Currently, the driver will attempt to set the mode on all
devices with a center button, but some devices with a center
button lack LEDs, and attempting to set the LEDs on devices
without LEDs results in the kernel error message of the form:
"leds input8::wacom-0.1: Setting an LED's brightness failed (-32)"
This is because the generic codepath erroneously assumes that the
BUTTON_CENTER usage indicates that the device has LEDs, the
previously ignored TOUCH_RING_SETTING usage is a more accurate
indication of the existence of LEDs on the device.
Fixes: 10c55cacb8b2 ("HID: wacom: generic: support LEDs")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.11+
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@xxxxxxxxx>
Reviewed-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
---
drivers/hid/wacom_sys.c | 3 +++
drivers/hid/wacom_wac.c | 2 --
drivers/hid/wacom_wac.h | 1 +
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index a8633b1437b2..2e3e03df83da 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -307,6 +307,9 @@ static void wacom_feature_mapping(struct hid_device *hdev,
wacom_hid_usage_quirk(hdev, field, usage);
switch (equivalent_usage) {
+ case WACOM_HID_WD_TOUCH_RING_SETTING:
+ wacom->generic_has_leds = true;
+ break;
case HID_DG_CONTACTMAX:
/* leave touch_max as is if predefined */
if (!features->touch_max) {
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 09b8e4aac82f..10cce2ca6301 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1930,8 +1930,6 @@ static void wacom_wac_pad_usage_mapping(struct hid_device *hdev,
features->device_type |= WACOM_DEVICETYPE_PAD;
break;
case WACOM_HID_WD_BUTTONCENTER:
- wacom->generic_has_leds = true;
- /* fall through */
case WACOM_HID_WD_BUTTONHOME:
case WACOM_HID_WD_BUTTONUP:
case WACOM_HID_WD_BUTTONDOWN:
diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h
index 295fd3718caa..f67d871841c0 100644
--- a/drivers/hid/wacom_wac.h
+++ b/drivers/hid/wacom_wac.h
@@ -145,6 +145,7 @@
#define WACOM_HID_WD_OFFSETBOTTOM (WACOM_HID_UP_WACOMDIGITIZER | 0x0d33)
#define WACOM_HID_WD_DATAMODE (WACOM_HID_UP_WACOMDIGITIZER | 0x1002)
#define WACOM_HID_WD_DIGITIZERINFO (WACOM_HID_UP_WACOMDIGITIZER | 0x1013)
+#define WACOM_HID_WD_TOUCH_RING_SETTING (WACOM_HID_UP_WACOMDIGITIZER | 0x1032)
#define WACOM_HID_UP_G9 0xff090000
#define WACOM_HID_G9_PEN (WACOM_HID_UP_G9 | 0x02)
#define WACOM_HID_G9_TOUCHSCREEN (WACOM_HID_UP_G9 | 0x11)
--
2.7.4
