Commit 48216fbd authored by Henrik Rydberg's avatar Henrik Rydberg Committed by Jiri Kosina
Browse files

HID: 3m: Adjust major / minor axes to scale 



By visual inspection, the reported touch_major and touch_minor axes
are a factor of two too large. Presumably the device actually reports
the width_major and width_minor, which are generally about a factor of
two larger than the touches themselves.

Signed-off-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 1d958c83

drivers/hid/hid-3m-pct.c

+6 −4
Original line number Diff line number Diff line
@@ -166,16 +166,18 @@ static void mmm_filter_event(struct mmm_data *md, struct input_dev *input) 
		if (f->touch) {

			/* this finger is on the screen */

			int wide = (f->w > f->h);

			/* divided by two to match visual scale of touch */

			int major = max(f->w, f->h) >> 1;

			int minor = min(f->w, f->h) >> 1;



			if (!f->prev_touch)

				f->id = md->id++;

			input_event(input, EV_ABS, ABS_MT_TRACKING_ID, f->id);

			input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);

			input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);

			input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);

			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR,

						wide ? f->w : f->h);

			input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR,

						wide ? f->h : f->w);

			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);

			input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);

			/* touchscreen emulation: pick the oldest contact */

			if (!oldest || ((f->id - oldest->id) & (SHRT_MAX + 1)))

				oldest = f;

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