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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 "Tuna PowerHAL"
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/power.h>
#define SCALINGMAXFREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
#define SCREENOFFMAXFREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/screen_off_max_freq"
#define BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
#define MAX_BUF_SZ 10
/* initialize to something safe */
static char screen_off_max_freq[MAX_BUF_SZ] = "700000";
static char scaling_max_freq[MAX_BUF_SZ] = "1200000";
/* for tracking previous screen state */
static int previous_state = 0;
struct tuna_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);
}
int sysfs_read(const char *path, char *buf, size_t size)
{
int fd, len;
fd = open(path, O_RDONLY);
if (fd < 0)
return -1;
do {
len = read(fd, buf, size);
} while (len < 0 && errno == EINTR);
close(fd);
return len;
}
static void tuna_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 tuna_power_module *tuna)
{
char buf[80];
pthread_mutex_lock(&tuna->lock);
if (tuna->boostpulse_fd < 0) {
tuna->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY);
if (tuna->boostpulse_fd < 0) {
if (!tuna->boostpulse_warned) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, buf);
tuna->boostpulse_warned = 1;
}
}
}
pthread_mutex_unlock(&tuna->lock);
return tuna->boostpulse_fd;
}
static void tuna_power_set_interactive(struct power_module *module, int on)
{
/*
* Lower maximum frequency when screen changes from on to off.
* Return it to previous value when screen changes from off to on.
* CPU 0 and 1 share a cpufreq policy.
*/
//screen state has changed since last call
if (on != previous_state)
{
char buf_screen_off_max[MAX_BUF_SZ], buf_scaling_max[MAX_BUF_SZ];
int screen_off_max, scaling_max;
previous_state = on;
//read value of screen-off max from sysfs, and convert to int for comparison
if (sysfs_read(SCREENOFFMAXFREQ_PATH, buf_screen_off_max, sizeof(buf_screen_off_max)) != -1)
screen_off_max = atoi(buf_screen_off_max);
//read value of max from sysfs, and convert to int for comparison
if (sysfs_read(SCALINGMAXFREQ_PATH, buf_scaling_max, sizeof(buf_scaling_max)) != -1)
scaling_max = atoi(buf_scaling_max);
/* If scaling_max_freq > screen_off_max_freq, then scaling_max_freq is really the maximum frequency, so save it for the next time the screen comes on.
* If screen_off_max_freq == 0, then we're just going to write our saved scalin_max_freq back to sysfs no matter what
* If scaling_max_freq == screen_off_max_freq, then scaling_max_freq has the screen_off_max in it, so DON'T SAVE IT TO OUR MAX VARIABLE!
*/
if (scaling_max > screen_off_max)
memcpy(scaling_max_freq,
(scaling_max > screen_off_max) ? buf_scaling_max : buf_screen_off_max,
strlen((scaling_max > screen_off_max) ? buf_scaling_max : buf_screen_off_max));
memcpy(screen_off_max_freq,
(scaling_max <= screen_off_max && screen_off_max > 0) ? buf_scaling_max : buf_screen_off_max,
strlen((scaling_max <= screen_off_max && screen_off_max > 0) ? buf_scaling_max : buf_screen_off_max));
//write the appropriate value for scaling_max back to sysfs
sysfs_write(SCALINGMAXFREQ_PATH, on?scaling_max_freq:screen_off_max_freq);
}
}
static void tuna_power_hint(struct power_module *module, power_hint_t hint,
void *data)
{
struct tuna_power_module *tuna = (struct tuna_power_module *) module;
char buf[80];
int len;
int duration = 1;
switch (hint) {
case POWER_HINT_INTERACTION:
case POWER_HINT_CPU_BOOST:
if (data != NULL)
duration = (int) data;
if (boostpulse_open(tuna) >= 0) {
snprintf(buf, sizeof(buf), "%d", duration);
len = write(tuna->boostpulse_fd, buf, strlen(buf));
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 tuna_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: "Tuna Power HAL",
author: "The Android Open Source Project",
methods: &power_module_methods,
},
init: tuna_power_init,
setInteractive: tuna_power_set_interactive,
powerHint: tuna_power_hint,
},
lock: PTHREAD_MUTEX_INITIALIZER,
boostpulse_fd: -1,
boostpulse_warned: 0,
};
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