target/linux/brcm2708/patches-4.9/0066-ASoC-Add-support-for-HifiBerry-DAC.patch

   1 From fe9fdf49ba81e28860e5367ea8bb9c6b1c6a0460 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         |   9 ++-
  13  sound/soc/bcm/Makefile        |   4 ++
  14  sound/soc/bcm/hifiberry_dac.c | 124 ++++++++++++++++++++++++++++++++++++++++++
  15  3 files changed, 136 insertions(+), 1 deletion(-)
  16  create mode 100644 sound/soc/bcm/hifiberry_dac.c
  17
  18 --- a/sound/soc/bcm/Kconfig
  19 +++ b/sound/soc/bcm/Kconfig
  20 @@ -15,4 +15,11 @@ config SND_SOC_CYGNUS
  21           Say Y if you want to add support for ASoC audio on Broadcom
  22           Cygnus chips (bcm958300, bcm958305, bcm911360)
  23
  24 -         If you don't know what to do here, say N.
  25 \ No newline at end of file
  26 +         If you don't know what to do here, say N.
  27 +
  28 +config SND_BCM2708_SOC_HIFIBERRY_DAC
  29 +        tristate "Support for HifiBerry DAC"
  30 +        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  31 +        select SND_SOC_PCM5102A
  32 +        help
  33 +         Say Y or M if you want to add support for HifiBerry DAC.
  34 --- a/sound/soc/bcm/Makefile
  35 +++ b/sound/soc/bcm/Makefile
  36 @@ -8,3 +8,7 @@ snd-soc-cygnus-objs := cygnus-pcm.o cygn
  37
  38  obj-$(CONFIG_SND_SOC_CYGNUS) += snd-soc-cygnus.o
  39
  40 +# BCM2708 Machine Support
  41 +snd-soc-hifiberry-dac-objs := hifiberry_dac.o
  42 +
  43 +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
  44 --- /dev/null
  45 +++ b/sound/soc/bcm/hifiberry_dac.c
  46 @@ -0,0 +1,124 @@
  47 +/*
  48 + * ASoC Driver for HifiBerry DAC
  49 + *
  50 + * Author:     Florian Meier <florian.meier@koalo.de>
  51 + *             Copyright 2013
  52 + *
  53 + * This program is free software; you can redistribute it and/or
  54 + * modify it under the terms of the GNU General Public License
  55 + * version 2 as published by the Free Software Foundation.
  56 + *
  57 + * This program is distributed in the hope that it will be useful, but
  58 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  59 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  60 + * General Public License for more details.
  61 + */
  62 +
  63 +#include <linux/module.h>
  64 +#include <linux/platform_device.h>
  65 +
  66 +#include <sound/core.h>
  67 +#include <sound/pcm.h>
  68 +#include <sound/pcm_params.h>
  69 +#include <sound/soc.h>
  70 +#include <sound/jack.h>
  71 +
  72 +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
  73 +{
  74 +       return 0;
  75 +}
  76 +
  77 +static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,
  78 +                                      struct snd_pcm_hw_params *params)
  79 +{
  80 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  81 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  82 +
  83 +       unsigned int sample_bits =
  84 +               snd_pcm_format_physical_width(params_format(params));
  85 +
  86 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
  87 +}
  88 +
  89 +/* machine stream operations */
  90 +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
  91 +       .hw_params = snd_rpi_hifiberry_dac_hw_params,
  92 +};
  93 +
  94 +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
  95 +{
  96 +       .name           = "HifiBerry DAC",
  97 +       .stream_name    = "HifiBerry DAC HiFi",
  98 +       .cpu_dai_name   = "bcm2708-i2s.0",
  99 +       .codec_dai_name = "pcm5102a-hifi",
 100 +       .platform_name  = "bcm2708-i2s.0",
 101 +       .codec_name     = "pcm5102a-codec",
 102 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 103 +                               SND_SOC_DAIFMT_CBS_CFS,
 104 +       .ops            = &snd_rpi_hifiberry_dac_ops,
 105 +       .init           = snd_rpi_hifiberry_dac_init,
 106 +},
 107 +};
 108 +
 109 +/* audio machine driver */
 110 +static struct snd_soc_card snd_rpi_hifiberry_dac = {
 111 +       .name         = "snd_rpi_hifiberry_dac",
 112 +       .driver_name  = "HifiberryDac",
 113 +       .owner        = THIS_MODULE,
 114 +       .dai_link     = snd_rpi_hifiberry_dac_dai,
 115 +       .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
 116 +};
 117 +
 118 +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
 119 +{
 120 +       int ret = 0;
 121 +
 122 +       snd_rpi_hifiberry_dac.dev = &pdev->dev;
 123 +
 124 +       if (pdev->dev.of_node) {
 125 +           struct device_node *i2s_node;
 126 +           struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_dac_dai[0];
 127 +           i2s_node = of_parse_phandle(pdev->dev.of_node,
 128 +                                       "i2s-controller", 0);
 129 +
 130 +           if (i2s_node) {
 131 +               dai->cpu_dai_name = NULL;
 132 +               dai->cpu_of_node = i2s_node;
 133 +               dai->platform_name = NULL;
 134 +               dai->platform_of_node = i2s_node;
 135 +           }
 136 +       }
 137 +
 138 +       ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
 139 +       if (ret)
 140 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
 141 +
 142 +       return ret;
 143 +}
 144 +
 145 +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
 146 +{
 147 +       return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
 148 +}
 149 +
 150 +static const struct of_device_id snd_rpi_hifiberry_dac_of_match[] = {
 151 +       { .compatible = "hifiberry,hifiberry-dac", },
 152 +       {},
 153 +};
 154 +MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dac_of_match);
 155 +
 156 +static struct platform_driver snd_rpi_hifiberry_dac_driver = {
 157 +        .driver = {
 158 +                .name   = "snd-hifiberry-dac",
 159 +                .owner  = THIS_MODULE,
 160 +               .of_match_table = snd_rpi_hifiberry_dac_of_match,
 161 +        },
 162 +        .probe          = snd_rpi_hifiberry_dac_probe,
 163 +        .remove         = snd_rpi_hifiberry_dac_remove,
 164 +};
 165 +
 166 +module_platform_driver(snd_rpi_hifiberry_dac_driver);
 167 +
 168 +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 169 +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
 170 +MODULE_LICENSE("GPL v2");