target/linux/brcm2708/patches-3.14/0052-fix-soc-core-s-inverse-range-and-let-IQaudIO-DAC-use.patch

   1 From 7d86ec6d4ad388d8287a68d31ff3e3028477fd86 Mon Sep 17 00:00:00 2001
   2 From: Gordon Garrity <gordon@iqaudio.com>
   3 Date: Sun, 30 Mar 2014 13:52:33 +0100
   4 Subject: [PATCH 52/54] fix soc-core's inverse range and let IQaudIO DAC use
   5  this fixed SOC_DOUBLE_R_RANGE_TLV support
   6
   7 ---
   8  sound/soc/codecs/pcm512x.c | 3 ++-
   9  sound/soc/soc-core.c       | 8 ++++----
  10  2 files changed, 6 insertions(+), 5 deletions(-)
  11
  12 --- a/sound/soc/codecs/pcm512x.c
  13 +++ b/sound/soc/codecs/pcm512x.c
  14 @@ -239,9 +239,10 @@ static const struct soc_enum pcm512x_ved
  15         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_2, PCM512x_VEDS_SHIFT, 4,
  16                         pcm512x_ramp_step_text);
  17
  18 +/* Don't let the DAC go into clipping by limiting the alsa volume control range */
  19  static const struct snd_kcontrol_new pcm512x_controls[] = {
  20  SOC_DOUBLE_R_RANGE_TLV("Playback Digital Volume", PCM512x_DIGITAL_VOLUME_2,
  21 -                PCM512x_DIGITAL_VOLUME_3, 0, 48, 255, 1, digital_tlv),
  22 +                PCM512x_DIGITAL_VOLUME_3, 0, 40, 255, 1, digital_tlv),
  23  SOC_DOUBLE("Playback Digital Switch", PCM512x_MUTE, PCM512x_RQML_SHIFT,
  24            PCM512x_RQMR_SHIFT, 1, 1),
  25
  26 --- a/sound/soc/soc-core.c
  27 +++ b/sound/soc/soc-core.c
  28 @@ -3072,8 +3072,8 @@ int snd_soc_put_volsw_range(struct snd_k
  29
  30         if (invert)
  31                 val = ((max - ucontrol->value.integer.value[0] + min) & mask);
  32 -    else
  33 -       val = (ucontrol->value.integer.value[0] & mask);
  34 +       else
  35 +               val = (ucontrol->value.integer.value[0] & mask);
  36         val_mask = mask << shift;
  37         val = val << shift;
  38
  39 @@ -3084,8 +3084,8 @@ int snd_soc_put_volsw_range(struct snd_k
  40         if (snd_soc_volsw_is_stereo(mc)) {
  41                 if (invert)
  42                         val = ((max - ucontrol->value.integer.value[1] + min) & mask);
  43 -        else
  44 -            val = (ucontrol->value.integer.value[1] & mask);
  45 +               else
  46 +                       val = (ucontrol->value.integer.value[1] & mask);
  47                 val_mask = mask << shift;
  48                 val = val << shift;
  49