/*
* Copyright (C) 2016 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 <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#define LOG_TAG "ThermalHAL"
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/thermal.h>
#define MAX_LENGTH 50
#define CPU_USAGE_FILE "/proc/stat"
#define TEMPERATURE_FILE_FORMAT "/sys/class/thermal/thermal_zone%d/temp"
#define CPU_ONLINE_FILE_FORMAT "/sys/devices/system/cpu/cpu%d/online"
#define CPU_SENSOR_NUM 3
#define BATTERY_SENSOR_NUM 2
#define GPU_SENSOR_NUM 4
#define CPU_NUM 2
#define TEMPERATURE_NUM 4
#define BATTERY_SHUTDOWN_THRESHOLD 68
#define GPU_LABEL "GPU"
#define BATTERY_LABEL "battery"
const char *CPU_LABEL[] = {"CPU0", "CPU1"};
/**
* Reads device temperature.
*
* @param sensor_num Number of sensor file with temperature.
* @param type Device temperature type.
* @param name Device temperature name.
* @param mult Multiplier used to translate temperature to Celsius.
* @param throttling_threshold Throttling threshold for the temperature.
* @param shutdown_threshold Shutdown threshold for the temperature.
* @param out Pointer to temperature_t structure that will be filled with current
* values.
*
* @return 0 on success or negative value -errno on error.
*/
static ssize_t read_temperature(int sensor_num, int type, const char *name, float mult,
float throttling_threshold, float shutdown_threshold, temperature_t *out) {
FILE *file;
char file_name[MAX_LENGTH];
float temp;
sprintf(file_name, TEMPERATURE_FILE_FORMAT, sensor_num);
file = fopen(file_name, "r");
if (file == NULL) {
ALOGE("%s: failed to open: %s", __func__, strerror(errno));
return -errno;
}
if (1 != fscanf(file, "%f", &temp)) {
fclose(file);
ALOGE("%s: failed to read a float: %s", __func__, strerror(errno));
return errno ? -errno : -EIO;
}
fclose(file);
(*out) = (temperature_t) {
.type = type,
.name = name,
.current_value = temp * mult,
.throttling_threshold = throttling_threshold,
.shutdown_threshold = shutdown_threshold,
.vr_throttling_threshold = UNKNOWN_TEMPERATURE
};
return 0;
}
static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
ssize_t result = 0;
size_t current_index = 0;
if (list == NULL) {
return TEMPERATURE_NUM;
}
// CPU temperature.
if (current_index < size) {
// CPU_therm: temperature in millidegrees Celsius.
result = read_temperature(CPU_SENSOR_NUM, DEVICE_TEMPERATURE_CPU, CPU_LABEL[0], 0.001,
UNKNOWN_TEMPERATURE, UNKNOWN_TEMPERATURE, &list[current_index]);
if (result < 0) {
return result;
}
current_index++;
if (current_index < size) {
list[current_index] = list[current_index - 1];
list[current_index].name = CPU_LABEL[1];
current_index++;
}
}
// GPU temperature.
if (current_index < size) {
// GPU_therm: temperature in millidegrees Celsius.
result = read_temperature(GPU_SENSOR_NUM, DEVICE_TEMPERATURE_GPU, GPU_LABEL, 0.001,
UNKNOWN_TEMPERATURE, UNKNOWN_TEMPERATURE, &list[current_index]);
if (result < 0) {
return result;
}
current_index++;
}
// Battery temperature.
if (current_index < size) {
// battery: temperature in millidegrees Celsius.
result = read_temperature(BATTERY_SENSOR_NUM, DEVICE_TEMPERATURE_BATTERY, BATTERY_LABEL,
0.001, UNKNOWN_TEMPERATURE, BATTERY_SHUTDOWN_THRESHOLD, &list[current_index]);
if (result < 0) {
return result;
}
current_index++;
}
return TEMPERATURE_NUM;
}
static ssize_t get_cpu_usages(thermal_module_t *module, cpu_usage_t *list) {
int vals, cpu_num, online;
ssize_t read;
uint64_t user, nice, system, idle, active, total;
char *line = NULL;
size_t len = 0;
size_t size = 0;
char file_name[MAX_LENGTH];
FILE *file;
FILE *cpu_file;
if (list == NULL) {
return CPU_NUM;
}
file = fopen(CPU_USAGE_FILE, "r");
if (file == NULL) {
ALOGE("%s: failed to open: %s", __func__, strerror(errno));
return -errno;
}
while ((read = getline(&line, &len, file)) != -1) {
// Skip non "cpu[0-9]" lines.
if (strnlen(line, read) < 4 || strncmp(line, "cpu", 3) != 0 || !isdigit(line[3])) {
free(line);
line = NULL;
len = 0;
continue;
}
vals = sscanf(line, "cpu%d %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64, &cpu_num, &user,
&nice, &system, &idle);
free(line);
line = NULL;
len = 0;
if (vals != 5 || size == CPU_NUM) {
if (vals != 5) {
ALOGE("%s: failed to read CPU information from file: %s", __func__,
strerror(errno));
} else {
ALOGE("/proc/stat file has incorrect format.");
}
fclose(file);
return errno ? -errno : -EIO;
}
active = user + nice + system;
total = active + idle;
// Read online CPU information.
snprintf(file_name, MAX_LENGTH, CPU_ONLINE_FILE_FORMAT, cpu_num);
cpu_file = fopen(file_name, "r");
online = 0;
if (cpu_file == NULL) {
ALOGE("%s: failed to open file: %s (%s)", __func__, file_name, strerror(errno));
fclose(file);
return -errno;
}
if (1 != fscanf(cpu_file, "%d", &online)) {
ALOGE("%s: failed to read CPU online information from file: %s (%s)", __func__,
file_name, strerror(errno));
fclose(file);
fclose(cpu_file);
return errno ? -errno : -EIO;
}
fclose(cpu_file);
list[size] = (cpu_usage_t) {
.name = CPU_LABEL[size],
.active = active,
.total = total,
.is_online = online
};
size++;
}
fclose(file);
if (size != CPU_NUM) {
ALOGE("/proc/stat file has incorrect format.");
return -EIO;
}
return CPU_NUM;
}
static struct hw_module_methods_t thermal_module_methods = {
.open = NULL,
};
thermal_module_t HAL_MODULE_INFO_SYM = {
.common = {
.tag = HARDWARE_MODULE_TAG,
.module_api_version = THERMAL_HARDWARE_MODULE_API_VERSION_0_1,
.hal_api_version = HARDWARE_HAL_API_VERSION,
.id = THERMAL_HARDWARE_MODULE_ID,
.name = "Flounder Thermal HAL",
.author = "The Android Open Source Project",
.methods = &thermal_module_methods,
},
.getTemperatures = get_temperatures,
.getCpuUsages = get_cpu_usages,
};