[PATCH] hid: ignore digitizer usage Undefined (0x00)

[Forest Bond <forest@alittletooquiet.net>]

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SMART Technologies has recommended this change to fix a problem reported
with SMART Board series interactive whiteboards.

A description of the device-specific symptom follows:

  When the board is connected my mouse bounces up to the top left corner.

Bjorn has tested this fix with model SB680.

Tested-by: Bjorn Behrendt <bbehrendt@msjvermont.org>
Signed-off-by: Forest Bond <forest@alittletooquiet.net>
---
 drivers/hid/hid-input.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 7a0d2e4..6b10e5a 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -301,6 +301,9 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 
 	case HID_UP_DIGITIZER:
 		switch (usage->hid & 0xff) {
+		case 0x00: /* Undefined */
+			goto ignore;
+
 		case 0x30: /* TipPressure */
 			if (!test_bit(BTN_TOUCH, input->keybit)) {
 				device->quirks |= HID_QUIRK_NOTOUCH;
-- 
1.7.0.4

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