target/linux/brcm2708/patches-3.14/0038-ASoC-Add-support-for-HifiBerry-DAC.patch

   1 From 674e7cb3c8707e66cabe7adffca58fd504c451d0 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 38/54] 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        |   5 +++
  14  sound/soc/bcm/hifiberry_dac.c | 100 ++++++++++++++++++++++++++++++++++++++++++
  15  3 files changed, 112 insertions(+)
  16  create mode 100644 sound/soc/bcm/hifiberry_dac.c
  17
  18 diff --git a/sound/soc/bcm/Kconfig b/sound/soc/bcm/Kconfig
  19 index 7e5b945..b36a62f 100644
  20 --- a/sound/soc/bcm/Kconfig
  21 +++ b/sound/soc/bcm/Kconfig
  22 @@ -18,3 +18,10 @@ config SND_BCM2708_SOC_I2S
  23           Say Y or M if you want to add support for codecs attached to
  24           the BCM2708 I2S interface. You will also need
  25           to select the audio interfaces to support below.
  26 +
  27 +config SND_BCM2708_SOC_HIFIBERRY_DAC
  28 +        tristate "Support for HifiBerry DAC"
  29 +        depends on SND_BCM2708_SOC_I2S
  30 +        select SND_SOC_PCM5102A
  31 +        help
  32 +         Say Y or M if you want to add support for HifiBerry DAC.
  33 diff --git a/sound/soc/bcm/Makefile b/sound/soc/bcm/Makefile
  34 index f8bbe1f..be90a49cb 100644
  35 --- a/sound/soc/bcm/Makefile
  36 +++ b/sound/soc/bcm/Makefile
  37 @@ -7,3 +7,8 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
  38  snd-soc-bcm2708-i2s-objs := bcm2708-i2s.o
  39
  40  obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
  41 +
  42 +# BCM2708 Machine Support
  43 +snd-soc-hifiberry-dac-objs := hifiberry_dac.o
  44 +
  45 +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
  46 diff --git a/sound/soc/bcm/hifiberry_dac.c b/sound/soc/bcm/hifiberry_dac.c
  47 new file mode 100644
  48 index 0000000..4b70b45
  49 --- /dev/null
  50 +++ b/sound/soc/bcm/hifiberry_dac.c
  51 @@ -0,0 +1,100 @@
  52 +/*
  53 + * ASoC Driver for HifiBerry DAC
  54 + *
  55 + * Author:     Florian Meier <florian.meier@koalo.de>
  56 + *             Copyright 2013
  57 + *
  58 + * This program is free software; you can redistribute it and/or
  59 + * modify it under the terms of the GNU General Public License
  60 + * version 2 as published by the Free Software Foundation.
  61 + *
  62 + * This program is distributed in the hope that it will be useful, but
  63 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  64 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  65 + * General Public License for more details.
  66 + */
  67 +
  68 +#include <linux/module.h>
  69 +#include <linux/platform_device.h>
  70 +
  71 +#include <sound/core.h>
  72 +#include <sound/pcm.h>
  73 +#include <sound/pcm_params.h>
  74 +#include <sound/soc.h>
  75 +#include <sound/jack.h>
  76 +
  77 +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
  78 +{
  79 +       return 0;
  80 +}
  81 +
  82 +static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,
  83 +                                      struct snd_pcm_hw_params *params)
  84 +{
  85 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  86 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  87 +
  88 +       unsigned int sample_bits =
  89 +               snd_pcm_format_physical_width(params_format(params));
  90 +
  91 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
  92 +}
  93 +
  94 +/* machine stream operations */
  95 +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
  96 +       .hw_params = snd_rpi_hifiberry_dac_hw_params,
  97 +};
  98 +
  99 +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
 100 +{
 101 +       .name           = "HifiBerry DAC",
 102 +       .stream_name    = "HifiBerry DAC HiFi",
 103 +       .cpu_dai_name   = "bcm2708-i2s.0",
 104 +       .codec_dai_name = "pcm5102a-hifi",
 105 +       .platform_name  = "bcm2708-i2s.0",
 106 +       .codec_name     = "pcm5102a-codec",
 107 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 108 +                               SND_SOC_DAIFMT_CBS_CFS,
 109 +       .ops            = &snd_rpi_hifiberry_dac_ops,
 110 +       .init           = snd_rpi_hifiberry_dac_init,
 111 +},
 112 +};
 113 +
 114 +/* audio machine driver */
 115 +static struct snd_soc_card snd_rpi_hifiberry_dac = {
 116 +       .name         = "snd_rpi_hifiberry_dac",
 117 +       .dai_link     = snd_rpi_hifiberry_dac_dai,
 118 +       .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
 119 +};
 120 +
 121 +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
 122 +{
 123 +       int ret = 0;
 124 +
 125 +       snd_rpi_hifiberry_dac.dev = &pdev->dev;
 126 +       ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
 127 +       if (ret)
 128 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
 129 +
 130 +       return ret;
 131 +}
 132 +
 133 +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
 134 +{
 135 +       return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
 136 +}
 137 +
 138 +static struct platform_driver snd_rpi_hifiberry_dac_driver = {
 139 +        .driver = {
 140 +                .name   = "snd-hifiberry-dac",
 141 +                .owner  = THIS_MODULE,
 142 +        },
 143 +        .probe          = snd_rpi_hifiberry_dac_probe,
 144 +        .remove         = snd_rpi_hifiberry_dac_remove,
 145 +};
 146 +
 147 +module_platform_driver(snd_rpi_hifiberry_dac_driver);
 148 +
 149 +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 150 +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
 151 +MODULE_LICENSE("GPL v2");
 152 --
 153 1.9.1
 154