Input: goodix - allow specifying the config filename

The config which needs to be send to the controller on some device-models
is model-specific. Allow specifying a model-specific filename through
a device-property, rather then always using a fixed filename.

Note the "goodix,config-name" device-property used by this is
*not* documented in the
Documentation/devicetree/bindings/input/touchscreen/goodix.yaml
device-tree bindings for now.

Not documenting these is intentional. This is done because this code has
only been tested on x86/ACPI so far, where devicetree is not used.
Instead these properties are set through a software-fwnode attached to the
device by the drivers/platform/x86/touchscreen_dmi.c code. This means that
the use of this property for now is purely a kernel-internal thing and
the name/working of the property may still be changed for now.

Reviewed-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210920150643.155872-6-hdegoede@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/touchscreen/goodix.h b/drivers/input/touchscreen/goodix.h
index 0b88554..b1d1bc0 100644
--- a/drivers/input/touchscreen/goodix.h
+++ b/drivers/input/touchscreen/goodix.h
@@ -52,8 +52,8 @@ struct goodix_ts_data {
 	int gpio_count;
 	int gpio_int_idx;
 	char id[GOODIX_ID_MAX_LEN + 1];
+	char cfg_name[64];
 	u16 version;
-	const char *cfg_name;
 	bool reset_controller_at_probe;
 	bool load_cfg_from_disk;
 	struct completion firmware_loading_complete;