Getting into USB drivers
blubee blubeeme
gurenchan at gmail.com
Fri Oct 27 02:18:55 UTC 2017
I have a USB webcam that I would like to get into writing drivers for as a
practical introduction to writing drivers for FreeBSD. I am not sure if
this one already has a driver but here's the usb dump of the device.
Anyone here willing to give me some pointers on writing drivers?
me at blubee:~ % sudo usbconfig -d 0.5 dump_all_config_desc
Password:
ugen0.5: <SunplusIT Inc Chicony USB 2.0 Camera> at usbus0, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON (500mA)
Configuration index 0
bLength = 0x0009
bDescriptorType = 0x0002
wTotalLength = 0x03a9
bNumInterfaces = 0x0002
bConfigurationValue = 0x0001
iConfiguration = 0x0000 <no string>
bmAttributes = 0x0080
bMaxPower = 0x00fa
Additional Descriptor
bLength = 0x08
bDescriptorType = 0x0b
bDescriptorSubType = 0x00
RAW dump:
0x00 | 0x08, 0x0b, 0x00, 0x02, 0x0e, 0x03, 0x00, 0x04
Interface 0
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0000
bAlternateSetting = 0x0000
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0001
bInterfaceProtocol = 0x0000
iInterface = 0x0004 <Chicony USB 2.0 Camera>
Additional Descriptor
bLength = 0x0d
bDescriptorType = 0x24
bDescriptorSubType = 0x01
RAW dump:
0x00 | 0x0d, 0x24, 0x01, 0x00, 0x01, 0x6d, 0x00, 0x00,
0x08 | 0x6c, 0xdc, 0x02, 0x01, 0x01
Additional Descriptor
bLength = 0x12
bDescriptorType = 0x24
bDescriptorSubType = 0x02
RAW dump:
0x00 | 0x12, 0x24, 0x02, 0x01, 0x01, 0x02, 0x00, 0x00,
0x08 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x0e,
0x10 | 0x00, 0x00
Additional Descriptor
bLength = 0x0b
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x0b, 0x24, 0x05, 0x02, 0x01, 0x00, 0x40, 0x02,
0x08 | 0x7f, 0x15, 0x00
Additional Descriptor
bLength = 0x1d
bDescriptorType = 0x24
bDescriptorSubType = 0x06
RAW dump:
0x00 | 0x1d, 0x24, 0x06, 0x03, 0xc3, 0x85, 0xb8, 0x0f,
0x08 | 0xc2, 0x68, 0x47, 0x45, 0x90, 0xf7, 0x8f, 0x47,
0x10 | 0x57, 0x9d, 0x95, 0xfc, 0x00, 0x01, 0x02, 0x04,
0x18 | 0x1f, 0x00, 0x00, 0x00, 0x00
Additional Descriptor
bLength = 0x1d
bDescriptorType = 0x24
bDescriptorSubType = 0x06
RAW dump:
0x00 | 0x1d, 0x24, 0x06, 0x04, 0x82, 0x06, 0x61, 0x63,
0x08 | 0x70, 0x50, 0xab, 0x49, 0xb8, 0xcc, 0xb3, 0x85,
0x10 | 0x5e, 0x8d, 0x22, 0x1d, 0x00, 0x01, 0x03, 0x04,
0x18 | 0xff, 0xff, 0x71, 0x00, 0x00
Additional Descriptor
bLength = 0x09
bDescriptorType = 0x24
bDescriptorSubType = 0x03
RAW dump:
0x00 | 0x09, 0x24, 0x03, 0x05, 0x01, 0x01, 0x00, 0x04,
0x08 | 0x00
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0087 <IN>
bmAttributes = 0x0003 <INTERRUPT>
wMaxPacketSize = 0x0010
bInterval = 0x0008
bRefresh = 0x0000
bSynchAddress = 0x0000
Additional Descriptor
bLength = 0x05
bDescriptorType = 0x25
bDescriptorSubType = 0x03
RAW dump:
0x00 | 0x05, 0x25, 0x03, 0x05, 0x04
Interface 1
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0000
bNumEndpoints = 0x0000
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Additional Descriptor
bLength = 0x0f
bDescriptorType = 0x24
bDescriptorSubType = 0x01
RAW dump:
0x00 | 0x0f, 0x24, 0x01, 0x02, 0x5d, 0x02, 0x81, 0x00,
0x08 | 0x05, 0x01, 0x01, 0x00, 0x01, 0x04, 0x00
Additional Descriptor
bLength = 0x0b
bDescriptorType = 0x24
bDescriptorSubType = 0x06
RAW dump:
0x00 | 0x0b, 0x24, 0x06, 0x01, 0x09, 0x01, 0x01, 0x00,
0x08 | 0x00, 0x00, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x01, 0x01, 0x80, 0x07, 0x38,
0x08 | 0x04, 0x00, 0x80, 0x53, 0x3b, 0x00, 0x80, 0x53,
0x10 | 0x3b, 0x00, 0x48, 0x3f, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x02, 0x01, 0xa0, 0x00, 0x78,
0x08 | 0x00, 0x00, 0xa0, 0x8c, 0x00, 0x00, 0xa0, 0x8c,
0x10 | 0x00, 0x00, 0x96, 0x00, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x03, 0x01, 0xb0, 0x00, 0x90,
0x08 | 0x00, 0x00, 0xa0, 0xb9, 0x00, 0x00, 0xa0, 0xb9,
0x10 | 0x00, 0x00, 0xc6, 0x00, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x04, 0x01, 0x40, 0x01, 0xf0,
0x08 | 0x00, 0x00, 0x80, 0x32, 0x02, 0x00, 0x80, 0x32,
0x10 | 0x02, 0x00, 0x58, 0x02, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x05, 0x01, 0x60, 0x01, 0x20,
0x08 | 0x01, 0x00, 0x80, 0xe6, 0x02, 0x00, 0x80, 0xe6,
0x10 | 0x02, 0x00, 0x18, 0x03, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x06, 0x01, 0x80, 0x02, 0x68,
0x08 | 0x01, 0x00, 0x80, 0x97, 0x06, 0x00, 0x80, 0x97,
0x10 | 0x06, 0x00, 0x08, 0x07, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x07, 0x01, 0x80, 0x02, 0xe0,
0x08 | 0x01, 0x00, 0x00, 0xca, 0x08, 0x00, 0x00, 0xca,
0x10 | 0x08, 0x00, 0x60, 0x09, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x08, 0x01, 0x00, 0x05, 0xd0,
0x08 | 0x02, 0x00, 0x00, 0x5e, 0x1a, 0x00, 0x00, 0x5e,
0x10 | 0x1a, 0x00, 0x20, 0x1c, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x07
RAW dump:
0x00 | 0x1e, 0x24, 0x07, 0x09, 0x01, 0x00, 0x05, 0x00,
0x08 | 0x04, 0x00, 0x00, 0x80, 0x25, 0x00, 0x00, 0x80,
0x10 | 0x25, 0x00, 0x00, 0x28, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x06
bDescriptorType = 0x24
bDescriptorSubType = 0x0d
RAW dump:
0x00 | 0x06, 0x24, 0x0d, 0x01, 0x01, 0x04
Additional Descriptor
bLength = 0x1b
bDescriptorType = 0x24
bDescriptorSubType = 0x04
RAW dump:
0x00 | 0x1b, 0x24, 0x04, 0x02, 0x09, 0x59, 0x55, 0x59,
0x08 | 0x32, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00,
0x10 | 0xaa, 0x00, 0x38, 0x9b, 0x71, 0x10, 0x01, 0x00,
0x18 | 0x00, 0x00, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x01, 0x01, 0x80, 0x07, 0x38,
0x08 | 0x04, 0x00, 0x40, 0xe3, 0x09, 0x00, 0x40, 0xe3,
0x10 | 0x09, 0x00, 0x48, 0x3f, 0x00, 0x80, 0x84, 0x1e,
0x18 | 0x00, 0x01, 0x80, 0x84, 0x1e, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x02, 0x01, 0xa0, 0x00, 0x78,
0x08 | 0x00, 0x00, 0xa0, 0x8c, 0x00, 0x00, 0xa0, 0x8c,
0x10 | 0x00, 0x00, 0x96, 0x00, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x03, 0x01, 0xb0, 0x00, 0x90,
0x08 | 0x00, 0x00, 0xa0, 0xb9, 0x00, 0x00, 0xa0, 0xb9,
0x10 | 0x00, 0x00, 0xc6, 0x00, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x04, 0x01, 0x40, 0x01, 0xf0,
0x08 | 0x00, 0x00, 0x80, 0x32, 0x02, 0x00, 0x80, 0x32,
0x10 | 0x02, 0x00, 0x58, 0x02, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x05, 0x01, 0x60, 0x01, 0x20,
0x08 | 0x01, 0x00, 0x80, 0xe6, 0x02, 0x00, 0x80, 0xe6,
0x10 | 0x02, 0x00, 0x18, 0x03, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x06, 0x01, 0x80, 0x02, 0x68,
0x08 | 0x01, 0x00, 0x80, 0x97, 0x06, 0x00, 0x80, 0x97,
0x10 | 0x06, 0x00, 0x08, 0x07, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x07, 0x01, 0x80, 0x02, 0xe0,
0x08 | 0x01, 0x00, 0x00, 0xca, 0x08, 0x00, 0x00, 0xca,
0x10 | 0x08, 0x00, 0x60, 0x09, 0x00, 0x15, 0x16, 0x05,
0x18 | 0x00, 0x01, 0x15, 0x16, 0x05, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x08, 0x01, 0x00, 0x05, 0xd0,
0x08 | 0x02, 0x00, 0x00, 0xca, 0x08, 0x00, 0x00, 0xca,
0x10 | 0x08, 0x00, 0x20, 0x1c, 0x00, 0x40, 0x42, 0x0f,
0x18 | 0x00, 0x01, 0x40, 0x42, 0x0f, 0x00
Additional Descriptor
bLength = 0x1e
bDescriptorType = 0x24
bDescriptorSubType = 0x05
RAW dump:
0x00 | 0x1e, 0x24, 0x05, 0x09, 0x01, 0x00, 0x05, 0x00,
0x08 | 0x04, 0x00, 0x00, 0x40, 0x06, 0x00, 0x00, 0x40,
0x10 | 0x06, 0x00, 0x00, 0x28, 0x00, 0x80, 0x84, 0x1e,
0x18 | 0x00, 0x01, 0x80, 0x84, 0x1e, 0x00
Additional Descriptor
bLength = 0x06
bDescriptorType = 0x24
bDescriptorSubType = 0x0d
RAW dump:
0x00 | 0x06, 0x24, 0x0d, 0x01, 0x01, 0x04
Interface 1 Alt 1
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0001
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x00c0
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 2
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0002
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0180
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 3
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0003
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0200
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 4
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0004
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0280
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 5
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0005
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0320
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 6
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0006
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x03b0
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 7
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0007
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0a80
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 8
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0008
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0b20
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 9
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0009
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x0be0
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 10
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x000a
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x13c0
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1 Alt 11
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x000b
bNumEndpoints = 0x0001
bInterfaceClass = 0x000e <Video device>
bInterfaceSubClass = 0x0002
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0005 <ASYNC-ISOCHRONOUS>
wMaxPacketSize = 0x13fc
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
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