_id); | |
7f772ed8 EP |
417 | |
418 | if (dev->driver != &w1_slave_driver || !sl) | |
419 | return 0; | |
420 | ||
c6976a4e AM |
421 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
422 | &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
7f772ed8 EP |
423 | if (err) |
424 | return err; | |
425 | ||
c6976a4e AM |
426 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
427 | &cur_len, "W1_SLAVE_ID=%024LX", | |
428 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
429 | if (err) |
430 | return err; | |
431 | ||
432 | return 0; | |
433 | }; | |
434 | #else | |
c6976a4e AM |
435 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
436 | char *buffer, int buffer_size) | |
7f772ed8 EP |
437 | { |
438 | return 0; | |
439 | } | |
440 | #endif | |
441 | ||
1da177e4 LT |
442 | static int __w1_attach_slave_device(struct w1_slave *sl) |
443 | { | |
444 | int err; | |
445 | ||
446 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 447 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
448 | sl->dev.bus = &w1_bus_type; |
449 | sl->dev.release = &w1_slave_release; | |
450 | ||
451 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
452 | "%02x-%012llx", |
453 | (unsigned int) sl->reg_num.family, | |
454 | (unsigned long long) sl->reg_num.id); | |
455 | snprintf(&sl->name[0], sizeof(sl->name), | |
456 | "%02x-%012llx", | |
457 | (unsigned int) sl->reg_num.family, | |
458 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 459 | |
c6976a4e AM |
460 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
461 | &sl->dev.bus_id[0]); | |
1da177e4 LT |
462 | |
463 | err = device_register(&sl->dev); | |
464 | if (err < 0) { | |
465 | dev_err(&sl->dev, | |
6b729861 EP |
466 | "Device registration [%s] failed. err=%d\n", |
467 | sl->dev.bus_id, err); | |
1da177e4 LT |
468 | return err; |
469 | } | |
470 | ||
d2a4ef6a EP |
471 | /* Create "name" entry */ |
472 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
473 | if (err < 0) { | |
474 | dev_err(&sl->dev, | |
475 | "sysfs file creation for [%s] failed. err=%d\n", | |
476 | sl->dev.bus_id, err); | |
477 | goto out_unreg; | |
478 | } | |
1da177e4 | 479 | |
d2a4ef6a EP |
480 | /* Create "id" entry */ |
481 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
482 | if (err < 0) { |
483 | dev_err(&sl->dev, | |
6b729861 EP |
484 | "sysfs file creation for [%s] failed. err=%d\n", |
485 | sl->dev.bus_id, err); | |
d2a4ef6a | 486 | goto out_rem1; |
1da177e4 LT |
487 | } |
488 | ||
d2a4ef6a EP |
489 | /* if the family driver needs to initialize something... */ |
490 | if (sl->family->fops && sl->family->fops->add_slave && | |
491 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
492 | dev_err(&sl->dev, | |
493 | "sysfs file creation for [%s] failed. err=%d\n", | |
494 | sl->dev.bus_id, err); | |
495 | goto out_rem2; | |
1da177e4 LT |
496 | } |
497 | ||
498 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
499 | ||
500 | return 0; | |
d2a4ef6a EP |
501 | |
502 | out_rem2: | |
503 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
504 | out_rem1: | |
505 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
506 | out_unreg: | |
507 | device_unregister(&sl->dev); | |
508 | return err; | |
1da177e4 LT |
509 | } |
510 | ||
511 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
512 | { | |
513 | struct w1_slave *sl; | |
514 | struct w1_family *f; | |
515 | int err; | |
516 | struct w1_netlink_msg msg; | |
517 | ||
518 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
519 | if (!sl) { | |
520 | dev_err(&dev->dev, | |
521 | "%s: failed to allocate new slave device.\n", | |
522 | __func__); | |
523 | return -ENOMEM; | |
524 | } | |
525 | ||
526 | memset(sl, 0, sizeof(*sl)); | |
527 | ||
528 | sl->owner = THIS_MODULE; | |
529 | sl->master = dev; | |
530 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
531 | ||
12003375 | 532 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
533 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
534 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 535 | init_completion(&sl->released); |
1da177e4 LT |
536 | |
537 | spin_lock(&w1_flock); | |
538 | f = w1_family_registered(rn->family); | |
539 | if (!f) { | |
99c5bfe9 | 540 | f= &w1_default_family; |
1da177e4 LT |
541 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
542 | rn->family, rn->family, | |
543 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
544 | } |
545 | __w1_family_get(f); | |
546 | spin_unlock(&w1_flock); | |
547 | ||
548 | sl->family = f; | |
549 | ||
550 | ||
551 | err = __w1_attach_slave_device(sl); | |
552 | if (err < 0) { | |
553 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
554 | sl->name); | |
555 | w1_family_put(sl->family); | |
556 | kfree(sl); | |
557 | return err; | |
558 | } | |
559 | ||
560 | sl->ttl = dev->slave_ttl; | |
561 | dev->slave_count++; | |
562 | ||
12003375 | 563 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
564 | msg.type = W1_SLAVE_ADD; |
565 | w1_netlink_send(dev, &msg); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static void w1_slave_detach(struct w1_slave *sl) | |
571 | { | |
572 | struct w1_netlink_msg msg; | |
7785925d | 573 | |
7c8f5703 | 574 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 575 | |
3aca692d | 576 | list_del(&sl->w1_slave_entry); |
1da177e4 | 577 | |
d2a4ef6a EP |
578 | if (sl->family->fops && sl->family->fops->remove_slave) |
579 | sl->family->fops->remove_slave(sl); | |
580 | ||
12003375 EP |
581 | memset(&msg, 0, sizeof(msg)); |
582 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
583 | msg.type = W1_SLAVE_REMOVE; |
584 | w1_netlink_send(sl->master, &msg); | |
585 | ||
d2a4ef6a EP |
586 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
587 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 588 | device_unregister(&sl->dev); |
1da177e4 | 589 | |
3aca692d EP |
590 | wait_for_completion(&sl->released); |
591 | kfree(sl); | |
1da177e4 LT |
592 | } |
593 | ||
ccd69940 | 594 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
595 | { |
596 | struct w1_master *dev; | |
597 | int found = 0; | |
7785925d | 598 | |
abd52a13 | 599 | mutex_lock(&w1_mlock); |
1da177e4 LT |
600 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
601 | if (dev->bus_master->data == data) { | |
602 | found = 1; | |
603 | atomic_inc(&dev->refcnt); | |
604 | break; | |
605 | } | |
606 | } | |
abd52a13 | 607 | mutex_unlock(&w1_mlock); |
1da177e4 LT |
608 | |
609 | return (found)?dev:NULL; | |
610 | } | |
611 | ||
12003375 EP |
612 | struct w1_master *w1_search_master_id(u32 id) |
613 | { | |
614 | struct w1_master *dev; | |
615 | int found = 0; | |
616 | ||
abd52a13 | 617 | mutex_lock(&w1_mlock); |
12003375 EP |
618 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
619 | if (dev->id == id) { | |
620 | found = 1; | |
621 | atomic_inc(&dev->refcnt); | |
622 | break; | |
623 | } | |
624 | } | |
abd52a13 | 625 | mutex_unlock(&w1_mlock); |
12003375 EP |
626 | |
627 | return (found)?dev:NULL; | |
628 | } | |
629 | ||
630 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
631 | { | |
632 | struct w1_master *dev; | |
633 | struct w1_slave *sl = NULL; | |
634 | int found = 0; | |
635 | ||
abd52a13 | 636 | mutex_lock(&w1_mlock); |
12003375 | 637 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 638 | mutex_lock(&dev->mutex); |
12003375 EP |
639 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
640 | if (sl->reg_num.family == id->family && | |
641 | sl->reg_num.id == id->id && | |
642 | sl->reg_num.crc == id->crc) { | |
643 | found = 1; | |
644 | atomic_inc(&dev->refcnt); | |
645 | atomic_inc(&sl->refcnt); | |
646 | break; | |
647 | } | |
648 | } | |
abd52a13 | 649 | mutex_unlock(&dev->mutex); |
12003375 EP |
650 | |
651 | if (found) | |
652 | break; | |
653 | } | |
abd52a13 | 654 | mutex_unlock(&w1_mlock); |
12003375 EP |
655 | |
656 | return (found)?sl:NULL; | |
657 | } | |
658 | ||
6adf87bd EP |
659 | void w1_reconnect_slaves(struct w1_family *f) |
660 | { | |
661 | struct w1_master *dev; | |
662 | ||
abd52a13 | 663 | mutex_lock(&w1_mlock); |
6adf87bd | 664 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
7c8f5703 | 665 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
666 | dev->name, f->fid); |
667 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
668 | } | |
abd52a13 | 669 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
670 | } |
671 | ||
ccd69940 | 672 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
673 | { |
674 | int slave_count; | |
675 | struct w1_slave *sl; | |
676 | struct list_head *ent; | |
677 | struct w1_reg_num *tmp; | |
678 | int family_found = 0; | |
679 | struct w1_master *dev; | |
0e65f828 | 680 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
681 | |
682 | dev = w1_search_master(data); | |
683 | if (!dev) { | |
ccd69940 EP |
684 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
685 | "it is impossible.\n", data); | |
1da177e4 LT |
686 | return; |
687 | } | |
7785925d | 688 | |
1da177e4 LT |
689 | tmp = (struct w1_reg_num *) &rn; |
690 | ||
691 | slave_count = 0; | |
692 | list_for_each(ent, &dev->slist) { | |
693 | ||
694 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
695 | ||
696 | if (sl->reg_num.family == tmp->family && | |
697 | sl->reg_num.id == tmp->id && | |
698 | sl->reg_num.crc == tmp->crc) { | |
699 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
700 | break; | |
7785925d | 701 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
702 | family_found = 1; |
703 | break; | |
704 | } | |
705 | ||
706 | slave_count++; | |
707 | } | |
708 | ||
8523ff45 | 709 | if (slave_count == dev->slave_count && |
0e65f828 | 710 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 711 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 712 | } |
7785925d | 713 | |
1da177e4 LT |
714 | atomic_dec(&dev->refcnt); |
715 | } | |
716 | ||
6b729861 EP |
717 | /** |
718 | * Performs a ROM Search & registers any devices found. | |
719 | * The 1-wire search is a simple binary tree search. | |
720 | * For each bit of the address, we read two bits and write one bit. | |
721 | * The bit written will put to sleep all devies that don't match that bit. | |
722 | * When the two reads differ, the direction choice is obvious. | |
723 | * When both bits are 0, we must choose a path to take. | |
724 | * When we can scan all 64 bits without having to choose a path, we are done. | |
725 | * | |
726 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
727 | * | |
728 | * @dev The master device to search | |
729 | * @cb Function to call when a device is found | |
730 | */ | |
12003375 | 731 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 732 | { |
6b729861 EP |
733 | u64 last_rn, rn, tmp64; |
734 | int i, slave_count = 0; | |
735 | int last_zero, last_device; | |
736 | int search_bit, desc_bit; | |
737 | u8 triplet_ret = 0; | |
1da177e4 | 738 | |
6b729861 EP |
739 | search_bit = 0; |
740 | rn = last_rn = 0; | |
741 | last_device = 0; | |
742 | last_zero = -1; | |
1da177e4 LT |
743 | |
744 | desc_bit = 64; | |
745 | ||
6b729861 EP |
746 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
747 | last_rn = rn; | |
1da177e4 LT |
748 | rn = 0; |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Reset bus and all 1-wire device state machines | |
752 | * so they can respond to our requests. | |
753 | * | |
754 | * Return 0 - device(s) present, 1 - no devices present. | |
755 | */ | |
756 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 757 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
758 | break; |
759 | } | |
760 | ||
6b729861 | 761 | /* Start the search */ |
12003375 | 762 | w1_write_8(dev, search_type); |
1da177e4 | 763 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
764 | /* Determine the direction/search bit */ |
765 | if (i == desc_bit) | |
766 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
767 | else if (i > desc_bit) | |
768 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 769 | else |
6b729861 | 770 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 771 | |
6b729861 EP |
772 | /** Read two bits and write one bit */ |
773 | triplet_ret = w1_triplet(dev, search_bit); | |
774 | ||
775 | /* quit if no device responded */ | |
776 | if ( (triplet_ret & 0x03) == 0x03 ) | |
777 | break; | |
1da177e4 | 778 | |
6b729861 EP |
779 | /* If both directions were valid, and we took the 0 path... */ |
780 | if (triplet_ret == 0) | |
781 | last_zero = i; | |
1da177e4 | 782 | |
6b729861 EP |
783 | /* extract the direction taken & update the device number */ |
784 | tmp64 = (triplet_ret >> 2); | |
785 | rn |= (tmp64 << i); | |
786 | } | |
7785925d | 787 | |
6b729861 EP |
788 | if ( (triplet_ret & 0x03) != 0x03 ) { |
789 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
790 | last_device = 1; | |
791 | desc_bit = last_zero; | |
792 | cb(dev->bus_master->data, rn); | |
793 | } | |
1da177e4 LT |
794 | } |
795 | } | |
796 | ||
7785925d | 797 | static int w1_control(void *data) |
1da177e4 | 798 | { |
7785925d EP |
799 | struct w1_slave *sl, *sln; |
800 | struct w1_master *dev, *n; | |
674a396c | 801 | int have_to_wait = 0; |
1da177e4 | 802 | |
674a396c | 803 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
804 | have_to_wait = 0; |
805 | ||
3e1d1d28 | 806 | try_to_freeze(); |
3aca692d | 807 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 808 | |
7785925d | 809 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 810 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
811 | continue; |
812 | /* | |
813 | * Little race: we can create thread but not set the flag. | |
814 | * Get a chance for external process to set flag up. | |
815 | */ | |
816 | if (!dev->initialized) { | |
817 | have_to_wait = 1; | |
818 | continue; | |
819 | } | |
820 | ||
674a396c | 821 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 822 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 823 | |
abd52a13 | 824 | mutex_lock(&w1_mlock); |
6adf87bd | 825 | list_del(&dev->w1_master_entry); |
abd52a13 | 826 | mutex_unlock(&w1_mlock); |
6adf87bd | 827 | |
abd52a13 | 828 | mutex_lock(&dev->mutex); |
6adf87bd | 829 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 830 | w1_slave_detach(sl); |
6adf87bd EP |
831 | } |
832 | w1_destroy_master_attributes(dev); | |
abd52a13 | 833 | mutex_unlock(&dev->mutex); |
6adf87bd EP |
834 | atomic_dec(&dev->refcnt); |
835 | continue; | |
836 | } | |
837 | ||
838 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 839 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
abd52a13 | 840 | mutex_lock(&dev->mutex); |
3aca692d | 841 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
842 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
843 | struct w1_reg_num rn; | |
6adf87bd EP |
844 | |
845 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 846 | w1_slave_detach(sl); |
1da177e4 | 847 | |
6adf87bd EP |
848 | w1_attach_slave_device(dev, &rn); |
849 | } | |
850 | } | |
7c8f5703 | 851 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd | 852 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
abd52a13 | 853 | mutex_unlock(&dev->mutex); |
1da177e4 | 854 | } |
1da177e4 LT |
855 | } |
856 | } | |
857 | ||
674a396c | 858 | return 0; |
1da177e4 LT |
859 | } |
860 | ||
12003375 EP |
861 | void w1_search_process(struct w1_master *dev, u8 search_type) |
862 | { | |
863 | struct w1_slave *sl, *sln; | |
864 | ||
865 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
866 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
867 | ||
868 | w1_search_devices(dev, search_type, w1_slave_found); | |
869 | ||
870 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
871 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
872 | w1_slave_detach(sl); | |
873 | ||
874 | dev->slave_count--; | |
875 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) | |
876 | sl->ttl = dev->slave_ttl; | |
877 | } | |
878 | ||
879 | if (dev->search_count > 0) | |
880 | dev->search_count--; | |
881 | } | |
882 | ||
1da177e4 LT |
883 | int w1_process(void *data) |
884 | { | |
885 | struct w1_master *dev = (struct w1_master *) data; | |
1da177e4 | 886 | |
674a396c | 887 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 888 | try_to_freeze(); |
1da177e4 LT |
889 | msleep_interruptible(w1_timeout * 1000); |
890 | ||
674a396c | 891 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
892 | break; |
893 | ||
894 | if (!dev->initialized) | |
895 | continue; | |
896 | ||
2a9d0c17 EP |
897 | if (dev->search_count == 0) |
898 | continue; | |
899 | ||
abd52a13 | 900 | mutex_lock(&dev->mutex); |
12003375 | 901 | w1_search_process(dev, W1_SEARCH); |
abd52a13 | 902 | mutex_unlock(&dev->mutex); |
1da177e4 LT |
903 | } |
904 | ||
905 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
906 | |
907 | return 0; | |
908 | } | |
909 | ||
7785925d | 910 | static int w1_init(void) |
1da177e4 LT |
911 | { |
912 | int retval; | |
913 | ||
914 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
915 | ||
12003375 EP |
916 | w1_init_netlink(); |
917 | ||
1da177e4 LT |
918 | retval = bus_register(&w1_bus_type); |
919 | if (retval) { | |
920 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
921 | goto err_out_exit_init; | |
922 | } | |
923 | ||
7f772ed8 | 924 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
925 | if (retval) { |
926 | printk(KERN_ERR | |
927 | "Failed to register master driver. err=%d.\n", | |
928 | retval); | |
929 | goto err_out_bus_unregister; | |
930 | } | |
931 | ||
7f772ed8 EP |
932 | retval = driver_register(&w1_slave_driver); |
933 | if (retval) { | |
934 | printk(KERN_ERR | |
935 | "Failed to register master driver. err=%d.\n", | |
936 | retval); | |
937 | goto err_out_master_unregister; | |
938 | } | |
939 | ||
674a396c EP |
940 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
941 | if (IS_ERR(w1_control_thread)) { | |
942 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 943 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 944 | retval); |
7f772ed8 | 945 | goto err_out_slave_unregister; |
1da177e4 LT |
946 | } |
947 | ||
948 | return 0; | |
949 | ||
7f772ed8 EP |
950 | err_out_slave_unregister: |
951 | driver_unregister(&w1_slave_driver); | |
952 | ||
953 | err_out_master_unregister: | |
954 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
955 | |
956 | err_out_bus_unregister: | |
957 | bus_unregister(&w1_bus_type); | |
958 | ||
959 | err_out_exit_init: | |
960 | return retval; | |
961 | } | |
962 | ||
7785925d | 963 | static void w1_fini(void) |
1da177e4 LT |
964 | { |
965 | struct w1_master *dev; | |
1da177e4 | 966 | |
7785925d | 967 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 968 | __w1_remove_master_device(dev); |
1da177e4 | 969 | |
12003375 EP |
970 | w1_fini_netlink(); |
971 | ||
674a396c | 972 | kthread_stop(w1_control_thread); |
1da177e4 | 973 | |
7f772ed8 EP |
974 | driver_unregister(&w1_slave_driver); |
975 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
976 | bus_unregister(&w1_bus_type); |
977 | } | |
978 | ||
979 | module_init(w1_init); | |
980 | module_exit(w1_fini); |