target/linux/brcm2708/patches-4.9/950-0075-Add-driver-for-rpi-proto.patch

   1 From b351d2ffe294c9d5e8cde9caa3a94017ecec81d9 Mon Sep 17 00:00:00 2001
   2 From: Waldemar Brodkorb <wbrodkorb@conet.de>
   3 Date: Wed, 25 Mar 2015 09:26:17 +0100
   4 Subject: [PATCH] Add driver for rpi-proto
   5
   6 Forward port of 3.10.x driver from https://github.com/koalo
   7 We are using a custom board and would like to use rpi 3.18.x
   8 kernel. Patch works fine for our embedded system.
   9
  10 URL to the audio chip:
  11 http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/
  12
  13 Playback tested with devicetree enabled.
  14
  15 Signed-off-by: Waldemar Brodkorb <wbrodkorb@conet.de>
  16 ---
  17  sound/soc/bcm/Kconfig     |   7 +++
  18  sound/soc/bcm/Makefile    |   2 +
  19  sound/soc/bcm/rpi-proto.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++
  20  3 files changed, 163 insertions(+)
  21  create mode 100644 sound/soc/bcm/rpi-proto.c
  22
  23 --- a/sound/soc/bcm/Kconfig
  24 +++ b/sound/soc/bcm/Kconfig
  25 @@ -52,6 +52,13 @@ config SND_BCM2708_SOC_RPI_DAC
  26          help
  27           Say Y or M if you want to add support for RPi-DAC.
  28
  29 +config SND_BCM2708_SOC_RPI_PROTO
  30 +       tristate "Support for Rpi-PROTO"
  31 +       depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  32 +       select SND_SOC_WM8731
  33 +       help
  34 +         Say Y or M if you want to add support for Audio Codec Board PROTO (WM8731).
  35 +
  36  config SND_BCM2708_SOC_IQAUDIO_DAC
  37         tristate "Support for IQaudIO-DAC"
  38         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  39 --- a/sound/soc/bcm/Makefile
  40 +++ b/sound/soc/bcm/Makefile
  41 @@ -14,6 +14,7 @@ snd-soc-hifiberry-dac-objs := hifiberry_
  42  snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
  43  snd-soc-hifiberry-digi-objs := hifiberry_digi.o
  44  snd-soc-rpi-dac-objs := rpi-dac.o
  45 +snd-soc-rpi-proto-objs := rpi-proto.o
  46  snd-soc-iqaudio-dac-objs := iqaudio-dac.o
  47
  48  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
  49 @@ -21,4 +22,5 @@ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_D
  50  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
  51  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
  52  obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
  53 +obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
  54  obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
  55 --- /dev/null
  56 +++ b/sound/soc/bcm/rpi-proto.c
  57 @@ -0,0 +1,154 @@
  58 +/*
  59 + * ASoC driver for PROTO AudioCODEC (with a WM8731)
  60 + * connected to a Raspberry Pi
  61 + *
  62 + * Author:      Florian Meier, <koalo@koalo.de>
  63 + *           Copyright 2013
  64 + *
  65 + * This program is free software; you can redistribute it and/or modify
  66 + * it under the terms of the GNU General Public License version 2 as
  67 + * published by the Free Software Foundation.
  68 + */
  69 +
  70 +#include <linux/module.h>
  71 +#include <linux/platform_device.h>
  72 +
  73 +#include <sound/core.h>
  74 +#include <sound/pcm.h>
  75 +#include <sound/soc.h>
  76 +#include <sound/jack.h>
  77 +
  78 +#include "../codecs/wm8731.h"
  79 +
  80 +static const unsigned int wm8731_rates_12288000[] = {
  81 +       8000, 32000, 48000, 96000,
  82 +};
  83 +
  84 +static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
  85 +       .list = wm8731_rates_12288000,
  86 +       .count = ARRAY_SIZE(wm8731_rates_12288000),
  87 +};
  88 +
  89 +static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
  90 +{
  91 +       /* Setup constraints, because there is a 12.288 MHz XTAL on the board */
  92 +       snd_pcm_hw_constraint_list(substream->runtime, 0,
  93 +                               SNDRV_PCM_HW_PARAM_RATE,
  94 +                               &wm8731_constraints_12288000);
  95 +       return 0;
  96 +}
  97 +
  98 +static int snd_rpi_proto_hw_params(struct snd_pcm_substream *substream,
  99 +                                      struct snd_pcm_hw_params *params)
 100 +{
 101 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 102 +       struct snd_soc_codec *codec = rtd->codec;
 103 +       struct snd_soc_dai *codec_dai = rtd->codec_dai;
 104 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 105 +       int sysclk = 12288000; /* This is fixed on this board */
 106 +
 107 +       /* Set proto bclk */
 108 +       int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
 109 +       if (ret < 0){
 110 +               dev_err(codec->dev,
 111 +                               "Failed to set BCLK ratio %d\n", ret);
 112 +               return ret;
 113 +       }
 114 +
 115 +       /* Set proto sysclk */
 116 +       ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
 117 +                       sysclk, SND_SOC_CLOCK_IN);
 118 +       if (ret < 0) {
 119 +               dev_err(codec->dev,
 120 +                               "Failed to set WM8731 SYSCLK: %d\n", ret);
 121 +               return ret;
 122 +       }
 123 +
 124 +       return 0;
 125 +}
 126 +
 127 +/* machine stream operations */
 128 +static struct snd_soc_ops snd_rpi_proto_ops = {
 129 +       .startup = snd_rpi_proto_startup,
 130 +       .hw_params = snd_rpi_proto_hw_params,
 131 +};
 132 +
 133 +static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
 134 +{
 135 +       .name           = "WM8731",
 136 +       .stream_name    = "WM8731 HiFi",
 137 +       .cpu_dai_name   = "bcm2708-i2s.0",
 138 +       .codec_dai_name = "wm8731-hifi",
 139 +       .platform_name  = "bcm2708-i2s.0",
 140 +       .codec_name     = "wm8731.1-001a",
 141 +       .dai_fmt        = SND_SOC_DAIFMT_I2S
 142 +                               | SND_SOC_DAIFMT_NB_NF
 143 +                               | SND_SOC_DAIFMT_CBM_CFM,
 144 +       .ops            = &snd_rpi_proto_ops,
 145 +},
 146 +};
 147 +
 148 +/* audio machine driver */
 149 +static struct snd_soc_card snd_rpi_proto = {
 150 +       .name           = "snd_rpi_proto",
 151 +       .owner          = THIS_MODULE,
 152 +       .dai_link       = snd_rpi_proto_dai,
 153 +       .num_links      = ARRAY_SIZE(snd_rpi_proto_dai),
 154 +};
 155 +
 156 +static int snd_rpi_proto_probe(struct platform_device *pdev)
 157 +{
 158 +       int ret = 0;
 159 +
 160 +       snd_rpi_proto.dev = &pdev->dev;
 161 +
 162 +       if (pdev->dev.of_node) {
 163 +               struct device_node *i2s_node;
 164 +               struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
 165 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 166 +                                           "i2s-controller", 0);
 167 +
 168 +               if (i2s_node) {
 169 +                       dai->cpu_dai_name = NULL;
 170 +                       dai->cpu_of_node = i2s_node;
 171 +                       dai->platform_name = NULL;
 172 +                       dai->platform_of_node = i2s_node;
 173 +               }
 174 +       }
 175 +
 176 +       ret = snd_soc_register_card(&snd_rpi_proto);
 177 +       if (ret) {
 178 +               dev_err(&pdev->dev,
 179 +                               "snd_soc_register_card() failed: %d\n", ret);
 180 +       }
 181 +
 182 +       return ret;
 183 +}
 184 +
 185 +
 186 +static int snd_rpi_proto_remove(struct platform_device *pdev)
 187 +{
 188 +       return snd_soc_unregister_card(&snd_rpi_proto);
 189 +}
 190 +
 191 +static const struct of_device_id snd_rpi_proto_of_match[] = {
 192 +       { .compatible = "rpi,rpi-proto", },
 193 +       {},
 194 +};
 195 +MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);
 196 +
 197 +static struct platform_driver snd_rpi_proto_driver = {
 198 +       .driver = {
 199 +               .name   = "snd-rpi-proto",
 200 +               .owner  = THIS_MODULE,
 201 +               .of_match_table = snd_rpi_proto_of_match,
 202 +       },
 203 +       .probe    = snd_rpi_proto_probe,
 204 +       .remove  = snd_rpi_proto_remove,
 205 +};
 206 +
 207 +module_platform_driver(snd_rpi_proto_driver);
 208 +
 209 +MODULE_AUTHOR("Florian Meier");
 210 +MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
 211 +MODULE_LICENSE("GPL");