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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define LOG_TAG "Piranha PowerHAL"
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/power.h>
#define BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
struct piranha_power_module {
struct power_module base;
pthread_mutex_t lock;
int boostpulse_fd;
int boostpulse_warned;
};
static void sysfs_write(char *path, char *s)
{
char buf[80];
int len;
int fd = open(path, O_WRONLY);
if (fd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", path, buf);
return;
}
len = write(fd, s, strlen(s));
if (len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", path, buf);
}
close(fd);
}
static void piranha_power_init(struct power_module *module)
{
/*
* cpufreq interactive governor: timer 20ms, min sample 60ms,
* hispeed 700MHz at load 50%.
*/
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
"20000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time",
"60000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq",
"700000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load",
"50");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay",
"100000");
}
static int boostpulse_open(struct piranha_power_module *piranha)
{
char buf[80];
pthread_mutex_lock(&piranha->lock);
if (piranha->boostpulse_fd < 0) {
piranha->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY);
if (piranha->boostpulse_fd < 0) {
if (!piranha->boostpulse_warned) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, buf);
piranha->boostpulse_warned = 1;
}
}
}
pthread_mutex_unlock(&piranha->lock);
return piranha->boostpulse_fd;
}
static void piranha_power_set_interactive(struct power_module *module, int on)
{
/*
* Lower maximum frequency when screen is off. CPU 0 and 1 share a
* cpufreq policy.
*/
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq",
on ? "1008000" : "600000");
}
static void piranha_power_hint(struct power_module *module, power_hint_t hint,
void *data)
{
struct piranha_power_module *piranha = (struct piranha_power_module *) module;
char buf[80];
int len;
switch (hint) {
case POWER_HINT_INTERACTION:
if (boostpulse_open(piranha) >= 0) {
len = write(piranha->boostpulse_fd, "1", 1);
if (len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", BOOSTPULSE_PATH, buf);
}
}
break;
case POWER_HINT_VSYNC:
break;
default:
break;
}
}
static struct hw_module_methods_t power_module_methods = {
.open = NULL,
};
struct piranha_power_module HAL_MODULE_INFO_SYM = {
base: {
common: {
tag: HARDWARE_MODULE_TAG,
module_api_version: POWER_MODULE_API_VERSION_0_2,
hal_api_version: HARDWARE_HAL_API_VERSION,
id: POWER_HARDWARE_MODULE_ID,
name: "Piranha Power HAL",
author: "The Android Open Source Project",
methods: &power_module_methods,
},
init: piranha_power_init,
setInteractive: piranha_power_set_interactive,
powerHint: piranha_power_hint,
},
lock: PTHREAD_MUTEX_INITIALIZER,
boostpulse_fd: -1,
boostpulse_warned: 0,
};
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