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 int cpufreq_governor_powersave(struct cpufreq_policy *policy, 20 unsigned int event) 21 { 22 switch (event) { 23 case CPUFREQ_GOV_START: 24 case CPUFREQ_GOV_LIMITS: 25 pr_debug("setting to %u kHz because of event %u\n", 26 policy->min, event); 27 __cpufreq_driver_target(policy, policy->min, 28 CPUFREQ_RELATION_L); 29 break; 30 default: 31 break; 32 } 33 return 0; 34 } 35 36 #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 37 static 38 #endif 39 struct cpufreq_governor cpufreq_gov_powersave = { 40 .name = "powersave", 41 .governor = cpufreq_governor_powersave, 42 .owner = THIS_MODULE, 43 }; 44 45 static int __init cpufreq_gov_powersave_init(void) 46 { 47 return cpufreq_register_governor(&cpufreq_gov_powersave); 48 } 49 50 static void __exit cpufreq_gov_powersave_exit(void) 51 { 52 cpufreq_unregister_governor(&cpufreq_gov_powersave); 53 } 54 55 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); 56 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); 57 MODULE_LICENSE("GPL"); 58 59 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 60 fs_initcall(cpufreq_gov_powersave_init); 61 #else 62 module_init(cpufreq_gov_powersave_init); 63 #endif 64 module_exit(cpufreq_gov_powersave_exit); 65