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
39const 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
58const 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 */
74static 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
107static 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
125static 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
177static 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
264static struct hw_module_methods_t thermal_module_methods = {
265    .open = NULL,
266};
267
268thermal_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