| /* |
| * 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. |
| */ |
| |
| #define LOG_TAG "healthd-dragon" |
| #include <healthd/healthd.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <cutils/klog.h> |
| #include <sys/types.h> |
| |
| #define PSU_SYSFS_PATH "/sys/class/power_supply/bq27742-0" |
| #define PSU_SYSFS_MAX_CURRENT_PATH PSU_SYSFS_PATH "/current_max" |
| #define BATTERY_CRITICAL_LOW_CAP 10 |
| #define BATTERY_CRITICAL_LOW_IMAX_MA 5000 |
| #define BATTERY_MAX_IMAX_MA 9000 |
| |
| using namespace android; |
| |
| static int read_sysfs(const char *path, char *buf, size_t size) { |
| char *cp = NULL; |
| |
| int fd = open(path, O_RDONLY); |
| if (fd == -1) { |
| KLOG_ERROR(LOG_TAG, "Could not open '%s'\n", path); |
| return -1; |
| } |
| |
| ssize_t count = TEMP_FAILURE_RETRY(read(fd, buf, size)); |
| if (count > 0) |
| cp = (char *)memrchr(buf, '\n', count); |
| |
| if (cp) |
| *cp = '\0'; |
| else |
| buf[0] = '\0'; |
| |
| close(fd); |
| return count; |
| } |
| |
| static int read_current_max_ma() { |
| const int SIZE = 10; |
| char buf[SIZE]; |
| if (read_sysfs(PSU_SYSFS_MAX_CURRENT_PATH, buf, SIZE) > 0) |
| return atoi(buf) / 1000; |
| |
| return 0; |
| } |
| |
| static void dragon_soc_adjust(struct BatteryProperties *props) |
| { |
| int soc; |
| int current_max_ma; |
| |
| soc = props->batteryLevel; |
| /* |
| * if not charging and State-Of-Charge (soc) is below |
| * BATTERY_CRITICAL_LOW_CAP shrink soc based on imax value |
| */ |
| if ((soc < BATTERY_CRITICAL_LOW_CAP) && |
| ((props->batteryStatus == BATTERY_STATUS_DISCHARGING) || |
| (props->batteryStatus == BATTERY_STATUS_NOT_CHARGING) || |
| (props->batteryStatus == BATTERY_STATUS_UNKNOWN))) { |
| |
| current_max_ma = read_current_max_ma(); |
| if (current_max_ma == 0) |
| /* |
| * Either it failed to read sysfs or its really zero. In either |
| * case lets just warn so logs will identify for further debug. |
| */ |
| KLOG_WARNING(LOG_TAG, "imax=0\n"); |
| else if (current_max_ma < BATTERY_CRITICAL_LOW_IMAX_MA) |
| /* force shutdown */ |
| soc = 0; |
| else if (current_max_ma < BATTERY_MAX_IMAX_MA) |
| /* decrease soc towards zero */ |
| soc = soc * current_max_ma / BATTERY_MAX_IMAX_MA; |
| |
| KLOG_INFO(LOG_TAG, "imax=%d soc=%d\n", current_max_ma, soc); |
| } |
| props->batteryLevel = soc; |
| } |
| |
| int healthd_board_battery_update(struct BatteryProperties *props) |
| { |
| |
| dragon_soc_adjust(props); |
| |
| // return 0 to log periodic polled battery status to kernel log |
| return 0; |
| } |
| |
| void healthd_board_init(struct healthd_config *config) {} |