HAL_CAP_TX_CHAINMASK
case HAL_CAP_TX_CHAINMASK: /* mask of TX chains supported */
case HAL_CAP_TX_CHAINMASK:
(ath_hal_getcapability(_ah, HAL_CAP_TX_CHAINMASK, 0, _ptxchainmask))
(ath_hal_setcapability(_ah, HAL_CAP_TX_CHAINMASK, 1, _tx, NULL))