cpufreq_powersave.c

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/*
 *  linux/drivers/cpufreq/cpufreq_powersave.c
 *
 *  Copyright (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpufreq.h>
#include <linux/init.h>

static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
                    unsigned int event)
{
    switch (event) {
    case CPUFREQ_GOV_START:
    case CPUFREQ_GOV_LIMITS:
        pr_debug("setting to %u kHz because of event %u\n",
                            policy->min, event);
        __cpufreq_driver_target(policy, policy->min,
                        CPUFREQ_RELATION_L);
        break;
    default:
        break;
    }
    return 0;
}

#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
static
#endif
struct cpufreq_governor cpufreq_gov_powersave = {
    .name       = "powersave",
    .governor   = cpufreq_governor_powersave,
    .owner      = THIS_MODULE,
};

static int __init cpufreq_gov_powersave_init(void)
{
    return cpufreq_register_governor(&cpufreq_gov_powersave);
}


static void __exit cpufreq_gov_powersave_exit(void)
{
    cpufreq_unregister_governor(&cpufreq_gov_powersave);
}


MODULE_AUTHOR("Dominik Brodowski <[email protected]>");
MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
MODULE_LICENSE("GPL");

#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
fs_initcall(cpufreq_gov_powersave_init);
#else
module_init(cpufreq_gov_powersave_init);
#endif
module_exit(cpufreq_gov_powersave_exit);