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 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/cpufreq.h>
  16 #include <linux/init.h>
  17
  18 static 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
  36 static
  37 #endif
  38 struct cpufreq_governor cpufreq_gov_powersave = {
  39         .name           = "powersave",
  40         .governor       = cpufreq_governor_powersave,
  41         .owner          = THIS_MODULE,
  42 };
  43
  44 static int __init cpufreq_gov_powersave_init(void)
  45 {
  46         return cpufreq_register_governor(&cpufreq_gov_powersave);
  47 }
  48
  49
  50 static void __exit cpufreq_gov_powersave_exit(void)
  51 {
  52         cpufreq_unregister_governor(&cpufreq_gov_powersave);
  53 }
  54
  55
  56 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  57 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  58 MODULE_LICENSE("GPL");
  59
  60 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  61 fs_initcall(cpufreq_gov_powersave_init);
  62 #else
  63 module_init(cpufreq_gov_powersave_init);
  64 #endif
  65 module_exit(cpufreq_gov_powersave_exit);