TXRX_CSR0_KEY_ID
mask = TXRX_CSR0_KEY_ID.bit_mask;
reg = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
mask = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
rt2x00_set_field16(®, TXRX_CSR0_KEY_ID, mask);
rt2x00_set_field16(®, TXRX_CSR0_KEY_ID, 0);