input: mt: Add hovering distance axis (e42a98b5) · Commits · 戴 / test

Documentation/input/multi-touch-protocol.txt

+8 −1

Original line number	Diff line number	Diff line
		@@ -161,7 +161,8 @@ against the glass. The inner region will increase, and in general, the
		ratio ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR, which is always smaller than
		unity, is related to the contact pressure. For pressure-based devices,
		ABS_MT_PRESSURE may be used to provide the pressure on the contact area
		instead.
		instead. Devices capable of contact hovering can use ABS_MT_DISTANCE to
		indicate the distance between the contact and the surface.

		In addition to the MAJOR parameters, the oval shape of the contact can be
		described by adding the MINOR parameters, such that MAJOR and MINOR are the
		@@ -213,6 +214,12 @@ The pressure, in arbitrary units, on the contact area. May be used instead
		of TOUCH and WIDTH for pressure-based devices or any device with a spatial
		signal intensity distribution.

		ABS_MT_DISTANCE

		The distance, in surface units, between the contact and the surface. Zero
		distance means the contact is touching the surface. A positive number means
		the contact is hovering above the surface.

		ABS_MT_ORIENTATION

		The orientation of the ellipse. The value should describe a signed quarter

+2 −1

Original line number	Diff line number	Diff line
		@@ -733,11 +733,12 @@ struct input_keymap_entry {
		#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
		#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
		#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
		#define ABS_MT_DISTANCE 0x3b /* Contact hover distance */

		#ifdef __KERNEL__
		/* Implementation details, userspace should not care about these */
		#define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
		#define ABS_MT_LAST ABS_MT_PRESSURE
		#define ABS_MT_LAST ABS_MT_DISTANCE
		#endif

		#define ABS_MAX 0x3f