target/linux/brcm2708/patches-4.1/0037-ASoC-Add-support-for-HifiBerry-DAC.patch

   1 From 2c73e8800199fad97e5a23897b490bdea01a37e0 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 037/222] 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 --- a/sound/soc/bcm/Kconfig
  19 +++ b/sound/soc/bcm/Kconfig
  20 @@ -18,3 +18,10 @@ config SND_BCM2708_SOC_I2S
  21           Say Y or M if you want to add support for codecs attached to
  22           the BCM2708 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 @@ -7,3 +7,8 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd
  34  snd-soc-bcm2708-i2s-objs := bcm2708-i2s.o
  35
  36  obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
  37 +
  38 +# BCM2708 Machine Support
  39 +snd-soc-hifiberry-dac-objs := hifiberry_dac.o
  40 +
  41 +obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
  42 --- /dev/null
  43 +++ b/sound/soc/bcm/hifiberry_dac.c
  44 @@ -0,0 +1,100 @@
  45 +/*
  46 + * ASoC Driver for HifiBerry DAC
  47 + *
  48 + * Author:     Florian Meier <florian.meier@koalo.de>
  49 + *             Copyright 2013
  50 + *
  51 + * This program is free software; you can redistribute it and/or
  52 + * modify it under the terms of the GNU General Public License
  53 + * version 2 as published by the Free Software Foundation.
  54 + *
  55 + * This program is distributed in the hope that it will be useful, but
  56 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  57 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  58 + * General Public License for more details.
  59 + */
  60 +
  61 +#include <linux/module.h>
  62 +#include <linux/platform_device.h>
  63 +
  64 +#include <sound/core.h>
  65 +#include <sound/pcm.h>
  66 +#include <sound/pcm_params.h>
  67 +#include <sound/soc.h>
  68 +#include <sound/jack.h>
  69 +
  70 +static int snd_rpi_hifiberry_dac_init(struct snd_soc_pcm_runtime *rtd)
  71 +{
  72 +       return 0;
  73 +}
  74 +
  75 +static int snd_rpi_hifiberry_dac_hw_params(struct snd_pcm_substream *substream,
  76 +                                      struct snd_pcm_hw_params *params)
  77 +{
  78 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  79 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  80 +
  81 +       unsigned int sample_bits =
  82 +               snd_pcm_format_physical_width(params_format(params));
  83 +
  84 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
  85 +}
  86 +
  87 +/* machine stream operations */
  88 +static struct snd_soc_ops snd_rpi_hifiberry_dac_ops = {
  89 +       .hw_params = snd_rpi_hifiberry_dac_hw_params,
  90 +};
  91 +
  92 +static struct snd_soc_dai_link snd_rpi_hifiberry_dac_dai[] = {
  93 +{
  94 +       .name           = "HifiBerry DAC",
  95 +       .stream_name    = "HifiBerry DAC HiFi",
  96 +       .cpu_dai_name   = "bcm2708-i2s.0",
  97 +       .codec_dai_name = "pcm5102a-hifi",
  98 +       .platform_name  = "bcm2708-i2s.0",
  99 +       .codec_name     = "pcm5102a-codec",
 100 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 101 +                               SND_SOC_DAIFMT_CBS_CFS,
 102 +       .ops            = &snd_rpi_hifiberry_dac_ops,
 103 +       .init           = snd_rpi_hifiberry_dac_init,
 104 +},
 105 +};
 106 +
 107 +/* audio machine driver */
 108 +static struct snd_soc_card snd_rpi_hifiberry_dac = {
 109 +       .name         = "snd_rpi_hifiberry_dac",
 110 +       .dai_link     = snd_rpi_hifiberry_dac_dai,
 111 +       .num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dac_dai),
 112 +};
 113 +
 114 +static int snd_rpi_hifiberry_dac_probe(struct platform_device *pdev)
 115 +{
 116 +       int ret = 0;
 117 +
 118 +       snd_rpi_hifiberry_dac.dev = &pdev->dev;
 119 +       ret = snd_soc_register_card(&snd_rpi_hifiberry_dac);
 120 +       if (ret)
 121 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
 122 +
 123 +       return ret;
 124 +}
 125 +
 126 +static int snd_rpi_hifiberry_dac_remove(struct platform_device *pdev)
 127 +{
 128 +       return snd_soc_unregister_card(&snd_rpi_hifiberry_dac);
 129 +}
 130 +
 131 +static struct platform_driver snd_rpi_hifiberry_dac_driver = {
 132 +        .driver = {
 133 +                .name   = "snd-hifiberry-dac",
 134 +                .owner  = THIS_MODULE,
 135 +        },
 136 +        .probe          = snd_rpi_hifiberry_dac_probe,
 137 +        .remove         = snd_rpi_hifiberry_dac_remove,
 138 +};
 139 +
 140 +module_platform_driver(snd_rpi_hifiberry_dac_driver);
 141 +
 142 +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 143 +MODULE_DESCRIPTION("ASoC Driver for HifiBerry DAC");
 144 +MODULE_LICENSE("GPL v2");