add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-r9701.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Driver for Epson RTC-9701JE
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  *
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@@ -7,10 +8,6 @@
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  *
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  * Copyright (C) 2006 8D Technologies inc.
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  * Copyright (C) 2004 Compulab Ltd.
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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 version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/module.h>
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@@ -78,8 +75,6 @@
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 	if (ret)
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 		return ret;
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-	memset(dt, 0, sizeof(*dt));
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-
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 	dt->tm_sec = bcd2bin(buf[0]); /* RSECCNT */
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 	dt->tm_min = bcd2bin(buf[1]); /* RMINCNT */
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 	dt->tm_hour = bcd2bin(buf[2]); /* RHRCNT */
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@@ -88,20 +83,12 @@
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 	dt->tm_mon = bcd2bin(buf[4]) - 1; /* RMONCNT */
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 	dt->tm_year = bcd2bin(buf[5]) + 100; /* RYRCNT */
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-	/* the rtc device may contain illegal values on power up
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-	 * according to the data sheet. make sure they are valid.
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-	 */
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-
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 	return 0;
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 }
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 static int r9701_set_datetime(struct device *dev, struct rtc_time *dt)
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 {
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-	int ret, year;
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-
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-	year = dt->tm_year + 1900;
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-	if (year >= 2100 || year < 2000)
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-		return -EINVAL;
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+	int ret;
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 	ret = write_reg(dev, RHRCNT, bin2bcd(dt->tm_hour));
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 	ret = ret ? ret : write_reg(dev, RMINCNT, bin2bcd(dt->tm_min));
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@@ -109,7 +96,6 @@
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 	ret = ret ? ret : write_reg(dev, RDAYCNT, bin2bcd(dt->tm_mday));
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 	ret = ret ? ret : write_reg(dev, RMONCNT, bin2bcd(dt->tm_mon + 1));
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 	ret = ret ? ret : write_reg(dev, RYRCNT, bin2bcd(dt->tm_year - 100));
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-	ret = ret ? ret : write_reg(dev, RWKCNT, 1 << dt->tm_wday);
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 	return ret;
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 }
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@@ -122,7 +108,6 @@
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 static int r9701_probe(struct spi_device *spi)
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 {
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 	struct rtc_device *rtc;
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-	struct rtc_time dt;
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 	unsigned char tmp;
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 	int res;
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@@ -133,35 +118,16 @@
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 		return -ENODEV;
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 	}
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-	/*
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-	 * The device seems to be present. Now check if the registers
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-	 * contain invalid values. If so, try to write a default date:
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-	 * 2000/1/1 00:00:00
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-	 */
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-	if (r9701_get_datetime(&spi->dev, &dt)) {
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-		dev_info(&spi->dev, "trying to repair invalid date/time\n");
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-		dt.tm_sec  = 0;
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-		dt.tm_min  = 0;
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-		dt.tm_hour = 0;
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-		dt.tm_mday = 1;
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-		dt.tm_mon  = 0;
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-		dt.tm_year = 100;
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-
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-		if (r9701_set_datetime(&spi->dev, &dt) ||
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-				r9701_get_datetime(&spi->dev, &dt)) {
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-			dev_err(&spi->dev, "cannot repair RTC register\n");
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-			return -ENODEV;
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-		}
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-	}
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-
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-	rtc = devm_rtc_device_register(&spi->dev, "r9701",
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-				&r9701_rtc_ops, THIS_MODULE);
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+	rtc = devm_rtc_allocate_device(&spi->dev);
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 	if (IS_ERR(rtc))
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 		return PTR_ERR(rtc);
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 	spi_set_drvdata(spi, rtc);
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+	rtc->ops = &r9701_rtc_ops;
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+	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	rtc->range_max = RTC_TIMESTAMP_END_2099;
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-	return 0;
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+	return rtc_register_device(rtc);
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 }
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 static struct spi_driver r9701_driver = {