Input: synaptics-rmi4 - add support for F12

Function 12 implements 2D touch position sensor for newer Synaptics touch
devices. It replaces F11 and no device will contain both functions.
Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Christopher Heiny <cheiny@synaptics.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/Kconfig

@@ -32,3 +32,14 @@ config RMI4_F11
 	  Function 11 provides 2D multifinger pointing for touchscreens and
 	  touchpads. For sensors that support relative pointing, F11 also
 	  provides mouse input.
+
+config RMI4_F12
+	bool "RMI4 Function 12 (2D pointing)"
+	select RMI4_2D_SENSOR
+	depends on RMI4_CORE
+	help
+	  Say Y here if you want to add support for RMI4 function 12.
+
+	  Function 12 provides 2D multifinger pointing for touchscreens and
+	  touchpads. For sensors that support relative pointing, F12 also
+	  provides mouse input.

drivers/input/rmi4/Makefile

@@ -5,6 +5,7 @@ rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
 
 # Function drivers
 rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
+rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
 
 # Transports
 obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o

drivers/input/rmi4/rmi_bus.c

@@ -309,6 +309,9 @@ static struct rmi_function_handler *fn_handlers[] = {
 #ifdef CONFIG_RMI4_F11
 	&rmi_f11_handler,
 #endif
+#ifdef CONFIG_RMI4_F12
+	&rmi_f12_handler,
+#endif
 };
 
 static void __rmi_unregister_function_handlers(int start_idx)

drivers/input/rmi4/rmi_driver.h

@@ -100,4 +100,5 @@ char *rmi_f01_get_product_ID(struct rmi_function *fn);
 
 extern struct rmi_function_handler rmi_f01_handler;
 extern struct rmi_function_handler rmi_f11_handler;
+extern struct rmi_function_handler rmi_f12_handler;
 #endif