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 
cpufreq_gov_powersave_limits(struct cpufreq_policy * policy)19 static void cpufreq_gov_powersave_limits(struct cpufreq_policy *policy)
20 {
21 	pr_debug("setting to %u kHz\n", policy->min);
22 	__cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
23 }
24 
25 static struct cpufreq_governor cpufreq_gov_powersave = {
26 	.name		= "powersave",
27 	.limits		= cpufreq_gov_powersave_limits,
28 	.owner		= THIS_MODULE,
29 };
30 
cpufreq_gov_powersave_init(void)31 static int __init cpufreq_gov_powersave_init(void)
32 {
33 	return cpufreq_register_governor(&cpufreq_gov_powersave);
34 }
35 
cpufreq_gov_powersave_exit(void)36 static void __exit cpufreq_gov_powersave_exit(void)
37 {
38 	cpufreq_unregister_governor(&cpufreq_gov_powersave);
39 }
40 
41 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
42 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
43 MODULE_LICENSE("GPL");
44 
45 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
cpufreq_default_governor(void)46 struct cpufreq_governor *cpufreq_default_governor(void)
47 {
48 	return &cpufreq_gov_powersave;
49 }
50 
51 fs_initcall(cpufreq_gov_powersave_init);
52 #else
53 module_init(cpufreq_gov_powersave_init);
54 #endif
55 module_exit(cpufreq_gov_powersave_exit);
56