ppui patches for NetBSD 5.1


This page describes patches for NetBSD 5.1 (i386 port only) to add support for the parallel port user space API 'ppui' (originally written for FreeBSD and there named 'ppi'). Look at the outdated ppbus project page.
The lower layer named 'ppbus' is already part of NetBSD 5.1, this patch only adds the upper layer 'ppui' that provides access to the parallel port pins via ioctl(2).


ppui patch for NetBSD 5.1 (tar archive) [Size: 30KiByte]

How to apply and use the patches

Step 1

Prepare a NetBSD 5.1 kernel source tree. Extract the patch file from the tar archive and copy it into the toplevel directory "src". Change into that directory and apply the patches like this:

# patch -p1 <patch_ppui_NetBSD5.1

Step 2

Configure the patched kernel to use the new parallel port system like this:

# Disable old lpt printer driver

# PCI parallel printer interfaces
#lpt*   at puc? port ?

# ISA parallel printer interfaces
#lpt0   at isa? port 0x378 irq 7        # Standard PC parallel
#lpt1   at isa? port 0x278
#lpt2   at isa? port 0x3bc

# Enable new ppbus based drivers

# atppc device
# flag values: 0x01 - disable irq, 0x02 - disable dma
# Parallel port directly configured on ISA bus
atppc0    at isa? port 0x378 irq 7 flags 0x02
# Parallel port configured by ACPI
#atppc*    at acpi? flags 0x00
# Parallel port configured by PNPBIOS
#atppc*    at pnpbios? index ? flags 0x00
# Parallel port on a PCI PUC
#atppc*    at puc? port ? flags 0x00
# Parallel port configured by ISAPNP
#atppc* at isapnp? flags 0x00
#options ATPPC_DEBUG

# ppbus device and flags
ppbus* at atppc?
#options PPBUS_DEBUG
#options DEBUG_1284
#options DONTPROBE_1284
#options PERIPH_1284

# Devices which attach to ppbus

# Printer
lpt* at ppbus?
#options LPT_DEBUG
#options LPT_VERBOSE

# Network device
plip* at ppbus?
#options PLIP_DEBUG

# PPS device
pps* at ppbus?

# ppui device
ppui* at ppbus?

Now compile and install the kernel as documented in NetBSD kernel documentation.

Step 3

After the next reboot, verify that the new drivers have been loaded. 'dmesg' should show something like that:

atppc0 at isa0 port 0x378-0x37f irq 7 drq : AT Parallel Port
atppc0: capabilities=29<INTR,PS2,EPP>
ppbus0 at atppc0
ppbus0: No IEEE1284 device found.
lpt0 at ppbus0: port mode = 1<COMPATIBLE>
plip0 at ppbus0
pps0 at ppbus0
ppui0 at ppbus0

Step 4

To let the world see the API of the ppui driver, copy the header file: "src/sys/dev/ppbus" from your kernel source tree to "/usr/include/dev/ppbus". If you want to compile a program that should use ppui, include this header file.

Now copy the man pages "src/man/*" to the "/usr/share/man/" directory. You can now view the manual pages ppui(4) and ppui(9).
The manual page ppbus(4) refers to ppui with the original name ppi from FreeBSD, but a driver called ppi is already present in NetBSD (HP300 port). This ppi driver does not use the ppbus framework, don't be confused.

Step 5

Finally you have to create device files for ppui in the "/dev" directory. The files are usually called "ppui<0-2>", but you can use any name. For the i386 port you have to create character device files with major number 104. The minor number is directly mapped to the devices: The first port have minor number 0, the second minor number 1 and so on.

Modify your "/dev/MAKEDEV.local" script like this:

   makedev_local ppui

   mkdev ppui0 c 104 0 600
   mkdev ppui1 c 104 1 600
   mkdev ppui2 c 104 2 600

And let the script create the device files for you:

./MAKEDEV.local ppui


Thanks to Gary Thorpe for porting the ppbus framework to NetBSD.

Browser        Last update: 2020-10-31        michael.baeuerle@gmx.net