linux-kernel - [PATCH 4.17 67/70] HID: wacom: Correct logical maximum Y for 2nd-gen Intuos Pro large

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Message-Id: <20180624142744.673870112@linuxfoundation.org>
Date:   Sun, 24 Jun 2018 23:22:59 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jason Gerecke <jason.gerecke@...om.com>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 4.17 67/70] HID: wacom: Correct logical maximum Y for 2nd-gen Intuos Pro large

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Gerecke <killertofu@...il.com>

commit d471b6b22d37bf9928c6d0202bdaaf76583b8b61 upstream.

The HID descriptor for the 2nd-gen Intuos Pro large (PTH-860) contains
a typo which defines an incorrect logical maximum Y value. This causes
a small portion of the bottom of the tablet to become unusable (both
because the area is below the "bottom" of the tablet and because
'wacom_wac_event' ignores out-of-range values). It also results in a
skewed aspect ratio.

To fix this, we add a quirk to 'wacom_usage_mapping' which overwrites
the data with the correct value.

Signed-off-by: Jason Gerecke <jason.gerecke@...om.com>
CC: stable@...r.kernel.org # v4.10+
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/wacom_sys.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -395,6 +395,14 @@ static void wacom_usage_mapping(struct h
 		}
 	}
 
+	/* 2nd-generation Intuos Pro Large has incorrect Y maximum */
+	if (hdev->vendor == USB_VENDOR_ID_WACOM &&
+	    hdev->product == 0x0358 &&
+	    WACOM_PEN_FIELD(field) &&
+	    wacom_equivalent_usage(usage->hid) == HID_GD_Y) {
+		field->logical_maximum = 43200;
+	}
+
 	switch (usage->hid) {
 	case HID_GD_X:
 		features->x_max = field->logical_maximum;