Re-worked hardware_properties to thermal HAL.
Bug: 27424857
Change-Id: Id7212421e499cc33c82e885756d68e89c2317acf
diff --git a/modules/thermal/Android.mk b/modules/thermal/Android.mk
new file mode 100644
index 0000000..80ad78a
--- /dev/null
+++ b/modules/thermal/Android.mk
@@ -0,0 +1,26 @@
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := thermal.default
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := thermal.c
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_MODULE_TAGS := optional
+LOCAL_CFLAGS := -Wno-unused-parameter
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/modules/thermal/thermal.c b/modules/thermal/thermal.c
new file mode 100644
index 0000000..c45d87a
--- /dev/null
+++ b/modules/thermal/thermal.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LOG_TAG "ThermalHAL"
+#include <utils/Log.h>
+
+#include <hardware/hardware.h>
+#include <hardware/thermal.h>
+
+#define CPU_LABEL "CPU"
+#define MAX_LENGTH 50
+
+#define CPU_USAGE_FILE "/proc/stat"
+#define TEMPERATURE_DIR "/sys/class/thermal"
+#define THERMAL_DIR "thermal_zone"
+#define CPU_ONLINE_FILE_FORMAT "/sys/devices/system/cpu/cpu%d/online"
+#define UNKNOWN_LABEL "UNKNOWN"
+
+static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
+ char file_name[MAX_LENGTH];
+ FILE *file;
+ float temp;
+ size_t idx = 0;
+ DIR *dir;
+ struct dirent *de;
+
+ /** Read all available temperatures from
+ * /sys/class/thermal/thermal_zone[0-9]+/temp files.
+ * Don't guarantee that all temperatures are in Celsius. */
+ dir = opendir(TEMPERATURE_DIR);
+ if (dir == 0) {
+ ALOGE("%s: failed to open directory %s: %s", __func__, TEMPERATURE_DIR, strerror(-errno));
+ return -errno;
+ }
+
+ while ((de = readdir(dir))) {
+ if (!strncmp(de->d_name, THERMAL_DIR, strlen(THERMAL_DIR))) {
+ snprintf(file_name, MAX_LENGTH, "%s/%s/temp", TEMPERATURE_DIR, de->d_name);
+ file = fopen(file_name, "r");
+ if (file == NULL) {
+ continue;
+ }
+ if (1 != fscanf(file, "%f", &temp)) {
+ fclose(file);
+ continue;
+ }
+
+ if (list != NULL && idx < size) {
+ list[idx] = (temperature_t) {
+ .name = UNKNOWN_LABEL,
+ .type = DEVICE_TEMPERATURE_UNKNOWN,
+ .current_value = temp,
+ .throttling_threshold = UNKNOWN_TEMPERATURE,
+ .shutdown_threshold = UNKNOWN_TEMPERATURE,
+ };
+ }
+ fclose(file);
+ idx++;
+ }
+ }
+ closedir(dir);
+ return idx;
+}
+
+static ssize_t get_cpu_usages(thermal_module_t *module, cpu_usage_t *list) {
+ int vals, cpu_num, online;
+ ssize_t read;
+ uint64_t user, nice, system, idle, active, total;
+ char *line = NULL;
+ size_t len = 0;
+ size_t size = 0;
+ char file_name[MAX_LENGTH];
+ FILE *cpu_file;
+ FILE *file = fopen(CPU_USAGE_FILE, "r");
+
+ if (file == NULL) {
+ ALOGE("%s: failed to open: %s", __func__, strerror(errno));
+ return -errno;
+ }
+
+ while ((read = getline(&line, &len, file)) != -1) {
+ // Skip non "cpu[0-9]" lines.
+ if (strnlen(line, read) < 4 || strncmp(line, "cpu", 3) != 0 || !isdigit(line[3])) {
+ free(line);
+ line = NULL;
+ len = 0;
+ continue;
+ }
+ vals = sscanf(line, "cpu%d %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64, &cpu_num, &user,
+ &nice, &system, &idle);
+
+ free(line);
+ line = NULL;
+ len = 0;
+
+ if (vals != 5) {
+ ALOGE("%s: failed to read CPU information from file: %s", __func__, strerror(errno));
+ fclose(file);
+ return errno ? -errno : -EIO;
+ }
+
+ active = user + nice + system;
+ total = active + idle;
+
+ // Read online CPU information.
+ snprintf(file_name, MAX_LENGTH, CPU_ONLINE_FILE_FORMAT, cpu_num);
+ cpu_file = fopen(file_name, "r");
+ online = 0;
+ if (cpu_file == NULL) {
+ ALOGE("%s: failed to open file: %s (%s)", __func__, file_name, strerror(errno));
+ // /sys/devices/system/cpu/cpu0/online is missing on some systems, because cpu0 can't
+ // be offline.
+ online = cpu_num == 0;
+ } else if (1 != fscanf(cpu_file, "%d", &online)) {
+ ALOGE("%s: failed to read CPU online information from file: %s (%s)", __func__,
+ file_name, strerror(errno));
+ fclose(file);
+ fclose(cpu_file);
+ return errno ? -errno : -EIO;
+ }
+ fclose(cpu_file);
+
+ if (list != NULL) {
+ list[size] = (cpu_usage_t) {
+ .name = CPU_LABEL,
+ .active = active,
+ .total = total,
+ .is_online = online
+ };
+ }
+
+ size++;
+ }
+
+ fclose(file);
+ return size;
+}
+
+static ssize_t get_cooling_devices(thermal_module_t *module, cooling_device_t *list, size_t size) {
+ return 0;
+}
+
+static struct hw_module_methods_t thermal_module_methods = {
+ .open = NULL,
+};
+
+thermal_module_t HAL_MODULE_INFO_SYM = {
+ .common = {
+ .tag = HARDWARE_MODULE_TAG,
+ .module_api_version = THERMAL_HARDWARE_MODULE_API_VERSION_0_1,
+ .hal_api_version = HARDWARE_HAL_API_VERSION,
+ .id = THERMAL_HARDWARE_MODULE_ID,
+ .name = "Default Thermal HAL",
+ .author = "The Android Open Source Project",
+ .methods = &thermal_module_methods,
+ },
+
+ .getTemperatures = get_temperatures,
+ .getCpuUsages = get_cpu_usages,
+ .getCoolingDevices = get_cooling_devices,
+};