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irq.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *                   Creative Labs, Inc.
 *  Routines for IRQ control of EMU10K1 chips
 *
 *  BUGS:
 *    --
 *
 *  TODO:
 *    --
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/emu10k1.h>

irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
      emu10k1_t *emu = dev_id;
      unsigned int status, status2, orig_status, orig_status2;
      int handled = 0;

      while ((status = inl(emu->port + IPR)) != 0) {
            //printk("emu10k1 irq - status = 0x%x\n", status);
            orig_status = status;
            handled = 1;
            if (status & IPR_PCIERROR) {
                  snd_printk(KERN_ERR "interrupt: PCI error\n");
                  snd_emu10k1_intr_disable(emu, INTE_PCIERRORENABLE);
                  status &= ~IPR_PCIERROR;
            }
            if (status & (IPR_VOLINCR|IPR_VOLDECR|IPR_MUTE)) {
                  if (emu->hwvol_interrupt)
                        emu->hwvol_interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_VOLINCRENABLE|INTE_VOLDECRENABLE|INTE_MUTEENABLE);
                  status &= ~(IPR_VOLINCR|IPR_VOLDECR|IPR_MUTE);
            }
            if (status & IPR_CHANNELLOOP) {
                  int voice;
                  int voice_max = status & IPR_CHANNELNUMBERMASK;
                  u32 val;
                  emu10k1_voice_t *pvoice = emu->voices;

                  val = snd_emu10k1_ptr_read(emu, CLIPL, 0);
                  for (voice = 0; voice <= voice_max; voice++) {
                        if (voice == 0x20)
                              val = snd_emu10k1_ptr_read(emu, CLIPH, 0);
                        if (val & 1) {
                              if (pvoice->use && pvoice->interrupt != NULL) {
                                    pvoice->interrupt(emu, pvoice);
                                    snd_emu10k1_voice_intr_ack(emu, voice);
                              } else {
                                    snd_emu10k1_voice_intr_disable(emu, voice);
                              }
                        }
                        val >>= 1;
                        pvoice++;
                  }
                  val = snd_emu10k1_ptr_read(emu, HLIPL, 0);
                  for (voice = 0; voice <= voice_max; voice++) {
                        if (voice == 0x20)
                              val = snd_emu10k1_ptr_read(emu, HLIPH, 0);
                        if (val & 1) {
                              if (pvoice->use && pvoice->interrupt != NULL) {
                                    pvoice->interrupt(emu, pvoice);
                                    snd_emu10k1_voice_half_loop_intr_ack(emu, voice);
                              } else {
                                    snd_emu10k1_voice_half_loop_intr_disable(emu, voice);
                              }
                        }
                        val >>= 1;
                        pvoice++;
                  }
                  status &= ~IPR_CHANNELLOOP;
            }
            status &= ~IPR_CHANNELNUMBERMASK;
            if (status & (IPR_ADCBUFFULL|IPR_ADCBUFHALFFULL)) {
                  if (emu->capture_interrupt)
                        emu->capture_interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_ADCBUFENABLE);
                  status &= ~(IPR_ADCBUFFULL|IPR_ADCBUFHALFFULL);
            }
            if (status & (IPR_MICBUFFULL|IPR_MICBUFHALFFULL)) {
                  if (emu->capture_mic_interrupt)
                        emu->capture_mic_interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_MICBUFENABLE);
                  status &= ~(IPR_MICBUFFULL|IPR_MICBUFHALFFULL);
            }
            if (status & (IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL)) {
                  if (emu->capture_efx_interrupt)
                        emu->capture_efx_interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_EFXBUFENABLE);
                  status &= ~(IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL);
            }
            if (status & (IPR_MIDITRANSBUFEMPTY|IPR_MIDIRECVBUFEMPTY)) {
                  if (emu->midi.interrupt)
                        emu->midi.interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_MIDITXENABLE|INTE_MIDIRXENABLE);
                  status &= ~(IPR_MIDITRANSBUFEMPTY|IPR_MIDIRECVBUFEMPTY);
            }
            if (status & (IPR_A_MIDITRANSBUFEMPTY2|IPR_A_MIDIRECVBUFEMPTY2)) {
                  if (emu->midi2.interrupt)
                        emu->midi2.interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_A_MIDITXENABLE2|INTE_A_MIDIRXENABLE2);
                  status &= ~(IPR_A_MIDITRANSBUFEMPTY2|IPR_A_MIDIRECVBUFEMPTY2);
            }
            if (status & IPR_INTERVALTIMER) {
                  if (emu->timer)
                        snd_timer_interrupt(emu->timer, emu->timer->sticks);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
                  status &= ~IPR_INTERVALTIMER;
            }
            if (status & (IPR_GPSPDIFSTATUSCHANGE|IPR_CDROMSTATUSCHANGE)) {
                  if (emu->spdif_interrupt)
                        emu->spdif_interrupt(emu, status);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_GPSPDIFENABLE|INTE_CDSPDIFENABLE);
                  status &= ~(IPR_GPSPDIFSTATUSCHANGE|IPR_CDROMSTATUSCHANGE);
            }
            if (status & IPR_FXDSP) {
                  if (emu->dsp_interrupt)
                        emu->dsp_interrupt(emu);
                  else
                        snd_emu10k1_intr_disable(emu, INTE_FXDSPENABLE);
                  status &= ~IPR_FXDSP;
            }
            if (status & IPR_P16V) {
                  while ((status2 = inl(emu->port + IPR2)) != 0) {
                        u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
                        emu10k1_voice_t *pvoice = &(emu->p16v_voices[0]);
                        emu10k1_voice_t *cvoice = &(emu->p16v_capture_voice);

                        //printk(KERN_INFO "status2=0x%x\n", status2);
                        orig_status2 = status2;
                        if(status2 & mask) {
                              if(pvoice->use) {
                                    snd_pcm_period_elapsed(pvoice->epcm->substream);
                              } else { 
                                    snd_printk(KERN_ERR "p16v: status: 0x%08x, mask=0x%08x, pvoice=%p, use=%d\n", status2, mask, pvoice, pvoice->use);
                              }
                        }
                        if(status2 & 0x110000) {
                              //printk(KERN_INFO "capture int found\n");
                              if(cvoice->use) {
                                    //printk(KERN_INFO "capture period_elapsed\n");
                                    snd_pcm_period_elapsed(cvoice->epcm->substream);
                              }
                        }
                        outl(orig_status2, emu->port + IPR2); /* ack all */
                  }
                  status &= ~IPR_P16V;
            }

            if (status) {
                  unsigned int bits;
                  snd_printk(KERN_ERR "emu10k1: unhandled interrupt: 0x%08x\n", status);
                  //make sure any interrupts we don't handle are disabled:
                  bits = INTE_FXDSPENABLE |
                        INTE_PCIERRORENABLE |
                        INTE_VOLINCRENABLE |
                        INTE_VOLDECRENABLE |
                        INTE_MUTEENABLE |
                        INTE_MICBUFENABLE |
                        INTE_ADCBUFENABLE |
                        INTE_EFXBUFENABLE |
                        INTE_GPSPDIFENABLE |
                        INTE_CDSPDIFENABLE |
                        INTE_INTERVALTIMERENB |
                        INTE_MIDITXENABLE |
                        INTE_MIDIRXENABLE;
                  if (emu->audigy)
                        bits |= INTE_A_MIDITXENABLE2 | INTE_A_MIDIRXENABLE2;
                  snd_emu10k1_intr_disable(emu, bits);
            }
            outl(orig_status, emu->port + IPR); /* ack all */
      }
      return IRQ_RETVAL(handled);
}

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