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HID: wacom: Sync INTUOSP2_BT touch state after each frame if necessary
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The Bluetooth interface of the 2nd-gen Intuos Pro batches together four
independent "frames" of finger data into a single report. Each frame
is essentially equivalent to a single USB report, with the up-to-10
fingers worth of information being spread across two frames. At the
moment the driver only calls `input_sync` after processing all four
frames have been processed, which can result in the driver sending
multiple updates for a single slot within the same SYN_REPORT. This
can confuse userspace, so modify the driver to sync more often if
necessary (i.e., after reporting the state of all fingers).

Fixes: 4922cd2 ("HID: wacom: Support 2nd-gen Intuos Pro's Bluetooth classic interface")
Cc: <stable@vger.kernel.org> # 4.11+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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jigpu authored and bentiss committed May 17, 2019
1 parent 6441fc7 commit 69dbdff
Showing 1 changed file with 8 additions and 2 deletions.
10 changes: 8 additions & 2 deletions drivers/hid/wacom_wac.c
Original file line number Diff line number Diff line change
Expand Up @@ -1371,11 +1371,17 @@ static void wacom_intuos_pro2_bt_touch(struct wacom_wac *wacom)
if (wacom->num_contacts_left <= 0) {
wacom->num_contacts_left = 0;
wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);
input_sync(touch_input);
}
}

input_report_switch(touch_input, SW_MUTE_DEVICE, !(data[281] >> 7));
input_sync(touch_input);
if (wacom->num_contacts_left == 0) {
// Be careful that we don't accidentally call input_sync with
// only a partial set of fingers of processed
input_report_switch(touch_input, SW_MUTE_DEVICE, !(data[281] >> 7));
input_sync(touch_input);
}

}

static void wacom_intuos_pro2_bt_pad(struct wacom_wac *wacom)
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