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authorGuenter Roeck <linux@roeck-us.net>2023-08-18 01:55:34 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2023-08-28 00:50:22 +0300
commit2546e7083f2ea96bdd6157961dc2748d65a9e487 (patch)
treeae2899ec7adf87c6b961e17a0c8b2656adde0d6a /drivers/rtc
parent00c3092d881bc9d63dc36eecd140cdb38962c7ec (diff)
downloadlinux-2546e7083f2ea96bdd6157961dc2748d65a9e487.tar.xz
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: 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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-cmos.c11
1 files changed, 11 insertions, 0 deletions
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()) {