Re: [PATCH] Autocentering support for Logitech MOMO Racing Wheel (force feedback)

["Сергей Беляшов" <Sergey.Belyashov@gmail.com>]

Jiri Kosina пишет:
> On Mon, 18 Aug 2008, Sergey Belyashov wrote:
> 
>> =========================================================================
>> Logitech MOMO Recing Wheel Force Feedback autocenter setting support
>> (also may be work on G25 etc. but I cann't check):
> 
> Hi Sergey,
> 
> sorry for late reply, I have been on vacation.
> 
> Could you please send the patch with proper Signed-off-by: line, as 
> documented in Documentation/SubmittingPatches, so that I can merge it 
> properly?
> 
> Thanks!
> 

  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%). I write patch for my current kernel (2.6.25), but I think git
version also supported, because I do not found any changes in it.


========================================================================================
--- drivers/hid/usbhid/hid-lgff.c	2008-04-17 06:49:44.000000000 +0400
+++ drivers/hid/usbhid/hid-lgff.c	2008-08-19 20:57:00.000000000 +0400
@@ -48,6 +48,12 @@ static const signed short ff_joystick[] 
 	-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 },
@@ -55,7 +61,7 @@ static const struct dev_type devices[] =
 	{ 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)
@@ -100,6 +106,23 @@ static int hid_lgff_play(struct input_de
 	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 hid_lgff_init(struct hid_device* hid)
 {
 	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
@@ -145,6 +168,9 @@ int hid_lgff_init(struct hid_device* hid
 	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 <johann.deneux@it.uu.se>\n");
 
 	return 0;

========================================================================================
Signed-off-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
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