linux-kernel - [PATCH 2/4] rtc: pcf2123: let the core handle range offsetting

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Message-Id: <20190620183433.30779-2-alexandre.belloni@bootlin.com>
Date:   Thu, 20 Jun 2019 20:34:31 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     linux-rtc@...r.kernel.org
Cc:     Dylan Howey <Dylan.Howey@...nantco.com>,
        linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 2/4] rtc: pcf2123: let the core handle range offsetting

Set the RTC range properly and use the core windowing and offsetting to
(unfortunately) map back to a 1970-2069 range.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf2123.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c
index 29e09ff57f89..d263c8bab62a 100644
--- a/drivers/rtc/rtc-pcf2123.c
+++ b/drivers/rtc/rtc-pcf2123.c
@@ -198,9 +198,7 @@ static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
 	tm->tm_mday = bcd2bin(rxbuf[3] & 0x3F);
 	tm->tm_wday = rxbuf[4] & 0x07;
 	tm->tm_mon = bcd2bin(rxbuf[5] & 0x1F) - 1; /* rtc mn 1-12 */
-	tm->tm_year = bcd2bin(rxbuf[6]);
-	if (tm->tm_year < 70)
-		tm->tm_year += 100;	/* assume we are in 1970...2069 */
+	tm->tm_year = bcd2bin(rxbuf[6]) + 100;
 
 	dev_dbg(dev, "%s: tm is %ptR\n", __func__, tm);
 
@@ -227,7 +225,7 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	txbuf[3] = bin2bcd(tm->tm_mday & 0x3F);
 	txbuf[4] = tm->tm_wday & 0x07;
 	txbuf[5] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
-	txbuf[6] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
+	txbuf[6] = bin2bcd(tm->tm_year - 100);
 
 	ret = regmap_bulk_write(pdata->map, PCF2123_REG_SC, txbuf,
 				sizeof(txbuf));
@@ -435,6 +433,9 @@ static int pcf2123_probe(struct spi_device *spi)
 	 */
 	rtc->uie_unsupported = 1;
 	rtc->ops = &pcf2123_rtc_ops;
+	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->range_max = RTC_TIMESTAMP_END_2099;
+	rtc->set_start_time = true;
 
 	ret = rtc_register_device(rtc);
 	if (ret)
-- 
2.21.0