Promotion of qvr.lnx.3.0-00009.

CRs      Change ID                                   Subject
--------------------------------------------------------------------------------------------------------------
2053725   If315bc13408756b672ec368ec29d5dc28897029a   Implemantation of Thermal HAL

Change-Id: Ie0c27417940c752a6e962489754d478d4d7efab0
CRs-Fixed: 2053725

1 files changed, 183 insertions, 0 deletions

diff --git a/thermal.c b/thermal.c
new file mode 100644
index 0000000..5f2fb80
--- /dev/null
+++ b/thermal.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ * Not a contribution
+ * 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 <ctype.h>
+#include <errno.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 MAX_LENGTH                    50
+
+#define CPU_USAGE_FILE                "/proc/stat"
+#define CPU_ONLINE_FILE_FORMAT        "/sys/devices/system/cpu/cpu%d/online"
+#define CPU_PRESENT_FILE              "/sys/devices/system/cpu/present"
+
+const char * __attribute__ ((weak)) get_cpu_label(unsigned int cpu_num) {
+    static const char * cpu_label = "cpu";
+    return cpu_label;
+}
+
+size_t __attribute__ ((weak)) get_num_cpus() {
+    FILE *file;
+    char *line = NULL;
+    size_t len = 0;
+    static size_t cpus = 0;
+    ssize_t read;
+
+    if(cpus) return cpus;
+
+    file = fopen(CPU_PRESENT_FILE, "r");
+    if (file == NULL) {
+        ALOGE("%s: failed to open: %s", __func__, strerror(errno));
+        return 0;
+    }
+
+    if ((read = getline(&line, &len, file)) != -1) {
+        if (strnlen(line, read) < 3 || strncmp(line, "0-", 2) != 0 || !isdigit(line[2]))
+            ALOGE("%s: Incorrect cpu present file format", __func__);
+        else
+            cpus = atoi(&line[2]) + 1;
+
+        free(line);
+    }
+    else
+        ALOGE("%s: failed to read cpu present file: %s", __func__, strerror(errno));
+
+    fclose(file);
+    return cpus;
+}
+
+ssize_t __attribute__ ((weak)) get_temperatures(thermal_module_t *module, temperature_t *list, size_t size) {
+    return 0;
+}
+
+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;
+    size_t cpus = 0;
+    char file_name[MAX_LENGTH];
+    FILE *file;
+    FILE *cpu_file;
+
+    cpus = get_num_cpus();
+    if (!cpus)
+        return errno ? -errno : -EIO;
+
+    if (list == NULL)
+        return cpus;
+
+    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) {
+        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 || size == cpus) {
+            if (vals != 5) {
+                ALOGE("%s: failed to read CPU information from file: %s", __func__,
+                        strerror(errno));
+            } else {
+                ALOGE("/proc/stat file has incorrect format.");
+            }
+            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));
+            fclose(file);
+            return -errno;
+        }
+        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);
+
+        list[size] = (cpu_usage_t) {
+            .name = get_cpu_label(size),
+            .active = active,
+            .total = total,
+            .is_online = online
+        };
+
+        size++;
+    }
+    fclose(file);
+
+    if (size != cpus) {
+        ALOGE("/proc/stat file has incorrect format.");
+        return -EIO;
+    }
+
+    return cpus;
+}
+
+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 = "Thermal HAL",
+        .author = "The Android Open Source Project",
+        .methods = &thermal_module_methods,
+    },
+    .getTemperatures = get_temperatures,
+    .getCpuUsages = get_cpu_usages,
+};