uwb: don't use printk_ratelimit() so often
[safe/jmp/linux-2.6] / drivers / uwb / pal.c
1 /*
2  * UWB PAL support.
3  *
4  * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License version
8  * 2 as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18 #include <linux/kernel.h>
19 #include <linux/uwb.h>
20
21 #include "uwb-internal.h"
22
23 /**
24  * uwb_pal_init - initialize a UWB PAL
25  * @pal: the PAL to initialize
26  */
27 void uwb_pal_init(struct uwb_pal *pal)
28 {
29         INIT_LIST_HEAD(&pal->node);
30 }
31 EXPORT_SYMBOL_GPL(uwb_pal_init);
32
33 /**
34  * uwb_pal_register - register a UWB PAL
35  * @rc: the radio controller the PAL will be using
36  * @pal: the PAL
37  *
38  * The PAL must be initialized with uwb_pal_init().
39  */
40 int uwb_pal_register(struct uwb_rc *rc, struct uwb_pal *pal)
41 {
42         int ret;
43
44         if (pal->device) {
45                 ret = sysfs_create_link(&pal->device->kobj,
46                                         &rc->uwb_dev.dev.kobj, "uwb_rc");
47                 if (ret < 0)
48                         return ret;
49                 ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
50                                         &pal->device->kobj, pal->name);
51                 if (ret < 0) {
52                         sysfs_remove_link(&pal->device->kobj, "uwb_rc");
53                         return ret;
54                 }
55         }
56
57         spin_lock(&rc->pal_lock);
58         list_add(&pal->node, &rc->pals);
59         spin_unlock(&rc->pal_lock);
60
61         return 0;
62 }
63 EXPORT_SYMBOL_GPL(uwb_pal_register);
64
65 /**
66  * uwb_pal_register - unregister a UWB PAL
67  * @rc: the radio controller the PAL was using
68  * @pal: the PAL
69  */
70 void uwb_pal_unregister(struct uwb_rc *rc, struct uwb_pal *pal)
71 {
72         spin_lock(&rc->pal_lock);
73         list_del(&pal->node);
74         spin_unlock(&rc->pal_lock);
75
76         if (pal->device) {
77                 sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
78                 sysfs_remove_link(&pal->device->kobj, "uwb_rc");
79         }
80 }
81 EXPORT_SYMBOL_GPL(uwb_pal_unregister);
82
83 /**
84  * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
85  * @rc: the radio controller
86  */
87 void uwb_rc_pal_init(struct uwb_rc *rc)
88 {
89         spin_lock_init(&rc->pal_lock);
90         INIT_LIST_HEAD(&rc->pals);
91 }