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HID: wacom: Clean up value reading

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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@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2015-11-30 17:13:51 -08:00 committed by Jiri Kosina
parent 571f572f9a
commit 5f33f430ef
1 changed files with 14 additions and 13 deletions
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27
drivers/hid/wacom_wac.c
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@ -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,