aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/rt2x00/rt2x00leds.c
blob: 68f4e0fc35b9e057043b8423a5e752c4e3eb2441 (plain) (blame)
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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
	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: rt2x00lib
	Abstract: rt2x00 led specific routines.
 */

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

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

void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
{
	struct rt2x00_led *led = &rt2x00dev->led_qual;
	unsigned int brightness;

	if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
		return;

	/*
	 * Led handling requires a positive value for the rssi,
	 * to do that correctly we need to add the correction.
	 */
	rssi += rt2x00dev->rssi_offset;

	/*
	 * Get the rssi level, this is used to convert the rssi
	 * to a LED value inside the range LED_OFF - LED_FULL.
	 */
	if (rssi <= 30)
		rssi = 0;
	else if (rssi <= 39)
		rssi = 1;
	else if (rssi <= 49)
		rssi = 2;
	else if (rssi <= 53)
		rssi = 3;
	else if (rssi <= 63)
		rssi = 4;
	else
		rssi = 5;

	/*
	 * Note that we must _not_ send LED_OFF since the driver
	 * is going to calculate the value and might use it in a
	 * division.
	 */
	brightness = ((LED_FULL / 6) * rssi) + 1;
	if (brightness != led->led_dev.brightness) {
		led->led_dev.brightness_set(&led->led_dev, brightness);
		led->led_dev.brightness = brightness;
	}
}

static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
{
	unsigned int brightness = enabled ? LED_FULL : LED_OFF;

	if (!(led->flags & LED_REGISTERED))
		return;

	led->led_dev.brightness_set(&led->led_dev, brightness);
	led->led_dev.brightness = brightness;
}

void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
		rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
}

void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
		rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
}

void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
{
	if (rt2x00dev->led_radio.type == LED_TYPE_ASSOC)
		rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
}

static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
				   struct rt2x00_led *led,
				   const char *name)
{
	struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
	int retval;

	led->led_dev.name = name;
	led->led_dev.brightness = LED_OFF;

	retval = led_classdev_register(device, &led->led_dev);
	if (retval) {
		ERROR(rt2x00dev, "Failed to register led handler.\n");
		return retval;
	}

	led->flags |= LED_REGISTERED;

	return 0;
}

void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
{
	char dev_name[16];
	char name[32];
	int retval;
	unsigned long on_period;
	unsigned long off_period;

	snprintf(dev_name, sizeof(dev_name), "%s-%s",
		 rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));

	if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s:radio", dev_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_radio,
						 name);
		if (retval)
			goto exit_fail;
	}

	if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s:assoc", dev_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_assoc,
						 name);
		if (retval)
			goto exit_fail;
	}

	if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
		snprintf(name, sizeof(name), "%s:quality", dev_name);

		retval = rt2x00leds_register_led(rt2x00dev,
						 &rt2x00dev->led_qual,
						 name);
		if (retval)
			goto exit_fail;
	}

	/*
	 * Initialize blink time to default value:
	 * On period: 70ms
	 * Off period: 30ms
	 */
	if (rt2x00dev->led_radio.led_dev.blink_set) {
		on_period = 70;
		off_period = 30;
		rt2x00dev->led_radio.led_dev.blink_set(
		    &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
	}

	return;

exit_fail:
	rt2x00leds_unregister(rt2x00dev);
}

static void rt2x00leds_unregister_led(struct rt2x00_led *led)
{
	led_classdev_unregister(&led->led_dev);

	/*
	 * This might look weird, but when we are unregistering while
	 * suspended the led is already off, and since we haven't
	 * fully resumed yet, access to the device might not be
	 * possible yet.
	 */
	if (!(led->led_dev.flags & LED_SUSPENDED))
		led->led_dev.brightness_set(&led->led_dev, LED_OFF);

	led->flags &= ~LED_REGISTERED;
}

void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_qual);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_unregister_led(&rt2x00dev->led_radio);
}

static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
{
	led_classdev_suspend(&led->led_dev);

	/* This shouldn't be needed, but just to be safe */
	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
	led->led_dev.brightness = LED_OFF;
}

void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_qual);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_suspend_led(&rt2x00dev->led_radio);
}

static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
{
	led_classdev_resume(&led->led_dev);

	/* Device might have enabled the LEDS during resume */
	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
	led->led_dev.brightness = LED_OFF;
}

void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
{
	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_radio);
	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_assoc);
	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
		rt2x00leds_resume_led(&rt2x00dev->led_qual);
}