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/*
* Copyright 2015, Intel Corporation
*
* This file is part of PowerTOP
*
* This program file 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; version 2 of the License.
*
* 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.
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
* Daniel Leung <daniel.leung@linux.intel.com>
*/
#include "tuning.h"
#include "tunable.h"
#include "unistd.h"
#include "tuningi2c.h"
#include <string.h>
#include <dirent.h>
#include <utility>
#include <iostream>
#include <fstream>
#include <ctype.h>
#include <limits.h>
#include "../lib.h"
#include "../devices/runtime_pm.h"
i2c_tunable::i2c_tunable(const char *path, const char *name, bool is_adapter) : tunable("", 0.9, _("Good"), _("Bad"), _("Unknown"))
{
ifstream file;
char filename[PATH_MAX];
string devname;
snprintf(filename, sizeof(filename), "%s/name", path);
file.open(filename, ios::in);
if (file) {
getline(file, devname);
file.close();
}
if (is_adapter) {
snprintf(i2c_path, sizeof(i2c_path), "%s/device/power/control", path);
snprintf(filename, sizeof(filename), "%s/device", path);
} else {
snprintf(i2c_path, sizeof(i2c_path), "%s/power/control", path);
snprintf(filename, sizeof(filename), "%s/device", path);
}
if (device_has_runtime_pm(filename))
snprintf(desc, sizeof(desc), _("Runtime PM for I2C %s %s (%s)"), (is_adapter ? _("Adapter") : _("Device")), name, (devname.empty() ? "" : devname.c_str()));
else
snprintf(desc, sizeof(desc), _("I2C %s %s has no runtime power management"), (is_adapter ? _("Adapter") : _("Device")), name);
snprintf(toggle_good, sizeof(toggle_good), "echo 'auto' > '%s';", i2c_path);
snprintf(toggle_bad, sizeof(toggle_bad), "echo 'on' > '%s';", i2c_path);
}
int i2c_tunable::good_bad(void)
{
string content;
content = read_sysfs_string(i2c_path);
if (strcmp(content.c_str(), "auto") == 0)
return TUNE_GOOD;
return TUNE_BAD;
}
void i2c_tunable::toggle(void)
{
int good;
good = good_bad();
if (good == TUNE_GOOD) {
write_sysfs(i2c_path, "on");
return;
}
write_sysfs(i2c_path, "auto");
}
const char *i2c_tunable::toggle_script(void)
{
int good;
good = good_bad();
if (good == TUNE_GOOD) {
return toggle_bad;
}
return toggle_good;
}
static void add_i2c_callback(const char *d_name)
{
class i2c_tunable *i2c;
char filename[PATH_MAX];
bool is_adapter = false;
snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s/new_device", d_name);
if (access(filename, W_OK) == 0)
is_adapter = true;
snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s", d_name);
i2c = new class i2c_tunable(filename, d_name, is_adapter);
if (is_adapter)
snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s/device", d_name);
else
snprintf(filename, PATH_MAX, "/sys/bus/i2c/devices/%s", d_name);
if (device_has_runtime_pm(filename))
all_tunables.push_back(i2c);
else
all_untunables.push_back(i2c);
}
void add_i2c_tunables(void)
{
process_directory("/sys/bus/i2c/devices/", add_i2c_callback);
}
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