![John Stultz](/assets/img/avatar_default.png)
This patch fixes the following warnings: drivers/staging/android/alarm.c: In function ‘alarm_timer_triggered’: drivers/staging/android/alarm.c:344: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’ drivers/staging/android/alarm.c:367: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’ CC: Arve Hjønnevåg <arve@android.com> CC: Android Kernel Team <kernel-team@android.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
602 lines
17 KiB
C
602 lines
17 KiB
C
/* drivers/rtc/alarm.c
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*
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* Copyright (C) 2007-2009 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/time.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include "android_alarm.h"
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/* XXX - Hack out wakelocks, while they are out of tree */
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struct wake_lock {
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int i;
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};
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#define wake_lock(x)
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#define wake_lock_timeout(x, y)
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#define wake_unlock(x)
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#define WAKE_LOCK_SUSPEND 0
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#define wake_lock_init(x, y, z) ((x)->i = 1)
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#define wake_lock_destroy(x)
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#define ANDROID_ALARM_PRINT_ERROR (1U << 0)
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#define ANDROID_ALARM_PRINT_INIT_STATUS (1U << 1)
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#define ANDROID_ALARM_PRINT_TSET (1U << 2)
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#define ANDROID_ALARM_PRINT_CALL (1U << 3)
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#define ANDROID_ALARM_PRINT_SUSPEND (1U << 4)
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#define ANDROID_ALARM_PRINT_INT (1U << 5)
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#define ANDROID_ALARM_PRINT_FLOW (1U << 6)
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static int debug_mask = ANDROID_ALARM_PRINT_ERROR | \
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ANDROID_ALARM_PRINT_INIT_STATUS;
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module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
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#define pr_alarm(debug_level_mask, args...) \
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do { \
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if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
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pr_info(args); \
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} \
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} while (0)
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#define ANDROID_ALARM_WAKEUP_MASK ( \
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ANDROID_ALARM_RTC_WAKEUP_MASK | \
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
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/* support old usespace code */
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#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
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#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
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struct alarm_queue {
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struct rb_root alarms;
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struct rb_node *first;
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struct hrtimer timer;
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ktime_t delta;
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bool stopped;
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ktime_t stopped_time;
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};
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static struct rtc_device *alarm_rtc_dev;
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static DEFINE_SPINLOCK(alarm_slock);
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static DEFINE_MUTEX(alarm_setrtc_mutex);
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static struct wake_lock alarm_rtc_wake_lock;
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static struct platform_device *alarm_platform_dev;
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struct alarm_queue alarms[ANDROID_ALARM_TYPE_COUNT];
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static bool suspended;
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static void update_timer_locked(struct alarm_queue *base, bool head_removed)
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{
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struct android_alarm *alarm;
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bool is_wakeup = base == &alarms[ANDROID_ALARM_RTC_WAKEUP] ||
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base == &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
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if (base->stopped) {
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pr_alarm(FLOW, "changed alarm while setting the wall time\n");
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return;
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}
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if (is_wakeup && !suspended && head_removed)
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wake_unlock(&alarm_rtc_wake_lock);
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if (!base->first)
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return;
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alarm = container_of(base->first, struct android_alarm, node);
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pr_alarm(FLOW, "selected alarm, type %d, func %pF at %lld\n",
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alarm->type, alarm->function, ktime_to_ns(alarm->expires));
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if (is_wakeup && suspended) {
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pr_alarm(FLOW, "changed alarm while suspened\n");
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wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
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return;
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}
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hrtimer_try_to_cancel(&base->timer);
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base->timer.node.expires = ktime_add(base->delta, alarm->expires);
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base->timer._softexpires = ktime_add(base->delta, alarm->softexpires);
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hrtimer_start_expires(&base->timer, HRTIMER_MODE_ABS);
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}
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static void alarm_enqueue_locked(struct android_alarm *alarm)
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{
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struct alarm_queue *base = &alarms[alarm->type];
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struct rb_node **link = &base->alarms.rb_node;
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struct rb_node *parent = NULL;
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struct android_alarm *entry;
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int leftmost = 1;
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bool was_first = false;
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pr_alarm(FLOW, "added alarm, type %d, func %pF at %lld\n",
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alarm->type, alarm->function, ktime_to_ns(alarm->expires));
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if (base->first == &alarm->node) {
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base->first = rb_next(&alarm->node);
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was_first = true;
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}
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if (!RB_EMPTY_NODE(&alarm->node)) {
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rb_erase(&alarm->node, &base->alarms);
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RB_CLEAR_NODE(&alarm->node);
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}
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while (*link) {
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parent = *link;
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entry = rb_entry(parent, struct android_alarm, node);
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/*
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* We dont care about collisions. Nodes with
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* the same expiry time stay together.
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*/
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if (alarm->expires.tv64 < entry->expires.tv64) {
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link = &(*link)->rb_left;
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} else {
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link = &(*link)->rb_right;
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leftmost = 0;
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}
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}
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if (leftmost)
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base->first = &alarm->node;
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if (leftmost || was_first)
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update_timer_locked(base, was_first);
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rb_link_node(&alarm->node, parent, link);
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rb_insert_color(&alarm->node, &base->alarms);
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}
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/**
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* android_alarm_init - initialize an alarm
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* @alarm: the alarm to be initialized
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* @type: the alarm type to be used
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* @function: alarm callback function
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*/
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void android_alarm_init(struct android_alarm *alarm,
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enum android_alarm_type type, void (*function)(struct android_alarm *))
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{
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RB_CLEAR_NODE(&alarm->node);
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alarm->type = type;
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alarm->function = function;
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pr_alarm(FLOW, "created alarm, type %d, func %pF\n", type, function);
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}
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/**
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* android_alarm_start_range - (re)start an alarm
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* @alarm: the alarm to be added
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* @start: earliest expiry time
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* @end: expiry time
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*/
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void android_alarm_start_range(struct android_alarm *alarm, ktime_t start,
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ktime_t end)
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{
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unsigned long flags;
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spin_lock_irqsave(&alarm_slock, flags);
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alarm->softexpires = start;
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alarm->expires = end;
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alarm_enqueue_locked(alarm);
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spin_unlock_irqrestore(&alarm_slock, flags);
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}
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/**
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* android_alarm_try_to_cancel - try to deactivate an alarm
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* @alarm: alarm to stop
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*
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* Returns:
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* 0 when the alarm was not active
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* 1 when the alarm was active
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* -1 when the alarm may currently be excuting the callback function and
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* cannot be stopped (it may also be inactive)
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*/
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int android_alarm_try_to_cancel(struct android_alarm *alarm)
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{
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struct alarm_queue *base = &alarms[alarm->type];
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unsigned long flags;
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bool first = false;
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int ret = 0;
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spin_lock_irqsave(&alarm_slock, flags);
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if (!RB_EMPTY_NODE(&alarm->node)) {
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pr_alarm(FLOW, "canceled alarm, type %d, func %pF at %lld\n",
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alarm->type, alarm->function,
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ktime_to_ns(alarm->expires));
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ret = 1;
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if (base->first == &alarm->node) {
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base->first = rb_next(&alarm->node);
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first = true;
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}
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rb_erase(&alarm->node, &base->alarms);
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RB_CLEAR_NODE(&alarm->node);
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if (first)
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update_timer_locked(base, true);
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} else
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pr_alarm(FLOW, "tried to cancel alarm, type %d, func %pF\n",
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alarm->type, alarm->function);
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spin_unlock_irqrestore(&alarm_slock, flags);
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if (!ret && hrtimer_callback_running(&base->timer))
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ret = -1;
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return ret;
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}
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/**
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* android_alarm_cancel - cancel an alarm and wait for the handler to finish.
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* @alarm: the alarm to be cancelled
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*
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* Returns:
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* 0 when the alarm was not active
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* 1 when the alarm was active
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*/
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int android_alarm_cancel(struct android_alarm *alarm)
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{
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for (;;) {
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int ret = android_alarm_try_to_cancel(alarm);
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if (ret >= 0)
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return ret;
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cpu_relax();
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}
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}
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/**
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* alarm_set_rtc - set the kernel and rtc walltime
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* @new_time: timespec value containing the new time
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*/
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int android_alarm_set_rtc(struct timespec new_time)
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{
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int i;
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int ret;
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unsigned long flags;
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struct rtc_time rtc_new_rtc_time;
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struct timespec tmp_time;
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rtc_time_to_tm(new_time.tv_sec, &rtc_new_rtc_time);
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pr_alarm(TSET, "set rtc %ld %ld - rtc %02d:%02d:%02d %02d/%02d/%04d\n",
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new_time.tv_sec, new_time.tv_nsec,
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rtc_new_rtc_time.tm_hour, rtc_new_rtc_time.tm_min,
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rtc_new_rtc_time.tm_sec, rtc_new_rtc_time.tm_mon + 1,
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rtc_new_rtc_time.tm_mday,
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rtc_new_rtc_time.tm_year + 1900);
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mutex_lock(&alarm_setrtc_mutex);
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spin_lock_irqsave(&alarm_slock, flags);
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wake_lock(&alarm_rtc_wake_lock);
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getnstimeofday(&tmp_time);
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for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
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hrtimer_try_to_cancel(&alarms[i].timer);
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alarms[i].stopped = true;
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alarms[i].stopped_time = timespec_to_ktime(tmp_time);
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}
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alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].delta =
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alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta =
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ktime_sub(alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta,
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timespec_to_ktime(timespec_sub(tmp_time, new_time)));
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spin_unlock_irqrestore(&alarm_slock, flags);
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ret = do_settimeofday(&new_time);
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spin_lock_irqsave(&alarm_slock, flags);
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for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
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alarms[i].stopped = false;
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update_timer_locked(&alarms[i], false);
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}
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spin_unlock_irqrestore(&alarm_slock, flags);
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if (ret < 0) {
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pr_alarm(ERROR, "alarm_set_rtc: Failed to set time\n");
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goto err;
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}
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if (!alarm_rtc_dev) {
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pr_alarm(ERROR,
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"alarm_set_rtc: no RTC, time will be lost on reboot\n");
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goto err;
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}
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ret = rtc_set_time(alarm_rtc_dev, &rtc_new_rtc_time);
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if (ret < 0)
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pr_alarm(ERROR, "alarm_set_rtc: "
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"Failed to set RTC, time will be lost on reboot\n");
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err:
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wake_unlock(&alarm_rtc_wake_lock);
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mutex_unlock(&alarm_setrtc_mutex);
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return ret;
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}
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/**
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* alarm_get_elapsed_realtime - get the elapsed real time in ktime_t format
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*
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* returns the time in ktime_t format
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*/
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ktime_t alarm_get_elapsed_realtime(void)
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{
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ktime_t now;
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unsigned long flags;
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struct alarm_queue *base = &alarms[ANDROID_ALARM_ELAPSED_REALTIME];
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spin_lock_irqsave(&alarm_slock, flags);
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now = base->stopped ? base->stopped_time : ktime_get_real();
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now = ktime_sub(now, base->delta);
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spin_unlock_irqrestore(&alarm_slock, flags);
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return now;
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}
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static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
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{
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struct alarm_queue *base;
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struct android_alarm *alarm;
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unsigned long flags;
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ktime_t now;
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spin_lock_irqsave(&alarm_slock, flags);
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base = container_of(timer, struct alarm_queue, timer);
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now = base->stopped ? base->stopped_time : hrtimer_cb_get_time(timer);
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now = ktime_sub(now, base->delta);
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pr_alarm(INT, "alarm_timer_triggered type %ld at %lld\n",
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base - alarms, ktime_to_ns(now));
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while (base->first) {
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alarm = container_of(base->first, struct android_alarm, node);
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if (alarm->softexpires.tv64 > now.tv64) {
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pr_alarm(FLOW, "don't call alarm, %pF, %lld (s %lld)\n",
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alarm->function, ktime_to_ns(alarm->expires),
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ktime_to_ns(alarm->softexpires));
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break;
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}
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base->first = rb_next(&alarm->node);
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rb_erase(&alarm->node, &base->alarms);
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RB_CLEAR_NODE(&alarm->node);
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pr_alarm(CALL, "call alarm, type %d, func %pF, %lld (s %lld)\n",
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alarm->type, alarm->function,
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ktime_to_ns(alarm->expires),
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ktime_to_ns(alarm->softexpires));
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spin_unlock_irqrestore(&alarm_slock, flags);
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alarm->function(alarm);
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spin_lock_irqsave(&alarm_slock, flags);
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}
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if (!base->first)
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pr_alarm(FLOW, "no more alarms of type %ld\n", base - alarms);
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update_timer_locked(base, true);
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spin_unlock_irqrestore(&alarm_slock, flags);
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return HRTIMER_NORESTART;
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}
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static void alarm_triggered_func(void *p)
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{
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struct rtc_device *rtc = alarm_rtc_dev;
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if (!(rtc->irq_data & RTC_AF))
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return;
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pr_alarm(INT, "rtc alarm triggered\n");
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wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
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}
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static int alarm_suspend(struct platform_device *pdev, pm_message_t state)
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{
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int err = 0;
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unsigned long flags;
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struct rtc_wkalrm rtc_alarm;
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struct rtc_time rtc_current_rtc_time;
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unsigned long rtc_current_time;
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unsigned long rtc_alarm_time;
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struct timespec rtc_delta;
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struct timespec wall_time;
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struct alarm_queue *wakeup_queue = NULL;
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struct alarm_queue *tmp_queue = NULL;
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pr_alarm(SUSPEND, "alarm_suspend(%p, %d)\n", pdev, state.event);
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spin_lock_irqsave(&alarm_slock, flags);
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suspended = true;
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spin_unlock_irqrestore(&alarm_slock, flags);
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hrtimer_cancel(&alarms[ANDROID_ALARM_RTC_WAKEUP].timer);
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hrtimer_cancel(&alarms[
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].timer);
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tmp_queue = &alarms[ANDROID_ALARM_RTC_WAKEUP];
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if (tmp_queue->first)
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wakeup_queue = tmp_queue;
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tmp_queue = &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
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if (tmp_queue->first && (!wakeup_queue ||
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hrtimer_get_expires(&tmp_queue->timer).tv64 <
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hrtimer_get_expires(&wakeup_queue->timer).tv64))
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wakeup_queue = tmp_queue;
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if (wakeup_queue) {
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rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
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getnstimeofday(&wall_time);
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rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
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set_normalized_timespec(&rtc_delta,
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wall_time.tv_sec - rtc_current_time,
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wall_time.tv_nsec);
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rtc_alarm_time = timespec_sub(ktime_to_timespec(
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hrtimer_get_expires(&wakeup_queue->timer)),
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rtc_delta).tv_sec;
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rtc_time_to_tm(rtc_alarm_time, &rtc_alarm.time);
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rtc_alarm.enabled = 1;
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rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
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rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
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rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
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pr_alarm(SUSPEND,
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"rtc alarm set at %ld, now %ld, rtc delta %ld.%09ld\n",
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rtc_alarm_time, rtc_current_time,
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rtc_delta.tv_sec, rtc_delta.tv_nsec);
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if (rtc_current_time + 1 >= rtc_alarm_time) {
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pr_alarm(SUSPEND, "alarm about to go off\n");
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memset(&rtc_alarm, 0, sizeof(rtc_alarm));
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rtc_alarm.enabled = 0;
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rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
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spin_lock_irqsave(&alarm_slock, flags);
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suspended = false;
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wake_lock_timeout(&alarm_rtc_wake_lock, 2 * HZ);
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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_late_init(void)
|
|
{
|
|
unsigned long flags;
|
|
struct timespec tmp_time, system_time;
|
|
|
|
/* this needs to run after the rtc is read at boot */
|
|
spin_lock_irqsave(&alarm_slock, flags);
|
|
/* We read the current rtc and system time so we can later calulate
|
|
* elasped realtime to be (boot_systemtime + rtc - boot_rtc) ==
|
|
* (rtc - (boot_rtc - boot_systemtime))
|
|
*/
|
|
getnstimeofday(&tmp_time);
|
|
ktime_get_ts(&system_time);
|
|
alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].delta =
|
|
alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta =
|
|
timespec_to_ktime(timespec_sub(tmp_time, system_time));
|
|
|
|
spin_unlock_irqrestore(&alarm_slock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int __init alarm_driver_init(void)
|
|
{
|
|
int err;
|
|
int i;
|
|
|
|
for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
|
|
hrtimer_init(&alarms[i].timer,
|
|
CLOCK_REALTIME, HRTIMER_MODE_ABS);
|
|
alarms[i].timer.function = alarm_timer_triggered;
|
|
}
|
|
hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].timer,
|
|
CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
|
alarms[ANDROID_ALARM_SYSTEMTIME].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);
|
|
}
|
|
|
|
late_initcall(alarm_late_init);
|
|
module_init(alarm_driver_init);
|
|
module_exit(alarm_exit);
|
|
|