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/*
* Copyright (c) 2017, The Linux Foundation. All rights reserved.
* Not a contribution
* 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 CPU_ONLINE_FILE_FORMAT "/sys/devices/system/cpu/cpu%d/online"
#define CPU_PRESENT_FILE "/sys/devices/system/cpu/present"
const char * __attribute__ ((weak)) get_cpu_label(unsigned int cpu_num) {
ALOGD("Entering %s",__func__);
static const char * cpu_label = "cpu";
return cpu_label;
}
size_t __attribute__ ((weak)) get_num_cpus() {
ALOGD("Entering %s",__func__);
FILE *file;
char *line = NULL;
size_t len = 0;
static size_t cpus = 0;
ssize_t read;
if(cpus) return cpus;
file = fopen(CPU_PRESENT_FILE, "r");
if (file == NULL) {
ALOGE("%s: failed to open: %s", __func__, strerror(errno));
return 0;
}
if ((read = getline(&line, &len, file)) != -1) {
if (strnlen(line, read) < 3 || strncmp(line, "0-", 2) != 0 || !isdigit(line[2]))
ALOGE("%s: Incorrect cpu present file format", __func__);
else
cpus = atoi(&line[2]) + 1;
free(line);
}
else
ALOGE("%s: failed to read cpu present file: %s", __func__, strerror(errno));
fclose(file);
return cpus;
}
ssize_t __attribute__ ((weak)) get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
ALOGD("Entering %s",__func__);
return 0;
}
static ssize_t get_cpu_usages(thermal_module_t *module, cpu_usage_t *list) {
ALOGD("Entering %s",__func__);
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;
size_t cpus = 0;
char file_name[MAX_LENGTH];
FILE *file;
FILE *cpu_file;
cpus = get_num_cpus();
if (!cpus)
return errno ? -errno : -EIO;
if (list == NULL)
return cpus;
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) {
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 == cpus) {
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 = get_cpu_label(size),
.active = active,
.total = total,
.is_online = online
};
size++;
}
fclose(file);
if (size != cpus) {
ALOGE("/proc/stat file has incorrect format.");
return -EIO;
}
return cpus;
}
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 = "Thermal HAL",
.author = "The Android Open Source Project",
.methods = &thermal_module_methods,
},
.getTemperatures = get_temperatures,
.getCpuUsages = get_cpu_usages,
};
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