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HID: rmi: disable dribble packets on Synaptics touchpads

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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@synaptics.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Andrew Duggan 2015-02-24 17:36:49 -08:00 committed by Jiri Kosina
parent dd8df28459
commit 05ba999fca
1 changed files with 19 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
drivers/hid/hid-rmi.c
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@ -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;
}