linux-kernel - [PATCH v2 2/2] cap1106: support for irq-active-high option

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Message-Id: <1411445057-30048-3-git-send-email-mranostay@gmail.com>
Date:	Mon, 22 Sep 2014 21:04:17 -0700
From:	Matt Ranostay <mranostay@...il.com>
To:	galak@...eaurora.org, dmitry.torokhov@...il.com, zonque@...il.com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org
Cc:	devicetree@...r.kernel.org, Matt Ranostay <mranostay@...il.com>
Subject: [PATCH v2 2/2] cap1106: 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@...il.com>
---
 Documentation/devicetree/bindings/input/cap1106.txt | 4 ++++
 drivers/input/keyboard/cap1106.c                    | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/cap1106.txt b/Documentation/devicetree/bindings/input/cap1106.txt
index 4b46390..6f5a143 100644
--- a/Documentation/devicetree/bindings/input/cap1106.txt
+++ b/Documentation/devicetree/bindings/input/cap1106.txt
@@ -26,6 +26,10 @@ 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
diff --git a/drivers/input/keyboard/cap1106.c b/drivers/input/keyboard/cap1106.c
index 07f9e88..d5ce060 100644
--- a/drivers/input/keyboard/cap1106.c
+++ b/drivers/input/keyboard/cap1106.c
@@ -47,6 +47,7 @@
 #define CAP1106_REG_STANDBY_SENSITIVITY	0x42
 #define CAP1106_REG_STANDBY_THRESH	0x43
 #define CAP1106_REG_CONFIG2		0x44
+#define CAP1106_REG_CONFIG2_ALT_POL	BIT(6)
 #define CAP1106_REG_SENSOR_BASE_CNT(X)	(0x50 + (X))
 #define CAP1106_REG_SENSOR_CALIB	(0xb1 + (X))
 #define CAP1106_REG_SENSOR_CALIB_LSB1	0xb9
@@ -260,6 +261,13 @@ static int cap1106_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, CAP1106_REG_CONFIG2,
+					   CAP1106_REG_CONFIG2_ALT_POL, 0);
+		if (error)
+			return error;
+	}
+
 	/* Provide some useful defaults */
 	for (i = 0; i < priv->num_channels; i++)
 		priv->keycodes[i] = KEY_A + i;
-- 
1.9.1

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