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
  19 #include "cx18-driver.h"
  20 #include "cx18-io.h"
  21 #include "cx18-cards.h"
  22 #include "cx18-audio.h"
  23
  24 #define CX18_AUDIO_ENABLE    0xc72014
  25 #define CX18_AI1_MUX_MASK    0x30
  26 #define CX18_AI1_MUX_I2S1    0x00
  27 #define CX18_AI1_MUX_I2S2    0x10
  28 #define CX18_AI1_MUX_843_I2S 0x20
  29
  30 /* Selects the audio input and output according to the current
  31    settings. */
  32 int cx18_audio_set_io(struct cx18 *cx)
  33 {
  34         const struct cx18_card_audio_input *in;
  35         u32 u, v;
  36         int err;
  37
  38         /* Determine which input to use */
  39         if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
  40                 in = &cx->card->radio_input;
  41         else
  42                 in = &cx->card->audio_inputs[cx->audio_input];
  43
  44         /* handle muxer chips */
  45         v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
  46                          (u32) in->muxer_input, 0, 0);
  47
  48         err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
  49                                audio, s_routing, in->audio_input, 0, 0);
  50         if (err)
  51                 return err;
  52
  53         /* FIXME - this internal mux should be abstracted to a subdev */
  54         u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
  55         v = u & ~CX18_AI1_MUX_MASK;
  56         switch (in->audio_input) {
  57         case CX18_AV_AUDIO_SERIAL1:
  58                 v |= CX18_AI1_MUX_I2S1;
  59                 break;
  60         case CX18_AV_AUDIO_SERIAL2:
  61                 v |= CX18_AI1_MUX_I2S2;
  62                 break;
  63         default:
  64                 v |= CX18_AI1_MUX_843_I2S;
  65                 break;
  66         }
  67         if (v == u) {
  68                 /* force a toggle of some AI1 MUX control bits */
  69                 u &= ~CX18_AI1_MUX_MASK;
  70                 switch (in->audio_input) {
  71                 case CX18_AV_AUDIO_SERIAL1:
  72                         u |= CX18_AI1_MUX_843_I2S;
  73                         break;
  74                 case CX18_AV_AUDIO_SERIAL2:
  75                         u |= CX18_AI1_MUX_843_I2S;
  76                         break;
  77                 default:
  78                         u |= CX18_AI1_MUX_I2S1;
  79                         break;
  80                 }
  81                 cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
  82                                       u, CX18_AI1_MUX_MASK);
  83         }
  84         cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
  85                               v, CX18_AI1_MUX_MASK);
  86         return 0;
  87 }