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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: 4922cd26f0 ("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>
This commit is contained in:
Jason Gerecke 2019-05-07 11:53:22 -07:00 committed by Benjamin Tissoires
parent 6441fc781c
commit 69dbdfffef
1 changed files with 8 additions and 2 deletions
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6
drivers/hid/wacom_wac.c
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@ -1371,13 +1371,19 @@ 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);
}
}
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)
{
struct input_dev *pad_input = wacom->pad_input;