HID: i2c-hid-of: Expose the touchscreen-inverted properties

Allow the touchscreen-inverted-x/y device tree properties to control the
HID_QUIRK_X_INVERT/HID_QUIRK_Y_INVERT quirks for the hid-input device.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Acked-by: Rob Herring <robh@kernel.org>
[bentiss: silence checkpatch warnings]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211208124045.61815-3-alistair@alistair23.me

Author: alistair23

Documentation/devicetree/bindings/input/hid-over-i2c.txt

@@ -32,6 +32,8 @@ device-specific compatible properties, which should be used in addition to the
 - vdd-supply: phandle of the regulator that provides the supply voltage.
 - post-power-on-delay-ms: time required by the device after enabling its regulators
   or powering it on, before it is ready for communication.
+- touchscreen-inverted-x: See touchscreen.txt
+- touchscreen-inverted-y: See touchscreen.txt
 
 Example:
 

drivers/hid/i2c-hid/i2c-hid-acpi.c

@@ -111,7 +111,7 @@ static int i2c_hid_acpi_probe(struct i2c_client *client)
 	}
 
 	return i2c_hid_core_probe(client, &ihid_acpi->ops,
-				  hid_descriptor_address);
+				  hid_descriptor_address, 0);
 }
 
 static const struct acpi_device_id i2c_hid_acpi_match[] = {

drivers/hid/i2c-hid/i2c-hid-core.c

@@ -912,7 +912,7 @@ static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid)
 }
 
 int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
-		       u16 hid_descriptor_address)
+		       u16 hid_descriptor_address, u32 quirks)
 {
 	int ret;
 	struct i2c_hid *ihid;
@@ -1009,6 +1009,8 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
 		goto err_mem_free;
 	}
 
+	hid->quirks |= quirks;
+
 	return 0;
 
 err_mem_free:

drivers/hid/i2c-hid/i2c-hid-of-goodix.c

@@ -150,7 +150,7 @@ static int i2c_hid_of_goodix_probe(struct i2c_client *client,
 		goodix_i2c_hid_deassert_reset(ihid_goodix, true);
 	mutex_unlock(&ihid_goodix->regulator_mutex);
 
-	return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001);
+	return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);
 }
 
 static const struct goodix_i2c_hid_timing_data goodix_gt7375p_timing_data = {

drivers/hid/i2c-hid/i2c-hid-of.c

@@ -21,6 +21,7 @@
 
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/hid.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -71,6 +72,7 @@ static int i2c_hid_of_probe(struct i2c_client *client,
 	struct device *dev = &client->dev;
 	struct i2c_hid_of *ihid_of;
 	u16 hid_descriptor_address;
+	u32 quirks = 0;
 	int ret;
 	u32 val;
 
@@ -105,8 +107,14 @@ static int i2c_hid_of_probe(struct i2c_client *client,
 	if (ret)
 		return ret;
 
+	if (device_property_read_bool(dev, "touchscreen-inverted-x"))
+		quirks |= HID_QUIRK_X_INVERT;
+
+	if (device_property_read_bool(dev, "touchscreen-inverted-y"))
+		quirks |= HID_QUIRK_Y_INVERT;
+
 	return i2c_hid_core_probe(client, &ihid_of->ops,
-				  hid_descriptor_address);
+				  hid_descriptor_address, quirks);
 }
 
 static const struct of_device_id i2c_hid_of_match[] = {

drivers/hid/i2c-hid/i2c-hid.h

@@ -32,7 +32,7 @@ struct i2chid_ops {
 };
 
 int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
-		       u16 hid_descriptor_address);
+		       u16 hid_descriptor_address, u32 quirks);
 int i2c_hid_core_remove(struct i2c_client *client);
 
 void i2c_hid_core_shutdown(struct i2c_client *client);