David Ng | da1fdc3 | 2018-03-22 23:44:56 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2014 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 <errno.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <time.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #include <sys/syscall.h> |
| 28 | #include <sys/reboot.h> |
| 29 | #include <sys/ioctl.h> |
| 30 | #include <cutils/klog.h> |
| 31 | #include <cutils/misc.h> |
| 32 | #include <cutils/uevent.h> |
| 33 | #include <cutils/properties.h> |
| 34 | #include <pthread.h> |
| 35 | #include <linux/rtc.h> |
| 36 | #include <linux/time.h> |
| 37 | #include <sys/epoll.h> |
| 38 | #include <sys/timerfd.h> |
| 39 | #include "healthd_msm.h" |
| 40 | |
| 41 | #define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0) |
| 42 | #define LOGI(x...) do { KLOG_INFO("charger", x); } while (0) |
| 43 | #define LOGV(x...) do { KLOG_DEBUG("charger", x); } while (0) |
| 44 | #define LOGW(x...) do { KLOG_WARNING("charger", x); } while (0) |
| 45 | enum alarm_time_type { |
| 46 | ALARM_TIME, |
| 47 | RTC_TIME, |
| 48 | }; |
| 49 | |
| 50 | static int alarm_get_time(enum alarm_time_type time_type, |
| 51 | time_t *secs) |
| 52 | { |
| 53 | struct tm tm; |
| 54 | unsigned int cmd; |
| 55 | int rc, fd = -1; |
| 56 | |
| 57 | if (!secs) |
| 58 | return -1; |
| 59 | |
| 60 | fd = open("/dev/rtc0", O_RDONLY); |
| 61 | if (fd < 0) { |
| 62 | LOGE("Can't open rtc devfs node\n"); |
| 63 | return -1; |
| 64 | } |
| 65 | |
| 66 | switch (time_type) { |
| 67 | case ALARM_TIME: |
| 68 | cmd = RTC_ALM_READ; |
| 69 | break; |
| 70 | case RTC_TIME: |
| 71 | cmd = RTC_RD_TIME; |
| 72 | break; |
| 73 | default: |
| 74 | LOGE("Invalid time type\n"); |
| 75 | goto err; |
| 76 | } |
| 77 | |
| 78 | rc = ioctl(fd, cmd, &tm); |
| 79 | if (rc < 0) { |
| 80 | LOGE("Unable to get time\n"); |
| 81 | goto err; |
| 82 | } |
| 83 | |
| 84 | *secs = mktime(&tm) + tm.tm_gmtoff; |
| 85 | if (*secs < 0) { |
| 86 | LOGE("Invalid seconds = %ld\n", *secs); |
| 87 | goto err; |
| 88 | } |
| 89 | |
| 90 | close(fd); |
| 91 | return 0; |
| 92 | |
| 93 | err: |
| 94 | close(fd); |
| 95 | return -1; |
| 96 | } |
| 97 | |
| 98 | static void alarm_reboot(void) |
| 99 | { |
| 100 | LOGI("alarm time is up, reboot the phone!\n"); |
| 101 | syscall(__NR_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, |
| 102 | LINUX_REBOOT_CMD_RESTART2, "rtc"); |
| 103 | } |
| 104 | |
| 105 | static int alarm_set_reboot_time_and_wait(time_t secs) |
| 106 | { |
| 107 | int rc, epollfd, nevents; |
| 108 | int fd = 0; |
| 109 | struct timespec ts; |
| 110 | epoll_event event, events[1]; |
| 111 | struct itimerspec itval; |
| 112 | |
| 113 | epollfd = epoll_create(1); |
| 114 | if (epollfd < 0) { |
| 115 | LOGE("epoll_create failed\n"); |
| 116 | goto err; |
| 117 | } |
| 118 | |
| 119 | fd = timerfd_create(CLOCK_REALTIME_ALARM, 0); |
| 120 | if (fd < 0) { |
| 121 | LOGE("timerfd_create failed\n"); |
| 122 | goto err; |
| 123 | } |
| 124 | |
| 125 | event.events = EPOLLIN | EPOLLWAKEUP; |
| 126 | event.data.ptr = (void *)alarm_reboot; |
| 127 | rc = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event); |
| 128 | if (rc < 0) { |
| 129 | LOGE("epoll_ctl(EPOLL_CTL_ADD) failed \n"); |
| 130 | goto err; |
| 131 | } |
| 132 | |
| 133 | itval.it_value.tv_sec = secs; |
| 134 | itval.it_value.tv_nsec = 0; |
| 135 | |
| 136 | itval.it_interval.tv_sec = 0; |
| 137 | itval.it_interval.tv_nsec = 0; |
| 138 | |
| 139 | rc = timerfd_settime(fd, TFD_TIMER_ABSTIME, &itval, NULL); |
| 140 | if (rc < 0) { |
| 141 | LOGE("timerfd_settime failed %d\n",rc); |
| 142 | goto err; |
| 143 | } |
| 144 | |
| 145 | nevents = epoll_wait(epollfd, events, 1, -1); |
| 146 | |
| 147 | if (nevents <= 0) { |
| 148 | LOGE("Unable to wait on alarm\n"); |
| 149 | goto err; |
| 150 | } else { |
| 151 | (*(void (*)())events[0].data.ptr)(); |
| 152 | } |
| 153 | |
| 154 | close(epollfd); |
| 155 | close(fd); |
| 156 | return 0; |
| 157 | |
| 158 | err: |
| 159 | if (epollfd > 0) |
| 160 | close(epollfd); |
| 161 | |
| 162 | if (fd >= 0) |
| 163 | close(fd); |
| 164 | return -1; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * 10s the estimated time from timestamp of alarm thread start |
| 169 | * to timestamp of android boot completed. |
| 170 | */ |
| 171 | #define TIME_DELTA 10 |
| 172 | |
| 173 | /* seconds of 1 minute*/ |
| 174 | #define ONE_MINUTE 60 |
| 175 | static void *alarm_thread(void *) |
| 176 | { |
| 177 | time_t rtc_secs, alarm_secs; |
| 178 | int rc; |
| 179 | timespec ts; |
| 180 | |
| 181 | /* |
| 182 | * to support power off alarm, the time |
| 183 | * stored in alarm register at latest |
| 184 | * shutdown time should be some time |
| 185 | * earlier than the actual alarm time |
| 186 | * set by user |
| 187 | */ |
| 188 | rc = alarm_get_time(ALARM_TIME, &alarm_secs); |
| 189 | if (rc < 0 || !alarm_secs) |
| 190 | goto err; |
| 191 | |
| 192 | rc = alarm_get_time(RTC_TIME, &rtc_secs); |
| 193 | if (rc < 0 || !rtc_secs) |
| 194 | goto err; |
| 195 | LOGI("alarm time in rtc is %ld, rtc time is %ld\n", alarm_secs, rtc_secs); |
| 196 | |
| 197 | if (alarm_secs <= rtc_secs) { |
| 198 | clock_gettime(CLOCK_BOOTTIME, &ts); |
| 199 | |
| 200 | /* |
| 201 | * It is possible that last power off alarm time is up at this point. |
| 202 | * (alarm_secs + ONE_MINUTE) is the final alarm time to fire. |
| 203 | * (rtc_secs + ts.tv_sec + TIME_DELTA) is the estimated time of next |
| 204 | * boot completed to fire alarm. |
| 205 | * If the final alarm time is less than the estimated time of next boot |
| 206 | * completed to fire, that means it is not able to fire the last power |
| 207 | * off alarm at the right time, so just miss it. |
| 208 | */ |
| 209 | if (alarm_secs + ONE_MINUTE < rtc_secs + ts.tv_sec + TIME_DELTA) { |
| 210 | LOGE("alarm is missed\n"); |
| 211 | goto err; |
| 212 | } |
| 213 | |
| 214 | alarm_reboot(); |
| 215 | } |
| 216 | |
| 217 | rc = alarm_set_reboot_time_and_wait(alarm_secs); |
| 218 | if (rc < 0) |
| 219 | goto err; |
| 220 | |
| 221 | err: |
| 222 | LOGE("Exit from alarm thread\n"); |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | void power_off_alarm_init(void) |
| 227 | { |
| 228 | pthread_t tid; |
| 229 | int rc; |
| 230 | char value[PROP_VALUE_MAX]; |
| 231 | |
| 232 | property_get("ro.bootmode", value, ""); |
| 233 | if (!strcmp("charger", value)) { |
| 234 | rc = pthread_create(&tid, NULL, alarm_thread, NULL); |
| 235 | if (rc < 0) |
| 236 | LOGE("Create alarm thread failed\n"); |
| 237 | } |
| 238 | } |