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 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg)
  19
  20 static 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                 dprintk("setting to %u kHz because of event %u\n", policy->min, event);
  27                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
  28                 break;
  29         default:
  30                 break;
  31         }
  32         return 0;
  33 }
  34
  35 static struct cpufreq_governor cpufreq_gov_powersave = {
  36         .name           = "powersave",
  37         .governor       = cpufreq_governor_powersave,
  38         .owner          = THIS_MODULE,
  39 };
  40
  41
  42 static int __init cpufreq_gov_powersave_init(void)
  43 {
  44         return cpufreq_register_governor(&cpufreq_gov_powersave);
  45 }
  46
  47
  48 static void __exit cpufreq_gov_powersave_exit(void)
  49 {
  50         cpufreq_unregister_governor(&cpufreq_gov_powersave);
  51 }
  52
  53
  54 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  55 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  56 MODULE_LICENSE("GPL");
  57
  58 module_init(cpufreq_gov_powersave_init);
  59 module_exit(cpufreq_gov_powersave_exit);