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