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CPUFreq scaling governor interface for Linux/Android hosted devices.

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For a usage example see http://gerrit.rockbox.org/r/#/c/1074/

Change-Id: I1d61e0eba6552a9b5d6e15a2e3169435b2f7079d
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Udo Schläpfer 2015-01-21 20:35:03 +01:00 • committed by Gerrit Rockbox
parent 6d3dc8fce0
commit a312ca1c50
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firmware/target/hosted/cpufreq-linux.h Normal file
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/***************************************************************************
* __________ __ ___
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2015 by Udo Schläpfer
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
*
* Interface for the Linux CPUFreq kernel modul.
* See https://www.kernel.org/doc/Documentation/cpu-freq/
*
****************************************************************************/
#ifndef __CPUFREQ_LINUX_H__
#define __CPUFREQ_LINUX_H__
#include <stdbool.h>
/*
Get the available governors for cpu.
governors Preallocated string for the available governors. On succes this will look like
"performance ondemand powersave", each word beeing a governor that can be used with
cpufreq_set_governor.
governors_size Size of governors.
cpu The cpu, starting with 0, for which to get the available governors. CPUFREQ_ALL_CPUS is not
supported, you must supply a cpu. See cpucount_linux in cpuinfo-linux.h.
*/
void cpufreq_available_governors(char* governors, int governors_size, int cpu);
/*
Set the cpufreq governor for cpu.
governor The governor to set. This must be one of the available governors returned by
cpufreq_available_governors.
cpu The cpu, starting with 0, for which to set the governor. CPUFREQ_ALL_CPUS to set
the governor for all cpus. See cpucount_linux in cpuinfo-linux.h.
*/
void cpufreq_set_governor(const char* governor, int cpu);
static const int CPUFREQ_ALL_CPUS = -1;
#endif