firmware/target/arm/imx31/gigabeat-s/wmcodec-gigabeat-s.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Gigabeat S specific code for the WM8978 codec
  11  *
  12  * Copyright (C) 2008 Michael Sevakis
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "config.h"
  24 #include "system.h"
  25 #include "kernel.h"
  26 #include "sound.h"
  27 #include "wmcodec.h"
  28 #include "i2s.h"
  29 #include "i2c-imx31.h"
  30
  31 /* NOTE: Some port-specific bits will have to be moved away (node and GPIO
  32  * writes) for cleanest implementation. */
  33
  34 static struct i2c_node wm8978_i2c_node =
  35 {
  36     .num  = I2C1_NUM,
  37     .ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
  38                              /* Just hard-code for now - scaling may require
  39                               * updating */
  40     .addr = WMC_I2C_ADDR,
  41 };
  42
  43 void audiohw_init(void)
  44 {
  45     i2s_reset();
  46
  47     i2c_enable_node(&wm8978_i2c_node, true);
  48
  49     audiohw_preinit();
  50
  51     imx31_regset32(&GPIO3_DR, (1 << 21)); /* Turn on analogue LDO */
  52 }
  53
  54 void audiohw_enable_headphone_jack(bool enable)
  55 {
  56     /* Turn headphone jack output on or off. */
  57     imx31_regmod32(&GPIO3_DR, enable ? (1 << 22) : 0, (1 << 22));
  58 }
  59
  60 void wmcodec_write(int reg, int data)
  61 {
  62     unsigned char d[2];
  63     /* |aaaaaaad|dddddddd| */
  64     d[0] = (reg << 1) | ((data & 0x100) >> 8);
  65     d[1] = data;
  66     i2c_write(&wm8978_i2c_node, d, 2);
  67 }