63 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/devfreq/governor_performance.c4 *5 * Copyright (C) 2011 Samsung Electronics6 * 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 as18 * said in devfreq.h19 */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_DESCRIPTION("DEVFREQ Performance governor");62MODULE_LICENSE("GPL");63