target/linux/brcm2708/patches-4.19/950-0080-sound-Support-for-Dion-Audio-LOCO-V2-DAC-AMP-HAT.patch

   1 From 3e2070202a0607fe572f565ed4c18aa964fc18e5 Mon Sep 17 00:00:00 2001
   2 From: Miquel <miquelblauw@hotmail.com>
   3 Date: Fri, 24 Feb 2017 20:51:06 +0100
   4 Subject: [PATCH 080/703] sound: Support for Dion Audio LOCO-V2 DAC-AMP HAT
   5
   6 Signed-off-by: Miquel Blauw <info@dionaudio.nl>
   7
   8 ASoC: dionaudio_loco-v2: fix S24_LE format
   9
  10 Remove set_bclk_ratio call so 24-bit data is transmitted in
  11 24 bclk cycles.
  12
  13 Also remove hw_params and ops as they are no longer needed.
  14
  15 Signed-off-by: Matthias Reichl <hias@horus.com>
  16 ---
  17  sound/soc/bcm/dionaudio_loco-v2.c | 115 ++++++++++++++++++++++++++++++
  18  1 file changed, 115 insertions(+)
  19  create mode 100644 sound/soc/bcm/dionaudio_loco-v2.c
  20
  21 --- /dev/null
  22 +++ b/sound/soc/bcm/dionaudio_loco-v2.c
  23 @@ -0,0 +1,115 @@
  24 +/*
  25 + * ASoC Driver for Dion Audio LOCO-V2 DAC-AMP
  26 + *
  27 + * Author:      Miquel Blauw <info@dionaudio.nl>
  28 + *              Copyright 2017
  29 + *
  30 + * Based on the software of the RPi-DAC writen by Florian Meier
  31 + *
  32 + * This program is free software; you can redistribute it and/or
  33 + * modify it under the terms of the GNU General Public License
  34 + * version 2 as published by the Free Software Foundation.
  35 + *
  36 + * This program is distributed in the hope that it will be useful, but
  37 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  38 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  39 + * General Public License for more details.
  40 + */
  41 +
  42 +#include <linux/module.h>
  43 +#include <linux/platform_device.h>
  44 +
  45 +#include <sound/core.h>
  46 +#include <sound/pcm.h>
  47 +#include <sound/pcm_params.h>
  48 +#include <sound/soc.h>
  49 +#include <sound/jack.h>
  50 +
  51 +static bool digital_gain_0db_limit = true;
  52 +
  53 +static int snd_rpi_dionaudio_loco_v2_init(struct snd_soc_pcm_runtime *rtd)
  54 +{
  55 +       if (digital_gain_0db_limit) {
  56 +               int ret;
  57 +               struct snd_soc_card *card = rtd->card;
  58 +
  59 +               ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
  60 +               if (ret < 0)
  61 +                       dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
  62 +       }
  63 +
  64 +       return 0;
  65 +}
  66 +
  67 +static struct snd_soc_dai_link snd_rpi_dionaudio_loco_v2_dai[] = {
  68 +{
  69 +       .name           = "DionAudio LOCO-V2",
  70 +       .stream_name    = "DionAudio LOCO-V2 DAC-AMP",
  71 +       .cpu_dai_name   = "bcm2708-i2s.0",
  72 +       .codec_dai_name = "pcm512x-hifi",
  73 +       .platform_name  = "bcm2708-i2s.0",
  74 +       .codec_name     = "pcm512x.1-004d",
  75 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  76 +                         SND_SOC_DAIFMT_CBS_CFS,
  77 +       .init           = snd_rpi_dionaudio_loco_v2_init,
  78 +},};
  79 +
  80 +/* audio machine driver */
  81 +static struct snd_soc_card snd_rpi_dionaudio_loco_v2 = {
  82 +       .name         = "Dion Audio LOCO-V2",
  83 +       .dai_link     = snd_rpi_dionaudio_loco_v2_dai,
  84 +       .num_links    = ARRAY_SIZE(snd_rpi_dionaudio_loco_v2_dai),
  85 +};
  86 +
  87 +static int snd_rpi_dionaudio_loco_v2_probe(struct platform_device *pdev)
  88 +{
  89 +       int ret = 0;
  90 +
  91 +       snd_rpi_dionaudio_loco_v2.dev = &pdev->dev;
  92 +
  93 +       if (pdev->dev.of_node) {
  94 +               struct device_node *i2s_node;
  95 +               struct snd_soc_dai_link *dai =
  96 +                                       &snd_rpi_dionaudio_loco_v2_dai[0];
  97 +
  98 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
  99 +                                           "i2s-controller", 0);
 100 +               if (i2s_node) {
 101 +                       dai->cpu_dai_name = NULL;
 102 +                       dai->cpu_of_node = i2s_node;
 103 +                       dai->platform_name = NULL;
 104 +                       dai->platform_of_node = i2s_node;
 105 +               }
 106 +
 107 +               digital_gain_0db_limit = !of_property_read_bool(
 108 +                       pdev->dev.of_node, "dionaudio,24db_digital_gain");
 109 +       }
 110 +
 111 +       ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_dionaudio_loco_v2);
 112 +       if (ret)
 113 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
 114 +                       ret);
 115 +
 116 +       return ret;
 117 +}
 118 +
 119 +static const struct of_device_id dionaudio_of_match[] = {
 120 +       { .compatible = "dionaudio,dionaudio-loco-v2", },
 121 +       {},
 122 +};
 123 +MODULE_DEVICE_TABLE(of, dionaudio_of_match);
 124 +
 125 +static struct platform_driver snd_rpi_dionaudio_loco_v2_driver = {
 126 +       .driver = {
 127 +               .name   = "snd-rpi-dionaudio-loco-v2",
 128 +               .owner  = THIS_MODULE,
 129 +               .of_match_table = dionaudio_of_match,
 130 +       },
 131 +       .probe          = snd_rpi_dionaudio_loco_v2_probe,
 132 +};
 133 +
 134 +module_platform_driver(snd_rpi_dionaudio_loco_v2_driver);
 135 +
 136 +MODULE_AUTHOR("Miquel Blauw <info@dionaudio.nl>");
 137 +MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO-V2");
 138 +MODULE_LICENSE("GPL v2");