linux-kernel - [PATCH 2/3] rtc: pcf8523: set range

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201118002747.1346504-2-alexandre.belloni@bootlin.com>
Date:   Wed, 18 Nov 2020 01:27:46 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] rtc: pcf8523: set range

Set the th RTC range, it is a classic BCD RTC, considering 00 as a leap
year. Let the core handle range checking.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf8523.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index b525998cd70e..d5f913cb2ec9 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -226,17 +226,6 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	u8 regs[8];
 	int err;
 
-	/*
-	 * The hardware can only store values between 0 and 99 in it's YEAR
-	 * register (with 99 overflowing to 0 on increment).
-	 * After 2100-02-28 we could start interpreting the year to be in the
-	 * interval [2100, 2199], but there is no path to switch in a smooth way
-	 * because the chip handles YEAR=0x00 (and the out-of-spec
-	 * YEAR=0xa0) as a leap year, but 2100 isn't.
-	 */
-	if (tm->tm_year < 100 || tm->tm_year >= 200)
-		return -EINVAL;
-
 	err = pcf8523_stop_rtc(client);
 	if (err < 0)
 		return err;
@@ -361,6 +350,8 @@ static int pcf8523_probe(struct i2c_client *client,
 		return PTR_ERR(rtc);
 
 	rtc->ops = &pcf8523_rtc_ops;
+	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->range_max = RTC_TIMESTAMP_END_2099;
 
 	return devm_rtc_register_device(rtc);
 }
-- 
2.28.0