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 int w1_max_slave_count
= 10;
49 int w1_max_slave_ttl
= 10;
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);
55 DEFINE_SPINLOCK(w1_mlock
);
56 LIST_HEAD(w1_masters
);
58 static pid_t control_thread
;
59 static int control_needs_exit
;
60 static DECLARE_COMPLETION(w1_control_complete
);
62 static int w1_master_match(struct device
*dev
, struct device_driver
*drv
)
67 static int w1_master_probe(struct device
*dev
)
72 static int w1_master_remove(struct device
*dev
)
77 static void w1_master_release(struct device
*dev
)
79 struct w1_master
*md
= dev_to_w1_master(dev
);
80 complete(&md
->dev_released
);
83 static void w1_slave_release(struct device
*dev
)
85 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
86 complete(&sl
->dev_released
);
89 static ssize_t
w1_slave_read_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
91 struct w1_slave
*sl
= dev_to_w1_slave(dev
);
93 return sprintf(buf
, "%s\n", sl
->name
);
96 static ssize_t
w1_slave_read_id(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
98 struct w1_slave
*sl
= kobj_to_w1_slave(kobj
);
100 atomic_inc(&sl
->refcnt
);
107 memcpy(buf
, (u8
*)&sl
->reg_num
, count
);
109 atomic_dec(&sl
->refcnt
);
114 static struct device_attribute w1_slave_attr_name
=
115 __ATTR(name
, S_IRUGO
, w1_slave_read_name
, NULL
);
117 static struct bin_attribute w1_slave_attr_bin_id
= {
121 .owner
= THIS_MODULE
,
124 .read
= w1_slave_read_id
,
128 static struct w1_family w1_default_family
;
130 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
);
132 static struct bus_type w1_bus_type
= {
134 .match
= w1_master_match
,
135 .hotplug
= w1_hotplug
,
138 struct device_driver w1_master_driver
= {
139 .name
= "w1_master_driver",
141 .probe
= w1_master_probe
,
142 .remove
= w1_master_remove
,
145 struct device w1_master_device
= {
148 .bus_id
= "w1 bus master",
149 .driver
= &w1_master_driver
,
150 .release
= &w1_master_release
153 struct device_driver w1_slave_driver
= {
154 .name
= "w1_slave_driver",
158 struct device w1_slave_device
= {
161 .bus_id
= "w1 bus slave",
162 .driver
= &w1_slave_driver
,
165 static ssize_t
w1_master_attribute_show_name(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
167 struct w1_master
*md
= dev_to_w1_master(dev
);
170 if (down_interruptible (&md
->mutex
))
173 count
= sprintf(buf
, "%s\n", md
->name
);
180 static ssize_t
w1_master_attribute_store_search(struct device
* dev
,
181 struct device_attribute
*attr
,
182 const char * buf
, size_t count
)
184 struct w1_master
*md
= dev_to_w1_master(dev
);
186 if (down_interruptible (&md
->mutex
))
189 md
->search_count
= simple_strtol(buf
, NULL
, 0);
196 static ssize_t
w1_master_attribute_show_search(struct device
*dev
,
197 struct device_attribute
*attr
,
200 struct w1_master
*md
= dev_to_w1_master(dev
);
203 if (down_interruptible (&md
->mutex
))
206 count
= sprintf(buf
, "%d\n", md
->search_count
);
213 static ssize_t
w1_master_attribute_show_pointer(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
215 struct w1_master
*md
= dev_to_w1_master(dev
);
218 if (down_interruptible(&md
->mutex
))
221 count
= sprintf(buf
, "0x%p\n", md
->bus_master
);
227 static ssize_t
w1_master_attribute_show_timeout(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
230 count
= sprintf(buf
, "%d\n", w1_timeout
);
234 static ssize_t
w1_master_attribute_show_max_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
236 struct w1_master
*md
= dev_to_w1_master(dev
);
239 if (down_interruptible(&md
->mutex
))
242 count
= sprintf(buf
, "%d\n", md
->max_slave_count
);
248 static ssize_t
w1_master_attribute_show_attempts(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
250 struct w1_master
*md
= dev_to_w1_master(dev
);
253 if (down_interruptible(&md
->mutex
))
256 count
= sprintf(buf
, "%lu\n", md
->attempts
);
262 static ssize_t
w1_master_attribute_show_slave_count(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
264 struct w1_master
*md
= dev_to_w1_master(dev
);
267 if (down_interruptible(&md
->mutex
))
270 count
= sprintf(buf
, "%d\n", md
->slave_count
);
276 static ssize_t
w1_master_attribute_show_slaves(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
278 struct w1_master
*md
= dev_to_w1_master(dev
);
281 if (down_interruptible(&md
->mutex
))
284 if (md
->slave_count
== 0)
285 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "not found.\n");
287 struct list_head
*ent
, *n
;
290 list_for_each_safe(ent
, n
, &md
->slist
) {
291 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
293 c
-= snprintf(buf
+ PAGE_SIZE
- c
, c
, "%s\n", sl
->name
);
299 return PAGE_SIZE
- c
;
302 #define W1_MASTER_ATTR_RO(_name, _mode) \
303 struct device_attribute w1_master_attribute_##_name = \
304 __ATTR(w1_master_##_name, _mode, \
305 w1_master_attribute_show_##_name, NULL)
307 #define W1_MASTER_ATTR_RW(_name, _mode) \
308 struct device_attribute w1_master_attribute_##_name = \
309 __ATTR(w1_master_##_name, _mode, \
310 w1_master_attribute_show_##_name, \
311 w1_master_attribute_store_##_name)
313 static W1_MASTER_ATTR_RO(name
, S_IRUGO
);
314 static W1_MASTER_ATTR_RO(slaves
, S_IRUGO
);
315 static W1_MASTER_ATTR_RO(slave_count
, S_IRUGO
);
316 static W1_MASTER_ATTR_RO(max_slave_count
, S_IRUGO
);
317 static W1_MASTER_ATTR_RO(attempts
, S_IRUGO
);
318 static W1_MASTER_ATTR_RO(timeout
, S_IRUGO
);
319 static W1_MASTER_ATTR_RO(pointer
, S_IRUGO
);
320 static W1_MASTER_ATTR_RW(search
, S_IRUGO
| S_IWUGO
);
322 static struct attribute
*w1_master_default_attrs
[] = {
323 &w1_master_attribute_name
.attr
,
324 &w1_master_attribute_slaves
.attr
,
325 &w1_master_attribute_slave_count
.attr
,
326 &w1_master_attribute_max_slave_count
.attr
,
327 &w1_master_attribute_attempts
.attr
,
328 &w1_master_attribute_timeout
.attr
,
329 &w1_master_attribute_pointer
.attr
,
330 &w1_master_attribute_search
.attr
,
334 static struct attribute_group w1_master_defattr_group
= {
335 .attrs
= w1_master_default_attrs
,
338 int w1_create_master_attributes(struct w1_master
*master
)
340 return sysfs_create_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
343 void w1_destroy_master_attributes(struct w1_master
*master
)
345 sysfs_remove_group(&master
->dev
.kobj
, &w1_master_defattr_group
);
348 #ifdef CONFIG_HOTPLUG
349 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
351 struct w1_master
*md
= NULL
;
352 struct w1_slave
*sl
= NULL
;
353 char *event_owner
, *name
;
354 int err
, cur_index
=0, cur_len
=0;
356 if (dev
->driver
== &w1_master_driver
) {
357 md
= container_of(dev
, struct w1_master
, dev
);
358 event_owner
= "master";
360 } else if (dev
->driver
== &w1_slave_driver
) {
361 sl
= container_of(dev
, struct w1_slave
, dev
);
362 event_owner
= "slave";
365 dev_dbg(dev
, "Unknown hotplug event.\n");
369 dev_dbg(dev
, "Hotplug event for %s %s, bus_id=%s.\n", event_owner
, name
, dev
->bus_id
);
371 if (dev
->driver
!= &w1_slave_driver
|| !sl
)
374 err
= add_hotplug_env_var(envp
, num_envp
, &cur_index
, buffer
, buffer_size
, &cur_len
, "W1_FID=%02X", sl
->reg_num
.family
);
378 err
= add_hotplug_env_var(envp
, num_envp
, &cur_index
, buffer
, buffer_size
, &cur_len
, "W1_SLAVE_ID=%024LX", (u64
)sl
->reg_num
.id
);
385 static int w1_hotplug(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
391 static int __w1_attach_slave_device(struct w1_slave
*sl
)
395 sl
->dev
.parent
= &sl
->master
->dev
;
396 sl
->dev
.driver
= &w1_slave_driver
;
397 sl
->dev
.bus
= &w1_bus_type
;
398 sl
->dev
.release
= &w1_slave_release
;
400 snprintf(&sl
->dev
.bus_id
[0], sizeof(sl
->dev
.bus_id
),
402 (unsigned int) sl
->reg_num
.family
,
403 (unsigned long long) sl
->reg_num
.id
);
404 snprintf(&sl
->name
[0], sizeof(sl
->name
),
406 (unsigned int) sl
->reg_num
.family
,
407 (unsigned long long) sl
->reg_num
.id
);
409 dev_dbg(&sl
->dev
, "%s: registering %s.\n", __func__
,
412 err
= device_register(&sl
->dev
);
415 "Device registration [%s] failed. err=%d\n",
416 sl
->dev
.bus_id
, err
);
420 /* Create "name" entry */
421 err
= device_create_file(&sl
->dev
, &w1_slave_attr_name
);
424 "sysfs file creation for [%s] failed. err=%d\n",
425 sl
->dev
.bus_id
, err
);
429 /* Create "id" entry */
430 err
= sysfs_create_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
433 "sysfs file creation for [%s] failed. err=%d\n",
434 sl
->dev
.bus_id
, err
);
438 /* if the family driver needs to initialize something... */
439 if (sl
->family
->fops
&& sl
->family
->fops
->add_slave
&&
440 ((err
= sl
->family
->fops
->add_slave(sl
)) < 0)) {
442 "sysfs file creation for [%s] failed. err=%d\n",
443 sl
->dev
.bus_id
, err
);
447 list_add_tail(&sl
->w1_slave_entry
, &sl
->master
->slist
);
452 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
454 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
456 device_unregister(&sl
->dev
);
460 static int w1_attach_slave_device(struct w1_master
*dev
, struct w1_reg_num
*rn
)
465 struct w1_netlink_msg msg
;
467 sl
= kmalloc(sizeof(struct w1_slave
), GFP_KERNEL
);
470 "%s: failed to allocate new slave device.\n",
475 memset(sl
, 0, sizeof(*sl
));
477 sl
->owner
= THIS_MODULE
;
479 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
481 memcpy(&sl
->reg_num
, rn
, sizeof(sl
->reg_num
));
482 atomic_set(&sl
->refcnt
, 0);
483 init_completion(&sl
->dev_released
);
485 spin_lock(&w1_flock
);
486 f
= w1_family_registered(rn
->family
);
488 f
= &w1_default_family
;
489 dev_info(&dev
->dev
, "Family %x for %02x.%012llx.%02x is not registered.\n",
490 rn
->family
, rn
->family
,
491 (unsigned long long)rn
->id
, rn
->crc
);
494 spin_unlock(&w1_flock
);
499 err
= __w1_attach_slave_device(sl
);
501 dev_err(&dev
->dev
, "%s: Attaching %s failed.\n", __func__
,
503 w1_family_put(sl
->family
);
508 sl
->ttl
= dev
->slave_ttl
;
511 memcpy(&msg
.id
.id
, rn
, sizeof(msg
.id
.id
));
512 msg
.type
= W1_SLAVE_ADD
;
513 w1_netlink_send(dev
, &msg
);
518 static void w1_slave_detach(struct w1_slave
*sl
)
520 struct w1_netlink_msg msg
;
522 dev_info(&sl
->dev
, "%s: detaching %s.\n", __func__
, sl
->name
);
524 while (atomic_read(&sl
->refcnt
)) {
525 printk(KERN_INFO
"Waiting for %s to become free: refcnt=%d.\n",
526 sl
->name
, atomic_read(&sl
->refcnt
));
528 if (msleep_interruptible(1000))
529 flush_signals(current
);
532 if (sl
->family
->fops
&& sl
->family
->fops
->remove_slave
)
533 sl
->family
->fops
->remove_slave(sl
);
535 sysfs_remove_bin_file(&sl
->dev
.kobj
, &w1_slave_attr_bin_id
);
536 device_remove_file(&sl
->dev
, &w1_slave_attr_name
);
537 device_unregister(&sl
->dev
);
538 w1_family_put(sl
->family
);
540 sl
->master
->slave_count
--;
542 memcpy(&msg
.id
.id
, &sl
->reg_num
, sizeof(msg
.id
.id
));
543 msg
.type
= W1_SLAVE_REMOVE
;
544 w1_netlink_send(sl
->master
, &msg
);
547 static struct w1_master
*w1_search_master(unsigned long data
)
549 struct w1_master
*dev
;
552 spin_lock_bh(&w1_mlock
);
553 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
554 if (dev
->bus_master
->data
== data
) {
556 atomic_inc(&dev
->refcnt
);
560 spin_unlock_bh(&w1_mlock
);
562 return (found
)?dev
:NULL
;
565 void w1_reconnect_slaves(struct w1_family
*f
)
567 struct w1_master
*dev
;
569 spin_lock_bh(&w1_mlock
);
570 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
571 dev_info(&dev
->dev
, "Reconnecting slaves in %s into new family %02x.\n",
573 set_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
);
575 spin_unlock_bh(&w1_mlock
);
578 static void w1_slave_found(unsigned long data
, u64 rn
)
582 struct list_head
*ent
;
583 struct w1_reg_num
*tmp
;
584 int family_found
= 0;
585 struct w1_master
*dev
;
586 u64 rn_le
= cpu_to_le64(rn
);
588 dev
= w1_search_master(data
);
590 printk(KERN_ERR
"Failed to find w1 master device for data %08lx, it is impossible.\n",
595 tmp
= (struct w1_reg_num
*) &rn
;
598 list_for_each(ent
, &dev
->slist
) {
600 sl
= list_entry(ent
, struct w1_slave
, w1_slave_entry
);
602 if (sl
->reg_num
.family
== tmp
->family
&&
603 sl
->reg_num
.id
== tmp
->id
&&
604 sl
->reg_num
.crc
== tmp
->crc
) {
605 set_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
607 } else if (sl
->reg_num
.family
== tmp
->family
) {
615 if (slave_count
== dev
->slave_count
&&
616 rn
&& ((rn
>> 56) & 0xff) == w1_calc_crc8((u8
*)&rn_le
, 7)) {
617 w1_attach_slave_device(dev
, tmp
);
620 atomic_dec(&dev
->refcnt
);
624 * Performs a ROM Search & registers any devices found.
625 * The 1-wire search is a simple binary tree search.
626 * For each bit of the address, we read two bits and write one bit.
627 * The bit written will put to sleep all devies that don't match that bit.
628 * When the two reads differ, the direction choice is obvious.
629 * When both bits are 0, we must choose a path to take.
630 * When we can scan all 64 bits without having to choose a path, we are done.
632 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
634 * @dev The master device to search
635 * @cb Function to call when a device is found
637 void w1_search(struct w1_master
*dev
, w1_slave_found_callback cb
)
639 u64 last_rn
, rn
, tmp64
;
640 int i
, slave_count
= 0;
641 int last_zero
, last_device
;
642 int search_bit
, desc_bit
;
652 while ( !last_device
&& (slave_count
++ < dev
->max_slave_count
) ) {
657 * Reset bus and all 1-wire device state machines
658 * so they can respond to our requests.
660 * Return 0 - device(s) present, 1 - no devices present.
662 if (w1_reset_bus(dev
)) {
663 dev_dbg(&dev
->dev
, "No devices present on the wire.\n");
667 /* Start the search */
668 w1_write_8(dev
, W1_SEARCH
);
669 for (i
= 0; i
< 64; ++i
) {
670 /* Determine the direction/search bit */
672 search_bit
= 1; /* took the 0 path last time, so take the 1 path */
673 else if (i
> desc_bit
)
674 search_bit
= 0; /* take the 0 path on the next branch */
676 search_bit
= ((last_rn
>> i
) & 0x1);
678 /** Read two bits and write one bit */
679 triplet_ret
= w1_triplet(dev
, search_bit
);
681 /* quit if no device responded */
682 if ( (triplet_ret
& 0x03) == 0x03 )
685 /* If both directions were valid, and we took the 0 path... */
686 if (triplet_ret
== 0)
689 /* extract the direction taken & update the device number */
690 tmp64
= (triplet_ret
>> 2);
694 if ( (triplet_ret
& 0x03) != 0x03 ) {
695 if ( (desc_bit
== last_zero
) || (last_zero
< 0))
697 desc_bit
= last_zero
;
698 cb(dev
->bus_master
->data
, rn
);
703 static int w1_control(void *data
)
705 struct w1_slave
*sl
, *sln
;
706 struct w1_master
*dev
, *n
;
707 int err
, have_to_wait
= 0;
709 daemonize("w1_control");
710 allow_signal(SIGTERM
);
712 while (!control_needs_exit
|| have_to_wait
) {
716 msleep_interruptible(w1_timeout
* 1000);
718 if (signal_pending(current
))
719 flush_signals(current
);
721 list_for_each_entry_safe(dev
, n
, &w1_masters
, w1_master_entry
) {
722 if (!control_needs_exit
&& !dev
->flags
)
725 * Little race: we can create thread but not set the flag.
726 * Get a chance for external process to set flag up.
728 if (!dev
->initialized
) {
733 if (control_needs_exit
) {
734 set_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
);
736 err
= kill_proc(dev
->kpid
, SIGTERM
, 1);
739 "Failed to send signal to w1 kernel thread %d.\n",
743 if (test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
)) {
744 wait_for_completion(&dev
->dev_exited
);
745 spin_lock_bh(&w1_mlock
);
746 list_del(&dev
->w1_master_entry
);
747 spin_unlock_bh(&w1_mlock
);
749 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
750 list_del(&sl
->w1_slave_entry
);
755 w1_destroy_master_attributes(dev
);
756 atomic_dec(&dev
->refcnt
);
760 if (test_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
)) {
761 dev_info(&dev
->dev
, "Reconnecting slaves in device %s.\n", dev
->name
);
763 list_for_each_entry(sl
, &dev
->slist
, w1_slave_entry
) {
764 if (sl
->family
->fid
== W1_FAMILY_DEFAULT
) {
765 struct w1_reg_num rn
;
766 list_del(&sl
->w1_slave_entry
);
769 memcpy(&rn
, &sl
->reg_num
, sizeof(rn
));
773 w1_attach_slave_device(dev
, &rn
);
776 clear_bit(W1_MASTER_NEED_RECONNECT
, &dev
->flags
);
782 complete_and_exit(&w1_control_complete
, 0);
785 int w1_process(void *data
)
787 struct w1_master
*dev
= (struct w1_master
*) data
;
788 struct w1_slave
*sl
, *sln
;
790 daemonize("%s", dev
->name
);
791 allow_signal(SIGTERM
);
793 while (!test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
)) {
795 msleep_interruptible(w1_timeout
* 1000);
797 if (signal_pending(current
))
798 flush_signals(current
);
800 if (test_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
))
803 if (!dev
->initialized
)
806 if (dev
->search_count
== 0)
809 if (down_interruptible(&dev
->mutex
))
812 list_for_each_entry(sl
, &dev
->slist
, w1_slave_entry
)
813 clear_bit(W1_SLAVE_ACTIVE
, (long *)&sl
->flags
);
815 w1_search_devices(dev
, w1_slave_found
);
817 list_for_each_entry_safe(sl
, sln
, &dev
->slist
, w1_slave_entry
) {
818 if (!test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
) && !--sl
->ttl
) {
819 list_del (&sl
->w1_slave_entry
);
825 } else if (test_bit(W1_SLAVE_ACTIVE
, (unsigned long *)&sl
->flags
))
826 sl
->ttl
= dev
->slave_ttl
;
829 if (dev
->search_count
> 0)
835 atomic_dec(&dev
->refcnt
);
836 complete_and_exit(&dev
->dev_exited
, 0);
841 static int w1_init(void)
845 printk(KERN_INFO
"Driver for 1-wire Dallas network protocol.\n");
847 retval
= bus_register(&w1_bus_type
);
849 printk(KERN_ERR
"Failed to register bus. err=%d.\n", retval
);
850 goto err_out_exit_init
;
853 retval
= driver_register(&w1_master_driver
);
856 "Failed to register master driver. err=%d.\n",
858 goto err_out_bus_unregister
;
861 retval
= driver_register(&w1_slave_driver
);
864 "Failed to register master driver. err=%d.\n",
866 goto err_out_master_unregister
;
869 control_thread
= kernel_thread(&w1_control
, NULL
, 0);
870 if (control_thread
< 0) {
871 printk(KERN_ERR
"Failed to create control thread. err=%d\n",
873 retval
= control_thread
;
874 goto err_out_slave_unregister
;
879 err_out_slave_unregister
:
880 driver_unregister(&w1_slave_driver
);
882 err_out_master_unregister
:
883 driver_unregister(&w1_master_driver
);
885 err_out_bus_unregister
:
886 bus_unregister(&w1_bus_type
);
892 static void w1_fini(void)
894 struct w1_master
*dev
;
896 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
)
897 __w1_remove_master_device(dev
);
899 control_needs_exit
= 1;
900 wait_for_completion(&w1_control_complete
);
902 driver_unregister(&w1_slave_driver
);
903 driver_unregister(&w1_master_driver
);
904 bus_unregister(&w1_bus_type
);
907 module_init(w1_init
);
908 module_exit(w1_fini
);