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/*
* 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 <errno.h>
#include <ctype.h>
#include <dirent.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 CPU_LABEL "CPU"
#define MAX_LENGTH 50
#define CPU_USAGE_FILE "/proc/stat"
#define TEMPERATURE_DIR "/sys/class/thermal"
#define THERMAL_DIR "thermal_zone"
#define CPU_ONLINE_FILE_FORMAT "/sys/devices/system/cpu/cpu%d/online"
#define UNKNOWN_LABEL "UNKNOWN"
static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
char file_name[MAX_LENGTH];
FILE *file;
float temp;
size_t idx = 0;
DIR *dir;
struct dirent *de;
/** Read all available temperatures from
* /sys/class/thermal/thermal_zone[0-9]+/temp files.
* Don't guarantee that all temperatures are in Celsius. */
dir = opendir(TEMPERATURE_DIR);
if (dir == 0) {
ALOGE("%s: failed to open directory %s: %s", __func__, TEMPERATURE_DIR, strerror(-errno));
return -errno;
}
while ((de = readdir(dir))) {
if (!strncmp(de->d_name, THERMAL_DIR, strlen(THERMAL_DIR))) {
snprintf(file_name, MAX_LENGTH, "%s/%s/temp", TEMPERATURE_DIR, de->d_name);
file = fopen(file_name, "r");
if (file == NULL) {
continue;
}
if (1 != fscanf(file, "%f", &temp)) {
fclose(file);
continue;
}
if (list != NULL && idx < size) {
list[idx] = (temperature_t) {
.name = UNKNOWN_LABEL,
.type = DEVICE_TEMPERATURE_UNKNOWN,
.current_value = temp,
.throttling_threshold = UNKNOWN_TEMPERATURE,
.shutdown_threshold = UNKNOWN_TEMPERATURE,
.vr_throttling_threshold = UNKNOWN_TEMPERATURE,
};
}
fclose(file);
idx++;
}
}
closedir(dir);
return idx;
}
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 *cpu_file;
FILE *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) {
ALOGE("%s: failed to read CPU information from file: %s", __func__, strerror(errno));
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));
// /sys/devices/system/cpu/cpu0/online is missing on some systems, because cpu0 can't
// be offline.
online = cpu_num == 0;
} else 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;
} else {
fclose(cpu_file);
}
if (list != NULL) {
list[size] = (cpu_usage_t) {
.name = CPU_LABEL,
.active = active,
.total = total,
.is_online = online
};
}
size++;
}
fclose(file);
return size;
}
static ssize_t get_cooling_devices(thermal_module_t *module, cooling_device_t *list, size_t size) {
return 0;
}
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 = "Default Thermal HAL",
.author = "The Android Open Source Project",
.methods = &thermal_module_methods,
},
.getTemperatures = get_temperatures,
.getCpuUsages = get_cpu_usages,
.getCoolingDevices = get_cooling_devices,
};
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