summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/rt2x00/rt2x00rfkill.c
blob: 04b29716d356a0f0dbc158c13529a8ccf9cb9ffb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt2x00rfkill
	Abstract: rt2x00 rfkill routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rfkill.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

static int rt2x00rfkill_toggle_radio(void *data, enum rfkill_state state)
{
	struct rt2x00_dev *rt2x00dev = data;
	int retval = 0;

	if (unlikely(!rt2x00dev))
		return 0;

	/*
	 * Only continue if there are enabled interfaces.
	 */
	if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
		return 0;

	if (state == RFKILL_STATE_UNBLOCKED) {
		INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
		__clear_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
		retval = rt2x00lib_enable_radio(rt2x00dev);
	} else if (state == RFKILL_STATE_SOFT_BLOCKED) {
		INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
		__set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
		rt2x00lib_disable_radio(rt2x00dev);
	} else {
		WARNING(rt2x00dev, "Received unexpected rfkill state %d.\n",
			state);
	}

	return retval;
}

static int rt2x00rfkill_get_state(void *data, enum rfkill_state *state)
{
	struct rt2x00_dev *rt2x00dev = data;

	*state = rt2x00dev->rfkill->state;

	return 0;
}

static void rt2x00rfkill_poll(struct work_struct *work)
{
	struct rt2x00_dev *rt2x00dev =
	    container_of(work, struct rt2x00_dev, rfkill_work.work);
	int state;

	if (!test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
		return;

	/*
	 * rfkill_poll reports 1 when the key has been pressed and the
	 * radio should be blocked.
	 */
	state = !rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ?
	    RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;

	rfkill_force_state(rt2x00dev->rfkill, state);

	queue_delayed_work(rt2x00dev->hw->workqueue,
			   &rt2x00dev->rfkill_work, RFKILL_POLL_INTERVAL);
}

void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
	    !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
		return;

	if (rfkill_register(rt2x00dev->rfkill)) {
		ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
		return;
	}

	__set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);

	/*
	 * Force initial poll which will detect the initial device state,
	 * and correctly sends the signal to the rfkill layer about this
	 * state.
	 */
	rt2x00rfkill_poll(&rt2x00dev->rfkill_work.work);
}

void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
	    !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
		return;

	cancel_delayed_work_sync(&rt2x00dev->rfkill_work);

	rfkill_unregister(rt2x00dev->rfkill);

	__clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
}

void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
		return;

	rt2x00dev->rfkill =
	    rfkill_allocate(wiphy_dev(rt2x00dev->hw->wiphy), RFKILL_TYPE_WLAN);
	if (!rt2x00dev->rfkill) {
		ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
		return;
	}

	rt2x00dev->rfkill->name = rt2x00dev->ops->name;
	rt2x00dev->rfkill->data = rt2x00dev;
	rt2x00dev->rfkill->state = -1;
	rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
	rt2x00dev->rfkill->get_state = rt2x00rfkill_get_state;

	INIT_DELAYED_WORK(&rt2x00dev->rfkill_work, rt2x00rfkill_poll);

	return;
}

void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
	    !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
		return;

	cancel_delayed_work_sync(&rt2x00dev->rfkill_work);

	rfkill_free(rt2x00dev->rfkill);
	rt2x00dev->rfkill = NULL;
}