drivers/cpufreq/cpufreq_powersave.c

   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/cpufreq.h>
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18
  19 static void cpufreq_gov_powersave_limits(struct cpufreq_policy *policy)
  20 {
  21         pr_debug("setting to %u kHz\n", policy->min);
  22         __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
  23 }
  24
  25 static struct cpufreq_governor cpufreq_gov_powersave = {
  26         .name           = "powersave",
  27         .limits         = cpufreq_gov_powersave_limits,
  28         .owner          = THIS_MODULE,
  29 };
  30
  31 static int __init cpufreq_gov_powersave_init(void)
  32 {
  33         return cpufreq_register_governor(&cpufreq_gov_powersave);
  34 }
  35
  36 static void __exit cpufreq_gov_powersave_exit(void)
  37 {
  38         cpufreq_unregister_governor(&cpufreq_gov_powersave);
  39 }
  40
  41 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  42 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  43 MODULE_LICENSE("GPL");
  44
  45 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  46 struct cpufreq_governor *cpufreq_default_governor(void)
  47 {
  48         return &cpufreq_gov_powersave;
  49 }
  50
  51 fs_initcall(cpufreq_gov_powersave_init);
  52 #else
  53 module_init(cpufreq_gov_powersave_init);
  54 #endif
  55 module_exit(cpufreq_gov_powersave_exit);