original development tree for Linux kernel GTP module; now long in mainline.
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linux-gtp/net/irda/Kconfig

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#
# IrDA protocol configuration
#
menuconfig IRDA
depends on NET && !S390
tristate "IrDA (infrared) subsystem support"
select CRC_CCITT
---help---
Say Y here if you want to build support for the IrDA (TM) protocols.
The Infrared Data Associations (tm) specifies standards for wireless
infrared communication and is supported by most laptops and PDA's.
To use Linux support for the IrDA (tm) protocols, you will also need
some user-space utilities like irattach. For more information, see
the file <file:Documentation/networking/irda.txt>. You also want to
read the IR-HOWTO, available at
<http://www.tldp.org/docs.html#howto>.
If you want to exchange bits of data (vCal, vCard) with a PDA, you
will need to install some OBEX application, such as OpenObex :
<http://sourceforge.net/projects/openobex/>
To compile this support as a module, choose M here: the module will
be called irda.
comment "IrDA protocols"
depends on IRDA
source "net/irda/irlan/Kconfig"
source "net/irda/irnet/Kconfig"
source "net/irda/ircomm/Kconfig"
config IRDA_ULTRA
bool "Ultra (connectionless) protocol"
depends on IRDA
help
Say Y here to support the connectionless Ultra IRDA protocol.
Ultra allows to exchange data over IrDA with really simple devices
(watch, beacon) without the overhead of the IrDA protocol (no handshaking,
no management frames, simple fixed header).
Ultra is available as a special socket : socket(AF_IRDA, SOCK_DGRAM, 1);
comment "IrDA options"
depends on IRDA
config IRDA_CACHE_LAST_LSAP
bool "Cache last LSAP"
depends on IRDA
help
Say Y here if you want IrLMP to cache the last LSAP used. This
makes sense since most frames will be sent/received on the same
connection. Enabling this option will save a hash-lookup per frame.
If unsure, say Y.
config IRDA_FAST_RR
bool "Fast RRs (low latency)"
depends on IRDA
---help---
Say Y here is you want IrLAP to send fast RR (Receive Ready) frames
when acting as a primary station.
Disabling this option will make latency over IrDA very bad. Enabling
this option will make the IrDA stack send more packet than strictly
necessary, thus reduce your battery life (but not that much).
Fast RR will make IrLAP send out a RR frame immediately when
receiving a frame if its own transmit queue is currently empty. This
will give a lot of speed improvement when receiving much data since
the secondary station will not have to wait the max. turn around
time (usually 500ms) before it is allowed to transmit the next time.
If the transmit queue of the secondary is also empty, the primary will
start backing-off before sending another RR frame, waiting longer
each time until the back-off reaches the max. turn around time.
This back-off increase in controlled via
/proc/sys/net/irda/fast_poll_increase
If unsure, say Y.
config IRDA_DEBUG
bool "Debug information"
depends on IRDA
help
Say Y here if you want the IrDA subsystem to write debug information
to your syslog. You can change the debug level in
/proc/sys/net/irda/debug .
When this option is enabled, the IrDA also perform many extra internal
verifications which will usually prevent the kernel to crash in case of
bugs.
If unsure, say Y (since it makes it easier to find the bugs).
source "drivers/net/irda/Kconfig"