HID:hid-lg4ff: ensure ConstantForce is disabled when set to 0

When 'Constant Force' is set to 0 it is not turned off completely,
the wheel feels 'heavy'. This patch issues the '13 00..' command
to ensure that the force in slot 1 (the Constant Force) is
deactivated.

Reported-by: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 49f6cc0f99194e0dbb9e11d3fce9b74666eec9cf..5d140b7a450a6891d08da91e669761c2836e7342 100644 (file)
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -196,6 +196,21 @@ static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *e
        case FF_CONSTANT:
                x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
                CLAMP(x);
+
+               if (x == 0x80) {
+                       /* De-activate force in slot-1*/
+                       value[0] = 0x13;
+                       value[1] = 0x00;
+                       value[2] = 0x00;
+                       value[3] = 0x00;
+                       value[4] = 0x00;
+                       value[5] = 0x00;
+                       value[6] = 0x00;
+
+                       hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+                       return 0;
+               }
+
                value[0] = 0x11;        /* Slot 1 */
                value[1] = 0x08;
                value[2] = x;