Getting into USB drivers
Farhan Khan
khanzf at gmail.com
Fri Oct 27 03:18:09 UTC 2017
Hi!
I am working with on a PCIe driver, but I've done a bit of reading on
USB drivers on Linux, and its probably not too different from BSD.
Chapter 9 of the Architecture Handbook is a good start. The usb(4) man
page is pretty solid, it gets into the data structures and API calls. In
my opinion though, man pages don't make any sense unless you already
have a sense of what you are doing, so I would also read a few sample
drivers that are out there. There's an excellent book called "FreeBSD
Device Drivers: A Guide for the Intrepid" that helps to bring everything
together. It has sample drivers and builds you into things slowly.
Though a different OS, the Linux documentation is pretty good. One
article that helped me was this:
http://matthias.vallentin.net/blog/2007/04/writing-a-linux-kernel-driver-for-an-unknown-usb-device/
and Linux's drivers/usb/usb-skeleton.c sample driver.
That looks like a laptop camera, right? I think I used to have it. Would
be great if you got it over!
On 10/26/2017 10:18 PM, blubee blubeeme wrote:
> 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
>
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>
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>
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> bSynchAddress = 0x0000
>
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> RAW dump:
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>
>
>
> Interface 1
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> bAlternateSetting = 0x0000
> bNumEndpoints = 0x0000
> bInterfaceClass = 0x000e <Video device>
> bInterfaceSubClass = 0x0002
> bInterfaceProtocol = 0x0000
> iInterface = 0x0000 <no string>
>
> Additional Descriptor
>
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>
>
>
> 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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