2  * RTC class driver for "CMOS RTC":  PCs, ACPI, etc
14  * The original "cmos clock" chip was an MC146818 chip, now obsolete.
257 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_read_alarm()  local
261 	if (!is_valid_irq(cmos->irq))  in cmos_read_alarm()
274 	if (cmos->day_alrm) {  in cmos_read_alarm()
276 		t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f;  in cmos_read_alarm()
280 		if (cmos->mon_alrm) {  in cmos_read_alarm()
281 			t->time.tm_mon = CMOS_READ(cmos->mon_alrm);  in cmos_read_alarm()
304 		if (cmos->day_alrm) {  in cmos_read_alarm()
310 			if (cmos->mon_alrm) {  in cmos_read_alarm()
325 static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control)  in cmos_checkintr()  argument
339 		rtc_update_irq(cmos->rtc, 1, rtc_intr);  in cmos_checkintr()
342 static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask)  in cmos_irq_enable()  argument
350 	cmos_checkintr(cmos, rtc_control);  in cmos_irq_enable()
358 		if (cmos->wake_on)  in cmos_irq_enable()
359 			cmos->wake_on(cmos->dev);  in cmos_irq_enable()
362 	cmos_checkintr(cmos, rtc_control);  in cmos_irq_enable()
365 static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)  in cmos_irq_disable()  argument
376 		if (cmos->wake_off)  in cmos_irq_disable()
377 			cmos->wake_off(cmos->dev);  in cmos_irq_disable()
380 	cmos_checkintr(cmos, rtc_control);  in cmos_irq_disable()
385 	struct cmos_rtc *cmos = dev_get_drvdata(dev);  in cmos_validate_alarm()  local
390 	if (!cmos->day_alrm) {  in cmos_validate_alarm()
402 	} else if (!cmos->mon_alrm) {  in cmos_validate_alarm()
452 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_set_alarm()  local
457 	if (!is_valid_irq(cmos->irq))  in cmos_set_alarm()
483 	cmos_irq_disable(cmos, RTC_AIE);  in cmos_set_alarm()
491 	if (cmos->day_alrm) {  in cmos_set_alarm()
492 		CMOS_WRITE(mday, cmos->day_alrm);  in cmos_set_alarm()
493 		if (cmos->mon_alrm)  in cmos_set_alarm()
494 			CMOS_WRITE(mon, cmos->mon_alrm);  in cmos_set_alarm()
507 		cmos_irq_enable(cmos, RTC_AIE);  in cmos_set_alarm()
511 	cmos->alarm_expires = rtc_tm_to_time64(&t->time);  in cmos_set_alarm()
518 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_alarm_irq_enable()  local
524 		cmos_irq_enable(cmos, RTC_AIE);  in cmos_alarm_irq_enable()
526 		cmos_irq_disable(cmos, RTC_AIE);  in cmos_alarm_irq_enable()
536 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_procfs()  local
562 		   cmos->rtc->irq_freq,  in cmos_procfs()
621 	struct cmos_rtc	*cmos = priv;  in cmos_nvram_write()  local
634 		if (off == cmos->day_alrm  in cmos_nvram_write()
635 				|| off == cmos->mon_alrm  in cmos_nvram_write()
636 				|| off == cmos->century)  in cmos_nvram_write()
812 		/* force periodic irq to CMOS reset default of 1024Hz;  in cmos_do_probe()
913 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_do_remove()  local
916 	cmos_do_shutdown(cmos->irq);  in cmos_do_remove()
918 	if (is_valid_irq(cmos->irq)) {  in cmos_do_remove()
919 		free_irq(cmos->irq, cmos->rtc);  in cmos_do_remove()
924 	cmos->rtc = NULL;  in cmos_do_remove()
926 	ports = cmos->iomem;  in cmos_do_remove()
931 	cmos->iomem = NULL;  in cmos_do_remove()
933 	cmos->dev = NULL;  in cmos_do_remove()
938 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_aie_poweroff()  local
944 	if (!cmos->alarm_expires)  in cmos_aie_poweroff()
967 	if (cmos->alarm_expires == t_now + 1) {  in cmos_aie_poweroff()
974 	} else if (cmos->alarm_expires > t_now + 1) {  in cmos_aie_poweroff()
983 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_suspend()  local
988 	cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL);  in cmos_suspend()
1000 		cmos_checkintr(cmos, tmp);  in cmos_suspend()
1005 		cmos->enabled_wake = 1;  in cmos_suspend()
1006 		if (cmos->wake_on)  in cmos_suspend()
1007 			cmos->wake_on(dev);  in cmos_suspend()
1009 			enable_irq_wake(cmos->irq);  in cmos_suspend()
1012 	cmos_read_alarm(dev, &cmos->saved_wkalrm);  in cmos_suspend()
1037 	struct cmos_rtc *cmos = dev_get_drvdata(dev);  in cmos_check_wkalrm()  local
1045 	if (!(cmos->suspend_ctrl & RTC_AIE))  in cmos_check_wkalrm()
1055 	if (t_now >= cmos->alarm_expires && cmos_use_acpi_alarm()) {  in cmos_check_wkalrm()
1056 		cmos_interrupt(0, (void *)cmos->rtc);  in cmos_check_wkalrm()
1062 	t_saved_expires = rtc_tm_to_time64(&cmos->saved_wkalrm.time);  in cmos_check_wkalrm()
1064 	    cmos->saved_wkalrm.enabled != current_alarm.enabled) {  in cmos_check_wkalrm()
1065 		cmos_set_alarm(dev, &cmos->saved_wkalrm);  in cmos_check_wkalrm()
1074 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_resume()  local
1077 	if (cmos->enabled_wake && !cmos_use_acpi_alarm()) {  in cmos_resume()
1078 		if (cmos->wake_off)  in cmos_resume()
1079 			cmos->wake_off(dev);  in cmos_resume()
1081 			disable_irq_wake(cmos->irq);  in cmos_resume()
1082 		cmos->enabled_wake = 0;  in cmos_resume()
1089 	tmp = cmos->suspend_ctrl;  in cmos_resume()
1090 	cmos->suspend_ctrl = 0;  in cmos_resume()
1111 			rtc_update_irq(cmos->rtc, 1, mask);  in cmos_resume()
1130 /* On non-x86 systems, a "CMOS" RTC lives most naturally on platform_bus.
1145 	struct cmos_rtc *cmos = dev_get_drvdata(dev);  in rtc_handler()  local
1157 		cmos_interrupt(0, (void *)cmos->rtc);  in rtc_handler()
1167 			rtc_update_irq(cmos->rtc, 1, rtc_intr);  in rtc_handler()
1222 /* Every ACPI platform has a mc146818 compatible "cmos rtc".  Here we find
1264 	struct cmos_rtc *cmos = dev_get_drvdata(dev);  in cmos_check_acpi_rtc_status()  local
1279 		rtc_update_irq(cmos->rtc, 1, mask);  in cmos_check_acpi_rtc_status()
1331 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_pnp_shutdown()  local
1340 	cmos_do_shutdown(cmos->irq);  in cmos_pnp_shutdown()
1429 	struct cmos_rtc	*cmos = dev_get_drvdata(dev);  in cmos_platform_shutdown()  local
1438 	cmos_do_shutdown(cmos->irq);  in cmos_platform_shutdown()
1500 MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");