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