default or selected kernelversion does not have config value CONFIG_IWLAGN.
Result is shown for kernelversion 6.2.5

Intel Wireless WiFi Next Gen AGN - Wireless-N/Advanced-N/Ultimate-N (iwlagn)

modulename: iwlagn.ko

configname: CONFIG_IWLAGN

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Intel Wireless WiFi Next Gen AGN - Wireless-N/Advanced-N/Ultimate-N (iwlagn)
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Select to build the driver supporting the:

Intel Wireless WiFi Link Next-Gen AGN

This option enables support for use with the following hardware:
Intel Wireless WiFi Link 6250AGN Adapter
Intel 6000 Series Wi-Fi Adapters (6200AGN and 6300AGN)
Intel WiFi Link 1000BGN
Intel Wireless WiFi 5150AGN
Intel Wireless WiFi 5100AGN, 5300AGN, and 5350AGN
Intel 6005 Series Wi-Fi Adapters
Intel 6030 Series Wi-Fi Adapters
Intel Wireless WiFi Link 6150BGN 2 Adapter
Intel 100 Series Wi-Fi Adapters (100BGN and 130BGN)
Intel 2000 Series Wi-Fi Adapters


This driver uses the kernel's mac80211 subsystem.

In order to use this driver, you will need a microcode (uCode)
image for it. You can obtain the microcode from:

<http://intellinuxwireless.org/>.

The microcode is typically installed in /lib/firmware. You can
look in the hotplug script /etc/hotplug/firmware.agent to
determine which directory FIRMWARE_DIR is set to when the script
runs.

If you want to compile the driver as a module ( = code which can be
inserted in and removed from the running kernel whenever you want),
say M here and read Documentation/kbuild/modules.txt. The
module will be called iwlagn.

source code: