Messages in this thread Patch in this message | | | From | Guenter Roeck <> | Subject | [PATCH 4/7] rtc: cmos: Report supported alarm limit to rtc infrastructure | Date | Wed, 16 Aug 2023 06:39:33 -0700 |
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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> --- drivers/rtc/rtc-cmos.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index c9416fe8542d..c565dc4d5bf5 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->range_max_offset = SECS_PER_YEAR - 1; + else if (cmos_rtc.day_alrm) + cmos_rtc.rtc->range_max_offset = SECS_PER_MONTH - 1; + else + cmos_rtc.rtc->range_max_offset = SECS_PER_DAY - 1; + rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); if (!mc146818_does_rtc_work()) { -- 2.39.2
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