static irqreturn_t hp_sdc_isr(int irq, void *dev_id)
{
	uint8_t status, data;

	status = hp_sdc_status_in8();
	/* Read data unconditionally to advance i8042. */
	data =   hp_sdc_data_in8();

	/* For now we are ignoring these until we get the SDC to behave. */
	if (((status & 0xf1) == 0x51) && data == 0x82)
		return IRQ_HANDLED;

	switch (status & HP_SDC_STATUS_IRQMASK) {
	case 0: /* This case is not documented. */
		break;

	case HP_SDC_STATUS_USERTIMER:
	case HP_SDC_STATUS_PERIODIC:
	case HP_SDC_STATUS_TIMER:
		read_lock(&hp_sdc.hook_lock);
		if (hp_sdc.timer != NULL)
			hp_sdc.timer(irq, dev_id, status, data);
		read_unlock(&hp_sdc.hook_lock);
		break;

	case HP_SDC_STATUS_REG:
		hp_sdc_take(irq, dev_id, status, data);
		break;

	case HP_SDC_STATUS_HILCMD:
	case HP_SDC_STATUS_HILDATA:
		read_lock(&hp_sdc.hook_lock);
		if (hp_sdc.hil != NULL)
			hp_sdc.hil(irq, dev_id, status, data);
		read_unlock(&hp_sdc.hook_lock);
		break;

	case HP_SDC_STATUS_PUP:
		read_lock(&hp_sdc.hook_lock);
		if (hp_sdc.pup != NULL)
			hp_sdc.pup(irq, dev_id, status, data);
		else
			printk(KERN_INFO PREFIX "HP SDC reports successful PUP.\n");
		read_unlock(&hp_sdc.hook_lock);
		break;

	default:
		read_lock(&hp_sdc.hook_lock);
		if (hp_sdc.cooked != NULL)
			hp_sdc.cooked(irq, dev_id, status, data);
		read_unlock(&hp_sdc.hook_lock);
		break;
	}

	return IRQ_HANDLED;
}

static void hp_sdc_nmisr(int irq, void *dev_id, struct pt_regs * regs) {
	int status;
	
	status = hp_sdc_status_in8();
	printk(KERN_WARNING PREFIX "NMI !\n");

#if 0	
	if (status & HP_SDC_NMISTATUS_FHS) {
		read_lock(&hp_sdc.hook_lock);
	      	if (hp_sdc.timer != NULL)
			hp_sdc.timer(irq, dev_id, status, 0);
		read_unlock(&hp_sdc.hook_lock);
	}
	else {
		/* TODO: pass this on to the HIL handler, or do SAK here? */
		printk(KERN_WARNING PREFIX "HIL NMI\n");
	}
#endif
}