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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 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE |
39 | static |
40 | #endif |
41 | struct cpufreq_governor cpufreq_gov_powersave = { |
42 | .name = "powersave", |
43 | .governor = cpufreq_governor_powersave, |
44 | .owner = THIS_MODULE, |
45 | }; |
46 | |
47 | static int __init cpufreq_gov_powersave_init(void) |
48 | { |
49 | return cpufreq_register_governor(&cpufreq_gov_powersave); |
50 | } |
51 | |
52 | |
53 | static void __exit cpufreq_gov_powersave_exit(void) |
54 | { |
55 | cpufreq_unregister_governor(&cpufreq_gov_powersave); |
56 | } |
57 | |
58 | |
59 | MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); |
60 | MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); |
61 | MODULE_LICENSE("GPL"); |
62 | |
63 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE |
64 | fs_initcall(cpufreq_gov_powersave_init); |
65 | #else |
66 | module_init(cpufreq_gov_powersave_init); |
67 | #endif |
68 | module_exit(cpufreq_gov_powersave_exit); |
69 |
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