1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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#include <linux/kthread.h>
34#include <linux/freezer.h>
35
36#include <asm/atomic.h>
37
38#include "w1.h"
39#include "w1_log.h"
40#include "w1_int.h"
41#include "w1_family.h"
42#include "w1_netlink.h"
43
44MODULE_LICENSE("GPL");
45MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
46MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
47
48static int w1_timeout = 10;
49int w1_max_slave_count = 10;
50int w1_max_slave_ttl = 10;
51
52module_param_named(timeout, w1_timeout, int, 0);
53module_param_named(max_slave_count, w1_max_slave_count, int, 0);
54module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
55
56DEFINE_MUTEX(w1_mlock);
57LIST_HEAD(w1_masters);
58
59static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
60
61static int w1_master_match(struct device *dev, struct device_driver *drv)
62{
63 return 1;
64}
65
66static int w1_master_probe(struct device *dev)
67{
68 return -ENODEV;
69}
70
71static void w1_master_release(struct device *dev)
72{
73 struct w1_master *md = dev_to_w1_master(dev);
74
75 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
76 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
77 kfree(md);
78}
79
80static void w1_slave_release(struct device *dev)
81{
82 struct w1_slave *sl = dev_to_w1_slave(dev);
83
84 dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
85
86 while (atomic_read(&sl->refcnt)) {
87 dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
88 sl->name, atomic_read(&sl->refcnt));
89 if (msleep_interruptible(1000))
90 flush_signals(current);
91 }
92
93 w1_family_put(sl->family);
94 sl->master->slave_count--;
95
96 complete(&sl->released);
97}
98
99static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
100{
101 struct w1_slave *sl = dev_to_w1_slave(dev);
102
103 return sprintf(buf, "%s\n", sl->name);
104}
105
106static ssize_t w1_slave_read_id(struct device *dev,
107 struct device_attribute *attr, char *buf)
108{
109 struct w1_slave *sl = dev_to_w1_slave(dev);
110 ssize_t count = sizeof(sl->reg_num);
111
112 memcpy(buf, (u8 *)&sl->reg_num, count);
113 return count;
114}
115
116static struct device_attribute w1_slave_attr_name =
117 __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
118static struct device_attribute w1_slave_attr_id =
119 __ATTR(id, S_IRUGO, w1_slave_read_id, NULL);
120
121
122
123static ssize_t w1_default_write(struct kobject *kobj,
124 struct bin_attribute *bin_attr,
125 char *buf, loff_t off, size_t count)
126{
127 struct w1_slave *sl = kobj_to_w1_slave(kobj);
128
129 mutex_lock(&sl->master->mutex);
130 if (w1_reset_select_slave(sl)) {
131 count = 0;
132 goto out_up;
133 }
134
135 w1_write_block(sl->master, buf, count);
136
137out_up:
138 mutex_unlock(&sl->master->mutex);
139 return count;
140}
141
142static ssize_t w1_default_read(struct kobject *kobj,
143 struct bin_attribute *bin_attr,
144 char *buf, loff_t off, size_t count)
145{
146 struct w1_slave *sl = kobj_to_w1_slave(kobj);
147
148 mutex_lock(&sl->master->mutex);
149 w1_read_block(sl->master, buf, count);
150 mutex_unlock(&sl->master->mutex);
151 return count;
152}
153
154static struct bin_attribute w1_default_attr = {
155 .attr = {
156 .name = "rw",
157 .mode = S_IRUGO | S_IWUSR,
158 },
159 .size = PAGE_SIZE,
160 .read = w1_default_read,
161 .write = w1_default_write,
162};
163
164static int w1_default_add_slave(struct w1_slave *sl)
165{
166 return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
167}
168
169static void w1_default_remove_slave(struct w1_slave *sl)
170{
171 sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
172}
173
174static struct w1_family_ops w1_default_fops = {
175 .add_slave = w1_default_add_slave,
176 .remove_slave = w1_default_remove_slave,
177};
178
179static struct w1_family w1_default_family = {
180 .fops = &w1_default_fops,
181};
182
183static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
184
185static struct bus_type w1_bus_type = {
186 .name = "w1",
187 .match = w1_master_match,
188 .uevent = w1_uevent,
189};
190
191struct device_driver w1_master_driver = {
192 .name = "w1_master_driver",
193 .bus = &w1_bus_type,
194 .probe = w1_master_probe,
195};
196
197struct device w1_master_device = {
198 .parent = NULL,
199 .bus = &w1_bus_type,
200 .init_name = "w1 bus master",
201 .driver = &w1_master_driver,
202 .release = &w1_master_release
203};
204
205static struct device_driver w1_slave_driver = {
206 .name = "w1_slave_driver",
207 .bus = &w1_bus_type,
208};
209
210#if 0
211struct device w1_slave_device = {
212 .parent = NULL,
213 .bus = &w1_bus_type,
214 .init_name = "w1 bus slave",
215 .driver = &w1_slave_driver,
216 .release = &w1_slave_release
217};
218#endif
219
220static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
221{
222 struct w1_master *md = dev_to_w1_master(dev);
223 ssize_t count;
224
225 mutex_lock(&md->mutex);
226 count = sprintf(buf, "%s\n", md->name);
227 mutex_unlock(&md->mutex);
228
229 return count;
230}
231
232static ssize_t w1_master_attribute_store_search(struct device * dev,
233 struct device_attribute *attr,
234 const char * buf, size_t count)
235{
236 long tmp;
237 struct w1_master *md = dev_to_w1_master(dev);
238
239 if (strict_strtol(buf, 0, &tmp) == -EINVAL)
240 return -EINVAL;
241
242 mutex_lock(&md->mutex);
243 md->search_count = tmp;
244 mutex_unlock(&md->mutex);
245 wake_up_process(md->thread);
246
247 return count;
248}
249
250static ssize_t w1_master_attribute_show_search(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253{
254 struct w1_master *md = dev_to_w1_master(dev);
255 ssize_t count;
256
257 mutex_lock(&md->mutex);
258 count = sprintf(buf, "%d\n", md->search_count);
259 mutex_unlock(&md->mutex);
260
261 return count;
262}
263
264static ssize_t w1_master_attribute_store_pullup(struct device *dev,
265 struct device_attribute *attr,
266 const char *buf, size_t count)
267{
268 long tmp;
269 struct w1_master *md = dev_to_w1_master(dev);
270
271 if (strict_strtol(buf, 0, &tmp) == -EINVAL)
272 return -EINVAL;
273
274 mutex_lock(&md->mutex);
275 md->enable_pullup = tmp;
276 mutex_unlock(&md->mutex);
277 wake_up_process(md->thread);
278
279 return count;
280}
281
282static ssize_t w1_master_attribute_show_pullup(struct device *dev,
283 struct device_attribute *attr,
284 char *buf)
285{
286 struct w1_master *md = dev_to_w1_master(dev);
287 ssize_t count;
288
289 mutex_lock(&md->mutex);
290 count = sprintf(buf, "%d\n", md->enable_pullup);
291 mutex_unlock(&md->mutex);
292
293 return count;
294}
295
296static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
297{
298 struct w1_master *md = dev_to_w1_master(dev);
299 ssize_t count;
300
301 mutex_lock(&md->mutex);
302 count = sprintf(buf, "0x%p\n", md->bus_master);
303 mutex_unlock(&md->mutex);
304 return count;
305}
306
307static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
308{
309 ssize_t count;
310 count = sprintf(buf, "%d\n", w1_timeout);
311 return count;
312}
313
314static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
315{
316 struct w1_master *md = dev_to_w1_master(dev);
317 ssize_t count;
318
319 mutex_lock(&md->mutex);
320 count = sprintf(buf, "%d\n", md->max_slave_count);
321 mutex_unlock(&md->mutex);
322 return count;
323}
324
325static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
326{
327 struct w1_master *md = dev_to_w1_master(dev);
328 ssize_t count;
329
330 mutex_lock(&md->mutex);
331 count = sprintf(buf, "%lu\n", md->attempts);
332 mutex_unlock(&md->mutex);
333 return count;
334}
335
336static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
337{
338 struct w1_master *md = dev_to_w1_master(dev);
339 ssize_t count;
340
341 mutex_lock(&md->mutex);
342 count = sprintf(buf, "%d\n", md->slave_count);
343 mutex_unlock(&md->mutex);
344 return count;
345}
346
347static ssize_t w1_master_attribute_show_slaves(struct device *dev,
348 struct device_attribute *attr, char *buf)
349{
350 struct w1_master *md = dev_to_w1_master(dev);
351 int c = PAGE_SIZE;
352
353 mutex_lock(&md->mutex);
354
355 if (md->slave_count == 0)
356 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
357 else {
358 struct list_head *ent, *n;
359 struct w1_slave *sl;
360
361 list_for_each_safe(ent, n, &md->slist) {
362 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
363
364 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
365 }
366 }
367
368 mutex_unlock(&md->mutex);
369
370 return PAGE_SIZE - c;
371}
372
373static ssize_t w1_master_attribute_show_add(struct device *dev,
374 struct device_attribute *attr, char *buf)
375{
376 int c = PAGE_SIZE;
377 c -= snprintf(buf+PAGE_SIZE - c, c,
378 "write device id xx-xxxxxxxxxxxx to add slave\n");
379 return PAGE_SIZE - c;
380}
381
382static int w1_atoreg_num(struct device *dev, const char *buf, size_t count,
383 struct w1_reg_num *rn)
384{
385 unsigned int family;
386 unsigned long long id;
387 int i;
388 u64 rn64_le;
389
390
391
392
393
394
395 const char *error_msg = "bad slave string format, expecting "
396 "ff-dddddddddddd\n";
397
398 if (buf[2] != '-') {
399 dev_err(dev, "%s", error_msg);
400 return -EINVAL;
401 }
402 i = sscanf(buf, "%02x-%012llx", &family, &id);
403 if (i != 2) {
404 dev_err(dev, "%s", error_msg);
405 return -EINVAL;
406 }
407 rn->family = family;
408 rn->id = id;
409
410 rn64_le = cpu_to_le64(*(u64 *)rn);
411 rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7);
412
413#if 0
414 dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n",
415 rn->family, (unsigned long long)rn->id, rn->crc);
416#endif
417
418 return 0;
419}
420
421
422
423
424static struct w1_slave *w1_slave_search_device(struct w1_master *dev,
425 struct w1_reg_num *rn)
426{
427 struct w1_slave *sl;
428 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
429 if (sl->reg_num.family == rn->family &&
430 sl->reg_num.id == rn->id &&
431 sl->reg_num.crc == rn->crc) {
432 return sl;
433 }
434 }
435 return NULL;
436}
437
438static ssize_t w1_master_attribute_store_add(struct device *dev,
439 struct device_attribute *attr,
440 const char *buf, size_t count)
441{
442 struct w1_master *md = dev_to_w1_master(dev);
443 struct w1_reg_num rn;
444 struct w1_slave *sl;
445 ssize_t result = count;
446
447 if (w1_atoreg_num(dev, buf, count, &rn))
448 return -EINVAL;
449
450 mutex_lock(&md->mutex);
451 sl = w1_slave_search_device(md, &rn);
452
453
454
455
456 if (sl) {
457 dev_info(dev, "Device %s already exists\n", sl->name);
458 result = -EINVAL;
459 } else {
460 w1_attach_slave_device(md, &rn);
461 }
462 mutex_unlock(&md->mutex);
463
464 return result;
465}
466
467static ssize_t w1_master_attribute_show_remove(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 int c = PAGE_SIZE;
471 c -= snprintf(buf+PAGE_SIZE - c, c,
472 "write device id xx-xxxxxxxxxxxx to remove slave\n");
473 return PAGE_SIZE - c;
474}
475
476static ssize_t w1_master_attribute_store_remove(struct device *dev,
477 struct device_attribute *attr,
478 const char *buf, size_t count)
479{
480 struct w1_master *md = dev_to_w1_master(dev);
481 struct w1_reg_num rn;
482 struct w1_slave *sl;
483 ssize_t result = count;
484
485 if (w1_atoreg_num(dev, buf, count, &rn))
486 return -EINVAL;
487
488 mutex_lock(&md->mutex);
489 sl = w1_slave_search_device(md, &rn);
490 if (sl) {
491 w1_slave_detach(sl);
492 } else {
493 dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family,
494 (unsigned long long)rn.id);
495 result = -EINVAL;
496 }
497 mutex_unlock(&md->mutex);
498
499 return result;
500}
501
502#define W1_MASTER_ATTR_RO(_name, _mode) \
503 struct device_attribute w1_master_attribute_##_name = \
504 __ATTR(w1_master_##_name, _mode, \
505 w1_master_attribute_show_##_name, NULL)
506
507#define W1_MASTER_ATTR_RW(_name, _mode) \
508 struct device_attribute w1_master_attribute_##_name = \
509 __ATTR(w1_master_##_name, _mode, \
510 w1_master_attribute_show_##_name, \
511 w1_master_attribute_store_##_name)
512
513static W1_MASTER_ATTR_RO(name, S_IRUGO);
514static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
515static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
516static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
517static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
518static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
519static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
520static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
521static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO);
522static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUGO);
523static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUGO);
524
525static struct attribute *w1_master_default_attrs[] = {
526 &w1_master_attribute_name.attr,
527 &w1_master_attribute_slaves.attr,
528 &w1_master_attribute_slave_count.attr,
529 &w1_master_attribute_max_slave_count.attr,
530 &w1_master_attribute_attempts.attr,
531 &w1_master_attribute_timeout.attr,
532 &w1_master_attribute_pointer.attr,
533 &w1_master_attribute_search.attr,
534 &w1_master_attribute_pullup.attr,
535 &w1_master_attribute_add.attr,
536 &w1_master_attribute_remove.attr,
537 NULL
538};
539
540static struct attribute_group w1_master_defattr_group = {
541 .attrs = w1_master_default_attrs,
542};
543
544int w1_create_master_attributes(struct w1_master *master)
545{
546 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
547}
548
549void w1_destroy_master_attributes(struct w1_master *master)
550{
551 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
552}
553
554#ifdef CONFIG_HOTPLUG
555static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
556{
557 struct w1_master *md = NULL;
558 struct w1_slave *sl = NULL;
559 char *event_owner, *name;
560 int err;
561
562 if (dev->driver == &w1_master_driver) {
563 md = container_of(dev, struct w1_master, dev);
564 event_owner = "master";
565 name = md->name;
566 } else if (dev->driver == &w1_slave_driver) {
567 sl = container_of(dev, struct w1_slave, dev);
568 event_owner = "slave";
569 name = sl->name;
570 } else {
571 dev_dbg(dev, "Unknown event.\n");
572 return -EINVAL;
573 }
574
575 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
576 event_owner, name, dev_name(dev));
577
578 if (dev->driver != &w1_slave_driver || !sl)
579 return 0;
580
581 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
582 if (err)
583 return err;
584
585 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
586 (unsigned long long)sl->reg_num.id);
587 if (err)
588 return err;
589
590 return 0;
591};
592#else
593static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
594{
595 return 0;
596}
597#endif
598
599static int __w1_attach_slave_device(struct w1_slave *sl)
600{
601 int err;
602
603 sl->dev.parent = &sl->master->dev;
604 sl->dev.driver = &w1_slave_driver;
605 sl->dev.bus = &w1_bus_type;
606 sl->dev.release = &w1_slave_release;
607
608 dev_set_name(&sl->dev, "%02x-%012llx",
609 (unsigned int) sl->reg_num.family,
610 (unsigned long long) sl->reg_num.id);
611 snprintf(&sl->name[0], sizeof(sl->name),
612 "%02x-%012llx",
613 (unsigned int) sl->reg_num.family,
614 (unsigned long long) sl->reg_num.id);
615
616 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
617 dev_name(&sl->dev), sl);
618
619 err = device_register(&sl->dev);
620 if (err < 0) {
621 dev_err(&sl->dev,
622 "Device registration [%s] failed. err=%d\n",
623 dev_name(&sl->dev), err);
624 return err;
625 }
626
627
628 err = device_create_file(&sl->dev, &w1_slave_attr_name);
629 if (err < 0) {
630 dev_err(&sl->dev,
631 "sysfs file creation for [%s] failed. err=%d\n",
632 dev_name(&sl->dev), err);
633 goto out_unreg;
634 }
635
636
637 err = device_create_file(&sl->dev, &w1_slave_attr_id);
638 if (err < 0) {
639 dev_err(&sl->dev,
640 "sysfs file creation for [%s] failed. err=%d\n",
641 dev_name(&sl->dev), err);
642 goto out_rem1;
643 }
644
645
646 if (sl->family->fops && sl->family->fops->add_slave &&
647 ((err = sl->family->fops->add_slave(sl)) < 0)) {
648 dev_err(&sl->dev,
649 "sysfs file creation for [%s] failed. err=%d\n",
650 dev_name(&sl->dev), err);
651 goto out_rem2;
652 }
653
654 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
655
656 return 0;
657
658out_rem2:
659 device_remove_file(&sl->dev, &w1_slave_attr_id);
660out_rem1:
661 device_remove_file(&sl->dev, &w1_slave_attr_name);
662out_unreg:
663 device_unregister(&sl->dev);
664 return err;
665}
666
667static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
668{
669 struct w1_slave *sl;
670 struct w1_family *f;
671 int err;
672 struct w1_netlink_msg msg;
673
674 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
675 if (!sl) {
676 dev_err(&dev->dev,
677 "%s: failed to allocate new slave device.\n",
678 __func__);
679 return -ENOMEM;
680 }
681
682
683 sl->owner = THIS_MODULE;
684 sl->master = dev;
685 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
686
687 memset(&msg, 0, sizeof(msg));
688 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
689 atomic_set(&sl->refcnt, 0);
690 init_completion(&sl->released);
691
692 spin_lock(&w1_flock);
693 f = w1_family_registered(rn->family);
694 if (!f) {
695 f= &w1_default_family;
696 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
697 rn->family, rn->family,
698 (unsigned long long)rn->id, rn->crc);
699 }
700 __w1_family_get(f);
701 spin_unlock(&w1_flock);
702
703 sl->family = f;
704
705
706 err = __w1_attach_slave_device(sl);
707 if (err < 0) {
708 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
709 sl->name);
710 w1_family_put(sl->family);
711 kfree(sl);
712 return err;
713 }
714
715 sl->ttl = dev->slave_ttl;
716 dev->slave_count++;
717
718 memcpy(msg.id.id, rn, sizeof(msg.id));
719 msg.type = W1_SLAVE_ADD;
720 w1_netlink_send(dev, &msg);
721
722 return 0;
723}
724
725void w1_slave_detach(struct w1_slave *sl)
726{
727 struct w1_netlink_msg msg;
728
729 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
730
731 list_del(&sl->w1_slave_entry);
732
733 if (sl->family->fops && sl->family->fops->remove_slave)
734 sl->family->fops->remove_slave(sl);
735
736 memset(&msg, 0, sizeof(msg));
737 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
738 msg.type = W1_SLAVE_REMOVE;
739 w1_netlink_send(sl->master, &msg);
740
741 device_remove_file(&sl->dev, &w1_slave_attr_id);
742 device_remove_file(&sl->dev, &w1_slave_attr_name);
743 device_unregister(&sl->dev);
744
745 wait_for_completion(&sl->released);
746 kfree(sl);
747}
748
749struct w1_master *w1_search_master_id(u32 id)
750{
751 struct w1_master *dev;
752 int found = 0;
753
754 mutex_lock(&w1_mlock);
755 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
756 if (dev->id == id) {
757 found = 1;
758 atomic_inc(&dev->refcnt);
759 break;
760 }
761 }
762 mutex_unlock(&w1_mlock);
763
764 return (found)?dev:NULL;
765}
766
767struct w1_slave *w1_search_slave(struct w1_reg_num *id)
768{
769 struct w1_master *dev;
770 struct w1_slave *sl = NULL;
771 int found = 0;
772
773 mutex_lock(&w1_mlock);
774 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
775 mutex_lock(&dev->mutex);
776 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
777 if (sl->reg_num.family == id->family &&
778 sl->reg_num.id == id->id &&
779 sl->reg_num.crc == id->crc) {
780 found = 1;
781 atomic_inc(&dev->refcnt);
782 atomic_inc(&sl->refcnt);
783 break;
784 }
785 }
786 mutex_unlock(&dev->mutex);
787
788 if (found)
789 break;
790 }
791 mutex_unlock(&w1_mlock);
792
793 return (found)?sl:NULL;
794}
795
796void w1_reconnect_slaves(struct w1_family *f, int attach)
797{
798 struct w1_slave *sl, *sln;
799 struct w1_master *dev;
800
801 mutex_lock(&w1_mlock);
802 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
803 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
804 "for family %02x.\n", dev->name, f->fid);
805 mutex_lock(&dev->mutex);
806 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
807
808
809
810
811
812 if ((attach && sl->family->fid == W1_FAMILY_DEFAULT
813 && sl->reg_num.family == f->fid) ||
814 (!attach && sl->family->fid == f->fid)) {
815 struct w1_reg_num rn;
816
817 memcpy(&rn, &sl->reg_num, sizeof(rn));
818 w1_slave_detach(sl);
819
820 w1_attach_slave_device(dev, &rn);
821 }
822 }
823 dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
824 "has been finished.\n", dev->name);
825 mutex_unlock(&dev->mutex);
826 }
827 mutex_unlock(&w1_mlock);
828}
829
830static void w1_slave_found(struct w1_master *dev, u64 rn)
831{
832 struct w1_slave *sl;
833 struct w1_reg_num *tmp;
834 u64 rn_le = cpu_to_le64(rn);
835
836 atomic_inc(&dev->refcnt);
837
838 tmp = (struct w1_reg_num *) &rn;
839
840 sl = w1_slave_search_device(dev, tmp);
841 if (sl) {
842 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
843 } else {
844 if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7))
845 w1_attach_slave_device(dev, tmp);
846 }
847
848 atomic_dec(&dev->refcnt);
849}
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
866{
867 u64 last_rn, rn, tmp64;
868 int i, slave_count = 0;
869 int last_zero, last_device;
870 int search_bit, desc_bit;
871 u8 triplet_ret = 0;
872
873 search_bit = 0;
874 rn = last_rn = 0;
875 last_device = 0;
876 last_zero = -1;
877
878 desc_bit = 64;
879
880 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
881 last_rn = rn;
882 rn = 0;
883
884
885
886
887
888
889
890 if (w1_reset_bus(dev)) {
891 dev_dbg(&dev->dev, "No devices present on the wire.\n");
892 break;
893 }
894
895
896 w1_write_8(dev, search_type);
897 for (i = 0; i < 64; ++i) {
898
899 if (i == desc_bit)
900 search_bit = 1;
901 else if (i > desc_bit)
902 search_bit = 0;
903 else
904 search_bit = ((last_rn >> i) & 0x1);
905
906
907 triplet_ret = w1_triplet(dev, search_bit);
908
909
910 if ( (triplet_ret & 0x03) == 0x03 )
911 break;
912
913
914 if (triplet_ret == 0)
915 last_zero = i;
916
917
918 tmp64 = (triplet_ret >> 2);
919 rn |= (tmp64 << i);
920
921 if (kthread_should_stop()) {
922 dev_dbg(&dev->dev, "Abort w1_search\n");
923 return;
924 }
925 }
926
927 if ( (triplet_ret & 0x03) != 0x03 ) {
928 if ( (desc_bit == last_zero) || (last_zero < 0))
929 last_device = 1;
930 desc_bit = last_zero;
931 cb(dev, rn);
932 }
933 }
934}
935
936void w1_search_process(struct w1_master *dev, u8 search_type)
937{
938 struct w1_slave *sl, *sln;
939
940 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
941 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
942
943 w1_search_devices(dev, search_type, w1_slave_found);
944
945 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
946 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
947 w1_slave_detach(sl);
948 else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
949 sl->ttl = dev->slave_ttl;
950 }
951
952 if (dev->search_count > 0)
953 dev->search_count--;
954}
955
956int w1_process(void *data)
957{
958 struct w1_master *dev = (struct w1_master *) data;
959
960
961
962 const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
963
964 while (!kthread_should_stop()) {
965 if (dev->search_count) {
966 mutex_lock(&dev->mutex);
967 w1_search_process(dev, W1_SEARCH);
968 mutex_unlock(&dev->mutex);
969 }
970
971 try_to_freeze();
972 __set_current_state(TASK_INTERRUPTIBLE);
973
974 if (kthread_should_stop())
975 break;
976
977
978 if (dev->search_count)
979 schedule_timeout(jtime);
980 else
981 schedule();
982 }
983
984 atomic_dec(&dev->refcnt);
985
986 return 0;
987}
988
989static int w1_init(void)
990{
991 int retval;
992
993 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
994
995 w1_init_netlink();
996
997 retval = bus_register(&w1_bus_type);
998 if (retval) {
999 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
1000 goto err_out_exit_init;
1001 }
1002
1003 retval = driver_register(&w1_master_driver);
1004 if (retval) {
1005 printk(KERN_ERR
1006 "Failed to register master driver. err=%d.\n",
1007 retval);
1008 goto err_out_bus_unregister;
1009 }
1010
1011 retval = driver_register(&w1_slave_driver);
1012 if (retval) {
1013 printk(KERN_ERR
1014 "Failed to register master driver. err=%d.\n",
1015 retval);
1016 goto err_out_master_unregister;
1017 }
1018
1019 return 0;
1020
1021#if 0
1022
1023err_out_slave_unregister:
1024 driver_unregister(&w1_slave_driver);
1025#endif
1026
1027err_out_master_unregister:
1028 driver_unregister(&w1_master_driver);
1029
1030err_out_bus_unregister:
1031 bus_unregister(&w1_bus_type);
1032
1033err_out_exit_init:
1034 return retval;
1035}
1036
1037static void w1_fini(void)
1038{
1039 struct w1_master *dev;
1040
1041
1042 list_for_each_entry(dev, &w1_masters, w1_master_entry)
1043 __w1_remove_master_device(dev);
1044
1045 w1_fini_netlink();
1046
1047 driver_unregister(&w1_slave_driver);
1048 driver_unregister(&w1_master_driver);
1049 bus_unregister(&w1_bus_type);
1050}
1051
1052module_init(w1_init);
1053module_exit(w1_fini);
1054