release/src-rt-6.x/linux/linux-2.6/drivers/media/video/ivtv/ivtv-audio.c

   1 /*
   2     Audio-related ivtv functions.
   3     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   4     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "ivtv-driver.h"
  22 #include "ivtv-mailbox.h"
  23 #include "ivtv-i2c.h"
  24 #include "ivtv-gpio.h"
  25 #include "ivtv-cards.h"
  26 #include "ivtv-audio.h"
  27 #include <media/msp3400.h>
  28 #include <linux/videodev.h>
  29
  30 /* Selects the audio input and output according to the current
  31    settings. */
  32 int ivtv_audio_set_io(struct ivtv *itv)
  33 {
  34         struct v4l2_routing route;
  35         u32 audio_input;
  36         int mux_input;
  37
  38         /* Determine which input to use */
  39         if (test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
  40                 audio_input = itv->card->radio_input.audio_input;
  41                 mux_input = itv->card->radio_input.muxer_input;
  42         } else {
  43                 audio_input = itv->card->audio_inputs[itv->audio_input].audio_input;
  44                 mux_input = itv->card->audio_inputs[itv->audio_input].muxer_input;
  45         }
  46
  47         /* handle muxer chips */
  48         route.input = mux_input;
  49         route.output = 0;
  50         ivtv_i2c_hw(itv, itv->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
  51
  52         route.input = audio_input;
  53         if (itv->card->hw_audio & IVTV_HW_MSP34XX) {
  54                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
  55         }
  56         return ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, &route);
  57 }
  58
  59 void ivtv_audio_set_route(struct ivtv *itv, struct v4l2_routing *route)
  60 {
  61         ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, route);
  62 }
  63
  64 void ivtv_audio_set_audio_clock_freq(struct ivtv *itv, 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         ivtv_call_i2c_clients(itv, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
  73 }
  74