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Commit 57deb526 authored by Alessandro Zummo's avatar Alessandro Zummo Committed by Linus Torvalds
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RTC: add periodic irq support to rtc-cmos 



Adds support for periodic irq enabling in rtc-cmos.  This could be used by
the ALSA driver and is already being tested with the zaptel ztdummy module.

Signed-off-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c7d51402

drivers/rtc/rtc-cmos.c

+31 −2
Original line number Diff line number Diff line
@@ -235,7 +235,7 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) 
	return 0;

}



static int cmos_set_freq(struct device *dev, int freq)

static int cmos_irq_set_freq(struct device *dev, int freq)

{

	struct cmos_rtc	*cmos = dev_get_drvdata(dev);

	int		f;
@@ -259,6 +259,34 @@ static int cmos_set_freq(struct device *dev, int freq) 
	return 0;

}



static int cmos_irq_set_state(struct device *dev, int enabled)

{

	struct cmos_rtc	*cmos = dev_get_drvdata(dev);

	unsigned char	rtc_control, rtc_intr;

	unsigned long	flags;



	if (!is_valid_irq(cmos->irq))

		return -ENXIO;



	spin_lock_irqsave(&rtc_lock, flags);

	rtc_control = CMOS_READ(RTC_CONTROL);



	if (enabled)

		rtc_control |= RTC_PIE;

	else

		rtc_control &= ~RTC_PIE;



	CMOS_WRITE(rtc_control, RTC_CONTROL);



	rtc_intr = CMOS_READ(RTC_INTR_FLAGS);

	rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;

	if (is_intr(rtc_intr))

		rtc_update_irq(cmos->rtc, 1, rtc_intr);



	spin_unlock_irqrestore(&rtc_lock, flags);

	return 0;

}



#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)



static int
@@ -360,7 +388,8 @@ static const struct rtc_class_ops cmos_rtc_ops = { 
	.read_alarm	= cmos_read_alarm,

	.set_alarm	= cmos_set_alarm,

	.proc		= cmos_procfs,

	.irq_set_freq	= cmos_set_freq,

	.irq_set_freq	= cmos_irq_set_freq,

	.irq_set_state	= cmos_irq_set_state,

};



/*----------------------------------------------------------------*/