HID: wacom: correct misreported EKR ring values

BugLink: https://bugs.launchpad.net/bugs/1842114
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@wacom.com>
Fixes: 72b236d60218f ("HID: wacom: Add support for Express Key Remote.")
Cc: <stable@vger.kernel.org> # v4.3+
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 4c515a61cdbe452f8aa03419ab52b8b8a09044d1..bb69203924657951b87c1ba26d929e4db106d9e6 100644 (file)
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1061,7 +1061,7 @@ static int wacom_remote_irq(struct wacom_wac *wacom_wac, size_t len)
        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);