diff options
| author | Jason Gerecke <killertofu@gmail.com> | 2017-11-10 11:50:01 -0800 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-11-21 13:04:35 +0100 |
| commit | 83417206427bdf0fef9fa69957807194f25923c3 (patch) | |
| tree | e7d1350d7acd2ddcbb116c203a5b5ad8552f033b /drivers/hid/wacom_wac.c | |
| parent | 99acedadde157a02b21761fd406ef7adc7615533 (diff) | |
HID: wacom: Queue events with missing type/serial data for later processing
Userspace expects to receive tool type and serial number information
for the active pen in the very first kernel report, if such data is
supported by the hardware. While this expectation is not an issue for
EMR devices, AES sensors will often send several packets worth of in-
range data before relaying type/serial data to the kernel. Sending this
data "late" can result in proximity-tracking issues by xf86-input-wacom,
or an inability to distinguish different pens by input-wacom.
Options for dealing with this situation include ignoring reports from
the tablet until we get the necessary data, or using the information
from the last-seen pen instead of the (eventual) real data. Neither
option is particularly attractive: the former results in truncated
strokes and the latter causes issues with switching between pens.
This commit instead opts to queue up events with missing information
until we receive a report which contains it. At that point, we can
update the driver's state variables (id[0] and serial[0]) and replay
the queued events.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/wacom_wac.c')
| -rw-r--r-- | drivers/hid/wacom_wac.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index ff679ee3b358..7fa373225d8a 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2085,6 +2085,7 @@ static void wacom_wac_pen_usage_mapping(struct hid_device *hdev, wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS2, 0); break; case HID_DG_TOOLSERIALNUMBER: + features->quirks |= WACOM_QUIRK_TOOLSERIAL; wacom_map_usage(input, usage, field, EV_MSC, MSC_SERIAL, 0); /* Adjust AES usages to match modern convention */ |