OMAP_RTC_STATUS_REG
status = rtc_read(rtc, OMAP_RTC_STATUS_REG);
irq_data = rtc_read(rtc, OMAP_RTC_STATUS_REG);
rtc_write(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_ALARM);
rtc_writel(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_ALARM2);
val = rtc_read(rtc, OMAP_RTC_STATUS_REG);
reg = rtc_read(rtc, OMAP_RTC_STATUS_REG);
rtc_write(rtc, OMAP_RTC_STATUS_REG, reg & mask);