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-i2c.h"
  26 #include "cx18-cards.h"
  27 #include "cx18-audio.h"
  28
  29 /* Selects the audio input and output according to the current
  30    settings. */
  31 int cx18_audio_set_io(struct cx18 *cx)
  32 {
  33         struct v4l2_routing route;
  34         u32 audio_input;
  35         int mux_input;
  36
  37         /* Determine which input to use */
  38         if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
  39                 audio_input = cx->card->radio_input.audio_input;
  40                 mux_input = cx->card->radio_input.muxer_input;
  41         } else {
  42                 audio_input =
  43                         cx->card->audio_inputs[cx->audio_input].audio_input;
  44                 mux_input =
  45                         cx->card->audio_inputs[cx->audio_input].muxer_input;
  46         }
  47
  48         /* handle muxer chips */
  49         route.input = mux_input;
  50         route.output = 0;
  51         cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
  52
  53         route.input = audio_input;
  54         return cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
  55                         VIDIOC_INT_S_AUDIO_ROUTING, &route);
  56 }
  57
  58 void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route)
  59 {
  60         cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
  61                         VIDIOC_INT_S_AUDIO_ROUTING, route);
  62 }
  63
  64 void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq)
  65 {
  66         static u32 freqs[3] = { 44100, 48000, 32000 };
  67
  68         /* The audio clock of the digitizer must match the codec sample
  69            rate otherwise you get some very strange effects. */
  70         if (freq > 2)
  71                 return;
  72         cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
  73 }