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#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/cpufreq.h>
  16#include <linux/init.h>
  17
  18static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
  19                                        unsigned int event)
  20{
  21        switch (event) {
  22        case CPUFREQ_GOV_START:
  23        case CPUFREQ_GOV_LIMITS:
  24                pr_debug("setting to %u kHz because of event %u\n",
  25                                                        policy->min, event);
  26                __cpufreq_driver_target(policy, policy->min,
  27                                                CPUFREQ_RELATION_L);
  28                break;
  29        default:
  30                break;
  31        }
  32        return 0;
  33}
  34
  35#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  36static
  37#endif
  38struct cpufreq_governor cpufreq_gov_powersave = {
  39        .name           = "powersave",
  40        .governor       = cpufreq_governor_powersave,
  41        .owner          = THIS_MODULE,
  42};
  43
  44static int __init cpufreq_gov_powersave_init(void)
  45{
  46        return cpufreq_register_governor(&cpufreq_gov_powersave);
  47}
  48
  49
  50static void __exit cpufreq_gov_powersave_exit(void)
  51{
  52        cpufreq_unregister_governor(&cpufreq_gov_powersave);
  53}
  54
  55
  56MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  57MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  58MODULE_LICENSE("GPL");
  59
  60#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  61fs_initcall(cpufreq_gov_powersave_init);
  62#else
  63module_init(cpufreq_gov_powersave_init);
  64#endif
  65module_exit(cpufreq_gov_powersave_exit);
  66
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