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 CPU0_SENSOR_NUM             6
36 #define BATTERY_SENSOR_NUM          17
37 #define GPU_SENSOR_NUM              11
38 #define SKIN_SENSOR_NUM             14
39 
40 #define CPU_NUM                     4
41 #define TEMPERATURE_NUM             7
42 
43 // qcom, therm-reset-temp
44 #define CPU_SHUTDOWN_THRESHOLD      115
45 // qcom, limit-temp
46 #define CPU_THROTTLING_THRESHOLD    60
47 
48 #define BATTERY_SHUTDOWN_THRESHOLD  68
49 // vendor/moto/shamu/proprietary/thermal-engine/thermal-engine-shamu.conf
50 #define SKIN_THROTTLING_THRESHOLD   40
51 
52 #define GPU_LABEL                   "GPU"
53 #define BATTERY_LABEL               "battery"
54 #define SKIN_LABEL                  "skin"
55 
56 const char *CPU_LABEL[] = {"CPU0", "CPU1", "CPU2", "CPU3"};
57 
58 /**
59  * Reads device temperature.
60  *
61  * @param sensor_num Number of sensor file with temperature.
62  * @param type Device temperature type.
63  * @param name Device temperature name.
64  * @param mult Multiplier used to translate temperature to Celsius.
65  * @param throttling_threshold Throttling threshold for the temperature.
66  * @param shutdown_threshold Shutdown threshold for the temperature.
67  * @param out Pointer to temperature_t structure that will be filled with current values.
68  *
69  * @return 0 on success or negative value -errno on error.
70  */
read_temperature(int sensor_num,int type,const char * name,float mult,float throttling_threshold,float shutdown_threshold,temperature_t * out)71 static ssize_t read_temperature(int sensor_num, int type, const char *name, float mult,
72         float throttling_threshold, float shutdown_threshold, temperature_t *out) {
73     FILE *file;
74     char file_name[MAX_LENGTH];
75     float temp;
76 
77     sprintf(file_name, TEMPERATURE_FILE_FORMAT, sensor_num);
78     file = fopen(file_name, "r");
79     if (file == NULL) {
80         ALOGE("%s: failed to open: %s", __func__, strerror(errno));
81         return -errno;
82     }
83     if (1 != fscanf(file, "%f", &temp)) {
84         fclose(file);
85         ALOGE("%s: failed to read a float: %s", __func__, strerror(errno));
86         return errno ? -errno : -EIO;
87     }
88 
89     fclose(file);
90 
91     (*out) = (temperature_t) {
92         .type = type,
93         .name = name,
94         .current_value = temp * mult,
95         .throttling_threshold = throttling_threshold,
96         .shutdown_threshold = shutdown_threshold,
97         .vr_throttling_threshold = UNKNOWN_TEMPERATURE
98     };
99 
100     return 0;
101 }
102 
get_cpu_temperatures(temperature_t * list,size_t size)103 static ssize_t get_cpu_temperatures(temperature_t *list, size_t size) {
104     size_t cpu;
105 
106     for (cpu = 0; cpu < CPU_NUM; cpu++) {
107         if (cpu >= size) {
108             break;
109         }
110         // tsens_tz_sensor[5-8]: temperature in Celsius.
111         ssize_t result = read_temperature(cpu + CPU0_SENSOR_NUM, DEVICE_TEMPERATURE_CPU,
112                 CPU_LABEL[cpu], 1, CPU_THROTTLING_THRESHOLD, CPU_SHUTDOWN_THRESHOLD, &list[cpu]);
113         if (result != 0) {
114             return result;
115         }
116     }
117     return cpu;
118 }
119 
get_temperatures(thermal_module_t * module,temperature_t * list,size_t size)120 static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
121     ssize_t result = 0;
122     size_t current_index = 0;
123 
124     if (list == NULL) {
125         return TEMPERATURE_NUM;
126     }
127 
128     result = get_cpu_temperatures(list, size);
129     if (result < 0) {
130         return result;
131     }
132     current_index += result;
133 
134     // GPU temperature.
135     if (current_index < size) {
136         // tsens_tz_sensor11: temperature in Celsius.
137         result = read_temperature(GPU_SENSOR_NUM, DEVICE_TEMPERATURE_GPU, GPU_LABEL,
138                 1, UNKNOWN_TEMPERATURE, UNKNOWN_TEMPERATURE, &list[current_index]);
139         if (result < 0) {
140             return result;
141         }
142         current_index++;
143     }
144 
145     // Battery temperature.
146     if (current_index < size) {
147         // hwmon sensor: battery: temperature in millidegrees Celsius.
148         result = read_temperature(BATTERY_SENSOR_NUM, DEVICE_TEMPERATURE_BATTERY, BATTERY_LABEL,
149                 0.001, UNKNOWN_TEMPERATURE, BATTERY_SHUTDOWN_THRESHOLD, &list[current_index]);
150         if (result < 0) {
151             return result;
152         }
153         current_index++;
154     }
155 
156     // Skin temperature.
157     if (current_index < size) {
158         // quiet_therm: temperature in Celsius.
159         result = read_temperature(SKIN_SENSOR_NUM, DEVICE_TEMPERATURE_SKIN, SKIN_LABEL, 1,
160                 SKIN_THROTTLING_THRESHOLD, UNKNOWN_TEMPERATURE, &list[current_index]);
161         if (result < 0) {
162             return result;
163         }
164         current_index++;
165     }
166     return TEMPERATURE_NUM;
167 }
168 
get_cpu_usages(thermal_module_t * module,cpu_usage_t * list)169 static ssize_t get_cpu_usages(thermal_module_t *module, cpu_usage_t *list) {
170     int vals, cpu_num, online;
171     ssize_t read;
172     uint64_t user, nice, system, idle, active, total;
173     char *line = NULL;
174     size_t len = 0;
175     size_t size = 0;
176     char file_name[MAX_LENGTH];
177     FILE *file;
178     FILE *cpu_file;
179 
180     if (list == NULL) {
181         return CPU_NUM;
182     }
183 
184     file = fopen(CPU_USAGE_FILE, "r");
185     if (file == NULL) {
186         ALOGE("%s: failed to open: %s", __func__, strerror(errno));
187         return -errno;
188     }
189 
190     while ((read = getline(&line, &len, file)) != -1) {
191         // Skip non "cpu[0-9]" lines.
192         if (strnlen(line, read) < 4 || strncmp(line, "cpu", 3) != 0 || !isdigit(line[3])) {
193             free(line);
194             line = NULL;
195             len = 0;
196             continue;
197         }
198 
199         vals = sscanf(line, "cpu%d %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64, &cpu_num, &user,
200                 &nice, &system, &idle);
201 
202         free(line);
203         line = NULL;
204         len = 0;
205 
206         if (vals != 5 || size == CPU_NUM) {
207             if (vals != 5) {
208                 ALOGE("%s: failed to read CPU information from file: %s", __func__,
209                         strerror(errno));
210             } else {
211                 ALOGE("/proc/stat file has incorrect format.");
212             }
213             fclose(file);
214             return errno ? -errno : -EIO;
215         }
216 
217         active = user + nice + system;
218         total = active + idle;
219 
220         // Read online CPU information.
221         snprintf(file_name, MAX_LENGTH, CPU_ONLINE_FILE_FORMAT, cpu_num);
222         cpu_file = fopen(file_name, "r");
223         online = 0;
224         if (cpu_file == NULL) {
225             ALOGE("%s: failed to open file: %s (%s)", __func__, file_name, strerror(errno));
226             fclose(file);
227             return -errno;
228         }
229         if (1 != fscanf(cpu_file, "%d", &online)) {
230             ALOGE("%s: failed to read CPU online information from file: %s (%s)", __func__,
231                     file_name, strerror(errno));
232             fclose(file);
233             fclose(cpu_file);
234             return errno ? -errno : -EIO;
235         }
236         fclose(cpu_file);
237 
238         list[size] = (cpu_usage_t) {
239             .name = CPU_LABEL[size],
240             .active = active,
241             .total = total,
242             .is_online = online
243         };
244 
245         size++;
246     }
247 
248     fclose(file);
249 
250     if (size != CPU_NUM) {
251         ALOGE("/proc/stat file has incorrect format.");
252         return -EIO;
253     }
254 
255     return size;
256 }
257 
258 static struct hw_module_methods_t thermal_module_methods = {
259     .open = NULL,
260 };
261 
262 thermal_module_t HAL_MODULE_INFO_SYM = {
263     .common = {
264         .tag = HARDWARE_MODULE_TAG,
265         .module_api_version = THERMAL_HARDWARE_MODULE_API_VERSION_0_1,
266         .hal_api_version = HARDWARE_HAL_API_VERSION,
267         .id = THERMAL_HARDWARE_MODULE_ID,
268         .name = "Shamu Thermal HAL",
269         .author = "The Android Open Source Project",
270         .methods = &thermal_module_methods,
271     },
272     .getTemperatures = get_temperatures,
273     .getCpuUsages = get_cpu_usages,
274 };
275