ioreg_write
ctx->card->ioreg_write(ctx->card, CU16(base + 1), temp);
void (* ioreg_write)(struct card_info *, uint32_t, uint32_t); /* filled by driver */
atom_card_info->ioreg_write = cail_reg_write;
atom_card_info->ioreg_write = cail_ioreg_write;