Win8 devices supporting hovering must provides InRange HID field.
The information that the finger is here but is not touching the surface
is sent to the user space through ABS_MT_DISTANCE as required by the
multitouch protocol.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>
---
drivers/hid/hid-multitouch.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6d4ad30..5aebbff 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -55,7 +55,7 @@ MODULE_LICENSE("GPL");
#define MT_QUIRK_WIN_8_CERTIFIED (1 << 10)
struct mt_slot {
- __s32 x, y, cx, cy, p, w, h;
+ __s32 x, y, cx, cy, z, p, w, h;
__s32 contactid; /* the device ContactID assigned to this slot */
bool touch_state; /* is the touch valid? */
};
@@ -394,6 +394,12 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_UP_DIGITIZER:
switch (usage->hid) {
case HID_DG_INRANGE:
+ if (cls->quirks & MT_QUIRK_WIN_8_CERTIFIED) {
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_DISTANCE);
+ input_set_abs_params(hi->input,
+ ABS_MT_DISTANCE, 0, 1, 0, 0);
+ }
mt_store_field(usage, td, hi);
td->last_field_index = field->index;
return 1;
@@ -511,6 +517,11 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
struct mt_slot *s = &td->curdata;
if (td->mtclass.quirks & MT_QUIRK_WIN_8_CERTIFIED &&
+ !test_bit(ABS_MT_DISTANCE, input->absbit))
+ /* If InRange is not present, rely on TipSwitch */
+ s->touch_state = !s->z;
+
+ if (td->mtclass.quirks & MT_QUIRK_WIN_8_CERTIFIED &&
!s->touch_state) {
struct input_mt_slot *slot = &input->mt->slots[slotnum];
int prv_x = input_mt_get_value(slot, ABS_MT_POSITION_X);
@@ -543,6 +554,7 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
input_event(input, EV_ABS, ABS_MT_TOOL_Y,
s->cy);
}
+ input_event(input, EV_ABS, ABS_MT_DISTANCE, s->z);
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);
@@ -575,11 +587,16 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
case HID_DG_INRANGE:
if (quirks & MT_QUIRK_VALID_IS_INRANGE)
td->curvalid = value;
+ if (quirks & MT_QUIRK_WIN_8_CERTIFIED)
+ td->curdata.touch_state = value;
break;
case HID_DG_TIPSWITCH:
if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
td->curvalid = value;
- td->curdata.touch_state = value;
+ if (quirks & MT_QUIRK_WIN_8_CERTIFIED)
+ td->curdata.z = !value;
+ else
+ td->curdata.touch_state = value;
break;
case HID_DG_CONFIDENCE:
if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
--
1.7.11.7
--
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