default or selected kernelversion does not have config value CONFIG_KS959_DONGLE.
Result is shown for kernelversion 6.7-rc3

KingSun KS-959 IrDA-USB dongle

modulename: ks959-sir.ko

configname: CONFIG_KS959_DONGLE

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>IrDA (infrared) subsystem support
└─>Infrared-port device drivers
└─>KingSun KS-959 IrDA-USB dongle
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Say Y or M here if you want to build support for the KingSun KS-959
IrDA-USB bridge device driver.

This USB bridge does not conform to the IrDA-USB device class
specification, and therefore needs its own specific driver. This
dongle supports SIR speeds only (9600 through 57600 bps).

To compile it as a module, choose M here: the module will be called

source code: