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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: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2012-11-14 16:59:19 +01:00 committed by Jiri Kosina
parent afbcb04c18
commit 349fd6705b
1 changed files with 37 additions and 9 deletions
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46
drivers/hid/hid-multitouch.c
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@ -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:
hid_map_usage(hi, usage, bit, max,
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);
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:
hid_map_usage(hi, usage, bit, max,
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);
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);
@ -552,10 +574,16 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
td->curdata.p = value;
break;
case HID_GD_X:
td->curdata.x = value;
if (usage->code == ABS_MT_TOOL_X)
td->curdata.cx = value;
else
td->curdata.x = value;
break;
case HID_GD_Y:
td->curdata.y = value;
if (usage->code == ABS_MT_TOOL_Y)
td->curdata.cy = value;
else
td->curdata.y = value;
break;
case HID_DG_WIDTH:
td->curdata.w = value;