parport problems with devfs

[Nico Schottelius <nicos@pcsystems.de>]

[-- Attachment #1: Type: text/plain, Size: 182 bytes --]

Hello!

I attached the problem occured with parport and devfs.
I don't exactly know where the problem in the parport source
is. If someone has a patch for it, I will test it.

Nico


[-- Attachment #2: DEVFS_parport --]
[-- Type: text/plain, Size: 2058 bytes --]


# Loading the parport and parport_pc modules for my parallelport
flapp:/home/user/nico/gpm-1.19.3 # modprobe parport_pc

# is there an entry in /dev ?
flapp:/home/user/nico/gpm-1.19.3 # ls /dev/
.         cdroms   fb      initctl  mem   ptmx    root     usb
..        console  full    input    misc  pts     shm      vc
.devfsd   cpu      gpmctl  kmem     null  pty     tty      vcc
apm_bios  discs    ide     log      port  random  urandom  zero

# What does the kernel message say ?
flapp:/home/user/nico/gpm-1.19.3 # dmesg  | tail -n 14
usb.c: registered new driver hid
mice: PS/2 mouse device common for all mice
0x378: FIFO is 16 bytes
0x378: writeIntrThreshold is 7
0x378: readIntrThreshold is 7
0x378: PWord is 8 bits
0x378: Interrupts are ISA-Pulses
0x378: ECP port cfgA=0x10 cfgB=0x49
0x378: ECP settings irq=7 dma=1
parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,COMPAT,ECP]
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)


# Have a look what lp0 has been before
>From /usr/src/linux/Documentation/ :
  6 char        Parallel printer devices
                  0 = /dev/lp0          Parallel printer on parport0
                  1 = /dev/lp1          Parallel printer on parport1

# make our own device out of /dev
flapp:/ # mknod /lp0 c 6 0

# has anything happened ? No! 
flapp:/ # ls /dev/
.         cdroms   fb      initctl  mem   ptmx    root     usb
..        console  full    input    misc  pts     shm      vc
.devfsd   cpu      gpmctl  kmem     null  pty     tty      vcc
apm_bios  discs    ide     log      port  random  urandom  zero

# Use the printer the easiest way :)
flapp:/ # cat /tmp/* > lp0

# And now... 
flapp:/ # ls /dev/
.         cdroms   fb      initctl  mem   printers  random  urandom  zero
..        console  full    input    misc  ptmx      root    usb
.devfsd   cpu      gpmctl  kmem     null  pts       shm     vc
apm_bios  discs    ide     log      port  pty       tty     vcc

# there is now the entry printers/0.