rtc_handle_legacy_irq
rtc_handle_legacy_irq(rtc, num, RTC_UF);
rtc_handle_legacy_irq(rtc, 1, RTC_AF);
rtc_handle_legacy_irq(rtc, 1, RTC_UF);
rtc_handle_legacy_irq(rtc, count, RTC_PF);
void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);