Make the logic for reading X, Y, distance, and pressure a bit more
clear. An additional bit was stuffed into the packet format many
models back, and /most/ devices in use will use it. If we happen
to be dealing with a particularly old tablet, just shift it off
the end to pretend we never read it.
Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
---
drivers/hid/wacom_wac.c | 27 ++++++++++++++-------------
1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index ce3afab..0008650 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -887,21 +887,23 @@ static int wacom_intuos_general(struct wacom_wac *wacom)
struct input_dev *input = wacom->pen_input;
int idx = (features->type == INTUOS) ? (data[1] & 0x01) : 0;
unsigned char type = (data[1] >> 1) & 0x0F;
- unsigned int t;
+ unsigned int x, y, distance, t;
if (data[0] != WACOM_REPORT_PENABLED && data[0] != WACOM_REPORT_CINTIQ &&
data[0] != WACOM_REPORT_INTUOS_PEN)
return 0;
- if (features->type >= INTUOS3S) {
- input_report_abs(input, ABS_X, (data[2] << 9) | (data[3] << 1) | ((data[9] >> 1) & 1));
- input_report_abs(input, ABS_Y, (data[4] << 9) | (data[5] << 1) | (data[9] & 1));
- input_report_abs(input, ABS_DISTANCE, ((data[9] >> 2) & 0x3f));
- } else {
- input_report_abs(input, ABS_X, be16_to_cpup((__be16 *)&data[2]));
- input_report_abs(input, ABS_Y, be16_to_cpup((__be16 *)&data[4]));
- input_report_abs(input, ABS_DISTANCE, ((data[9] >> 3) & 0x1f));
+ x = (be16_to_cpup((__be16 *)&data[2]) << 1) | ((data[9] >> 1) & 1);
+ y = (be16_to_cpup((__be16 *)&data[4]) << 1) | (data[9] & 1);
+ distance = data[9] >> 2;
+ if (features->type < INTUOS3S) {
+ x >>= 1;
+ y >>= 1;
+ distance >>= 1;
}
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+ input_report_abs(input, ABS_DISTANCE, distance);
switch (type) {
case 0x00:
@@ -909,10 +911,9 @@ static int wacom_intuos_general(struct wacom_wac *wacom)
case 0x02:
case 0x03:
/* general pen packet */
- t = (data[6] << 2) | ((data[7] >> 6) & 3);
- if (features->pressure_max == 2047) {
- t = (t << 1) | (data[1] & 1);
- }
+ t = (data[6] << 3) | ((data[7] & 0xC0) >> 5) | (data[1] & 1);
+ if (features->pressure_max < 2047)
+ t >>= 1;
input_report_abs(input, ABS_PRESSURE, t);
if (features->type != INTUOSHT2) {
input_report_abs(input, ABS_TILT_X,
--
2.6.2
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