Input: apple_z2 - add a driver for Apple Z2 touchscreens

Adds a driver for Apple touchscreens using the Z2 protocol.

Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Link: https://lore.kernel.org/r/20250217-z2-v6-2-c2115d6e5a8f@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: WhatAmISupposedToPutHere

drivers/input/touchscreen/Kconfig

@@ -103,6 +103,19 @@ config TOUCHSCREEN_ADC
 	  To compile this driver as a module, choose M here: the
 	  module will be called resistive-adc-touch.ko.
 
+config TOUCHSCREEN_APPLE_Z2
+	tristate "Apple Z2 touchscreens"
+	default ARCH_APPLE
+	depends on SPI
+	help
+	  Say Y here if you have an Apple device with
+	  a touchscreen or a touchbar.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called apple_z2.
+
 config TOUCHSCREEN_AR1021_I2C
 	tristate "Microchip AR1020/1021 i2c touchscreen"
 	depends on I2C && OF

drivers/input/touchscreen/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879_I2C)	+= ad7879-i2c.o
 obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI)	+= ad7879-spi.o
 obj-$(CONFIG_TOUCHSCREEN_ADC)		+= resistive-adc-touch.o
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
+obj-$(CONFIG_TOUCHSCREEN_APPLE_Z2)	+= apple_z2.o
 obj-$(CONFIG_TOUCHSCREEN_AR1021_I2C)	+= ar1021_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT)	+= atmel_mxt_ts.o
 obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR)	+= auo-pixcir-ts.o