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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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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9
