text: /*
   **********************************************************************
   *     irqmgr.c - IRQ manager for emu10k1 driver
   *     Copyright 1999, 2000 Creative Labs, Inc.
   *
   **********************************************************************
   *
   *     Date                 Author          Summary of changes
   *     ----                 ------          ------------------
   *     October 20, 1999     Bertrand Lee    base code release
   *
   **********************************************************************
   *
   *     This program is free software; you can redistribute it and/or
   *     modify it under the terms of the GNU General Public License as
   *     published by the Free Software Foundation; either version 2 of
   *     the License, or (at your option) any later version.
   *
   *     This program is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *     GNU General Public License for more details.
   *
   *     You should have received a copy of the GNU General Public
   *     License along with this program; if not, write to the Free
   *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
   *     USA.
   *
   **********************************************************************
   */
  
  #include "hwaccess.h"
  #include "8010.h"
  #include "cardmi.h"
  #include "cardmo.h"
  #include "irqmgr.h"
  
  /* Interrupt handler */
  
  irqreturn_t emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  {
  	struct emu10k1_card *card = (struct emu10k1_card *) dev_id;
  	u32 irqstatus, irqstatus_tmp;
  	int handled = 0;
  
  	DPD(4, "emu10k1_interrupt called, irq =  %u\n", irq);
  
  	/*
  	 ** NOTE :
  	 ** We do a 'while loop' here cos on certain machines, with both
  	 ** playback and recording going on at the same time, IRQs will
  	 ** stop coming in after a while. Checking IPND indeed shows that
  	 ** there are interrupts pending but the PIC says no IRQs pending.
  	 ** I suspect that some boards need edge-triggered IRQs but are not
  	 ** getting that condition if we don't completely clear the IPND
  	 ** (make sure no more interrupts are pending).
  	 ** - Eric
  	 */
  
  	while ((irqstatus = inl(card->iobase + IPR))) {
  		DPD(4, "irq status %#x\n", irqstatus);
  
  		irqstatus_tmp = irqstatus;
  
  		if (irqstatus & IRQTYPE_TIMER) {
  			emu10k1_timer_irqhandler(card);
  			irqstatus &= ~IRQTYPE_TIMER;
  		}
  
  		if (irqstatus & IRQTYPE_DSP) {
  			emu10k1_dsp_irqhandler(card);
  			irqstatus &= ~IRQTYPE_DSP;
  		}
  
  		if (irqstatus & IRQTYPE_MPUIN) {
  			emu10k1_mpuin_irqhandler(card);
  			irqstatus &= ~IRQTYPE_MPUIN;
  		}
  
  		if (irqstatus & IRQTYPE_MPUOUT) {
  			emu10k1_mpuout_irqhandler(card);
  			irqstatus &= ~IRQTYPE_MPUOUT;
  		}
  
  		if (irqstatus & IPR_MUTE) {
  			emu10k1_mute_irqhandler(card);
  			irqstatus &=~IPR_MUTE;
  		}
  
  		if (irqstatus & IPR_VOLINCR) {
  			emu10k1_volincr_irqhandler(card);
  			irqstatus &=~IPR_VOLINCR;
  		}
  
  		if (irqstatus & IPR_VOLDECR) {
  			emu10k1_voldecr_irqhandler(card);
  			irqstatus &=~IPR_VOLDECR;
  		}
  
  		if (irqstatus){
  			printk(KERN_ERR "emu10k1: Warning, unhandled interrupt: %#08x\n", irqstatus);
  			//make sure any interrupts we don't handle are disabled:
  			emu10k1_irq_disable(card, ~(INTE_MIDIRXENABLE | INTE_MIDITXENABLE | INTE_INTERVALTIMERENB |
  						INTE_VOLDECRENABLE | INTE_VOLINCRENABLE | INTE_MUTEENABLE |
  						INTE_FXDSPENABLE));
  		}
  
  		/* acknowledge interrupt */
  		outl(irqstatus_tmp, card->iobase + IPR);
  		handled = 1;
  	}
  	return IRQ_RETVAL(handled);
  }
  