staging: Remove the Android alarm-dev driver

The functionality provided by the Android alarm-dev driver
should now be present in the timerfd interface (thanks to
Greg Hackmann and Todd Poynor).

As of Lollipop, AOSP can make use of the timerfd if
alarm-dev is not present (though a fixup for setting the
rtc time if rtc0 isn't the backing for _ALARM clockids has
been applied post-Lollipop).

Thus, we should be able to remove alarm-dev from staging.

Cc: Greg Hackmann <ghackmann@google.com>
Cc: Elliott Hughes <enh@google.com>
Cc: Todd Poynor <toddpoynor@google.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Mark Salyzyn <salyzyn@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/Kconfig

@@ -45,15 +45,6 @@ config ANDROID_LOW_MEMORY_KILLER
 	---help---
 	  Registers processes to be killed when memory is low
 
-config ANDROID_INTF_ALARM_DEV
-	tristate "Android alarm driver"
-	depends on RTC_CLASS
-	default n
-	---help---
-	  Provides non-wakeup and rtc backed wakeup alarms based on rtc or
-	  elapsed realtime, and a non-wakeup alarm on the monotonic clock.
-	  Also exports the alarm interface to user-space.
-
 config SYNC
 	bool "Synchronization framework"
 	default n

drivers/staging/android/android_alarm.h

-/* include/linux/android_alarm.h
- *
- * Copyright (C) 2006-2007 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.
- *
- */
-
-#ifndef _LINUX_ANDROID_ALARM_H
-#define _LINUX_ANDROID_ALARM_H
-
-#include <linux/compat.h>
-#include <linux/ioctl.h>
-
-#include "uapi/android_alarm.h"
-
-#ifdef CONFIG_COMPAT
-#define ANDROID_ALARM_SET_COMPAT(type)		ALARM_IOW(2, type, \
-							struct compat_timespec)
-#define ANDROID_ALARM_SET_AND_WAIT_COMPAT(type)	ALARM_IOW(3, type, \
-							struct compat_timespec)
-#define ANDROID_ALARM_GET_TIME_COMPAT(type)	ALARM_IOW(4, type, \
-							struct compat_timespec)
-#define ANDROID_ALARM_SET_RTC_COMPAT		_IOW('a', 5, \
-							struct compat_timespec)
-#define ANDROID_ALARM_IOCTL_NR(cmd)		(_IOC_NR(cmd) & ((1<<4)-1))
-#define ANDROID_ALARM_COMPAT_TO_NORM(cmd)  \
-				ALARM_IOW(ANDROID_ALARM_IOCTL_NR(cmd), \
-					ANDROID_ALARM_IOCTL_TO_TYPE(cmd), \
-					struct timespec)
-
-#endif
-
-#endif

drivers/staging/android/uapi/android_alarm.h

-/* drivers/staging/android/uapi/android_alarm.h
- *
- * Copyright (C) 2006-2007 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.
- *
- */
-
-#ifndef _UAPI_LINUX_ANDROID_ALARM_H
-#define _UAPI_LINUX_ANDROID_ALARM_H
-
-#include <linux/ioctl.h>
-#include <linux/time.h>
-
-enum android_alarm_type {
-	/* return code bit numbers or set alarm arg */
-	ANDROID_ALARM_RTC_WAKEUP,
-	ANDROID_ALARM_RTC,
-	ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
-	ANDROID_ALARM_ELAPSED_REALTIME,
-	ANDROID_ALARM_SYSTEMTIME,
-
-	ANDROID_ALARM_TYPE_COUNT,
-
-	/* return code bit numbers */
-	/* ANDROID_ALARM_TIME_CHANGE = 16 */
-};
-
-enum android_alarm_return_flags {
-	ANDROID_ALARM_RTC_WAKEUP_MASK = 1U << ANDROID_ALARM_RTC_WAKEUP,
-	ANDROID_ALARM_RTC_MASK = 1U << ANDROID_ALARM_RTC,
-	ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK =
-				1U << ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
-	ANDROID_ALARM_ELAPSED_REALTIME_MASK =
-				1U << ANDROID_ALARM_ELAPSED_REALTIME,
-	ANDROID_ALARM_SYSTEMTIME_MASK = 1U << ANDROID_ALARM_SYSTEMTIME,
-	ANDROID_ALARM_TIME_CHANGE_MASK = 1U << 16
-};
-
-/* Disable alarm */
-#define ANDROID_ALARM_CLEAR(type)           _IO('a', 0 | ((type) << 4))
-
-/* Ack last alarm and wait for next */
-#define ANDROID_ALARM_WAIT                  _IO('a', 1)
-
-#define ALARM_IOW(c, type, size)            _IOW('a', (c) | ((type) << 4), size)
-/* Set alarm */
-#define ANDROID_ALARM_SET(type)             ALARM_IOW(2, type, struct timespec)
-#define ANDROID_ALARM_SET_AND_WAIT(type)    ALARM_IOW(3, type, struct timespec)
-#define ANDROID_ALARM_GET_TIME(type)        ALARM_IOW(4, type, struct timespec)
-#define ANDROID_ALARM_SET_RTC               _IOW('a', 5, struct timespec)
-#define ANDROID_ALARM_BASE_CMD(cmd)         (cmd & ~(_IOC(0, 0, 0xf0, 0)))
-#define ANDROID_ALARM_IOCTL_TO_TYPE(cmd)    (_IOC_NR(cmd) >> 4)
-
-#endif