target/linux/brcm2708/patches-4.4/0063-ASoC-Add-support-for-HifiBerry-DAC.patch

   1 From 9cf0b8eed930ac26384249e193c1c91044a460e1 Mon Sep 17 00:00:00 2001
   2 From: Florian Meier <florian.meier@koalo.de>
   3 Date: Fri, 22 Nov 2013 19:19:08 +0100
   4 Subject: [PATCH] ASoC: Add support for HifiBerry DAC
   5
   6 This adds a machine driver for the HifiBerry DAC.
   7 It is a sound card that can
   8 be stacked onto the Raspberry Pi.
   9
  10 Signed-off-by: Florian Meier <florian.meier@koalo.de>
  11 ---
  12  sound/soc/bcm/Kconfig         |   7 +++
  13  sound/soc/bcm/Makefile        |   4 ++
  14  sound/soc/bcm/hifiberry_dac.c | 122 ++++++++++++++++++++++++++++++++++++++++++
  15  3 files changed, 133 insertions(+)
  16  create mode 100644 sound/soc/bcm/hifiberry_dac.c
  17
  18 --- a/sound/soc/bcm/Kconfig
  19 +++ b/sound/soc/bcm/Kconfig
  20 @@ -7,3 +7,10 @@ config SND_BCM2835_SOC_I2S
  21           Say Y or M if you want to add support for codecs attached to
  22           the BCM2835 I2S interface. You will also need
  23           to select the audio interfaces to support below.
  24 +
  25 +config SND_BCM2708_SOC_HIFIBERRY_DAC
  26 +        tristate "Support for HifiBerry DAC"
  27 +        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  28 +        select SND_SOC_PCM5102A
  29 +        help
  30 +         Say Y or M if you want to add support for HifiBerry DAC.
  31 --- a/sound/soc/bcm/Makefile
  32 +++ b/sound/soc/bcm/Makefile
  33 @@ -3,3 +3,7 @@ snd-soc-bcm2835-i2s-objs := bcm2835-i2s.
  34
  35  obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
  36
  37 +# BCM2708 Machine Support
  38 +snd-soc-hifiberry-dac-objs := hifiberry_dac.o
  39 +
  40 +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
  41 --- /dev/null
  42 +++ b/sound/soc/bcm/hifiberry_dac.c
  43 @@ -0,0 +1,122 @@
  44 +/*
  45 + * ASoC Driver for HifiBerry DAC
  46 + *
  47 + * Author:     Florian Meier <florian.meier@koalo.de>
  48 + *             Copyright 2013
  49 + *
  50 + * This program is free software; you can redistribute it and/or
  51 + * modify it under the terms of the GNU General Public License
  52 + * version 2 as published by the Free Software Foundation.
  53 + *
  54 + * This program is distributed in the hope that it will be useful, but
  55 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  56 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  57 + * General Public License for more details.
  58 + */
  59 +
  60 +#include <linux/module.h>
  61 +#include <linux/platform_device.h>
  62 +
  63 +#include <sound/core.h>
  64 +#include <sound/pcm.h>
  65 +#include <sound/pcm_params.h>
  66 +#include <sound/soc.h>
  67 +#include <sound/jack.h>
  68 +
  69 +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
  70 +{
  71 +       return 0;
  72 +}
  73 +
  74 +static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,
  75 +                                      struct snd_pcm_hw_params *params)
  76 +{
  77 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  78 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  79 +
  80 +       unsigned int sample_bits =
  81 +               snd_pcm_format_physical_width(params_format(params));
  82 +
  83 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
  84 +}
  85 +
  86 +/* machine stream operations */
  87 +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
  88 +       .hw_params = snd_rpi_hifiberry_dac_hw_params,
  89 +};
  90 +
  91 +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
  92 +{
  93 +       .name           = "HifiBerry DAC",
  94 +       .stream_name    = "HifiBerry DAC HiFi",
  95 +       .cpu_dai_name   = "bcm2708-i2s.0",
  96 +       .codec_dai_name = "pcm5102a-hifi",
  97 +       .platform_name  = "bcm2708-i2s.0",
  98 +       .codec_name     = "pcm5102a-codec",
  99 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 100 +                               SND_SOC_DAIFMT_CBS_CFS,
 101 +       .ops            = &snd_rpi_hifiberry_dac_ops,
 102 +       .init           = snd_rpi_hifiberry_dac_init,
 103 +},
 104 +};
 105 +
 106 +/* audio machine driver */
 107 +static struct snd_soc_card snd_rpi_hifiberry_dac = {
 108 +       .name         = "snd_rpi_hifiberry_dac",
 109 +       .dai_link     = snd_rpi_hifiberry_dac_dai,
 110 +       .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
 111 +};
 112 +
 113 +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
 114 +{
 115 +       int ret = 0;
 116 +
 117 +       snd_rpi_hifiberry_dac.dev = &pdev->dev;
 118 +
 119 +       if (pdev->dev.of_node) {
 120 +           struct device_node *i2s_node;
 121 +           struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_dac_dai[0];
 122 +           i2s_node = of_parse_phandle(pdev->dev.of_node,
 123 +                                       "i2s-controller", 0);
 124 +
 125 +           if (i2s_node) {
 126 +               dai->cpu_dai_name = NULL;
 127 +               dai->cpu_of_node = i2s_node;
 128 +               dai->platform_name = NULL;
 129 +               dai->platform_of_node = i2s_node;
 130 +           }
 131 +       }
 132 +
 133 +       ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
 134 +       if (ret)
 135 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
 136 +
 137 +       return ret;
 138 +}
 139 +
 140 +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
 141 +{
 142 +       return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
 143 +}
 144 +
 145 +static const struct of_device_id snd_rpi_hifiberry_dac_of_match[] = {
 146 +       { .compatible = "hifiberry,hifiberry-dac", },
 147 +       {},
 148 +};
 149 +MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dac_of_match);
 150 +
 151 +static struct platform_driver snd_rpi_hifiberry_dac_driver = {
 152 +        .driver = {
 153 +                .name   = "snd-hifiberry-dac",
 154 +                .owner  = THIS_MODULE,
 155 +               .of_match_table = snd_rpi_hifiberry_dac_of_match,
 156 +        },
 157 +        .probe          = snd_rpi_hifiberry_dac_probe,
 158 +        .remove         = snd_rpi_hifiberry_dac_remove,
 159 +};
 160 +
 161 +module_platform_driver(snd_rpi_hifiberry_dac_driver);
 162 +
 163 +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 164 +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
 165 +MODULE_LICENSE("GPL v2");