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 | 141 | /* Default family */ |
f522d239 EP |
142 | |
143 | static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
144 | { | |
145 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
146 | ||
147 | if (down_interruptible(&sl->master->mutex)) { | |
148 | count = 0; | |
149 | goto out; | |
150 | } | |
151 | ||
152 | if (w1_reset_select_slave(sl)) { | |
153 | count = 0; | |
154 | goto out_up; | |
155 | } | |
156 | ||
157 | w1_write_block(sl->master, buf, count); | |
158 | ||
159 | out_up: | |
160 | up(&sl->master->mutex); | |
161 | out: | |
162 | return count; | |
163 | } | |
164 | ||
165 | static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
166 | { | |
167 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
168 | ||
169 | if (down_interruptible(&sl->master->mutex)) { | |
170 | count = 0; | |
171 | goto out; | |
172 | } | |
173 | ||
174 | w1_read_block(sl->master, buf, count); | |
175 | ||
176 | up(&sl->master->mutex); | |
177 | out: | |
178 | return count; | |
179 | } | |
180 | ||
181 | static struct bin_attribute w1_default_attr = { | |
182 | .attr = { | |
183 | .name = "rw", | |
184 | .mode = S_IRUGO | S_IWUSR, | |
185 | .owner = THIS_MODULE, | |
186 | }, | |
187 | .size = PAGE_SIZE, | |
188 | .read = w1_default_read, | |
189 | .write = w1_default_write, | |
190 | }; | |
191 | ||
192 | static int w1_default_add_slave(struct w1_slave *sl) | |
193 | { | |
194 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
195 | } | |
196 | ||
197 | static void w1_default_remove_slave(struct w1_slave *sl) | |
198 | { | |
199 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
200 | } | |
201 | ||
202 | static struct w1_family_ops w1_default_fops = { | |
203 | .add_slave = w1_default_add_slave, | |
204 | .remove_slave = w1_default_remove_slave, | |
205 | }; | |
206 | ||
207 | static struct w1_family w1_default_family = { | |
208 | .fops = &w1_default_fops, | |
209 | }; | |
d2a4ef6a | 210 | |
312c004d | 211 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 212 | |
1da177e4 LT |
213 | static struct bus_type w1_bus_type = { |
214 | .name = "w1", | |
215 | .match = w1_master_match, | |
312c004d | 216 | .uevent = w1_uevent, |
1da177e4 LT |
217 | }; |
218 | ||
7f772ed8 EP |
219 | struct device_driver w1_master_driver = { |
220 | .name = "w1_master_driver", | |
1da177e4 LT |
221 | .bus = &w1_bus_type, |
222 | .probe = w1_master_probe, | |
1da177e4 LT |
223 | }; |
224 | ||
7f772ed8 | 225 | struct device w1_master_device = { |
1da177e4 LT |
226 | .parent = NULL, |
227 | .bus = &w1_bus_type, | |
228 | .bus_id = "w1 bus master", | |
7f772ed8 | 229 | .driver = &w1_master_driver, |
1da177e4 LT |
230 | .release = &w1_master_release |
231 | }; | |
232 | ||
a9fb1c7b | 233 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
234 | .name = "w1_slave_driver", |
235 | .bus = &w1_bus_type, | |
236 | }; | |
237 | ||
a9fb1c7b | 238 | #if 0 |
7f772ed8 EP |
239 | struct device w1_slave_device = { |
240 | .parent = NULL, | |
241 | .bus = &w1_bus_type, | |
242 | .bus_id = "w1 bus slave", | |
243 | .driver = &w1_slave_driver, | |
3aca692d | 244 | .release = &w1_slave_release |
7f772ed8 | 245 | }; |
a9fb1c7b | 246 | #endif /* 0 */ |
7f772ed8 | 247 | |
060b8845 | 248 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 249 | { |
db2d0008 | 250 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 251 | ssize_t count; |
7785925d | 252 | |
1da177e4 LT |
253 | if (down_interruptible (&md->mutex)) |
254 | return -EBUSY; | |
255 | ||
256 | count = sprintf(buf, "%s\n", md->name); | |
7785925d | 257 | |
1da177e4 LT |
258 | up(&md->mutex); |
259 | ||
260 | return count; | |
261 | } | |
262 | ||
2a9d0c17 EP |
263 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
264 | struct device_attribute *attr, | |
265 | const char * buf, size_t count) | |
266 | { | |
db2d0008 | 267 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
268 | |
269 | if (down_interruptible (&md->mutex)) | |
270 | return -EBUSY; | |
271 | ||
272 | md->search_count = simple_strtol(buf, NULL, 0); | |
273 | ||
274 | up(&md->mutex); | |
275 | ||
276 | return count; | |
277 | } | |
278 | ||
279 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
280 | struct device_attribute *attr, | |
281 | char *buf) | |
282 | { | |
db2d0008 | 283 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
284 | ssize_t count; |
285 | ||
286 | if (down_interruptible (&md->mutex)) | |
287 | return -EBUSY; | |
288 | ||
289 | count = sprintf(buf, "%d\n", md->search_count); | |
290 | ||
291 | up(&md->mutex); | |
292 | ||
293 | return count; | |
294 | } | |
295 | ||
060b8845 | 296 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 297 | { |
db2d0008 | 298 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 299 | ssize_t count; |
7785925d | 300 | |
1da177e4 LT |
301 | if (down_interruptible(&md->mutex)) |
302 | return -EBUSY; | |
303 | ||
304 | count = sprintf(buf, "0x%p\n", md->bus_master); | |
7785925d | 305 | |
1da177e4 LT |
306 | up(&md->mutex); |
307 | return count; | |
308 | } | |
309 | ||
060b8845 | 310 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
311 | { |
312 | ssize_t count; | |
313 | count = sprintf(buf, "%d\n", w1_timeout); | |
314 | return count; | |
315 | } | |
316 | ||
060b8845 | 317 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 318 | { |
db2d0008 | 319 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 320 | ssize_t count; |
7785925d | 321 | |
1da177e4 LT |
322 | if (down_interruptible(&md->mutex)) |
323 | return -EBUSY; | |
324 | ||
325 | count = sprintf(buf, "%d\n", md->max_slave_count); | |
7785925d | 326 | |
1da177e4 LT |
327 | up(&md->mutex); |
328 | return count; | |
329 | } | |
330 | ||
060b8845 | 331 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 332 | { |
db2d0008 | 333 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 334 | ssize_t count; |
7785925d | 335 | |
1da177e4 LT |
336 | if (down_interruptible(&md->mutex)) |
337 | return -EBUSY; | |
338 | ||
339 | count = sprintf(buf, "%lu\n", md->attempts); | |
7785925d | 340 | |
1da177e4 LT |
341 | up(&md->mutex); |
342 | return count; | |
343 | } | |
344 | ||
060b8845 | 345 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 346 | { |
db2d0008 | 347 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 348 | ssize_t count; |
7785925d | 349 | |
1da177e4 LT |
350 | if (down_interruptible(&md->mutex)) |
351 | return -EBUSY; | |
352 | ||
353 | count = sprintf(buf, "%d\n", md->slave_count); | |
7785925d | 354 | |
1da177e4 LT |
355 | up(&md->mutex); |
356 | return count; | |
357 | } | |
358 | ||
060b8845 | 359 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 360 | { |
db2d0008 | 361 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
362 | int c = PAGE_SIZE; |
363 | ||
364 | if (down_interruptible(&md->mutex)) | |
365 | return -EBUSY; | |
366 | ||
367 | if (md->slave_count == 0) | |
368 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
369 | else { | |
370 | struct list_head *ent, *n; | |
371 | struct w1_slave *sl; | |
372 | ||
373 | list_for_each_safe(ent, n, &md->slist) { | |
374 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
375 | ||
7785925d | 376 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
377 | } |
378 | } | |
379 | ||
380 | up(&md->mutex); | |
381 | ||
382 | return PAGE_SIZE - c; | |
383 | } | |
384 | ||
7785925d EP |
385 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
386 | struct device_attribute w1_master_attribute_##_name = \ | |
387 | __ATTR(w1_master_##_name, _mode, \ | |
388 | w1_master_attribute_show_##_name, NULL) | |
389 | ||
2a9d0c17 EP |
390 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
391 | struct device_attribute w1_master_attribute_##_name = \ | |
392 | __ATTR(w1_master_##_name, _mode, \ | |
393 | w1_master_attribute_show_##_name, \ | |
394 | w1_master_attribute_store_##_name) | |
395 | ||
7785925d EP |
396 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
397 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
398 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
399 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
400 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
401 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
402 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 403 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
404 | |
405 | static struct attribute *w1_master_default_attrs[] = { | |
406 | &w1_master_attribute_name.attr, | |
407 | &w1_master_attribute_slaves.attr, | |
408 | &w1_master_attribute_slave_count.attr, | |
409 | &w1_master_attribute_max_slave_count.attr, | |
410 | &w1_master_attribute_attempts.attr, | |
411 | &w1_master_attribute_timeout.attr, | |
412 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 413 | &w1_master_attribute_search.attr, |
7785925d | 414 | NULL |
1da177e4 LT |
415 | }; |
416 | ||
7785925d EP |
417 | static struct attribute_group w1_master_defattr_group = { |
418 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
419 | }; |
420 | ||
7785925d EP |
421 | int w1_create_master_attributes(struct w1_master *master) |
422 | { | |
423 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
424 | } | |
425 | ||
a9fb1c7b | 426 | static void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
427 | { |
428 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
429 | } | |
430 | ||
7f772ed8 | 431 | #ifdef CONFIG_HOTPLUG |
312c004d | 432 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
433 | { |
434 | struct w1_master *md = NULL; | |
435 | struct w1_slave *sl = NULL; | |
436 | char *event_owner, *name; | |
437 | int err, cur_index=0, cur_len=0; | |
438 | ||
439 | if (dev->driver == &w1_master_driver) { | |
440 | md = container_of(dev, struct w1_master, dev); | |
441 | event_owner = "master"; | |
442 | name = md->name; | |
443 | } else if (dev->driver == &w1_slave_driver) { | |
444 | sl = container_of(dev, struct w1_slave, dev); | |
445 | event_owner = "slave"; | |
446 | name = sl->name; | |
447 | } else { | |
312c004d | 448 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
449 | return -EINVAL; |
450 | } | |
451 | ||
452 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id); | |
453 | ||
454 | if (dev->driver != &w1_slave_driver || !sl) | |
455 | return 0; | |
456 | ||
f73b5e79 AM |
457 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
458 | &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
7f772ed8 EP |
459 | if (err) |
460 | return err; | |
461 | ||
f73b5e79 AM |
462 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
463 | &cur_len, "W1_SLAVE_ID=%024LX", | |
464 | (unsigned long long)sl->reg_num.id); | |
7f772ed8 EP |
465 | if (err) |
466 | return err; | |
467 | ||
468 | return 0; | |
469 | }; | |
470 | #else | |
312c004d | 471 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
7f772ed8 EP |
472 | { |
473 | return 0; | |
474 | } | |
475 | #endif | |
476 | ||
1da177e4 LT |
477 | static int __w1_attach_slave_device(struct w1_slave *sl) |
478 | { | |
479 | int err; | |
480 | ||
481 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 482 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
483 | sl->dev.bus = &w1_bus_type; |
484 | sl->dev.release = &w1_slave_release; | |
485 | ||
486 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
487 | "%02x-%012llx", |
488 | (unsigned int) sl->reg_num.family, | |
489 | (unsigned long long) sl->reg_num.id); | |
490 | snprintf(&sl->name[0], sizeof(sl->name), | |
491 | "%02x-%012llx", | |
492 | (unsigned int) sl->reg_num.family, | |
493 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 494 | |
3aca692d | 495 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); |
1da177e4 LT |
496 | |
497 | err = device_register(&sl->dev); | |
498 | if (err < 0) { | |
499 | dev_err(&sl->dev, | |
6b729861 EP |
500 | "Device registration [%s] failed. err=%d\n", |
501 | sl->dev.bus_id, err); | |
1da177e4 LT |
502 | return err; |
503 | } | |
504 | ||
d2a4ef6a EP |
505 | /* Create "name" entry */ |
506 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
507 | if (err < 0) { | |
508 | dev_err(&sl->dev, | |
509 | "sysfs file creation for [%s] failed. err=%d\n", | |
510 | sl->dev.bus_id, err); | |
511 | goto out_unreg; | |
512 | } | |
1da177e4 | 513 | |
d2a4ef6a EP |
514 | /* Create "id" entry */ |
515 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
516 | if (err < 0) { |
517 | dev_err(&sl->dev, | |
6b729861 EP |
518 | "sysfs file creation for [%s] failed. err=%d\n", |
519 | sl->dev.bus_id, err); | |
d2a4ef6a | 520 | goto out_rem1; |
1da177e4 LT |
521 | } |
522 | ||
d2a4ef6a EP |
523 | /* if the family driver needs to initialize something... */ |
524 | if (sl->family->fops && sl->family->fops->add_slave && | |
525 | ((err = sl->family->fops->add_slave(sl)) < 0)) { | |
526 | dev_err(&sl->dev, | |
527 | "sysfs file creation for [%s] failed. err=%d\n", | |
528 | sl->dev.bus_id, err); | |
529 | goto out_rem2; | |
1da177e4 LT |
530 | } |
531 | ||
532 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
533 | ||
534 | return 0; | |
d2a4ef6a EP |
535 | |
536 | out_rem2: | |
537 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
538 | out_rem1: | |
539 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
540 | out_unreg: | |
541 | device_unregister(&sl->dev); | |
542 | return err; | |
1da177e4 LT |
543 | } |
544 | ||
545 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
546 | { | |
547 | struct w1_slave *sl; | |
548 | struct w1_family *f; | |
549 | int err; | |
550 | struct w1_netlink_msg msg; | |
551 | ||
552 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
553 | if (!sl) { | |
554 | dev_err(&dev->dev, | |
555 | "%s: failed to allocate new slave device.\n", | |
556 | __func__); | |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | memset(sl, 0, sizeof(*sl)); | |
561 | ||
562 | sl->owner = THIS_MODULE; | |
563 | sl->master = dev; | |
564 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
565 | ||
566 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); | |
567 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 568 | init_completion(&sl->released); |
1da177e4 LT |
569 | |
570 | spin_lock(&w1_flock); | |
571 | f = w1_family_registered(rn->family); | |
572 | if (!f) { | |
99c5bfe9 | 573 | f= &w1_default_family; |
1da177e4 LT |
574 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
575 | rn->family, rn->family, | |
576 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
577 | } |
578 | __w1_family_get(f); | |
579 | spin_unlock(&w1_flock); | |
580 | ||
581 | sl->family = f; | |
582 | ||
583 | ||
584 | err = __w1_attach_slave_device(sl); | |
585 | if (err < 0) { | |
586 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
587 | sl->name); | |
588 | w1_family_put(sl->family); | |
589 | kfree(sl); | |
590 | return err; | |
591 | } | |
592 | ||
593 | sl->ttl = dev->slave_ttl; | |
594 | dev->slave_count++; | |
595 | ||
596 | memcpy(&msg.id.id, rn, sizeof(msg.id.id)); | |
597 | msg.type = W1_SLAVE_ADD; | |
598 | w1_netlink_send(dev, &msg); | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
603 | static void w1_slave_detach(struct w1_slave *sl) | |
604 | { | |
605 | struct w1_netlink_msg msg; | |
7785925d | 606 | |
7c8f5703 | 607 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 608 | |
3aca692d | 609 | list_del(&sl->w1_slave_entry); |
1da177e4 | 610 | |
d2a4ef6a EP |
611 | if (sl->family->fops && sl->family->fops->remove_slave) |
612 | sl->family->fops->remove_slave(sl); | |
613 | ||
3aca692d EP |
614 | memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); |
615 | msg.type = W1_SLAVE_REMOVE; | |
616 | w1_netlink_send(sl->master, &msg); | |
617 | ||
d2a4ef6a EP |
618 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
619 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 620 | device_unregister(&sl->dev); |
1da177e4 | 621 | |
3aca692d EP |
622 | wait_for_completion(&sl->released); |
623 | kfree(sl); | |
1da177e4 LT |
624 | } |
625 | ||
ccd69940 | 626 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
627 | { |
628 | struct w1_master *dev; | |
629 | int found = 0; | |
7785925d EP |
630 | |
631 | spin_lock_bh(&w1_mlock); | |
1da177e4 LT |
632 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
633 | if (dev->bus_master->data == data) { | |
634 | found = 1; | |
635 | atomic_inc(&dev->refcnt); | |
636 | break; | |
637 | } | |
638 | } | |
7785925d | 639 | spin_unlock_bh(&w1_mlock); |
1da177e4 LT |
640 | |
641 | return (found)?dev:NULL; | |
642 | } | |
643 | ||
6adf87bd EP |
644 | void w1_reconnect_slaves(struct w1_family *f) |
645 | { | |
646 | struct w1_master *dev; | |
647 | ||
648 | spin_lock_bh(&w1_mlock); | |
649 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
7c8f5703 | 650 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
651 | dev->name, f->fid); |
652 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
653 | } | |
654 | spin_unlock_bh(&w1_mlock); | |
655 | } | |
656 | ||
ccd69940 | 657 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
658 | { |
659 | int slave_count; | |
660 | struct w1_slave *sl; | |
661 | struct list_head *ent; | |
662 | struct w1_reg_num *tmp; | |
663 | int family_found = 0; | |
664 | struct w1_master *dev; | |
0e65f828 | 665 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
666 | |
667 | dev = w1_search_master(data); | |
668 | if (!dev) { | |
ccd69940 EP |
669 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
670 | "it is impossible.\n", data); | |
1da177e4 LT |
671 | return; |
672 | } | |
7785925d | 673 | |
1da177e4 LT |
674 | tmp = (struct w1_reg_num *) &rn; |
675 | ||
676 | slave_count = 0; | |
677 | list_for_each(ent, &dev->slist) { | |
678 | ||
679 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
680 | ||
681 | if (sl->reg_num.family == tmp->family && | |
682 | sl->reg_num.id == tmp->id && | |
683 | sl->reg_num.crc == tmp->crc) { | |
684 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
685 | break; | |
7785925d | 686 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
687 | family_found = 1; |
688 | break; | |
689 | } | |
690 | ||
691 | slave_count++; | |
692 | } | |
693 | ||
8523ff45 | 694 | if (slave_count == dev->slave_count && |
0e65f828 | 695 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 696 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 697 | } |
7785925d | 698 | |
1da177e4 LT |
699 | atomic_dec(&dev->refcnt); |
700 | } | |
701 | ||
6b729861 EP |
702 | /** |
703 | * Performs a ROM Search & registers any devices found. | |
704 | * The 1-wire search is a simple binary tree search. | |
705 | * For each bit of the address, we read two bits and write one bit. | |
706 | * The bit written will put to sleep all devies that don't match that bit. | |
707 | * When the two reads differ, the direction choice is obvious. | |
708 | * When both bits are 0, we must choose a path to take. | |
709 | * When we can scan all 64 bits without having to choose a path, we are done. | |
710 | * | |
711 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
712 | * | |
713 | * @dev The master device to search | |
714 | * @cb Function to call when a device is found | |
715 | */ | |
716 | void w1_search(struct w1_master *dev, w1_slave_found_callback cb) | |
1da177e4 | 717 | { |
6b729861 EP |
718 | u64 last_rn, rn, tmp64; |
719 | int i, slave_count = 0; | |
720 | int last_zero, last_device; | |
721 | int search_bit, desc_bit; | |
722 | u8 triplet_ret = 0; | |
1da177e4 | 723 | |
6b729861 EP |
724 | search_bit = 0; |
725 | rn = last_rn = 0; | |
726 | last_device = 0; | |
727 | last_zero = -1; | |
1da177e4 LT |
728 | |
729 | desc_bit = 64; | |
730 | ||
6b729861 EP |
731 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
732 | last_rn = rn; | |
1da177e4 LT |
733 | rn = 0; |
734 | ||
1da177e4 LT |
735 | /* |
736 | * Reset bus and all 1-wire device state machines | |
737 | * so they can respond to our requests. | |
738 | * | |
739 | * Return 0 - device(s) present, 1 - no devices present. | |
740 | */ | |
741 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 742 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
743 | break; |
744 | } | |
745 | ||
6b729861 | 746 | /* Start the search */ |
1da177e4 LT |
747 | w1_write_8(dev, W1_SEARCH); |
748 | for (i = 0; i < 64; ++i) { | |
6b729861 EP |
749 | /* Determine the direction/search bit */ |
750 | if (i == desc_bit) | |
751 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
752 | else if (i > desc_bit) | |
753 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 754 | else |
6b729861 | 755 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 756 | |
6b729861 EP |
757 | /** Read two bits and write one bit */ |
758 | triplet_ret = w1_triplet(dev, search_bit); | |
759 | ||
760 | /* quit if no device responded */ | |
761 | if ( (triplet_ret & 0x03) == 0x03 ) | |
762 | break; | |
1da177e4 | 763 | |
6b729861 EP |
764 | /* If both directions were valid, and we took the 0 path... */ |
765 | if (triplet_ret == 0) | |
766 | last_zero = i; | |
1da177e4 | 767 | |
6b729861 EP |
768 | /* extract the direction taken & update the device number */ |
769 | tmp64 = (triplet_ret >> 2); | |
770 | rn |= (tmp64 << i); | |
771 | } | |
7785925d | 772 | |
6b729861 EP |
773 | if ( (triplet_ret & 0x03) != 0x03 ) { |
774 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
775 | last_device = 1; | |
776 | desc_bit = last_zero; | |
777 | cb(dev->bus_master->data, rn); | |
778 | } | |
1da177e4 LT |
779 | } |
780 | } | |
781 | ||
7785925d | 782 | static int w1_control(void *data) |
1da177e4 | 783 | { |
7785925d EP |
784 | struct w1_slave *sl, *sln; |
785 | struct w1_master *dev, *n; | |
674a396c | 786 | int have_to_wait = 0; |
1da177e4 | 787 | |
674a396c | 788 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
789 | have_to_wait = 0; |
790 | ||
3e1d1d28 | 791 | try_to_freeze(); |
3aca692d | 792 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 793 | |
7785925d | 794 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 795 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
796 | continue; |
797 | /* | |
798 | * Little race: we can create thread but not set the flag. | |
799 | * Get a chance for external process to set flag up. | |
800 | */ | |
801 | if (!dev->initialized) { | |
802 | have_to_wait = 1; | |
803 | continue; | |
804 | } | |
805 | ||
674a396c | 806 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 807 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 808 | |
674a396c | 809 | spin_lock(&w1_mlock); |
6adf87bd | 810 | list_del(&dev->w1_master_entry); |
674a396c | 811 | spin_unlock(&w1_mlock); |
6adf87bd | 812 | |
3aca692d | 813 | down(&dev->mutex); |
6adf87bd | 814 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 815 | w1_slave_detach(sl); |
6adf87bd EP |
816 | } |
817 | w1_destroy_master_attributes(dev); | |
3aca692d | 818 | up(&dev->mutex); |
6adf87bd EP |
819 | atomic_dec(&dev->refcnt); |
820 | continue; | |
821 | } | |
822 | ||
823 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 824 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
6adf87bd | 825 | down(&dev->mutex); |
3aca692d | 826 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
827 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
828 | struct w1_reg_num rn; | |
6adf87bd EP |
829 | |
830 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 831 | w1_slave_detach(sl); |
1da177e4 | 832 | |
6adf87bd EP |
833 | w1_attach_slave_device(dev, &rn); |
834 | } | |
835 | } | |
7c8f5703 | 836 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd EP |
837 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
838 | up(&dev->mutex); | |
1da177e4 | 839 | } |
1da177e4 LT |
840 | } |
841 | } | |
842 | ||
674a396c | 843 | return 0; |
1da177e4 LT |
844 | } |
845 | ||
846 | int w1_process(void *data) | |
847 | { | |
848 | struct w1_master *dev = (struct w1_master *) data; | |
7785925d | 849 | struct w1_slave *sl, *sln; |
1da177e4 | 850 | |
674a396c | 851 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 852 | try_to_freeze(); |
1da177e4 LT |
853 | msleep_interruptible(w1_timeout * 1000); |
854 | ||
674a396c | 855 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
856 | break; |
857 | ||
858 | if (!dev->initialized) | |
859 | continue; | |
860 | ||
2a9d0c17 EP |
861 | if (dev->search_count == 0) |
862 | continue; | |
863 | ||
1da177e4 LT |
864 | if (down_interruptible(&dev->mutex)) |
865 | continue; | |
866 | ||
7785925d | 867 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
2a9d0c17 | 868 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
1da177e4 | 869 | |
7785925d | 870 | w1_search_devices(dev, w1_slave_found); |
1da177e4 | 871 | |
7785925d EP |
872 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
873 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
d2a4ef6a | 874 | w1_slave_detach(sl); |
1da177e4 LT |
875 | |
876 | dev->slave_count--; | |
7785925d | 877 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
1da177e4 LT |
878 | sl->ttl = dev->slave_ttl; |
879 | } | |
2a9d0c17 EP |
880 | |
881 | if (dev->search_count > 0) | |
882 | dev->search_count--; | |
883 | ||
1da177e4 LT |
884 | up(&dev->mutex); |
885 | } | |
886 | ||
887 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
888 | |
889 | return 0; | |
890 | } | |
891 | ||
7785925d | 892 | static int w1_init(void) |
1da177e4 LT |
893 | { |
894 | int retval; | |
895 | ||
896 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
897 | ||
898 | retval = bus_register(&w1_bus_type); | |
899 | if (retval) { | |
900 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
901 | goto err_out_exit_init; | |
902 | } | |
903 | ||
7f772ed8 | 904 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
905 | if (retval) { |
906 | printk(KERN_ERR | |
907 | "Failed to register master driver. err=%d.\n", | |
908 | retval); | |
909 | goto err_out_bus_unregister; | |
910 | } | |
911 | ||
7f772ed8 EP |
912 | retval = driver_register(&w1_slave_driver); |
913 | if (retval) { | |
914 | printk(KERN_ERR | |
915 | "Failed to register master driver. err=%d.\n", | |
916 | retval); | |
917 | goto err_out_master_unregister; | |
918 | } | |
919 | ||
674a396c EP |
920 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
921 | if (IS_ERR(w1_control_thread)) { | |
922 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 923 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 924 | retval); |
7f772ed8 | 925 | goto err_out_slave_unregister; |
1da177e4 LT |
926 | } |
927 | ||
928 | return 0; | |
929 | ||
7f772ed8 EP |
930 | err_out_slave_unregister: |
931 | driver_unregister(&w1_slave_driver); | |
932 | ||
933 | err_out_master_unregister: | |
934 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
935 | |
936 | err_out_bus_unregister: | |
937 | bus_unregister(&w1_bus_type); | |
938 | ||
939 | err_out_exit_init: | |
940 | return retval; | |
941 | } | |
942 | ||
7785925d | 943 | static void w1_fini(void) |
1da177e4 LT |
944 | { |
945 | struct w1_master *dev; | |
1da177e4 | 946 | |
7785925d | 947 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 948 | __w1_remove_master_device(dev); |
1da177e4 | 949 | |
674a396c | 950 | kthread_stop(w1_control_thread); |
1da177e4 | 951 | |
7f772ed8 EP |
952 | driver_unregister(&w1_slave_driver); |
953 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
954 | bus_unregister(&w1_bus_type); |
955 | } | |
956 | ||
957 | module_init(w1_init); | |
958 | module_exit(w1_fini); |