Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / cpufreq / cpufreq_powersave.c
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);