Input: cap11xx - support for irq-active-high option

Some applications need to use the irq-active-high push-pull option.
This allows it be enabled in the device tree child node.

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/cap11xx.txt

@@ -28,6 +28,10 @@ Optional properties:
 				Valid values are 1, 2, 4, and 8.
 				By default, a gain of 1 is set.
 
+	microchip,irq-active-high:	By default the interrupt pin is active low
+				open drain. This property allows using the active
+				high push-pull output.
+
 	linux,keycodes:		Specifies an array of numeric keycode values to
 				be used for the channels. If this property is
 				omitted, KEY_A, KEY_B, etc are used as

drivers/input/keyboard/cap11xx.c

@@ -45,6 +45,7 @@
 #define CAP11XX_REG_STANDBY_SENSITIVITY	0x42
 #define CAP11XX_REG_STANDBY_THRESH	0x43
 #define CAP11XX_REG_CONFIG2		0x44
+#define CAP11XX_REG_CONFIG2_ALT_POL	BIT(6)
 #define CAP11XX_REG_SENSOR_BASE_CNT(X)	(0x50 + (X))
 #define CAP11XX_REG_SENSOR_CALIB	(0xb1 + (X))
 #define CAP11XX_REG_SENSOR_CALIB_LSB1	0xb9
@@ -263,6 +264,13 @@ static int cap11xx_i2c_probe(struct i2c_client *i2c_client,
 			dev_err(dev, "Invalid sensor-gain value %d\n", gain32);
 	}
 
+	if (of_property_read_bool(node, "microchip,irq-active-high")) {
+		error = regmap_update_bits(priv->regmap, CAP11XX_REG_CONFIG2,
+					   CAP11XX_REG_CONFIG2_ALT_POL, 0);
+		if (error)
+			return error;
+	}
+
 	/* Provide some useful defaults */
 	for (i = 0; i < cap->num_channels; i++)
 		priv->keycodes[i] = KEY_A + i;