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rtc: Add API function to return alarm time bound by hardware limit

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Add rtc_bound_alarmtime() to return the requested alarm timeout bound by
the maxmum alarm timeout that is supported by a given RTC.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230915152238.1144706-2-linux@roeck-us.net
This commit is contained in:
Guenter Roeck
2023-09-15 08:22:37 -07:00
committed by Thomas Gleixner
parent 6c77437735
commit a0fddaa0b5
1 changed files with 17 additions and 0 deletions
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include/linux/rtc.h
+17
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@@ -225,6 +225,23 @@ static inline bool is_leap_year(unsigned int year)
return (!(year % 4) && (year % 100)) || !(year % 400);
}
/**
* rtc_bound_alarmtime() - Return alarm time bound by rtc limit
* @rtc: Pointer to rtc device structure
* @requested: Requested alarm timeout
*
* Return: Alarm timeout bound by maximum alarm time supported by rtc.
*/
static inline ktime_t rtc_bound_alarmtime(struct rtc_device *rtc,
ktime_t requested)
{
if (rtc->alarm_offset_max &&
rtc->alarm_offset_max * MSEC_PER_SEC < ktime_to_ms(requested))
return ms_to_ktime(rtc->alarm_offset_max * MSEC_PER_SEC);
return requested;
}
#define devm_rtc_register_device(device) \
__devm_rtc_register_device(THIS_MODULE, device)