mfd/mc13783: new function reading irq mask and status register

The driver for the mc13783 rtc needs to know if the TODA irq is pending.

Instead of tracking in the rtc driver if the irq is enabled provide that
information, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Cc: Valentin Longchamp <valentin.longchamp@epfl.ch>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Luotao Fu <l.fu@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/mfd/mc13783-core.c b/drivers/mfd/mc13783-core.c
index a2bd44552042..62a847e4c2d8 100644
--- a/drivers/mfd/mc13783-core.c
+++ b/drivers/mfd/mc13783-core.c
@@ -269,6 +269,41 @@ int mc13783_irq_unmask(struct mc13783 *mc13783, int irq)
 }
 EXPORT_SYMBOL(mc13783_irq_unmask);
 
+int mc13783_irq_status(struct mc13783 *mc13783, int irq,
+                int *enabled, int *pending)
+{
+        int ret;
+        unsigned int offmask = irq < 24 ? MC13783_IRQMASK0 : MC13783_IRQMASK1;
+        unsigned int offstat = irq < 24 ? MC13783_IRQSTAT0 : MC13783_IRQSTAT1;
+        u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
+
+        if (irq < 0 || irq >= MC13783_NUM_IRQ)
+                return -EINVAL;
+
+        if (enabled) {
+                u32 mask;
+
+                ret = mc13783_reg_read(mc13783, offmask, &mask);
+                if (ret)
+                        return ret;
+
+                *enabled = mask & irqbit;
+        }
+
+        if (pending) {
+                u32 stat;
+
+                ret = mc13783_reg_read(mc13783, offstat, &stat);
+                if (ret)
+                        return ret;
+
+                *pending = stat & irqbit;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL(mc13783_irq_status);
+
 int mc13783_irq_ack(struct mc13783 *mc13783, int irq)
 {
         unsigned int offstat = irq < 24 ? MC13783_IRQSTAT0 : MC13783_IRQSTAT1;