From: Jason Gerecke jason.gerecke@wacom.com

There appear to be a few different ways that Wacom devices can deal with confidence:

1. If the device looses confidence in a touch, it will first clear the tipswitch flag in one report, and then clear the confidence flag in a second report. This behavior is used by e.g. DTH-2452.

2. If the device looses confidence in a touch, it will clear both the tipswitch and confidence flags within the same report. This behavior is used by some AES devices.

3. If the device looses confidence in a touch, it will clear *only* the confidence bit. The tipswitch bit will remain set so long as the touch is tracked. This behavior may be used in future devices.

The driver does not currently handle situation 3 properly. Touches that loose confidence will remain "in prox" and essentially frozen in place until the tipswitch bit is finally cleared. Not only does this result in userspace seeing a stuck touch, but it also prevents pen arbitration from working properly (the pen won't send events until all touches are up, but we don't currently process events from non-confident touches).

This commit centralizes the checking of the confidence bit in the wacom_wac_finger_slot() function and has 'prox' depend on it. In the case where situation 3 is encountered, the treat the touch as though it was removed, allowing both userspace and the pen arbitration to act normally.

Signed-off-by: Tatsunosuke Tobita tatsunosuke.tobita@wacom.com Signed-off-by: Ping Cheng ping.cheng@wacom.com Signed-off-by: Jason Gerecke jason.gerecke@wacom.com Fixes: 7fb0413baa7f ("HID: wacom: Use "Confidence" flag to prevent reporting invalid contacts") Cc: stable@vger.kernel.org --- drivers/hid/wacom_wac.c | 32 ++++---------------------------- 1 file changed, 4 insertions(+), 28 deletions(-)

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 471db78dbbf0..8289ce763704 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2649,8 +2649,8 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac, { struct hid_data *hid_data = &wacom_wac->hid_data; bool mt = wacom_wac->features.touch_max > 1; - bool prox = hid_data->tipswitch && - report_touch_events(wacom_wac); + bool touch_down = hid_data->tipswitch && hid_data->confidence; + bool prox = touch_down && report_touch_events(wacom_wac);

if (touch_is_muted(wacom_wac)) { if (!wacom_wac->shared->touch_down) @@ -2700,24 +2700,6 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac, } }

-static bool wacom_wac_slot_is_active(struct input_dev *dev, int key) -{ - struct input_mt *mt = dev->mt; - struct input_mt_slot *s; - - if (!mt) - return false; - - for (s = mt->slots; s != mt->slots + mt->num_slots; s++) { - if (s->key == key && - input_mt_get_value(s, ABS_MT_TRACKING_ID) >= 0) { - return true; - } - } - - return false; -} - static void wacom_wac_finger_event(struct hid_device *hdev, struct hid_field *field, struct hid_usage *usage, __s32 value) { @@ -2768,14 +2750,8 @@ static void wacom_wac_finger_event(struct hid_device *hdev, }

if (usage->usage_index + 1 == field->report_count) { - if (equivalent_usage == wacom_wac->hid_data.last_slot_field) { - bool touch_removed = wacom_wac_slot_is_active(wacom_wac->touch_input, - wacom_wac->hid_data.id) && !wacom_wac->hid_data.tipswitch; - - if (wacom_wac->hid_data.confidence || touch_removed) { - wacom_wac_finger_slot(wacom_wac, wacom_wac->touch_input); - } - } + if (equivalent_usage == wacom_wac->hid_data.last_slot_field) + wacom_wac_finger_slot(wacom_wac, wacom_wac->touch_input); } }