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Commit 3f8342d6 authored by Mao Jinlong's avatar Mao Jinlong
Browse files

Revert "rtc: alarm: Add power-on alarm feature" 



This reverts commit 2e1a4aefef66db901f9a906b79e30187f10dbecb.

Power off alarm is not set via alarmtimer now. Remove the changes
of power off alarm's previous design.

CRs-Fixed: 2132189
Change-Id: I0f60bec0d94c93c4f2a89ae86a1b0a0d04aa9e48
Signed-off-by: default avatarMao Jinlong <jinlmao@codeaurora.org>
parent 203023cb

fs/timerfd.c

+13 −19
Original line number Diff line number Diff line
@@ -50,8 +50,7 @@ static DEFINE_SPINLOCK(cancel_lock); 
static inline bool isalarm(struct timerfd_ctx *ctx)

{

	return ctx->clockid == CLOCK_REALTIME_ALARM ||

		ctx->clockid == CLOCK_BOOTTIME_ALARM ||

		ctx->clockid == CLOCK_POWEROFF_ALARM;

		ctx->clockid == CLOCK_BOOTTIME_ALARM;

}



/*
@@ -143,8 +142,7 @@ static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags) 
{

	spin_lock(&ctx->cancel_lock);

	if ((ctx->clockid == CLOCK_REALTIME ||

	     ctx->clockid == CLOCK_REALTIME_ALARM ||

	     ctx->clockid == CLOCK_POWEROFF_ALARM) &&

	     ctx->clockid == CLOCK_REALTIME_ALARM) &&

	    (flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) {

		if (!ctx->might_cancel) {

			ctx->might_cancel = true;
@@ -176,7 +174,6 @@ static int timerfd_setup(struct timerfd_ctx *ctx, int flags, 
	enum hrtimer_mode htmode;

	ktime_t texp;

	int clockid = ctx->clockid;

	enum alarmtimer_type type;



	htmode = (flags & TFD_TIMER_ABSTIME) ?

		HRTIMER_MODE_ABS: HRTIMER_MODE_REL;
@@ -187,8 +184,10 @@ static int timerfd_setup(struct timerfd_ctx *ctx, int flags, 
	ctx->tintv = timespec_to_ktime(ktmr->it_interval);



	if (isalarm(ctx)) {

		type = clock2alarm(ctx->clockid);

		alarm_init(&ctx->t.alarm, type, timerfd_alarmproc);

		alarm_init(&ctx->t.alarm,

			   ctx->clockid == CLOCK_REALTIME_ALARM ?

			   ALARM_REALTIME : ALARM_BOOTTIME,

			   timerfd_alarmproc);

	} else {

		hrtimer_init(&ctx->t.tmr, clockid, htmode);

		hrtimer_set_expires(&ctx->t.tmr, texp);
@@ -387,7 +386,6 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) 
{

	int ufd;

	struct timerfd_ctx *ctx;

	enum alarmtimer_type type;



	/* Check the TFD_* constants for consistency.  */

	BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
@@ -398,8 +396,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) 
	     clockid != CLOCK_REALTIME &&

	     clockid != CLOCK_REALTIME_ALARM &&

	     clockid != CLOCK_BOOTTIME &&

	     clockid != CLOCK_BOOTTIME_ALARM &&

	     clockid != CLOCK_POWEROFF_ALARM))

	     clockid != CLOCK_BOOTTIME_ALARM))

		return -EINVAL;



	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@@ -410,12 +407,13 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) 
	spin_lock_init(&ctx->cancel_lock);

	ctx->clockid = clockid;



	if (isalarm(ctx)) {

		type = clock2alarm(ctx->clockid);

		alarm_init(&ctx->t.alarm, type, timerfd_alarmproc);

	} else {

	if (isalarm(ctx))

		alarm_init(&ctx->t.alarm,

			   ctx->clockid == CLOCK_REALTIME_ALARM ?

			   ALARM_REALTIME : ALARM_BOOTTIME,

			   timerfd_alarmproc);

	else

		hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS);

	}



	ctx->moffs = ktime_mono_to_real((ktime_t){ .tv64 = 0 });
@@ -487,10 +485,6 @@ static int do_timerfd_settime(int ufd, int flags, 
	ret = timerfd_setup(ctx, flags, new);



	spin_unlock_irq(&ctx->wqh.lock);



	if (ctx->clockid == CLOCK_POWEROFF_ALARM)

		set_power_on_alarm();



	fdput(f);

	return ret;

}

include/linux/alarmtimer.h

+0 −4
Original line number Diff line number Diff line
@@ -5,12 +5,10 @@ 
#include <linux/hrtimer.h>

#include <linux/timerqueue.h>

#include <linux/rtc.h>

#include <linux/types.h>



enum alarmtimer_type {

	ALARM_REALTIME,

	ALARM_BOOTTIME,

	ALARM_POWEROFF_REALTIME,



	ALARM_NUMTYPE,

};
@@ -50,8 +48,6 @@ int alarm_start_relative(struct alarm *alarm, ktime_t start); 
void alarm_restart(struct alarm *alarm);

int alarm_try_to_cancel(struct alarm *alarm);

int alarm_cancel(struct alarm *alarm);

void set_power_on_alarm(void);

enum alarmtimer_type clock2alarm(clockid_t clockid);



u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);

u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);

include/uapi/linux/time.h

+0 −1
Original line number Diff line number Diff line
@@ -60,7 +60,6 @@ struct itimerval { 
#define CLOCK_BOOTTIME_ALARM		9

#define CLOCK_SGI_CYCLE			10	/* Hardware specific */

#define CLOCK_TAI			11

#define CLOCK_POWEROFF_ALARM		12



#define MAX_CLOCKS			16

#define CLOCKS_MASK			(CLOCK_REALTIME | CLOCK_MONOTONIC)

kernel/time/alarmtimer.c

+2 −112
Original line number Diff line number Diff line
@@ -29,7 +29,6 @@ 
#ifdef CONFIG_MSM_PM

#include "lpm-levels.h"

#endif

#include <linux/workqueue.h>



/**

 * struct alarm_base - Alarm timer bases
@@ -51,84 +50,12 @@ static ktime_t freezer_delta; 
static DEFINE_SPINLOCK(freezer_delta_lock);



static struct wakeup_source *ws;

static struct delayed_work work;

static struct workqueue_struct *power_off_alarm_workqueue;



#ifdef CONFIG_RTC_CLASS

/* rtc timer and device for setting alarm wakeups at suspend */

static struct rtc_timer		rtctimer;

static struct rtc_device	*rtcdev;

static DEFINE_SPINLOCK(rtcdev_lock);

static struct mutex power_on_alarm_lock;



/**

 * set_power_on_alarm - set power on alarm value into rtc register

 *

 * Get the soonest power off alarm timer and set the alarm value into rtc

 * register.

 */

void set_power_on_alarm(void)

{

	int rc;

	struct timespec wall_time, alarm_ts;

	long alarm_secs = 0l;

	long rtc_secs, alarm_time, alarm_delta;

	struct rtc_time rtc_time;

	struct rtc_wkalrm alarm;

	struct rtc_device *rtc;

	struct timerqueue_node *next;

	unsigned long flags;

	struct alarm_base *base = &alarm_bases[ALARM_POWEROFF_REALTIME];



	rc = mutex_lock_interruptible(&power_on_alarm_lock);

	if (rc != 0)

		return;



	spin_lock_irqsave(&base->lock, flags);

	next = timerqueue_getnext(&base->timerqueue);

	spin_unlock_irqrestore(&base->lock, flags);



	rtc = alarmtimer_get_rtcdev();

	if (!rtc)

		goto exit;



	if (next) {

		alarm_ts = ktime_to_timespec(next->expires);

		alarm_secs = alarm_ts.tv_sec;

	}



	if (!alarm_secs)

		goto disable_alarm;



	getnstimeofday(&wall_time);



	/*

	 * alarm_secs have to be bigger than "wall_time +1".

	 * It is to make sure that alarm time will be always

	 * bigger than wall time.

	*/

	if (alarm_secs <= wall_time.tv_sec + 1)

		goto disable_alarm;



	rtc_read_time(rtc, &rtc_time);

	rtc_tm_to_time(&rtc_time, &rtc_secs);

	alarm_delta = wall_time.tv_sec - rtc_secs;

	alarm_time = alarm_secs - alarm_delta;



	rtc_time_to_tm(alarm_time, &alarm.time);

	alarm.enabled = 1;

	rc = rtc_set_alarm(rtc, &alarm);

	if (rc)

		goto disable_alarm;



	mutex_unlock(&power_on_alarm_lock);

	return;



disable_alarm:

	rtc_timer_cancel(rtc, &rtc->aie_timer);

exit:

	mutex_unlock(&power_on_alarm_lock);

}



static void alarmtimer_triggered_func(void *p)

{
@@ -200,8 +127,6 @@ static void alarmtimer_rtc_remove_device(struct device *dev, 


static inline void alarmtimer_rtc_timer_init(void)

{

	mutex_init(&power_on_alarm_lock);



	rtc_timer_init(&rtctimer, NULL, NULL);

}
@@ -228,14 +153,8 @@ struct rtc_device *alarmtimer_get_rtcdev(void) 
static inline int alarmtimer_rtc_interface_setup(void) { return 0; }

static inline void alarmtimer_rtc_interface_remove(void) { }

static inline void alarmtimer_rtc_timer_init(void) { }

void set_power_on_alarm(void) { }

#endif



static void alarm_work_func(struct work_struct *unused)

{

	set_power_on_alarm();

}



/**

 * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue

 * @base: pointer to the base where the timer is being run
@@ -305,10 +224,6 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer) 
	}

	spin_unlock_irqrestore(&base->lock, flags);



	/* set next power off alarm */

	if (alarm->type == ALARM_POWEROFF_REALTIME)

		queue_delayed_work(power_off_alarm_workqueue, &work, 0);



	return ret;



}
@@ -341,8 +256,6 @@ static int alarmtimer_suspend(struct device *dev) 
	int i;

	int ret = 0;



	cancel_delayed_work_sync(&work);



	spin_lock_irqsave(&freezer_delta_lock, flags);

	min = freezer_delta;

	freezer_delta = ktime_set(0, 0);
@@ -406,8 +319,6 @@ static int alarmtimer_suspend(struct device *dev) 
	int i;

	int ret;



	cancel_delayed_work_sync(&work);



	spin_lock_irqsave(&freezer_delta_lock, flags);

	min = freezer_delta;

	freezer_delta = ktime_set(0, 0);
@@ -651,14 +562,12 @@ EXPORT_SYMBOL_GPL(alarm_forward_now); 
 * clock2alarm - helper that converts from clockid to alarmtypes

 * @clockid: clockid.

 */

enum alarmtimer_type clock2alarm(clockid_t clockid)

static enum alarmtimer_type clock2alarm(clockid_t clockid)

{

	if (clockid == CLOCK_REALTIME_ALARM)

		return ALARM_REALTIME;

	if (clockid == CLOCK_BOOTTIME_ALARM)

		return ALARM_BOOTTIME;

	if (clockid == CLOCK_POWEROFF_ALARM)

		return ALARM_POWEROFF_REALTIME;

	return -1;

}
@@ -1054,13 +963,10 @@ static int __init alarmtimer_init(void) 


	posix_timers_register_clock(CLOCK_REALTIME_ALARM, &alarm_clock);

	posix_timers_register_clock(CLOCK_BOOTTIME_ALARM, &alarm_clock);

	posix_timers_register_clock(CLOCK_POWEROFF_ALARM, &alarm_clock);



	/* Initialize alarm bases */

	alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;

	alarm_bases[ALARM_REALTIME].gettime = &ktime_get_real;

	alarm_bases[ALARM_POWEROFF_REALTIME].base_clockid = CLOCK_REALTIME;

	alarm_bases[ALARM_POWEROFF_REALTIME].gettime = &ktime_get_real;

	alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;

	alarm_bases[ALARM_BOOTTIME].gettime = &ktime_get_boottime;

	for (i = 0; i < ALARM_NUMTYPE; i++) {
@@ -1082,24 +988,8 @@ static int __init alarmtimer_init(void) 
		goto out_drv;

	}

	ws = wakeup_source_register("alarmtimer");

	if (!ws) {

		error = -ENOMEM;

		goto out_ws;

	}



	INIT_DELAYED_WORK(&work, alarm_work_func);

	power_off_alarm_workqueue =

		create_singlethread_workqueue("power_off_alarm");

	if (!power_off_alarm_workqueue) {

		error = -ENOMEM;

		goto out_wq;

	}



	return 0;

out_wq:

	wakeup_source_unregister(ws);

out_ws:

	platform_device_unregister(pdev);



out_drv:

	platform_driver_unregister(&alarmtimer_driver);

out_if: