linux-kernel - [PATCH 6/7] rtc: ds1305: Report maximum alarm limit to rtc core

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Date:   Wed, 16 Aug 2023 06:39:35 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Benson Leung <bleung@...omium.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 6/7] rtc: ds1305: Report maximum alarm limit to rtc core

DS1305 only supports alarms up to 24 hours in the future.
Report the limit to the RTC core.

If the alarm is too large when trying to set an alarm, return -ERANGE
instead of -EDOM to align with error codes returned by other rtc drivers.

Cc: Brian Norris <briannorris@...omium.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/rtc/rtc-ds1305.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-ds1305.c b/drivers/rtc/rtc-ds1305.c
index ed9360486953..1d9bbf4e06cb 100644
--- a/drivers/rtc/rtc-ds1305.c
+++ b/drivers/rtc/rtc-ds1305.c
@@ -337,7 +337,7 @@ static int ds1305_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 	if (later <= now)
 		return -EINVAL;
 	if ((later - now) > 24 * 60 * 60)
-		return -EDOM;
+		return -ERANGE;
 
 	/* disable alarm if needed */
 	if (ds1305->ctrl[0] & DS1305_AEI0) {
@@ -691,6 +691,7 @@ static int ds1305_probe(struct spi_device *spi)
 	ds1305->rtc->ops = &ds1305_ops;
 	ds1305->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	ds1305->rtc->range_max = RTC_TIMESTAMP_END_2099;
+	ds1305->rtc->range_max_offset = 24 * 60 * 60;
 
 	ds1305_nvmem_cfg.priv = ds1305;
 	status = devm_rtc_register_device(ds1305->rtc);
-- 
2.39.2