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1/*
2 * Copyright (C) 2011 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 * @author Tellen Yu
16 * @version 1.0
17 * @date 2017/7/19
18 * @par function description:
19 * - 1 thermal HAL
20 */
21
22#include <errno.h>
23#include <ctype.h>
24#include <dirent.h>
25#include <inttypes.h>
26#include <stdlib.h>
27#include <string.h>
28#include <vector>
29
30#define LOG_TAG "ThermalHAL"
31#include <utils/Log.h>
32
33#include <hardware/hardware.h>
34#include <hardware/thermal.h>
35
36#define TEMPERATURE_TYPE_CPU "CPU"
37#define TEMPERATURE_TYPE_GPU "GPU"
38
39#define CPU_LABEL_0 "CPU0"
40#define CPU_LABEL_1 "CPU1"
41#define CPU_LABEL_2 "CPU2"
42#define CPU_LABEL_3 "CPU3"
43#define MAX_LENGTH 100
44#define VALUE_LENGTH 64
45
46#define CPU_USAGE_FILE "/proc/stat"
47#define TEMPERATURE_DIR "/sys/class/thermal"
48#define THERMAL_DIR "thermal_zone"
49#define CPU_ONLINE_FILE_FORMAT "/sys/devices/system/cpu/cpu%d/online"
50#define UNKNOWN_LABEL "UNKNOWN"
51
52namespace android {
53namespace amlogic {
54
55/*---------------------------------------------------------------
56* FUNCTION NAME: readSysValue
57* DESCRIPTION:
58* read value from sysfs
59* ARGUMENTS:
60* const char *path:sysfs patch
61* Return:
62* -1:fail, >=0: success
63* Note:
64*
65*---------------------------------------------------------------*/
66static int readSysValue(const char *path) {
67 int fd, len;
68 char* end;
69 char value[VALUE_LENGTH] = {0};
70
71 if ((fd = open(path, O_RDONLY)) < 0) {
72 ALOGE("readSysValue, open %s fail.", path);
73 return -1;
74 }
75
76 len = read(fd, value, VALUE_LENGTH);
77 if (len < 0) {
78 ALOGE("read error: %s, %s\n", path, strerror(errno));
79 }
80
81 close(fd);
82
83 if ((0x0A == value[len-1]) || (0x0D == value[len-1])) {
84 value[len-1] = '\0';
85 }
86
87 //ALOGI("readSysValue, path: %s, value: %s\n", path, value);
88 int val = (int) strtol(value, &end, 0);
89 if (end == value || *end != '\0' || val == INT_MAX || val == INT_MIN) {
90 //ALOGI("readSysValue, end: %p, value: %p\n", end, value);
91 return -1;
92 }
93
94 return val;
95}
96
97static ssize_t getTemperatures(thermal_module_t *module, temperature_t *list, size_t size) {
98 char path[MAX_LENGTH];
99 float temp;
100 float throttlingThreshold;
101 float shutdownThreshold;
102 size_t idx = 0;
103 DIR *dir;
104 struct dirent *de;
105
106 /** Read all available temperatures from
107 * /sys/class/thermal/thermal_zone[0-9]+/temp files.
108 * Don't guarantee that all temperatures are in Celsius. */
109 dir = opendir(TEMPERATURE_DIR);
110 if (dir == 0) {
111 ALOGE("%s: failed to open directory %s: %s", __func__, TEMPERATURE_DIR, strerror(-errno));
112 return -errno;
113 }
114
115 while ((de = readdir(dir))) {
116 if (!strncmp(de->d_name, THERMAL_DIR, strlen(THERMAL_DIR))) {
117 int val;
118
119 snprintf(path, MAX_LENGTH, "%s/%s/temp", TEMPERATURE_DIR, de->d_name);
120 val = readSysValue(path);
121 if (val < 0) {
122 continue;
123 }
124
125 temp = (float)val/1000;
126 if (list != NULL && idx < size) {
127 snprintf(path, MAX_LENGTH, "%s/%s/trip_point_1_temp", TEMPERATURE_DIR, de->d_name);
128 val = readSysValue(path);
129 if (val >= 0) {
130 throttlingThreshold = (float)val/1000;
131 }
132
133 snprintf(path, MAX_LENGTH, "%s/%s/trip_point_3_temp", TEMPERATURE_DIR, de->d_name);
134 val = readSysValue(path);
135 if (val >= 0) {
136 shutdownThreshold = (float)val/1000;
137 }
138
139 list[idx] = (temperature_t) {
140 .name = TEMPERATURE_TYPE_CPU,
141 .type = DEVICE_TEMPERATURE_CPU,
142 .current_value = temp,
143 .throttling_threshold = throttlingThreshold,
144 .shutdown_threshold = shutdownThreshold,
145 .vr_throttling_threshold = UNKNOWN_TEMPERATURE,
146 };
147 }
148
149 idx++;
150 }
151 }
152 closedir(dir);
153
154 ALOGI("current temperature:%f, throttling_threshold:%f, shutdown_threshold:%f", temp, throttlingThreshold, shutdownThreshold);
155 return idx;
156}
157
158static ssize_t getCpuUsages(thermal_module_t *module, cpu_usage_t *list) {
159 int vals, cpu_num, online;
160 ssize_t read;
161 uint64_t user, nice, system, idle, active, total;
162 char *line = NULL;
163 size_t len = 0;
164 size_t size = 0;
165 char file_name[MAX_LENGTH];
166 FILE *cpu_file;
167 FILE *file = fopen(CPU_USAGE_FILE, "r");
168
169 if (file == NULL) {
170 ALOGE("%s: failed to open: %s", __func__, strerror(errno));
171 return -errno;
172 }
173
174 /* sample:
175 cpu 6604 1513 6140 156891 1251 0 9 0 0 0
176 cpu0 1399 423 1667 38709 346 0 5 0 0 0
177 cpu1 1521 325 1211 39586 157 0 3 0 0 0
178 cpu2 1980 399 1931 38470 381 0 0 0 0 0
179 cpu3 1704 366 1331 40126 367 0 1 0 0 0
180 */
181 while ((read = getline(&line, &len, file)) != -1) {
182 // Skip non "cpu[0-9]" lines.
183 if (strnlen(line, read) < 4 || strncmp(line, "cpu", 3) != 0 || !isdigit(line[3])) {
184 free(line);
185 line = NULL;
186 len = 0;
187 continue;
188 }
189 vals = sscanf(line, "cpu%d %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64, &cpu_num, &user,
190 &nice, &system, &idle);
191
192 free(line);
193 line = NULL;
194 len = 0;
195
196 if (vals != 5) {
197 ALOGE("%s: failed to read CPU information from file: %s", __func__, strerror(errno));
198 fclose(file);
199 return errno ? -errno : -EIO;
200 }
201
202 active = user + nice + system;
203 total = active + idle;
204
205 // Read online CPU information.
206 snprintf(file_name, MAX_LENGTH, CPU_ONLINE_FILE_FORMAT, cpu_num);
207 cpu_file = fopen(file_name, "r");
208 online = 0;
209 if (cpu_file == NULL) {
210 ALOGE("%s: failed to open file: %s (%s)", __func__, file_name, strerror(errno));
211 // /sys/devices/system/cpu/cpu0/online is missing on some systems, because cpu0 can't
212 // be offline.
213 online = cpu_num == 0;
214 } else if (1 != fscanf(cpu_file, "%d", &online)) {
215 ALOGE("%s: failed to read CPU online information from file: %s (%s)", __func__,
216 file_name, strerror(errno));
217 fclose(file);
218 fclose(cpu_file);
219 return errno ? -errno : -EIO;
220 } else {
221 fclose(cpu_file);
222 }
223
224 if (list != NULL) {
225 const char *cpuName = CPU_LABEL_0;
226 if (0 == cpu_num)
227 cpuName = CPU_LABEL_0;
228 else if (1 == cpu_num)
229 cpuName = CPU_LABEL_1;
230 else if (2 == cpu_num)
231 cpuName = CPU_LABEL_2;
232 else if (3 == cpu_num)
233 cpuName = CPU_LABEL_3;
234 list[size] = (cpu_usage_t) {
235 .name = cpuName,
236 .active = active,
237 .total = total,
238 .is_online = (1 == online)?true:false
239 };
240 }
241
242 size++;
243 }
244
245 //if (list != NULL) {
246 // for (size_t i = 0; i < size; ++i)
247 // ALOGI("index:%d: cpu name:%s", i, list[i].name);
248 //}
249
250 fclose(file);
251 return size;
252}
253
254static ssize_t getCoolingDevices(thermal_module_t *module, cooling_device_t *list, size_t size) {
255 return 0;
256}
257
258} // namespace amlogic
259} // namespace android
260
261
262static struct hw_module_methods_t thermal_module_methods = {
263 .open = NULL,
264};
265
266thermal_module_t HAL_MODULE_INFO_SYM = {
267 .common = {
268 .tag = HARDWARE_MODULE_TAG,
269 .module_api_version = THERMAL_HARDWARE_MODULE_API_VERSION_0_1,
270 .hal_api_version = HARDWARE_HAL_API_VERSION,
271 .id = THERMAL_HARDWARE_MODULE_ID,
272 .name = "AML Thermal HAL",
273 .author = "aml",
274 .methods = &thermal_module_methods,
275 },
276
277 .getTemperatures = android::amlogic::getTemperatures,
278 .getCpuUsages = android::amlogic::getCpuUsages,
279 .getCoolingDevices = android::amlogic::getCoolingDevices,
280};
281
generated by cgit at 2024-05-04 03:37:08 (GMT)