[PATCH 2/3] input/touchscreen: Add device tree support to wacom_i2c

[Alistair Francis]

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

Signed-off-by: Alistair Francis <alist...@alistair23.me>
---
 drivers/input/touchscreen/wacom_i2c.c | 38 +++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/input/touchscreen/wacom_i2c.c 
b/drivers/input/touchscreen/wacom_i2c.c
index 1afc6bde2891..54af2934ba17 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <asm/unaligned.h>
 
 #define WACOM_CMD_QUERY0       0x04
@@ -35,6 +36,13 @@ struct wacom_i2c {
        u8 data[WACOM_QUERY_SIZE];
        bool prox;
        int tool;
+
+       bool flip_tilt_x;
+       bool flip_tilt_y;
+       bool flip_pos_x;
+       bool flip_pos_y;
+       bool flip_distance;
+       bool flip_pressure;
 };
 
 static int wacom_query_device(struct i2c_client *client,
@@ -144,6 +152,20 @@ static void wacom_i2c_close(struct input_dev *dev)
        disable_irq(client->irq);
 }
 
+#ifdef CONFIG_OF
+static void wacom_of_read(struct wacom_i2c *wac_i2c)
+{
+       struct i2c_client *client = wac_i2c->client;
+
+       wac_i2c->flip_tilt_x = of_property_read_bool(client->dev.of_node, 
"flip-tilt-x");
+       wac_i2c->flip_tilt_y = of_property_read_bool(client->dev.of_node, 
"flip-tilt-y");
+       wac_i2c->flip_pos_x = of_property_read_bool(client->dev.of_node, 
"flip-pos-x");
+       wac_i2c->flip_pos_y = of_property_read_bool(client->dev.of_node, 
"flip-pos-y");
+       wac_i2c->flip_distance = of_property_read_bool(client->dev.of_node, 
"flip-distance");
+       wac_i2c->flip_pressure = of_property_read_bool(client->dev.of_node, 
"flip-pressure");
+}
+#endif
+
 static int wacom_i2c_probe(struct i2c_client *client,
                                     const struct i2c_device_id *id)
 {
@@ -214,6 +236,11 @@ static int wacom_i2c_probe(struct i2c_client *client,
        }
 
        i2c_set_clientdata(client, wac_i2c);
+
+#ifdef CONFIG_OF
+       wacom_of_read(wac_i2c);
+#endif
+
        return 0;
 
 err_free_irq:
@@ -262,10 +289,21 @@ 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