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 cpufreq_governor_powersave(struct cpufreq_policy * policy,unsigned int event)18static 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 cpufreq_gov_powersave_init(void)44static int __init cpufreq_gov_powersave_init(void) 45 { 46 return cpufreq_register_governor(&cpufreq_gov_powersave); 47 } 48 49 cpufreq_gov_powersave_exit(void)50static 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); 66