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/kernel.h> 16 #include <linux/module.h> 17 #include <linux/cpufreq.h> 18 #include <linux/init.h> 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 pr_debug("setting to %u kHz because of event %u\n", 27 policy->min, event); 28 __cpufreq_driver_target(policy, policy->min, 29 CPUFREQ_RELATION_L); 30 break; 31 default: 32 break; 33 } 34 return 0; 35 } 36 37 #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 38 static 39 #endif 40 struct cpufreq_governor cpufreq_gov_powersave = { 41 .name = "powersave", 42 .governor = cpufreq_governor_powersave, 43 .owner = THIS_MODULE, 44 }; 45 46 static int __init cpufreq_gov_powersave_init(void) 47 { 48 return cpufreq_register_governor(&cpufreq_gov_powersave); 49 } 50 51 52 static void __exit cpufreq_gov_powersave_exit(void) 53 { 54 cpufreq_unregister_governor(&cpufreq_gov_powersave); 55 } 56 57 58 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); 59 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); 60 MODULE_LICENSE("GPL"); 61 62 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 63 fs_initcall(cpufreq_gov_powersave_init); 64 #else 65 module_init(cpufreq_gov_powersave_init); 66 #endif 67 module_exit(cpufreq_gov_powersave_exit); 68