- irqreturn_t res = IRQ_NONE;
-
- if(dn_irqs[irq-160].handler) {
- res = dn_irqs[irq-160].handler(irq,dn_irqs[irq-160].dev_id,fp);
- } else {
- printk("spurious irq %d occurred\n",irq);
- }
-
- *(volatile unsigned char *)(pica)=0x20;
- *(volatile unsigned char *)(picb)=0x20;
-
- return res;
-}
-
-void dn_init_IRQ(void) {
-
- int i;
-
- for(i=0;i<16;i++) {
- dn_irqs[i].handler=NULL;
- dn_irqs[i].flags=IRQ_FLG_STD;
- dn_irqs[i].dev_id=NULL;
- dn_irqs[i].devname=NULL;
- }
-
-}
-
-int dn_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id) {
-
- if((irq<0) || (irq>15)) {
- printk("Trying to request invalid IRQ\n");
- return -ENXIO;
- }
-
- if(!dn_irqs[irq].handler) {
- dn_irqs[irq].handler=handler;
- dn_irqs[irq].flags=IRQ_FLG_STD;
- dn_irqs[irq].dev_id=dev_id;
- dn_irqs[irq].devname=devname;
- if(irq<8)
- *(volatile unsigned char *)(pica+1)&=~(1<<irq);
- else
- *(volatile unsigned char *)(picb+1)&=~(1<<(irq-8));
-
- return 0;
- }
- else {
- printk("Trying to request already assigned irq %d\n",irq);
- return -ENXIO;
- }
-
-}
-
-void dn_free_irq(unsigned int irq, void *dev_id) {
-
- if((irq<0) || (irq>15)) {
- printk("Trying to free invalid IRQ\n");
- return ;
- }
-
- if(irq<8)
- *(volatile unsigned char *)(pica+1)|=(1<<irq);
- else
- *(volatile unsigned char *)(picb+1)|=(1<<(irq-8));
-
- dn_irqs[irq].handler=NULL;
- dn_irqs[irq].flags=IRQ_FLG_STD;
- dn_irqs[irq].dev_id=NULL;
- dn_irqs[irq].devname=NULL;
-
- return ;
-
-}
-
-void dn_enable_irq(unsigned int irq) {
-
- printk("dn enable irq\n");
-
-}
-
-void dn_disable_irq(unsigned int irq) {
-
- printk("dn disable irq\n");