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Subject[Fwd: Re: [PATCH 1/3] hid: Add report descriptor for Logitech Driving Force wheel]
From
Resending as I missed adding linux-input to the receiptants,
Simon

---------------------------- Original Message ----------------------------
Subject: Re: [PATCH 1/3] hid: Add report descriptor for Logitech Driving
Force wheel
From: simon@mungewell.org
Date: Sun, February 3, 2013 8:30 pm
To: "Paul Sbarra" <sbarra.paul@gmail.com>
Cc: simon@mungewell.org
--------------------------------------------------------------------------

>> Interesting, I hadn't realized the newer models were also reporting with
> that product id. I suppose that's going to add some complexity, but at
> least the background helps explain that chunk of code.
>
>
>> So a couple of questions:
>> 1) Are you sure you have a "Driving Force"?
>
> Yes.

There is another detail which 'we' previously decided; that when a 900
degree wheel was left in simple (1st connect) mode we would leave the
acc/brake combined.

This would happen if 'lg4ff' was not enabled, or the wheel was not
recognized for the 'special' command. (Note the special command causes the
wheel rotation to be unlocked to the full 900 degrees).

This obviously is not appropriate for your wheel and patching the report
descriptor will need to be done. I'd just like to ensure that we're not
breaking another wheel in the process.

Rather than using just the USBID and the size, can we also check the BCD
revision number before patching the report descriptor - similar to what we
do in lg4ff to decide what magic command to use?
ie.
--
udesc = &(hid_to_usb_dev(hid)->descriptor);
bcdDevice = le16_to_cpu(udesc->bcdDevice);
rev_maj = bcdDevice >> 8;
rev_min = bcdDevice & 0xff;
--

I've attached the report descriptor and lsusb for the DFP and DFW, which
both show a combine acc/brake in this mode. I won't have access to my G27
till midweek.

Q. In 'simple' mode should all wheels present a seperate acc and brake
(when they can)?

My DFW wheel is broken, so I can't test patching that descriptor... but if
anyone else has this wheel I can provide code to test.

>
> 2) Does the ForceFeedback work for you?
>>
>
> I'm unsure of the best way to test FF

Since we are using 'ffmemless' we're limited to constant force, although
other modes are know. It'll be a lot of work to move away from ffmemless,
for not much gain and I suspect very few games support the other modes.

You can confirm operation with 'ffcfstress'.

Cheers,
Simon.
Bus 003 Device 004: ID 046d:c294 Logitech, Inc. Driving Force
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0xc294 Driving Force
bcdDevice 22.01
iManufacturer 0
iProduct 2 PS3/USB Cordless Wheel
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 56mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 137
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0007 1x 7 bytes
bInterval 2
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0007 1x 7 bytes
bInterval 2
Device Status: 0x0000
(Bus Powered)00000000 05 01 09 04 a1 01 a1 02 95 01 75 0a 15 00 26 ff |..........u...&.|
00000010 03 35 00 46 ff 03 09 30 81 02 95 0c 75 01 25 01 |.5.F...0....u.%.|
00000020 45 01 05 09 19 01 29 0c 81 02 95 02 06 00 ff 09 |E.....).........|
00000030 01 81 02 05 01 09 31 26 ff 00 46 ff 00 95 01 75 |......1&..F....u|
00000040 08 81 02 25 07 46 3b 01 75 04 65 14 09 39 81 42 |...%.F;.u.e..9.B|
00000050 75 01 95 04 65 00 06 00 ff 09 01 25 01 45 01 81 |u...e......%.E..|
00000060 02 95 02 75 08 26 ff 00 46 ff 00 09 02 81 02 c0 |...u.&..F.......|
00000070 a1 02 26 ff 00 46 ff 00 95 07 75 08 09 03 91 02 |..&..F....u.....|
00000080 c0 0a ff ff 95 08 b1 02 c0 |.........|
00000089Driver version is 2.1.0.
Joystick (PS3/USB Cordless Wheel) has 4 axes (X, Y, Hat0X, Hat0Y)
and 12 buttons (Trigger, ThumbBtn, ThumbBtn2, TopBtn, TopBtn2, PinkieBtn, BaseBtn, BaseBtn2, BaseBtn3, BaseBtn4, BaseBtn5, BaseBtn6).
Testing ... (interrupt to exit)
Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0:-32767 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0:-32767 1:-32767 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0:-32767 1:-32767 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0:-32767 1:-32767 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1:-32767 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off Axes: 0: 0 1: 0 2: 0 3: 0 Buttons: 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off 8:off 9:off 10:off 11:off 00000000 05 01 09 04 a1 01 a1 02 95 01 75 0a 15 00 26 ff |..........u...&.|
00000010 03 35 00 46 ff 03 09 30 81 02 95 0c 75 01 25 01 |.5.F...0....u.%.|
00000020 45 01 05 09 19 01 29 0c 81 02 95 02 06 00 ff 09 |E.....).........|
00000030 01 81 02 05 01 09 31 26 ff 00 46 ff 00 95 01 75 |......1&..F....u|
00000040 08 81 02 25 07 46 3b 01 75 04 65 14 09 39 81 42 |...%.F;.u.e..9.B|
00000050 75 01 95 04 65 00 06 00 ff 09 01 25 01 45 01 81 |u...e......%.E..|
00000060 02 95 02 75 08 26 ff 00 46 ff 00 09 02 81 02 c0 |...u.&..F.......|
00000070 a1 02 26 ff 00 46 ff 00 95 07 75 08 09 03 91 02 |..&..F....u.....|
00000080 c0 c0 |..|
00000082Bus 003 Device 004: ID 046d:c294 Logitech, Inc. Driving Force
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0xc294 Driving Force
bcdDevice 11.06
iManufacturer 3 Logitech
iProduct 1 Logitech Driving Force
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 80mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 33 US
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 130
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Device Status: 0x0001
Self Powered
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