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>

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 530fcd19e90e7f9033d957c10d2f734817d056fd..49f6cc0f99194e0dbb9e11d3fce9b74666eec9cf 100644 (file)
--- 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 */