healthd: Support alarm in power off charging mode

If there is rtc alarm during power off charging mode, reboot device
when alarm time is up.

Change-Id: Ifd763478606796731ddb11da3a3673d70f66b49b

healthd/Android.mk

@@ -1,7 +1,7 @@
 LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
-LOCAL_SRC_FILES := healthd_board_msm.cpp
+LOCAL_SRC_FILES := healthd_board_msm.cpp healthd_msm_alarm.cpp
 LOCAL_MODULE := libhealthd.msm
 LOCAL_CFLAGS := -Werror
 LOCAL_C_INCLUDES := system/core/healthd bootable/recovery

healthd/healthd_board_msm.cpp

@@ -37,7 +37,7 @@
 #include <cutils/android_reboot.h>
 #include <healthd.h>
 #include "minui/minui.h"
-
+#include "healthd_msm.h"
 #define ARRAY_SIZE(x)           (sizeof(x)/sizeof(x[0]))
 
 #define HVDCP_CHARGER           "USB_HVDCP"
@@ -315,6 +315,7 @@ void healthd_board_mode_charger_init()
 void healthd_board_init(struct healthd_config*)
 {
     // use defaults
+    power_off_alarm_init();
 }
 
 int healthd_board_battery_update(struct android::BatteryProperties*)

healthd/healthd_msm.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef _HEALTHD_MSM_H_
+#define _HEALTHD_MSM_H_
+void power_off_alarm_init(void);
+#endif /* _HEALTHD_MSM_H_ */

healthd/healthd_msm_alarm.cpp

@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2014 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 <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <cutils/android_reboot.h>
+#include <cutils/klog.h>
+#include <cutils/misc.h>
+#include <cutils/uevent.h>
+#include <cutils/properties.h>
+
+#include <pthread.h>
+#include <linux/android_alarm.h>
+#include <linux/rtc.h>
+#include <linux/time.h>
+#include <sys/epoll.h>
+#include <sys/timerfd.h>
+#include "healthd_msm.h"
+
+#define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0)
+#define LOGI(x...) do { KLOG_INFO("charger", x); } while (0)
+#define LOGV(x...) do { KLOG_DEBUG("charger", x); } while (0)
+#define LOGW(x...) do { KLOG_WARNING("charger", x); } while (0)
+enum alarm_time_type {
+    ALARM_TIME,
+    RTC_TIME,
+};
+
+/*
+ * shouldn't be changed after
+ * reading from alarm register
+ */
+static time_t alm_secs;
+
+static int alarm_get_time(enum alarm_time_type time_type,
+                          time_t *secs)
+{
+    struct tm tm;
+    unsigned int cmd;
+    int rc, fd = -1;
+
+    if (!secs)
+        return -1;
+
+    fd = open("/dev/rtc0", O_RDONLY);
+    if (fd < 0) {
+        LOGE("Can't open rtc devfs node\n");
+        return -1;
+    }
+
+    switch (time_type) {
+        case ALARM_TIME:
+            cmd = RTC_ALM_READ;
+            break;
+        case RTC_TIME:
+            cmd = RTC_RD_TIME;
+            break;
+        default:
+            LOGE("Invalid time type\n");
+            goto err;
+    }
+
+    rc = ioctl(fd, cmd, &tm);
+    if (rc < 0) {
+        LOGE("Unable to get time\n");
+        goto err;
+    }
+
+    *secs = mktime(&tm) + tm.tm_gmtoff;
+    if (*secs < 0) {
+        LOGE("Invalid seconds = %ld\n", *secs);
+        goto err;
+    }
+
+    close(fd);
+    return 0;
+
+err:
+    close(fd);
+    return -1;
+}
+
+#define ERR_SECS 2
+static int alarm_is_alm_expired()
+{
+    int rc;
+    time_t rtc_secs;
+
+    rc = alarm_get_time(RTC_TIME, &rtc_secs);
+    if (rc < 0)
+        return 0;
+
+    return (alm_secs >= rtc_secs - ERR_SECS &&
+            alm_secs <= rtc_secs + ERR_SECS) ? 1 : 0;
+}
+
+static int alarm_set_reboot_time_and_wait(time_t secs)
+{
+    int rc, epollfd, nevents;
+    int fd = 0;
+    struct timespec ts;
+    epoll_event event, events[1];
+    struct itimerspec itval;
+
+    epollfd = epoll_create(1);
+    if (epollfd < 0) {
+        LOGE("epoll_create failed\n");
+        goto err;
+    }
+
+    fd = timerfd_create(CLOCK_REALTIME_ALARM, 0);
+    if (fd < 0) {
+        LOGE("timerfd_create failed\n");
+        goto err;
+    }
+
+    event.events = EPOLLIN | EPOLLWAKEUP;
+    rc = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
+    if (rc < 0) {
+        LOGE("epoll_ctl(EPOLL_CTL_ADD) failed \n");
+        goto err;
+    }
+
+    itval.it_value.tv_sec = secs;
+    itval.it_value.tv_nsec = 0;
+
+    itval.it_interval.tv_sec = 0;
+    itval.it_interval.tv_nsec = 0;
+
+    rc = timerfd_settime(fd, TFD_TIMER_ABSTIME, &itval, NULL);
+    if (rc < 0) {
+        LOGE("timerfd_settime failed %d\n",rc);
+        goto err;
+    }
+
+    do {
+         nevents = epoll_wait(epollfd, events, 1, -1);
+    } while ((nevents < 0) || !alarm_is_alm_expired());
+
+    if (nevents <= 0) {
+        LOGE("Unable to wait on alarm\n");
+        goto err;
+    }
+
+    close(epollfd);
+    close(fd);
+    return 0;
+
+err:
+    if (epollfd > 0)
+        close(epollfd);
+
+    if (fd >= 0)
+        close(fd);
+    return -1;
+}
+
+static void *alarm_thread(void *)
+{
+    time_t rtc_secs, rb_secs;
+    int rc;
+
+    /*
+     * to support power off alarm, the time
+     * stored in alarm register at latest
+     * shutdown time should be some time
+     * earlier than the actual alarm time
+     * set by user
+     */
+    rc = alarm_get_time(ALARM_TIME, &alm_secs);
+    if (rc < 0 || !alm_secs)
+        goto err;
+
+    rc = alarm_set_reboot_time_and_wait(alm_secs);
+    if (rc < 0)
+        goto err;
+
+    LOGI("Exit from power off charging, reboot the phone!\n");
+    android_reboot(ANDROID_RB_RESTART2, 0, (char *)"rtc");
+
+err:
+    LOGE("Exit from alarm thread\n");
+    return NULL;
+}
+
+void power_off_alarm_init(void)
+{
+    pthread_t tid;
+    int rc;
+    char value[PROP_VALUE_MAX];
+
+    property_get("ro.bootmode", value, "");
+    if (!strcmp("charger", value)) {
+        rc = pthread_create(&tid, NULL, alarm_thread, NULL);
+        if (rc < 0)
+            LOGE("Create alarm thread failed\n");
+    }
+}