2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_LIGHTS_INTERFACE_H
18 #define ANDROID_LIGHTS_INTERFACE_H
21 #include <sys/cdefs.h>
22 #include <sys/types.h>
24 #include <hardware/hardware.h>
29 * The id of this module
31 #define LIGHTS_HARDWARE_MODULE_ID "lights"
34 * These light IDs correspond to logical lights, not physical.
35 * So for example, if your INDICATOR light is in line with your
36 * BUTTONS, it might make sense to also light the INDICATOR
37 * light to a reasonable color when the BUTTONS are lit.
39 #define LIGHT_ID_BACKLIGHT "backlight"
40 #define LIGHT_ID_KEYBOARD "keyboard"
41 #define LIGHT_ID_BUTTONS "buttons"
42 #define LIGHT_ID_BATTERY "battery"
43 #define LIGHT_ID_NOTIFICATIONS "notifications"
44 #define LIGHT_ID_ATTENTION "attention"
47 * These lights aren't currently supported by the higher
48 * layers, but could be someday, so we have the constants
51 #define LIGHT_ID_BLUETOOTH "bluetooth"
52 #define LIGHT_ID_WIFI "wifi"
54 /* ************************************************************************
55 * Flash modes for the flashMode field of light_state_t.
58 #define LIGHT_FLASH_NONE 0
61 * To flash the light at a given rate, set flashMode to LIGHT_FLASH_TIMED,
62 * and then flashOnMS should be set to the number of milliseconds to turn
63 * the light on, followed by the number of milliseconds to turn the light
66 #define LIGHT_FLASH_TIMED 1
69 * To flash the light using hardware assist, set flashMode to
72 #define LIGHT_FLASH_HARDWARE 2
75 * Light brightness is managed by a user setting.
77 #define BRIGHTNESS_MODE_USER 0
80 * Light brightness is managed by a light sensor.
82 #define BRIGHTNESS_MODE_SENSOR 1
85 * The parameters that can be set for a given light.
87 * Not all lights must support all parameters. If you
88 * can do something backward-compatible, you should.
90 struct light_state_t {
92 * The color of the LED in ARGB.
95 * - If your light can only do red or green, if they ask for blue,
96 * you should do green.
97 * - If you can only do a brightness ramp, then use this formula:
98 * unsigned char brightness = ((77*((color>>16)&0x00ff))
99 * + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
100 * - If you can only do on or off, 0 is off, anything else is on.
102 * The high byte should be ignored. Callers will set it to 0xff (which
103 * would correspond to 255 alpha).
108 * See the LIGHT_FLASH_* constants
115 * Policy used by the framework to manage the light's brightness.
116 * Currently the values are BRIGHTNESS_MODE_USER and BRIGHTNESS_MODE_SENSOR.
121 struct light_device_t {
122 struct hw_device_t common;
125 * Set the provided lights to the provided values.
127 * Returns: 0 on succes, error code on failure.
129 int (*set_light)(struct light_device_t* dev,
130 struct light_state_t const* state);
136 #endif // ANDROID_LIGHTS_INTERFACE_H