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 #include <linux/export.h>
22 
23 #include "uwb-internal.h"
24 
25 /**
26  * uwb_pal_init - initialize a UWB PAL
27  * @pal: the PAL to initialize
28  */
uwb_pal_init(struct uwb_pal * pal)29 void uwb_pal_init(struct uwb_pal *pal)
30 {
31 	INIT_LIST_HEAD(&pal->node);
32 }
33 EXPORT_SYMBOL_GPL(uwb_pal_init);
34 
35 /**
36  * uwb_pal_register - register a UWB PAL
37  * @pal: the PAL
38  *
39  * The PAL must be initialized with uwb_pal_init().
40  */
uwb_pal_register(struct uwb_pal * pal)41 int uwb_pal_register(struct uwb_pal *pal)
42 {
43 	struct uwb_rc *rc = pal->rc;
44 	int ret;
45 
46 	if (pal->device) {
47 		ret = sysfs_create_link(&pal->device->kobj,
48 					&rc->uwb_dev.dev.kobj, "uwb_rc");
49 		if (ret < 0)
50 			return ret;
51 		ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
52 					&pal->device->kobj, pal->name);
53 		if (ret < 0) {
54 			sysfs_remove_link(&pal->device->kobj, "uwb_rc");
55 			return ret;
56 		}
57 	}
58 
59 	pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
60 
61 	mutex_lock(&rc->uwb_dev.mutex);
62 	list_add(&pal->node, &rc->pals);
63 	mutex_unlock(&rc->uwb_dev.mutex);
64 
65 	return 0;
66 }
67 EXPORT_SYMBOL_GPL(uwb_pal_register);
68 
69 /**
70  * uwb_pal_register - unregister a UWB PAL
71  * @pal: the PAL
72  */
uwb_pal_unregister(struct uwb_pal * pal)73 void uwb_pal_unregister(struct uwb_pal *pal)
74 {
75 	struct uwb_rc *rc = pal->rc;
76 
77 	uwb_radio_stop(pal);
78 
79 	mutex_lock(&rc->uwb_dev.mutex);
80 	list_del(&pal->node);
81 	mutex_unlock(&rc->uwb_dev.mutex);
82 
83 	debugfs_remove(pal->debugfs_dir);
84 
85 	if (pal->device) {
86 		sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
87 		sysfs_remove_link(&pal->device->kobj, "uwb_rc");
88 	}
89 }
90 EXPORT_SYMBOL_GPL(uwb_pal_unregister);
91 
92 /**
93  * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
94  * @rc: the radio controller
95  */
uwb_rc_pal_init(struct uwb_rc * rc)96 void uwb_rc_pal_init(struct uwb_rc *rc)
97 {
98 	INIT_LIST_HEAD(&rc->pals);
99 }
100