bridge_set
bridge_set(bc, b_int_enable, (1 << pin));
bridge_set(bc, b_int_enable, 0x7ffffe00); /* more stuff in int_enable */
bridge_set(bc, b_int_mode, (1UL << pin));
bridge_set(bc, b_wid_control, BRIDGE_CTRL_PAGE_SIZE);
bridge_set(bc, b_device[slot].reg, BRIDGE_DEV_SWAP_DIR);