rtc: rename core files

Rename core files so there is a clearer separation between the RTC core and
the RTC drivers.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

1 files changed, 0 insertions, 483 deletions

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
deleted file mode 100644
index 43d962a9c210..000000000000
--- a/drivers/rtc/rtc-dev.c
+++ /dev/null
@@ -1,483 +0,0 @@
-/*
- * RTC subsystem, dev interface
- *
- * Copyright (C) 2005 Tower Technologies
- * Author: Alessandro Zummo <a.zummo@towertech.it>
- *
- * based on arch/arm/common/rtctime.c
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/rtc.h>
-#include <linux/sched/signal.h>
-#include "rtc-core.h"
-
-static dev_t rtc_devt;
-
-#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */
-
-static int rtc_dev_open(struct inode *inode, struct file *file)
-{
-	struct rtc_device *rtc = container_of(inode->i_cdev,
-					struct rtc_device, char_dev);
-
-	if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
-		return -EBUSY;
-
-	file->private_data = rtc;
-
-	spin_lock_irq(&rtc->irq_lock);
-	rtc->irq_data = 0;
-	spin_unlock_irq(&rtc->irq_lock);
-
-	return 0;
-}
-
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-/*
- * Routine to poll RTC seconds field for change as often as possible,
- * after first RTC_UIE use timer to reduce polling
- */
-static void rtc_uie_task(struct work_struct *work)
-{
-	struct rtc_device *rtc =
-		container_of(work, struct rtc_device, uie_task);
-	struct rtc_time tm;
-	int num = 0;
-	int err;
-
-	err = rtc_read_time(rtc, &tm);
-
-	spin_lock_irq(&rtc->irq_lock);
-	if (rtc->stop_uie_polling || err) {
-		rtc->uie_task_active = 0;
-	} else if (rtc->oldsecs != tm.tm_sec) {
-		num = (tm.tm_sec + 60 - rtc->oldsecs) % 60;
-		rtc->oldsecs = tm.tm_sec;
-		rtc->uie_timer.expires = jiffies + HZ - (HZ/10);
-		rtc->uie_timer_active = 1;
-		rtc->uie_task_active = 0;
-		add_timer(&rtc->uie_timer);
-	} else if (schedule_work(&rtc->uie_task) == 0) {
-		rtc->uie_task_active = 0;
-	}
-	spin_unlock_irq(&rtc->irq_lock);
-	if (num)
-		rtc_handle_legacy_irq(rtc, num, RTC_UF);
-}
-static void rtc_uie_timer(struct timer_list *t)
-{
-	struct rtc_device *rtc = from_timer(rtc, t, uie_timer);
-	unsigned long flags;
-
-	spin_lock_irqsave(&rtc->irq_lock, flags);
-	rtc->uie_timer_active = 0;
-	rtc->uie_task_active = 1;
-	if ((schedule_work(&rtc->uie_task) == 0))
-		rtc->uie_task_active = 0;
-	spin_unlock_irqrestore(&rtc->irq_lock, flags);
-}
-
-static int clear_uie(struct rtc_device *rtc)
-{
-	spin_lock_irq(&rtc->irq_lock);
-	if (rtc->uie_irq_active) {
-		rtc->stop_uie_polling = 1;
-		if (rtc->uie_timer_active) {
-			spin_unlock_irq(&rtc->irq_lock);
-			del_timer_sync(&rtc->uie_timer);
-			spin_lock_irq(&rtc->irq_lock);
-			rtc->uie_timer_active = 0;
-		}
-		if (rtc->uie_task_active) {
-			spin_unlock_irq(&rtc->irq_lock);
-			flush_scheduled_work();
-			spin_lock_irq(&rtc->irq_lock);
-		}
-		rtc->uie_irq_active = 0;
-	}
-	spin_unlock_irq(&rtc->irq_lock);
-	return 0;
-}
-
-static int set_uie(struct rtc_device *rtc)
-{
-	struct rtc_time tm;
-	int err;
-
-	err = rtc_read_time(rtc, &tm);
-	if (err)
-		return err;
-	spin_lock_irq(&rtc->irq_lock);
-	if (!rtc->uie_irq_active) {
-		rtc->uie_irq_active = 1;
-		rtc->stop_uie_polling = 0;
-		rtc->oldsecs = tm.tm_sec;
-		rtc->uie_task_active = 1;
-		if (schedule_work(&rtc->uie_task) == 0)
-			rtc->uie_task_active = 0;
-	}
-	rtc->irq_data = 0;
-	spin_unlock_irq(&rtc->irq_lock);
-	return 0;
-}
-
-int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled)
-{
-	if (enabled)
-		return set_uie(rtc);
-	else
-		return clear_uie(rtc);
-}
-EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul);
-
-#endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */
-
-static ssize_t
-rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
-{
-	struct rtc_device *rtc = file->private_data;
-
-	DECLARE_WAITQUEUE(wait, current);
-	unsigned long data;
-	ssize_t ret;
-
-	if (count != sizeof(unsigned int) && count < sizeof(unsigned long))
-		return -EINVAL;
-
-	add_wait_queue(&rtc->irq_queue, &wait);
-	do {
-		__set_current_state(TASK_INTERRUPTIBLE);
-
-		spin_lock_irq(&rtc->irq_lock);
-		data = rtc->irq_data;
-		rtc->irq_data = 0;
-		spin_unlock_irq(&rtc->irq_lock);
-
-		if (data != 0) {
-			ret = 0;
-			break;
-		}
-		if (file->f_flags & O_NONBLOCK) {
-			ret = -EAGAIN;
-			break;
-		}
-		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
-			break;
-		}
-		schedule();
-	} while (1);
-	set_current_state(TASK_RUNNING);
-	remove_wait_queue(&rtc->irq_queue, &wait);
-
-	if (ret == 0) {
-		/* Check for any data updates */
-		if (rtc->ops->read_callback)
-			data = rtc->ops->read_callback(rtc->dev.parent,
-						       data);
-
-		if (sizeof(int) != sizeof(long) &&
-		    count == sizeof(unsigned int))
-			ret = put_user(data, (unsigned int __user *)buf) ?:
-				sizeof(unsigned int);
-		else
-			ret = put_user(data, (unsigned long __user *)buf) ?:
-				sizeof(unsigned long);
-	}
-	return ret;
-}
-
-static __poll_t rtc_dev_poll(struct file *file, poll_table *wait)
-{
-	struct rtc_device *rtc = file->private_data;
-	unsigned long data;
-
-	poll_wait(file, &rtc->irq_queue, wait);
-
-	data = rtc->irq_data;
-
-	return (data != 0) ? (EPOLLIN | EPOLLRDNORM) : 0;
-}
-
-static long rtc_dev_ioctl(struct file *file,
-		unsigned int cmd, unsigned long arg)
-{
-	int err = 0;
-	struct rtc_device *rtc = file->private_data;
-	const struct rtc_class_ops *ops = rtc->ops;
-	struct rtc_time tm;
-	struct rtc_wkalrm alarm;
-	void __user *uarg = (void __user *) arg;
-
-	err = mutex_lock_interruptible(&rtc->ops_lock);
-	if (err)
-		return err;
-
-	/* check that the calling task has appropriate permissions
-	 * for certain ioctls. doing this check here is useful
-	 * to avoid duplicate code in each driver.
-	 */
-	switch (cmd) {
-	case RTC_EPOCH_SET:
-	case RTC_SET_TIME:
-		if (!capable(CAP_SYS_TIME))
-			err = -EACCES;
-		break;
-
-	case RTC_IRQP_SET:
-		if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
-			err = -EACCES;
-		break;
-
-	case RTC_PIE_ON:
-		if (rtc->irq_freq > rtc->max_user_freq &&
-				!capable(CAP_SYS_RESOURCE))
-			err = -EACCES;
-		break;
-	}
-
-	if (err)
-		goto done;
-
-	/*
-	 * Drivers *SHOULD NOT* provide ioctl implementations
-	 * for these requests.  Instead, provide methods to
-	 * support the following code, so that the RTC's main
-	 * features are accessible without using ioctls.
-	 *
-	 * RTC and alarm times will be in UTC, by preference,
-	 * but dual-booting with MS-Windows implies RTCs must
-	 * use the local wall clock time.
-	 */
-
-	switch (cmd) {
-	case RTC_ALM_READ:
-		mutex_unlock(&rtc->ops_lock);
-
-		err = rtc_read_alarm(rtc, &alarm);
-		if (err < 0)
-			return err;
-
-		if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
-			err = -EFAULT;
-		return err;
-
-	case RTC_ALM_SET:
-		mutex_unlock(&rtc->ops_lock);
-
-		if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
-			return -EFAULT;
-
-		alarm.enabled = 0;
-		alarm.pending = 0;
-		alarm.time.tm_wday = -1;
-		alarm.time.tm_yday = -1;
-		alarm.time.tm_isdst = -1;
-
-		/* RTC_ALM_SET alarms may be up to 24 hours in the future.
-		 * Rather than expecting every RTC to implement "don't care"
-		 * for day/month/year fields, just force the alarm to have
-		 * the right values for those fields.
-		 *
-		 * RTC_WKALM_SET should be used instead.  Not only does it
-		 * eliminate the need for a separate RTC_AIE_ON call, it
-		 * doesn't have the "alarm 23:59:59 in the future" race.
-		 *
-		 * NOTE:  some legacy code may have used invalid fields as
-		 * wildcards, exposing hardware "periodic alarm" capabilities.
-		 * Not supported here.
-		 */
-		{
-			time64_t now, then;
-
-			err = rtc_read_time(rtc, &tm);
-			if (err < 0)
-				return err;
-			now = rtc_tm_to_time64(&tm);
-
-			alarm.time.tm_mday = tm.tm_mday;
-			alarm.time.tm_mon = tm.tm_mon;
-			alarm.time.tm_year = tm.tm_year;
-			err  = rtc_valid_tm(&alarm.time);
-			if (err < 0)
-				return err;
-			then = rtc_tm_to_time64(&alarm.time);
-
-			/* alarm may need to wrap into tomorrow */
-			if (then < now) {
-				rtc_time64_to_tm(now + 24 * 60 * 60, &tm);
-				alarm.time.tm_mday = tm.tm_mday;
-				alarm.time.tm_mon = tm.tm_mon;
-				alarm.time.tm_year = tm.tm_year;
-			}
-		}
-
-		return rtc_set_alarm(rtc, &alarm);
-
-	case RTC_RD_TIME:
-		mutex_unlock(&rtc->ops_lock);
-
-		err = rtc_read_time(rtc, &tm);
-		if (err < 0)
-			return err;
-
-		if (copy_to_user(uarg, &tm, sizeof(tm)))
-			err = -EFAULT;
-		return err;
-
-	case RTC_SET_TIME:
-		mutex_unlock(&rtc->ops_lock);
-
-		if (copy_from_user(&tm, uarg, sizeof(tm)))
-			return -EFAULT;
-
-		return rtc_set_time(rtc, &tm);
-
-	case RTC_PIE_ON:
-		err = rtc_irq_set_state(rtc, 1);
-		break;
-
-	case RTC_PIE_OFF:
-		err = rtc_irq_set_state(rtc, 0);
-		break;
-
-	case RTC_AIE_ON:
-		mutex_unlock(&rtc->ops_lock);
-		return rtc_alarm_irq_enable(rtc, 1);
-
-	case RTC_AIE_OFF:
-		mutex_unlock(&rtc->ops_lock);
-		return rtc_alarm_irq_enable(rtc, 0);
-
-	case RTC_UIE_ON:
-		mutex_unlock(&rtc->ops_lock);
-		return rtc_update_irq_enable(rtc, 1);
-
-	case RTC_UIE_OFF:
-		mutex_unlock(&rtc->ops_lock);
-		return rtc_update_irq_enable(rtc, 0);
-
-	case RTC_IRQP_SET:
-		err = rtc_irq_set_freq(rtc, arg);
-		break;
-
-	case RTC_IRQP_READ:
-		err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
-		break;
-
-	case RTC_WKALM_SET:
-		mutex_unlock(&rtc->ops_lock);
-		if (copy_from_user(&alarm, uarg, sizeof(alarm)))
-			return -EFAULT;
-
-		return rtc_set_alarm(rtc, &alarm);
-
-	case RTC_WKALM_RD:
-		mutex_unlock(&rtc->ops_lock);
-		err = rtc_read_alarm(rtc, &alarm);
-		if (err < 0)
-			return err;
-
-		if (copy_to_user(uarg, &alarm, sizeof(alarm)))
-			err = -EFAULT;
-		return err;
-
-	default:
-		/* Finally try the driver's ioctl interface */
-		if (ops->ioctl) {
-			err = ops->ioctl(rtc->dev.parent, cmd, arg);
-			if (err == -ENOIOCTLCMD)
-				err = -ENOTTY;
-		} else
-			err = -ENOTTY;
-		break;
-	}
-
-done:
-	mutex_unlock(&rtc->ops_lock);
-	return err;
-}
-
-static int rtc_dev_fasync(int fd, struct file *file, int on)
-{
-	struct rtc_device *rtc = file->private_data;
-	return fasync_helper(fd, file, on, &rtc->async_queue);
-}
-
-static int rtc_dev_release(struct inode *inode, struct file *file)
-{
-	struct rtc_device *rtc = file->private_data;
-
-	/* We shut down the repeating IRQs that userspace enabled,
-	 * since nothing is listening to them.
-	 *  - Update (UIE) ... currently only managed through ioctls
-	 *  - Periodic (PIE) ... also used through rtc_*() interface calls
-	 *
-	 * Leave the alarm alone; it may be set to trigger a system wakeup
-	 * later, or be used by kernel code, and is a one-shot event anyway.
-	 */
-
-	/* Keep ioctl until all drivers are converted */
-	rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
-	rtc_update_irq_enable(rtc, 0);
-	rtc_irq_set_state(rtc, 0);
-
-	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
-	return 0;
-}
-
-static const struct file_operations rtc_dev_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.read		= rtc_dev_read,
-	.poll		= rtc_dev_poll,
-	.unlocked_ioctl	= rtc_dev_ioctl,
-	.open		= rtc_dev_open,
-	.release	= rtc_dev_release,
-	.fasync		= rtc_dev_fasync,
-};
-
-/* insertion/removal hooks */
-
-void rtc_dev_prepare(struct rtc_device *rtc)
-{
-	if (!rtc_devt)
-		return;
-
-	if (rtc->id >= RTC_DEV_MAX) {
-		dev_dbg(&rtc->dev, "too many RTC devices\n");
-		return;
-	}
-
-	rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
-
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-	INIT_WORK(&rtc->uie_task, rtc_uie_task);
-	timer_setup(&rtc->uie_timer, rtc_uie_timer, 0);
-#endif
-
-	cdev_init(&rtc->char_dev, &rtc_dev_fops);
-	rtc->char_dev.owner = rtc->owner;
-}
-
-void __init rtc_dev_init(void)
-{
-	int err;
-
-	err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
-	if (err < 0)
-		pr_err("failed to allocate char dev region\n");
-}
-
-void __exit rtc_dev_exit(void)
-{
-	if (rtc_devt)
-		unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
-}