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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;
49static int w1_control_timeout = 1;
50int w1_max_slave_count = 10;
51int w1_max_slave_ttl = 10;
52
53module_param_named(timeout, w1_timeout, int, 0);
54module_param_named(control_timeout, w1_control_timeout, int, 0);
55module_param_named(max_slave_count, w1_max_slave_count, int, 0);
56module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
57
58DEFINE_MUTEX(w1_mlock);
59LIST_HEAD(w1_masters);
60
61static struct task_struct *w1_control_thread;
62
63static int w1_master_match(struct device *dev, struct device_driver *drv)
64{
65 return 1;
66}
67
68static int w1_master_probe(struct device *dev)
69{
70 return -ENODEV;
71}
72
73static void w1_master_release(struct device *dev)
74{
75 struct w1_master *md = dev_to_w1_master(dev);
76
77 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
78 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
79 kfree(md);
80}
81
82static void w1_slave_release(struct device *dev)
83{
84 struct w1_slave *sl = dev_to_w1_slave(dev);
85
86 printk("%s: Releasing %s.\n", __func__, sl->name);
87
88 while (atomic_read(&sl->refcnt)) {
89 printk("Waiting for %s to become free: refcnt=%d.\n",
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);
99}
100
101static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
102{
103 struct w1_slave *sl = dev_to_w1_slave(dev);
104
105 return sprintf(buf, "%s\n", sl->name);
106}
107
108static ssize_t w1_slave_read_id(struct kobject *kobj,
109 struct bin_attribute *bin_attr,
110 char *buf, loff_t off, size_t count)
111{
112 struct w1_slave *sl = kobj_to_w1_slave(kobj);
113
114 if (off > 8) {
115 count = 0;
116 } else {
117 if (off + count > 8)
118 count = 8 - off;
119
120 memcpy(buf, (u8 *)&sl->reg_num, count);
121 }
122
123 return count;
124}
125
126static struct device_attribute w1_slave_attr_name =
127 __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
128
129static struct bin_attribute w1_slave_attr_bin_id = {
130 .attr = {
131 .name = "id",
132 .mode = S_IRUGO,
133 },
134 .size = 8,
135 .read = w1_slave_read_id,
136};
137
138
139
140static ssize_t w1_default_write(struct kobject *kobj,
141 struct bin_attribute *bin_attr,
142 char *buf, loff_t off, size_t count)
143{
144 struct w1_slave *sl = kobj_to_w1_slave(kobj);
145
146 mutex_lock(&sl->master->mutex);
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
154out_up:
155 mutex_unlock(&sl->master->mutex);
156 return count;
157}
158
159static ssize_t w1_default_read(struct kobject *kobj,
160 struct bin_attribute *bin_attr,
161 char *buf, loff_t off, size_t count)
162{
163 struct w1_slave *sl = kobj_to_w1_slave(kobj);
164
165 mutex_lock(&sl->master->mutex);
166 w1_read_block(sl->master, buf, count);
167 mutex_unlock(&sl->master->mutex);
168 return count;
169}
170
171static struct bin_attribute w1_default_attr = {
172 .attr = {
173 .name = "rw",
174 .mode = S_IRUGO | S_IWUSR,
175 },
176 .size = PAGE_SIZE,
177 .read = w1_default_read,
178 .write = w1_default_write,
179};
180
181static int w1_default_add_slave(struct w1_slave *sl)
182{
183 return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
184}
185
186static void w1_default_remove_slave(struct w1_slave *sl)
187{
188 sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
189}
190
191static struct w1_family_ops w1_default_fops = {
192 .add_slave = w1_default_add_slave,
193 .remove_slave = w1_default_remove_slave,
194};
195
196static struct w1_family w1_default_family = {
197 .fops = &w1_default_fops,
198};
199
200static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
201
202static struct bus_type w1_bus_type = {
203 .name = "w1",
204 .match = w1_master_match,
205 .uevent = w1_uevent,
206};
207
208struct device_driver w1_master_driver = {
209 .name = "w1_master_driver",
210 .bus = &w1_bus_type,
211 .probe = w1_master_probe,
212};
213
214struct device w1_master_device = {
215 .parent = NULL,
216 .bus = &w1_bus_type,
217 .bus_id = "w1 bus master",
218 .driver = &w1_master_driver,
219 .release = &w1_master_release
220};
221
222static struct device_driver w1_slave_driver = {
223 .name = "w1_slave_driver",
224 .bus = &w1_bus_type,
225};
226
227#if 0
228struct device w1_slave_device = {
229 .parent = NULL,
230 .bus = &w1_bus_type,
231 .bus_id = "w1 bus slave",
232 .driver = &w1_slave_driver,
233 .release = &w1_slave_release
234};
235#endif
236
237static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
238{
239 struct w1_master *md = dev_to_w1_master(dev);
240 ssize_t count;
241
242 mutex_lock(&md->mutex);
243 count = sprintf(buf, "%s\n", md->name);
244 mutex_unlock(&md->mutex);
245
246 return count;
247}
248
249static ssize_t w1_master_attribute_store_search(struct device * dev,
250 struct device_attribute *attr,
251 const char * buf, size_t count)
252{
253 struct w1_master *md = dev_to_w1_master(dev);
254
255 mutex_lock(&md->mutex);
256 md->search_count = simple_strtol(buf, NULL, 0);
257 mutex_unlock(&md->mutex);
258
259 return count;
260}
261
262static ssize_t w1_master_attribute_show_search(struct device *dev,
263 struct device_attribute *attr,
264 char *buf)
265{
266 struct w1_master *md = dev_to_w1_master(dev);
267 ssize_t count;
268
269 mutex_lock(&md->mutex);
270 count = sprintf(buf, "%d\n", md->search_count);
271 mutex_unlock(&md->mutex);
272
273 return count;
274}
275
276static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
277{
278 struct w1_master *md = dev_to_w1_master(dev);
279 ssize_t count;
280
281 mutex_lock(&md->mutex);
282 count = sprintf(buf, "0x%p\n", md->bus_master);
283 mutex_unlock(&md->mutex);
284 return count;
285}
286
287static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
288{
289 ssize_t count;
290 count = sprintf(buf, "%d\n", w1_timeout);
291 return count;
292}
293
294static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
295{
296 struct w1_master *md = dev_to_w1_master(dev);
297 ssize_t count;
298
299 mutex_lock(&md->mutex);
300 count = sprintf(buf, "%d\n", md->max_slave_count);
301 mutex_unlock(&md->mutex);
302 return count;
303}
304
305static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
306{
307 struct w1_master *md = dev_to_w1_master(dev);
308 ssize_t count;
309
310 mutex_lock(&md->mutex);
311 count = sprintf(buf, "%lu\n", md->attempts);
312 mutex_unlock(&md->mutex);
313 return count;
314}
315
316static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
317{
318 struct w1_master *md = dev_to_w1_master(dev);
319 ssize_t count;
320
321 mutex_lock(&md->mutex);
322 count = sprintf(buf, "%d\n", md->slave_count);
323 mutex_unlock(&md->mutex);
324 return count;
325}
326
327static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
328{
329 struct w1_master *md = dev_to_w1_master(dev);
330 int c = PAGE_SIZE;
331
332 mutex_lock(&md->mutex);
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
343 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
344 }
345 }
346
347 mutex_unlock(&md->mutex);
348
349 return PAGE_SIZE - c;
350}
351
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
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
363static W1_MASTER_ATTR_RO(name, S_IRUGO);
364static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
365static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
366static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
367static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
368static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
369static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
370static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
371
372static 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,
380 &w1_master_attribute_search.attr,
381 NULL
382};
383
384static struct attribute_group w1_master_defattr_group = {
385 .attrs = w1_master_default_attrs,
386};
387
388int w1_create_master_attributes(struct w1_master *master)
389{
390 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
391}
392
393static void w1_destroy_master_attributes(struct w1_master *master)
394{
395 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
396}
397
398#ifdef CONFIG_HOTPLUG
399static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
400{
401 struct w1_master *md = NULL;
402 struct w1_slave *sl = NULL;
403 char *event_owner, *name;
404 int err;
405
406 if (dev->driver == &w1_master_driver) {
407 md = container_of(dev, struct w1_master, dev);
408 event_owner = "master";
409 name = md->name;
410 } else if (dev->driver == &w1_slave_driver) {
411 sl = container_of(dev, struct w1_slave, dev);
412 event_owner = "slave";
413 name = sl->name;
414 } else {
415 dev_dbg(dev, "Unknown event.\n");
416 return -EINVAL;
417 }
418
419 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
420 event_owner, name, dev->bus_id);
421
422 if (dev->driver != &w1_slave_driver || !sl)
423 return 0;
424
425 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
426 if (err)
427 return err;
428
429 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
430 (unsigned long long)sl->reg_num.id);
431 if (err)
432 return err;
433
434 return 0;
435};
436#else
437static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
438{
439 return 0;
440}
441#endif
442
443static int __w1_attach_slave_device(struct w1_slave *sl)
444{
445 int err;
446
447 sl->dev.parent = &sl->master->dev;
448 sl->dev.driver = &w1_slave_driver;
449 sl->dev.bus = &w1_bus_type;
450 sl->dev.release = &w1_slave_release;
451
452 snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
453 "%02x-%012llx",
454 (unsigned int) sl->reg_num.family,
455 (unsigned long long) sl->reg_num.id);
456 snprintf(&sl->name[0], sizeof(sl->name),
457 "%02x-%012llx",
458 (unsigned int) sl->reg_num.family,
459 (unsigned long long) sl->reg_num.id);
460
461 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
462 &sl->dev.bus_id[0], sl);
463
464 err = device_register(&sl->dev);
465 if (err < 0) {
466 dev_err(&sl->dev,
467 "Device registration [%s] failed. err=%d\n",
468 sl->dev.bus_id, err);
469 return err;
470 }
471
472
473 err = device_create_file(&sl->dev, &w1_slave_attr_name);
474 if (err < 0) {
475 dev_err(&sl->dev,
476 "sysfs file creation for [%s] failed. err=%d\n",
477 sl->dev.bus_id, err);
478 goto out_unreg;
479 }
480
481
482 err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
483 if (err < 0) {
484 dev_err(&sl->dev,
485 "sysfs file creation for [%s] failed. err=%d\n",
486 sl->dev.bus_id, err);
487 goto out_rem1;
488 }
489
490
491 if (sl->family->fops && sl->family->fops->add_slave &&
492 ((err = sl->family->fops->add_slave(sl)) < 0)) {
493 dev_err(&sl->dev,
494 "sysfs file creation for [%s] failed. err=%d\n",
495 sl->dev.bus_id, err);
496 goto out_rem2;
497 }
498
499 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
500
501 return 0;
502
503out_rem2:
504 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
505out_rem1:
506 device_remove_file(&sl->dev, &w1_slave_attr_name);
507out_unreg:
508 device_unregister(&sl->dev);
509 return err;
510}
511
512static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
513{
514 struct w1_slave *sl;
515 struct w1_family *f;
516 int err;
517 struct w1_netlink_msg msg;
518
519 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
520 if (!sl) {
521 dev_err(&dev->dev,
522 "%s: failed to allocate new slave device.\n",
523 __func__);
524 return -ENOMEM;
525 }
526
527
528 sl->owner = THIS_MODULE;
529 sl->master = dev;
530 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
531
532 memset(&msg, 0, sizeof(msg));
533 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
534 atomic_set(&sl->refcnt, 0);
535 init_completion(&sl->released);
536
537 spin_lock(&w1_flock);
538 f = w1_family_registered(rn->family);
539 if (!f) {
540 f= &w1_default_family;
541 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
542 rn->family, rn->family,
543 (unsigned long long)rn->id, rn->crc);
544 }
545 __w1_family_get(f);
546 spin_unlock(&w1_flock);
547
548 sl->family = f;
549
550
551 err = __w1_attach_slave_device(sl);
552 if (err < 0) {
553 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
554 sl->name);
555 w1_family_put(sl->family);
556 kfree(sl);
557 return err;
558 }
559
560 sl->ttl = dev->slave_ttl;
561 dev->slave_count++;
562
563 memcpy(msg.id.id, rn, sizeof(msg.id));
564 msg.type = W1_SLAVE_ADD;
565 w1_netlink_send(dev, &msg);
566
567 return 0;
568}
569
570static void w1_slave_detach(struct w1_slave *sl)
571{
572 struct w1_netlink_msg msg;
573
574 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
575
576 list_del(&sl->w1_slave_entry);
577
578 if (sl->family->fops && sl->family->fops->remove_slave)
579 sl->family->fops->remove_slave(sl);
580
581 memset(&msg, 0, sizeof(msg));
582 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
583 msg.type = W1_SLAVE_REMOVE;
584 w1_netlink_send(sl->master, &msg);
585
586 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
587 device_remove_file(&sl->dev, &w1_slave_attr_name);
588 device_unregister(&sl->dev);
589
590 wait_for_completion(&sl->released);
591 kfree(sl);
592}
593
594static struct w1_master *w1_search_master(void *data)
595{
596 struct w1_master *dev;
597 int found = 0;
598
599 mutex_lock(&w1_mlock);
600 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
601 if (dev->bus_master->data == data) {
602 found = 1;
603 atomic_inc(&dev->refcnt);
604 break;
605 }
606 }
607 mutex_unlock(&w1_mlock);
608
609 return (found)?dev:NULL;
610}
611
612struct w1_master *w1_search_master_id(u32 id)
613{
614 struct w1_master *dev;
615 int found = 0;
616
617 mutex_lock(&w1_mlock);
618 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
619 if (dev->id == id) {
620 found = 1;
621 atomic_inc(&dev->refcnt);
622 break;
623 }
624 }
625 mutex_unlock(&w1_mlock);
626
627 return (found)?dev:NULL;
628}
629
630struct w1_slave *w1_search_slave(struct w1_reg_num *id)
631{
632 struct w1_master *dev;
633 struct w1_slave *sl = NULL;
634 int found = 0;
635
636 mutex_lock(&w1_mlock);
637 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
638 mutex_lock(&dev->mutex);
639 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
640 if (sl->reg_num.family == id->family &&
641 sl->reg_num.id == id->id &&
642 sl->reg_num.crc == id->crc) {
643 found = 1;
644 atomic_inc(&dev->refcnt);
645 atomic_inc(&sl->refcnt);
646 break;
647 }
648 }
649 mutex_unlock(&dev->mutex);
650
651 if (found)
652 break;
653 }
654 mutex_unlock(&w1_mlock);
655
656 return (found)?sl:NULL;
657}
658
659void w1_reconnect_slaves(struct w1_family *f)
660{
661 struct w1_master *dev;
662
663 mutex_lock(&w1_mlock);
664 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
665 dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
666 dev->name, f->fid);
667 set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
668 }
669 mutex_unlock(&w1_mlock);
670}
671
672static void w1_slave_found(void *data, u64 rn)
673{
674 int slave_count;
675 struct w1_slave *sl;
676 struct list_head *ent;
677 struct w1_reg_num *tmp;
678 struct w1_master *dev;
679 u64 rn_le = cpu_to_le64(rn);
680
681 dev = w1_search_master(data);
682 if (!dev) {
683 printk(KERN_ERR "Failed to find w1 master device for data %p, "
684 "it is impossible.\n", data);
685 return;
686 }
687
688 tmp = (struct w1_reg_num *) &rn;
689
690 slave_count = 0;
691 list_for_each(ent, &dev->slist) {
692
693 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
694
695 if (sl->reg_num.family == tmp->family &&
696 sl->reg_num.id == tmp->id &&
697 sl->reg_num.crc == tmp->crc) {
698 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
699 break;
700 }
701
702 slave_count++;
703 }
704
705 if (slave_count == dev->slave_count &&
706 rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
707 w1_attach_slave_device(dev, tmp);
708 }
709
710 atomic_dec(&dev->refcnt);
711}
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
728{
729 u64 last_rn, rn, tmp64;
730 int i, slave_count = 0;
731 int last_zero, last_device;
732 int search_bit, desc_bit;
733 u8 triplet_ret = 0;
734
735 search_bit = 0;
736 rn = last_rn = 0;
737 last_device = 0;
738 last_zero = -1;
739
740 desc_bit = 64;
741
742 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
743 last_rn = rn;
744 rn = 0;
745
746
747
748
749
750
751
752 if (w1_reset_bus(dev)) {
753 dev_dbg(&dev->dev, "No devices present on the wire.\n");
754 break;
755 }
756
757
758 w1_write_8(dev, search_type);
759 for (i = 0; i < 64; ++i) {
760
761 if (i == desc_bit)
762 search_bit = 1;
763 else if (i > desc_bit)
764 search_bit = 0;
765 else
766 search_bit = ((last_rn >> i) & 0x1);
767
768
769 triplet_ret = w1_triplet(dev, search_bit);
770
771
772 if ( (triplet_ret & 0x03) == 0x03 )
773 break;
774
775
776 if (triplet_ret == 0)
777 last_zero = i;
778
779
780 tmp64 = (triplet_ret >> 2);
781 rn |= (tmp64 << i);
782 }
783
784 if ( (triplet_ret & 0x03) != 0x03 ) {
785 if ( (desc_bit == last_zero) || (last_zero < 0))
786 last_device = 1;
787 desc_bit = last_zero;
788 cb(dev->bus_master->data, rn);
789 }
790 }
791}
792
793static int w1_control(void *data)
794{
795 struct w1_slave *sl, *sln;
796 struct w1_master *dev, *n;
797 int have_to_wait = 0;
798
799 set_freezable();
800 while (!kthread_should_stop() || have_to_wait) {
801 have_to_wait = 0;
802
803 try_to_freeze();
804 msleep_interruptible(w1_control_timeout * 1000);
805
806 list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
807 if (!kthread_should_stop() && !dev->flags)
808 continue;
809
810
811
812
813 if (!dev->initialized) {
814 have_to_wait = 1;
815 continue;
816 }
817
818 if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
819 set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
820
821 mutex_lock(&w1_mlock);
822 list_del(&dev->w1_master_entry);
823 mutex_unlock(&w1_mlock);
824
825 mutex_lock(&dev->mutex);
826 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
827 w1_slave_detach(sl);
828 }
829 w1_destroy_master_attributes(dev);
830 mutex_unlock(&dev->mutex);
831 atomic_dec(&dev->refcnt);
832 continue;
833 }
834
835 if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
836 dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
837 mutex_lock(&dev->mutex);
838 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
839 if (sl->family->fid == W1_FAMILY_DEFAULT) {
840 struct w1_reg_num rn;
841
842 memcpy(&rn, &sl->reg_num, sizeof(rn));
843 w1_slave_detach(sl);
844
845 w1_attach_slave_device(dev, &rn);
846 }
847 }
848 dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
849 clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
850 mutex_unlock(&dev->mutex);
851 }
852 }
853 }
854
855 return 0;
856}
857
858void w1_search_process(struct w1_master *dev, u8 search_type)
859{
860 struct w1_slave *sl, *sln;
861
862 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
863 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
864
865 w1_search_devices(dev, search_type, w1_slave_found);
866
867 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
868 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
869 w1_slave_detach(sl);
870 else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
871 sl->ttl = dev->slave_ttl;
872 }
873
874 if (dev->search_count > 0)
875 dev->search_count--;
876}
877
878int w1_process(void *data)
879{
880 struct w1_master *dev = (struct w1_master *) data;
881
882 while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
883 try_to_freeze();
884 msleep_interruptible(w1_timeout * 1000);
885
886 if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
887 break;
888
889 if (!dev->initialized)
890 continue;
891
892 if (dev->search_count == 0)
893 continue;
894
895 mutex_lock(&dev->mutex);
896 w1_search_process(dev, W1_SEARCH);
897 mutex_unlock(&dev->mutex);
898 }
899
900 atomic_dec(&dev->refcnt);
901
902 return 0;
903}
904
905static int w1_init(void)
906{
907 int retval;
908
909 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
910
911 w1_init_netlink();
912
913 retval = bus_register(&w1_bus_type);
914 if (retval) {
915 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
916 goto err_out_exit_init;
917 }
918
919 retval = driver_register(&w1_master_driver);
920 if (retval) {
921 printk(KERN_ERR
922 "Failed to register master driver. err=%d.\n",
923 retval);
924 goto err_out_bus_unregister;
925 }
926
927 retval = driver_register(&w1_slave_driver);
928 if (retval) {
929 printk(KERN_ERR
930 "Failed to register master driver. err=%d.\n",
931 retval);
932 goto err_out_master_unregister;
933 }
934
935 w1_control_thread = kthread_run(w1_control, NULL, "w1_control");
936 if (IS_ERR(w1_control_thread)) {
937 retval = PTR_ERR(w1_control_thread);
938 printk(KERN_ERR "Failed to create control thread. err=%d\n",
939 retval);
940 goto err_out_slave_unregister;
941 }
942
943 return 0;
944
945err_out_slave_unregister:
946 driver_unregister(&w1_slave_driver);
947
948err_out_master_unregister:
949 driver_unregister(&w1_master_driver);
950
951err_out_bus_unregister:
952 bus_unregister(&w1_bus_type);
953
954err_out_exit_init:
955 return retval;
956}
957
958static void w1_fini(void)
959{
960 struct w1_master *dev;
961
962 list_for_each_entry(dev, &w1_masters, w1_master_entry)
963 __w1_remove_master_device(dev);
964
965 w1_fini_netlink();
966
967 kthread_stop(w1_control_thread);
968
969 driver_unregister(&w1_slave_driver);
970 driver_unregister(&w1_master_driver);
971 bus_unregister(&w1_bus_type);
972}
973
974module_init(w1_init);
975module_exit(w1_fini);
976
