I have a Vostro 2520 and not sure how to enable wireless on my machine. The details are given below, would appreciate any pointers to resolving this issue.

lsmod returns

Module                  Size  Used by ath9k                 132390  0 
ath9k_common           14053  1 ath9k ath9k_hw              411151  2
ath9k,ath9k_common ath                    24067  3
ath9k,ath9k_common,ath9k_hw b43                   365785  0  mac80211 
506816  2 ath9k,b43 cfg80211              205544  4
ath9k,ath,b43,mac80211 bcma                   26696  1 b43 ssb        
52752  1 b43 ndiswrapper           282628  0  ums_realtek           
18248  0  usb_storage            49198  1 ums_realtek uas             
18180  0  snd_hda_codec_hdmi     32474  1  snd_hda_codec_cirrus   
24002  1  joydev                 17693  0  parport_pc            
32866  0  ppdev                  17113  0  rfcomm                
47604  0  bnep                   18281  2  bluetooth            
180104  10 rfcomm,bnep psmouse                97362  0  dell_wmi      
12681  0  sparse_keymap          13890  1 dell_wmi snd_hda_intel      
33773  3  snd_hda_codec         127706  3
snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel snd_hwdep       
13668  1 snd_hda_codec snd_pcm                97188  3
snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_seq_midi          
13324  0  snd_rawmidi            30748  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi snd_seq               
61896  2 snd_seq_midi,snd_seq_midi_event snd_timer              29990 
2 snd_pcm,snd_seq snd_seq_device         14540  3
snd_seq_midi,snd_rawmidi,snd_seq wmi                    19256  1
dell_wmi snd                    78855  16
snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
mac_hid                13253  0  i915                  473240  3 
drm_kms_helper         46978  1 i915 uvcvideo               72627  0 
drm                   242038  4 i915,drm_kms_helper videodev          
98259  1 uvcvideo soundcore              15091  1 snd dell_laptop     
18119  0  dcdbas                 14490  1 dell_laptop i2c_algo_bit    
13423  1 i915 v4l2_compat_ioctl32    17128  1 videodev snd_page_alloc 
18529  2 snd_hda_intel,snd_pcm video                  19596  1 i915
serio_raw              13211  0  mei                    41616  0  lp  
17799  0  parport                46562  3 parport_pc,ppdev,lp r8169   
62099  0

sudo lshw -class network

  *-network UNCLAIMED     
       description: Network controller
       product: Broadcom Corporation
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:07:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:f7c00000-f7c07fff   *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eth0
       version: 07
       serial: 78:45:c4:a3:aa:65
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd
autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168e-3_0.0.4
03/27/12 ip=192.168.1.5 latency=0 link=yes multicast=yes port=MII
speed=100Mbit/s
       resources: irq:41 ioport:e000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff

rfkill list all

0: dell-wifi: Wireless LAN  Soft blocked: yes   Hard blocked: yes 1:
dell-bluetooth: Bluetooth   Soft blocked: yes   Hard blocked: yes