Merge git://git.kernel.org/pub/scm/linux/kernel/git/arjan/linux-2.6-async
[linux-2.6] / drivers / net / wireless / rt2x00 / rt2x00leds.c
1 /*
2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3         <http://rt2x00.serialmonkey.com>
4
5         This program is free software; you can redistribute it and/or modify
6         it under the terms of the GNU General Public License as published by
7         the Free Software Foundation; either version 2 of the License, or
8         (at your option) any later version.
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, write to the
17         Free Software Foundation, Inc.,
18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 /*
22         Module: rt2x00lib
23         Abstract: rt2x00 led specific routines.
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28
29 #include "rt2x00.h"
30 #include "rt2x00lib.h"
31
32 void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
33 {
34         struct rt2x00_led *led = &rt2x00dev->led_qual;
35         unsigned int brightness;
36
37         if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
38                 return;
39
40         /*
41          * Led handling requires a positive value for the rssi,
42          * to do that correctly we need to add the correction.
43          */
44         rssi += rt2x00dev->rssi_offset;
45
46         /*
47          * Get the rssi level, this is used to convert the rssi
48          * to a LED value inside the range LED_OFF - LED_FULL.
49          */
50         if (rssi <= 30)
51                 rssi = 0;
52         else if (rssi <= 39)
53                 rssi = 1;
54         else if (rssi <= 49)
55                 rssi = 2;
56         else if (rssi <= 53)
57                 rssi = 3;
58         else if (rssi <= 63)
59                 rssi = 4;
60         else
61                 rssi = 5;
62
63         /*
64          * Note that we must _not_ send LED_OFF since the driver
65          * is going to calculate the value and might use it in a
66          * division.
67          */
68         brightness = ((LED_FULL / 6) * rssi) + 1;
69         if (brightness != led->led_dev.brightness) {
70                 led->led_dev.brightness_set(&led->led_dev, brightness);
71                 led->led_dev.brightness = brightness;
72         }
73 }
74
75 static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
76 {
77         unsigned int brightness = enabled ? LED_FULL : LED_OFF;
78
79         if (!(led->flags & LED_REGISTERED))
80                 return;
81
82         led->led_dev.brightness_set(&led->led_dev, brightness);
83         led->led_dev.brightness = brightness;
84 }
85
86 void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
87 {
88         if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
89                 rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
90 }
91
92 void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
93 {
94         if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
95                 rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
96 }
97
98 void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
99 {
100         if (rt2x00dev->led_radio.type == LED_TYPE_ASSOC)
101                 rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
102 }
103
104 static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
105                                    struct rt2x00_led *led,
106                                    const char *name)
107 {
108         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
109         int retval;
110
111         led->led_dev.name = name;
112         led->led_dev.brightness = LED_OFF;
113
114         retval = led_classdev_register(device, &led->led_dev);
115         if (retval) {
116                 ERROR(rt2x00dev, "Failed to register led handler.\n");
117                 return retval;
118         }
119
120         led->flags |= LED_REGISTERED;
121
122         return 0;
123 }
124
125 void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
126 {
127         char dev_name[16];
128         char name[32];
129         int retval;
130         unsigned long on_period;
131         unsigned long off_period;
132
133         snprintf(dev_name, sizeof(dev_name), "%s-%s",
134                  rt2x00dev->ops->name, wiphy_name(rt2x00dev->hw->wiphy));
135
136         if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
137                 snprintf(name, sizeof(name), "%s:radio", dev_name);
138
139                 retval = rt2x00leds_register_led(rt2x00dev,
140                                                  &rt2x00dev->led_radio,
141                                                  name);
142                 if (retval)
143                         goto exit_fail;
144         }
145
146         if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
147                 snprintf(name, sizeof(name), "%s:assoc", dev_name);
148
149                 retval = rt2x00leds_register_led(rt2x00dev,
150                                                  &rt2x00dev->led_assoc,
151                                                  name);
152                 if (retval)
153                         goto exit_fail;
154         }
155
156         if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
157                 snprintf(name, sizeof(name), "%s:quality", dev_name);
158
159                 retval = rt2x00leds_register_led(rt2x00dev,
160                                                  &rt2x00dev->led_qual,
161                                                  name);
162                 if (retval)
163                         goto exit_fail;
164         }
165
166         /*
167          * Initialize blink time to default value:
168          * On period: 70ms
169          * Off period: 30ms
170          */
171         if (rt2x00dev->led_radio.led_dev.blink_set) {
172                 on_period = 70;
173                 off_period = 30;
174                 rt2x00dev->led_radio.led_dev.blink_set(
175                     &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
176         }
177
178         return;
179
180 exit_fail:
181         rt2x00leds_unregister(rt2x00dev);
182 }
183
184 static void rt2x00leds_unregister_led(struct rt2x00_led *led)
185 {
186         led_classdev_unregister(&led->led_dev);
187
188         /*
189          * This might look weird, but when we are unregistering while
190          * suspended the led is already off, and since we haven't
191          * fully resumed yet, access to the device might not be
192          * possible yet.
193          */
194         if (!(led->led_dev.flags & LED_SUSPENDED))
195                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
196
197         led->flags &= ~LED_REGISTERED;
198 }
199
200 void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
201 {
202         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
203                 rt2x00leds_unregister_led(&rt2x00dev->led_qual);
204         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
205                 rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
206         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
207                 rt2x00leds_unregister_led(&rt2x00dev->led_radio);
208 }
209
210 static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
211 {
212         led_classdev_suspend(&led->led_dev);
213
214         /* This shouldn't be needed, but just to be safe */
215         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
216         led->led_dev.brightness = LED_OFF;
217 }
218
219 void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
220 {
221         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
222                 rt2x00leds_suspend_led(&rt2x00dev->led_qual);
223         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
224                 rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
225         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
226                 rt2x00leds_suspend_led(&rt2x00dev->led_radio);
227 }
228
229 static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
230 {
231         led_classdev_resume(&led->led_dev);
232
233         /* Device might have enabled the LEDS during resume */
234         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
235         led->led_dev.brightness = LED_OFF;
236 }
237
238 void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
239 {
240         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
241                 rt2x00leds_resume_led(&rt2x00dev->led_radio);
242         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
243                 rt2x00leds_resume_led(&rt2x00dev->led_assoc);
244         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
245                 rt2x00leds_resume_led(&rt2x00dev->led_qual);
246 }