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, 358 deletions

diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
deleted file mode 100644
index a8f22ee726bb..000000000000
--- a/drivers/rtc/rtc-sysfs.c
+++ /dev/null
@@ -1,358 +0,0 @@
-/*
- * RTC subsystem, sysfs interface
- *
- * Copyright (C) 2005 Tower Technologies
- * Author: Alessandro Zummo <a.zummo@towertech.it>
- *
- * 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.
-*/
-
-#include <linux/module.h>
-#include <linux/rtc.h>
-
-#include "rtc-core.h"
-
-
-/* device attributes */
-
-/*
- * NOTE:  RTC times displayed in sysfs use the RTC's timezone.  That's
- * ideally UTC.  However, PCs that also boot to MS-Windows normally use
- * the local time and change to match daylight savings time.  That affects
- * attributes including date, time, since_epoch, and wakealarm.
- */
-
-static ssize_t
-name_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%s %s\n", dev_driver_string(dev->parent),
-		       dev_name(dev->parent));
-}
-static DEVICE_ATTR_RO(name);
-
-static ssize_t
-date_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	ssize_t retval;
-	struct rtc_time tm;
-
-	retval = rtc_read_time(to_rtc_device(dev), &tm);
-	if (retval)
-		return retval;
-
-	return sprintf(buf, "%ptRd\n", &tm);
-}
-static DEVICE_ATTR_RO(date);
-
-static ssize_t
-time_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	ssize_t retval;
-	struct rtc_time tm;
-
-	retval = rtc_read_time(to_rtc_device(dev), &tm);
-	if (retval)
-		return retval;
-
-	return sprintf(buf, "%ptRt\n", &tm);
-}
-static DEVICE_ATTR_RO(time);
-
-static ssize_t
-since_epoch_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	ssize_t retval;
-	struct rtc_time tm;
-
-	retval = rtc_read_time(to_rtc_device(dev), &tm);
-	if (retval == 0) {
-		time64_t time;
-
-		time = rtc_tm_to_time64(&tm);
-		retval = sprintf(buf, "%lld\n", time);
-	}
-
-	return retval;
-}
-static DEVICE_ATTR_RO(since_epoch);
-
-static ssize_t
-max_user_freq_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%d\n", to_rtc_device(dev)->max_user_freq);
-}
-
-static ssize_t
-max_user_freq_store(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t n)
-{
-	struct rtc_device *rtc = to_rtc_device(dev);
-	unsigned long val;
-	int err;
-
-	err = kstrtoul(buf, 0, &val);
-	if (err)
-		return err;
-
-	if (val >= 4096 || val == 0)
-		return -EINVAL;
-
-	rtc->max_user_freq = (int)val;
-
-	return n;
-}
-static DEVICE_ATTR_RW(max_user_freq);
-
-/**
- * rtc_sysfs_show_hctosys - indicate if the given RTC set the system time
- *
- * Returns 1 if the system clock was set by this RTC at the last
- * boot or resume event.
- */
-static ssize_t
-hctosys_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-#ifdef CONFIG_RTC_HCTOSYS_DEVICE
-	if (rtc_hctosys_ret == 0 &&
-			strcmp(dev_name(&to_rtc_device(dev)->dev),
-				CONFIG_RTC_HCTOSYS_DEVICE) == 0)
-		return sprintf(buf, "1\n");
-	else
-#endif
-		return sprintf(buf, "0\n");
-}
-static DEVICE_ATTR_RO(hctosys);
-
-static ssize_t
-wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	ssize_t retval;
-	time64_t alarm;
-	struct rtc_wkalrm alm;
-
-	/* Don't show disabled alarms.  For uniformity, RTC alarms are
-	 * conceptually one-shot, even though some common RTCs (on PCs)
-	 * don't actually work that way.
-	 *
-	 * NOTE: RTC implementations where the alarm doesn't match an
-	 * exact YYYY-MM-DD HH:MM[:SS] date *must* disable their RTC
-	 * alarms after they trigger, to ensure one-shot semantics.
-	 */
-	retval = rtc_read_alarm(to_rtc_device(dev), &alm);
-	if (retval == 0 && alm.enabled) {
-		alarm = rtc_tm_to_time64(&alm.time);
-		retval = sprintf(buf, "%lld\n", alarm);
-	}
-
-	return retval;
-}
-
-static ssize_t
-wakealarm_store(struct device *dev, struct device_attribute *attr,
-		const char *buf, size_t n)
-{
-	ssize_t retval;
-	time64_t now, alarm;
-	time64_t push = 0;
-	struct rtc_wkalrm alm;
-	struct rtc_device *rtc = to_rtc_device(dev);
-	const char *buf_ptr;
-	int adjust = 0;
-
-	/* Only request alarms that trigger in the future.  Disable them
-	 * by writing another time, e.g. 0 meaning Jan 1 1970 UTC.
-	 */
-	retval = rtc_read_time(rtc, &alm.time);
-	if (retval < 0)
-		return retval;
-	now = rtc_tm_to_time64(&alm.time);
-
-	buf_ptr = buf;
-	if (*buf_ptr == '+') {
-		buf_ptr++;
-		if (*buf_ptr == '=') {
-			buf_ptr++;
-			push = 1;
-		} else
-			adjust = 1;
-	}
-	retval = kstrtos64(buf_ptr, 0, &alarm);
-	if (retval)
-		return retval;
-	if (adjust) {
-		alarm += now;
-	}
-	if (alarm > now || push) {
-		/* Avoid accidentally clobbering active alarms; we can't
-		 * entirely prevent that here, without even the minimal
-		 * locking from the /dev/rtcN api.
-		 */
-		retval = rtc_read_alarm(rtc, &alm);
-		if (retval < 0)
-			return retval;
-		if (alm.enabled) {
-			if (push) {
-				push = rtc_tm_to_time64(&alm.time);
-				alarm += push;
-			} else
-				return -EBUSY;
-		} else if (push)
-			return -EINVAL;
-		alm.enabled = 1;
-	} else {
-		alm.enabled = 0;
-
-		/* Provide a valid future alarm time.  Linux isn't EFI,
-		 * this time won't be ignored when disabling the alarm.
-		 */
-		alarm = now + 300;
-	}
-	rtc_time64_to_tm(alarm, &alm.time);
-
-	retval = rtc_set_alarm(rtc, &alm);
-	return (retval < 0) ? retval : n;
-}
-static DEVICE_ATTR_RW(wakealarm);
-
-static ssize_t
-offset_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	ssize_t retval;
-	long offset;
-
-	retval = rtc_read_offset(to_rtc_device(dev), &offset);
-	if (retval == 0)
-		retval = sprintf(buf, "%ld\n", offset);
-
-	return retval;
-}
-
-static ssize_t
-offset_store(struct device *dev, struct device_attribute *attr,
-	     const char *buf, size_t n)
-{
-	ssize_t retval;
-	long offset;
-
-	retval = kstrtol(buf, 10, &offset);
-	if (retval == 0)
-		retval = rtc_set_offset(to_rtc_device(dev), offset);
-
-	return (retval < 0) ? retval : n;
-}
-static DEVICE_ATTR_RW(offset);
-
-static ssize_t
-range_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "[%lld,%llu]\n", to_rtc_device(dev)->range_min,
-		       to_rtc_device(dev)->range_max);
-}
-static DEVICE_ATTR_RO(range);
-
-static struct attribute *rtc_attrs[] = {
-	&dev_attr_name.attr,
-	&dev_attr_date.attr,
-	&dev_attr_time.attr,
-	&dev_attr_since_epoch.attr,
-	&dev_attr_max_user_freq.attr,
-	&dev_attr_hctosys.attr,
-	&dev_attr_wakealarm.attr,
-	&dev_attr_offset.attr,
-	&dev_attr_range.attr,
-	NULL,
-};
-
-/* The reason to trigger an alarm with no process watching it (via sysfs)
- * is its side effect:  waking from a system state like suspend-to-RAM or
- * suspend-to-disk.  So: no attribute unless that side effect is possible.
- * (Userspace may disable that mechanism later.)
- */
-static bool rtc_does_wakealarm(struct rtc_device *rtc)
-{
-	if (!device_can_wakeup(rtc->dev.parent))
-		return false;
-
-	return rtc->ops->set_alarm != NULL;
-}
-
-static umode_t rtc_attr_is_visible(struct kobject *kobj,
-				   struct attribute *attr, int n)
-{
-	struct device *dev = container_of(kobj, struct device, kobj);
-	struct rtc_device *rtc = to_rtc_device(dev);
-	umode_t mode = attr->mode;
-
-	if (attr == &dev_attr_wakealarm.attr) {
-		if (!rtc_does_wakealarm(rtc))
-			mode = 0;
-	} else if (attr == &dev_attr_offset.attr) {
-		if (!rtc->ops->set_offset)
-			mode = 0;
-	} else if (attr == &dev_attr_range.attr) {
-		if (!(rtc->range_max - rtc->range_min))
-			mode = 0;
-	}
-
-	return mode;
-}
-
-static struct attribute_group rtc_attr_group = {
-	.is_visible	= rtc_attr_is_visible,
-	.attrs		= rtc_attrs,
-};
-
-static const struct attribute_group *rtc_attr_groups[] = {
-	&rtc_attr_group,
-	NULL
-};
-
-const struct attribute_group **rtc_get_dev_attribute_groups(void)
-{
-	return rtc_attr_groups;
-}
-
-int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
-{
-	size_t old_cnt = 0, add_cnt = 0, new_cnt;
-	const struct attribute_group **groups, **old;
-
-	if (rtc->registered)
-		return -EINVAL;
-	if (!grps)
-		return -EINVAL;
-
-	groups = rtc->dev.groups;
-	if (groups)
-		for (; *groups; groups++)
-			old_cnt++;
-
-	for (groups = grps; *groups; groups++)
-		add_cnt++;
-
-	new_cnt = old_cnt + add_cnt + 1;
-	groups = devm_kcalloc(&rtc->dev, new_cnt, sizeof(*groups), GFP_KERNEL);
-	if (!groups)
-		return -ENOMEM;
-	memcpy(groups, rtc->dev.groups, old_cnt * sizeof(*groups));
-	memcpy(groups + old_cnt, grps, add_cnt * sizeof(*groups));
-	groups[old_cnt + add_cnt] = NULL;
-
-	old = rtc->dev.groups;
-	rtc->dev.groups = groups;
-	if (old && old != rtc_attr_groups)
-		devm_kfree(&rtc->dev, old);
-
-	return 0;
-}
-EXPORT_SYMBOL(rtc_add_groups);
-
-int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
-{
-	const struct attribute_group *groups[] = { grp, NULL };
-
-	return rtc_add_groups(rtc, groups);
-}
-EXPORT_SYMBOL(rtc_add_group);