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Message-Id: <1421790155-3309-1-git-send-email-john.stultz@linaro.org>
Date: Tue, 20 Jan 2015 13:42:34 -0800
From: John Stultz <john.stultz@...aro.org>
To: lkml <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Greg Hackmann <ghackmann@...gle.com>,
Elliott Hughes <enh@...gle.com>,
Todd Poynor <toddpoynor@...gle.com>,
Android Kernel Team <kernel-team@...roid.com>,
Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 1/2][RFC] 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@...gle.com>
Cc: Elliott Hughes <enh@...gle.com>
Cc: Todd Poynor <toddpoynor@...gle.com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
drivers/staging/android/Kconfig | 9 -
drivers/staging/android/alarm-dev.c | 446 ---------------------------
drivers/staging/android/android_alarm.h | 41 ---
drivers/staging/android/uapi/android_alarm.h | 62 ----
4 files changed, 558 deletions(-)
delete mode 100644 drivers/staging/android/alarm-dev.c
delete mode 100644 drivers/staging/android/android_alarm.h
delete mode 100644 drivers/staging/android/uapi/android_alarm.h
diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig
index 7e012f3..2ac0b61 100644
--- a/drivers/staging/android/Kconfig
+++ b/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
diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c
deleted file mode 100644
index ff4b3e8..0000000
--- a/drivers/staging/android/alarm-dev.c
+++ /dev/null
@@ -1,446 +0,0 @@
-/* drivers/rtc/alarm-dev.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/fs.h>
-#include <linux/platform_device.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
-#include <linux/alarmtimer.h>
-#include "android_alarm.h"
-
-#define ANDROID_ALARM_PRINT_INFO (1U << 0)
-#define ANDROID_ALARM_PRINT_IO (1U << 1)
-#define ANDROID_ALARM_PRINT_INT (1U << 2)
-
-static int debug_mask = ANDROID_ALARM_PRINT_INFO;
-module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
-
-#define alarm_dbg(debug_level_mask, fmt, ...) \
-do { \
- if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) \
- pr_info(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define ANDROID_ALARM_WAKEUP_MASK ( \
- ANDROID_ALARM_RTC_WAKEUP_MASK | \
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
-
-static int alarm_opened;
-static DEFINE_SPINLOCK(alarm_slock);
-static struct wakeup_source alarm_wake_lock;
-static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
-static uint32_t alarm_pending;
-static uint32_t alarm_enabled;
-static uint32_t wait_pending;
-
-struct devalarm {
- union {
- struct hrtimer hrt;
- struct alarm alrm;
- } u;
- enum android_alarm_type type;
-};
-
-static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT];
-
-/**
- * is_wakeup() - Checks to see if this alarm can wake the device
- * @type: The type of alarm being checked
- *
- * Return: 1 if this is a wakeup alarm, otherwise 0
- */
-static int is_wakeup(enum android_alarm_type type)
-{
- return type == ANDROID_ALARM_RTC_WAKEUP ||
- type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP;
-}
-
-static void devalarm_start(struct devalarm *alrm, ktime_t exp)
-{
- if (is_wakeup(alrm->type))
- alarm_start(&alrm->u.alrm, exp);
- else
- hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS);
-}
-
-static int devalarm_try_to_cancel(struct devalarm *alrm)
-{
- if (is_wakeup(alrm->type))
- return alarm_try_to_cancel(&alrm->u.alrm);
- return hrtimer_try_to_cancel(&alrm->u.hrt);
-}
-
-static void devalarm_cancel(struct devalarm *alrm)
-{
- if (is_wakeup(alrm->type))
- alarm_cancel(&alrm->u.alrm);
- else
- hrtimer_cancel(&alrm->u.hrt);
-}
-
-static void alarm_clear(enum android_alarm_type alarm_type)
-{
- uint32_t alarm_type_mask = 1U << alarm_type;
- unsigned long flags;
-
- spin_lock_irqsave(&alarm_slock, flags);
- alarm_dbg(IO, "alarm %d clear\n", alarm_type);
- devalarm_try_to_cancel(&alarms[alarm_type]);
- if (alarm_pending) {
- alarm_pending &= ~alarm_type_mask;
- if (!alarm_pending && !wait_pending)
- __pm_relax(&alarm_wake_lock);
- }
- alarm_enabled &= ~alarm_type_mask;
- spin_unlock_irqrestore(&alarm_slock, flags);
-}
-
-static void alarm_set(enum android_alarm_type alarm_type,
- struct timespec *ts)
-{
- uint32_t alarm_type_mask = 1U << alarm_type;
- unsigned long flags;
-
- spin_lock_irqsave(&alarm_slock, flags);
- alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
- alarm_type, ts->tv_sec, ts->tv_nsec);
- alarm_enabled |= alarm_type_mask;
- devalarm_start(&alarms[alarm_type], timespec_to_ktime(*ts));
- spin_unlock_irqrestore(&alarm_slock, flags);
-}
-
-static int alarm_wait(void)
-{
- unsigned long flags;
- int rv = 0;
-
- spin_lock_irqsave(&alarm_slock, flags);
- alarm_dbg(IO, "alarm wait\n");
- if (!alarm_pending && wait_pending) {
- __pm_relax(&alarm_wake_lock);
- wait_pending = 0;
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
-
- rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
- if (rv)
- return rv;
-
- spin_lock_irqsave(&alarm_slock, flags);
- rv = alarm_pending;
- wait_pending = 1;
- alarm_pending = 0;
- spin_unlock_irqrestore(&alarm_slock, flags);
-
- return rv;
-}
-
-static int alarm_set_rtc(struct timespec *ts)
-{
- struct rtc_time new_rtc_tm;
- struct rtc_device *rtc_dev;
- unsigned long flags;
- int rv = 0;
-
- rtc_time_to_tm(ts->tv_sec, &new_rtc_tm);
- rtc_dev = alarmtimer_get_rtcdev();
- rv = do_settimeofday(ts);
- if (rv < 0)
- return rv;
- if (rtc_dev)
- rv = rtc_set_time(rtc_dev, &new_rtc_tm);
-
- spin_lock_irqsave(&alarm_slock, flags);
- alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
- wake_up(&alarm_wait_queue);
- spin_unlock_irqrestore(&alarm_slock, flags);
-
- return rv;
-}
-
-static int alarm_get_time(enum android_alarm_type alarm_type,
- struct timespec *ts)
-{
- int rv = 0;
-
- switch (alarm_type) {
- case ANDROID_ALARM_RTC_WAKEUP:
- case ANDROID_ALARM_RTC:
- getnstimeofday(ts);
- break;
- case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
- case ANDROID_ALARM_ELAPSED_REALTIME:
- get_monotonic_boottime(ts);
- break;
- case ANDROID_ALARM_SYSTEMTIME:
- ktime_get_ts(ts);
- break;
- default:
- rv = -EINVAL;
- }
- return rv;
-}
-
-static long alarm_do_ioctl(struct file *file, unsigned int cmd,
- struct timespec *ts)
-{
- int rv = 0;
- unsigned long flags;
- enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
-
- if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
- return -EINVAL;
-
- if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
- if ((file->f_flags & O_ACCMODE) == O_RDONLY)
- return -EPERM;
- if (file->private_data == NULL &&
- cmd != ANDROID_ALARM_SET_RTC) {
- spin_lock_irqsave(&alarm_slock, flags);
- if (alarm_opened) {
- spin_unlock_irqrestore(&alarm_slock, flags);
- return -EBUSY;
- }
- alarm_opened = 1;
- file->private_data = (void *)1;
- spin_unlock_irqrestore(&alarm_slock, flags);
- }
- }
-
- switch (ANDROID_ALARM_BASE_CMD(cmd)) {
- case ANDROID_ALARM_CLEAR(0):
- alarm_clear(alarm_type);
- break;
- case ANDROID_ALARM_SET(0):
- alarm_set(alarm_type, ts);
- break;
- case ANDROID_ALARM_SET_AND_WAIT(0):
- alarm_set(alarm_type, ts);
- /* fall though */
- case ANDROID_ALARM_WAIT:
- rv = alarm_wait();
- break;
- case ANDROID_ALARM_SET_RTC:
- rv = alarm_set_rtc(ts);
- break;
- case ANDROID_ALARM_GET_TIME(0):
- rv = alarm_get_time(alarm_type, ts);
- break;
-
- default:
- rv = -EINVAL;
- }
- return rv;
-}
-
-static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-
- struct timespec ts;
- int rv;
-
- switch (ANDROID_ALARM_BASE_CMD(cmd)) {
- case ANDROID_ALARM_SET_AND_WAIT(0):
- case ANDROID_ALARM_SET(0):
- case ANDROID_ALARM_SET_RTC:
- if (copy_from_user(&ts, (void __user *)arg, sizeof(ts)))
- return -EFAULT;
- break;
- }
-
- rv = alarm_do_ioctl(file, cmd, &ts);
- if (rv)
- return rv;
-
- switch (ANDROID_ALARM_BASE_CMD(cmd)) {
- case ANDROID_ALARM_GET_TIME(0):
- if (copy_to_user((void __user *)arg, &ts, sizeof(ts)))
- return -EFAULT;
- break;
- }
-
- return 0;
-}
-
-#ifdef CONFIG_COMPAT
-static long alarm_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
-
- struct timespec ts;
- int rv;
-
- switch (ANDROID_ALARM_BASE_CMD(cmd)) {
- case ANDROID_ALARM_SET_AND_WAIT_COMPAT(0):
- case ANDROID_ALARM_SET_COMPAT(0):
- case ANDROID_ALARM_SET_RTC_COMPAT:
- if (compat_get_timespec(&ts, (void __user *)arg))
- return -EFAULT;
- /* fall through */
- case ANDROID_ALARM_GET_TIME_COMPAT(0):
- cmd = ANDROID_ALARM_COMPAT_TO_NORM(cmd);
- break;
- }
-
- rv = alarm_do_ioctl(file, cmd, &ts);
- if (rv)
- return rv;
-
- switch (ANDROID_ALARM_BASE_CMD(cmd)) {
- case ANDROID_ALARM_GET_TIME(0): /* NOTE: we modified cmd above */
- if (compat_put_timespec(&ts, (void __user *)arg))
- return -EFAULT;
- break;
- }
-
- return 0;
-}
-#endif
-
-static int alarm_open(struct inode *inode, struct file *file)
-{
- file->private_data = NULL;
- return 0;
-}
-
-static int alarm_release(struct inode *inode, struct file *file)
-{
- int i;
- unsigned long flags;
-
- spin_lock_irqsave(&alarm_slock, flags);
- if (file->private_data) {
- for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
- uint32_t alarm_type_mask = 1U << i;
-
- if (alarm_enabled & alarm_type_mask) {
- alarm_dbg(INFO,
- "%s: clear alarm, pending %d\n",
- __func__,
- !!(alarm_pending & alarm_type_mask));
- alarm_enabled &= ~alarm_type_mask;
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
- devalarm_cancel(&alarms[i]);
- spin_lock_irqsave(&alarm_slock, flags);
- }
- if (alarm_pending | wait_pending) {
- if (alarm_pending)
- alarm_dbg(INFO, "%s: clear pending alarms %x\n",
- __func__, alarm_pending);
- __pm_relax(&alarm_wake_lock);
- wait_pending = 0;
- alarm_pending = 0;
- }
- alarm_opened = 0;
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
- return 0;
-}
-
-static void devalarm_triggered(struct devalarm *alarm)
-{
- unsigned long flags;
- uint32_t alarm_type_mask = 1U << alarm->type;
-
- alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type);
- spin_lock_irqsave(&alarm_slock, flags);
- if (alarm_enabled & alarm_type_mask) {
- __pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
- alarm_enabled &= ~alarm_type_mask;
- alarm_pending |= alarm_type_mask;
- wake_up(&alarm_wait_queue);
- }
- spin_unlock_irqrestore(&alarm_slock, flags);
-}
-
-static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
-{
- struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
-
- devalarm_triggered(devalrm);
- return HRTIMER_NORESTART;
-}
-
-static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
- ktime_t now)
-{
- struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
-
- devalarm_triggered(devalrm);
- return ALARMTIMER_NORESTART;
-}
-
-
-static const struct file_operations alarm_fops = {
- .owner = THIS_MODULE,
- .unlocked_ioctl = alarm_ioctl,
- .open = alarm_open,
- .release = alarm_release,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = alarm_compat_ioctl,
-#endif
-};
-
-static struct miscdevice alarm_device = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "alarm",
- .fops = &alarm_fops,
-};
-
-static int __init alarm_dev_init(void)
-{
- int err;
- int i;
-
- err = misc_register(&alarm_device);
- if (err)
- return err;
-
- alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
- ALARM_REALTIME, devalarm_alarmhandler);
- hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
- CLOCK_REALTIME, HRTIMER_MODE_ABS);
- alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
- ALARM_BOOTTIME, devalarm_alarmhandler);
- hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
- CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
- hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
- CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
-
- for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
- alarms[i].type = i;
- if (!is_wakeup(i))
- alarms[i].u.hrt.function = devalarm_hrthandler;
- }
-
- wakeup_source_init(&alarm_wake_lock, "alarm");
- return 0;
-}
-
-static void __exit alarm_dev_exit(void)
-{
- misc_deregister(&alarm_device);
- wakeup_source_trash(&alarm_wake_lock);
-}
-
-module_init(alarm_dev_init);
-module_exit(alarm_dev_exit);
-MODULE_LICENSE("GPL");
diff --git a/drivers/staging/android/android_alarm.h b/drivers/staging/android/android_alarm.h
deleted file mode 100644
index 495b20c..0000000
--- a/drivers/staging/android/android_alarm.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/* 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
diff --git a/drivers/staging/android/uapi/android_alarm.h b/drivers/staging/android/uapi/android_alarm.h
deleted file mode 100644
index aa013f6..0000000
--- a/drivers/staging/android/uapi/android_alarm.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/* 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
--
1.9.1
--
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