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1da177e4 LT |
1 | /* |
2 | * w1.c | |
3 | * | |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
5 | * | |
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> | |
33 | ||
34 | #include <asm/atomic.h> | |
35 | ||
36 | #include "w1.h" | |
37 | #include "w1_io.h" | |
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; | |
48 | int w1_max_slave_count = 10; | |
49 | int w1_max_slave_ttl = 10; | |
50 | ||
51 | module_param_named(timeout, w1_timeout, int, 0); | |
52 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); | |
53 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); | |
54 | ||
55 | DEFINE_SPINLOCK(w1_mlock); | |
56 | LIST_HEAD(w1_masters); | |
57 | ||
58 | static pid_t control_thread; | |
59 | static int control_needs_exit; | |
60 | static DECLARE_COMPLETION(w1_control_complete); | |
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 | ||
72 | static int w1_master_remove(struct device *dev) | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void w1_master_release(struct device *dev) | |
78 | { | |
79 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
80 | ||
81 | complete(&md->dev_released); | |
82 | } | |
83 | ||
84 | static void w1_slave_release(struct device *dev) | |
85 | { | |
86 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
87 | ||
88 | complete(&sl->dev_released); | |
89 | } | |
90 | ||
060b8845 | 91 | static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
92 | { |
93 | return sprintf(buf, "No family registered.\n"); | |
94 | } | |
95 | ||
96 | static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off, | |
97 | size_t count) | |
98 | { | |
99 | return sprintf(buf, "No family registered.\n"); | |
100 | } | |
101 | ||
102 | static struct bus_type w1_bus_type = { | |
103 | .name = "w1", | |
104 | .match = w1_master_match, | |
105 | }; | |
106 | ||
107 | struct device_driver w1_driver = { | |
108 | .name = "w1_driver", | |
109 | .bus = &w1_bus_type, | |
110 | .probe = w1_master_probe, | |
111 | .remove = w1_master_remove, | |
112 | }; | |
113 | ||
114 | struct device w1_device = { | |
115 | .parent = NULL, | |
116 | .bus = &w1_bus_type, | |
117 | .bus_id = "w1 bus master", | |
118 | .driver = &w1_driver, | |
119 | .release = &w1_master_release | |
120 | }; | |
121 | ||
122 | static struct device_attribute w1_slave_attribute = { | |
123 | .attr = { | |
124 | .name = "name", | |
125 | .mode = S_IRUGO, | |
126 | .owner = THIS_MODULE | |
127 | }, | |
128 | .show = &w1_default_read_name, | |
129 | }; | |
130 | ||
131 | static struct device_attribute w1_slave_attribute_val = { | |
132 | .attr = { | |
133 | .name = "value", | |
134 | .mode = S_IRUGO, | |
135 | .owner = THIS_MODULE | |
136 | }, | |
137 | .show = &w1_default_read_name, | |
138 | }; | |
139 | ||
060b8845 | 140 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
141 | { |
142 | struct w1_master *md = container_of (dev, struct w1_master, dev); | |
143 | ssize_t count; | |
144 | ||
145 | if (down_interruptible (&md->mutex)) | |
146 | return -EBUSY; | |
147 | ||
148 | count = sprintf(buf, "%s\n", md->name); | |
149 | ||
150 | up(&md->mutex); | |
151 | ||
152 | return count; | |
153 | } | |
154 | ||
060b8845 | 155 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
156 | { |
157 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
158 | ssize_t count; | |
159 | ||
160 | if (down_interruptible(&md->mutex)) | |
161 | return -EBUSY; | |
162 | ||
163 | count = sprintf(buf, "0x%p\n", md->bus_master); | |
164 | ||
165 | up(&md->mutex); | |
166 | return count; | |
167 | } | |
168 | ||
060b8845 | 169 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
170 | { |
171 | ssize_t count; | |
172 | count = sprintf(buf, "%d\n", w1_timeout); | |
173 | return count; | |
174 | } | |
175 | ||
060b8845 | 176 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
177 | { |
178 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
179 | ssize_t count; | |
180 | ||
181 | if (down_interruptible(&md->mutex)) | |
182 | return -EBUSY; | |
183 | ||
184 | count = sprintf(buf, "%d\n", md->max_slave_count); | |
185 | ||
186 | up(&md->mutex); | |
187 | return count; | |
188 | } | |
189 | ||
060b8845 | 190 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
191 | { |
192 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
193 | ssize_t count; | |
194 | ||
195 | if (down_interruptible(&md->mutex)) | |
196 | return -EBUSY; | |
197 | ||
198 | count = sprintf(buf, "%lu\n", md->attempts); | |
199 | ||
200 | up(&md->mutex); | |
201 | return count; | |
202 | } | |
203 | ||
060b8845 | 204 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
205 | { |
206 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
207 | ssize_t count; | |
208 | ||
209 | if (down_interruptible(&md->mutex)) | |
210 | return -EBUSY; | |
211 | ||
212 | count = sprintf(buf, "%d\n", md->slave_count); | |
213 | ||
214 | up(&md->mutex); | |
215 | return count; | |
216 | } | |
217 | ||
060b8845 | 218 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
219 | |
220 | { | |
221 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
222 | int c = PAGE_SIZE; | |
223 | ||
224 | if (down_interruptible(&md->mutex)) | |
225 | return -EBUSY; | |
226 | ||
227 | if (md->slave_count == 0) | |
228 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
229 | else { | |
230 | struct list_head *ent, *n; | |
231 | struct w1_slave *sl; | |
232 | ||
233 | list_for_each_safe(ent, n, &md->slist) { | |
234 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
235 | ||
236 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); | |
237 | } | |
238 | } | |
239 | ||
240 | up(&md->mutex); | |
241 | ||
242 | return PAGE_SIZE - c; | |
243 | } | |
244 | ||
245 | static struct device_attribute w1_master_attribute_slaves = { | |
246 | .attr = { | |
247 | .name = "w1_master_slaves", | |
248 | .mode = S_IRUGO, | |
249 | .owner = THIS_MODULE, | |
250 | }, | |
251 | .show = &w1_master_attribute_show_slaves, | |
252 | }; | |
253 | static struct device_attribute w1_master_attribute_slave_count = { | |
254 | .attr = { | |
255 | .name = "w1_master_slave_count", | |
256 | .mode = S_IRUGO, | |
257 | .owner = THIS_MODULE | |
258 | }, | |
259 | .show = &w1_master_attribute_show_slave_count, | |
260 | }; | |
261 | static struct device_attribute w1_master_attribute_attempts = { | |
262 | .attr = { | |
263 | .name = "w1_master_attempts", | |
264 | .mode = S_IRUGO, | |
265 | .owner = THIS_MODULE | |
266 | }, | |
267 | .show = &w1_master_attribute_show_attempts, | |
268 | }; | |
269 | static struct device_attribute w1_master_attribute_max_slave_count = { | |
270 | .attr = { | |
271 | .name = "w1_master_max_slave_count", | |
272 | .mode = S_IRUGO, | |
273 | .owner = THIS_MODULE | |
274 | }, | |
275 | .show = &w1_master_attribute_show_max_slave_count, | |
276 | }; | |
277 | static struct device_attribute w1_master_attribute_timeout = { | |
278 | .attr = { | |
279 | .name = "w1_master_timeout", | |
280 | .mode = S_IRUGO, | |
281 | .owner = THIS_MODULE | |
282 | }, | |
283 | .show = &w1_master_attribute_show_timeout, | |
284 | }; | |
285 | static struct device_attribute w1_master_attribute_pointer = { | |
286 | .attr = { | |
287 | .name = "w1_master_pointer", | |
288 | .mode = S_IRUGO, | |
289 | .owner = THIS_MODULE | |
290 | }, | |
291 | .show = &w1_master_attribute_show_pointer, | |
292 | }; | |
293 | static struct device_attribute w1_master_attribute_name = { | |
294 | .attr = { | |
295 | .name = "w1_master_name", | |
296 | .mode = S_IRUGO, | |
297 | .owner = THIS_MODULE | |
298 | }, | |
299 | .show = &w1_master_attribute_show_name, | |
300 | }; | |
301 | ||
302 | static struct bin_attribute w1_slave_bin_attribute = { | |
303 | .attr = { | |
304 | .name = "w1_slave", | |
305 | .mode = S_IRUGO, | |
306 | .owner = THIS_MODULE, | |
307 | }, | |
308 | .size = W1_SLAVE_DATA_SIZE, | |
309 | .read = &w1_default_read_bin, | |
310 | }; | |
311 | ||
312 | static int __w1_attach_slave_device(struct w1_slave *sl) | |
313 | { | |
314 | int err; | |
315 | ||
316 | sl->dev.parent = &sl->master->dev; | |
317 | sl->dev.driver = sl->master->driver; | |
318 | sl->dev.bus = &w1_bus_type; | |
319 | sl->dev.release = &w1_slave_release; | |
320 | ||
321 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
322 | "%02x-%012llx", | |
323 | (unsigned int) sl->reg_num.family, | |
324 | (unsigned long long) sl->reg_num.id); | |
325 | snprintf (&sl->name[0], sizeof(sl->name), | |
326 | "%02x-%012llx", | |
327 | (unsigned int) sl->reg_num.family, | |
328 | (unsigned long long) sl->reg_num.id); | |
329 | ||
330 | dev_dbg(&sl->dev, "%s: registering %s.\n", __func__, | |
331 | &sl->dev.bus_id[0]); | |
332 | ||
333 | err = device_register(&sl->dev); | |
334 | if (err < 0) { | |
335 | dev_err(&sl->dev, | |
336 | "Device registration [%s] failed. err=%d\n", | |
337 | sl->dev.bus_id, err); | |
338 | return err; | |
339 | } | |
340 | ||
341 | memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin)); | |
342 | memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name)); | |
343 | memcpy(&sl->attr_val, &w1_slave_attribute_val, sizeof(sl->attr_val)); | |
344 | ||
345 | sl->attr_bin.read = sl->family->fops->rbin; | |
346 | sl->attr_name.show = sl->family->fops->rname; | |
347 | sl->attr_val.show = sl->family->fops->rval; | |
348 | sl->attr_val.attr.name = sl->family->fops->rvalname; | |
349 | ||
350 | err = device_create_file(&sl->dev, &sl->attr_name); | |
351 | if (err < 0) { | |
352 | dev_err(&sl->dev, | |
353 | "sysfs file creation for [%s] failed. err=%d\n", | |
354 | sl->dev.bus_id, err); | |
355 | device_unregister(&sl->dev); | |
356 | return err; | |
357 | } | |
358 | ||
359 | err = device_create_file(&sl->dev, &sl->attr_val); | |
360 | if (err < 0) { | |
361 | dev_err(&sl->dev, | |
362 | "sysfs file creation for [%s] failed. err=%d\n", | |
363 | sl->dev.bus_id, err); | |
364 | device_remove_file(&sl->dev, &sl->attr_name); | |
365 | device_unregister(&sl->dev); | |
366 | return err; | |
367 | } | |
368 | ||
369 | err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin); | |
370 | if (err < 0) { | |
371 | dev_err(&sl->dev, | |
372 | "sysfs file creation for [%s] failed. err=%d\n", | |
373 | sl->dev.bus_id, err); | |
374 | device_remove_file(&sl->dev, &sl->attr_name); | |
375 | device_remove_file(&sl->dev, &sl->attr_val); | |
376 | device_unregister(&sl->dev); | |
377 | return err; | |
378 | } | |
379 | ||
380 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
386 | { | |
387 | struct w1_slave *sl; | |
388 | struct w1_family *f; | |
389 | int err; | |
390 | struct w1_netlink_msg msg; | |
391 | ||
392 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
393 | if (!sl) { | |
394 | dev_err(&dev->dev, | |
395 | "%s: failed to allocate new slave device.\n", | |
396 | __func__); | |
397 | return -ENOMEM; | |
398 | } | |
399 | ||
400 | memset(sl, 0, sizeof(*sl)); | |
401 | ||
402 | sl->owner = THIS_MODULE; | |
403 | sl->master = dev; | |
404 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
405 | ||
406 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); | |
407 | atomic_set(&sl->refcnt, 0); | |
408 | init_completion(&sl->dev_released); | |
409 | ||
410 | spin_lock(&w1_flock); | |
411 | f = w1_family_registered(rn->family); | |
412 | if (!f) { | |
413 | spin_unlock(&w1_flock); | |
414 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", | |
415 | rn->family, rn->family, | |
416 | (unsigned long long)rn->id, rn->crc); | |
417 | kfree(sl); | |
418 | return -ENODEV; | |
419 | } | |
420 | __w1_family_get(f); | |
421 | spin_unlock(&w1_flock); | |
422 | ||
423 | sl->family = f; | |
424 | ||
425 | ||
426 | err = __w1_attach_slave_device(sl); | |
427 | if (err < 0) { | |
428 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
429 | sl->name); | |
430 | w1_family_put(sl->family); | |
431 | kfree(sl); | |
432 | return err; | |
433 | } | |
434 | ||
435 | sl->ttl = dev->slave_ttl; | |
436 | dev->slave_count++; | |
437 | ||
438 | memcpy(&msg.id.id, rn, sizeof(msg.id.id)); | |
439 | msg.type = W1_SLAVE_ADD; | |
440 | w1_netlink_send(dev, &msg); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static void w1_slave_detach(struct w1_slave *sl) | |
446 | { | |
447 | struct w1_netlink_msg msg; | |
448 | ||
449 | dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name); | |
450 | ||
451 | while (atomic_read(&sl->refcnt)) { | |
452 | printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", | |
453 | sl->name, atomic_read(&sl->refcnt)); | |
454 | ||
455 | if (msleep_interruptible(1000)) | |
456 | flush_signals(current); | |
457 | } | |
458 | ||
459 | sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin); | |
460 | device_remove_file(&sl->dev, &sl->attr_name); | |
461 | device_remove_file(&sl->dev, &sl->attr_val); | |
462 | device_unregister(&sl->dev); | |
463 | w1_family_put(sl->family); | |
464 | ||
465 | memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); | |
466 | msg.type = W1_SLAVE_REMOVE; | |
467 | w1_netlink_send(sl->master, &msg); | |
468 | } | |
469 | ||
470 | static struct w1_master *w1_search_master(unsigned long data) | |
471 | { | |
472 | struct w1_master *dev; | |
473 | int found = 0; | |
474 | ||
475 | spin_lock_irq(&w1_mlock); | |
476 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { | |
477 | if (dev->bus_master->data == data) { | |
478 | found = 1; | |
479 | atomic_inc(&dev->refcnt); | |
480 | break; | |
481 | } | |
482 | } | |
483 | spin_unlock_irq(&w1_mlock); | |
484 | ||
485 | return (found)?dev:NULL; | |
486 | } | |
487 | ||
488 | void w1_slave_found(unsigned long data, u64 rn) | |
489 | { | |
490 | int slave_count; | |
491 | struct w1_slave *sl; | |
492 | struct list_head *ent; | |
493 | struct w1_reg_num *tmp; | |
494 | int family_found = 0; | |
495 | struct w1_master *dev; | |
496 | ||
497 | dev = w1_search_master(data); | |
498 | if (!dev) { | |
499 | printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n", | |
500 | data); | |
501 | return; | |
502 | } | |
503 | ||
504 | tmp = (struct w1_reg_num *) &rn; | |
505 | ||
506 | slave_count = 0; | |
507 | list_for_each(ent, &dev->slist) { | |
508 | ||
509 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
510 | ||
511 | if (sl->reg_num.family == tmp->family && | |
512 | sl->reg_num.id == tmp->id && | |
513 | sl->reg_num.crc == tmp->crc) { | |
514 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
515 | break; | |
516 | } | |
517 | else if (sl->reg_num.family == tmp->family) { | |
518 | family_found = 1; | |
519 | break; | |
520 | } | |
521 | ||
522 | slave_count++; | |
523 | } | |
524 | ||
8523ff45 EP |
525 | rn = cpu_to_le64(rn); |
526 | ||
527 | if (slave_count == dev->slave_count && | |
528 | rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) { | |
529 | w1_attach_slave_device(dev, tmp); | |
1da177e4 LT |
530 | } |
531 | ||
532 | atomic_dec(&dev->refcnt); | |
533 | } | |
534 | ||
535 | void w1_search(struct w1_master *dev) | |
536 | { | |
537 | u64 last, rn, tmp; | |
538 | int i, count = 0; | |
539 | int last_family_desc, last_zero, last_device; | |
540 | int search_bit, id_bit, comp_bit, desc_bit; | |
541 | ||
542 | search_bit = id_bit = comp_bit = 0; | |
543 | rn = tmp = last = 0; | |
544 | last_device = last_zero = last_family_desc = 0; | |
545 | ||
546 | desc_bit = 64; | |
547 | ||
548 | while (!(id_bit && comp_bit) && !last_device | |
549 | && count++ < dev->max_slave_count) { | |
550 | last = rn; | |
551 | rn = 0; | |
552 | ||
553 | last_family_desc = 0; | |
554 | ||
555 | /* | |
556 | * Reset bus and all 1-wire device state machines | |
557 | * so they can respond to our requests. | |
558 | * | |
559 | * Return 0 - device(s) present, 1 - no devices present. | |
560 | */ | |
561 | if (w1_reset_bus(dev)) { | |
562 | dev_info(&dev->dev, "No devices present on the wire.\n"); | |
563 | break; | |
564 | } | |
565 | ||
566 | #if 1 | |
567 | w1_write_8(dev, W1_SEARCH); | |
568 | for (i = 0; i < 64; ++i) { | |
569 | /* | |
570 | * Read 2 bits from bus. | |
571 | * All who don't sleep must send ID bit and COMPLEMENT ID bit. | |
572 | * They actually are ANDed between all senders. | |
573 | */ | |
574 | id_bit = w1_touch_bit(dev, 1); | |
575 | comp_bit = w1_touch_bit(dev, 1); | |
576 | ||
577 | if (id_bit && comp_bit) | |
578 | break; | |
579 | ||
580 | if (id_bit == 0 && comp_bit == 0) { | |
581 | if (i == desc_bit) | |
582 | search_bit = 1; | |
583 | else if (i > desc_bit) | |
584 | search_bit = 0; | |
585 | else | |
586 | search_bit = ((last >> i) & 0x1); | |
587 | ||
588 | if (search_bit == 0) { | |
589 | last_zero = i; | |
590 | if (last_zero < 9) | |
591 | last_family_desc = last_zero; | |
592 | } | |
593 | ||
594 | } | |
595 | else | |
596 | search_bit = id_bit; | |
597 | ||
598 | tmp = search_bit; | |
599 | rn |= (tmp << i); | |
600 | ||
601 | /* | |
602 | * Write 1 bit to bus | |
603 | * and make all who don't have "search_bit" in "i"'th position | |
604 | * in it's registration number sleep. | |
605 | */ | |
606 | if (dev->bus_master->touch_bit) | |
607 | w1_touch_bit(dev, search_bit); | |
608 | else | |
609 | w1_write_bit(dev, search_bit); | |
610 | ||
611 | } | |
612 | #endif | |
613 | ||
614 | if (desc_bit == last_zero) | |
615 | last_device = 1; | |
616 | ||
617 | desc_bit = last_zero; | |
618 | ||
619 | w1_slave_found(dev->bus_master->data, rn); | |
620 | } | |
621 | } | |
622 | ||
623 | int w1_create_master_attributes(struct w1_master *dev) | |
624 | { | |
625 | if ( device_create_file(&dev->dev, &w1_master_attribute_slaves) < 0 || | |
626 | device_create_file(&dev->dev, &w1_master_attribute_slave_count) < 0 || | |
627 | device_create_file(&dev->dev, &w1_master_attribute_attempts) < 0 || | |
628 | device_create_file(&dev->dev, &w1_master_attribute_max_slave_count) < 0 || | |
629 | device_create_file(&dev->dev, &w1_master_attribute_timeout) < 0|| | |
630 | device_create_file(&dev->dev, &w1_master_attribute_pointer) < 0|| | |
631 | device_create_file(&dev->dev, &w1_master_attribute_name) < 0) | |
632 | return -EINVAL; | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | void w1_destroy_master_attributes(struct w1_master *dev) | |
638 | { | |
639 | device_remove_file(&dev->dev, &w1_master_attribute_slaves); | |
640 | device_remove_file(&dev->dev, &w1_master_attribute_slave_count); | |
641 | device_remove_file(&dev->dev, &w1_master_attribute_attempts); | |
642 | device_remove_file(&dev->dev, &w1_master_attribute_max_slave_count); | |
643 | device_remove_file(&dev->dev, &w1_master_attribute_timeout); | |
644 | device_remove_file(&dev->dev, &w1_master_attribute_pointer); | |
645 | device_remove_file(&dev->dev, &w1_master_attribute_name); | |
646 | } | |
647 | ||
648 | ||
649 | int w1_control(void *data) | |
650 | { | |
651 | struct w1_slave *sl; | |
652 | struct w1_master *dev; | |
653 | struct list_head *ent, *ment, *n, *mn; | |
654 | int err, have_to_wait = 0; | |
655 | ||
656 | daemonize("w1_control"); | |
657 | allow_signal(SIGTERM); | |
658 | ||
659 | while (!control_needs_exit || have_to_wait) { | |
660 | have_to_wait = 0; | |
661 | ||
662 | try_to_freeze(PF_FREEZE); | |
663 | msleep_interruptible(w1_timeout * 1000); | |
664 | ||
665 | if (signal_pending(current)) | |
666 | flush_signals(current); | |
667 | ||
668 | list_for_each_safe(ment, mn, &w1_masters) { | |
669 | dev = list_entry(ment, struct w1_master, w1_master_entry); | |
670 | ||
671 | if (!control_needs_exit && !dev->need_exit) | |
672 | continue; | |
673 | /* | |
674 | * Little race: we can create thread but not set the flag. | |
675 | * Get a chance for external process to set flag up. | |
676 | */ | |
677 | if (!dev->initialized) { | |
678 | have_to_wait = 1; | |
679 | continue; | |
680 | } | |
681 | ||
682 | spin_lock(&w1_mlock); | |
683 | list_del(&dev->w1_master_entry); | |
684 | spin_unlock(&w1_mlock); | |
685 | ||
686 | if (control_needs_exit) { | |
687 | dev->need_exit = 1; | |
688 | ||
689 | err = kill_proc(dev->kpid, SIGTERM, 1); | |
690 | if (err) | |
691 | dev_err(&dev->dev, | |
692 | "Failed to send signal to w1 kernel thread %d.\n", | |
693 | dev->kpid); | |
694 | } | |
695 | ||
696 | wait_for_completion(&dev->dev_exited); | |
697 | ||
698 | list_for_each_safe(ent, n, &dev->slist) { | |
699 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
700 | ||
701 | if (!sl) | |
702 | dev_warn(&dev->dev, | |
703 | "%s: slave entry is NULL.\n", | |
704 | __func__); | |
705 | else { | |
706 | list_del(&sl->w1_slave_entry); | |
707 | ||
708 | w1_slave_detach(sl); | |
709 | kfree(sl); | |
710 | } | |
711 | } | |
712 | w1_destroy_master_attributes(dev); | |
713 | atomic_dec(&dev->refcnt); | |
714 | } | |
715 | } | |
716 | ||
717 | complete_and_exit(&w1_control_complete, 0); | |
718 | } | |
719 | ||
720 | int w1_process(void *data) | |
721 | { | |
722 | struct w1_master *dev = (struct w1_master *) data; | |
723 | struct list_head *ent, *n; | |
724 | struct w1_slave *sl; | |
725 | ||
726 | daemonize("%s", dev->name); | |
727 | allow_signal(SIGTERM); | |
728 | ||
729 | while (!dev->need_exit) { | |
730 | try_to_freeze(PF_FREEZE); | |
731 | msleep_interruptible(w1_timeout * 1000); | |
732 | ||
733 | if (signal_pending(current)) | |
734 | flush_signals(current); | |
735 | ||
736 | if (dev->need_exit) | |
737 | break; | |
738 | ||
739 | if (!dev->initialized) | |
740 | continue; | |
741 | ||
742 | if (down_interruptible(&dev->mutex)) | |
743 | continue; | |
744 | ||
745 | list_for_each_safe(ent, n, &dev->slist) { | |
746 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
747 | ||
748 | if (sl) | |
749 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
750 | } | |
751 | ||
752 | w1_search_devices(dev, w1_slave_found); | |
753 | ||
754 | list_for_each_safe(ent, n, &dev->slist) { | |
755 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
756 | ||
757 | if (sl && !test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
758 | list_del (&sl->w1_slave_entry); | |
759 | ||
760 | w1_slave_detach (sl); | |
761 | kfree (sl); | |
762 | ||
763 | dev->slave_count--; | |
764 | } | |
765 | else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) | |
766 | sl->ttl = dev->slave_ttl; | |
767 | } | |
768 | up(&dev->mutex); | |
769 | } | |
770 | ||
771 | atomic_dec(&dev->refcnt); | |
772 | complete_and_exit(&dev->dev_exited, 0); | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | int w1_init(void) | |
778 | { | |
779 | int retval; | |
780 | ||
781 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
782 | ||
783 | retval = bus_register(&w1_bus_type); | |
784 | if (retval) { | |
785 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
786 | goto err_out_exit_init; | |
787 | } | |
788 | ||
789 | retval = driver_register(&w1_driver); | |
790 | if (retval) { | |
791 | printk(KERN_ERR | |
792 | "Failed to register master driver. err=%d.\n", | |
793 | retval); | |
794 | goto err_out_bus_unregister; | |
795 | } | |
796 | ||
797 | control_thread = kernel_thread(&w1_control, NULL, 0); | |
798 | if (control_thread < 0) { | |
799 | printk(KERN_ERR "Failed to create control thread. err=%d\n", | |
800 | control_thread); | |
801 | retval = control_thread; | |
802 | goto err_out_driver_unregister; | |
803 | } | |
804 | ||
805 | return 0; | |
806 | ||
807 | err_out_driver_unregister: | |
808 | driver_unregister(&w1_driver); | |
809 | ||
810 | err_out_bus_unregister: | |
811 | bus_unregister(&w1_bus_type); | |
812 | ||
813 | err_out_exit_init: | |
814 | return retval; | |
815 | } | |
816 | ||
817 | void w1_fini(void) | |
818 | { | |
819 | struct w1_master *dev; | |
820 | struct list_head *ent, *n; | |
821 | ||
822 | list_for_each_safe(ent, n, &w1_masters) { | |
823 | dev = list_entry(ent, struct w1_master, w1_master_entry); | |
824 | __w1_remove_master_device(dev); | |
825 | } | |
826 | ||
827 | control_needs_exit = 1; | |
828 | ||
829 | wait_for_completion(&w1_control_complete); | |
830 | ||
831 | driver_unregister(&w1_driver); | |
832 | bus_unregister(&w1_bus_type); | |
833 | } | |
834 | ||
835 | module_init(w1_init); | |
836 | module_exit(w1_fini); |