1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index b46927f55038..b2de916107f4 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -940,14 +940,35 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
 	DECLARE_BITMAP(old_stat, MAX_LINE);
 	DECLARE_BITMAP(cur_stat, MAX_LINE);
 	DECLARE_BITMAP(new_stat, MAX_LINE);
+	DECLARE_BITMAP(int_stat, MAX_LINE);
 	DECLARE_BITMAP(trigger, MAX_LINE);
 	DECLARE_BITMAP(edges, MAX_LINE);
 	int ret;
 
+	if (chip->driver_data & PCA_PCAL) {
+		/* Read INT_STAT before it is cleared by the input-port read. */
+		ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, int_stat);
+		if (ret)
+			return false;
+	}
+
 	ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
 	if (ret)
 		return false;
 
+	if (chip->driver_data & PCA_PCAL) {
+		/* Detect short pulses via INT_STAT. */
+		bitmap_and(trigger, int_stat, chip->irq_mask, gc->ngpio);
+
+		/* Apply filter for rising/falling edge selection. */
+		bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise,
+			       cur_stat, gc->ngpio);
+
+		bitmap_and(int_stat, new_stat, trigger, gc->ngpio);
+	} else {
+		bitmap_zero(int_stat, gc->ngpio);
+	}
+
 	/* Remove output pins from the equation */
 	pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 
@@ -961,7 +982,8 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
 
 	if (bitmap_empty(chip->irq_trig_level_high, gc->ngpio) &&
 	    bitmap_empty(chip->irq_trig_level_low, gc->ngpio)) {
-		if (bitmap_empty(trigger, gc->ngpio))
+		if (bitmap_empty(trigger, gc->ngpio) &&
+		    bitmap_empty(int_stat, gc->ngpio))
 			return false;
 	}
 
@@ -969,6 +991,7 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
 	bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
 	bitmap_or(edges, old_stat, cur_stat, gc->ngpio);
 	bitmap_and(pending, edges, trigger, gc->ngpio);
+	bitmap_or(pending, pending, int_stat, gc->ngpio);
 
 	bitmap_and(cur_stat, new_stat, chip->irq_trig_level_high, gc->ngpio);
 	bitmap_and(cur_stat, cur_stat, chip->irq_mask, gc->ngpio);