workbench/devs/AHI/Drivers/Envy24HT/Revo51.c

   1 /*
   2     Copyright © 2005-2013, Davy Wentzler. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <proto/exec.h>
   7 #include <proto/expansion.h>
   8 #include "misc.h"
   9 #include "DriverData.h"
  10 #include "regs.h"
  11 #include "ak_codec.h"
  12 #include "Revo51.h"
  13
  14
  15 static void Revo51_Start(struct CardData *card)
  16 {
  17         unsigned char mask;
  18
  19         SaveGPIO(card->pci_dev, card);
  20 }
  21
  22
  23 static void Revo51_Stop(struct CardData *card)
  24 {
  25         RestoreGPIO(card->pci_dev, card);
  26 }
  27
  28
  29
  30 // Set the direction of the CLK and SDA lines:
  31 // For sending, use 1, 1
  32 static void  Revo51_SetDir_CLK_SDA(struct CardData *card, int clock, int data)
  33 {
  34         unsigned int mask = 0, val;
  35
  36     val = 0;
  37         if (clock)
  38                 val = REVO51_I2C_CLOCK; /* write SCL */
  39         if (data)
  40                 val |= REVO51_I2C_DATA; /* write SDA */
  41
  42    mask = REVO51_I2C_CLOCK | REVO51_I2C_DATA;
  43    card->gpio_dir &= ~mask;
  44    card->gpio_dir |= val;
  45    SetGPIODir(card->pci_dev, card, card->gpio_dir);
  46    SetGPIOMask(card, card->iobase, ~mask);
  47
  48 }
  49
  50
  51
  52 // Write data to the SDA line and clock to the SCL
  53 static void Revo51_Write_CLK_SDA(struct CardData *card, int clk, int data)
  54 {
  55         unsigned int val = 0, mask = REVO51_I2C_CLOCK | REVO51_I2C_DATA;;
  56
  57         if (clk)
  58                 val |= REVO51_I2C_CLOCK;
  59         if (data)
  60                 val |= REVO51_I2C_DATA;
  61
  62     card->gpio_dir |= mask;
  63         SetGPIODir(card->pci_dev, card, card->gpio_dir);
  64     SetGPIOMask(card, card->iobase, ~mask);
  65         SetGPIOData(card, card->iobase, mask & val);
  66
  67    MicroDelay(5);
  68 }
  69
  70
  71 static int Revo51_GetDataBit(struct CardData *card, int ack)
  72 {
  73         int bit;
  74
  75         if (ack)
  76                 MicroDelay(5);
  77
  78     // get data bit from the GPIO pines
  79     card->gpio_dir &= ~REVO51_I2C_DATA;
  80     SetGPIODir(card->pci_dev, card, card->gpio_dir);
  81     bit = GetGPIOData(card, card->iobase) & REVO51_I2C_DATA ? 1 : 0;
  82
  83         return bit;
  84 }
  85
  86
  87 static struct I2C_bit_ops Revo51_bit_ops = {
  88         Revo51_Start,
  89         Revo51_Stop,
  90         Revo51_SetDir_CLK_SDA,
  91         Revo51_Write_CLK_SDA,
  92         Revo51_GetDataBit,
  93 };
  94
  95
  96 void Revo51_Init(struct CardData *card)
  97 {
  98    unsigned char bytes[4];
  99
 100    /* create i2c devices */
 101    card->i2c = AllocI2C(0x40);
 102    card->i2c->bit = &Revo51_bit_ops;
 103
 104    card->bit_ops = &Revo51_bit_ops;
 105
 106    //DEBUGPRINTF("Resetting PT2258\n");
 107
 108    // step 1: clear reg 0xC0
 109    bytes[0] = 0xC0;
 110    WriteBytesI2C(card, card->i2c, bytes, 1);
 111
 112    // unmute all channels
 113    bytes[0] = REVO51_2258_UNMUTE;
 114    WriteBytesI2C(card, card->i2c, bytes, 1);
 115
 116    // set all 6 channels to no attenuation (0dB)
 117    bytes[0] = 0xD0;
 118    bytes[1] = 0xE0;
 119    WriteBytesI2C(card, card->i2c, bytes, 2);
 120 }
 121