On Wed, Nov 07, 2012 at 05:37:30PM +0100, Benjamin Tissoires wrote:
> 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@xxxxxxxxx>
> ---
> drivers/hid/hid-multitouch.c | 46 +++++++++++++++++++++++++++++++++++---------
> 1 file changed, 37 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index ae57b8f..54367f4 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -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? */
> };
> @@ -323,6 +323,7 @@ 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
> @@ -345,23 +346,42 @@ 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;
> @@ -502,6 +522,8 @@ 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);
> @@ -553,10 +575,16 @@ 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;
> --
> 1.7.11.7
>
Reviewed-by: Henrik Rydberg <rydberg@xxxxxxxxxxx>
Thanks,
Henrik
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