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.

Change-Id: I0f60bec0d94c93c4f2a89ae86a1b0a0d04aa9e48
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>

5 files changed, 15 insertions, 172 deletions

diff --git a/drivers/rtc/qpnp-rtc.c b/drivers/rtc/qpnp-rtc.c
index bafcebb810de..af51225a9066 100644
--- a/drivers/rtc/qpnp-rtc.c
+++ b/drivers/rtc/qpnp-rtc.c
@@ -22,7 +22,6 @@
 #include <linux/spmi.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
-#include <linux/alarmtimer.h>
 
 /* RTC/ALARM Register offsets */
 #define REG_OFFSET_ALARM_RW	0x40
@@ -608,9 +607,6 @@ static int qpnp_rtc_probe(struct platform_device *pdev)
 		goto fail_rtc_enable;
 	}
 
-	/* Init power_on_alarm after adding rtc device */
-	power_on_alarm_init();
-
 	/* Request the alarm IRQ */
 	rc = request_any_context_irq(rtc_dd->rtc_alarm_irq,
 				 qpnp_alarm_trigger, IRQF_TRIGGER_RISING,
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 0548c572839c..1327a02ec778 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -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);
@@ -388,7 +387,6 @@ 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);
@@ -399,8 +397,7 @@ 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);
@@ -411,12 +408,13 @@ 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 });
 
@@ -488,10 +486,6 @@ 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;
 }
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
index 38a75b5d4792..9333ae59c8c8 100644
--- a/include/linux/alarmtimer.h
+++ b/include/linux/alarmtimer.h
@@ -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,
 };
@@ -50,9 +48,6 @@ void 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);
-void power_on_alarm_init(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);
diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
index 7fe799e867d4..e75e1b6ff27f 100644
--- a/include/uapi/linux/time.h
+++ b/include/uapi/linux/time.h
@@ -56,7 +56,6 @@ 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)
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 271b37995a89..4ac0a040e4ef 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -29,7 +29,6 @@
 #ifdef CONFIG_MSM_PM
 #include "lpm-levels.h"
 #endif
-#include <linux/workqueue.h>
 
 /**
  * struct alarm_base - Alarm timer bases
@@ -51,116 +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;
-static struct alarm init_alarm;
-
-/**
- * power_on_alarm_init - Init power on alarm value
- *
- * Read rtc alarm value after device booting up and add this alarm
- * into alarm queue.
- */
-void power_on_alarm_init(void)
-{
-	struct rtc_wkalrm rtc_alarm;
-	struct rtc_time rt;
-	unsigned long alarm_time;
-	struct rtc_device *rtc;
-	ktime_t alarm_ktime;
-
-	rtc = alarmtimer_get_rtcdev();
-
-	if (!rtc)
-		return;
-
-	rtc_read_alarm(rtc, &rtc_alarm);
-	rt = rtc_alarm.time;
-
-	rtc_tm_to_time(&rt, &alarm_time);
-
-	if (alarm_time) {
-		alarm_ktime = ktime_set(alarm_time, 0);
-		alarm_init(&init_alarm, ALARM_POWEROFF_REALTIME, NULL);
-		alarm_start(&init_alarm, alarm_ktime);
-	}
-}
-
-/**
- * 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);
-
-	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 = alarmtimer_get_rtcdev();
-	if (!rtc)
-		goto exit;
-
-	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(rtcdev, &alarm);
-	if (rc)
-		goto disable_alarm;
-
-	mutex_unlock(&power_on_alarm_lock);
-	return;
-
-disable_alarm:
-	rtc_alarm_irq_enable(rtcdev, 0);
-exit:
-	mutex_unlock(&power_on_alarm_lock);
-}
 
 static void alarmtimer_triggered_func(void *p)
 {
@@ -232,8 +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);
 }
 
@@ -260,14 +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
@@ -337,10 +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;
 
 }
@@ -434,8 +317,6 @@ 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);
@@ -492,7 +373,6 @@ static int alarmtimer_resume(struct device *dev)
 		return 0;
 	rtc_timer_cancel(rtc, &rtctimer);
 
-	queue_delayed_work(power_off_alarm_workqueue, &work, 0);
 	return 0;
 }
 
@@ -673,14 +553,12 @@ 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;
 }
 
@@ -1077,13 +955,10 @@ 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++) {
@@ -1105,24 +980,8 @@ 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: