1 /* 2 * linux/drivers/devfreq/governor_performance.c 3 * 4 * Copyright (C) 2011 Samsung Electronics 5 * MyungJoo Ham <myungjoo.ham@samsung.com> 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 #include <linux/devfreq.h> 13 #include <linux/module.h> 14 #include "governor.h" 15 16 static int devfreq_performance_func(struct devfreq *df, 17 unsigned long *freq) 18 { 19 /* 20 * target callback should be able to get floor value as 21 * said in devfreq.h 22 */ 23 if (!df->max_freq) 24 *freq = UINT_MAX; 25 else 26 *freq = df->max_freq; 27 return 0; 28 } 29 30 static int devfreq_performance_handler(struct devfreq *devfreq, 31 unsigned int event, void *data) 32 { 33 int ret = 0; 34 35 if (event == DEVFREQ_GOV_START) { 36 mutex_lock(&devfreq->lock); 37 ret = update_devfreq(devfreq); 38 mutex_unlock(&devfreq->lock); 39 } 40 41 return ret; 42 } 43 44 static struct devfreq_governor devfreq_performance = { 45 .name = "performance", 46 .get_target_freq = devfreq_performance_func, 47 .event_handler = devfreq_performance_handler, 48 }; 49 50 static int __init devfreq_performance_init(void) 51 { 52 return devfreq_add_governor(&devfreq_performance); 53 } 54 subsys_initcall(devfreq_performance_init); 55 56 static void __exit devfreq_performance_exit(void) 57 { 58 int ret; 59 60 ret = devfreq_remove_governor(&devfreq_performance); 61 if (ret) 62 pr_err("%s: failed remove governor %d\n", __func__, ret); 63 64 return; 65 } 66 module_exit(devfreq_performance_exit); 67 MODULE_LICENSE("GPL"); 68