I’m on a 2009 mbp with the exact same Broadcom chip. Wifi works fine using the B43 driver. Here’s a (lengthy) thread to make it work: Broadcom Wi Fi not working with Manjaro 6.1.12-1 .
Inxi should show:
Device-2: Broadcom BCM4322 802.11a/b/g/n Wireless LAN
driver: b43-pci-bridge