If your BCM43228 wireless device is not recognized by Fedora 21/22 :

wget http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
rpm -ivh rpmfusion-nonfree-release-22.noarch.rpm
dnf clean all
dnf install akmod-wl
dnf install kernel-devel
akmods --force
modprobe wl
iwconfig
systemctl restart NetworkManager

On my HP Probook :

lspci | grep -i network
02:00.0 Network controller: Broadcom Corporation BCM43228 802.11a/b/g/n

iwconfig
wlo1      IEEE 802.11abg  ESSID:"myAP"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: AB:CD:EF:12:34:56  
          Bit Rate=65 Mb/s   Tx-Power=200 dBm  
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=70/70  Signal level=-37 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0