Input: axp20x-pek - fix reporting button state as inverted

Currently we are reporting the button state as inverted on all boards with
an axp209 pmic, tested on a ba10-tvbox, bananapi, bananapro, cubietruck and
utoo-p66 tablet.

The axp209 datasheet clearly states that the power button must be connected
between the PWRON key and ground. Which means that on a press we will get
a falling edge (dbf) irq not a rising one, and likewise on release we will
get a rising edge (dbr) irq, not a falling one.

This commit swaps the check for the 2 irqs fixing the inverted reporting of
the power button state.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Carlo Caione <carlo@caione.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/axp20x-pek.c

@@ -167,9 +167,13 @@ static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 	struct input_dev *idev = pwr;
 	struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
 
-	if (irq == axp20x_pek->irq_dbr)
+	/*
+	 * The power-button is connected to ground so a falling edge (dbf)
+	 * means it is pressed.
+	 */
+	if (irq == axp20x_pek->irq_dbf)
 		input_report_key(idev, KEY_POWER, true);
-	else if (irq == axp20x_pek->irq_dbf)
+	else if (irq == axp20x_pek->irq_dbr)
 		input_report_key(idev, KEY_POWER, false);
 
 	input_sync(idev);