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 static struct cpufreq_governor cpufreq_gov_powersave = { 37 .name = "powersave", 38 .governor = cpufreq_governor_powersave, 39 .owner = THIS_MODULE, 40 }; 41 42 static int __init cpufreq_gov_powersave_init(void) 43 { 44 return cpufreq_register_governor(&cpufreq_gov_powersave); 45 } 46 47 static void __exit cpufreq_gov_powersave_exit(void) 48 { 49 cpufreq_unregister_governor(&cpufreq_gov_powersave); 50 } 51 52 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); 53 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); 54 MODULE_LICENSE("GPL"); 55 56 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 57 struct cpufreq_governor *cpufreq_default_governor(void) 58 { 59 return &cpufreq_gov_powersave; 60 } 61 62 fs_initcall(cpufreq_gov_powersave_init); 63 #else 64 module_init(cpufreq_gov_powersave_init); 65 #endif 66 module_exit(cpufreq_gov_powersave_exit); 67