188 lines
3.8 KiB
C
Executable file
188 lines
3.8 KiB
C
Executable file
/*
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* linux/drivers/devfreq/governor_temptrigger.c
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*
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* Copyright(c) 2013-2015 Allwinnertech Co., Ltd.
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*
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* Author: Pan Nan <pannan@allwinnertech.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sunxi_dramfreq.h>
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#include "governor.h"
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long temp_data;
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unsigned int temp_max = 105;
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unsigned int temp_min = 95;
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static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%ld\n", temp_data);
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}
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static ssize_t show_max(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", temp_max);
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}
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static ssize_t store_max(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int value;
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int ret;
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ret = sscanf(buf, "%u", &value);
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if (ret != 1)
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return -EINVAL;
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if (value <= temp_min)
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return -EINVAL;
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temp_max = value;
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return count;
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}
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static ssize_t show_min(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", temp_min);
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}
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static ssize_t store_min(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int value;
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int ret;
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ret = sscanf(buf, "%u", &value);
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if (ret != 1)
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return -EINVAL;
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if (value >= temp_max)
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return -EINVAL;
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temp_min = value;
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return count;
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}
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static DEVICE_ATTR(temp, 0444, show_temp, NULL);
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static DEVICE_ATTR(max, 0644, show_max, store_max);
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static DEVICE_ATTR(min, 0644, show_min, store_min);
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static struct attribute *dev_entries[] = {
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&dev_attr_temp.attr,
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&dev_attr_max.attr,
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&dev_attr_min.attr,
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NULL,
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};
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static struct attribute_group dev_attr_group = {
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.name = "temptrigger",
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.attrs = dev_entries,
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};
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static int devfreq_temptrigger_func(struct devfreq *df, unsigned long *freq)
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{
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struct devfreq_dev_status stat;
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int err = df->profile->get_dev_status(df->dev.parent, &stat);
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if (err)
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return err;
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temp_data = *(long *)stat.private_data;
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if (temp_data > temp_max) {
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pr_debug("temp:%ld > %u\n", temp_data, temp_max);
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*freq = df->max_freq >> 1;
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} else if (temp_data < temp_min) {
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pr_debug("temp:%ld < %u\n", temp_data, temp_min);
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*freq = df->max_freq;
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} else {
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*freq = df->previous_freq;
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}
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return 0;
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}
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static int temptrigger_init(struct devfreq *devfreq)
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{
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int ret = 0;
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if (!devfreq)
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return -EINVAL;
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ret = sysfs_create_group(&devfreq->dev.kobj, &dev_attr_group);
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if (ret)
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return ret;
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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return -EINVAL;
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}
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dramfreq->governor_state_update(devfreq->governor_name, STATE_INIT);
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return 0;
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}
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static void temptrigger_exit(struct devfreq *devfreq)
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{
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if (!devfreq)
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return;
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sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group);
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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return;
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}
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dramfreq->governor_state_update(devfreq->governor_name, STATE_EXIT);
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}
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static int devfreq_temptrigger_handler(struct devfreq *devfreq,
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unsigned int event, void *data)
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{
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int ret = 0;
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switch (event) {
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case DEVFREQ_GOV_START:
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ret = temptrigger_init(devfreq);
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break;
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case DEVFREQ_GOV_STOP:
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temptrigger_exit(devfreq);
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break;
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default:
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break;
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}
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return ret;
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}
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static struct devfreq_governor devfreq_temptrigger = {
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.name = "temptrigger",
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.get_target_freq = devfreq_temptrigger_func,
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.event_handler = devfreq_temptrigger_handler,
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};
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static int __init devfreq_temptrigger_init(void)
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{
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return devfreq_add_governor(&devfreq_temptrigger);
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}
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late_initcall(devfreq_temptrigger_init);
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static void __exit devfreq_temptrigger_exit(void)
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{
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if (devfreq_remove_governor(&devfreq_temptrigger))
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pr_err("%s: failed remove governor\n", __func__);
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return;
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}
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module_exit(devfreq_temptrigger_exit);
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MODULE_LICENSE("GPL");
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