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>The Linux 2.4 Parallel Port Subsystem</TH
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> The Linux 2.2 Parallel Port Subsystem
</H1
><P
> Although the interface described in this document is largely new
with the 2.4 kernel, the sharing mechanism is available in the 2.2
kernel as well. The functions available in 2.2 are:
</P
><P
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><UL
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_register_device</TT
>
</P
></LI
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_unregister_device</TT
>
</P
></LI
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_claim</TT
>
</P
></LI
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_claim_or_block</TT
>
</P
></LI
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_release</TT
>
</P
></LI
><LI
><P
> <TT
CLASS="FUNCTION"
>parport_yield</TT
>
</P
></LI
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><P
> <TT
CLASS="FUNCTION"
>parport_yield_blocking</TT
>
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><P
> In addition, negotiation to reverse nibble mode is supported:
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><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <TT
CLASS="FUNCTION"
>parport_ieee1284_nibble_mode_ok</TT
></CODE
>(struct parport *<TT
CLASS="PARAMETER"
><I
>port</I
></TT
>, unsigned char <TT
CLASS="PARAMETER"
><I
>mode</I
></TT
>);</CODE
></P
><P
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><P
> The only valid values for <TT
CLASS="PARAMETER"
><I
>mode</I
></TT
> are 0 (for
reverse nibble mode) and 4 (for Device ID in reverse nibble mode).
</P
><P
> This function is obsoleted by
<TT
CLASS="FUNCTION"
>parport_negotiate</TT
> in Linux 2.4, and has been
removed.
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