4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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.
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.
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
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>
36 #include <asm/atomic.h>
41 #include "w1_family.h"
42 #include "w1_netlink.h"
44 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
46 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
48 static int w1_timeout
= 10;
49 int w1_max_slave_count
= 10;
50 int w1_max_slave_ttl
= 10;
52 module_param_named(timeout
, w1_timeout
, int, 0);
53 module_param_named(max_slave_count
, w1_max_slave_count
, int, 0);
54 module_param_named(slave_ttl
, w1_max_slave_ttl
, int, 0);
56 DEFINE_MUTEX(w1_mlock
);
57 LIST_HEAD(w1_masters
);
59 static int w1_master_match(struct device
*dev
, struct device_driver
*drv
)
64 static int w1_master_probe(struct device
*dev
)
69 static void w1_master_release(struct device
*dev
)
71 struct w1_master
*md
= dev_to_w1_master(dev
);
73 dev_dbg(dev
, "%s: Releasing %s.\n", __func__
, md
->name
);
74 memset(md
, 0, sizeof(struct w1_master
) + sizeof(struct w1_bus_master
));
78 static void w1_slave_release(struct device
*dev
)
80 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
82 printk("%s: Releasing %s.\n", __func__
, sl
->name
);
84 while (atomic_read(&sl
->refcnt
)) {
85 printk("Waiting for %s to become free: refcnt=%d.\n",
86 sl
->name
, atomic_read(&sl
->refcnt
));
87 if (msleep_interruptible(1000))
88 flush_signals(current
);
91 w1_family_put(sl
->family
);
92 sl
->master
->slave_count
--;
94 complete(&sl
->released
);
97 static ssize_t
w1_slave_read_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
99 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
101 return sprintf(buf
, "%s\n", sl
->name
);
104 static ssize_t
w1_slave_read_id(struct kobject
*kobj
,
105 struct bin_attribute
*bin_attr
,
106 char *buf
, loff_t off
, size_t count
)
108 struct w1_slave
*sl
= kobj_to_w1_slave(kobj
);
116 memcpy(buf
, (u8
*)&sl
->reg_num
, count
);
122 static struct device_attribute w1_slave_attr_name
=
123 __ATTR(name
, S_IRUGO
, w1_slave_read_name
, NULL
);
125 static struct bin_attribute w1_slave_attr_bin_id
= {
131 .read
= w1_slave_read_id
,
136 static ssize_t
w1_default_write(struct kobject
*kobj
,
137 struct bin_attribute
*bin_attr
,
138 char *buf
, loff_t off
, size_t count
)
140 struct w1_slave
*sl
= kobj_to_w1_slave(kobj
);
142 mutex_lock(&sl
->master
->mutex
);
143 if (w1_reset_select_slave(sl
)) {
148 w1_write_block(sl
->master
, buf
, count
);
151 mutex_unlock(&sl
->master
->mutex
);
155 static ssize_t
w1_default_read(struct kobject
*kobj
,
156 struct bin_attribute
*bin_attr
,
157 char *buf
, loff_t off
, size_t count
)
159 struct w1_slave
*sl
= kobj_to_w1_slave(kobj
);
161 mutex_lock(&sl
->master
->mutex
);
162 w1_read_block(sl
->master
, buf
, count
);
163 mutex_unlock(&sl
->master
->mutex
);
167 static struct bin_attribute w1_default_attr
= {
170 .mode
= S_IRUGO
| S_IWUSR
,
173 .read
= w1_default_read
,
174 .write
= w1_default_write
,
177 static int w1_default_add_slave(struct w1_slave
*sl
)
179 return sysfs_create_bin_file(&sl
->dev
.kobj
, &w1_default_attr
);
182 static void w1_default_remove_slave(struct w1_slave
*sl
)
184 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_default_attr
);
187 static struct w1_family_ops w1_default_fops
= {
188 .add_slave
= w1_default_add_slave
,
189 .remove_slave
= w1_default_remove_slave
,
192 static struct w1_family w1_default_family
= {
193 .fops
= &w1_default_fops
,
196 static int w1_uevent(struct device
*dev
, struct kobj_uevent_env
*env
);
198 static struct bus_type w1_bus_type
= {
200 .match
= w1_master_match
,
204 struct device_driver w1_master_driver
= {
205 .name
= "w1_master_driver",
207 .probe
= w1_master_probe
,
210 struct device w1_master_device
= {
213 .bus_id
= "w1 bus master",
214 .driver
= &w1_master_driver
,
215 .release
= &w1_master_release
218 static struct device_driver w1_slave_driver
= {
219 .name
= "w1_slave_driver",
224 struct device w1_slave_device
= {
227 .bus_id
= "w1 bus slave",
228 .driver
= &w1_slave_driver
,
229 .release
= &w1_slave_release
233 static ssize_t
w1_master_attribute_show_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
235 struct w1_master
*md
= dev_to_w1_master(dev
);
238 mutex_lock(&md
->mutex
);
239 count
= sprintf(buf
, "%s\n", md
->name
);
240 mutex_unlock(&md
->mutex
);
245 static ssize_t
w1_master_attribute_store_search(struct device
* dev
,
246 struct device_attribute
*attr
,
247 const char * buf
, size_t count
)
249 struct w1_master
*md
= dev_to_w1_master(dev
);
251 mutex_lock(&md
->mutex
);
252 md
->search_count
= simple_strtol(buf
, NULL
, 0);
253 mutex_unlock(&md
->mutex
);
258 static ssize_t
w1_master_attribute_show_search(struct device
*dev
,
259 struct device_attribute
*attr
,
262 struct w1_master
*md
= dev_to_w1_master(dev
);
265 mutex_lock(&md
->mutex
);
266 count
= sprintf(buf
, "%d\n", md
->search_count
);
267 mutex_unlock(&md
->mutex
);
272 static ssize_t
w1_master_attribute_show_pointer(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
274 struct w1_master
*md
= dev_to_w1_master(dev
);
277 mutex_lock(&md
->mutex
);
278 count
= sprintf(buf
, "0x%p\n", md
->bus_master
);
279 mutex_unlock(&md
->mutex
);
283 static ssize_t
w1_master_attribute_show_timeout(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
286 count
= sprintf(buf
, "%d\n", w1_timeout
);
290 static ssize_t
w1_master_attribute_show_max_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
292 struct w1_master
*md
= dev_to_w1_master(dev
);
295 mutex_lock(&md
->mutex
);
296 count
= sprintf(buf
, "%d\n", md
->max_slave_count
);
297 mutex_unlock(&md
->mutex
);
301 static ssize_t
w1_master_attribute_show_attempts(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
303 struct w1_master
*md
= dev_to_w1_master(dev
);
306 mutex_lock(&md
->mutex
);
307 count
= sprintf(buf
, "%lu\n", md
->attempts
);
308 mutex_unlock(&md
->mutex
);
312 static ssize_t
w1_master_attribute_show_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
314 struct w1_master
*md
= dev_to_w1_master(dev
);
317 mutex_lock(&md
->mutex
);
318 count
= sprintf(buf
, "%d\n", md
->slave_count
);
319 mutex_unlock(&md
->mutex
);
323 static ssize_t
w1_master_attribute_show_slaves(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
325 struct w1_master
*md
= dev_to_w1_master(dev
);
328 mutex_lock(&md
->mutex
);
330 if (md
->slave_count
== 0)
331 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "not found.\n");
333 struct list_head
*ent
, *n
;
336 list_for_each_safe(ent
, n
, &md
->slist
) {
337 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
339 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "%s\n", sl
->name
);
343 mutex_unlock(&md
->mutex
);
345 return PAGE_SIZE
- c
;
348 #define W1_MASTER_ATTR_RO(_name, _mode) \
349 struct device_attribute w1_master_attribute_##_name = \
350 __ATTR(w1_master_##_name, _mode, \
351 w1_master_attribute_show_##_name, NULL)
353 #define W1_MASTER_ATTR_RW(_name, _mode) \
354 struct device_attribute w1_master_attribute_##_name = \
355 __ATTR(w1_master_##_name, _mode, \
356 w1_master_attribute_show_##_name, \
357 w1_master_attribute_store_##_name)
359 static W1_MASTER_ATTR_RO(name
, S_IRUGO
);
360 static W1_MASTER_ATTR_RO(slaves
, S_IRUGO
);
361 static W1_MASTER_ATTR_RO(slave_count
, S_IRUGO
);
362 static W1_MASTER_ATTR_RO(max_slave_count
, S_IRUGO
);
363 static W1_MASTER_ATTR_RO(attempts
, S_IRUGO
);
364 static W1_MASTER_ATTR_RO(timeout
, S_IRUGO
);
365 static W1_MASTER_ATTR_RO(pointer
, S_IRUGO
);
366 static W1_MASTER_ATTR_RW(search
, S_IRUGO
| S_IWUGO
);
368 static struct attribute
*w1_master_default_attrs
[] = {
369 &w1_master_attribute_name
.attr
,
370 &w1_master_attribute_slaves
.attr
,
371 &w1_master_attribute_slave_count
.attr
,
372 &w1_master_attribute_max_slave_count
.attr
,
373 &w1_master_attribute_attempts
.attr
,
374 &w1_master_attribute_timeout
.attr
,
375 &w1_master_attribute_pointer
.attr
,
376 &w1_master_attribute_search
.attr
,
380 static struct attribute_group w1_master_defattr_group
= {
381 .attrs
= w1_master_default_attrs
,
384 int w1_create_master_attributes(struct w1_master
*master
)
386 return sysfs_create_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
389 void w1_destroy_master_attributes(struct w1_master
*master
)
391 sysfs_remove_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
394 #ifdef CONFIG_HOTPLUG
395 static int w1_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
397 struct w1_master
*md
= NULL
;
398 struct w1_slave
*sl
= NULL
;
399 char *event_owner
, *name
;
402 if (dev
->driver
== &w1_master_driver
) {
403 md
= container_of(dev
, struct w1_master
, dev
);
404 event_owner
= "master";
406 } else if (dev
->driver
== &w1_slave_driver
) {
407 sl
= container_of(dev
, struct w1_slave
, dev
);
408 event_owner
= "slave";
411 dev_dbg(dev
, "Unknown event.\n");
415 dev_dbg(dev
, "Hotplug event for %s %s, bus_id=%s.\n",
416 event_owner
, name
, dev
->bus_id
);
418 if (dev
->driver
!= &w1_slave_driver
|| !sl
)
421 err
= add_uevent_var(env
, "W1_FID=%02X", sl
->reg_num
.family
);
425 err
= add_uevent_var(env
, "W1_SLAVE_ID=%024LX",
426 (unsigned long long)sl
->reg_num
.id
);
433 static int w1_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
439 static int __w1_attach_slave_device(struct w1_slave
*sl
)
443 sl
->dev
.parent
= &sl
->master
->dev
;
444 sl
->dev
.driver
= &w1_slave_driver
;
445 sl
->dev
.bus
= &w1_bus_type
;
446 sl
->dev
.release
= &w1_slave_release
;
448 snprintf(&sl
->dev
.bus_id
[0], sizeof(sl
->dev
.bus_id
),
450 (unsigned int) sl
->reg_num
.family
,
451 (unsigned long long) sl
->reg_num
.id
);
452 snprintf(&sl
->name
[0], sizeof(sl
->name
),
454 (unsigned int) sl
->reg_num
.family
,
455 (unsigned long long) sl
->reg_num
.id
);
457 dev_dbg(&sl
->dev
, "%s: registering %s as %p.\n", __func__
,
458 &sl
->dev
.bus_id
[0], sl
);
460 err
= device_register(&sl
->dev
);
463 "Device registration [%s] failed. err=%d\n",
464 sl
->dev
.bus_id
, err
);
468 /* Create "name" entry */
469 err
= device_create_file(&sl
->dev
, &w1_slave_attr_name
);
472 "sysfs file creation for [%s] failed. err=%d\n",
473 sl
->dev
.bus_id
, err
);
477 /* Create "id" entry */
478 err
= sysfs_create_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
481 "sysfs file creation for [%s] failed. err=%d\n",
482 sl
->dev
.bus_id
, err
);
486 /* if the family driver needs to initialize something... */
487 if (sl
->family
->fops
&& sl
->family
->fops
->add_slave
&&
488 ((err
= sl
->family
->fops
->add_slave(sl
)) < 0)) {
490 "sysfs file creation for [%s] failed. err=%d\n",
491 sl
->dev
.bus_id
, err
);
495 list_add_tail(&sl
->w1_slave_entry
, &sl
->master
->slist
);
500 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
502 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
504 device_unregister(&sl
->dev
);
508 static int w1_attach_slave_device(struct w1_master
*dev
, struct w1_reg_num
*rn
)
513 struct w1_netlink_msg msg
;
515 sl
= kzalloc(sizeof(struct w1_slave
), GFP_KERNEL
);
518 "%s: failed to allocate new slave device.\n",
524 sl
->owner
= THIS_MODULE
;
526 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
528 memset(&msg
, 0, sizeof(msg
));
529 memcpy(&sl
->reg_num
, rn
, sizeof(sl
->reg_num
));
530 atomic_set(&sl
->refcnt
, 0);
531 init_completion(&sl
->released
);
533 spin_lock(&w1_flock
);
534 f
= w1_family_registered(rn
->family
);
536 f
= &w1_default_family
;
537 dev_info(&dev
->dev
, "Family %x for %02x.%012llx.%02x is not registered.\n",
538 rn
->family
, rn
->family
,
539 (unsigned long long)rn
->id
, rn
->crc
);
542 spin_unlock(&w1_flock
);
547 err
= __w1_attach_slave_device(sl
);
549 dev_err(&dev
->dev
, "%s: Attaching %s failed.\n", __func__
,
551 w1_family_put(sl
->family
);
556 sl
->ttl
= dev
->slave_ttl
;
559 memcpy(msg
.id
.id
, rn
, sizeof(msg
.id
));
560 msg
.type
= W1_SLAVE_ADD
;
561 w1_netlink_send(dev
, &msg
);
566 void w1_slave_detach(struct w1_slave
*sl
)
568 struct w1_netlink_msg msg
;
570 dev_dbg(&sl
->dev
, "%s: detaching %s [%p].\n", __func__
, sl
->name
, sl
);
572 list_del(&sl
->w1_slave_entry
);
574 if (sl
->family
->fops
&& sl
->family
->fops
->remove_slave
)
575 sl
->family
->fops
->remove_slave(sl
);
577 memset(&msg
, 0, sizeof(msg
));
578 memcpy(msg
.id
.id
, &sl
->reg_num
, sizeof(msg
.id
));
579 msg
.type
= W1_SLAVE_REMOVE
;
580 w1_netlink_send(sl
->master
, &msg
);
582 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
583 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
584 device_unregister(&sl
->dev
);
586 wait_for_completion(&sl
->released
);
590 struct w1_master
*w1_search_master_id(u32 id
)
592 struct w1_master
*dev
;
595 mutex_lock(&w1_mlock
);
596 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
599 atomic_inc(&dev
->refcnt
);
603 mutex_unlock(&w1_mlock
);
605 return (found
)?dev
:NULL
;
608 struct w1_slave
*w1_search_slave(struct w1_reg_num
*id
)
610 struct w1_master
*dev
;
611 struct w1_slave
*sl
= NULL
;
614 mutex_lock(&w1_mlock
);
615 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
616 mutex_lock(&dev
->mutex
);
617 list_for_each_entry(sl
, &dev
->slist
, w1_slave_entry
) {
618 if (sl
->reg_num
.family
== id
->family
&&
619 sl
->reg_num
.id
== id
->id
&&
620 sl
->reg_num
.crc
== id
->crc
) {
622 atomic_inc(&dev
->refcnt
);
623 atomic_inc(&sl
->refcnt
);
627 mutex_unlock(&dev
->mutex
);
632 mutex_unlock(&w1_mlock
);
634 return (found
)?sl
:NULL
;
637 void w1_reconnect_slaves(struct w1_family
*f
, int attach
)
639 struct w1_slave
*sl
, *sln
;
640 struct w1_master
*dev
;
642 mutex_lock(&w1_mlock
);
643 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
644 dev_dbg(&dev
->dev
, "Reconnecting slaves in device %s "
645 "for family %02x.\n", dev
->name
, f
->fid
);
646 mutex_lock(&dev
->mutex
);
647 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
648 /* If it is a new family, slaves with the default
649 * family driver and are that family will be
650 * connected. If the family is going away, devices
651 * matching that family are reconneced.
653 if ((attach
&& sl
->family
->fid
== W1_FAMILY_DEFAULT
654 && sl
->reg_num
.family
== f
->fid
) ||
655 (!attach
&& sl
->family
->fid
== f
->fid
)) {
656 struct w1_reg_num rn
;
658 memcpy(&rn
, &sl
->reg_num
, sizeof(rn
));
661 w1_attach_slave_device(dev
, &rn
);
664 dev_dbg(&dev
->dev
, "Reconnecting slaves in device %s "
665 "has been finished.\n", dev
->name
);
666 mutex_unlock(&dev
->mutex
);
668 mutex_unlock(&w1_mlock
);
671 static void w1_slave_found(struct w1_master
*dev
, u64 rn
)
675 struct list_head
*ent
;
676 struct w1_reg_num
*tmp
;
677 u64 rn_le
= cpu_to_le64(rn
);
679 atomic_inc(&dev
->refcnt
);
681 tmp
= (struct w1_reg_num
*) &rn
;
684 list_for_each(ent
, &dev
->slist
) {
686 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
688 if (sl
->reg_num
.family
== tmp
->family
&&
689 sl
->reg_num
.id
== tmp
->id
&&
690 sl
->reg_num
.crc
== tmp
->crc
) {
691 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
698 if (slave_count
== dev
->slave_count
&&
699 rn
&& ((rn
>> 56) & 0xff) == w1_calc_crc8((u8
*)&rn_le
, 7)) {
700 w1_attach_slave_device(dev
, tmp
);
703 atomic_dec(&dev
->refcnt
);
707 * Performs a ROM Search & registers any devices found.
708 * The 1-wire search is a simple binary tree search.
709 * For each bit of the address, we read two bits and write one bit.
710 * The bit written will put to sleep all devies that don't match that bit.
711 * When the two reads differ, the direction choice is obvious.
712 * When both bits are 0, we must choose a path to take.
713 * When we can scan all 64 bits without having to choose a path, we are done.
715 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
717 * @dev The master device to search
718 * @cb Function to call when a device is found
720 void w1_search(struct w1_master
*dev
, u8 search_type
, w1_slave_found_callback cb
)
722 u64 last_rn
, rn
, tmp64
;
723 int i
, slave_count
= 0;
724 int last_zero
, last_device
;
725 int search_bit
, desc_bit
;
735 while ( !last_device
&& (slave_count
++ < dev
->max_slave_count
) ) {
740 * Reset bus and all 1-wire device state machines
741 * so they can respond to our requests.
743 * Return 0 - device(s) present, 1 - no devices present.
745 if (w1_reset_bus(dev
)) {
746 dev_dbg(&dev
->dev
, "No devices present on the wire.\n");
750 /* Start the search */
751 w1_write_8(dev
, search_type
);
752 for (i
= 0; i
< 64; ++i
) {
753 /* Determine the direction/search bit */
755 search_bit
= 1; /* took the 0 path last time, so take the 1 path */
756 else if (i
> desc_bit
)
757 search_bit
= 0; /* take the 0 path on the next branch */
759 search_bit
= ((last_rn
>> i
) & 0x1);
761 /** Read two bits and write one bit */
762 triplet_ret
= w1_triplet(dev
, search_bit
);
764 /* quit if no device responded */
765 if ( (triplet_ret
& 0x03) == 0x03 )
768 /* If both directions were valid, and we took the 0 path... */
769 if (triplet_ret
== 0)
772 /* extract the direction taken & update the device number */
773 tmp64
= (triplet_ret
>> 2);
777 if ( (triplet_ret
& 0x03) != 0x03 ) {
778 if ( (desc_bit
== last_zero
) || (last_zero
< 0))
780 desc_bit
= last_zero
;
786 void w1_search_process(struct w1_master
*dev
, u8 search_type
)
788 struct w1_slave
*sl
, *sln
;
790 list_for_each_entry(sl
, &dev
->slist
, w1_slave_entry
)
791 clear_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
793 w1_search_devices(dev
, search_type
, w1_slave_found
);
795 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
796 if (!test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
) && !--sl
->ttl
)
798 else if (test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
))
799 sl
->ttl
= dev
->slave_ttl
;
802 if (dev
->search_count
> 0)
806 int w1_process(void *data
)
808 struct w1_master
*dev
= (struct w1_master
*) data
;
810 while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
)) {
812 msleep_interruptible(w1_timeout
* 1000);
814 if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
))
817 if (!dev
->initialized
)
820 if (dev
->search_count
== 0)
823 mutex_lock(&dev
->mutex
);
824 w1_search_process(dev
, W1_SEARCH
);
825 mutex_unlock(&dev
->mutex
);
828 atomic_dec(&dev
->refcnt
);
833 static int w1_init(void)
837 printk(KERN_INFO
"Driver for 1-wire Dallas network protocol.\n");
841 retval
= bus_register(&w1_bus_type
);
843 printk(KERN_ERR
"Failed to register bus. err=%d.\n", retval
);
844 goto err_out_exit_init
;
847 retval
= driver_register(&w1_master_driver
);
850 "Failed to register master driver. err=%d.\n",
852 goto err_out_bus_unregister
;
855 retval
= driver_register(&w1_slave_driver
);
858 "Failed to register master driver. err=%d.\n",
860 goto err_out_master_unregister
;
866 /* For undoing the slave register if there was a step after it. */
867 err_out_slave_unregister
:
868 driver_unregister(&w1_slave_driver
);
871 err_out_master_unregister
:
872 driver_unregister(&w1_master_driver
);
874 err_out_bus_unregister
:
875 bus_unregister(&w1_bus_type
);
881 static void w1_fini(void)
883 struct w1_master
*dev
;
885 /* Set netlink removal messages and some cleanup */
886 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
)
887 __w1_remove_master_device(dev
);
891 driver_unregister(&w1_slave_driver
);
892 driver_unregister(&w1_master_driver
);
893 bus_unregister(&w1_bus_type
);
896 module_init(w1_init
);
897 module_exit(w1_fini
);