+++ /dev/null
-/* drivers/rtc/alarm.c
- *
- * Copyright (C) 2007-2009 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/time.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/miscdevice.h>
-#include <linux/platform_device.h>
-#include <linux/rtc.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include "android_alarm.h"
-
-/* XXX - Hack out wakelocks, while they are out of tree */
-struct wake_lock {
- int i;
-};
-#define wake_lock(x)
-#define wake_lock_timeout(x, y)
-#define wake_unlock(x)
-#define WAKE_LOCK_SUSPEND 0
-#define wake_lock_init(x, y, z) ((x)->i = 1)
-#define wake_lock_destroy(x)
-
-#define ANDROID_ALARM_PRINT_ERROR (1U << 0)
-#define ANDROID_ALARM_PRINT_INIT_STATUS (1U << 1)
-#define ANDROID_ALARM_PRINT_TSET (1U << 2)
-#define ANDROID_ALARM_PRINT_CALL (1U << 3)
-#define ANDROID_ALARM_PRINT_SUSPEND (1U << 4)
-#define ANDROID_ALARM_PRINT_INT (1U << 5)
-#define ANDROID_ALARM_PRINT_FLOW (1U << 6)
-
-static int debug_mask = ANDROID_ALARM_PRINT_ERROR | \
- ANDROID_ALARM_PRINT_INIT_STATUS;
-module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
-
-#define pr_alarm(debug_level_mask, args...) \
- do { \
- if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
- pr_info(args); \
- } \
- } while (0)
-
-#define ANDROID_ALARM_WAKEUP_MASK ( \
- ANDROID_ALARM_RTC_WAKEUP_MASK | \
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
-
-/* support old userspace code */
-#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
-#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
-
-struct alarm_queue {
- struct rb_root alarms;
- struct rb_node *first;
- struct hrtimer timer;
- bool stopped;
- ktime_t stopped_time;
-};
-
-static struct rtc_device *alarm_rtc_dev;
-static DEFINE_SPINLOCK(alarm_slock);
-static DEFINE_MUTEX(alarm_setrtc_mutex);
-static struct wake_lock alarm_rtc_wake_lock;
-static struct platform_device *alarm_platform_dev;
-struct alarm_queue alarms[ANDROID_ALARM_TYPE_COUNT];
-static bool suspended;
-
-static void update_timer_locked(struct alarm_queue *base, bool head_removed)
-{
- struct android_alarm *alarm;
- bool is_wakeup = base == &alarms[ANDROID_ALARM_RTC_WAKEUP] ||
- base == &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
-
- if (base->stopped) {
- pr_alarm(FLOW, "changed alarm while setting the wall time\n");
- return;
- }
-
- if (is_wakeup && !suspended && head_removed)
- wake_unlock(&alarm_rtc_wake_lock);
-
- if (!base->first)
- return;
-
- alarm = container_of(base->first, struct android_alarm, node);
-
- pr_alarm(FLOW, "selected alarm, type %d, func %pF at %lld\n",
- alarm->type, alarm->function, ktime_to_ns(alarm->expires));
-
- if (is_wakeup && suspended) {
- pr_alarm(FLOW, "changed alarm while suspened\n");
- wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
- return;
- }
-
- hrtimer_try_to_cancel(&base->timer);
- base->timer.node.expires = alarm->expires;
- base->timer._softexpires = alarm->softexpires;
- hrtimer_start_expires(&base->timer, HRTIMER_MODE_ABS);
-}
-
-static void alarm_enqueue_locked(struct android_alarm *alarm)
-{
- struct alarm_queue *base = &alarms[alarm->type];
- struct rb_node **link = &base->alarms.rb_node;
- struct rb_node *parent = NULL;
- struct android_alarm *entry;
- int leftmost = 1;
- bool was_first = false;
-
- pr_alarm(FLOW, "added alarm, type %d, func %pF at %lld\n",
- alarm->type, alarm->function, ktime_to_ns(alarm->expires));
-
- if (base->first == &alarm->node) {
- base->first = rb_next(&alarm->node);
- was_first = true;
- }
- if (!RB_EMPTY_NODE(&alarm->node)) {
- rb_erase(&alarm->node, &base->alarms);
- RB_CLEAR_NODE(&alarm->node);
- }
-
- while (*link) {
- parent = *link;
- entry = rb_entry(parent, struct android_alarm, node);
- /*
- * We dont care about collisions. Nodes with
- * the same expiry time stay together.
- */
- if (alarm->expires.tv64 < entry->expires.tv64) {
- link = &(*link)->rb_left;
- } else {
- link = &(*link)->rb_right;
- leftmost = 0;
- }
- }
- if (leftmost)
- base->first = &alarm->node;
- if (leftmost || was_first)
- update_timer_locked(base, was_first);
-
- rb_link_node(&alarm->node, parent, link);
- rb_insert_color(&alarm->node, &base->alarms);
-}
-
-/**
- * android_alarm_init - initialize an alarm
- * @alarm: the alarm to be initialized
- * @type: the alarm type to be used
- * @function: alarm callback function
- */
-void android_alarm_init(struct android_alarm *alarm,
- enum android_alarm_type type, void (*function)(struct android_alarm *))
-{
- RB_CLEAR_NODE(&alarm->node);
- alarm->type = type;
- alarm->function = function;
-
- pr_alarm(FLOW, "created alarm, type %d, func %pF\n", type, function);
-}
-
-
-/**
- * android_alarm_start_range - (re)start an alarm
- * @alarm: the alarm to be added
- * @start: earliest expiry time
- * @end: expiry time
- */
-void android_alarm_start_range(struct android_alarm *alarm, ktime_t start,
- ktime_t end)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&alarm_slock, flags);
- alarm->softexpires = start;
- alarm->expires = end;
- alarm_enqueue_locked(alarm);
- spin_unlock_irqrestore(&alarm_slock, flags);
-}
-
-/**
- * android_alarm_try_to_cancel - try to deactivate an alarm
- * @alarm: alarm to stop
- *
- * Returns:
- * 0 when the alarm was not active
- * 1 when the alarm was active
- * -1 when the alarm may currently be excuting the callback function and
- * cannot be stopped (it may also be inactive)
- */
-int android_alarm_try_to_cancel(struct android_alarm *alarm)
-{
- struct alarm_queue *base = &alarms[alarm->type];
- unsigned long flags;
- bool first = false;
- int ret = 0;
-
- spin_lock_irqsave(&alarm_slock, flags);
- if (!RB_EMPTY_NODE(&alarm->node)) {
- pr_alarm(FLOW, "canceled alarm, type %d, func %pF at %lld\n",
- alarm->type, alarm->function,
- ktime_to_ns(alarm->expires));
- ret = 1;
- if (base->first == &alarm->node) {
- base->first = rb_next(&alarm->node);
- first = true;
- }
- rb_erase(&alarm->node, &base->alarms);
- RB_CLEAR_NODE(&alarm->node);
- if (first)
- update_timer_locked(base, true);
- } else
- pr_alarm(FLOW, "tried to cancel alarm, type %d, func %pF\n",
- alarm->type, alarm->function);
- spin_unlock_irqrestore(&alarm_slock, flags);
- if (!ret && hrtimer_callback_running(&base->timer))
- ret = -1;
- return ret;
-}
-
-/**
- * android_alarm_cancel - cancel an alarm and wait for the handler to finish.
- * @alarm: the alarm to be cancelled
- *
- * Returns:
- * 0 when the alarm was not active
- * 1 when the alarm was active
- */
-int android_alarm_cancel(struct android_alarm *alarm)
-{
- for (;;) {
- int ret = android_alarm_try_to_cancel(alarm);
- if (ret >= 0)
- return ret;
- cpu_relax();
- }
-}
-
-/**
- * alarm_set_rtc - set the kernel and rtc walltime
- * @new_time: timespec value containing the new time
- */
-int android_alarm_set_rtc(struct timespec new_time)
-{
- int i;
- int ret;
- unsigned long flags;
- struct rtc_time rtc_new_rtc_time;
- struct timespec tmp_time;
-
- rtc_time_to_tm(new_time.tv_sec, &rtc_new_rtc_time);
-
- pr_alarm(TSET, "set rtc %ld %ld - rtc %02d:%02d:%02d %02d/%02d/%04d\n",
- new_time.tv_sec, new_time.tv_nsec,
- rtc_new_rtc_time.tm_hour, rtc_new_rtc_time.tm_min,
- rtc_new_rtc_time.tm_sec, rtc_new_rtc_time.tm_mon + 1,
- rtc_new_rtc_time.tm_mday,
- rtc_new_rtc_time.tm_year + 1900);
-
- mutex_lock(&alarm_setrtc_mutex);
- spin_lock_irqsave(&alarm_slock, flags);
- wake_lock(&alarm_rtc_wake_lock);
- getnstimeofday(&tmp_time);
- for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
- hrtimer_try_to_cancel(&alarms[i].timer);
- alarms[i].stopped = true;
- alarms[i].stopped_time = timespec_to_ktime(tmp_time);
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
- ret = do_settimeofday(&new_time);
- spin_lock_irqsave(&alarm_slock, flags);
- for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
- alarms[i].stopped = false;
- update_timer_locked(&alarms[i], false);
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
- if (ret < 0) {
- pr_alarm(ERROR, "alarm_set_rtc: Failed to set time\n");
- goto err;
- }
- if (!alarm_rtc_dev) {
- pr_alarm(ERROR,
- "alarm_set_rtc: no RTC, time will be lost on reboot\n");
- goto err;
- }
- ret = rtc_set_time(alarm_rtc_dev, &rtc_new_rtc_time);
- if (ret < 0)
- pr_alarm(ERROR, "alarm_set_rtc: "
- "Failed to set RTC, time will be lost on reboot\n");
-err:
- wake_unlock(&alarm_rtc_wake_lock);
- mutex_unlock(&alarm_setrtc_mutex);
- return ret;
-}
-
-static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
-{
- struct alarm_queue *base;
- struct android_alarm *alarm;
- unsigned long flags;
- ktime_t now;
-
- spin_lock_irqsave(&alarm_slock, flags);
-
- base = container_of(timer, struct alarm_queue, timer);
- now = base->stopped ? base->stopped_time : hrtimer_cb_get_time(timer);
-
- pr_alarm(INT, "alarm_timer_triggered type %td at %lld\n",
- base - alarms, ktime_to_ns(now));
-
- while (base->first) {
- alarm = container_of(base->first, struct android_alarm, node);
- if (alarm->softexpires.tv64 > now.tv64) {
- pr_alarm(FLOW, "don't call alarm, %pF, %lld (s %lld)\n",
- alarm->function, ktime_to_ns(alarm->expires),
- ktime_to_ns(alarm->softexpires));
- break;
- }
- base->first = rb_next(&alarm->node);
- rb_erase(&alarm->node, &base->alarms);
- RB_CLEAR_NODE(&alarm->node);
- pr_alarm(CALL, "call alarm, type %d, func %pF, %lld (s %lld)\n",
- alarm->type, alarm->function,
- ktime_to_ns(alarm->expires),
- ktime_to_ns(alarm->softexpires));
- spin_unlock_irqrestore(&alarm_slock, flags);
- alarm->function(alarm);
- spin_lock_irqsave(&alarm_slock, flags);
- }
- if (!base->first)
- pr_alarm(FLOW, "no more alarms of type %td\n", base - alarms);
- update_timer_locked(base, true);
- spin_unlock_irqrestore(&alarm_slock, flags);
- return HRTIMER_NORESTART;
-}
-
-static void alarm_triggered_func(void *p)
-{
- struct rtc_device *rtc = alarm_rtc_dev;
- if (!(rtc->irq_data & RTC_AF))
- return;
- pr_alarm(INT, "rtc alarm triggered\n");
- wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
-}
-
-static int alarm_suspend(struct platform_device *pdev, pm_message_t state)
-{
- int err = 0;
- unsigned long flags;
- struct rtc_wkalrm rtc_alarm;
- struct rtc_time rtc_current_rtc_time;
- unsigned long rtc_current_time;
- unsigned long rtc_alarm_time;
- struct timespec rtc_delta;
- struct timespec wall_time;
- struct alarm_queue *wakeup_queue = NULL;
- struct alarm_queue *tmp_queue = NULL;
-
- pr_alarm(SUSPEND, "alarm_suspend(%p, %d)\n", pdev, state.event);
-
- spin_lock_irqsave(&alarm_slock, flags);
- suspended = true;
- spin_unlock_irqrestore(&alarm_slock, flags);
-
- hrtimer_cancel(&alarms[ANDROID_ALARM_RTC_WAKEUP].timer);
- hrtimer_cancel(&alarms[
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].timer);
-
- tmp_queue = &alarms[ANDROID_ALARM_RTC_WAKEUP];
- if (tmp_queue->first)
- wakeup_queue = tmp_queue;
- tmp_queue = &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
- if (tmp_queue->first && (!wakeup_queue ||
- hrtimer_get_expires(&tmp_queue->timer).tv64 <
- hrtimer_get_expires(&wakeup_queue->timer).tv64))
- wakeup_queue = tmp_queue;
- if (wakeup_queue) {
- rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
- getnstimeofday(&wall_time);
- rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
- set_normalized_timespec(&rtc_delta,
- wall_time.tv_sec - rtc_current_time,
- wall_time.tv_nsec);
-
- rtc_alarm_time = timespec_sub(ktime_to_timespec(
- hrtimer_get_expires(&wakeup_queue->timer)),
- rtc_delta).tv_sec;
-
- rtc_time_to_tm(rtc_alarm_time, &rtc_alarm.time);
- rtc_alarm.enabled = 1;
- rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
- rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
- rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
- pr_alarm(SUSPEND,
- "rtc alarm set at %ld, now %ld, rtc delta %ld.%09ld\n",
- rtc_alarm_time, rtc_current_time,
- rtc_delta.tv_sec, rtc_delta.tv_nsec);
- if (rtc_current_time + 1 >= rtc_alarm_time) {
- pr_alarm(SUSPEND, "alarm about to go off\n");
- memset(&rtc_alarm, 0, sizeof(rtc_alarm));
- rtc_alarm.enabled = 0;
- rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
-
- spin_lock_irqsave(&alarm_slock, flags);
- suspended = false;
- wake_lock_timeout(&alarm_rtc_wake_lock, 2 * HZ);
- update_timer_locked(&alarms[ANDROID_ALARM_RTC_WAKEUP],
- false);
- update_timer_locked(&alarms[
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP], false);
- err = -EBUSY;
- spin_unlock_irqrestore(&alarm_slock, flags);
- }
- }
- return err;
-}
-
-static int alarm_resume(struct platform_device *pdev)
-{
- struct rtc_wkalrm alarm;
- unsigned long flags;
-
- pr_alarm(SUSPEND, "alarm_resume(%p)\n", pdev);
-
- memset(&alarm, 0, sizeof(alarm));
- alarm.enabled = 0;
- rtc_set_alarm(alarm_rtc_dev, &alarm);
-
- spin_lock_irqsave(&alarm_slock, flags);
- suspended = false;
- update_timer_locked(&alarms[ANDROID_ALARM_RTC_WAKEUP], false);
- update_timer_locked(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP],
- false);
- spin_unlock_irqrestore(&alarm_slock, flags);
-
- return 0;
-}
-
-static struct rtc_task alarm_rtc_task = {
- .func = alarm_triggered_func
-};
-
-static int rtc_alarm_add_device(struct device *dev,
- struct class_interface *class_intf)
-{
- int err;
- struct rtc_device *rtc = to_rtc_device(dev);
-
- mutex_lock(&alarm_setrtc_mutex);
-
- if (alarm_rtc_dev) {
- err = -EBUSY;
- goto err1;
- }
-
- alarm_platform_dev =
- platform_device_register_simple("alarm", -1, NULL, 0);
- if (IS_ERR(alarm_platform_dev)) {
- err = PTR_ERR(alarm_platform_dev);
- goto err2;
- }
- err = rtc_irq_register(rtc, &alarm_rtc_task);
- if (err)
- goto err3;
- alarm_rtc_dev = rtc;
- pr_alarm(INIT_STATUS, "using rtc device, %s, for alarms", rtc->name);
- mutex_unlock(&alarm_setrtc_mutex);
-
- return 0;
-
-err3:
- platform_device_unregister(alarm_platform_dev);
-err2:
-err1:
- mutex_unlock(&alarm_setrtc_mutex);
- return err;
-}
-
-static void rtc_alarm_remove_device(struct device *dev,
- struct class_interface *class_intf)
-{
- if (dev == &alarm_rtc_dev->dev) {
- pr_alarm(INIT_STATUS, "lost rtc device for alarms");
- rtc_irq_unregister(alarm_rtc_dev, &alarm_rtc_task);
- platform_device_unregister(alarm_platform_dev);
- alarm_rtc_dev = NULL;
- }
-}
-
-static struct class_interface rtc_alarm_interface = {
- .add_dev = &rtc_alarm_add_device,
- .remove_dev = &rtc_alarm_remove_device,
-};
-
-static struct platform_driver alarm_driver = {
- .suspend = alarm_suspend,
- .resume = alarm_resume,
- .driver = {
- .name = "alarm"
- }
-};
-
-static int __init alarm_driver_init(void)
-{
- int err;
- int i;
-
- hrtimer_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].timer,
- CLOCK_REALTIME, HRTIMER_MODE_ABS);
- hrtimer_init(&alarms[ANDROID_ALARM_RTC].timer,
- CLOCK_REALTIME, HRTIMER_MODE_ABS);
- hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].timer,
- CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
- hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].timer,
- CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
- hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].timer,
- CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
-
- for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
- alarms[i].timer.function = alarm_timer_triggered;
-
- err = platform_driver_register(&alarm_driver);
- if (err < 0)
- goto err1;
- wake_lock_init(&alarm_rtc_wake_lock, WAKE_LOCK_SUSPEND, "alarm_rtc");
- rtc_alarm_interface.class = rtc_class;
- err = class_interface_register(&rtc_alarm_interface);
- if (err < 0)
- goto err2;
-
- return 0;
-
-err2:
- wake_lock_destroy(&alarm_rtc_wake_lock);
- platform_driver_unregister(&alarm_driver);
-err1:
- return err;
-}
-
-static void __exit alarm_exit(void)
-{
- class_interface_unregister(&rtc_alarm_interface);
- wake_lock_destroy(&alarm_rtc_wake_lock);
- platform_driver_unregister(&alarm_driver);
-}
-
-module_init(alarm_driver_init);
-module_exit(alarm_exit);
-
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