add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-vr41xx.c
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@@ -1,22 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *  Driver for NEC VR4100 series Real Time Clock unit.
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  *
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  *  Copyright (C) 2003-2008  Yoichi Yuasa <yuasa@linux-mips.org>
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  */
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+#include <linux/compat.h>
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 #include <linux/err.h>
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 #include <linux/fs.h>
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 #include <linux/init.h>
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@@ -79,6 +67,9 @@
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 #define rtc2_read(offset)		readw(rtc2_base + (offset))
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 #define rtc2_write(offset, value)	writew((value), rtc2_base + (offset))
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+/* 32-bit compat for ioctls that nobody else uses */
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+#define RTC_EPOCH_READ32	_IOR('p', 0x0d, __u32)
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+
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 static unsigned long epoch = 1970;	/* Jan 1 1970 00:00:00 */
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 static DEFINE_SPINLOCK(rtc_lock);
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@@ -136,8 +127,7 @@
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 	time64_t epoch_sec, current_sec;
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 	epoch_sec = mktime64(epoch, 1, 1, 0, 0, 0);
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-	current_sec = mktime64(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
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-			     time->tm_hour, time->tm_min, time->tm_sec);
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+	current_sec = rtc_tm_to_time64(time);
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 	write_elapsed_second(current_sec - epoch_sec);
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@@ -158,7 +148,7 @@
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 	spin_unlock_irq(&rtc_lock);
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-	rtc_time_to_tm((high << 17) | (mid << 1) | (low >> 15), time);
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+	rtc_time64_to_tm((high << 17) | (mid << 1) | (low >> 15), time);
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 	return 0;
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 }
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@@ -166,10 +156,8 @@
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 static int vr41xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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 {
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 	time64_t alarm_sec;
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-	struct rtc_time *time = &wkalrm->time;
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-	alarm_sec = mktime64(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
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-			     time->tm_hour, time->tm_min, time->tm_sec);
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+	alarm_sec = rtc_tm_to_time64(&wkalrm->time);
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 	spin_lock_irq(&rtc_lock);
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@@ -195,6 +183,10 @@
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 	switch (cmd) {
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 	case RTC_EPOCH_READ:
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 		return put_user(epoch, (unsigned long __user *)arg);
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+#ifdef CONFIG_64BIT
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+	case RTC_EPOCH_READ32:
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+		return put_user(epoch, (unsigned int __user *)arg);
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+#endif
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 	case RTC_EPOCH_SET:
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 		/* Doesn't support before 1900 */
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 		if (arg < 1900)