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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/w1/w1_family.c
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/spinlock.h>
23 #include <linux/list.h>
24 #include <linux/sched.h> /* schedule_timeout() */
25 #include <linux/delay.h>
27 #include "w1_family.h"
30 DEFINE_SPINLOCK(w1_flock
);
31 static LIST_HEAD(w1_families
);
33 int w1_register_family(struct w1_family
*newf
)
35 struct list_head
*ent
, *n
;
40 list_for_each_safe(ent
, n
, &w1_families
) {
41 f
= list_entry(ent
, struct w1_family
, family_entry
);
43 if (f
->fid
== newf
->fid
) {
50 atomic_set(&newf
->refcnt
, 0);
51 list_add_tail(&newf
->family_entry
, &w1_families
);
53 spin_unlock(&w1_flock
);
55 /* check default devices against the new set of drivers */
56 w1_reconnect_slaves(newf
, 1);
61 void w1_unregister_family(struct w1_family
*fent
)
63 struct list_head
*ent
, *n
;
67 list_for_each_safe(ent
, n
, &w1_families
) {
68 f
= list_entry(ent
, struct w1_family
, family_entry
);
70 if (f
->fid
== fent
->fid
) {
71 list_del(&fent
->family_entry
);
75 spin_unlock(&w1_flock
);
77 /* deatch devices using this family code */
78 w1_reconnect_slaves(fent
, 0);
80 while (atomic_read(&fent
->refcnt
)) {
81 printk(KERN_INFO
"Waiting for family %u to become free: refcnt=%d.\n",
82 fent
->fid
, atomic_read(&fent
->refcnt
));
84 if (msleep_interruptible(1000))
85 flush_signals(current
);
90 * Should be called under w1_flock held.
92 struct w1_family
* w1_family_registered(u8 fid
)
94 struct list_head
*ent
, *n
;
95 struct w1_family
*f
= NULL
;
98 list_for_each_safe(ent
, n
, &w1_families
) {
99 f
= list_entry(ent
, struct w1_family
, family_entry
);
107 return (ret
) ? f
: NULL
;
110 static void __w1_family_put(struct w1_family
*f
)
112 atomic_dec(&f
->refcnt
);
115 void w1_family_put(struct w1_family
*f
)
117 spin_lock(&w1_flock
);
119 spin_unlock(&w1_flock
);
123 void w1_family_get(struct w1_family
*f
)
125 spin_lock(&w1_flock
);
127 spin_unlock(&w1_flock
);
131 void __w1_family_get(struct w1_family
*f
)
133 smp_mb__before_atomic_inc();
134 atomic_inc(&f
->refcnt
);
135 smp_mb__after_atomic_inc();
138 EXPORT_SYMBOL(w1_unregister_family
);
139 EXPORT_SYMBOL(w1_register_family
);