From: Aaron Armstrong Skomra <[email protected]>

Commit a50aac7193f1 introduces 'led.groups' and adds EKR support
for these groups. However, unlike the other devices with LEDs,
the EKR's LEDs are read-only and we shouldn't attempt to control
them in wacom_led_control().

See bug: https://sourceforge.net/p/linuxwacom/bugs/342/

Fixes: a50aac7193f1 ("backport: HID: wacom: leds: dynamically allocate LED 
groups")
Cc: stable <[email protected]>     # 4.9
Signed-off-by: Aaron Armstrong Skomra <[email protected]>
Reviewed-by: Jason Gerecke <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
[[email protected]: Imported into input-wacom repository (74aebed6dc)]
Signed-off-by: Jason Gerecke <[email protected]>
[[email protected]: Backported from input-wacom repository (7a69536)]
Signed-off-by: Jason Gerecke <[email protected]>
---
 3.17/wacom_sys.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/3.17/wacom_sys.c b/3.17/wacom_sys.c
index 2996d0d..8fd0b78 100644
--- a/3.17/wacom_sys.c
+++ b/3.17/wacom_sys.c
@@ -794,6 +794,9 @@ static int wacom_led_control(struct wacom *wacom)
        if (!wacom->led.groups)
                return -ENOTSUPP;
 
+       if (wacom->wacom_wac.features.type == REMOTE)
+               return -ENOTSUPP;
+
        if (wacom->wacom_wac.pid) { /* wireless connected */
                report_id = WAC_CMD_WL_LED_CONTROL;
                buf_size = 13;
-- 
2.14.1


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