ar1021_i2c.c: introduce invert/swap/offsets options

Signed-off-by: Robert Nelson <[email protected]>

Author: RobertCNelson

drivers/input/touchscreen/ar1021_i2c.c

@@ -17,6 +17,7 @@
 
 #define AR1021_MAX_X	4095
 #define AR1021_MAX_Y	4095
+#define AR1021_MAX_PRESSURE 255
 
 #define AR1021_CMD	0x55
 
@@ -26,8 +27,29 @@ struct ar1021_i2c {
 	struct i2c_client *client;
 	struct input_dev *input;
 	u8 data[AR1021_TOCUH_PKG_SIZE];
+	bool invert_x;
+	bool invert_y;
+	bool swap_xy;
 };
 
+static bool ar1021_get_prop_u32(struct device *dev,
+				     const char *property,
+				     unsigned int default_value,
+				     unsigned int *value)
+{
+	u32 val;
+	int error;
+
+	error = device_property_read_u32(dev, property, &val);
+	if (error) {
+		*value = default_value;
+		return false;
+	}
+
+	*value = val;
+	return true;
+}
+
 static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)
 {
 	struct ar1021_i2c *ar1021 = dev_id;
@@ -49,9 +71,22 @@ static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)
 	x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f);
 	y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f);
 
-	input_report_abs(input, ABS_X, x);
-	input_report_abs(input, ABS_Y, y);
+	if (ar1021->invert_x)
+		x = AR1021_MAX_X - x;
+
+	if (ar1021->invert_y)
+		y = AR1021_MAX_Y - y;
+
+	if (ar1021->swap_xy) {
+		input_report_abs(input, ABS_X, y);
+		input_report_abs(input, ABS_Y, x);
+	} else {
+		input_report_abs(input, ABS_X, x);
+		input_report_abs(input, ABS_Y, y);
+	}
+
 	input_report_key(input, BTN_TOUCH, button);
+	input_report_abs(input, ABS_PRESSURE, AR1021_MAX_PRESSURE);
 	input_sync(input);
 
 out:
@@ -93,6 +128,8 @@ static int ar1021_i2c_probe(struct i2c_client *client,
 	struct ar1021_i2c *ar1021;
 	struct input_dev *input;
 	int error;
+	unsigned int offset_x, offset_y;
+	bool data_present;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "i2c_check_functionality error\n");
@@ -116,10 +153,44 @@ static int ar1021_i2c_probe(struct i2c_client *client,
 	input->open = ar1021_i2c_open;
 	input->close = ar1021_i2c_close;
 
+	ar1021->invert_x = device_property_read_bool(&client->dev, "touchscreen-inverted-x");
+	ar1021->invert_y = device_property_read_bool(&client->dev, "touchscreen-inverted-y");
+	ar1021->swap_xy = device_property_read_bool(&client->dev, "touchscreen-swapped-x-y");
+
+	data_present = ar1021_get_prop_u32(&client->dev,
+						"touchscreen-offset-x",
+						0,
+						&offset_x);
+
+	if (data_present)
+		dev_info(&client->dev, "touchscreen-offset-x: %d\n", offset_x);
+
+	data_present = ar1021_get_prop_u32(&client->dev,
+						"touchscreen-offset-y",
+						0,
+						&offset_y);
+
+	if (data_present)
+		dev_info(&client->dev, "touchscreen-offset-y: %d\n", offset_y);
+
 	__set_bit(INPUT_PROP_DIRECT, input->propbit);
-	input_set_capability(input, EV_KEY, BTN_TOUCH);
-	input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0);
-	input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0);
+	//input_set_capability(input, EV_KEY, BTN_TOUCH);
+
+	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	if(ar1021->swap_xy)
+	{
+		input_set_abs_params(input, ABS_X, 0, AR1021_MAX_Y, 0, 0);
+		input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_X, 0, 0);
+	}
+	else
+	{
+		input_set_abs_params(input, ABS_X, offset_x, AR1021_MAX_X-offset_x, 0, 0);
+		input_set_abs_params(input, ABS_Y, offset_y, AR1021_MAX_Y-offset_y, 0, 0);
+	}
+
+	input_set_abs_params(input, ABS_PRESSURE, 0, AR1021_MAX_PRESSURE, 0, 0);
 
 	input_set_drvdata(input, ar1021);