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drivers/cpufreq/cpufreq_powersave.c 1.5 KB
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  /*
   *  linux/drivers/cpufreq/cpufreq_powersave.c
   *
   *  Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
   *
   *
   * 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>
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  static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
  					unsigned int event)
  {
  	switch (event) {
  	case CPUFREQ_GOV_START:
  	case CPUFREQ_GOV_LIMITS:
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  		pr_debug("setting to %u kHz because of event %u
  ",
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  							policy->min, event);
  		__cpufreq_driver_target(policy, policy->min,
  						CPUFREQ_RELATION_L);
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  		break;
  	default:
  		break;
  	}
  	return 0;
  }
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  #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  static
  #endif
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  struct cpufreq_governor cpufreq_gov_powersave = {
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  	.name		= "powersave",
  	.governor	= cpufreq_governor_powersave,
  	.owner		= THIS_MODULE,
  };
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  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 <linux@brodo.de>");
  MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  MODULE_LICENSE("GPL");
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  #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  fs_initcall(cpufreq_gov_powersave_init);
  #else
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  module_init(cpufreq_gov_powersave_init);
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  #endif
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  module_exit(cpufreq_gov_powersave_exit);