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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_INCLUDE_HARDWARE_POWER_H
#define ANDROID_INCLUDE_HARDWARE_POWER_H
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <hardware/hardware.h>
__BEGIN_DECLS
#define POWER_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1)
#define POWER_MODULE_API_VERSION_0_2 HARDWARE_MODULE_API_VERSION(0, 2)
/**
* The id of this module
*/
#define POWER_HARDWARE_MODULE_ID "power"
/*
* Power hint identifiers passed to (*powerHint)
*/
typedef enum {
POWER_HINT_VSYNC = 0x00000001,
POWER_HINT_INTERACTION = 0x00000002,
POWER_HINT_VIDEO_ENCODE = 0x00000003,
POWER_HINT_CPU_BOOST = 0x00000004,
} power_hint_t;
/**
* Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
* and the fields of this data structure must begin with hw_module_t
* followed by module specific information.
*/
typedef struct power_module {
struct hw_module_t common;
/*
* (*init)() performs power management setup actions at runtime
* startup, such as to set default cpufreq parameters. This is
* called only by the Power HAL instance loaded by
* PowerManagerService.
*/
void (*init)(struct power_module *module);
/*
* (*setInteractive)() performs power management actions upon the
* system entering interactive state (that is, the system is awake
* and ready for interaction, often with UI devices such as
* display and touchscreen enabled) or non-interactive state (the
* system appears asleep, display usually turned off). The
* non-interactive state is usually entered after a period of
* inactivity, in order to conserve battery power during
* such inactive periods.
*
* Typical actions are to turn on or off devices and adjust
* cpufreq parameters. This function may also call the
* appropriate interfaces to allow the kernel to suspend the
* system to low-power sleep state when entering non-interactive
* state, and to disallow low-power suspend when the system is in
* interactive state. When low-power suspend state is allowed, the
* kernel may suspend the system whenever no wakelocks are held.
*
* on is non-zero when the system is transitioning to an
* interactive / awake state, and zero when transitioning to a
* non-interactive / asleep state.
*
* This function is called to enter non-interactive state after
* turning off the screen (if present), and called to enter
* interactive state prior to turning on the screen.
*/
void (*setInteractive)(struct power_module *module, int on);
/*
* (*powerHint) is called to pass hints on power requirements, which
* may result in adjustment of power/performance parameters of the
* cpufreq governor and other controls. The possible hints are:
*
* POWER_HINT_VSYNC
*
* Foreground app has started or stopped requesting a VSYNC pulse
* from SurfaceFlinger. If the app has started requesting VSYNC
* then CPU and GPU load is expected soon, and it may be appropriate
* to raise speeds of CPU, memory bus, etc. The data parameter is
* non-zero to indicate VSYNC pulse is now requested, or zero for
* VSYNC pulse no longer requested.
*
* POWER_HINT_INTERACTION
*
* User is interacting with the device, for example, touchscreen
* events are incoming. CPU and GPU load may be expected soon,
* and it may be appropriate to raise speeds of CPU, memory bus,
* etc. The data parameter is unused.
*
* POWER_HINT_VIDEO_ENCODE
*
* The user just started or stopped recording video. When encode
* begins, large writes to the SD card will be done and this may
* cause CPU frequency to increase. The data parameter is a string
* with semicolon-separated 'key:value' pairs. The most common key is
* 'state', which takes 0 or 1 as its value. For instance, To
* indicate that recording is beginning, the string "state:1" would
* need to be used. More keys can be provided depending on the data
* that is to be passed.
*
* POWER_HINT_CPU_BOOST
*
* An operation is happening where it would be ideal for the CPU to
* be boosted for a specific duration. The data parameter is an
* integer value of the boost duration in microseconds.
*
* A particular platform may choose to ignore any hint.
*
* availability: version 0.2
*
*/
void (*powerHint)(struct power_module *module, power_hint_t hint,
void *data);
} power_module_t;
__END_DECLS
#endif // ANDROID_INCLUDE_HARDWARE_POWER_H
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