On Wed, Nov 14, 2012 at 04:59:24PM +0100, Benjamin Tissoires wrote:
> 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 <[email protected]>
> ---
> drivers/hid/hid-multitouch.c | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index c5b81a7..5f26b2f 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -53,11 +53,13 @@ MODULE_LICENSE("GPL");
> #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8)
> #define MT_QUIRK_NO_AREA (1 << 9)
> #define MT_QUIRK_IGNORE_DUPLICATES (1 << 10)
> +#define MT_QUIRK_HOVERING (1 << 11)
>
> struct mt_slot {
> __s32 x, y, cx, cy, p, w, h;
> __s32 contactid; /* the device ContactID assigned to this slot */
> bool touch_state; /* is the touch valid? */
> + bool inrange_state; /* is the finger in proximity of the sensor? */
> };
>
> struct mt_class {
> @@ -392,6 +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_HOVERING) {
> + 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;
> @@ -521,9 +529,9 @@ static void mt_complete_slot(struct mt_device *td, struct
> input_dev *input)
>
> input_mt_slot(input, slotnum);
> input_mt_report_slot_state(input, MT_TOOL_FINGER,
> - s->touch_state);
> - if (s->touch_state) {
> - /* this finger is on the screen */
> + s->touch_state || s->inrange_state);
> + if (s->touch_state || s->inrange_state) {
> + /* this finger is in proximity of the sensor */
> int wide = (s->w > s->h);
> /* divided by two to match visual scale of touch */
> int major = max(s->w, s->h) >> 1;
> @@ -533,6 +541,8 @@ static void mt_complete_slot(struct mt_device *td, struct
> input_dev *input)
> 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_DISTANCE,
> + !s->touch_state);
> 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);
> @@ -565,6 +575,8 @@ 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_HOVERING)
> + td->curdata.inrange_state = value;
> break;
> case HID_DG_TIPSWITCH:
> if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
> --
> 1.8.0
>
Reviewed-by: Henrik Rydberg <[email protected]>
Thanks,
Henrik
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