[PATCH 3/4] Input: silead - Add a settings module-parameter

[Hans de Goede <hdegoede@redhat.com>]

Add a settings module-parameter which can be allowed to specify/override
various device-properties.

Unlike most other touchscreen controllers Silead touchscreens don't tell us
the ranges of the reported x and y coordinates and Silead touchscreens also
often need to have their axis inverted and/or swapped to match the display
coordinates.

Being able to specify the necessary properties through a module parameter,
allows users of new device-models to help us with bringing up support for
new devices without them needing to do a local kernel-build just to modify
these settings.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/input/touchscreen/silead.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
index 3eef8c01090f..3a3115702a13 100644
--- a/drivers/input/touchscreen/silead.c
+++ b/drivers/input/touchscreen/silead.c
@@ -58,6 +58,10 @@
 
 #define SILEAD_MAX_FINGERS	10
 
+static char *settings;
+module_param(settings, charp, 0444);
+MODULE_PARM_DESC(settings, "Override touchscreen settings using a ; separated key=value list, e.g. \"touchscreen-size-x=1665;touchscreen-size-y=1140;touchscreen-swapped-x-y\"");
+
 enum silead_ts_power {
 	SILEAD_POWER_ON  = 1,
 	SILEAD_POWER_OFF = 0
@@ -133,14 +137,15 @@ static int silead_ts_request_input_dev(struct silead_ts_data *data)
 
 	input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
 	input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
-	touchscreen_parse_properties(data->input, true, &data->prop);
+	touchscreen_parse_properties_with_settings(data->input, true,
+						   &data->prop, settings);
 	silead_apply_efi_fw_min_max(data);
 
 	input_mt_init_slots(data->input, data->max_fingers,
 			    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
 			    INPUT_MT_TRACK);
 
-	if (device_property_read_bool(dev, "silead,home-button"))
+	if (touchscreen_property_read_bool(dev, "silead,home-button", settings))
 		input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
 
 	data->input->name = SILEAD_TS_NAME;
@@ -173,7 +178,8 @@ static int silead_ts_request_pen_input_dev(struct silead_ts_data *data)
 	input_set_capability(data->pen_input, EV_KEY, BTN_TOUCH);
 	input_set_capability(data->pen_input, EV_KEY, BTN_TOOL_PEN);
 	set_bit(INPUT_PROP_DIRECT, data->pen_input->propbit);
-	touchscreen_parse_properties(data->pen_input, false, &data->prop);
+	touchscreen_parse_properties_with_settings(data->pen_input, false,
+						   &data->prop, settings);
 	input_abs_set_res(data->pen_input, ABS_X, data->pen_x_res);
 	input_abs_set_res(data->pen_input, ABS_Y, data->pen_y_res);
 
@@ -523,8 +529,8 @@ static int silead_ts_setup(struct i2c_client *client)
 	 * this.
 	 */
 
-	if (device_property_read_bool(&client->dev,
-				      "silead,stuck-controller-bug")) {
+	if (touchscreen_property_read_bool(&client->dev, "silead,stuck-controller-bug",
+					   settings)) {
 		pm_runtime_set_active(&client->dev);
 		pm_runtime_enable(&client->dev);
 		pm_runtime_allow(&client->dev);
@@ -591,8 +597,8 @@ static void silead_ts_read_props(struct i2c_client *client)
 	const char *str;
 	int error;
 
-	error = device_property_read_u32(dev, "silead,max-fingers",
-					 &data->max_fingers);
+	error = touchscreen_property_read_u32(dev, "silead,max-fingers", settings,
+					      &data->max_fingers);
 	if (error) {
 		dev_dbg(dev, "Max fingers read error %d\n", error);
 		data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
@@ -605,9 +611,9 @@ static void silead_ts_read_props(struct i2c_client *client)
 	else
 		dev_dbg(dev, "Firmware file name read error. Using default.");
 
-	data->pen_supported = device_property_read_bool(dev, "silead,pen-supported");
-	device_property_read_u32(dev, "silead,pen-resolution-x", &data->pen_x_res);
-	device_property_read_u32(dev, "silead,pen-resolution-y", &data->pen_y_res);
+	data->pen_supported = touchscreen_property_read_bool(dev, "silead,pen-supported", settings);
+	touchscreen_property_read_u32(dev, "silead,pen-resolution-x", settings, &data->pen_x_res);
+	touchscreen_property_read_u32(dev, "silead,pen-resolution-y", settings, &data->pen_y_res);
 }
 
 #ifdef CONFIG_ACPI
-- 
2.37.3