Messages in this thread |  | | | Subject | Re: ppdev - libieee1284.so conflicts with 2.6.21 | | From | Jonsito <> | | Date | Wed, 04 Jul 2007 13:58:10 +0200 |
El mar, 03-07-2007 a las 17:31 -0400, Chuck Ebbert escribió:
> On 07/03/2007 02:16 AM, Juan Antonio Martinez wrote:
[...]
> When it is working it says:
>
> ppdev: user-space parallel port driver
> ppdev0: registered pardevice
> ppdev0: unregistered pardevice
> ppdev0: registered pardevice
> ppdev0: negotiated back to compatibility mode because user-space forgot
> ppdev0: unregistered pardevice
> ppdev0: registered pardevice
> ppdev0: unregistered pardevice
>
> When broken:
>
> ppdev: user-space parallel port driver
> ppdev0: registered pardevice
> ppdev0: unregistered pardevice
>
> I give up, what causes that?
Please skip extra registered/unregistered pairs: was additional tests.
More info:
I've download vanilla libieee1284 and linux-2.6.21.5 code
libieee1284 includes kernel headers for ppdev.h and parport.h;
they are slightly different than kernel ones, but differences
only apply to "#ifdef __KERNEL" section.
Not sure on collateral effects
libieee1284 fails in claim() returning E1284_SYS (System Call Error).
Failed line is "ioctl(port->fd, PPCLAIM)" from access_ppdev.c
Looking at ppdev.c seems that parport_claim_or_block() fails.
Need further study
Juan Antonio
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