Re: [linux-usb-devel] Info to write a host driver on kernel 2.4.19

[David Brownell]

Sylvain Meunier wrote:

Hi,

I'm currently updating/re-writing a host driver for SL811 circuit
for kernel 2.4. I've several questions about expected works of
host driver :

Any problems with the sl811hs driver in the 2.5 kernel?  If that
doesn't work on 2.4 kernels, it should do so without much work;
it uses the old HCD structure.

4) How does work the urb->next.

Don't bother implementing this.  Device drivers can implement what they
need by (re)submitting iso urbs in the completion functions, and
that approach doesn't hide the errors that could occur. ...

PS: Is there a "How to write a host driver"  or "what is exactly the
work of host driver" :)

For now, UTSL. I like to think that the 2.5.50 ohci-hcd is small
enough that understanding it wouldn't be much of a distraction from
your real task (writing for different hardware).

Certainly look at 2.5, since there's at least the "usbtest" driver
that lets you test a lot of basic functionality required of an HCD.
(More test cases needed, of course.)

- Dave







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