[PATCH 4.19 236/271] HID: wacom: generic: only switch the mode on devices with LEDs

[Greg Kroah-Hartman]

From: Aaron Armstrong Skomra <skomra@xxxxxxxxx>

commit d8e9806005f28bbb49899dab2068e3359e22ba35 upstream.

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>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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(-)

--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -275,6 +275,9 @@ static void wacom_feature_mapping(struct
 	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) {
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1928,8 +1928,6 @@ static void wacom_wac_pad_usage_mapping(
 		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:
--- 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)