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>parport_register_driver</SPAN
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><H2
>Name</H2
>parport_register_driver -- register a parallel port device driver
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>Synopsis</H2
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><CODE
><CODE
CLASS="FUNCDEF"
>int <TT
CLASS="FUNCTION"
>parport_register_driver </TT
></CODE
>(struct parport_driver * <TT
CLASS="PARAMETER"
><I
>drv</I
></TT
>);</CODE
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>Arguments</H2
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><DL
><DT
><TT
CLASS="PARAMETER"
><I
>drv</I
></TT
></DT
><DD
><P
> structure describing the driver
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><H2
>Description</H2
><P
> This can be called by a parallel port device driver in order
to receive notifications about ports being found in the
system, as well as ports no longer available.
</P
><P
> The <TT
CLASS="PARAMETER"
><I
>drv</I
></TT
> structure is allocated by the caller and must not be
deallocated until after calling <TT
CLASS="FUNCTION"
>parport_unregister_driver</TT
>.
</P
><P
> The driver's <TT
CLASS="FUNCTION"
>attach</TT
> function may block. The port that
<TT
CLASS="FUNCTION"
>attach</TT
> is given will be valid for the duration of the
callback, but if the driver wants to take a copy of the
pointer it must call <TT
CLASS="FUNCTION"
>parport_get_port</TT
> to do so. Calling
<TT
CLASS="FUNCTION"
>parport_register_device</TT
> on that port will do this for you.
</P
><P
> The driver's <TT
CLASS="FUNCTION"
>detach</TT
> function may not block. The port that
<TT
CLASS="FUNCTION"
>detach</TT
> is given will be valid for the duration of the
callback, but if the driver wants to take a copy of the
pointer it must call <TT
CLASS="FUNCTION"
>parport_get_port</TT
> to do so.
</P
><P
> Returns 0 on success. Currently it always succeeds.
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