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