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 18 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg) 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 dprintk("setting to %u kHz because of event %u\n", policy->min, event); 27 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); 28 break; 29 default: 30 break; 31 } 32 return 0; 33 } 34 35 static struct cpufreq_governor cpufreq_gov_powersave = { 36 .name = "powersave", 37 .governor = cpufreq_governor_powersave, 38 .owner = THIS_MODULE, 39 }; 40 41 42 static int __init cpufreq_gov_powersave_init(void) 43 { 44 return cpufreq_register_governor(&cpufreq_gov_powersave); 45 } 46 47 48 static void __exit cpufreq_gov_powersave_exit(void) 49 { 50 cpufreq_unregister_governor(&cpufreq_gov_powersave); 51 } 52 53 54 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); 55 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); 56 MODULE_LICENSE("GPL"); 57 58 module_init(cpufreq_gov_powersave_init); 59 module_exit(cpufreq_gov_powersave_exit); 60