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1 | /* |
2 | * w1_family.c |
3 | * |
4 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
5 | * |
6 | * |
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. |
11 | * |
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. |
16 | * |
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 |
20 | */ |
21 | |
22 | #include <linux/spinlock.h> |
23 | #include <linux/list.h> |
24 | #include <linux/sched.h> /* schedule_timeout() */ |
25 | #include <linux/delay.h> |
26 | #include <linux/export.h> |
27 | |
28 | #include "w1_family.h" |
29 | #include "w1.h" |
30 | |
31 | DEFINE_SPINLOCK(w1_flock); |
32 | static LIST_HEAD(w1_families); |
33 | |
34 | int w1_register_family(struct w1_family *newf) |
35 | { |
36 | struct list_head *ent, *n; |
37 | struct w1_family *f; |
38 | int ret = 0; |
39 | |
40 | spin_lock(&w1_flock); |
41 | list_for_each_safe(ent, n, &w1_families) { |
42 | f = list_entry(ent, struct w1_family, family_entry); |
43 | |
44 | if (f->fid == newf->fid) { |
45 | ret = -EEXIST; |
46 | break; |
47 | } |
48 | } |
49 | |
50 | if (!ret) { |
51 | atomic_set(&newf->refcnt, 0); |
52 | list_add_tail(&newf->family_entry, &w1_families); |
53 | } |
54 | spin_unlock(&w1_flock); |
55 | |
56 | /* check default devices against the new set of drivers */ |
57 | w1_reconnect_slaves(newf, 1); |
58 | |
59 | return ret; |
60 | } |
61 | |
62 | void w1_unregister_family(struct w1_family *fent) |
63 | { |
64 | struct list_head *ent, *n; |
65 | struct w1_family *f; |
66 | |
67 | spin_lock(&w1_flock); |
68 | list_for_each_safe(ent, n, &w1_families) { |
69 | f = list_entry(ent, struct w1_family, family_entry); |
70 | |
71 | if (f->fid == fent->fid) { |
72 | list_del(&fent->family_entry); |
73 | break; |
74 | } |
75 | } |
76 | spin_unlock(&w1_flock); |
77 | |
78 | /* deatch devices using this family code */ |
79 | w1_reconnect_slaves(fent, 0); |
80 | |
81 | while (atomic_read(&fent->refcnt)) { |
82 | printk(KERN_INFO "Waiting for family %u to become free: refcnt=%d.\n", |
83 | fent->fid, atomic_read(&fent->refcnt)); |
84 | |
85 | if (msleep_interruptible(1000)) |
86 | flush_signals(current); |
87 | } |
88 | } |
89 | |
90 | /* |
91 | * Should be called under w1_flock held. |
92 | */ |
93 | struct w1_family * w1_family_registered(u8 fid) |
94 | { |
95 | struct list_head *ent, *n; |
96 | struct w1_family *f = NULL; |
97 | int ret = 0; |
98 | |
99 | list_for_each_safe(ent, n, &w1_families) { |
100 | f = list_entry(ent, struct w1_family, family_entry); |
101 | |
102 | if (f->fid == fid) { |
103 | ret = 1; |
104 | break; |
105 | } |
106 | } |
107 | |
108 | return (ret) ? f : NULL; |
109 | } |
110 | |
111 | static void __w1_family_put(struct w1_family *f) |
112 | { |
113 | atomic_dec(&f->refcnt); |
114 | } |
115 | |
116 | void w1_family_put(struct w1_family *f) |
117 | { |
118 | spin_lock(&w1_flock); |
119 | __w1_family_put(f); |
120 | spin_unlock(&w1_flock); |
121 | } |
122 | |
123 | #if 0 |
124 | void w1_family_get(struct w1_family *f) |
125 | { |
126 | spin_lock(&w1_flock); |
127 | __w1_family_get(f); |
128 | spin_unlock(&w1_flock); |
129 | } |
130 | #endif /* 0 */ |
131 | |
132 | void __w1_family_get(struct w1_family *f) |
133 | { |
134 | smp_mb__before_atomic_inc(); |
135 | atomic_inc(&f->refcnt); |
136 | smp_mb__after_atomic_inc(); |
137 | } |
138 | |
139 | EXPORT_SYMBOL(w1_unregister_family); |
140 | EXPORT_SYMBOL(w1_register_family); |
141 |
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