git.openwrt.org Git - openwrt/staging/neocturne.git/blob

   1 From 74de23a947ad5964b25e9f9f15329d3174488fea Mon Sep 17 00:00:00 2001
   2 From: Joerg Schambacher <joerg@hifiberry.com>
   3 Date: Wed, 6 Oct 2021 17:21:07 +0200
   4 Subject: [PATCH] Hifiberry DAC+ADCPro: adding optional headphone amp
   5  control
   6
   7 This is a copy of the code and approach from our DAC+ driver.
   8 It allows to probe (and activate) an optional TPA6130A2 headphone
   9 amplifier. Updated email address.
  10
  11 Signed-off-by: Joerg Schambacher <joerg@hifiberry.com>
  12 ---
  13  sound/soc/bcm/Kconfig                   |  3 +-
  14  sound/soc/bcm/hifiberry_dacplusadcpro.c | 74 ++++++++++++++++++++++++-
  15  2 files changed, 73 insertions(+), 4 deletions(-)
  16
  17 --- a/sound/soc/bcm/Kconfig
  18 +++ b/sound/soc/bcm/Kconfig
  19 @@ -79,7 +79,8 @@ config SND_BCM2708_SOC_HIFIBERRY_DACPLUS
  20          tristate "Support for HifiBerry DAC+ADC PRO"
  21          depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  22          select SND_SOC_PCM512x_I2C
  23 -       select SND_SOC_PCM186X_I2C
  24 +        select SND_SOC_PCM186X_I2C
  25 +        select SND_SOC_TPA6130A2
  26          select COMMON_CLK_HIFIBERRY_DACPRO
  27          help
  28           Say Y or M if you want to add support for HifiBerry DAC+ADC PRO.
  29 --- a/sound/soc/bcm/hifiberry_dacplusadcpro.c
  30 +++ b/sound/soc/bcm/hifiberry_dacplusadcpro.c
  31 @@ -4,8 +4,8 @@
  32   * Author:     Daniel Matuschek, Stuart MacLean <stuart@hifiberry.com>
  33   *             Copyright 2014-2015
  34   *             based on code by Florian Meier <florian.meier@koalo.de>
  35 - *             ADC added by Joerg Schambacher <joerg@i2audio.com>
  36 - *             Copyright 2018-19
  37 + *             ADC, HP added by Joerg Schambacher <joerg@hifiberry.com>
  38 + *             Copyright 2018-21
  39   *
  40   * This program is free software; you can redistribute it and/or
  41   * modify it under the terms of the GNU General Public License
  42 @@ -26,6 +26,7 @@
  43  #include <linux/of.h>
  44  #include <linux/slab.h>
  45  #include <linux/delay.h>
  46 +#include <linux/i2c.h>
  47
  48  #include <sound/core.h>
  49  #include <sound/pcm.h>
  50 @@ -468,6 +469,15 @@ static struct snd_soc_dai_link snd_rpi_h
  51  },
  52  };
  53
  54 +/* aux device for optional headphone amp */
  55 +static struct snd_soc_aux_dev hifiberry_dacplusadcpro_aux_devs[] = {
  56 +       {
  57 +               .dlc = {
  58 +                       .name = "tpa6130a2.1-0060",
  59 +               },
  60 +       },
  61 +};
  62 +
  63  /* audio machine driver */
  64  static struct snd_soc_card snd_rpi_hifiberry_dacplusadcpro = {
  65         .name         = "snd_rpi_hifiberry_dacplusadcpro",
  66 @@ -477,10 +487,68 @@ static struct snd_soc_card snd_rpi_hifib
  67         .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dacplusadcpro_dai),
  68  };
  69
  70 +static int hb_hp_detect(void)
  71 +{
  72 +       struct i2c_adapter *adap = i2c_get_adapter(1);
  73 +       int ret;
  74 +       struct i2c_client tpa_i2c_client = {
  75 +               .addr = 0x60,
  76 +               .adapter = adap,
  77 +       };
  78 +
  79 +       if (!adap)
  80 +               return -EPROBE_DEFER;   /* I2C module not yet available */
  81 +
  82 +       ret = i2c_smbus_read_byte(&tpa_i2c_client) >= 0;
  83 +       i2c_put_adapter(adap);
  84 +       return ret;
  85 +};
  86 +
  87 +static struct property tpa_enable_prop = {
  88 +              .name = "status",
  89 +              .length = 4 + 1, /* length 'okay' + 1 */
  90 +              .value = "okay",
  91 +       };
  92 +
  93  static int snd_rpi_hifiberry_dacplusadcpro_probe(struct platform_device *pdev)
  94  {
  95         int ret = 0, i = 0;
  96         struct snd_soc_card *card = &snd_rpi_hifiberry_dacplusadcpro;
  97 +       struct device_node *tpa_node;
  98 +       struct property *tpa_prop;
  99 +       struct of_changeset ocs;
 100 +       int len;
 101 +
 102 +       /* probe for head phone amp */
 103 +       ret = hb_hp_detect();
 104 +       if (ret < 0)
 105 +               return ret;
 106 +       if (ret) {
 107 +               card->aux_dev = hifiberry_dacplusadcpro_aux_devs;
 108 +               card->num_aux_devs =
 109 +                               ARRAY_SIZE(hifiberry_dacplusadcpro_aux_devs);
 110 +               tpa_node = of_find_compatible_node(NULL, NULL, "ti,tpa6130a2");
 111 +               tpa_prop = of_find_property(tpa_node, "status", &len);
 112 +
 113 +               if (strcmp((char *)tpa_prop->value, "okay")) {
 114 +                       /* and activate headphone using change_sets */
 115 +                       dev_info(&pdev->dev, "activating headphone amplifier");
 116 +                       of_changeset_init(&ocs);
 117 +                       ret = of_changeset_update_property(&ocs, tpa_node,
 118 +                                                       &tpa_enable_prop);
 119 +                       if (ret) {
 120 +                               dev_err(&pdev->dev,
 121 +                               "cannot activate headphone amplifier\n");
 122 +                               return -ENODEV;
 123 +                       }
 124 +                       ret = of_changeset_apply(&ocs);
 125 +                       if (ret) {
 126 +                               dev_err(&pdev->dev,
 127 +                               "cannot activate headphone amplifier\n");
 128 +                               return -ENODEV;
 129 +                       }
 130 +               }
 131 +       }
 132
 133         snd_rpi_hifiberry_dacplusadcpro.dev = &pdev->dev;
 134         if (pdev->dev.of_node) {
 135 @@ -531,7 +599,7 @@ static struct platform_driver snd_rpi_hi
 136
 137  module_platform_driver(snd_rpi_hifiberry_dacplusadcpro_driver);
 138
 139 -MODULE_AUTHOR("Joerg Schambacher <joerg@i2audio.com>");
 140 +MODULE_AUTHOR("Joerg Schambacher <joerg@hifiberry.com>");
 141  MODULE_AUTHOR("Daniel Matuschek <daniel@hifiberry.com>");
 142  MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+ADC");
 143  MODULE_LICENSE("GPL v2");