target/linux/brcm2708/patches-4.1/0044-Add-IQaudIO-Sound-Card-support-for-Raspberry-Pi.patch

   1 From f8fb55caae97e04ab68a955eb8946dbee37cd6fe Mon Sep 17 00:00:00 2001
   2 From: Gordon Garrity <gordon@iqaudio.com>
   3 Date: Sat, 8 Mar 2014 16:56:57 +0000
   4 Subject: [PATCH 044/222] Add IQaudIO Sound Card support for Raspberry Pi
   5
   6 Set a limit of 0dB on Digital Volume Control
   7
   8 The main volume control in the PCM512x DAC has a range up to
   9 +24dB. This is dangerously loud and can potentially cause massive
  10 clipping in the output stages. Therefore this sets a sensible
  11 limit of 0dB for this control.
  12 ---
  13  arch/arm/mach-bcm2708/bcm2708.c |  21 ++++++++
  14  sound/soc/bcm/Kconfig           |   7 +++
  15  sound/soc/bcm/Makefile          |   2 +
  16  sound/soc/bcm/iqaudio-dac.c     | 117 ++++++++++++++++++++++++++++++++++++++++
  17  4 files changed, 147 insertions(+)
  18  create mode 100644 sound/soc/bcm/iqaudio-dac.c
  19
  20 --- a/arch/arm/mach-bcm2708/bcm2708.c
  21 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  22 @@ -681,6 +681,22 @@ static struct platform_device snd_pcm179
  23  };
  24  #endif
  25
  26 +
  27 +#if defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) || defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC_MODULE)
  28 +static struct platform_device snd_rpi_iqaudio_dac_device = {
  29 +        .name = "snd-rpi-iqaudio-dac",
  30 +        .id = 0,
  31 +        .num_resources = 0,
  32 +};
  33 +
  34 +// Use the actual device name rather than generic driver name
  35 +static struct i2c_board_info __initdata snd_pcm512x_i2c_devices[] = {
  36 +       {
  37 +               I2C_BOARD_INFO("pcm5122", 0x4c)
  38 +       },
  39 +};
  40 +#endif
  41 +
  42  int __init bcm_register_device(struct platform_device *pdev)
  43  {
  44         int ret;
  45 @@ -864,6 +880,11 @@ void __init bcm2708_init(void)
  46          bcm_register_device_dt(&snd_pcm1794a_codec_device);
  47  #endif
  48
  49 +#if defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) || defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC_MODULE)
  50 +        bcm_register_device_dt(&snd_rpi_iqaudio_dac_device);
  51 +        i2c_register_board_info_dt(1, snd_pcm512x_i2c_devices, ARRAY_SIZE(snd_pcm512x_i2c_devices));
  52 +#endif
  53 +
  54         if (!use_dt) {
  55                 for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
  56                         struct amba_device *d = amba_devs[i];
  57 --- a/sound/soc/bcm/Kconfig
  58 +++ b/sound/soc/bcm/Kconfig
  59 @@ -39,3 +39,10 @@ config SND_BCM2708_SOC_RPI_DAC
  60          select SND_SOC_PCM1794A
  61          help
  62           Say Y or M if you want to add support for RPi-DAC.
  63 +
  64 +config SND_BCM2708_SOC_IQAUDIO_DAC
  65 +       tristate "Support for IQaudIO-DAC"
  66 +       depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  67 +       select SND_SOC_PCM512x_I2C
  68 +       help
  69 +         Say Y or M if you want to add support for IQaudIO-DAC.
  70 --- a/sound/soc/bcm/Makefile
  71 +++ b/sound/soc/bcm/Makefile
  72 @@ -12,7 +12,9 @@ obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd
  73  snd-soc-hifiberry-dac-objs := hifiberry_dac.o
  74  snd-soc-hifiberry-digi-objs := hifiberry_digi.o
  75  snd-soc-rpi-dac-objs := rpi-dac.o
  76 +snd-soc-iqaudio-dac-objs := iqaudio-dac.o
  77
  78  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
  79  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
  80  obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
  81 +obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
  82 --- /dev/null
  83 +++ b/sound/soc/bcm/iqaudio-dac.c
  84 @@ -0,0 +1,117 @@
  85 +/*
  86 + * ASoC Driver for IQaudIO DAC
  87 + *
  88 + * Author:     Florian Meier <florian.meier@koalo.de>
  89 + *             Copyright 2013
  90 + *
  91 + * This program is free software; you can redistribute it and/or
  92 + * modify it under the terms of the GNU General Public License
  93 + * version 2 as published by the Free Software Foundation.
  94 + *
  95 + * This program is distributed in the hope that it will be useful, but
  96 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  97 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  98 + * General Public License for more details.
  99 + */
 100 +
 101 +#include <linux/module.h>
 102 +#include <linux/platform_device.h>
 103 +
 104 +#include <sound/core.h>
 105 +#include <sound/pcm.h>
 106 +#include <sound/pcm_params.h>
 107 +#include <sound/soc.h>
 108 +#include <sound/jack.h>
 109 +
 110 +static int snd_rpi_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd)
 111 +{
 112 +       int ret;
 113 +       struct snd_soc_card *card = rtd->card;
 114 +       struct snd_soc_codec *codec = rtd->codec;
 115 +
 116 +       ret = snd_soc_limit_volume(codec, "Digital Playback Volume", 207);
 117 +       if (ret < 0)
 118 +               dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
 119 +
 120 +       return 0;
 121 +}
 122 +
 123 +static int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream,
 124 +                                      struct snd_pcm_hw_params *params)
 125 +{
 126 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 127 +// NOT USED    struct snd_soc_dai *codec_dai = rtd->codec_dai;
 128 +// NOT USED    struct snd_soc_codec *codec = rtd->codec;
 129 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 130 +
 131 +       unsigned int sample_bits =
 132 +               snd_pcm_format_physical_width(params_format(params));
 133 +
 134 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
 135 +}
 136 +
 137 +/* machine stream operations */
 138 +static struct snd_soc_ops snd_rpi_iqaudio_dac_ops = {
 139 +       .hw_params = snd_rpi_iqaudio_dac_hw_params,
 140 +};
 141 +
 142 +static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = {
 143 +{
 144 +       .name           = "IQaudIO DAC",
 145 +       .stream_name    = "IQaudIO DAC HiFi",
 146 +       .cpu_dai_name   = "bcm2708-i2s.0",
 147 +       .codec_dai_name = "pcm512x-hifi",
 148 +       .platform_name  = "bcm2708-i2s.0",
 149 +       .codec_name     = "pcm512x.1-004c",
 150 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 151 +                               SND_SOC_DAIFMT_CBS_CFS,
 152 +       .ops            = &snd_rpi_iqaudio_dac_ops,
 153 +       .init           = snd_rpi_iqaudio_dac_init,
 154 +},
 155 +};
 156 +
 157 +/* audio machine driver */
 158 +static struct snd_soc_card snd_rpi_iqaudio_dac = {
 159 +       .name         = "IQaudIODAC",
 160 +       .dai_link     = snd_rpi_iqaudio_dac_dai,
 161 +       .num_links    = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
 162 +};
 163 +
 164 +static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)
 165 +{
 166 +       int ret = 0;
 167 +
 168 +       snd_rpi_iqaudio_dac.dev = &pdev->dev;
 169 +       ret = snd_soc_register_card(&snd_rpi_iqaudio_dac);
 170 +       if (ret)
 171 +               dev_err(&pdev->dev,
 172 +                       "snd_soc_register_card() failed: %d\n", ret);
 173 +
 174 +       return ret;
 175 +}
 176 +
 177 +static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev)
 178 +{
 179 +       return snd_soc_unregister_card(&snd_rpi_iqaudio_dac);
 180 +}
 181 +
 182 +static const struct of_device_id iqaudio_of_match[] = {
 183 +       { .compatible = "iqaudio,iqaudio-dac", },
 184 +       {},
 185 +};
 186 +
 187 +static struct platform_driver snd_rpi_iqaudio_dac_driver = {
 188 +       .driver = {
 189 +               .name   = "snd-rpi-iqaudio-dac",
 190 +               .owner  = THIS_MODULE,
 191 +               .of_match_table = iqaudio_of_match,
 192 +       },
 193 +       .probe          = snd_rpi_iqaudio_dac_probe,
 194 +       .remove         = snd_rpi_iqaudio_dac_remove,
 195 +};
 196 +
 197 +module_platform_driver(snd_rpi_iqaudio_dac_driver);
 198 +
 199 +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 200 +MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC");
 201 +MODULE_LICENSE("GPL v2");