firmware/drivers/dac.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "config.h"
  20 #include "stdbool.h"
  21 #include "i2c.h"
  22 #include "debug.h"
  23 #include "dac.h"
  24
  25 #ifdef HAVE_DAC3550A
  26
  27 static bool line_in_enabled = false;
  28 static bool dac_enabled = false;
  29
  30
  31 int dac_volume(unsigned int left, unsigned int right, bool deemph)
  32 {
  33     int ret = 0;
  34     unsigned char buf[3];
  35
  36     i2c_begin();
  37
  38     if (left > 0x38)
  39         left = 0x38;
  40     if (right > 0x38)
  41         right = 0x38;
  42
  43     buf[0] = DAC_REG_WRITE | DAC_AVOL;
  44     buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0);
  45     buf[2] = right & 0x3f;
  46
  47     /* send write command */
  48     if (i2c_write(DAC_DEV_WRITE,buf,3))
  49     {
  50         ret = -1;
  51     }
  52
  53     i2c_end();
  54     return ret;
  55 }
  56
  57 /******************************************************************
  58 ** Bit6:  0 = 3V        1 = 5V
  59 ** Bit5:  0 = normal    1 = low power
  60 ** Bit4:  0 = AUX2 off  1 = AUX2 on
  61 ** Bit3:  0 = AUX1 off  1 = AUX1 on
  62 ** Bit2:  0 = DAC off   1 = DAC on
  63 ** Bit1:  0 = stereo    1 = mono
  64 ** Bit0:  0 = normal right amp   1 = inverted right amp
  65 ******************************************************************/
  66 /* dac_config is called once to initialize it. we will apply
  67    our static settings because of the init flow.
  68    dac_init -> dac_line_in -> mpeg_init -> dac_config
  69 */
  70 static int dac_config(void)
  71 {
  72     int ret = 0;
  73     unsigned char buf[2];
  74
  75     i2c_begin();
  76
  77     buf[0] = DAC_REG_WRITE | DAC_GCFG;
  78     buf[1] = (dac_enabled ? 0x04 : 0) |
  79         (line_in_enabled ? 0x08 : 0);
  80
  81     /* send write command */
  82     if (i2c_write(DAC_DEV_WRITE,buf,2))
  83     {
  84         ret = -1;
  85     }
  86
  87     i2c_end();
  88     return ret;
  89 }
  90
  91 void dac_enable(bool enable)
  92 {
  93     dac_enabled = enable;
  94     dac_config();
  95 }
  96
  97 void dac_line_in(bool enable)
  98 {
  99     line_in_enabled = enable;
 100     dac_config();
 101 }
 102
 103 void dac_init(void)
 104 {
 105     unsigned char buf[2];
 106
 107     i2c_begin();
 108
 109     buf[0] = DAC_REG_WRITE | DAC_SR_REG;
 110     buf[1] = 0x07;
 111
 112     /* send write command */
 113     i2c_write(DAC_DEV_WRITE,buf,2);
 114     i2c_end();
 115 }
 116
 117 #endif