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Input: wacom - fix touch parsing on newer Bamboos 

Bamboos with Product ID's > 0xD4 return values unrelated to pressure
in touch 1 pressure field.  They also report 2nd touch X/Y values
shifted down 1 byte (where pressure was).  This results in jumpy
1 finger touch and totally invalid 2nd finger data.

For touch detection, switch to a Touch Present single bit that
all versions of Bamboo support.

For touch 2 offset, calculate offset based on a bit that is set
different between the two packet layouts.

Since touch pressure reports were removed from driver, there was
no need to be reading pressure any more.

Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Reviewed-by: Ping Cheng <pinglinux@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Chris Bagwell 2011-09-09 13:38:10 -07:00 committed by Dmitry Torokhov
parent 1c601beaf2
commit 8f9068609e
1 changed files with 8 additions and 6 deletions
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14
drivers/input/tablet/wacom_wac.c
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@ -800,20 +800,22 @@ static int wacom_bpt_touch(struct wacom_wac *wacom)
int i;
for (i = 0; i < 2; i++) {
int p = data[9 * i + 2];
bool touch = p && !wacom->shared->stylus_in_proximity;
int offset = (data[1] & 0x80) ? (8 * i) : (9 * i);
bool touch = data[offset + 3] & 0x80;
input_mt_slot(input, i);
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
/*
* Touch events need to be disabled while stylus is
* in proximity because user's hand is resting on touchpad
* and sending unwanted events. User expects tablet buttons
* to continue working though.
*/
touch = touch && !wacom->shared->stylus_in_proximity;
input_mt_slot(input, i);
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
if (touch) {
int x = get_unaligned_be16(&data[9 * i + 3]) & 0x7ff;
int y = get_unaligned_be16(&data[9 * i + 5]) & 0x7ff;
int x = get_unaligned_be16(&data[offset + 3]) & 0x7ff;
int y = get_unaligned_be16(&data[offset + 5]) & 0x7ff;
if (features->quirks & WACOM_QUIRK_BBTOUCH_LOWRES) {
x <<= 5;
y <<= 5;