How to access a device on LPC bus?

[M. Warner Losh]

In message: <20041017115011.GA22744 at mygiea.ham01.thiemo.net>
            Thiemo Nordenholz <listmember at thiemo.net> writes:
: Hi there,
: 
: beginner's question, maybe: How do I, from a device driver point of view,
: access a device attached to the "Low Pincount" (LPC) bus? 
: 
: I have a Winbond W83L518D card reader controller in a notebook that I want
: to access. The only way I see this device at all is (on 5.3-BETA7) in
: "pnpinfo -v" output, where it shows up as 
: 
:     unknown pnpinfo _HID=WEC0518 _UID=0 at handle=\_SB_.C046.C059.C140
: 
: -- I have identified it then by the Hardware ID. I do not see any more
: information, especially no resource usage.
: 
: As far as I have read, the LPC bus devices can accessed just like ISA
: devices. Actually, what seems to be the ACPI parent of this Winbond chip
: (with handle \_SB_.C046.C059) is shown as isab0 in the devinfo output.
: 
: Now, to implement an identify function in a driver for this, I need to
: access data in the controller - but I don't have any information about its
: memory attachments... 
: Could anyone give me a hint what to do here, some driver to look into for an
: example, or just tell me that my idea of an ISA driver on fBSD is completely
: wrong?

If there's a HID, you don't need an identify routine.  Just match the
pnp id.  You can have ISA and/or ACPI attachments to cover both cases.

Warner