[PATCH 3.12 182/212] HID:hid-lg4ff: Switch autocentering off when strength is set to zero.

[Greg Kroah-Hartman]

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

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

From: Simon Wood <simon@xxxxxxxxxxxxx>

commit d2c02da549b468bbb28e67d269bd3c9e10683ff5 upstream.

When the autocenter is set to zero, this patch issues a command to
totally disable the autocenter - this results in less resistance
in the wheel.

Reported-by: Elias Vanderstuyft <elias.vds@xxxxxxxxx>
Signed-off-by: Simon Wood <simon@xxxxxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/hid/hid-lg4ff.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -220,6 +220,20 @@ static void hid_lg4ff_set_autocenter_def
 	__s32 *value = report->field[0]->value;
 	__u32 expand_a, expand_b;
 
+	/* De-activate Auto-Center */
+	if (magnitude == 0) {
+		value[0] = 0xf5;
+		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;
+	}
+
 	if (magnitude <= 0xaaaa) {
 		expand_a = 0x0c * magnitude;
 		expand_b = 0x80 * magnitude;
@@ -236,6 +250,17 @@ static void hid_lg4ff_set_autocenter_def
 	value[5] = 0x00;
 	value[6] = 0x00;
 
+	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+
+	/* Activate Auto-Center */
+	value[0] = 0x14;
+	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);
 }
 


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