1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/drivers/devfreq/governor_performance.c 4 * 5 * Copyright (C) 2011 Samsung Electronics 6 * MyungJoo Ham <myungjoo.ham@samsung.com> 7 */ 8 9#include <linux/devfreq.h> 10#include <linux/module.h> 11#include "governor.h" 12 13static int devfreq_performance_func(struct devfreq *df, 14 unsigned long *freq) 15{ 16 /* 17 * target callback should be able to get floor value as 18 * said in devfreq.h 19 */ 20 *freq = DEVFREQ_MAX_FREQ; 21 return 0; 22} 23 24static int devfreq_performance_handler(struct devfreq *devfreq, 25 unsigned int event, void *data) 26{ 27 int ret = 0; 28 29 if (event == DEVFREQ_GOV_START) { 30 mutex_lock(&devfreq->lock); 31 ret = update_devfreq(devfreq); 32 mutex_unlock(&devfreq->lock); 33 } 34 35 return ret; 36} 37 38static struct devfreq_governor devfreq_performance = { 39 .name = DEVFREQ_GOV_PERFORMANCE, 40 .get_target_freq = devfreq_performance_func, 41 .event_handler = devfreq_performance_handler, 42}; 43 44static int __init devfreq_performance_init(void) 45{ 46 return devfreq_add_governor(&devfreq_performance); 47} 48subsys_initcall(devfreq_performance_init); 49 50static void __exit devfreq_performance_exit(void) 51{ 52 int ret; 53 54 ret = devfreq_remove_governor(&devfreq_performance); 55 if (ret) 56 pr_err("%s: failed remove governor %d\n", __func__, ret); 57 58 return; 59} 60module_exit(devfreq_performance_exit); 61MODULE_LICENSE("GPL"); 62