HID:hid-lg4ff: Switch autocentering off when strength is set to zero.

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

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 530fcd19e90e..49f6cc0f9919 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -220,6 +220,20 @@ static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitud
         __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;
@@ -237,6 +251,17 @@ static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitud
         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);
 }
 
 /* Sends autocentering command compatible with Formula Force EX */