target/linux/bcm27xx/patches-5.4/950-0064-Add-Support-for-JustBoom-Audio-boards.patch

   1 From 752d2f2029aa9b3710e9fef40757d834899e3ff1 Mon Sep 17 00:00:00 2001
   2 From: Aaron Shaw <shawaj@gmail.com>
   3 Date: Thu, 7 Apr 2016 21:26:21 +0100
   4 Subject: [PATCH] Add Support for JustBoom Audio boards
   5
   6 justboom-dac: Adjust for ALSA API change
   7
   8 As of 4.4, snd_soc_limit_volume now takes a struct snd_soc_card *
   9 rather than a struct snd_soc_codec *.
  10
  11 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  12
  13 ASoC: justboom-dac: fix S24_LE format
  14
  15 Remove set_bclk_ratio call so 24-bit data is transmitted in
  16 24 bclk cycles.
  17
  18 Also remove hw_params as it's no longer needed.
  19
  20 Signed-off-by: Matthias Reichl <hias@horus.com>
  21
  22 ASoC: justboom-dac: use modern dai_link style
  23
  24 Signed-off-by: Matthias Reichl <hias@horus.com>
  25 ---
  26  sound/soc/bcm/justboom-dac.c | 147 +++++++++++++++++++++++++++++++++++
  27  1 file changed, 147 insertions(+)
  28  create mode 100644 sound/soc/bcm/justboom-dac.c
  29
  30 --- /dev/null
  31 +++ b/sound/soc/bcm/justboom-dac.c
  32 @@ -0,0 +1,147 @@
  33 +/*
  34 + * ASoC Driver for JustBoom DAC Raspberry Pi HAT Sound Card
  35 + *
  36 + * Author:     Milan Neskovic
  37 + *             Copyright 2016
  38 + *             based on code by Daniel Matuschek <info@crazy-audio.com>
  39 + *             based on code by Florian Meier <florian.meier@koalo.de>
  40 + *
  41 + * This program is free software; you can redistribute it and/or
  42 + * modify it under the terms of the GNU General Public License
  43 + * version 2 as published by the Free Software Foundation.
  44 + *
  45 + * This program is distributed in the hope that it will be useful, but
  46 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  47 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  48 + * General Public License for more details.
  49 + */
  50 +
  51 +#include <linux/module.h>
  52 +#include <linux/platform_device.h>
  53 +
  54 +#include <sound/core.h>
  55 +#include <sound/pcm.h>
  56 +#include <sound/pcm_params.h>
  57 +#include <sound/soc.h>
  58 +#include <sound/jack.h>
  59 +
  60 +#include "../codecs/pcm512x.h"
  61 +
  62 +static bool digital_gain_0db_limit = true;
  63 +
  64 +static int snd_rpi_justboom_dac_init(struct snd_soc_pcm_runtime *rtd)
  65 +{
  66 +       struct snd_soc_component *component = rtd->codec_dai->component;
  67 +       snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08);
  68 +       snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0xf, 0x02);
  69 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08,0x08);
  70 +
  71 +       if (digital_gain_0db_limit)
  72 +       {
  73 +               int ret;
  74 +               struct snd_soc_card *card = rtd->card;
  75 +
  76 +               ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
  77 +               if (ret < 0)
  78 +                       dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
  79 +       }
  80 +
  81 +       return 0;
  82 +}
  83 +
  84 +static int snd_rpi_justboom_dac_startup(struct snd_pcm_substream *substream) {
  85 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  86 +       struct snd_soc_component *component = rtd->codec_dai->component;
  87 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08,0x08);
  88 +       return 0;
  89 +}
  90 +
  91 +static void snd_rpi_justboom_dac_shutdown(struct snd_pcm_substream *substream) {
  92 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  93 +       struct snd_soc_component *component = rtd->codec_dai->component;
  94 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08,0x00);
  95 +}
  96 +
  97 +/* machine stream operations */
  98 +static struct snd_soc_ops snd_rpi_justboom_dac_ops = {
  99 +       .startup = snd_rpi_justboom_dac_startup,
 100 +       .shutdown = snd_rpi_justboom_dac_shutdown,
 101 +};
 102 +
 103 +SND_SOC_DAILINK_DEFS(hifi,
 104 +       DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
 105 +       DAILINK_COMP_ARRAY(COMP_CODEC("pcm512x.1-004d", "pcm512x-hifi")),
 106 +       DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
 107 +
 108 +static struct snd_soc_dai_link snd_rpi_justboom_dac_dai[] = {
 109 +{
 110 +       .name           = "JustBoom DAC",
 111 +       .stream_name    = "JustBoom DAC HiFi",
 112 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 113 +                               SND_SOC_DAIFMT_CBS_CFS,
 114 +       .ops            = &snd_rpi_justboom_dac_ops,
 115 +       .init           = snd_rpi_justboom_dac_init,
 116 +       SND_SOC_DAILINK_REG(hifi),
 117 +},
 118 +};
 119 +
 120 +/* audio machine driver */
 121 +static struct snd_soc_card snd_rpi_justboom_dac = {
 122 +       .name         = "snd_rpi_justboom_dac",
 123 +       .driver_name  = "JustBoomDac",
 124 +       .owner        = THIS_MODULE,
 125 +       .dai_link     = snd_rpi_justboom_dac_dai,
 126 +       .num_links    = ARRAY_SIZE(snd_rpi_justboom_dac_dai),
 127 +};
 128 +
 129 +static int snd_rpi_justboom_dac_probe(struct platform_device *pdev)
 130 +{
 131 +       int ret = 0;
 132 +
 133 +       snd_rpi_justboom_dac.dev = &pdev->dev;
 134 +
 135 +       if (pdev->dev.of_node) {
 136 +           struct device_node *i2s_node;
 137 +           struct snd_soc_dai_link *dai = &snd_rpi_justboom_dac_dai[0];
 138 +           i2s_node = of_parse_phandle(pdev->dev.of_node,
 139 +                                       "i2s-controller", 0);
 140 +
 141 +           if (i2s_node) {
 142 +                       dai->cpus->dai_name = NULL;
 143 +                       dai->cpus->of_node = i2s_node;
 144 +                       dai->platforms->name = NULL;
 145 +                       dai->platforms->of_node = i2s_node;
 146 +           }
 147 +
 148 +           digital_gain_0db_limit = !of_property_read_bool(
 149 +                       pdev->dev.of_node, "justboom,24db_digital_gain");
 150 +       }
 151 +
 152 +       ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_justboom_dac);
 153 +       if (ret && ret != -EPROBE_DEFER)
 154 +               dev_err(&pdev->dev,
 155 +                       "snd_soc_register_card() failed: %d\n", ret);
 156 +
 157 +       return ret;
 158 +}
 159 +
 160 +static const struct of_device_id snd_rpi_justboom_dac_of_match[] = {
 161 +       { .compatible = "justboom,justboom-dac", },
 162 +       {},
 163 +};
 164 +MODULE_DEVICE_TABLE(of, snd_rpi_justboom_dac_of_match);
 165 +
 166 +static struct platform_driver snd_rpi_justboom_dac_driver = {
 167 +       .driver = {
 168 +               .name   = "snd-rpi-justboom-dac",
 169 +               .owner  = THIS_MODULE,
 170 +               .of_match_table = snd_rpi_justboom_dac_of_match,
 171 +       },
 172 +       .probe          = snd_rpi_justboom_dac_probe,
 173 +};
 174 +
 175 +module_platform_driver(snd_rpi_justboom_dac_driver);
 176 +
 177 +MODULE_AUTHOR("Milan Neskovic <info@justboom.co>");
 178 +MODULE_DESCRIPTION("ASoC Driver for JustBoom PI DAC HAT Sound Card");
 179 +MODULE_LICENSE("GPL v2");