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/*
* debugfs file to track time spent in suspend
*
* Copyright (c) 2011, Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/seq_file.h>
#include <linux/syscore_ops.h>
#include <linux/time.h>
static struct timespec suspend_time_before;
static unsigned int time_in_suspend_bins[32];
#ifdef CONFIG_DEBUG_FS
static int suspend_time_debug_show(struct seq_file *s, void *data)
{
int bin;
seq_printf(s, "time (secs) count\n");
seq_printf(s, "------------------\n");
for (bin = 0; bin < 32; bin++) {
if (time_in_suspend_bins[bin] == 0)
continue;
seq_printf(s, "%4d - %4d %4u\n",
bin ? 1 << (bin - 1) : 0, 1 << bin,
time_in_suspend_bins[bin]);
}
return 0;
}
static int suspend_time_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, suspend_time_debug_show, NULL);
}
static const struct file_operations suspend_time_debug_fops = {
.open = suspend_time_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init suspend_time_debug_init(void)
{
struct dentry *d;
d = debugfs_create_file("suspend_time", 0755, NULL, NULL,
&suspend_time_debug_fops);
if (!d) {
pr_err("Failed to create suspend_time debug file\n");
return -ENOMEM;
}
return 0;
}
late_initcall(suspend_time_debug_init);
#endif
static int suspend_time_syscore_suspend(void)
{
read_persistent_clock(&suspend_time_before);
return 0;
}
static void suspend_time_syscore_resume(void)
{
struct timespec after;
read_persistent_clock(&after);
after = timespec_sub(after, suspend_time_before);
time_in_suspend_bins[fls(after.tv_sec)]++;
pr_info("Suspended for %lu.%03lu seconds\n", after.tv_sec,
after.tv_nsec / NSEC_PER_MSEC);
}
static struct syscore_ops suspend_time_syscore_ops = {
.suspend = suspend_time_syscore_suspend,
.resume = suspend_time_syscore_resume,
};
static int suspend_time_syscore_init(void)
{
register_syscore_ops(&suspend_time_syscore_ops);
return 0;
}
static void suspend_time_syscore_exit(void)
{
unregister_syscore_ops(&suspend_time_syscore_ops);
}
module_init(suspend_time_syscore_init);
module_exit(suspend_time_syscore_exit);
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