Two drivers sharing a single PCI device

[Hans Petter Selasky]

On 02/06/15 04:50, O'Connor, Daniel wrote:
> Hi,
> I am working on an EHCI debug driver and I have the basics working (attach, probe for a debug dongle and send data back and forth) - https://bitbucket.org/DJOConnor/dbgp
>
> However one problem remaining is that for it to work you have to detach the EHCI driver (obviously rather suboptimal :) so I am wondering what the best way would be to allow both ehci and dbgp to attach to the same PCI device.
>
> The dbgp driver doesn't touch the EHCI registers once it's running but it does have some code to start the EHCI controller and reset the port during attach.
>
> I can modify echi so it uses RF_SHAREABLE which should allow them to get newbus handles to the same area but the problem is that only one probe routine gets called.
>
> Any help appreciated, thanks.

Hi,

You possibly want "D_TRACKCLOSE" in d_flags in your cdevsw.

What's the advantage of using the debug port over the regular EHCI USB 
interface?

--HPS