linux-kernel - [PATCH 4.9 28/83] HID: wacom: correct misreported EKR ring values

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Message-Id: <20190904175306.399304918@linuxfoundation.org>
Date:   Wed,  4 Sep 2019 19:53:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Aaron Armstrong Skomra <aaron.skomra@...om.com>,
        Ping Cheng <ping.cheng@...om.com>,
        Jason Gerecke <jason.gerecke@...om.com>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 4.9 28/83] HID: wacom: correct misreported EKR ring values

From: Aaron Armstrong Skomra <skomra@...il.com>

commit fcf887e7caaa813eea821d11bf2b7619a37df37a upstream.

The EKR ring claims a range of 0 to 71 but actually reports
values 1 to 72. The ring is used in relative mode so this
change should not affect users.

Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@...om.com>
Fixes: 72b236d60218f ("HID: wacom: Add support for Express Key Remote.")
Cc: <stable@...r.kernel.org> # v4.3+
Reviewed-by: Ping Cheng <ping.cheng@...om.com>
Reviewed-by: Jason Gerecke <jason.gerecke@...om.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/wacom_wac.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -819,7 +819,7 @@ static int wacom_remote_irq(struct wacom
 	input_report_key(input, BTN_BASE2, (data[11] & 0x02));
 
 	if (data[12] & 0x80)
-		input_report_abs(input, ABS_WHEEL, (data[12] & 0x7f));
+		input_report_abs(input, ABS_WHEEL, (data[12] & 0x7f) - 1);
 	else
 		input_report_abs(input, ABS_WHEEL, 0);