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>
34 #include <asm/atomic.h>
40 #include "w1_family.h"
41 #include "w1_netlink.h"
43 MODULE_LICENSE("GPL");
44 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
45 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
47 static int w1_timeout
= 10;
48 static int w1_control_timeout
= 1;
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(control_timeout
, w1_control_timeout
, int, 0);
54 module_param_named(max_slave_count
, w1_max_slave_count
, int, 0);
55 module_param_named(slave_ttl
, w1_max_slave_ttl
, int, 0);
57 DEFINE_SPINLOCK(w1_mlock
);
58 LIST_HEAD(w1_masters
);
60 static pid_t control_thread
;
61 static int control_needs_exit
;
62 static DECLARE_COMPLETION(w1_control_complete
);
64 static int w1_master_match(struct device
*dev
, struct device_driver
*drv
)
69 static int w1_master_probe(struct device
*dev
)
74 static void w1_master_release(struct device
*dev
)
76 struct w1_master
*md
= dev_to_w1_master(dev
);
78 dev_dbg(dev
, "%s: Releasing %s.\n", __func__
, md
->name
);
80 if (md
->nls
&& md
->nls
->sk_socket
)
81 sock_release(md
->nls
->sk_socket
);
82 memset(md
, 0, sizeof(struct w1_master
) + sizeof(struct w1_bus_master
));
86 static void w1_slave_release(struct device
*dev
)
88 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
90 dev_dbg(dev
, "%s: Releasing %s.\n", __func__
, sl
->name
);
92 while (atomic_read(&sl
->refcnt
)) {
93 dev_dbg(dev
, "Waiting for %s to become free: refcnt=%d.\n",
94 sl
->name
, atomic_read(&sl
->refcnt
));
95 if (msleep_interruptible(1000))
96 flush_signals(current
);
99 w1_family_put(sl
->family
);
100 sl
->master
->slave_count
--;
102 complete(&sl
->released
);
105 static ssize_t
w1_slave_read_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
107 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
109 return sprintf(buf
, "%s\n", sl
->name
);
112 static ssize_t
w1_slave_read_id(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
114 struct w1_slave
*sl
= kobj_to_w1_slave(kobj
);
116 atomic_inc(&sl
->refcnt
);
123 memcpy(buf
, (u8
*)&sl
->reg_num
, count
);
125 atomic_dec(&sl
->refcnt
);
130 static struct device_attribute w1_slave_attr_name
=
131 __ATTR(name
, S_IRUGO
, w1_slave_read_name
, NULL
);
133 static struct bin_attribute w1_slave_attr_bin_id
= {
137 .owner
= THIS_MODULE
,
140 .read
= w1_slave_read_id
,
144 static struct w1_family w1_default_family
;
146 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
);
148 static struct bus_type w1_bus_type
= {
150 .match
= w1_master_match
,
151 .hotplug
= w1_hotplug
,
154 struct device_driver w1_master_driver
= {
155 .name
= "w1_master_driver",
157 .probe
= w1_master_probe
,
160 struct device w1_master_device
= {
163 .bus_id
= "w1 bus master",
164 .driver
= &w1_master_driver
,
165 .release
= &w1_master_release
168 struct device_driver w1_slave_driver
= {
169 .name
= "w1_slave_driver",
173 struct device w1_slave_device
= {
176 .bus_id
= "w1 bus slave",
177 .driver
= &w1_slave_driver
,
178 .release
= &w1_slave_release
181 static ssize_t
w1_master_attribute_show_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
183 struct w1_master
*md
= dev_to_w1_master(dev
);
186 if (down_interruptible (&md
->mutex
))
189 count
= sprintf(buf
, "%s\n", md
->name
);
196 static ssize_t
w1_master_attribute_store_search(struct device
* dev
,
197 struct device_attribute
*attr
,
198 const char * buf
, size_t count
)
200 struct w1_master
*md
= dev_to_w1_master(dev
);
202 if (down_interruptible (&md
->mutex
))
205 md
->search_count
= simple_strtol(buf
, NULL
, 0);
212 static ssize_t
w1_master_attribute_show_search(struct device
*dev
,
213 struct device_attribute
*attr
,
216 struct w1_master
*md
= dev_to_w1_master(dev
);
219 if (down_interruptible (&md
->mutex
))
222 count
= sprintf(buf
, "%d\n", md
->search_count
);
229 static ssize_t
w1_master_attribute_show_pointer(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
231 struct w1_master
*md
= dev_to_w1_master(dev
);
234 if (down_interruptible(&md
->mutex
))
237 count
= sprintf(buf
, "0x%p\n", md
->bus_master
);
243 static ssize_t
w1_master_attribute_show_timeout(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
246 count
= sprintf(buf
, "%d\n", w1_timeout
);
250 static ssize_t
w1_master_attribute_show_max_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
252 struct w1_master
*md
= dev_to_w1_master(dev
);
255 if (down_interruptible(&md
->mutex
))
258 count
= sprintf(buf
, "%d\n", md
->max_slave_count
);
264 static ssize_t
w1_master_attribute_show_attempts(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
266 struct w1_master
*md
= dev_to_w1_master(dev
);
269 if (down_interruptible(&md
->mutex
))
272 count
= sprintf(buf
, "%lu\n", md
->attempts
);
278 static ssize_t
w1_master_attribute_show_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
280 struct w1_master
*md
= dev_to_w1_master(dev
);
283 if (down_interruptible(&md
->mutex
))
286 count
= sprintf(buf
, "%d\n", md
->slave_count
);
292 static ssize_t
w1_master_attribute_show_slaves(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
294 struct w1_master
*md
= dev_to_w1_master(dev
);
297 if (down_interruptible(&md
->mutex
))
300 if (md
->slave_count
== 0)
301 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "not found.\n");
303 struct list_head
*ent
, *n
;
306 list_for_each_safe(ent
, n
, &md
->slist
) {
307 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
309 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "%s\n", sl
->name
);
315 return PAGE_SIZE
- c
;
318 #define W1_MASTER_ATTR_RO(_name, _mode) \
319 struct device_attribute w1_master_attribute_##_name = \
320 __ATTR(w1_master_##_name, _mode, \
321 w1_master_attribute_show_##_name, NULL)
323 #define W1_MASTER_ATTR_RW(_name, _mode) \
324 struct device_attribute w1_master_attribute_##_name = \
325 __ATTR(w1_master_##_name, _mode, \
326 w1_master_attribute_show_##_name, \
327 w1_master_attribute_store_##_name)
329 static W1_MASTER_ATTR_RO(name
, S_IRUGO
);
330 static W1_MASTER_ATTR_RO(slaves
, S_IRUGO
);
331 static W1_MASTER_ATTR_RO(slave_count
, S_IRUGO
);
332 static W1_MASTER_ATTR_RO(max_slave_count
, S_IRUGO
);
333 static W1_MASTER_ATTR_RO(attempts
, S_IRUGO
);
334 static W1_MASTER_ATTR_RO(timeout
, S_IRUGO
);
335 static W1_MASTER_ATTR_RO(pointer
, S_IRUGO
);
336 static W1_MASTER_ATTR_RW(search
, S_IRUGO
| S_IWUGO
);
338 static struct attribute
*w1_master_default_attrs
[] = {
339 &w1_master_attribute_name
.attr
,
340 &w1_master_attribute_slaves
.attr
,
341 &w1_master_attribute_slave_count
.attr
,
342 &w1_master_attribute_max_slave_count
.attr
,
343 &w1_master_attribute_attempts
.attr
,
344 &w1_master_attribute_timeout
.attr
,
345 &w1_master_attribute_pointer
.attr
,
346 &w1_master_attribute_search
.attr
,
350 static struct attribute_group w1_master_defattr_group
= {
351 .attrs
= w1_master_default_attrs
,
354 int w1_create_master_attributes(struct w1_master
*master
)
356 return sysfs_create_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
359 void w1_destroy_master_attributes(struct w1_master
*master
)
361 sysfs_remove_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
364 #ifdef CONFIG_HOTPLUG
365 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
367 struct w1_master
*md
= NULL
;
368 struct w1_slave
*sl
= NULL
;
369 char *event_owner
, *name
;
370 int err
, cur_index
=0, cur_len
=0;
372 if (dev
->driver
== &w1_master_driver
) {
373 md
= container_of(dev
, struct w1_master
, dev
);
374 event_owner
= "master";
376 } else if (dev
->driver
== &w1_slave_driver
) {
377 sl
= container_of(dev
, struct w1_slave
, dev
);
378 event_owner
= "slave";
381 dev_dbg(dev
, "Unknown hotplug event.\n");
385 dev_dbg(dev
, "Hotplug event for %s %s, bus_id=%s.\n", event_owner
, name
, dev
->bus_id
);
387 if (dev
->driver
!= &w1_slave_driver
|| !sl
)
390 err
= add_hotplug_env_var(envp
, num_envp
, &cur_index
, buffer
, buffer_size
, &cur_len
, "W1_FID=%02X", sl
->reg_num
.family
);
394 err
= add_hotplug_env_var(envp
, num_envp
, &cur_index
, buffer
, buffer_size
, &cur_len
, "W1_SLAVE_ID=%024LX", (u64
)sl
->reg_num
.id
);
401 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
407 static int __w1_attach_slave_device(struct w1_slave
*sl
)
411 sl
->dev
.parent
= &sl
->master
->dev
;
412 sl
->dev
.driver
= &w1_slave_driver
;
413 sl
->dev
.bus
= &w1_bus_type
;
414 sl
->dev
.release
= &w1_slave_release
;
416 snprintf(&sl
->dev
.bus_id
[0], sizeof(sl
->dev
.bus_id
),
418 (unsigned int) sl
->reg_num
.family
,
419 (unsigned long long) sl
->reg_num
.id
);
420 snprintf(&sl
->name
[0], sizeof(sl
->name
),
422 (unsigned int) sl
->reg_num
.family
,
423 (unsigned long long) sl
->reg_num
.id
);
425 dev_dbg(&sl
->dev
, "%s: registering %s as %p.\n", __func__
, &sl
->dev
.bus_id
[0]);
427 err
= device_register(&sl
->dev
);
430 "Device registration [%s] failed. err=%d\n",
431 sl
->dev
.bus_id
, err
);
435 /* Create "name" entry */
436 err
= device_create_file(&sl
->dev
, &w1_slave_attr_name
);
439 "sysfs file creation for [%s] failed. err=%d\n",
440 sl
->dev
.bus_id
, err
);
444 /* Create "id" entry */
445 err
= sysfs_create_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
448 "sysfs file creation for [%s] failed. err=%d\n",
449 sl
->dev
.bus_id
, err
);
453 /* if the family driver needs to initialize something... */
454 if (sl
->family
->fops
&& sl
->family
->fops
->add_slave
&&
455 ((err
= sl
->family
->fops
->add_slave(sl
)) < 0)) {
457 "sysfs file creation for [%s] failed. err=%d\n",
458 sl
->dev
.bus_id
, err
);
462 list_add_tail(&sl
->w1_slave_entry
, &sl
->master
->slist
);
467 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
469 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
471 device_unregister(&sl
->dev
);
475 static int w1_attach_slave_device(struct w1_master
*dev
, struct w1_reg_num
*rn
)
480 struct w1_netlink_msg msg
;
482 sl
= kmalloc(sizeof(struct w1_slave
), GFP_KERNEL
);
485 "%s: failed to allocate new slave device.\n",
490 memset(sl
, 0, sizeof(*sl
));
492 sl
->owner
= THIS_MODULE
;
494 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
496 memcpy(&sl
->reg_num
, rn
, sizeof(sl
->reg_num
));
497 atomic_set(&sl
->refcnt
, 0);
498 init_completion(&sl
->released
);
500 spin_lock(&w1_flock
);
501 f
= w1_family_registered(rn
->family
);
503 f
= &w1_default_family
;
504 dev_info(&dev
->dev
, "Family %x for %02x.%012llx.%02x is not registered.\n",
505 rn
->family
, rn
->family
,
506 (unsigned long long)rn
->id
, rn
->crc
);
509 spin_unlock(&w1_flock
);
514 err
= __w1_attach_slave_device(sl
);
516 dev_err(&dev
->dev
, "%s: Attaching %s failed.\n", __func__
,
518 w1_family_put(sl
->family
);
523 sl
->ttl
= dev
->slave_ttl
;
526 memcpy(&msg
.id
.id
, rn
, sizeof(msg
.id
.id
));
527 msg
.type
= W1_SLAVE_ADD
;
528 w1_netlink_send(dev
, &msg
);
533 static void w1_slave_detach(struct w1_slave
*sl
)
535 struct w1_netlink_msg msg
;
537 dev_dbg(&sl
->dev
, "%s: detaching %s [%p].\n", __func__
, sl
->name
, sl
);
539 list_del(&sl
->w1_slave_entry
);
541 if (sl
->family
->fops
&& sl
->family
->fops
->remove_slave
)
542 sl
->family
->fops
->remove_slave(sl
);
544 memcpy(&msg
.id
.id
, &sl
->reg_num
, sizeof(msg
.id
.id
));
545 msg
.type
= W1_SLAVE_REMOVE
;
546 w1_netlink_send(sl
->master
, &msg
);
548 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
549 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
550 device_unregister(&sl
->dev
);
552 wait_for_completion(&sl
->released
);
556 static struct w1_master
*w1_search_master(unsigned long data
)
558 struct w1_master
*dev
;
561 spin_lock_bh(&w1_mlock
);
562 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
563 if (dev
->bus_master
->data
== data
) {
565 atomic_inc(&dev
->refcnt
);
569 spin_unlock_bh(&w1_mlock
);
571 return (found
)?dev
:NULL
;
574 void w1_reconnect_slaves(struct w1_family
*f
)
576 struct w1_master
*dev
;
578 spin_lock_bh(&w1_mlock
);
579 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
580 dev_dbg(&dev
->dev
, "Reconnecting slaves in %s into new family %02x.\n",
582 set_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
);
584 spin_unlock_bh(&w1_mlock
);
587 static void w1_slave_found(unsigned long data
, u64 rn
)
591 struct list_head
*ent
;
592 struct w1_reg_num
*tmp
;
593 int family_found
= 0;
594 struct w1_master
*dev
;
595 u64 rn_le
= cpu_to_le64(rn
);
597 dev
= w1_search_master(data
);
599 printk(KERN_ERR
"Failed to find w1 master device for data %08lx, it is impossible.\n",
604 tmp
= (struct w1_reg_num
*) &rn
;
607 list_for_each(ent
, &dev
->slist
) {
609 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
611 if (sl
->reg_num
.family
== tmp
->family
&&
612 sl
->reg_num
.id
== tmp
->id
&&
613 sl
->reg_num
.crc
== tmp
->crc
) {
614 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
616 } else if (sl
->reg_num
.family
== tmp
->family
) {
624 if (slave_count
== dev
->slave_count
&&
625 rn
&& ((rn
>> 56) & 0xff) == w1_calc_crc8((u8
*)&rn_le
, 7)) {
626 w1_attach_slave_device(dev
, tmp
);
629 atomic_dec(&dev
->refcnt
);
633 * Performs a ROM Search & registers any devices found.
634 * The 1-wire search is a simple binary tree search.
635 * For each bit of the address, we read two bits and write one bit.
636 * The bit written will put to sleep all devies that don't match that bit.
637 * When the two reads differ, the direction choice is obvious.
638 * When both bits are 0, we must choose a path to take.
639 * When we can scan all 64 bits without having to choose a path, we are done.
641 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
643 * @dev The master device to search
644 * @cb Function to call when a device is found
646 void w1_search(struct w1_master
*dev
, w1_slave_found_callback cb
)
648 u64 last_rn
, rn
, tmp64
;
649 int i
, slave_count
= 0;
650 int last_zero
, last_device
;
651 int search_bit
, desc_bit
;
661 while ( !last_device
&& (slave_count
++ < dev
->max_slave_count
) ) {
666 * Reset bus and all 1-wire device state machines
667 * so they can respond to our requests.
669 * Return 0 - device(s) present, 1 - no devices present.
671 if (w1_reset_bus(dev
)) {
672 dev_dbg(&dev
->dev
, "No devices present on the wire.\n");
676 /* Start the search */
677 w1_write_8(dev
, W1_SEARCH
);
678 for (i
= 0; i
< 64; ++i
) {
679 /* Determine the direction/search bit */
681 search_bit
= 1; /* took the 0 path last time, so take the 1 path */
682 else if (i
> desc_bit
)
683 search_bit
= 0; /* take the 0 path on the next branch */
685 search_bit
= ((last_rn
>> i
) & 0x1);
687 /** Read two bits and write one bit */
688 triplet_ret
= w1_triplet(dev
, search_bit
);
690 /* quit if no device responded */
691 if ( (triplet_ret
& 0x03) == 0x03 )
694 /* If both directions were valid, and we took the 0 path... */
695 if (triplet_ret
== 0)
698 /* extract the direction taken & update the device number */
699 tmp64
= (triplet_ret
>> 2);
703 if ( (triplet_ret
& 0x03) != 0x03 ) {
704 if ( (desc_bit
== last_zero
) || (last_zero
< 0))
706 desc_bit
= last_zero
;
707 cb(dev
->bus_master
->data
, rn
);
712 static int w1_control(void *data
)
714 struct w1_slave
*sl
, *sln
;
715 struct w1_master
*dev
, *n
;
716 int err
, have_to_wait
= 0;
718 daemonize("w1_control");
719 allow_signal(SIGTERM
);
721 while (!control_needs_exit
|| have_to_wait
) {
725 msleep_interruptible(w1_control_timeout
* 1000);
727 if (signal_pending(current
))
728 flush_signals(current
);
730 list_for_each_entry_safe(dev
, n
, &w1_masters
, w1_master_entry
) {
731 if (!control_needs_exit
&& !dev
->flags
)
734 * Little race: we can create thread but not set the flag.
735 * Get a chance for external process to set flag up.
737 if (!dev
->initialized
) {
742 if (control_needs_exit
) {
743 set_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
);
745 err
= kill_proc(dev
->kpid
, SIGTERM
, 1);
748 "Failed to send signal to w1 kernel thread %d.\n",
752 if (test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
)) {
753 wait_for_completion(&dev
->dev_exited
);
754 spin_lock_bh(&w1_mlock
);
755 list_del(&dev
->w1_master_entry
);
756 spin_unlock_bh(&w1_mlock
);
759 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
762 w1_destroy_master_attributes(dev
);
764 atomic_dec(&dev
->refcnt
);
768 if (test_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
)) {
769 dev_dbg(&dev
->dev
, "Reconnecting slaves in device %s.\n", dev
->name
);
771 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
772 if (sl
->family
->fid
== W1_FAMILY_DEFAULT
) {
773 struct w1_reg_num rn
;
775 memcpy(&rn
, &sl
->reg_num
, sizeof(rn
));
778 w1_attach_slave_device(dev
, &rn
);
781 dev_dbg(&dev
->dev
, "Reconnecting slaves in device %s has been finished.\n", dev
->name
);
782 clear_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
);
788 complete_and_exit(&w1_control_complete
, 0);
791 int w1_process(void *data
)
793 struct w1_master
*dev
= (struct w1_master
*) data
;
794 struct w1_slave
*sl
, *sln
;
796 daemonize("%s", dev
->name
);
797 allow_signal(SIGTERM
);
799 while (!test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
)) {
801 msleep_interruptible(w1_timeout
* 1000);
803 if (signal_pending(current
))
804 flush_signals(current
);
806 if (test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
))
809 if (!dev
->initialized
)
812 if (dev
->search_count
== 0)
815 if (down_interruptible(&dev
->mutex
))
818 list_for_each_entry(sl
, &dev
->slist
, w1_slave_entry
)
819 clear_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
821 w1_search_devices(dev
, w1_slave_found
);
823 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
824 if (!test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
) && !--sl
->ttl
) {
828 } else if (test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
))
829 sl
->ttl
= dev
->slave_ttl
;
832 if (dev
->search_count
> 0)
838 atomic_dec(&dev
->refcnt
);
839 complete_and_exit(&dev
->dev_exited
, 0);
844 static int w1_init(void)
848 printk(KERN_INFO
"Driver for 1-wire Dallas network protocol.\n");
850 retval
= bus_register(&w1_bus_type
);
852 printk(KERN_ERR
"Failed to register bus. err=%d.\n", retval
);
853 goto err_out_exit_init
;
856 retval
= driver_register(&w1_master_driver
);
859 "Failed to register master driver. err=%d.\n",
861 goto err_out_bus_unregister
;
864 retval
= driver_register(&w1_slave_driver
);
867 "Failed to register master driver. err=%d.\n",
869 goto err_out_master_unregister
;
872 control_thread
= kernel_thread(&w1_control
, NULL
, 0);
873 if (control_thread
< 0) {
874 printk(KERN_ERR
"Failed to create control thread. err=%d\n",
876 retval
= control_thread
;
877 goto err_out_slave_unregister
;
882 err_out_slave_unregister
:
883 driver_unregister(&w1_slave_driver
);
885 err_out_master_unregister
:
886 driver_unregister(&w1_master_driver
);
888 err_out_bus_unregister
:
889 bus_unregister(&w1_bus_type
);
895 static void w1_fini(void)
897 struct w1_master
*dev
;
899 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
)
900 __w1_remove_master_device(dev
);
902 control_needs_exit
= 1;
903 wait_for_completion(&w1_control_complete
);
905 driver_unregister(&w1_slave_driver
);
906 driver_unregister(&w1_master_driver
);
907 bus_unregister(&w1_bus_type
);
910 module_init(w1_init
);
911 module_exit(w1_fini
);