G27 PS3

This is a reverse engineering of the USB interface of the G27 when connected to a PS3.

Enumeration

Device descriptor

bLength	18
bDescriptorType	DEVICE (0x01)
bcdUSB	2.00 (0x0200)
bDeviceClass	Defined in Interface (0x00)
bDeviceSubClass	Defined in Interface (0x00)
bDeviceProtocol	Defined in Interface (0x00)
bMaxPacketSize0	16
idVendor	0x046d
idProduct	0xc294
bcdDevice	12.38 (0x1238)
iManufacturer	None (0)
iProduct	Not Requested (2)
iSerialNumber	None (0)
bNumConfigurations	1

Configuration descriptor

Configuration Descriptor

bLength	9
bDescriptorType	CONFIGURATION (0x02)
wTotalLength	41
bNumInterfaces	1
bConfigurationValue	1
iConfiguration	None (0)
bmAttributes.Reserved	0
bmAttributes.RemoteWakeup	RemoteWakeup Not Supported (0b0)
bmAttributes.SelfPowered	Bus Powered (0b0)
bMaxPower	98mA (0x31)

Interface Descriptor

bLength	9
bDescriptorType	INTERFACE (0x04)
bInterfaceNumber	0
bAlternateSetting	0
bNumEndpoints	2
bInterfaceClass	Human Interface Device (0x03)
bInterfaceSubClass	None (0x00)
bInterfaceProtocol	None (0x00)
iInterface	None (0)

HID Descriptor

bLength 9

bDescriptorType	HID(33)
bcdHID	1.00 (0x0100)
bCountryCode	0x21
bNumDescriptors	1
bDescriptorType	REPORT (34)
wDescriptorLength	130

Endpoint Descriptor

bLength	7
bDescriptorType	ENDPOINT (0x05)
bEndpointAddress	1 IN (0b10000001)
bmAttributes.TransferType	Interrupt (0b11)
wMaxPacketSize.PacketSize	8
wMaxPacketSize.Transactions	One transaction per microframe if HS (0b00)
bInterval	10

Endpoint Descriptor

bLength	7
bDescriptorType	ENDPOINT (0x05)
bEndpointAddress	1 OUT (0b00000001)
bmAttributes.TransferType	Interrupt (0b11)
wMaxPacketSize.PacketSize	8
wMaxPacketSize.Transactions	One transaction per microframe if HS (0b00)
bInterval	10

Report descriptor

05 01 09 04 A1 01 A1 02 95 01 75 0A 15 00 26 FF 03 35 00 46 FF 03 09 30 81 02 95 0C 75 01 25 01 45 01 05 09 19 01 29 0C 81 02 95 02 06 00 FF 09 01 81 02 05 01 09 31 26 FF 00 46 FF 00 95 01 75 08 81 02 25 07 46 3B 01 75 04 65 14 09 39 81 42 75 01 95 04 65 00 06 00 FF 09 01 25 01 45 01 81 02 95 02 75 08 26 FF 00 46 FF 00 09 02 81 02 C0 A1 02 26 FF 00 46 FF 00 95 07 75 08 09 03 91 02 C0 C0

Usage Page Generic Desktop Controls (0x01) Usage Joystick (0x04) Collection Application (0x01) Collection Logical (0x02) Report Count 1 Report Size 10 Logical Minimum 0 Logical Maximum 1023 Physical Minimum 0 Physical Maximum 1023 Usage X (0x30) Input Data (0x02) Report Count 12 Report Size 1 Logical Maximum 1 Physical Maximum 1 Usage Page Button (0x09) Usage Minimum Button 1 (primary/trigger) (0x01) Usage Maximum Button 12 (0x0c) Input Data (0x02) Report Count 2 Usage Page Vendor-defined (0xff00) Usage Undefined (0x01) Input Data (0x02) Usage Page Generic Desktop Controls (0x01) Usage Y (0x31) Logical Maximum 255 Physical Maximum 255 Report Count 1 Report Size 8 Input Data (0x02) Logical Maximum 7 Physical Maximum 315 Report Size 4 Unit 20 Usage Hat switch (0x39) Input Data (0x42) Report Size 1 Report Count 4 Unit 0 Usage Page Vendor-defined (0xff00) Usage Undefined (0x01) Logical Maximum 1 Physical Maximum 1 Input Data (0x02) Report Count 2 Report Size 8 Logical Maximum 255 Physical Maximum 255 Usage Undefined (0x02) Input Data (0x02) End Collection Collection Logical (0x02) Logical Maximum 255 Physical Maximum 255 Report Count 7 Report Size 8 Usage Undefined (0x03) Output Data (0x02) End Collection End Collection

Interrupt IN report

byte index	bit 7	bit 6	bit 5	bit 4	bit 3	bit 2	bit 1	bit 0
[0]	Wheel axis LSB (unsigned, min = 0, max = 0x03ff, center = 0x0200)
[1]	left shift (l1)	right shift (r1)	triangle (up)	circle (right)	rectangle (down)	cross (left)	Wheel axis MSB
[2]	1	0	top-mid-bottom right	top-mid-bottom left	oxoo select	ooxo start	ooox r3	xooo l3
[3]	pedals (signed, center = 0x7f)
[4]	1	0	0	0	hat switch (D-Pad, Released=8, N=0, NE=1, E=2, SE=3, S=4, SW=5, W=6, NW=7)
[5-6]	0xffff

Interrupt OUT reports

TODO