drivers/dd/sound/mixer.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * FILE:             drivers/dd/sound/mixer.c
   5  * PURPOSE:          Wave Mixer?
   6  * PROGRAMMER:       ?
   7  *
   8  * UPDATE HISTORY:
   9  *              ??/??/??: Created
  10  *              10/23/02: Steven Edwards (Steven_Ed4153@yahoo.com)
  11  *                        Minor build fixes
  12  */
  13
  14 #include "dsp.h"
  15 #include "sb16.h"
  16 #include "mixer.h"
  17
  18 unsigned char read_mixer(unsigned short base,unsigned char reg)
  19 {
  20
  21         outb(base+0x04,reg);
  22         return inb(base+0x05);
  23 }
  24
  25 unsigned char get_irq(SB16* sb16)
  26 {
  27         unsigned char irq;
  28         irq=(read_mixer(sb16->base,MIXER_INTERRUPT_SETUP_REGISTER)&0x0f);
  29
  30         if(irq==1) sb16->irq=2;
  31         if(irq==2) sb16->irq=5;
  32         if(irq==4) sb16->irq=7;
  33         if(irq==8) sb16->irq=10;
  34         return 0;
  35 }
  36
  37 void get_dma(SB16* sb16)
  38 {
  39         unsigned char hi,lo,result=read_mixer(sb16->base,MIXER_DMA_SETUP_REGISTER);
  40   hi=result&0xE0;
  41   lo=result&0x0B;
  42   if(hi==0x80) sb16->dma16=7;
  43   if(hi==0x40) sb16->dma16=6;
  44   if(hi==0x20) sb16->dma16=5;
  45
  46   if(lo==0x08) sb16->dma8=3;
  47   if(lo==0x02) sb16->dma8=1;
  48   if(lo==0x01) sb16->dma8=0;
  49 }