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Commit 349fd670 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina
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HID: multitouch: support T and C for win8 devices



Win8 input specification clarifies the X and Y sent by devices.
It distincts the position where the user wants to Touch (T) from
the center of the ellipsoide (C). This patch enable supports for this
distinction in hid-multitouch.

Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent afbcb04c
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+37 −9
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ MODULE_LICENSE("GPL");
#define MT_QUIRK_NO_AREA		(1 << 9)

struct mt_slot {
	__s32 x, y, p, w, h;
	__s32 x, y, cx, cy, p, w, h;
	__s32 contactid;	/* the device ContactID assigned to this slot */
	bool touch_state;	/* is the touch valid? */
};
@@ -322,6 +322,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
	struct mt_device *td = hid_get_drvdata(hdev);
	struct mt_class *cls = &td->mtclass;
	int code;
	struct hid_usage *prev_usage = NULL;

	/* Only map fields from TouchScreen or TouchPad collections.
	* We need to ignore fields that belong to other collections
@@ -344,23 +345,42 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
	if (field->physical == HID_DG_STYLUS)
		return -1;

	if (usage->usage_index)
		prev_usage = &field->usage[usage->usage_index - 1];

	switch (usage->hid & HID_USAGE_PAGE) {

	case HID_UP_GENDESK:
		switch (usage->hid) {
		case HID_GD_X:
			if (prev_usage && (prev_usage->hid == usage->hid)) {
				hid_map_usage(hi, usage, bit, max,
					EV_ABS, ABS_MT_TOOL_X);
				set_abs(hi->input, ABS_MT_TOOL_X, field,
					cls->sn_move);
			} else {
				hid_map_usage(hi, usage, bit, max,
					EV_ABS, ABS_MT_POSITION_X);
				set_abs(hi->input, ABS_MT_POSITION_X, field,
					cls->sn_move);
			}

			mt_store_field(usage, td, hi);
			td->last_field_index = field->index;
			return 1;
		case HID_GD_Y:
			if (prev_usage && (prev_usage->hid == usage->hid)) {
				hid_map_usage(hi, usage, bit, max,
					EV_ABS, ABS_MT_TOOL_Y);
				set_abs(hi->input, ABS_MT_TOOL_Y, field,
					cls->sn_move);
			} else {
				hid_map_usage(hi, usage, bit, max,
					EV_ABS, ABS_MT_POSITION_Y);
				set_abs(hi->input, ABS_MT_POSITION_Y, field,
					cls->sn_move);
			}

			mt_store_field(usage, td, hi);
			td->last_field_index = field->index;
			return 1;
@@ -501,6 +521,8 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)

			input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
			input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
			input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
			input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
			input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
			input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
@@ -552,9 +574,15 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
			td->curdata.p = value;
			break;
		case HID_GD_X:
			if (usage->code == ABS_MT_TOOL_X)
				td->curdata.cx = value;
			else
				td->curdata.x = value;
			break;
		case HID_GD_Y:
			if (usage->code == ABS_MT_TOOL_Y)
				td->curdata.cy = value;
			else
				td->curdata.y = value;
			break;
		case HID_DG_WIDTH: