linux/drivers/cpufreq/cpufreq_powersave.c
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   1/*
   2 *  linux/drivers/cpufreq/cpufreq_powersave.c
   3 *
   4 *  Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
   5 *
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 */
  12
  13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/cpufreq.h>
  18#include <linux/init.h>
  19
  20static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
  21                                        unsigned int event)
  22{
  23        switch (event) {
  24        case CPUFREQ_GOV_START:
  25        case CPUFREQ_GOV_LIMITS:
  26                pr_debug("setting to %u kHz because of event %u\n",
  27                                                        policy->min, event);
  28                __cpufreq_driver_target(policy, policy->min,
  29                                                CPUFREQ_RELATION_L);
  30                break;
  31        default:
  32                break;
  33        }
  34        return 0;
  35}
  36
  37#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  38static
  39#endif
  40struct cpufreq_governor cpufreq_gov_powersave = {
  41        .name           = "powersave",
  42        .governor       = cpufreq_governor_powersave,
  43        .owner          = THIS_MODULE,
  44};
  45
  46static int __init cpufreq_gov_powersave_init(void)
  47{
  48        return cpufreq_register_governor(&cpufreq_gov_powersave);
  49}
  50
  51
  52static void __exit cpufreq_gov_powersave_exit(void)
  53{
  54        cpufreq_unregister_governor(&cpufreq_gov_powersave);
  55}
  56
  57
  58MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  59MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  60MODULE_LICENSE("GPL");
  61
  62#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  63fs_initcall(cpufreq_gov_powersave_init);
  64#else
  65module_init(cpufreq_gov_powersave_init);
  66#endif
  67module_exit(cpufreq_gov_powersave_exit);
  68
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