HID: Autocentering support for Logitech MOMO Racing Wheel

Current kernel has no support for autocentering for Logitech wheels. By
default autocentering enabled in wheel and constant effect does not work
properly. Using USB sniffer I found command which change autocentering
settings: 0xFE, 0x0D, 0x0R, 0x0L, 0x80, 0x00, 0x00, where R - clockwise force,
L - counter-clockwise (0x0-0xF, 0xC = 100%).

Signed-off-by: Sergey Belyashov <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-lgff.c

···
 	-1
 };
 
+static const signed short ff_wheel[] = {
+	FF_CONSTANT,
+	FF_AUTOCENTER,
+	-1
+};
+
 static const struct dev_type devices[] = {
 	{ 0x046d, 0xc211, ff_rumble },
 	{ 0x046d, 0xc219, ff_rumble },
···
 	{ 0x046d, 0xc286, ff_joystick },
 	{ 0x046d, 0xc294, ff_joystick },
 	{ 0x046d, 0xc295, ff_joystick },
-	{ 0x046d, 0xca03, ff_joystick },
+	{ 0x046d, 0xca03, ff_wheel },
 };
 
 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
···
 		break;
 	}
 	return 0;
+}
+
+static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
+{
+	struct hid_device *hid = input_get_drvdata(dev);
+	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
+	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
+	__s32 *value = report->field[0]->value;
+	magnitude = (magnitude >> 12) & 0xf;
+	*value++ = 0xfe;
+	*value++ = 0x0d;
+	*value++ = magnitude;   /* clockwise strength */
+	*value++ = magnitude;   /* counter-clockwise strength */
+	*value++ = 0x80;
+	*value++ = 0x00;
+	*value = 0x00;
+	usbhid_submit_report(hid, report, USB_DIR_OUT);
 }
 
 int lgff_init(struct hid_device* hid)
···
 	error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 	if (error)
 		return error;
+
+	if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
+		dev->ff->set_autocenter = hid_lgff_set_autocenter;
 
 	printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <[e-mail]>\n");