blob: d30e771eab72a92a6674cb156d8dd12989004f0e [file] [log] [blame]
/*
* Copyright (C) 2013 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"
#define KLOG_LEVEL 6
#include "healthd.h"
#include "BatteryMonitor.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <batteryservice/BatteryService.h>
#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <cutils/klog.h>
#include <cutils/uevent.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
using namespace android;
// Periodic chores intervals in seconds
#define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
#define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)
static struct healthd_config healthd_config = {
.periodic_chores_interval_fast = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST,
.periodic_chores_interval_slow = DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW,
.batteryStatusPath = String8(String8::kEmptyString),
.batteryHealthPath = String8(String8::kEmptyString),
.batteryPresentPath = String8(String8::kEmptyString),
.batteryCapacityPath = String8(String8::kEmptyString),
.batteryVoltagePath = String8(String8::kEmptyString),
.batteryTemperaturePath = String8(String8::kEmptyString),
.batteryTechnologyPath = String8(String8::kEmptyString),
.batteryCurrentNowPath = String8(String8::kEmptyString),
.batteryChargeCounterPath = String8(String8::kEmptyString),
};
#define POWER_SUPPLY_SUBSYSTEM "power_supply"
// epoll events: uevent, wakealarm, binder
#define MAX_EPOLL_EVENTS 3
static int uevent_fd;
static int wakealarm_fd;
static int binder_fd;
// -1 for no epoll timeout
static int awake_poll_interval = -1;
static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
static BatteryMonitor* gBatteryMonitor;
static bool nosvcmgr;
static void wakealarm_set_interval(int interval) {
struct itimerspec itval;
if (wakealarm_fd == -1)
return;
wakealarm_wake_interval = interval;
if (interval == -1)
interval = 0;
itval.it_interval.tv_sec = interval;
itval.it_interval.tv_nsec = 0;
itval.it_value.tv_sec = interval;
itval.it_value.tv_nsec = 0;
if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
}
static void battery_update(void) {
// Fast wake interval when on charger (watch for overheat);
// slow wake interval when on battery (watch for drained battery).
int new_wake_interval = gBatteryMonitor->update() ?
healthd_config.periodic_chores_interval_fast :
healthd_config.periodic_chores_interval_slow;
if (new_wake_interval != wakealarm_wake_interval)
wakealarm_set_interval(new_wake_interval);
// During awake periods poll at fast rate. If wake alarm is set at fast
// rate then just use the alarm; if wake alarm is set at slow rate then
// poll at fast rate while awake and let alarm wake up at slow rate when
// asleep.
if (healthd_config.periodic_chores_interval_fast == -1)
awake_poll_interval = -1;
else
awake_poll_interval =
new_wake_interval == healthd_config.periodic_chores_interval_fast ?
-1 : healthd_config.periodic_chores_interval_fast * 1000;
}
static void periodic_chores() {
battery_update();
}
static void uevent_init(void) {
uevent_fd = uevent_open_socket(64*1024, true);
if (uevent_fd >= 0)
fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
else
KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
}
#define UEVENT_MSG_LEN 2048
static void uevent_event(void) {
char msg[UEVENT_MSG_LEN+2];
char *cp;
int n;
n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
if (n <= 0)
return;
if (n >= UEVENT_MSG_LEN) /* overflow -- discard */
return;
msg[n] = '\0';
msg[n+1] = '\0';
cp = msg;
while (*cp) {
if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
battery_update();
break;
}
/* advance to after the next \0 */
while (*cp++)
;
}
}
static void wakealarm_init(void) {
wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
if (wakealarm_fd == -1) {
KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
return;
}
wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
}
static void wakealarm_event(void) {
unsigned long long wakeups;
if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm_fd failed\n");
return;
}
periodic_chores();
}
static void binder_init(void) {
ProcessState::self()->setThreadPoolMaxThreadCount(0);
IPCThreadState::self()->disableBackgroundScheduling(true);
IPCThreadState::self()->setupPolling(&binder_fd);
}
static void binder_event(void) {
IPCThreadState::self()->handlePolledCommands();
}
static void healthd_mainloop(void) {
struct epoll_event ev;
int epollfd;
int maxevents = 0;
epollfd = epoll_create(MAX_EPOLL_EVENTS);
if (epollfd == -1) {
KLOG_ERROR(LOG_TAG,
"healthd_mainloop: epoll_create failed; errno=%d\n",
errno);
return;
}
if (uevent_fd >= 0) {
ev.events = EPOLLIN | EPOLLWAKEUP;
ev.data.ptr = (void *)uevent_event;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, uevent_fd, &ev) == -1)
KLOG_ERROR(LOG_TAG,
"healthd_mainloop: epoll_ctl for uevent_fd failed; errno=%d\n",
errno);
else
maxevents++;
}
if (wakealarm_fd >= 0) {
ev.events = EPOLLIN | EPOLLWAKEUP;
ev.data.ptr = (void *)wakealarm_event;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, wakealarm_fd, &ev) == -1)
KLOG_ERROR(LOG_TAG,
"healthd_mainloop: epoll_ctl for wakealarm_fd failed; errno=%d\n",
errno);
else
maxevents++;
}
if (binder_fd >= 0) {
ev.events = EPOLLIN | EPOLLWAKEUP;
ev.data.ptr= (void *)binder_event;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, binder_fd, &ev) == -1)
KLOG_ERROR(LOG_TAG,
"healthd_mainloop: epoll_ctl for binder_fd failed; errno=%d\n",
errno);
else
maxevents++;
}
while (1) {
struct epoll_event events[maxevents];
int nevents;
IPCThreadState::self()->flushCommands();
nevents = epoll_wait(epollfd, events, maxevents, awake_poll_interval);
if (nevents == -1) {
if (errno == EINTR)
continue;
KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
break;
}
for (int n = 0; n < nevents; ++n) {
if (events[n].data.ptr)
(*(void (*)())events[n].data.ptr)();
}
if (!nevents)
periodic_chores();
}
return;
}
int main(int argc, char **argv) {
int ch;
klog_set_level(KLOG_LEVEL);
while ((ch = getopt(argc, argv, "n")) != -1) {
switch (ch) {
case 'n':
nosvcmgr = true;
break;
case '?':
default:
KLOG_WARNING(LOG_TAG, "Unrecognized healthd option: %c\n", ch);
}
}
healthd_board_init(&healthd_config);
wakealarm_init();
uevent_init();
binder_init();
gBatteryMonitor = new BatteryMonitor();
gBatteryMonitor->init(&healthd_config, nosvcmgr);
healthd_mainloop();
return 0;
}