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 */
28void uwb_pal_init(struct uwb_pal *pal)
29{
30	INIT_LIST_HEAD(&pal->node);
31}
32EXPORT_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 */
40int 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}
66EXPORT_SYMBOL_GPL(uwb_pal_register);
67
68/**
69 * uwb_pal_register - unregister a UWB PAL
70 * @pal: the PAL
71 */
72void 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}
89EXPORT_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 */
95void uwb_rc_pal_init(struct uwb_rc *rc)
96{
97	INIT_LIST_HEAD(&rc->pals);
98}