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.
We recognize Win8 certified devices from their vendor feature 0xff0000c5
where Microsoft put a signed blob in the report to check if the device
passed the certification.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>
---
drivers/hid/hid-multitouch.c | 53 ++++++++++++++++++++++++++++++++++++--------
1 file changed, 44 insertions(+), 9 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 38a4feb..ff2354c 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -52,9 +52,10 @@ MODULE_LICENSE("GPL");
#define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 6)
#define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8)
#define MT_QUIRK_NO_AREA (1 << 9)
+#define MT_QUIRK_WIN_8_CERTIFIED (1 << 10)
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? */
};
@@ -292,6 +293,10 @@ static void mt_feature_mapping(struct hid_device *hdev,
td->maxcontacts = td->mtclass.maxcontacts;
break;
+ case 0xff0000c5:
+ if (field->report_count == 256 && field->report_size == 8)
+ td->mtclass.quirks |= MT_QUIRK_WIN_8_CERTIFIED;
+ break;
}
}
@@ -350,18 +355,36 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
- hid_map_usage(hi, usage, bit, max,
+ if (cls->quirks & MT_QUIRK_WIN_8_CERTIFIED &&
+ usage_index) {
+ 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 (cls->quirks & MT_QUIRK_WIN_8_CERTIFIED &&
+ usage_index) {
+ 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;
@@ -502,6 +525,12 @@ 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);
+ if (td->mtclass.quirks & MT_QUIRK_WIN_8_CERTIFIED) {
+ 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);
@@ -553,10 +582,16 @@ 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_POSITION_X)
+ td->curdata.x = value;
+ else
+ td->curdata.cx = value;
break;
case HID_GD_Y:
- td->curdata.y = value;
+ if (usage->code == ABS_MT_POSITION_Y)
+ td->curdata.y = value;
+ else
+ td->curdata.cy = value;
break;
case HID_DG_WIDTH:
td->curdata.w = value;
--
1.7.11.7
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