linux-kernel - [PATCH v2 2/6] input/touchscreen: Add device tree support to wacom

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Message-Id: <20210121065643.342-3-alistair@alistair23.me>
Date:   Wed, 20 Jan 2021 22:56:39 -0800
From:   Alistair Francis <alistair@...stair23.me>
To:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-imx@....com, kernel@...gutronix.de
Cc:     linux-kernel@...r.kernel.org, alistair23@...il.com,
        Alistair Francis <alistair@...stair23.me>
Subject: [PATCH v2 2/6] input/touchscreen: Add device tree support to wacom_i2c

Allow the wacom-i2c device to be exposed via device tree.

Signed-off-by: Alistair Francis <alistair@...stair23.me>
---
 .../input/touchscreen/wacom,wacom-i2c.yaml       |  4 ++++
 drivers/input/touchscreen/wacom_i2c.c            | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
index b36d22cd20a2..06ad5ee561af 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
@@ -22,6 +22,9 @@ properties:
   interrupts:
     maxItems: 1
 
+  vdd-supply:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -40,5 +43,6 @@ examples:
                 reg = <0x9>;
                 interrupt-parent = <&gpio1>;
                 interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+                vdd-supply = <&reg_touch>;
         };
     };
diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index 1afc6bde2891..ec6e0aff8deb 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -11,7 +11,9 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
+#include <linux/input/touchscreen.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <asm/unaligned.h>
 
 #define WACOM_CMD_QUERY0	0x04
@@ -32,6 +34,7 @@ struct wacom_features {
 struct wacom_i2c {
 	struct i2c_client *client;
 	struct input_dev *input;
+	struct touchscreen_properties props;
 	u8 data[WACOM_QUERY_SIZE];
 	bool prox;
 	int tool;
@@ -187,6 +190,7 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	__set_bit(BTN_STYLUS2, input->keybit);
 	__set_bit(BTN_TOUCH, input->keybit);
 
+	touchscreen_parse_properties(input, true, &wac_i2c->props);
 	input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0);
 	input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
 	input_set_abs_params(input, ABS_PRESSURE,
@@ -214,6 +218,7 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	}
 
 	i2c_set_clientdata(client, wac_i2c);
+
 	return 0;
 
 err_free_irq:
@@ -262,10 +267,21 @@ static const struct i2c_device_id wacom_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id wacom_i2c_of_match_table[] = {
+	{ .compatible = "wacom,wacom-i2c" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, wacom_i2c_of_match_table);
+#endif
+
 static struct i2c_driver wacom_i2c_driver = {
 	.driver	= {
 		.name	= "wacom_i2c",
 		.pm	= &wacom_i2c_pm,
+#ifdef CONFIG_OF
+		.of_match_table = of_match_ptr(wacom_i2c_of_match_table),
+#endif
 	},
 
 	.probe		= wacom_i2c_probe,
-- 
2.29.2