Re: How to access a device on LPC bus?

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 10/19/04

  • Next message: Thiemo Nordenholz: "Re: (solved) How to access a device on LPC bus?" 
    Date: Mon, 18 Oct 2004 23:16:06 -0600 (MDT)
To: listmember@thiemo.net

    In message: <20041017115011.GA22744@mygiea.ham01.thiemo.net>
                Thiemo Nordenholz <listmember@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
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