When a finger is lifted from a Synaptics touchpad the firmware will continue
to interrupts for up to a second. These additional interrupts are know and
dribble interrupts. Since the data read from the touchpad does not change
the input subsystem only reports a single event. This makes the servicing of
dribble interrupts on Linux unnecessary. This patch simply disables dribble
interupts when configuring the touchpad.
Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
---
drivers/hid/hid-rmi.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index e2a43a1..6e74eae 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -751,6 +751,7 @@ static int rmi_populate_f11(struct hid_device *hdev)
bool has_gestures;
bool has_rel;
bool has_data40 = false;
+ bool has_dribble = false;
unsigned x_size, y_size;
u16 query_offset;
@@ -792,6 +793,14 @@ static int rmi_populate_f11(struct hid_device *hdev)
has_rel = !!(buf[0] & BIT(3));
has_gestures = !!(buf[0] & BIT(5));
+ ret = rmi_read(hdev, data->f11.query_base_addr + 5, buf);
+ if (ret) {
+ hid_err(hdev, "can not get absolute data sources: %d.\n", ret);
+ return ret;
+ }
+
+ has_dribble = !!(buf[0] & BIT(4));
+
/*
* At least 4 queries are guaranteed to be present in F11
* +1 for query 5 which is present since absolute events are
@@ -908,6 +917,16 @@ static int rmi_populate_f11(struct hid_device *hdev)
data->max_x = buf[6] | (buf[7] << 8);
data->max_y = buf[8] | (buf[9] << 8);
+ if (has_dribble) {
+ buf[0] = buf[0] & ~BIT(6);
+ ret = rmi_write(hdev, data->f11.control_base_addr, buf);
+ if (ret) {
+ hid_err(hdev, "can not write to control reg 0: %d.\n",
+ ret);
+ return ret;
+ }
+ }
+
return 0;
}
--
2.1.0
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