Commit a0fddaa0 authored by Guenter Roeck's avatar Guenter Roeck Committed by Thomas Gleixner
Browse files

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



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: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230915152238.1144706-2-linux@roeck-us.net
parent 6c774377

include/linux/rtc.h

+17 −0
Original line number Diff line number Diff line
@@ -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)