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/debugfs.h>
20 #include <linux/uwb.h>
21
22 #include "uwb-internal.h"
23
24 /**
25 * uwb_pal_init - initialize a UWB PAL
26 * @pal: the PAL to initialize
27 */
uwb_pal_init(struct uwb_pal * pal)28 void uwb_pal_init(struct uwb_pal *pal)
29 {
30 INIT_LIST_HEAD(&pal->node);
31 }
32 EXPORT_SYMBOL_GPL(uwb_pal_init);
33
34 /**
35 * uwb_pal_register - register a UWB PAL
36 * @pal: the PAL
37 *
38 * The PAL must be initialized with uwb_pal_init().
39 */
uwb_pal_register(struct uwb_pal * pal)40 int uwb_pal_register(struct uwb_pal *pal)
41 {
42 struct uwb_rc *rc = pal->rc;
43 int ret;
44
45 if (pal->device) {
46 ret = sysfs_create_link(&pal->device->kobj,
47 &rc->uwb_dev.dev.kobj, "uwb_rc");
48 if (ret < 0)
49 return ret;
50 ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
51 &pal->device->kobj, pal->name);
52 if (ret < 0) {
53 sysfs_remove_link(&pal->device->kobj, "uwb_rc");
54 return ret;
55 }
56 }
57
58 pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
59
60 mutex_lock(&rc->uwb_dev.mutex);
61 list_add(&pal->node, &rc->pals);
62 mutex_unlock(&rc->uwb_dev.mutex);
63
64 return 0;
65 }
66 EXPORT_SYMBOL_GPL(uwb_pal_register);
67
68 /**
69 * uwb_pal_register - unregister a UWB PAL
70 * @pal: the PAL
71 */
uwb_pal_unregister(struct uwb_pal * pal)72 void uwb_pal_unregister(struct uwb_pal *pal)
73 {
74 struct uwb_rc *rc = pal->rc;
75
76 uwb_radio_stop(pal);
77
78 mutex_lock(&rc->uwb_dev.mutex);
79 list_del(&pal->node);
80 mutex_unlock(&rc->uwb_dev.mutex);
81
82 debugfs_remove(pal->debugfs_dir);
83
84 if (pal->device) {
85 sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
86 sysfs_remove_link(&pal->device->kobj, "uwb_rc");
87 }
88 }
89 EXPORT_SYMBOL_GPL(uwb_pal_unregister);
90
91 /**
92 * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
93 * @rc: the radio controller
94 */
uwb_rc_pal_init(struct uwb_rc * rc)95 void uwb_rc_pal_init(struct uwb_rc *rc)
96 {
97 INIT_LIST_HEAD(&rc->pals);
98 }
99