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: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 31 insertions, 2 deletions

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index e24ea82dc35b..5d760bb6c2cd 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -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,
 };
 
 /*----------------------------------------------------------------*/