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...) \
19 cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg)
20
21 static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
22 unsigned int event)
23 {
24 switch (event) {
25 case CPUFREQ_GOV_START:
26 case CPUFREQ_GOV_LIMITS:
27 dprintk("setting to %u kHz because of event %u\n",
28 policy->min, event);
29 __cpufreq_driver_target(policy, policy->min,
30 CPUFREQ_RELATION_L);
31 break;
32 default:
33 break;
34 }
35 return 0;
36 }
37
38 static struct cpufreq_governor cpufreq_gov_powersave = {
39 .name = "powersave",
40 .governor = cpufreq_governor_powersave,
41 .owner = THIS_MODULE,
42 };
43
44
45 static int __init cpufreq_gov_powersave_init(void)
46 {
47 return cpufreq_register_governor(&cpufreq_gov_powersave);
48 }
49
50
51 static void __exit cpufreq_gov_powersave_exit(void)
52 {
53 cpufreq_unregister_governor(&cpufreq_gov_powersave);
54 }
55
56
57 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
58 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
59 MODULE_LICENSE("GPL");
60
61 module_init(cpufreq_gov_powersave_init);
62 module_exit(cpufreq_gov_powersave_exit);
63
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