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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  cx18 audio-related functions
   4  *
   5  *  Derived from ivtv-audio.c
   6  *
   7  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   8  */
   9
  10 #include "cx18-driver.h"
  11 #include "cx18-io.h"
  12 #include "cx18-cards.h"
  13 #include "cx18-audio.h"
  14
  15 #define CX18_AUDIO_ENABLE    0xc72014
  16 #define CX18_AI1_MUX_MASK    0x30
  17 #define CX18_AI1_MUX_I2S1    0x00
  18 #define CX18_AI1_MUX_I2S2    0x10
  19 #define CX18_AI1_MUX_843_I2S 0x20
  20
  21 /* Selects the audio input and output according to the current
  22    settings. */
  23 int cx18_audio_set_io(struct cx18 *cx)
  24 {
  25         const struct cx18_card_audio_input *in;
  26         u32 u, v;
  27         int err;
  28
  29         /* Determine which input to use */
  30         if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
  31                 in = &cx->card->radio_input;
  32         else
  33                 in = &cx->card->audio_inputs[cx->audio_input];
  34
  35         /* handle muxer chips */
  36         v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
  37                          (u32) in->muxer_input, 0, 0);
  38
  39         err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
  40                                audio, s_routing, in->audio_input, 0, 0);
  41         if (err)
  42                 return err;
  43
  44         /* FIXME - this internal mux should be abstracted to a subdev */
  45         u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
  46         v = u & ~CX18_AI1_MUX_MASK;
  47         switch (in->audio_input) {
  48         case CX18_AV_AUDIO_SERIAL1:
  49                 v |= CX18_AI1_MUX_I2S1;
  50                 break;
  51         case CX18_AV_AUDIO_SERIAL2:
  52                 v |= CX18_AI1_MUX_I2S2;
  53                 break;
  54         default:
  55                 v |= CX18_AI1_MUX_843_I2S;
  56                 break;
  57         }
  58         if (v == u) {
  59                 /* force a toggle of some AI1 MUX control bits */
  60                 u &= ~CX18_AI1_MUX_MASK;
  61                 switch (in->audio_input) {
  62                 case CX18_AV_AUDIO_SERIAL1:
  63                         u |= CX18_AI1_MUX_843_I2S;
  64                         break;
  65                 case CX18_AV_AUDIO_SERIAL2:
  66                         u |= CX18_AI1_MUX_843_I2S;
  67                         break;
  68                 default:
  69                         u |= CX18_AI1_MUX_I2S1;
  70                         break;
  71                 }
  72                 cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
  73                                       u, CX18_AI1_MUX_MASK);
  74         }
  75         cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
  76                               v, CX18_AI1_MUX_MASK);
  77         return 0;
  78 }