BWN_HF_UCODE_ANTDIV_HELPER
hf = bwn_hf_read(mac) & ~BWN_HF_UCODE_ANTDIV_HELPER;
hf |= BWN_HF_UCODE_ANTDIV_HELPER;
bwn_hf_write(mac, bwn_hf_read(mac) & ~BWN_HF_UCODE_ANTDIV_HELPER);
bwn_hf_write(mac, bwn_hf_read(mac) | BWN_HF_UCODE_ANTDIV_HELPER);