drivers/media/video/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. */
  37 int 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 }