Merge branch 'for-6.18/haptic' into for-linus

- Implement haptic touchpad support (Angela Czubak and Jonathan Denose)

Author: Benjamin Tissoires

Documentation/input/event-codes.rst

@@ -400,6 +400,20 @@ can report through the rotational axes (absolute and/or relative rx, ry, rz).
 All other axes retain their meaning. A device must not mix
 regular directional axes and accelerometer axes on the same event node.
 
+INPUT_PROP_HAPTIC_TOUCHPAD
+--------------------------
+
+The INPUT_PROP_HAPTIC_TOUCHPAD property indicates that device:
+- supports simple haptic auto and manual triggering
+- can differentiate between at least 5 fingers
+- uses correct resolution for the X/Y (units and value)
+- reports correct force per touch, and correct units for them (newtons or grams)
+- follows the MT protocol type B
+
+Summing up, such devices follow the MS spec for input devices in
+Win8 and Win8.1, and in addition support the Simple haptic controller HID table,
+and report correct units for the pressure.
+
 Guidelines
 ==========
 

drivers/hid/Kconfig

@@ -92,6 +92,17 @@ config HID_GENERIC
 
 	If unsure, say Y.
 
+config HID_HAPTIC
+	tristate "Haptic touchpad support"
+	default n
+	help
+	Support for touchpads with force sensors and haptic actuators instead of a
+	traditional button.
+	Adds extra parsing and FF device for the hid multitouch driver.
+	It can be used for Elan 2703 haptic touchpad.
+
+	If unsure, say N.
+
 menu "Special HID drivers"
 
 config HID_A4TECH

drivers/hid/Makefile

@@ -4,6 +4,7 @@
 #
 hid-y			:= hid-core.o hid-input.o hid-quirks.o
 hid-$(CONFIG_DEBUG_FS)		+= hid-debug.o
+hid-$(CONFIG_HID_HAPTIC)	+= hid-haptic.o
 
 obj-$(CONFIG_HID_BPF)		+= bpf/