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  */
read_temperature(int sensor_num,int type,const char * name,float mult,float throttling_threshold,float shutdown_threshold,float vr_throttling_threshold,temperature_t * out)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 
get_cpu_temperatures(temperature_t * list,size_t size)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 
get_temperatures(thermal_module_t * module,temperature_t * list,size_t size)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 
get_cpu_usages(thermal_module_t * module,cpu_usage_t * list)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