[Linux-parport] Re: Linux-parport Digest, Vol 11, Issue 4

[Amith]

linux-parport-request at lists.infradead.org wrote:
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> Today's Topics:
> 
>    1. Re: PPCLAIM ? (stef)
>    2. HP CD Writer 7500 Plus e (Tom Lindberg)
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 4 Oct 2004 21:42:10 +0200
> From: stef <stef-listes at wanadoo.fr>
> Subject: Re: [Linux-parport] PPCLAIM ?
> To: linux-parport at lists.infradead.org
> Message-ID: <20041004194210.GA2511 at wanadoo.fr>
> Content-Type: text/plain; charset=us-ascii
> 
> On Sun, Oct 03, 2004 at 03:36:54PM +0530, Amith wrote:
> >
> >
> > hi all,
> >             when i open /dev/parport0 using open() system call, i get a valid file descriptor, but when i try to claim
> > the port (using PPCLAIM - ioctl(fd, PPCLAIM) )  i get  , "no such deivice or address" - returned by perror .
> >
> > Any idea's why ?
> >
> > cheers,
> > Amith
> >
> > PS: I was refering to Linux 2.4 Parallel Port sub system - available on the net.
> >
> > _______________________________________________
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> > http://lists.infradead.org/mailman/listinfo/linux-parport
> 
>         Hello,
> 
>         it's an known issue. There is a would-be fix, see:
> http://cyberelk.net/tim/parport/archive/current/5756.html
> 
> Regards,
>         Stef
> 
> ------------------------------

thanks Stef, i'am planning to write a driver for my printer ( user space driver ) could someone point me to where i
should start ? i have read the Linux - 2.4 parallel port subsystem ( a pdf doc) available on the net and could
understand how the layers are built over the lower level drivers for the parallel port, but couldnt figure out how to
send a charecter to the printer using the higher layers . i tried /dev/parport0 but it failed as i mentioned already.
Any pointers or advice would be helpfull

thank you.

cheers,
Amith