LXR linux/drivers/media/pci/cx18/cx18-audio.c

   1/*
   2 *  cx18 audio-related functions
   3 *
   4 *  Derived from ivtv-audio.c
   5 *
   6 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License as published by
  10 *  the Free Software Foundation; either version 2 of the License, or
  11 *  (at your option) any later version.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21 *  02111-1307  USA
  22 */
  23
  24#include "cx18-driver.h"
  25#include "cx18-io.h"
  26#include "cx18-cards.h"
  27#include "cx18-audio.h"
  28
  29#define CX18_AUDIO_ENABLE    0xc72014
  30#define CX18_AI1_MUX_MASK    0x30
  31#define CX18_AI1_MUX_I2S1    0x00
  32#define CX18_AI1_MUX_I2S2    0x10
  33#define CX18_AI1_MUX_843_I2S 0x20
  34
  35/* Selects the audio input and output according to the current
  36   settings. */
  37int cx18_audio_set_io(struct cx18 *cx)
  38{
  39        const struct cx18_card_audio_input *in;
  40        u32 u, v;
  41        int err;
  42
  43        /* Determine which input to use */
  44        if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
  45                in = &cx->card->radio_input;
  46        else
  47                in = &cx->card->audio_inputs[cx->audio_input];
  48
  49        /* handle muxer chips */
  50        v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
  51                         (u32) in->muxer_input, 0, 0);
  52
  53        err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
  54                               audio, s_routing, in->audio_input, 0, 0);
  55        if (err)
  56                return err;
  57
  58        /* FIXME - this internal mux should be abstracted to a subdev */
  59        u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
  60        v = u & ~CX18_AI1_MUX_MASK;
  61        switch (in->audio_input) {
  62        case CX18_AV_AUDIO_SERIAL1:
  63                v |= CX18_AI1_MUX_I2S1;
  64                break;
  65        case CX18_AV_AUDIO_SERIAL2:
  66                v |= CX18_AI1_MUX_I2S2;
  67                break;
  68        default:
  69                v |= CX18_AI1_MUX_843_I2S;
  70                break;
  71        }
  72        if (v == u) {
  73                /* force a toggle of some AI1 MUX control bits */
  74                u &= ~CX18_AI1_MUX_MASK;
  75                switch (in->audio_input) {
  76                case CX18_AV_AUDIO_SERIAL1:
  77                        u |= CX18_AI1_MUX_843_I2S;
  78                        break;
  79                case CX18_AV_AUDIO_SERIAL2:
  80                        u |= CX18_AI1_MUX_843_I2S;
  81                        break;
  82                default:
  83                        u |= CX18_AI1_MUX_I2S1;
  84                        break;
  85                }
  86                cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
  87                                      u, CX18_AI1_MUX_MASK);
  88        }
  89        cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
  90                              v, CX18_AI1_MUX_MASK);
  91        return 0;
  92}
  93