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rtc: cmos: Report supported alarm limit to rtc infrastructure

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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: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230817225537.4053865-5-linux@roeck-us.net
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Guenter Roeck 2023-08-17 15:55:34 -07:00 committed by Alexandre Belloni
parent 00c3092d88
commit 2546e7083f
1 changed files with 11 additions and 0 deletions
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11
drivers/rtc/rtc-cmos.c
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@ -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()) {