From 2546e7083f2ea96bdd6157961dc2748d65a9e487 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 17 Aug 2023 15:55:34 -0700 Subject: 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 Signed-off-by: Guenter Roeck Link: https://lore.kernel.org/r/20230817225537.4053865-5-linux@roeck-us.net Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-cmos.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index c9416fe8542d..228fb2d11c70 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -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()) { -- cgit v1.2.3