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Input: appletouch - fix jumps when additional fingers are detected 

Addresses issues related to when a second finger enters or leaves the
field, causing the cursor to jump or the page to scroll unexpectedly; now,
we discard any movement change that happens at the exact moment we detect a
change in the number of fingers touching the trackpad. This doesn't
completely resolve the issue but does greatly mitigate it.

Signed-off-by: Clinton Sprain <clintonsprain@gmail.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Clinton Sprain 2014-03-30 23:37:05 -07:00 committed by Dmitry Torokhov
parent 739204bc95
commit 7bbdba56ba
1 changed files with 21 additions and 6 deletions
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27
drivers/input/mouse/appletouch.c
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@ -218,6 +218,7 @@ struct atp {
bool valid; /* are the samples valid? */
bool size_detect_done;
bool overflow_warned;
int fingers_old; /* last reported finger count */
int x_old; /* last reported x/y, */
int y_old; /* used for smoothing */
signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS];
@ -528,7 +529,7 @@ static void atp_complete_geyser_1_2(struct urb *urb)
{
int x, y, x_z, y_z, x_f, y_f;
int retval, i, j;
int key;
int key, fingers;
struct atp *dev = urb->context;
int status = atp_status_check(urb);
@ -611,7 +612,9 @@ static void atp_complete_geyser_1_2(struct urb *urb)
dev->info->yfact, &y_z, &y_f);
key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON;
if (x && y) {
fingers = max(x_f, y_f);
if (x && y && fingers == dev->fingers_old) {
if (dev->x_old != -1) {
x = (dev->x_old * 7 + x) >> 3;
y = (dev->y_old * 7 + y) >> 3;
@ -628,7 +631,7 @@ static void atp_complete_geyser_1_2(struct urb *urb)
input_report_abs(dev->input, ABS_Y, y);
input_report_abs(dev->input, ABS_PRESSURE,
min(ATP_PRESSURE, x_z + y_z));
atp_report_fingers(dev->input, max(x_f, y_f));
atp_report_fingers(dev->input, fingers);
}
dev->x_old = x;
dev->y_old = y;
@ -636,6 +639,7 @@ static void atp_complete_geyser_1_2(struct urb *urb)
} else if (!x && !y) {
dev->x_old = dev->y_old = -1;
dev->fingers_old = 0;
input_report_key(dev->input, BTN_TOUCH, 0);
input_report_abs(dev->input, ABS_PRESSURE, 0);
atp_report_fingers(dev->input, 0);
@ -644,6 +648,10 @@ static void atp_complete_geyser_1_2(struct urb *urb)
memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
}
if (fingers != dev->fingers_old)
dev->x_old = dev->y_old = -1;
dev->fingers_old = fingers;
input_report_key(dev->input, BTN_LEFT, key);
input_sync(dev->input);
@ -661,7 +669,7 @@ static void atp_complete_geyser_3_4(struct urb *urb)
{
int x, y, x_z, y_z, x_f, y_f;
int retval, i, j;
int key;
int key, fingers;
struct atp *dev = urb->context;
int status = atp_status_check(urb);
@ -724,7 +732,9 @@ static void atp_complete_geyser_3_4(struct urb *urb)
key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON;
if (x && y) {
fingers = max(x_f, y_f);
if (x && y && fingers == dev->fingers_old) {
if (dev->x_old != -1) {
x = (dev->x_old * 7 + x) >> 3;
y = (dev->y_old * 7 + y) >> 3;
@ -741,7 +751,7 @@ static void atp_complete_geyser_3_4(struct urb *urb)
input_report_abs(dev->input, ABS_Y, y);
input_report_abs(dev->input, ABS_PRESSURE,
min(ATP_PRESSURE, x_z + y_z));
atp_report_fingers(dev->input, max(x_f, y_f));
atp_report_fingers(dev->input, fingers);
}
dev->x_old = x;
dev->y_old = y;
@ -749,6 +759,7 @@ static void atp_complete_geyser_3_4(struct urb *urb)
} else if (!x && !y) {
dev->x_old = dev->y_old = -1;
dev->fingers_old = 0;
input_report_key(dev->input, BTN_TOUCH, 0);
input_report_abs(dev->input, ABS_PRESSURE, 0);
atp_report_fingers(dev->input, 0);
@ -757,6 +768,10 @@ static void atp_complete_geyser_3_4(struct urb *urb)
memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
}
if (fingers != dev->fingers_old)
dev->x_old = dev->y_old = -1;
dev->fingers_old = fingers;
input_report_key(dev->input, BTN_LEFT, key);
input_sync(dev->input);