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
19static 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
37static
38#endif
39struct cpufreq_governor cpufreq_gov_powersave = {
40	.name		= "powersave",
41	.governor	= cpufreq_governor_powersave,
42	.owner		= THIS_MODULE,
43};
44
45static int __init cpufreq_gov_powersave_init(void)
46{
47	return cpufreq_register_governor(&cpufreq_gov_powersave);
48}
49
50static void __exit cpufreq_gov_powersave_exit(void)
51{
52	cpufreq_unregister_governor(&cpufreq_gov_powersave);
53}
54
55MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
56MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
57MODULE_LICENSE("GPL");
58
59#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
60fs_initcall(cpufreq_gov_powersave_init);
61#else
62module_init(cpufreq_gov_powersave_init);
63#endif
64module_exit(cpufreq_gov_powersave_exit);
65