Commit 2546e708 authored by Guenter Roeck's avatar Guenter Roeck Committed by Alexandre Belloni
Browse files

rtc: cmos: Report supported alarm limit to rtc infrastructure 



The alarm window supported by the cmos RTC depends on the chip
and its configuration. Report the limit to the RTC core.

Cc: Brian Norris <briannorris@chromium.org>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230817225537.4053865-5-linux@roeck-us.net


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 00c3092d

drivers/rtc/rtc-cmos.c

+11 −0
Original line number Diff line number Diff line
@@ -913,6 +913,10 @@ static inline void cmos_check_acpi_rtc_status(struct device *dev, 
#define	INITSECTION	__init

#endif



#define SECS_PER_DAY	(24 * 60 * 60)

#define SECS_PER_MONTH	(28 * SECS_PER_DAY)

#define SECS_PER_YEAR	(365 * SECS_PER_DAY)



static int INITSECTION

cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)

{
@@ -1019,6 +1023,13 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) 
		goto cleanup0;

	}



	if (cmos_rtc.mon_alrm)

		cmos_rtc.rtc->alarm_offset_max = SECS_PER_YEAR - 1;

	else if (cmos_rtc.day_alrm)

		cmos_rtc.rtc->alarm_offset_max = SECS_PER_MONTH - 1;

	else

		cmos_rtc.rtc->alarm_offset_max = SECS_PER_DAY - 1;



	rename_region(ports, dev_name(&cmos_rtc.rtc->dev));



	if (!mc146818_does_rtc_work()) {