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

   1 From defa915bf0acf6ab5e56997a6733546c33f87682 Mon Sep 17 00:00:00 2001
   2 From: Joerg Schambacher <joerg@i2audio.com>
   3 Date: Tue, 7 Jul 2020 15:09:06 +0200
   4 Subject: [PATCH] Enhances the DAC+ driver to control the optional
   5  headphone amplifier
   6
   7 Probes on the I2C bus for TPA6130A2, if successful, it sets DT-parameter
   8 'status' from 'disabled' to 'okay' using change_sets to enable
   9 the headphone control.
  10
  11 Signed-off-by: Joerg Schambacher joerg@i2audio.com
  12 ---
  13  sound/soc/bcm/Kconfig             |  1 +
  14  sound/soc/bcm/hifiberry_dacplus.c | 68 ++++++++++++++++++++++++++++++-
  15  2 files changed, 67 insertions(+), 2 deletions(-)
  16
  17 --- a/sound/soc/bcm/Kconfig
  18 +++ b/sound/soc/bcm/Kconfig
  19 @@ -38,6 +38,7 @@ config SND_BCM2708_SOC_HIFIBERRY_DACPLUS
  20          tristate "Support for HifiBerry DAC+"
  21          depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  22          select SND_SOC_PCM512x
  23 +        select SND_SOC_TPA6130A2
  24          select COMMON_CLK_HIFIBERRY_DACPRO
  25          help
  26           Say Y or M if you want to add support for HifiBerry DAC+.
  27 --- a/sound/soc/bcm/hifiberry_dacplus.c
  28 +++ b/sound/soc/bcm/hifiberry_dacplus.c
  29 @@ -4,6 +4,7 @@
  30   * Author:     Daniel Matuschek, Stuart MacLean <stuart@hifiberry.com>
  31   *             Copyright 2014-2015
  32   *             based on code by Florian Meier <florian.meier@koalo.de>
  33 + *             Headphone added by Joerg Schambacher, joerg@i2audio.com
  34   *
  35   * This program is free software; you can redistribute it and/or
  36   * modify it under the terms of the GNU General Public License
  37 @@ -24,6 +25,7 @@
  38  #include <linux/of.h>
  39  #include <linux/slab.h>
  40  #include <linux/delay.h>
  41 +#include <linux/i2c.h>
  42
  43  #include <sound/core.h>
  44  #include <sound/pcm.h>
  45 @@ -177,8 +179,7 @@ static int snd_rpi_hifiberry_dacplus_ini
  46         else
  47                 snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
  48
  49 -       if (digital_gain_0db_limit)
  50 -       {
  51 +       if (digital_gain_0db_limit) {
  52                 int ret;
  53                 struct snd_soc_card *card = rtd->card;
  54
  55 @@ -292,6 +293,15 @@ static struct snd_soc_dai_link snd_rpi_h
  56  },
  57  };
  58
  59 +/* aux device for optional headphone amp */
  60 +static struct snd_soc_aux_dev hifiberry_dacplus_aux_devs[] = {
  61 +       {
  62 +               .dlc = {
  63 +                       .name = "tpa6130a2.1-0060",
  64 +               },
  65 +       },
  66 +};
  67 +
  68  /* audio machine driver */
  69  static struct snd_soc_card snd_rpi_hifiberry_dacplus = {
  70         .name         = "snd_rpi_hifiberry_dacplus",
  71 @@ -301,9 +311,63 @@ static struct snd_soc_card snd_rpi_hifib
  72         .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dacplus_dai),
  73  };
  74
  75 +static int hb_hp_detect(void)
  76 +{
  77 +       struct i2c_adapter *adap = i2c_get_adapter(1);
  78 +       int ret;
  79 +
  80 +       struct i2c_client tpa_i2c_client = {
  81 +               .addr = 0x60,
  82 +               .adapter = adap,
  83 +       };
  84 +
  85 +       ret = i2c_smbus_read_byte(&tpa_i2c_client) >= 0;
  86 +       i2c_put_adapter(adap);
  87 +       return ret;
  88 +};
  89 +
  90 +static struct property tpa_enable_prop = {
  91 +              .name = "status",
  92 +              .length = 4 + 1, /* length 'okay' + 1 */
  93 +              .value = "okay",
  94 +       };
  95 +
  96  static int snd_rpi_hifiberry_dacplus_probe(struct platform_device *pdev)
  97  {
  98         int ret = 0;
  99 +       struct snd_soc_card *card = &snd_rpi_hifiberry_dacplus;
 100 +       int len;
 101 +       struct device_node *tpa_node;
 102 +       struct property *tpa_prop;
 103 +       struct of_changeset ocs;
 104 +
 105 +       /* probe for head phone amp */
 106 +       if (hb_hp_detect()) {
 107 +               card->aux_dev = hifiberry_dacplus_aux_devs;
 108 +               card->num_aux_devs =
 109 +                               ARRAY_SIZE(hifiberry_dacplus_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_dacplus.dev = &pdev->dev;
 134         if (pdev->dev.of_node) {