If the driver and its firmware are correctly in place, it may be that your specific model isn’t supported. Haiku has a compatibility layer that can use FreeBSD 9.3 wifi drivers. FreeBSD is currently at 11 (?) and it may be that your device wasn’t supported back at 9.3…
The device should otherwise just appear at /dev/net/.
You can check how Haiku identifies your device with
To see if it has loaded the appropriate driver, but for some reason it apparently doesn’t work, try
listimage | grep drivers