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Commit | Line | Data |
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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 | ||
12003375 | 57 | DECLARE_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 | ||
142 | if (down_interruptible(&sl->master->mutex)) { | |
143 | count = 0; | |
144 | goto out; | |
145 | } | |
146 | ||
147 | if (w1_reset_select_slave(sl)) { | |
148 | count = 0; | |
149 | goto out_up; | |
150 | } | |
151 | ||
152 | w1_write_block(sl->master, buf, count); | |
153 | ||
154 | out_up: | |
155 | up(&sl->master->mutex); | |
156 | out: | |
157 | return count; | |
158 | } | |
159 | ||
160 | static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
161 | { | |
162 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
163 | ||
164 | if (down_interruptible(&sl->master->mutex)) { | |
165 | count = 0; | |
166 | goto out; | |
167 | } | |
168 | ||
169 | w1_read_block(sl->master, buf, count); | |
170 | ||
171 | up(&sl->master->mutex); | |
172 | out: | |
173 | return count; | |
174 | } | |
175 | ||
176 | static struct bin_attribute w1_default_attr = { | |
177 | .attr = { | |
178 | .name = "rw", | |
179 | .mode = S_IRUGO | S_IWUSR, | |
180 | .owner = THIS_MODULE, | |
181 | }, | |
182 | .size = PAGE_SIZE, | |
183 | .read = w1_default_read, | |
184 | .write = w1_default_write, | |
185 | }; | |
186 | ||
187 | static int w1_default_add_slave(struct w1_slave *sl) | |
188 | { | |
189 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
190 | } | |
191 | ||
192 | static void w1_default_remove_slave(struct w1_slave *sl) | |
193 | { | |
194 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
195 | } | |
196 | ||
197 | static struct w1_family_ops w1_default_fops = { | |
198 | .add_slave = w1_default_add_slave, | |
199 | .remove_slave = w1_default_remove_slave, | |
200 | }; | |
201 | ||
202 | static struct w1_family w1_default_family = { | |
203 | .fops = &w1_default_fops, | |
204 | }; | |
d2a4ef6a | 205 | |
312c004d | 206 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 207 | |
1da177e4 LT |
208 | static struct bus_type w1_bus_type = { |
209 | .name = "w1", | |
210 | .match = w1_master_match, | |
312c004d | 211 | .uevent = w1_uevent, |
1da177e4 LT |
212 | }; |
213 | ||
7f772ed8 EP |
214 | struct device_driver w1_master_driver = { |
215 | .name = "w1_master_driver", | |
1da177e4 LT |
216 | .bus = &w1_bus_type, |
217 | .probe = w1_master_probe, | |
1da177e4 LT |
218 | }; |
219 | ||
7f772ed8 | 220 | struct device w1_master_device = { |
1da177e4 LT |
221 | .parent = NULL, |
222 | .bus = &w1_bus_type, | |
223 | .bus_id = "w1 bus master", | |
7f772ed8 | 224 | .driver = &w1_master_driver, |
1da177e4 LT |
225 | .release = &w1_master_release |
226 | }; | |
227 | ||
12003375 | 228 | struct device_driver w1_slave_driver = { |
7f772ed8 EP |
229 | .name = "w1_slave_driver", |
230 | .bus = &w1_bus_type, | |
231 | }; | |
232 | ||
233 | struct device w1_slave_device = { | |
234 | .parent = NULL, | |
235 | .bus = &w1_bus_type, | |
236 | .bus_id = "w1 bus slave", | |
237 | .driver = &w1_slave_driver, | |
3aca692d | 238 | .release = &w1_slave_release |
7f772ed8 EP |
239 | }; |
240 | ||
060b8845 | 241 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 242 | { |
db2d0008 | 243 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 244 | ssize_t count; |
7785925d | 245 | |
1da177e4 LT |
246 | if (down_interruptible (&md->mutex)) |
247 | return -EBUSY; | |
248 | ||
249 | count = sprintf(buf, "%s\n", md->name); | |
7785925d | 250 | |
1da177e4 LT |
251 | up(&md->mutex); |
252 | ||
253 | return count; | |
254 | } | |
255 | ||
2a9d0c17 EP |
256 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
257 | struct device_attribute *attr, | |
258 | const char * buf, size_t count) | |
259 | { | |
db2d0008 | 260 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
261 | |
262 | if (down_interruptible (&md->mutex)) | |
263 | return -EBUSY; | |
264 | ||
265 | md->search_count = simple_strtol(buf, NULL, 0); | |
266 | ||
267 | up(&md->mutex); | |
268 | ||
269 | return count; | |
270 | } | |
271 | ||
272 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
273 | struct device_attribute *attr, | |
274 | char *buf) | |
275 | { | |
db2d0008 | 276 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
277 | ssize_t count; |
278 | ||
279 | if (down_interruptible (&md->mutex)) | |
280 | return -EBUSY; | |
281 | ||
282 | count = sprintf(buf, "%d\n", md->search_count); | |
283 | ||
284 | up(&md->mutex); | |
285 | ||
286 | return count; | |
287 | } | |
288 | ||
060b8845 | 289 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 290 | { |
db2d0008 | 291 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 292 | ssize_t count; |
7785925d | 293 | |
1da177e4 LT |
294 | if (down_interruptible(&md->mutex)) |
295 | return -EBUSY; | |
296 | ||
297 | count = sprintf(buf, "0x%p\n", md->bus_master); | |
7785925d | 298 | |
1da177e4 LT |
299 | up(&md->mutex); |
300 | return count; | |
301 | } | |
302 | ||
060b8845 | 303 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
304 | { |
305 | ssize_t count; | |
306 | count = sprintf(buf, "%d\n", w1_timeout); | |
307 | return count; | |
308 | } | |
309 | ||
060b8845 | 310 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 311 | { |
db2d0008 | 312 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 313 | ssize_t count; |
7785925d | 314 | |
1da177e4 LT |
315 | if (down_interruptible(&md->mutex)) |
316 | return -EBUSY; | |
317 | ||
318 | count = sprintf(buf, "%d\n", md->max_slave_count); | |
7785925d | 319 | |
1da177e4 LT |
320 | up(&md->mutex); |
321 | return count; | |
322 | } | |
323 | ||
060b8845 | 324 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 325 | { |
db2d0008 | 326 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 327 | ssize_t count; |
7785925d | 328 | |
1da177e4 LT |
329 | if (down_interruptible(&md->mutex)) |
330 | return -EBUSY; | |
331 | ||
332 | count = sprintf(buf, "%lu\n", md->attempts); | |
7785925d | 333 | |
1da177e4 LT |
334 | up(&md->mutex); |
335 | return count; | |
336 | } | |
337 | ||
060b8845 | 338 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 339 | { |
db2d0008 | 340 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 341 | ssize_t count; |
7785925d | 342 | |
1da177e4 LT |
343 | if (down_interruptible(&md->mutex)) |
344 | return -EBUSY; | |
345 | ||
346 | count = sprintf(buf, "%d\n", md->slave_count); | |
7785925d | 347 | |
1da177e4 LT |
348 | up(&md->mutex); |
349 | return count; | |
350 | } | |
351 | ||
060b8845 | 352 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 353 | { |
db2d0008 | 354 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
355 | int c = PAGE_SIZE; |
356 | ||
357 | if (down_interruptible(&md->mutex)) | |
358 | return -EBUSY; | |
359 | ||
360 | if (md->slave_count == 0) | |
361 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
362 | else { | |
363 | struct list_head *ent, *n; | |
364 | struct w1_slave *sl; | |
365 | ||
366 | list_for_each_safe(ent, n, &md->slist) { | |
367 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
368 | ||
7785925d | 369 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
370 | } |
371 | } | |
372 | ||
373 | up(&md->mutex); | |
374 | ||
375 | return PAGE_SIZE - c; | |
376 | } | |
377 | ||
7785925d EP |
378 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
379 | struct device_attribute w1_master_attribute_##_name = \ | |
380 | __ATTR(w1_master_##_name, _mode, \ | |
381 | w1_master_attribute_show_##_name, NULL) | |
382 | ||
2a9d0c17 EP |
383 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
384 | struct device_attribute w1_master_attribute_##_name = \ | |
385 | __ATTR(w1_master_##_name, _mode, \ | |
386 | w1_master_attribute_show_##_name, \ | |
387 | w1_master_attribute_store_##_name) | |
388 | ||
7785925d EP |
389 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
390 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
391 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
392 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
393 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
394 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
395 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 396 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
397 | |
398 | static struct attribute *w1_master_default_attrs[] = { | |
399 | &w1_master_attribute_name.attr, | |
400 | &w1_master_attribute_slaves.attr, | |
401 | &w1_master_attribute_slave_count.attr, | |
402 | &w1_master_attribute_max_slave_count.attr, | |
403 | &w1_master_attribute_attempts.attr, | |
404 | &w1_master_attribute_timeout.attr, | |
405 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 406 | &w1_master_attribute_search.attr, |
7785925d | 407 | NULL |
1da177e4 LT |
408 | }; |
409 | ||
7785925d EP |
410 | static struct attribute_group w1_master_defattr_group = { |
411 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
412 | }; |
413 | ||
7785925d EP |
414 | int w1_create_master_attributes(struct w1_master *master) |
415 | { | |
416 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
417 | } | |
418 | ||
12003375 | 419 | void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
420 | { |
421 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
422 | } | |
423 | ||
7f772ed8 | 424 | #ifdef CONFIG_HOTPLUG |
312c004d | 425 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
426 | { |
427 | struct w1_master *md = NULL; | |
428 | struct w1_slave *sl = NULL; | |
429 | char *event_owner, *name; | |
430 | int err, cur_index=0, cur_len=0; | |
431 | ||
432 | if (dev->driver == &w1_master_driver) { | |
433 | md = container_of(dev, struct w1_master, dev); | |
434 | event_owner = "master"; | |
435 | name = md->name; | |
436 | } else if (dev->driver == &w1_slave_driver) { | |
437 | sl = container_of(dev, struct w1_slave, dev); | |
438 | event_owner = "slave"; | |
439 | name = sl->name; | |
440 | } else { | |
312c004d | 441 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
442 | return -EINVAL; |
443 | } | |
444 | ||
445 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id); | |
446 | ||
447 | if (dev->driver != &w1_slave_driver || !sl) | |
448 | return 0; | |
449 | ||
12003375 | 450 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8 EP |
451 | if (err) |
452 | return err; | |
453 | ||
12003375 | 454 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id); |
7f772ed8 EP |
455 | if (err) |
456 | return err; | |
457 | ||
458 | return 0; | |
459 | }; | |
460 | #else | |
312c004d | 461 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
462 | { |
463 | return 0; | |
464 | } | |
465 | #endif | |
466 | ||
1da177e4 LT |
467 | static int __w1_attach_slave_device(struct w1_slave *sl) |
468 | { | |
469 | int err; | |
470 | ||
471 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 472 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
473 | sl->dev.bus = &w1_bus_type; |
474 | sl->dev.release = &w1_slave_release; | |
475 | ||
476 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
477 | "%02x-%012llx", |
478 | (unsigned int) sl->reg_num.family, | |
479 | (unsigned long long) sl->reg_num.id); | |
480 | snprintf(&sl->name[0], sizeof(sl->name), | |
481 | "%02x-%012llx", | |
482 | (unsigned int) sl->reg_num.family, | |
483 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 484 | |
3aca692d | 485 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); |
1da177e4 LT |
486 | |
487 | err = device_register(&sl->dev); | |
488 | if (err < 0) { | |
489 | dev_err(&sl->dev, | |
6b729861 EP |
490 | "Device registration [%s] failed. err=%d\n", |
491 | sl->dev.bus_id, err); | |
1da177e4 LT |
492 | return err; |
493 | } | |
494 | ||
d2a4ef6a EP |
495 | /* Create "name" entry */ |
496 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
497 | if (err < 0) { | |
498 | dev_err(&sl->dev, | |
499 | "sysfs file creation for [%s] failed. err=%d\n", | |
500 | sl->dev.bus_id, err); | |
501 | goto out_unreg; | |
502 | } | |
1da177e4 | 503 | |
d2a4ef6a EP |
504 | /* Create "id" entry */ |
505 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
506 | if (err < 0) { |
507 | dev_err(&sl->dev, | |
6b729861 EP |
508 | "sysfs file creation for [%s] failed. err=%d\n", |
509 | sl->dev.bus_id, err); | |
d2a4ef6a | 510 | goto out_rem1; |
1da177e4 LT |
511 | } |
512 | ||
d2a4ef6a EP |
513 | /* if the family driver needs to initialize something... */ |
514 | if (sl->family->fops && sl->family->fops->add_slave && | |
515 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
516 | dev_err(&sl->dev, | |
517 | "sysfs file creation for [%s] failed. err=%d\n", | |
518 | sl->dev.bus_id, err); | |
519 | goto out_rem2; | |
1da177e4 LT |
520 | } |
521 | ||
522 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
523 | ||
524 | return 0; | |
d2a4ef6a EP |
525 | |
526 | out_rem2: | |
527 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
528 | out_rem1: | |
529 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
530 | out_unreg: | |
531 | device_unregister(&sl->dev); | |
532 | return err; | |
1da177e4 LT |
533 | } |
534 | ||
535 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
536 | { | |
537 | struct w1_slave *sl; | |
538 | struct w1_family *f; | |
539 | int err; | |
540 | struct w1_netlink_msg msg; | |
541 | ||
542 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
543 | if (!sl) { | |
544 | dev_err(&dev->dev, | |
545 | "%s: failed to allocate new slave device.\n", | |
546 | __func__); | |
547 | return -ENOMEM; | |
548 | } | |
549 | ||
550 | memset(sl, 0, sizeof(*sl)); | |
551 | ||
552 | sl->owner = THIS_MODULE; | |
553 | sl->master = dev; | |
554 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
555 | ||
12003375 | 556 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
557 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
558 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 559 | init_completion(&sl->released); |
1da177e4 LT |
560 | |
561 | spin_lock(&w1_flock); | |
562 | f = w1_family_registered(rn->family); | |
563 | if (!f) { | |
99c5bfe9 | 564 | f= &w1_default_family; |
1da177e4 LT |
565 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
566 | rn->family, rn->family, | |
567 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
568 | } |
569 | __w1_family_get(f); | |
570 | spin_unlock(&w1_flock); | |
571 | ||
572 | sl->family = f; | |
573 | ||
574 | ||
575 | err = __w1_attach_slave_device(sl); | |
576 | if (err < 0) { | |
577 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
578 | sl->name); | |
579 | w1_family_put(sl->family); | |
580 | kfree(sl); | |
581 | return err; | |
582 | } | |
583 | ||
584 | sl->ttl = dev->slave_ttl; | |
585 | dev->slave_count++; | |
586 | ||
12003375 | 587 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
588 | msg.type = W1_SLAVE_ADD; |
589 | w1_netlink_send(dev, &msg); | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static void w1_slave_detach(struct w1_slave *sl) | |
595 | { | |
596 | struct w1_netlink_msg msg; | |
7785925d | 597 | |
7c8f5703 | 598 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 599 | |
3aca692d | 600 | list_del(&sl->w1_slave_entry); |
1da177e4 | 601 | |
d2a4ef6a EP |
602 | if (sl->family->fops && sl->family->fops->remove_slave) |
603 | sl->family->fops->remove_slave(sl); | |
604 | ||
12003375 EP |
605 | memset(&msg, 0, sizeof(msg)); |
606 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
607 | msg.type = W1_SLAVE_REMOVE; |
608 | w1_netlink_send(sl->master, &msg); | |
609 | ||
d2a4ef6a EP |
610 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
611 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 612 | device_unregister(&sl->dev); |
1da177e4 | 613 | |
3aca692d EP |
614 | wait_for_completion(&sl->released); |
615 | kfree(sl); | |
1da177e4 LT |
616 | } |
617 | ||
ccd69940 | 618 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
619 | { |
620 | struct w1_master *dev; | |
621 | int found = 0; | |
7785925d | 622 | |
12003375 | 623 | down(&w1_mlock); |
1da177e4 LT |
624 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
625 | if (dev->bus_master->data == data) { | |
626 | found = 1; | |
627 | atomic_inc(&dev->refcnt); | |
628 | break; | |
629 | } | |
630 | } | |
12003375 | 631 | up(&w1_mlock); |
1da177e4 LT |
632 | |
633 | return (found)?dev:NULL; | |
634 | } | |
635 | ||
12003375 EP |
636 | struct w1_master *w1_search_master_id(u32 id) |
637 | { | |
638 | struct w1_master *dev; | |
639 | int found = 0; | |
640 | ||
641 | down(&w1_mlock); | |
642 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
643 | if (dev->id == id) { | |
644 | found = 1; | |
645 | atomic_inc(&dev->refcnt); | |
646 | break; | |
647 | } | |
648 | } | |
649 | up(&w1_mlock); | |
650 | ||
651 | return (found)?dev:NULL; | |
652 | } | |
653 | ||
654 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
655 | { | |
656 | struct w1_master *dev; | |
657 | struct w1_slave *sl = NULL; | |
658 | int found = 0; | |
659 | ||
660 | down(&w1_mlock); | |
661 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
662 | down(&dev->mutex); | |
663 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { | |
664 | if (sl->reg_num.family == id->family && | |
665 | sl->reg_num.id == id->id && | |
666 | sl->reg_num.crc == id->crc) { | |
667 | found = 1; | |
668 | atomic_inc(&dev->refcnt); | |
669 | atomic_inc(&sl->refcnt); | |
670 | break; | |
671 | } | |
672 | } | |
673 | up(&dev->mutex); | |
674 | ||
675 | if (found) | |
676 | break; | |
677 | } | |
678 | up(&w1_mlock); | |
679 | ||
680 | return (found)?sl:NULL; | |
681 | } | |
682 | ||
6adf87bd EP |
683 | void w1_reconnect_slaves(struct w1_family *f) |
684 | { | |
685 | struct w1_master *dev; | |
686 | ||
12003375 | 687 | down(&w1_mlock); |
6adf87bd | 688 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
7c8f5703 | 689 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
690 | dev->name, f->fid); |
691 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
692 | } | |
12003375 | 693 | up(&w1_mlock); |
6adf87bd EP |
694 | } |
695 | ||
ccd69940 | 696 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
697 | { |
698 | int slave_count; | |
699 | struct w1_slave *sl; | |
700 | struct list_head *ent; | |
701 | struct w1_reg_num *tmp; | |
702 | int family_found = 0; | |
703 | struct w1_master *dev; | |
0e65f828 | 704 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
705 | |
706 | dev = w1_search_master(data); | |
707 | if (!dev) { | |
ccd69940 EP |
708 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
709 | "it is impossible.\n", data); | |
1da177e4 LT |
710 | return; |
711 | } | |
7785925d | 712 | |
1da177e4 LT |
713 | tmp = (struct w1_reg_num *) &rn; |
714 | ||
715 | slave_count = 0; | |
716 | list_for_each(ent, &dev->slist) { | |
717 | ||
718 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
719 | ||
720 | if (sl->reg_num.family == tmp->family && | |
721 | sl->reg_num.id == tmp->id && | |
722 | sl->reg_num.crc == tmp->crc) { | |
723 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
724 | break; | |
7785925d | 725 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
726 | family_found = 1; |
727 | break; | |
728 | } | |
729 | ||
730 | slave_count++; | |
731 | } | |
732 | ||
8523ff45 | 733 | if (slave_count == dev->slave_count && |
0e65f828 | 734 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 735 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 736 | } |
7785925d | 737 | |
1da177e4 LT |
738 | atomic_dec(&dev->refcnt); |
739 | } | |
740 | ||
6b729861 EP |
741 | /** |
742 | * Performs a ROM Search & registers any devices found. | |
743 | * The 1-wire search is a simple binary tree search. | |
744 | * For each bit of the address, we read two bits and write one bit. | |
745 | * The bit written will put to sleep all devies that don't match that bit. | |
746 | * When the two reads differ, the direction choice is obvious. | |
747 | * When both bits are 0, we must choose a path to take. | |
748 | * When we can scan all 64 bits without having to choose a path, we are done. | |
749 | * | |
750 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
751 | * | |
752 | * @dev The master device to search | |
753 | * @cb Function to call when a device is found | |
754 | */ | |
12003375 | 755 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 756 | { |
6b729861 EP |
757 | u64 last_rn, rn, tmp64; |
758 | int i, slave_count = 0; | |
759 | int last_zero, last_device; | |
760 | int search_bit, desc_bit; | |
761 | u8 triplet_ret = 0; | |
1da177e4 | 762 | |
6b729861 EP |
763 | search_bit = 0; |
764 | rn = last_rn = 0; | |
765 | last_device = 0; | |
766 | last_zero = -1; | |
1da177e4 LT |
767 | |
768 | desc_bit = 64; | |
769 | ||
6b729861 EP |
770 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
771 | last_rn = rn; | |
1da177e4 LT |
772 | rn = 0; |
773 | ||
1da177e4 LT |
774 | /* |
775 | * Reset bus and all 1-wire device state machines | |
776 | * so they can respond to our requests. | |
777 | * | |
778 | * Return 0 - device(s) present, 1 - no devices present. | |
779 | */ | |
780 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 781 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
782 | break; |
783 | } | |
784 | ||
6b729861 | 785 | /* Start the search */ |
12003375 | 786 | w1_write_8(dev, search_type); |
1da177e4 | 787 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
788 | /* Determine the direction/search bit */ |
789 | if (i == desc_bit) | |
790 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
791 | else if (i > desc_bit) | |
792 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 793 | else |
6b729861 | 794 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 795 | |
6b729861 EP |
796 | /** Read two bits and write one bit */ |
797 | triplet_ret = w1_triplet(dev, search_bit); | |
798 | ||
799 | /* quit if no device responded */ | |
800 | if ( (triplet_ret & 0x03) == 0x03 ) | |
801 | break; | |
1da177e4 | 802 | |
6b729861 EP |
803 | /* If both directions were valid, and we took the 0 path... */ |
804 | if (triplet_ret == 0) | |
805 | last_zero = i; | |
1da177e4 | 806 | |
6b729861 EP |
807 | /* extract the direction taken & update the device number */ |
808 | tmp64 = (triplet_ret >> 2); | |
809 | rn |= (tmp64 << i); | |
810 | } | |
7785925d | 811 | |
6b729861 EP |
812 | if ( (triplet_ret & 0x03) != 0x03 ) { |
813 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
814 | last_device = 1; | |
815 | desc_bit = last_zero; | |
816 | cb(dev->bus_master->data, rn); | |
817 | } | |
1da177e4 LT |
818 | } |
819 | } | |
820 | ||
7785925d | 821 | static int w1_control(void *data) |
1da177e4 | 822 | { |
7785925d EP |
823 | struct w1_slave *sl, *sln; |
824 | struct w1_master *dev, *n; | |
674a396c | 825 | int have_to_wait = 0; |
1da177e4 | 826 | |
674a396c | 827 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
828 | have_to_wait = 0; |
829 | ||
3e1d1d28 | 830 | try_to_freeze(); |
3aca692d | 831 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 832 | |
7785925d | 833 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 834 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
835 | continue; |
836 | /* | |
837 | * Little race: we can create thread but not set the flag. | |
838 | * Get a chance for external process to set flag up. | |
839 | */ | |
840 | if (!dev->initialized) { | |
841 | have_to_wait = 1; | |
842 | continue; | |
843 | } | |
844 | ||
674a396c | 845 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 846 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 847 | |
12003375 | 848 | down(&w1_mlock); |
6adf87bd | 849 | list_del(&dev->w1_master_entry); |
12003375 | 850 | up(&w1_mlock); |
6adf87bd | 851 | |
3aca692d | 852 | down(&dev->mutex); |
6adf87bd | 853 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 854 | w1_slave_detach(sl); |
6adf87bd EP |
855 | } |
856 | w1_destroy_master_attributes(dev); | |
3aca692d | 857 | up(&dev->mutex); |
6adf87bd EP |
858 | atomic_dec(&dev->refcnt); |
859 | continue; | |
860 | } | |
861 | ||
862 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 863 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
6adf87bd | 864 | down(&dev->mutex); |
3aca692d | 865 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
866 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
867 | struct w1_reg_num rn; | |
6adf87bd EP |
868 | |
869 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 870 | w1_slave_detach(sl); |
1da177e4 | 871 | |
6adf87bd EP |
872 | w1_attach_slave_device(dev, &rn); |
873 | } | |
874 | } | |
7c8f5703 | 875 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd EP |
876 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
877 | up(&dev->mutex); | |
1da177e4 | 878 | } |
1da177e4 LT |
879 | } |
880 | } | |
881 | ||
674a396c | 882 | return 0; |
1da177e4 LT |
883 | } |
884 | ||
12003375 EP |
885 | void w1_search_process(struct w1_master *dev, u8 search_type) |
886 | { | |
887 | struct w1_slave *sl, *sln; | |
888 | ||
889 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
890 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
891 | ||
892 | w1_search_devices(dev, search_type, w1_slave_found); | |
893 | ||
894 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
895 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
896 | w1_slave_detach(sl); | |
897 | ||
898 | dev->slave_count--; | |
899 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) | |
900 | sl->ttl = dev->slave_ttl; | |
901 | } | |
902 | ||
903 | if (dev->search_count > 0) | |
904 | dev->search_count--; | |
905 | } | |
906 | ||
1da177e4 LT |
907 | int w1_process(void *data) |
908 | { | |
909 | struct w1_master *dev = (struct w1_master *) data; | |
1da177e4 | 910 | |
674a396c | 911 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 912 | try_to_freeze(); |
1da177e4 LT |
913 | msleep_interruptible(w1_timeout * 1000); |
914 | ||
674a396c | 915 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
916 | break; |
917 | ||
918 | if (!dev->initialized) | |
919 | continue; | |
920 | ||
2a9d0c17 EP |
921 | if (dev->search_count == 0) |
922 | continue; | |
923 | ||
1da177e4 LT |
924 | if (down_interruptible(&dev->mutex)) |
925 | continue; | |
926 | ||
12003375 | 927 | w1_search_process(dev, W1_SEARCH); |
2a9d0c17 | 928 | |
1da177e4 LT |
929 | up(&dev->mutex); |
930 | } | |
931 | ||
932 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
933 | |
934 | return 0; | |
935 | } | |
936 | ||
7785925d | 937 | static int w1_init(void) |
1da177e4 LT |
938 | { |
939 | int retval; | |
940 | ||
941 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
942 | ||
12003375 EP |
943 | w1_init_netlink(); |
944 | ||
1da177e4 LT |
945 | retval = bus_register(&w1_bus_type); |
946 | if (retval) { | |
947 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
948 | goto err_out_exit_init; | |
949 | } | |
950 | ||
7f772ed8 | 951 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
952 | if (retval) { |
953 | printk(KERN_ERR | |
954 | "Failed to register master driver. err=%d.\n", | |
955 | retval); | |
956 | goto err_out_bus_unregister; | |
957 | } | |
958 | ||
7f772ed8 EP |
959 | retval = driver_register(&w1_slave_driver); |
960 | if (retval) { | |
961 | printk(KERN_ERR | |
962 | "Failed to register master driver. err=%d.\n", | |
963 | retval); | |
964 | goto err_out_master_unregister; | |
965 | } | |
966 | ||
674a396c EP |
967 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
968 | if (IS_ERR(w1_control_thread)) { | |
969 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 970 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 971 | retval); |
7f772ed8 | 972 | goto err_out_slave_unregister; |
1da177e4 LT |
973 | } |
974 | ||
975 | return 0; | |
976 | ||
7f772ed8 EP |
977 | err_out_slave_unregister: |
978 | driver_unregister(&w1_slave_driver); | |
979 | ||
980 | err_out_master_unregister: | |
981 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
982 | |
983 | err_out_bus_unregister: | |
984 | bus_unregister(&w1_bus_type); | |
985 | ||
986 | err_out_exit_init: | |
987 | return retval; | |
988 | } | |
989 | ||
7785925d | 990 | static void w1_fini(void) |
1da177e4 LT |
991 | { |
992 | struct w1_master *dev; | |
1da177e4 | 993 | |
7785925d | 994 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 995 | __w1_remove_master_device(dev); |
1da177e4 | 996 | |
12003375 EP |
997 | w1_fini_netlink(); |
998 | ||
674a396c | 999 | kthread_stop(w1_control_thread); |
1da177e4 | 1000 | |
7f772ed8 EP |
1001 | driver_unregister(&w1_slave_driver); |
1002 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
1003 | bus_unregister(&w1_bus_type); |
1004 | } | |
1005 | ||
1006 | module_init(w1_init); | |
1007 | module_exit(w1_fini); |