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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <ctype.h>
     18 #include <errno.h>
     19 #include <inttypes.h>
     20 #include <stdlib.h>
     21 #include <string.h>
     22 
     23 #define LOG_TAG "ThermalHAL"
     24 #include <utils/Log.h>
     25 
     26 #include <hardware/hardware.h>
     27 #include <hardware/thermal.h>
     28 
     29 #define MAX_LENGTH                    50
     30 
     31 #define CPU_USAGE_FILE                "/proc/stat"
     32 #define TEMPERATURE_FILE_FORMAT       "/sys/class/thermal/thermal_zone%d/temp"
     33 #define CPU_ONLINE_FILE_FORMAT        "/sys/devices/system/cpu/cpu%d/online"
     34 
     35 #define BATTERY_SENSOR_NUM            23
     36 #define GPU_SENSOR_NUM                13
     37 #define SKIN_SENSOR_NUM               18
     38 
     39 const int CPU_SENSORS[] = {8, 9, 10, 11, 14, 15, 16, 7};
     40 
     41 #define CPU_NUM                       (sizeof(CPU_SENSORS) / sizeof(int))
     42 #define TEMPERATURE_NUM               11
     43 
     44 //qcom, therm-reset-temp
     45 #define CPU_SHUTDOWN_THRESHOLD        115
     46 //qcom, limit-temp
     47 #define CPU_THROTTLING_THRESHOLD      60
     48 #define BATTERY_SHUTDOWN_THRESHOLD    60
     49 // device/huawei/angler/thermal-engine-angler.conf
     50 #define SKIN_THROTTLING_THRESHOLD     41
     51 #define SKIN_SHUTDOWN_THRESHOLD       64
     52 #define VR_THROTTLED_BELOW_MIN        47
     53 
     54 #define GPU_LABEL                     "GPU"
     55 #define BATTERY_LABEL                 "battery"
     56 #define SKIN_LABEL                    "skin"
     57 
     58 const char *CPU_LABEL[] = {"CPU0", "CPU1", "CPU2", "CPU3", "CPU4", "CPU5", "CPU6", "CPU7"};
     59 
     60 /**
     61  * Reads device temperature.
     62  *
     63  * @param sensor_num Number of sensor file with temperature.
     64  * @param type Device temperature type.
     65  * @param name Device temperature name.
     66  * @param mult Multiplier used to translate temperature to Celsius.
     67  * @param throttling_threshold Throttling threshold for the temperature.
     68  * @param shutdown_threshold Shutdown threshold for the temperature.
     69  * @param out Pointer to temperature_t structure that will be filled with current
     70  *     values.
     71  *
     72  * @return 0 on success or negative value -errno on error.
     73  */
     74 static ssize_t read_temperature(int sensor_num, int type, const char *name, float mult,
     75         float throttling_threshold, float shutdown_threshold, float vr_throttling_threshold,
     76         temperature_t *out) {
     77     FILE *file;
     78     char file_name[MAX_LENGTH];
     79     float temp;
     80 
     81     sprintf(file_name, TEMPERATURE_FILE_FORMAT, sensor_num);
     82     file = fopen(file_name, "r");
     83     if (file == NULL) {
     84         ALOGE("%s: failed to open: %s", __func__, strerror(errno));
     85         return -errno;
     86     }
     87     if (1 != fscanf(file, "%f", &temp)) {
     88         fclose(file);
     89         ALOGE("%s: failed to read a float: %s", __func__, strerror(errno));
     90         return errno ? -errno : -EIO;
     91     }
     92 
     93     fclose(file);
     94 
     95     (*out) = (temperature_t) {
     96         .type = type,
     97         .name = name,
     98         .current_value = temp * mult,
     99         .throttling_threshold = throttling_threshold,
    100         .shutdown_threshold = shutdown_threshold,
    101         .vr_throttling_threshold = vr_throttling_threshold
    102     };
    103 
    104     return 0;
    105 }
    106 
    107 static ssize_t get_cpu_temperatures(temperature_t *list, size_t size) {
    108     size_t cpu;
    109 
    110     for (cpu = 0; cpu < CPU_NUM; cpu++) {
    111         if (cpu >= size) {
    112             break;
    113         }
    114         // tsens_tz_sensor[7,8,9,10,11,14,15,6]: temperature in Celsius.
    115         ssize_t result = read_temperature(CPU_SENSORS[cpu], DEVICE_TEMPERATURE_CPU, CPU_LABEL[cpu],
    116                 1, CPU_THROTTLING_THRESHOLD, CPU_SHUTDOWN_THRESHOLD, UNKNOWN_TEMPERATURE,
    117                 &list[cpu]);
    118         if (result != 0) {
    119             return result;
    120         }
    121     }
    122     return cpu;
    123 }
    124 
    125 static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
    126     ssize_t result = 0;
    127     size_t current_index = 0;
    128 
    129     if (list == NULL) {
    130         return TEMPERATURE_NUM;
    131     }
    132 
    133     result = get_cpu_temperatures(list, size);
    134     if (result < 0) {
    135         return result;
    136     }
    137     current_index += result;
    138 
    139     // GPU temperature.
    140     if (current_index < size) {
    141         // tsens_tz_sensor12: temperature in Celsius.
    142         result = read_temperature(GPU_SENSOR_NUM, DEVICE_TEMPERATURE_GPU, GPU_LABEL, 1,
    143                 UNKNOWN_TEMPERATURE, UNKNOWN_TEMPERATURE, UNKNOWN_TEMPERATURE,
    144                 &list[current_index]);
    145         if (result < 0) {
    146             return result;
    147         }
    148         current_index++;
    149     }
    150 
    151     // Battery temperature.
    152     if (current_index < size) {
    153         // hwmon sensor: battery: temperature in millidegrees Celsius.
    154         result = read_temperature(BATTERY_SENSOR_NUM, DEVICE_TEMPERATURE_BATTERY, BATTERY_LABEL,
    155                 0.001, UNKNOWN_TEMPERATURE, BATTERY_SHUTDOWN_THRESHOLD, UNKNOWN_TEMPERATURE,
    156                 &list[current_index]);
    157         if (result < 0) {
    158             return result;
    159         }
    160         current_index++;
    161     }
    162 
    163     // Skin temperature.
    164     if (current_index < size) {
    165         // msm_thermal: temperature in Celsius.
    166         result = read_temperature(SKIN_SENSOR_NUM, DEVICE_TEMPERATURE_SKIN, SKIN_LABEL, 1,
    167                 SKIN_THROTTLING_THRESHOLD, SKIN_SHUTDOWN_THRESHOLD, VR_THROTTLED_BELOW_MIN,
    168                 &list[current_index]);
    169         if (result < 0) {
    170             return result;
    171         }
    172         current_index++;
    173     }
    174     return TEMPERATURE_NUM;
    175 }
    176 
    177 static ssize_t get_cpu_usages(thermal_module_t *module, cpu_usage_t *list) {
    178     int vals, cpu_num, online;
    179     ssize_t read;
    180     uint64_t user, nice, system, idle, active, total;
    181     char *line = NULL;
    182     size_t len = 0;
    183     size_t size = 0;
    184     char file_name[MAX_LENGTH];
    185     FILE *file;
    186     FILE *cpu_file;
    187 
    188     if (list == NULL) {
    189         return CPU_NUM;
    190     }
    191 
    192     file = fopen(CPU_USAGE_FILE, "r");
    193     if (file == NULL) {
    194         ALOGE("%s: failed to open: %s", __func__, strerror(errno));
    195         return -errno;
    196     }
    197 
    198     while ((read = getline(&line, &len, file)) != -1) {
    199         // Skip non "cpu[0-9]" lines.
    200         if (strnlen(line, read) < 4 || strncmp(line, "cpu", 3) != 0 || !isdigit(line[3])) {
    201             free(line);
    202             line = NULL;
    203             len = 0;
    204             continue;
    205         }
    206 
    207         vals = sscanf(line, "cpu%d %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64, &cpu_num, &user,
    208                 &nice, &system, &idle);
    209 
    210         free(line);
    211         line = NULL;
    212         len = 0;
    213 
    214         if (vals != 5 || size == CPU_NUM) {
    215             if (vals != 5) {
    216                 ALOGE("%s: failed to read CPU information from file: %s", __func__,
    217                         strerror(errno));
    218             } else {
    219                 ALOGE("/proc/stat file has incorrect format.");
    220             }
    221             fclose(file);
    222             return errno ? -errno : -EIO;
    223         }
    224 
    225         active = user + nice + system;
    226         total = active + idle;
    227 
    228         // Read online CPU information.
    229         snprintf(file_name, MAX_LENGTH, CPU_ONLINE_FILE_FORMAT, cpu_num);
    230         cpu_file = fopen(file_name, "r");
    231         online = 0;
    232         if (cpu_file == NULL) {
    233             ALOGE("%s: failed to open file: %s (%s)", __func__, file_name, strerror(errno));
    234             fclose(file);
    235             return -errno;
    236         }
    237         if (1 != fscanf(cpu_file, "%d", &online)) {
    238             ALOGE("%s: failed to read CPU online information from file: %s (%s)", __func__,
    239                     file_name, strerror(errno));
    240             fclose(file);
    241             fclose(cpu_file);
    242             return errno ? -errno : -EIO;
    243         }
    244         fclose(cpu_file);
    245 
    246         list[size] = (cpu_usage_t) {
    247             .name = CPU_LABEL[size],
    248             .active = active,
    249             .total = total,
    250             .is_online = online
    251         };
    252 
    253         size++;
    254     }
    255     fclose(file);
    256 
    257     if (size != CPU_NUM) {
    258         ALOGE("/proc/stat file has incorrect format.");
    259         return -EIO;
    260     }
    261     return CPU_NUM;
    262 }
    263 
    264 static struct hw_module_methods_t thermal_module_methods = {
    265     .open = NULL,
    266 };
    267 
    268 thermal_module_t HAL_MODULE_INFO_SYM = {
    269     .common = {
    270         .tag = HARDWARE_MODULE_TAG,
    271         .module_api_version = THERMAL_HARDWARE_MODULE_API_VERSION_0_1,
    272         .hal_api_version = HARDWARE_HAL_API_VERSION,
    273         .id = THERMAL_HARDWARE_MODULE_ID,
    274         .name = "Angler Thermal HAL",
    275         .author = "The Android Open Source Project",
    276         .methods = &thermal_module_methods,
    277     },
    278     .getTemperatures = get_temperatures,
    279     .getCpuUsages = get_cpu_usages,
    280 };
    281