Re: [parport] Use of inb/out in backends...

From: stef (
Date: Fri Jun 01 2001 - 09:29:43 PDT

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    On Fri, Jun 01, 2001 at 10:32:56AM +0100, Tim Waugh wrote:
    > On Mon, May 28, 2001 at 11:24:37PM +0100, Tim Waugh wrote:
    > > I think that a step in the right direction would be to have a shared
    > > library providing the same functionality as /dev/parport, and have
    > > the library use the native OS support if available, and fall back to
    > > inb/outb or whatever, failing if not root.
    > >
    > > (For the special case of collection IEEE 1284 Device IDs, there are
    > > other fallbacks to try first involving /proc, and so this should be a
    > > part of the interface.)
    > FWIW, I have made a small start on this. Any suggestions about how
    > the interface should look would be greatly appreciated.
    > Thanks,
    > Tim.
    > */

            I think that the functions might be like:

            - sanei_parport_open():

                    does ioperm/iopl, /dev/io opening when no ppdev support
                    opens ppdev if available

            - sanei_parport_info():

                    gives info about parport

            - sanei_parport_lock() / sanei_parport_unlock():

                    parport locking, will act as a dummy function if there is no
                    ppdev, unless OS provides another way of locking

            - sanei_parport_set_mode():

                    sets parport mode . Should be able when needed to effectively
                    set the mode, and not simply flag the next read/write

            - sanei_parport_get_mode():
                    reads parport current mode

            - sanei_parport_inb(), sanei_parport_outb(), sanei_parport_insb(),
                    sanei_parport_outsb(), sanei_parport_insl(), sanei_parport_outsl():

                    for raw access.

            - sanei_parport_read()/sanei_parport_write():
                    reads and writes accordingly to the selected mode

            - sanei_parport_close()

                    closes anything opened


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