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/* drivers/misc/deep_idle.c
*
* Copyright 2011 Ezekeel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/deep_idle.h>
#define DEEPIDLE_VERSION 2
#define NUM_IDLESTATES 3
static DEFINE_MUTEX(lock);
static bool deepidle_enabled = false;
static unsigned long long num_idlecalls[NUM_IDLESTATES], time_in_idlestate[NUM_IDLESTATES];
static ssize_t deepidle_status_read(struct device * dev, struct device_attribute * attr, char * buf)
{
return sprintf(buf, "%u\n", (deepidle_enabled ? 1 : 0));
}
static ssize_t deepidle_status_write(struct device * dev, struct device_attribute * attr, const char * buf, size_t size)
{
unsigned int data;
if(sscanf(buf, "%u\n", &data) == 1)
{
if (data == 1)
{
pr_info("%s: DEEPIDLE enabled\n", __FUNCTION__);
deepidle_enabled = true;
}
else if (data == 0)
{
pr_info("%s: DEEPIDLE disabled\n", __FUNCTION__);
deepidle_enabled = false;
}
else
{
pr_info("%s: invalid input range %u\n", __FUNCTION__, data);
}
}
else
{
pr_info("%s: invalid input\n", __FUNCTION__);
}
return size;
}
static ssize_t show_idle_stats(struct device * dev, struct device_attribute * attr, char * buf)
{
int i;
unsigned long long msecs_in_idlestate[NUM_IDLESTATES], avg_in_idlestate[NUM_IDLESTATES];
mutex_lock(&lock);
for (i = 0; i < NUM_IDLESTATES; i++) {
msecs_in_idlestate[i] = time_in_idlestate[i] + 500;
do_div(msecs_in_idlestate[i], 1000);
if (num_idlecalls[i] == 0) {
avg_in_idlestate[i] = 0;
} else {
avg_in_idlestate[i] = msecs_in_idlestate[i];
do_div(avg_in_idlestate[i], num_idlecalls[i]);
}
}
mutex_unlock(&lock);
return sprintf(buf, "idle state total (average)\n===================================================\nIDLE %llums (%llums)\nDEEP IDLE (TOP=ON) %llums (%llums)\nDEEP IDLE (TOP=OFF) %llums (%llums)\n",
msecs_in_idlestate[0], avg_in_idlestate[0], msecs_in_idlestate[1], avg_in_idlestate[1], msecs_in_idlestate[2], avg_in_idlestate[2]);
}
static ssize_t show_idle_stats_list(struct device * dev, struct device_attribute * attr, char * buf)
{
int i;
unsigned long long msecs_in_idlestate[NUM_IDLESTATES], avg_in_idlestate[NUM_IDLESTATES];
mutex_lock(&lock);
for (i = 0; i < NUM_IDLESTATES; i++) {
msecs_in_idlestate[i] = time_in_idlestate[i] + 500;
do_div(msecs_in_idlestate[i], 1000);
if (num_idlecalls[i] == 0) {
avg_in_idlestate[i] = 0;
} else {
avg_in_idlestate[i] = msecs_in_idlestate[i];
do_div(avg_in_idlestate[i], num_idlecalls[i]);
}
}
mutex_unlock(&lock);
return sprintf(buf, "%llu %llu %llu %llu %llu %llu\n",
msecs_in_idlestate[0], avg_in_idlestate[0], msecs_in_idlestate[1],
avg_in_idlestate[1], msecs_in_idlestate[2], avg_in_idlestate[2]);
}
static void reset_stats(void)
{
int i;
for (i = 0; i < NUM_IDLESTATES; i++)
{
num_idlecalls[i] = 0;
time_in_idlestate[i] = 0;
}
return;
}
static ssize_t reset_idle_stats(struct device * dev, struct device_attribute * attr, const char * buf, size_t size)
{
unsigned int data;
if(sscanf(buf, "%u\n", &data) == 1)
{
if (data == 1)
{
mutex_lock(&lock);
reset_stats();
mutex_unlock(&lock);
}
else
{
pr_info("%s: invalid input range %u\n", __FUNCTION__, data);
}
}
else
{
pr_info("%s: invalid input\n", __FUNCTION__);
}
return size;
}
static ssize_t deepidle_version(struct device * dev, struct device_attribute * attr, char * buf)
{
return sprintf(buf, "%u\n", DEEPIDLE_VERSION);
}
static DEVICE_ATTR(enabled, S_IRUGO | S_IWUGO, deepidle_status_read, deepidle_status_write);
static DEVICE_ATTR(idle_stats, S_IRUGO , show_idle_stats, NULL);
static DEVICE_ATTR(idle_stats_list, S_IRUGO , show_idle_stats_list, NULL);
static DEVICE_ATTR(reset_stats, S_IWUGO , NULL, reset_idle_stats);
static DEVICE_ATTR(version, S_IRUGO , deepidle_version, NULL);
static struct attribute *deepidle_attributes[] =
{
&dev_attr_enabled.attr,
&dev_attr_idle_stats.attr,
&dev_attr_idle_stats_list.attr,
&dev_attr_reset_stats.attr,
&dev_attr_version.attr,
NULL
};
static struct attribute_group deepidle_group =
{
.attrs = deepidle_attributes,
};
static struct miscdevice deepidle_device =
{
.minor = MISC_DYNAMIC_MINOR,
.name = "deepidle",
};
bool deepidle_is_enabled(void)
{
return deepidle_enabled;
}
EXPORT_SYMBOL(deepidle_is_enabled);
void report_idle_time(int idle_state, int idle_time)
{
mutex_lock(&lock);
num_idlecalls[idle_state]++;
time_in_idlestate[idle_state] += (unsigned long long)idle_time;
if (num_idlecalls[idle_state] == 0 || time_in_idlestate[idle_state] < (unsigned long long)idle_time)
{
reset_stats();
}
mutex_unlock(&lock);
return;
}
EXPORT_SYMBOL(report_idle_time);
static int __init deepidle_init(void)
{
int ret;
pr_info("%s misc_register(%s)\n", __FUNCTION__, deepidle_device.name);
ret = misc_register(&deepidle_device);
if (ret)
{
pr_err("%s misc_register(%s) fail\n", __FUNCTION__, deepidle_device.name);
return 1;
}
if (sysfs_create_group(&deepidle_device.this_device->kobj, &deepidle_group) < 0)
{
pr_err("%s sysfs_create_group fail\n", __FUNCTION__);
pr_err("Failed to create sysfs group for device (%s)!\n", deepidle_device.name);
}
mutex_lock(&lock);
reset_stats();
mutex_unlock(&lock);
return 0;
}
device_initcall(deepidle_init);
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