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> |
7dfb7103 | 34 | #include <linux/freezer.h> |
1da177e4 LT |
35 | |
36 | #include <asm/atomic.h> | |
37 | ||
38 | #include "w1.h" | |
1da177e4 LT |
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 | ||
abd52a13 | 58 | DEFINE_MUTEX(w1_mlock); |
1da177e4 LT |
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); | |
3aca692d EP |
78 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
79 | kfree(md); | |
1da177e4 LT |
80 | } |
81 | ||
82 | static void w1_slave_release(struct device *dev) | |
83 | { | |
db2d0008 | 84 | struct w1_slave *sl = dev_to_w1_slave(dev); |
3aca692d | 85 | |
12003375 | 86 | printk("%s: Releasing %s.\n", __func__, sl->name); |
3aca692d EP |
87 | |
88 | while (atomic_read(&sl->refcnt)) { | |
12003375 | 89 | printk("Waiting for %s to become free: refcnt=%d.\n", |
3aca692d EP |
90 | sl->name, atomic_read(&sl->refcnt)); |
91 | if (msleep_interruptible(1000)) | |
92 | flush_signals(current); | |
93 | } | |
94 | ||
95 | w1_family_put(sl->family); | |
96 | sl->master->slave_count--; | |
97 | ||
98 | complete(&sl->released); | |
1da177e4 LT |
99 | } |
100 | ||
d2a4ef6a | 101 | static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 102 | { |
3aca692d | 103 | struct w1_slave *sl = dev_to_w1_slave(dev); |
d2a4ef6a | 104 | |
3aca692d | 105 | return sprintf(buf, "%s\n", sl->name); |
1da177e4 LT |
106 | } |
107 | ||
91a69029 ZR |
108 | static ssize_t w1_slave_read_id(struct kobject *kobj, |
109 | struct bin_attribute *bin_attr, | |
110 | 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 | if (off > 8) { |
115 | count = 0; | |
d2a4ef6a EP |
116 | } else { |
117 | if (off + count > 8) | |
118 | count = 8 - off; | |
119 | ||
120 | memcpy(buf, (u8 *)&sl->reg_num, count); | |
121 | } | |
d2a4ef6a EP |
122 | |
123 | return count; | |
3aca692d | 124 | } |
d2a4ef6a EP |
125 | |
126 | static struct device_attribute w1_slave_attr_name = | |
127 | __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); | |
128 | ||
129 | static struct bin_attribute w1_slave_attr_bin_id = { | |
130 | .attr = { | |
131 | .name = "id", | |
132 | .mode = S_IRUGO, | |
d2a4ef6a EP |
133 | }, |
134 | .size = 8, | |
135 | .read = w1_slave_read_id, | |
7785925d EP |
136 | }; |
137 | ||
d2a4ef6a | 138 | /* Default family */ |
f522d239 | 139 | |
91a69029 ZR |
140 | static ssize_t w1_default_write(struct kobject *kobj, |
141 | struct bin_attribute *bin_attr, | |
142 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
143 | { |
144 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
145 | ||
abd52a13 | 146 | mutex_lock(&sl->master->mutex); |
f522d239 EP |
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: | |
abd52a13 | 155 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
156 | return count; |
157 | } | |
158 | ||
91a69029 ZR |
159 | static ssize_t w1_default_read(struct kobject *kobj, |
160 | struct bin_attribute *bin_attr, | |
161 | char *buf, loff_t off, size_t count) | |
f522d239 EP |
162 | { |
163 | struct w1_slave *sl = kobj_to_w1_slave(kobj); | |
164 | ||
abd52a13 | 165 | mutex_lock(&sl->master->mutex); |
f522d239 | 166 | w1_read_block(sl->master, buf, count); |
abd52a13 | 167 | mutex_unlock(&sl->master->mutex); |
f522d239 EP |
168 | return count; |
169 | } | |
170 | ||
171 | static struct bin_attribute w1_default_attr = { | |
172 | .attr = { | |
173 | .name = "rw", | |
174 | .mode = S_IRUGO | S_IWUSR, | |
f522d239 EP |
175 | }, |
176 | .size = PAGE_SIZE, | |
177 | .read = w1_default_read, | |
178 | .write = w1_default_write, | |
179 | }; | |
180 | ||
181 | static int w1_default_add_slave(struct w1_slave *sl) | |
182 | { | |
183 | return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); | |
184 | } | |
185 | ||
186 | static void w1_default_remove_slave(struct w1_slave *sl) | |
187 | { | |
188 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); | |
189 | } | |
190 | ||
191 | static struct w1_family_ops w1_default_fops = { | |
192 | .add_slave = w1_default_add_slave, | |
193 | .remove_slave = w1_default_remove_slave, | |
194 | }; | |
195 | ||
196 | static struct w1_family w1_default_family = { | |
197 | .fops = &w1_default_fops, | |
198 | }; | |
d2a4ef6a | 199 | |
312c004d | 200 | static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); |
7785925d | 201 | |
1da177e4 LT |
202 | static struct bus_type w1_bus_type = { |
203 | .name = "w1", | |
204 | .match = w1_master_match, | |
312c004d | 205 | .uevent = w1_uevent, |
1da177e4 LT |
206 | }; |
207 | ||
7f772ed8 EP |
208 | struct device_driver w1_master_driver = { |
209 | .name = "w1_master_driver", | |
1da177e4 LT |
210 | .bus = &w1_bus_type, |
211 | .probe = w1_master_probe, | |
1da177e4 LT |
212 | }; |
213 | ||
7f772ed8 | 214 | struct device w1_master_device = { |
1da177e4 LT |
215 | .parent = NULL, |
216 | .bus = &w1_bus_type, | |
217 | .bus_id = "w1 bus master", | |
7f772ed8 | 218 | .driver = &w1_master_driver, |
1da177e4 LT |
219 | .release = &w1_master_release |
220 | }; | |
221 | ||
2c5bfdac | 222 | static struct device_driver w1_slave_driver = { |
7f772ed8 EP |
223 | .name = "w1_slave_driver", |
224 | .bus = &w1_bus_type, | |
225 | }; | |
226 | ||
2c5bfdac | 227 | #if 0 |
7f772ed8 EP |
228 | struct device w1_slave_device = { |
229 | .parent = NULL, | |
230 | .bus = &w1_bus_type, | |
231 | .bus_id = "w1 bus slave", | |
232 | .driver = &w1_slave_driver, | |
3aca692d | 233 | .release = &w1_slave_release |
7f772ed8 | 234 | }; |
2c5bfdac | 235 | #endif /* 0 */ |
7f772ed8 | 236 | |
060b8845 | 237 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 238 | { |
db2d0008 | 239 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 240 | ssize_t count; |
7785925d | 241 | |
abd52a13 | 242 | mutex_lock(&md->mutex); |
1da177e4 | 243 | count = sprintf(buf, "%s\n", md->name); |
abd52a13 | 244 | mutex_unlock(&md->mutex); |
1da177e4 LT |
245 | |
246 | return count; | |
247 | } | |
248 | ||
2a9d0c17 EP |
249 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
250 | struct device_attribute *attr, | |
251 | const char * buf, size_t count) | |
252 | { | |
db2d0008 | 253 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 | 254 | |
abd52a13 | 255 | mutex_lock(&md->mutex); |
2a9d0c17 | 256 | md->search_count = simple_strtol(buf, NULL, 0); |
abd52a13 | 257 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
258 | |
259 | return count; | |
260 | } | |
261 | ||
262 | static ssize_t w1_master_attribute_show_search(struct device *dev, | |
263 | struct device_attribute *attr, | |
264 | char *buf) | |
265 | { | |
db2d0008 | 266 | struct w1_master *md = dev_to_w1_master(dev); |
2a9d0c17 EP |
267 | ssize_t count; |
268 | ||
abd52a13 | 269 | mutex_lock(&md->mutex); |
2a9d0c17 | 270 | count = sprintf(buf, "%d\n", md->search_count); |
abd52a13 | 271 | mutex_unlock(&md->mutex); |
2a9d0c17 EP |
272 | |
273 | return count; | |
274 | } | |
275 | ||
060b8845 | 276 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 277 | { |
db2d0008 | 278 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 279 | ssize_t count; |
7785925d | 280 | |
abd52a13 | 281 | mutex_lock(&md->mutex); |
1da177e4 | 282 | count = sprintf(buf, "0x%p\n", md->bus_master); |
abd52a13 | 283 | mutex_unlock(&md->mutex); |
1da177e4 LT |
284 | return count; |
285 | } | |
286 | ||
060b8845 | 287 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
288 | { |
289 | ssize_t count; | |
290 | count = sprintf(buf, "%d\n", w1_timeout); | |
291 | return count; | |
292 | } | |
293 | ||
060b8845 | 294 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 295 | { |
db2d0008 | 296 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 297 | ssize_t count; |
7785925d | 298 | |
abd52a13 | 299 | mutex_lock(&md->mutex); |
1da177e4 | 300 | count = sprintf(buf, "%d\n", md->max_slave_count); |
abd52a13 | 301 | mutex_unlock(&md->mutex); |
1da177e4 LT |
302 | return count; |
303 | } | |
304 | ||
060b8845 | 305 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 306 | { |
db2d0008 | 307 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 308 | ssize_t count; |
7785925d | 309 | |
abd52a13 | 310 | mutex_lock(&md->mutex); |
1da177e4 | 311 | count = sprintf(buf, "%lu\n", md->attempts); |
abd52a13 | 312 | mutex_unlock(&md->mutex); |
1da177e4 LT |
313 | return count; |
314 | } | |
315 | ||
060b8845 | 316 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 317 | { |
db2d0008 | 318 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 | 319 | ssize_t count; |
7785925d | 320 | |
abd52a13 | 321 | mutex_lock(&md->mutex); |
1da177e4 | 322 | count = sprintf(buf, "%d\n", md->slave_count); |
abd52a13 | 323 | mutex_unlock(&md->mutex); |
1da177e4 LT |
324 | return count; |
325 | } | |
326 | ||
060b8845 | 327 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 328 | { |
db2d0008 | 329 | struct w1_master *md = dev_to_w1_master(dev); |
1da177e4 LT |
330 | int c = PAGE_SIZE; |
331 | ||
abd52a13 | 332 | mutex_lock(&md->mutex); |
1da177e4 LT |
333 | |
334 | if (md->slave_count == 0) | |
335 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
336 | else { | |
337 | struct list_head *ent, *n; | |
338 | struct w1_slave *sl; | |
339 | ||
340 | list_for_each_safe(ent, n, &md->slist) { | |
341 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
342 | ||
7785925d | 343 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
344 | } |
345 | } | |
346 | ||
abd52a13 | 347 | mutex_unlock(&md->mutex); |
1da177e4 LT |
348 | |
349 | return PAGE_SIZE - c; | |
350 | } | |
351 | ||
7785925d EP |
352 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
353 | struct device_attribute w1_master_attribute_##_name = \ | |
354 | __ATTR(w1_master_##_name, _mode, \ | |
355 | w1_master_attribute_show_##_name, NULL) | |
356 | ||
2a9d0c17 EP |
357 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
358 | struct device_attribute w1_master_attribute_##_name = \ | |
359 | __ATTR(w1_master_##_name, _mode, \ | |
360 | w1_master_attribute_show_##_name, \ | |
361 | w1_master_attribute_store_##_name) | |
362 | ||
7785925d EP |
363 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
364 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
365 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
366 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
367 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
368 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
369 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
2a9d0c17 | 370 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); |
7785925d EP |
371 | |
372 | static struct attribute *w1_master_default_attrs[] = { | |
373 | &w1_master_attribute_name.attr, | |
374 | &w1_master_attribute_slaves.attr, | |
375 | &w1_master_attribute_slave_count.attr, | |
376 | &w1_master_attribute_max_slave_count.attr, | |
377 | &w1_master_attribute_attempts.attr, | |
378 | &w1_master_attribute_timeout.attr, | |
379 | &w1_master_attribute_pointer.attr, | |
2a9d0c17 | 380 | &w1_master_attribute_search.attr, |
7785925d | 381 | NULL |
1da177e4 LT |
382 | }; |
383 | ||
7785925d EP |
384 | static struct attribute_group w1_master_defattr_group = { |
385 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
386 | }; |
387 | ||
7785925d EP |
388 | int w1_create_master_attributes(struct w1_master *master) |
389 | { | |
390 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
391 | } | |
392 | ||
2c5bfdac | 393 | static void w1_destroy_master_attributes(struct w1_master *master) |
7785925d EP |
394 | { |
395 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
396 | } | |
397 | ||
7f772ed8 | 398 | #ifdef CONFIG_HOTPLUG |
c6976a4e AM |
399 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
400 | char *buffer, int buffer_size) | |
7f772ed8 EP |
401 | { |
402 | struct w1_master *md = NULL; | |
403 | struct w1_slave *sl = NULL; | |
404 | char *event_owner, *name; | |
405 | int err, cur_index=0, cur_len=0; | |
406 | ||
407 | if (dev->driver == &w1_master_driver) { | |
408 | md = container_of(dev, struct w1_master, dev); | |
409 | event_owner = "master"; | |
410 | name = md->name; | |
411 | } else if (dev->driver == &w1_slave_driver) { | |
412 | sl = container_of(dev, struct w1_slave, dev); | |
413 | event_owner = "slave"; | |
414 | name = sl->name; | |
415 | } else { | |
312c004d | 416 | dev_dbg(dev, "Unknown event.\n"); |
7f772ed8 EP |
417 | return -EINVAL; |
418 | } | |
419 | ||
c6976a4e AM |
420 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
421 | event_owner, name, dev->bus_id); | |
7f772ed8 EP |
422 | |
423 | if (dev->driver != &w1_slave_driver || !sl) | |
424 | return 0; | |
425 | ||
c6976a4e AM |
426 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
427 | &cur_len, "W1_FID=%02X", sl->reg_num.family); | |
7f772ed8 EP |
428 | if (err) |
429 | return err; | |
430 | ||
c6976a4e AM |
431 | err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, |
432 | &cur_len, "W1_SLAVE_ID=%024LX", | |
433 | (unsigned long long)sl->reg_num.id); | |
d1cf16c9 | 434 | envp[cur_index] = NULL; |
7f772ed8 EP |
435 | if (err) |
436 | return err; | |
437 | ||
438 | return 0; | |
439 | }; | |
440 | #else | |
c6976a4e AM |
441 | static int w1_uevent(struct device *dev, char **envp, int num_envp, |
442 | char *buffer, int buffer_size) | |
7f772ed8 EP |
443 | { |
444 | return 0; | |
445 | } | |
446 | #endif | |
447 | ||
1da177e4 LT |
448 | static int __w1_attach_slave_device(struct w1_slave *sl) |
449 | { | |
450 | int err; | |
451 | ||
452 | sl->dev.parent = &sl->master->dev; | |
7f772ed8 | 453 | sl->dev.driver = &w1_slave_driver; |
1da177e4 LT |
454 | sl->dev.bus = &w1_bus_type; |
455 | sl->dev.release = &w1_slave_release; | |
456 | ||
457 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
458 | "%02x-%012llx", |
459 | (unsigned int) sl->reg_num.family, | |
460 | (unsigned long long) sl->reg_num.id); | |
461 | snprintf(&sl->name[0], sizeof(sl->name), | |
462 | "%02x-%012llx", | |
463 | (unsigned int) sl->reg_num.family, | |
464 | (unsigned long long) sl->reg_num.id); | |
1da177e4 | 465 | |
c6976a4e | 466 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
60ed34be | 467 | &sl->dev.bus_id[0], sl); |
1da177e4 LT |
468 | |
469 | err = device_register(&sl->dev); | |
470 | if (err < 0) { | |
471 | dev_err(&sl->dev, | |
6b729861 EP |
472 | "Device registration [%s] failed. err=%d\n", |
473 | sl->dev.bus_id, err); | |
1da177e4 LT |
474 | return err; |
475 | } | |
476 | ||
d2a4ef6a EP |
477 | /* Create "name" entry */ |
478 | err = device_create_file(&sl->dev, &w1_slave_attr_name); | |
479 | if (err < 0) { | |
480 | dev_err(&sl->dev, | |
481 | "sysfs file creation for [%s] failed. err=%d\n", | |
482 | sl->dev.bus_id, err); | |
483 | goto out_unreg; | |
484 | } | |
1da177e4 | 485 | |
d2a4ef6a EP |
486 | /* Create "id" entry */ |
487 | err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
1da177e4 LT |
488 | if (err < 0) { |
489 | dev_err(&sl->dev, | |
6b729861 EP |
490 | "sysfs file creation for [%s] failed. err=%d\n", |
491 | sl->dev.bus_id, err); | |
d2a4ef6a | 492 | goto out_rem1; |
1da177e4 LT |
493 | } |
494 | ||
d2a4ef6a EP |
495 | /* if the family driver needs to initialize something... */ |
496 | if (sl->family->fops && sl->family->fops->add_slave && | |
497 | ((err = sl->family->fops->add_slave(sl)) < 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_rem2; | |
1da177e4 LT |
502 | } |
503 | ||
504 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
505 | ||
506 | return 0; | |
d2a4ef6a EP |
507 | |
508 | out_rem2: | |
509 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); | |
510 | out_rem1: | |
511 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
512 | out_unreg: | |
513 | device_unregister(&sl->dev); | |
514 | return err; | |
1da177e4 LT |
515 | } |
516 | ||
517 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
518 | { | |
519 | struct w1_slave *sl; | |
520 | struct w1_family *f; | |
521 | int err; | |
522 | struct w1_netlink_msg msg; | |
523 | ||
dd00cc48 | 524 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4 LT |
525 | if (!sl) { |
526 | dev_err(&dev->dev, | |
527 | "%s: failed to allocate new slave device.\n", | |
528 | __func__); | |
529 | return -ENOMEM; | |
530 | } | |
531 | ||
1da177e4 LT |
532 | |
533 | sl->owner = THIS_MODULE; | |
534 | sl->master = dev; | |
535 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
536 | ||
12003375 | 537 | memset(&msg, 0, sizeof(msg)); |
1da177e4 LT |
538 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
539 | atomic_set(&sl->refcnt, 0); | |
3aca692d | 540 | init_completion(&sl->released); |
1da177e4 LT |
541 | |
542 | spin_lock(&w1_flock); | |
543 | f = w1_family_registered(rn->family); | |
544 | if (!f) { | |
99c5bfe9 | 545 | f= &w1_default_family; |
1da177e4 LT |
546 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
547 | rn->family, rn->family, | |
548 | (unsigned long long)rn->id, rn->crc); | |
1da177e4 LT |
549 | } |
550 | __w1_family_get(f); | |
551 | spin_unlock(&w1_flock); | |
552 | ||
553 | sl->family = f; | |
554 | ||
555 | ||
556 | err = __w1_attach_slave_device(sl); | |
557 | if (err < 0) { | |
558 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
559 | sl->name); | |
560 | w1_family_put(sl->family); | |
561 | kfree(sl); | |
562 | return err; | |
563 | } | |
564 | ||
565 | sl->ttl = dev->slave_ttl; | |
566 | dev->slave_count++; | |
567 | ||
12003375 | 568 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4 LT |
569 | msg.type = W1_SLAVE_ADD; |
570 | w1_netlink_send(dev, &msg); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static void w1_slave_detach(struct w1_slave *sl) | |
576 | { | |
577 | struct w1_netlink_msg msg; | |
7785925d | 578 | |
7c8f5703 | 579 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); |
1da177e4 | 580 | |
3aca692d | 581 | list_del(&sl->w1_slave_entry); |
1da177e4 | 582 | |
d2a4ef6a EP |
583 | if (sl->family->fops && sl->family->fops->remove_slave) |
584 | sl->family->fops->remove_slave(sl); | |
585 | ||
12003375 EP |
586 | memset(&msg, 0, sizeof(msg)); |
587 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); | |
3aca692d EP |
588 | msg.type = W1_SLAVE_REMOVE; |
589 | w1_netlink_send(sl->master, &msg); | |
590 | ||
d2a4ef6a EP |
591 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); |
592 | device_remove_file(&sl->dev, &w1_slave_attr_name); | |
1da177e4 | 593 | device_unregister(&sl->dev); |
1da177e4 | 594 | |
3aca692d EP |
595 | wait_for_completion(&sl->released); |
596 | kfree(sl); | |
1da177e4 LT |
597 | } |
598 | ||
ccd69940 | 599 | static struct w1_master *w1_search_master(void *data) |
1da177e4 LT |
600 | { |
601 | struct w1_master *dev; | |
602 | int found = 0; | |
7785925d | 603 | |
abd52a13 | 604 | mutex_lock(&w1_mlock); |
1da177e4 LT |
605 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
606 | if (dev->bus_master->data == data) { | |
607 | found = 1; | |
608 | atomic_inc(&dev->refcnt); | |
609 | break; | |
610 | } | |
611 | } | |
abd52a13 | 612 | mutex_unlock(&w1_mlock); |
1da177e4 LT |
613 | |
614 | return (found)?dev:NULL; | |
615 | } | |
616 | ||
12003375 EP |
617 | struct w1_master *w1_search_master_id(u32 id) |
618 | { | |
619 | struct w1_master *dev; | |
620 | int found = 0; | |
621 | ||
abd52a13 | 622 | mutex_lock(&w1_mlock); |
12003375 EP |
623 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
624 | if (dev->id == id) { | |
625 | found = 1; | |
626 | atomic_inc(&dev->refcnt); | |
627 | break; | |
628 | } | |
629 | } | |
abd52a13 | 630 | mutex_unlock(&w1_mlock); |
12003375 EP |
631 | |
632 | return (found)?dev:NULL; | |
633 | } | |
634 | ||
635 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) | |
636 | { | |
637 | struct w1_master *dev; | |
638 | struct w1_slave *sl = NULL; | |
639 | int found = 0; | |
640 | ||
abd52a13 | 641 | mutex_lock(&w1_mlock); |
12003375 | 642 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a13 | 643 | mutex_lock(&dev->mutex); |
12003375 EP |
644 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
645 | if (sl->reg_num.family == id->family && | |
646 | sl->reg_num.id == id->id && | |
647 | sl->reg_num.crc == id->crc) { | |
648 | found = 1; | |
649 | atomic_inc(&dev->refcnt); | |
650 | atomic_inc(&sl->refcnt); | |
651 | break; | |
652 | } | |
653 | } | |
abd52a13 | 654 | mutex_unlock(&dev->mutex); |
12003375 EP |
655 | |
656 | if (found) | |
657 | break; | |
658 | } | |
abd52a13 | 659 | mutex_unlock(&w1_mlock); |
12003375 EP |
660 | |
661 | return (found)?sl:NULL; | |
662 | } | |
663 | ||
6adf87bd EP |
664 | void w1_reconnect_slaves(struct w1_family *f) |
665 | { | |
666 | struct w1_master *dev; | |
667 | ||
abd52a13 | 668 | mutex_lock(&w1_mlock); |
6adf87bd | 669 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
7c8f5703 | 670 | dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", |
6adf87bd EP |
671 | dev->name, f->fid); |
672 | set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); | |
673 | } | |
abd52a13 | 674 | mutex_unlock(&w1_mlock); |
6adf87bd EP |
675 | } |
676 | ||
ccd69940 | 677 | static void w1_slave_found(void *data, u64 rn) |
1da177e4 LT |
678 | { |
679 | int slave_count; | |
680 | struct w1_slave *sl; | |
681 | struct list_head *ent; | |
682 | struct w1_reg_num *tmp; | |
683 | int family_found = 0; | |
684 | struct w1_master *dev; | |
0e65f828 | 685 | u64 rn_le = cpu_to_le64(rn); |
1da177e4 LT |
686 | |
687 | dev = w1_search_master(data); | |
688 | if (!dev) { | |
ccd69940 EP |
689 | printk(KERN_ERR "Failed to find w1 master device for data %p, " |
690 | "it is impossible.\n", data); | |
1da177e4 LT |
691 | return; |
692 | } | |
7785925d | 693 | |
1da177e4 LT |
694 | tmp = (struct w1_reg_num *) &rn; |
695 | ||
696 | slave_count = 0; | |
697 | list_for_each(ent, &dev->slist) { | |
698 | ||
699 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
700 | ||
701 | if (sl->reg_num.family == tmp->family && | |
702 | sl->reg_num.id == tmp->id && | |
703 | sl->reg_num.crc == tmp->crc) { | |
704 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
705 | break; | |
7785925d | 706 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
707 | family_found = 1; |
708 | break; | |
709 | } | |
710 | ||
711 | slave_count++; | |
712 | } | |
713 | ||
8523ff45 | 714 | if (slave_count == dev->slave_count && |
0e65f828 | 715 | rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { |
8523ff45 | 716 | w1_attach_slave_device(dev, tmp); |
1da177e4 | 717 | } |
7785925d | 718 | |
1da177e4 LT |
719 | atomic_dec(&dev->refcnt); |
720 | } | |
721 | ||
6b729861 EP |
722 | /** |
723 | * Performs a ROM Search & registers any devices found. | |
724 | * The 1-wire search is a simple binary tree search. | |
725 | * For each bit of the address, we read two bits and write one bit. | |
726 | * The bit written will put to sleep all devies that don't match that bit. | |
727 | * When the two reads differ, the direction choice is obvious. | |
728 | * When both bits are 0, we must choose a path to take. | |
729 | * When we can scan all 64 bits without having to choose a path, we are done. | |
730 | * | |
731 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
732 | * | |
733 | * @dev The master device to search | |
734 | * @cb Function to call when a device is found | |
735 | */ | |
12003375 | 736 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4 | 737 | { |
6b729861 EP |
738 | u64 last_rn, rn, tmp64; |
739 | int i, slave_count = 0; | |
740 | int last_zero, last_device; | |
741 | int search_bit, desc_bit; | |
742 | u8 triplet_ret = 0; | |
1da177e4 | 743 | |
6b729861 EP |
744 | search_bit = 0; |
745 | rn = last_rn = 0; | |
746 | last_device = 0; | |
747 | last_zero = -1; | |
1da177e4 LT |
748 | |
749 | desc_bit = 64; | |
750 | ||
6b729861 EP |
751 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
752 | last_rn = rn; | |
1da177e4 LT |
753 | rn = 0; |
754 | ||
1da177e4 LT |
755 | /* |
756 | * Reset bus and all 1-wire device state machines | |
757 | * so they can respond to our requests. | |
758 | * | |
759 | * Return 0 - device(s) present, 1 - no devices present. | |
760 | */ | |
761 | if (w1_reset_bus(dev)) { | |
2da5bf80 | 762 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
1da177e4 LT |
763 | break; |
764 | } | |
765 | ||
6b729861 | 766 | /* Start the search */ |
12003375 | 767 | w1_write_8(dev, search_type); |
1da177e4 | 768 | for (i = 0; i < 64; ++i) { |
6b729861 EP |
769 | /* Determine the direction/search bit */ |
770 | if (i == desc_bit) | |
771 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
772 | else if (i > desc_bit) | |
773 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 774 | else |
6b729861 | 775 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 776 | |
6b729861 EP |
777 | /** Read two bits and write one bit */ |
778 | triplet_ret = w1_triplet(dev, search_bit); | |
779 | ||
780 | /* quit if no device responded */ | |
781 | if ( (triplet_ret & 0x03) == 0x03 ) | |
782 | break; | |
1da177e4 | 783 | |
6b729861 EP |
784 | /* If both directions were valid, and we took the 0 path... */ |
785 | if (triplet_ret == 0) | |
786 | last_zero = i; | |
1da177e4 | 787 | |
6b729861 EP |
788 | /* extract the direction taken & update the device number */ |
789 | tmp64 = (triplet_ret >> 2); | |
790 | rn |= (tmp64 << i); | |
791 | } | |
7785925d | 792 | |
6b729861 EP |
793 | if ( (triplet_ret & 0x03) != 0x03 ) { |
794 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
795 | last_device = 1; | |
796 | desc_bit = last_zero; | |
797 | cb(dev->bus_master->data, rn); | |
798 | } | |
1da177e4 LT |
799 | } |
800 | } | |
801 | ||
7785925d | 802 | static int w1_control(void *data) |
1da177e4 | 803 | { |
7785925d EP |
804 | struct w1_slave *sl, *sln; |
805 | struct w1_master *dev, *n; | |
674a396c | 806 | int have_to_wait = 0; |
1da177e4 | 807 | |
83144186 | 808 | set_freezable(); |
674a396c | 809 | while (!kthread_should_stop() || have_to_wait) { |
1da177e4 LT |
810 | have_to_wait = 0; |
811 | ||
3e1d1d28 | 812 | try_to_freeze(); |
3aca692d | 813 | msleep_interruptible(w1_control_timeout * 1000); |
1da177e4 | 814 | |
7785925d | 815 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
674a396c | 816 | if (!kthread_should_stop() && !dev->flags) |
1da177e4 LT |
817 | continue; |
818 | /* | |
819 | * Little race: we can create thread but not set the flag. | |
820 | * Get a chance for external process to set flag up. | |
821 | */ | |
822 | if (!dev->initialized) { | |
823 | have_to_wait = 1; | |
824 | continue; | |
825 | } | |
826 | ||
674a396c | 827 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
6adf87bd | 828 | set_bit(W1_MASTER_NEED_EXIT, &dev->flags); |
1da177e4 | 829 | |
abd52a13 | 830 | mutex_lock(&w1_mlock); |
6adf87bd | 831 | list_del(&dev->w1_master_entry); |
abd52a13 | 832 | mutex_unlock(&w1_mlock); |
6adf87bd | 833 | |
abd52a13 | 834 | mutex_lock(&dev->mutex); |
6adf87bd | 835 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd | 836 | w1_slave_detach(sl); |
6adf87bd EP |
837 | } |
838 | w1_destroy_master_attributes(dev); | |
abd52a13 | 839 | mutex_unlock(&dev->mutex); |
6adf87bd EP |
840 | atomic_dec(&dev->refcnt); |
841 | continue; | |
842 | } | |
843 | ||
844 | if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { | |
7c8f5703 | 845 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); |
abd52a13 | 846 | mutex_lock(&dev->mutex); |
3aca692d | 847 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
6adf87bd EP |
848 | if (sl->family->fid == W1_FAMILY_DEFAULT) { |
849 | struct w1_reg_num rn; | |
6adf87bd EP |
850 | |
851 | memcpy(&rn, &sl->reg_num, sizeof(rn)); | |
3aca692d | 852 | w1_slave_detach(sl); |
1da177e4 | 853 | |
6adf87bd EP |
854 | w1_attach_slave_device(dev, &rn); |
855 | } | |
856 | } | |
7c8f5703 | 857 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); |
6adf87bd | 858 | clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); |
abd52a13 | 859 | mutex_unlock(&dev->mutex); |
1da177e4 | 860 | } |
1da177e4 LT |
861 | } |
862 | } | |
863 | ||
674a396c | 864 | return 0; |
1da177e4 LT |
865 | } |
866 | ||
12003375 EP |
867 | void w1_search_process(struct w1_master *dev, u8 search_type) |
868 | { | |
869 | struct w1_slave *sl, *sln; | |
870 | ||
871 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) | |
872 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
873 | ||
874 | w1_search_devices(dev, search_type, w1_slave_found); | |
875 | ||
876 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { | |
877 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
878 | w1_slave_detach(sl); | |
879 | ||
880 | dev->slave_count--; | |
881 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) | |
882 | sl->ttl = dev->slave_ttl; | |
883 | } | |
884 | ||
885 | if (dev->search_count > 0) | |
886 | dev->search_count--; | |
887 | } | |
888 | ||
1da177e4 LT |
889 | int w1_process(void *data) |
890 | { | |
891 | struct w1_master *dev = (struct w1_master *) data; | |
1da177e4 | 892 | |
674a396c | 893 | while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { |
3e1d1d28 | 894 | try_to_freeze(); |
1da177e4 LT |
895 | msleep_interruptible(w1_timeout * 1000); |
896 | ||
674a396c | 897 | if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) |
1da177e4 LT |
898 | break; |
899 | ||
900 | if (!dev->initialized) | |
901 | continue; | |
902 | ||
2a9d0c17 EP |
903 | if (dev->search_count == 0) |
904 | continue; | |
905 | ||
abd52a13 | 906 | mutex_lock(&dev->mutex); |
12003375 | 907 | w1_search_process(dev, W1_SEARCH); |
abd52a13 | 908 | mutex_unlock(&dev->mutex); |
1da177e4 LT |
909 | } |
910 | ||
911 | atomic_dec(&dev->refcnt); | |
1da177e4 LT |
912 | |
913 | return 0; | |
914 | } | |
915 | ||
7785925d | 916 | static int w1_init(void) |
1da177e4 LT |
917 | { |
918 | int retval; | |
919 | ||
920 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
921 | ||
12003375 EP |
922 | w1_init_netlink(); |
923 | ||
1da177e4 LT |
924 | retval = bus_register(&w1_bus_type); |
925 | if (retval) { | |
926 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
927 | goto err_out_exit_init; | |
928 | } | |
929 | ||
7f772ed8 | 930 | retval = driver_register(&w1_master_driver); |
1da177e4 LT |
931 | if (retval) { |
932 | printk(KERN_ERR | |
933 | "Failed to register master driver. err=%d.\n", | |
934 | retval); | |
935 | goto err_out_bus_unregister; | |
936 | } | |
937 | ||
7f772ed8 EP |
938 | retval = driver_register(&w1_slave_driver); |
939 | if (retval) { | |
940 | printk(KERN_ERR | |
941 | "Failed to register master driver. err=%d.\n", | |
942 | retval); | |
943 | goto err_out_master_unregister; | |
944 | } | |
945 | ||
674a396c EP |
946 | w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); |
947 | if (IS_ERR(w1_control_thread)) { | |
948 | retval = PTR_ERR(w1_control_thread); | |
1da177e4 | 949 | printk(KERN_ERR "Failed to create control thread. err=%d\n", |
674a396c | 950 | retval); |
7f772ed8 | 951 | goto err_out_slave_unregister; |
1da177e4 LT |
952 | } |
953 | ||
954 | return 0; | |
955 | ||
7f772ed8 EP |
956 | err_out_slave_unregister: |
957 | driver_unregister(&w1_slave_driver); | |
958 | ||
959 | err_out_master_unregister: | |
960 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
961 | |
962 | err_out_bus_unregister: | |
963 | bus_unregister(&w1_bus_type); | |
964 | ||
965 | err_out_exit_init: | |
966 | return retval; | |
967 | } | |
968 | ||
7785925d | 969 | static void w1_fini(void) |
1da177e4 LT |
970 | { |
971 | struct w1_master *dev; | |
1da177e4 | 972 | |
7785925d | 973 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 974 | __w1_remove_master_device(dev); |
1da177e4 | 975 | |
12003375 EP |
976 | w1_fini_netlink(); |
977 | ||
674a396c | 978 | kthread_stop(w1_control_thread); |
1da177e4 | 979 | |
7f772ed8 EP |
980 | driver_unregister(&w1_slave_driver); |
981 | driver_unregister(&w1_master_driver); | |
1da177e4 LT |
982 | bus_unregister(&w1_bus_type); |
983 | } | |
984 | ||
985 | module_init(w1_init); | |
986 | module_exit(w1_fini); |