target/linux/bcm27xx/patches-5.4/950-0063-Add-driver-for-rpi-proto.patch

   1 From b3cf65c5d12ff3bd52843a35dc912a705371d5b6 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 ASoC: rpi-proto: use modern dai_link style
  18
  19 Signed-off-by: Hui Wang <hui.wang@canonical.com>
  20 ---
  21  sound/soc/bcm/rpi-proto.c | 147 ++++++++++++++++++++++++++++++++++++++
  22  1 file changed, 147 insertions(+)
  23  create mode 100644 sound/soc/bcm/rpi-proto.c
  24
  25 --- /dev/null
  26 +++ b/sound/soc/bcm/rpi-proto.c
  27 @@ -0,0 +1,147 @@
  28 +/*
  29 + * ASoC driver for PROTO AudioCODEC (with a WM8731)
  30 + * connected to a Raspberry Pi
  31 + *
  32 + * Author:      Florian Meier, <koalo@koalo.de>
  33 + *           Copyright 2013
  34 + *
  35 + * This program is free software; you can redistribute it and/or modify
  36 + * it under the terms of the GNU General Public License version 2 as
  37 + * published by the Free Software Foundation.
  38 + */
  39 +
  40 +#include <linux/module.h>
  41 +#include <linux/platform_device.h>
  42 +
  43 +#include <sound/core.h>
  44 +#include <sound/pcm.h>
  45 +#include <sound/soc.h>
  46 +#include <sound/jack.h>
  47 +
  48 +#include "../codecs/wm8731.h"
  49 +
  50 +static const unsigned int wm8731_rates_12288000[] = {
  51 +       8000, 32000, 48000, 96000,
  52 +};
  53 +
  54 +static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
  55 +       .list = wm8731_rates_12288000,
  56 +       .count = ARRAY_SIZE(wm8731_rates_12288000),
  57 +};
  58 +
  59 +static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
  60 +{
  61 +       /* Setup constraints, because there is a 12.288 MHz XTAL on the board */
  62 +       snd_pcm_hw_constraint_list(substream->runtime, 0,
  63 +                               SNDRV_PCM_HW_PARAM_RATE,
  64 +                               &wm8731_constraints_12288000);
  65 +       return 0;
  66 +}
  67 +
  68 +static int snd_rpi_proto_hw_params(struct snd_pcm_substream *substream,
  69 +                                      struct snd_pcm_hw_params *params)
  70 +{
  71 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
  72 +       struct snd_soc_dai *codec_dai = rtd->codec_dai;
  73 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  74 +       int sysclk = 12288000; /* This is fixed on this board */
  75 +
  76 +       /* Set proto bclk */
  77 +       int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
  78 +       if (ret < 0){
  79 +               dev_err(rtd->card->dev,
  80 +                               "Failed to set BCLK ratio %d\n", ret);
  81 +               return ret;
  82 +       }
  83 +
  84 +       /* Set proto sysclk */
  85 +       ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
  86 +                       sysclk, SND_SOC_CLOCK_IN);
  87 +       if (ret < 0) {
  88 +               dev_err(rtd->card->dev,
  89 +                               "Failed to set WM8731 SYSCLK: %d\n", ret);
  90 +               return ret;
  91 +       }
  92 +
  93 +       return 0;
  94 +}
  95 +
  96 +/* machine stream operations */
  97 +static struct snd_soc_ops snd_rpi_proto_ops = {
  98 +       .startup = snd_rpi_proto_startup,
  99 +       .hw_params = snd_rpi_proto_hw_params,
 100 +};
 101 +
 102 +SND_SOC_DAILINK_DEFS(rpi_proto,
 103 +       DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
 104 +       DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.1-001a", "wm8731-hifi")),
 105 +       DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
 106 +
 107 +static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
 108 +{
 109 +       .name           = "WM8731",
 110 +       .stream_name    = "WM8731 HiFi",
 111 +       .dai_fmt        = SND_SOC_DAIFMT_I2S
 112 +                               | SND_SOC_DAIFMT_NB_NF
 113 +                               | SND_SOC_DAIFMT_CBM_CFM,
 114 +       .ops            = &snd_rpi_proto_ops,
 115 +       SND_SOC_DAILINK_REG(rpi_proto),
 116 +},
 117 +};
 118 +
 119 +/* audio machine driver */
 120 +static struct snd_soc_card snd_rpi_proto = {
 121 +       .name           = "snd_rpi_proto",
 122 +       .owner          = THIS_MODULE,
 123 +       .dai_link       = snd_rpi_proto_dai,
 124 +       .num_links      = ARRAY_SIZE(snd_rpi_proto_dai),
 125 +};
 126 +
 127 +static int snd_rpi_proto_probe(struct platform_device *pdev)
 128 +{
 129 +       int ret = 0;
 130 +
 131 +       snd_rpi_proto.dev = &pdev->dev;
 132 +
 133 +       if (pdev->dev.of_node) {
 134 +               struct device_node *i2s_node;
 135 +               struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
 136 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 137 +                                           "i2s-controller", 0);
 138 +
 139 +               if (i2s_node) {
 140 +                       dai->cpus->dai_name = NULL;
 141 +                       dai->cpus->of_node = i2s_node;
 142 +                       dai->platforms->name = NULL;
 143 +                       dai->platforms->of_node = i2s_node;
 144 +               }
 145 +       }
 146 +
 147 +       ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_proto);
 148 +       if (ret && ret != -EPROBE_DEFER)
 149 +               dev_err(&pdev->dev,
 150 +                               "snd_soc_register_card() failed: %d\n", ret);
 151 +
 152 +       return ret;
 153 +}
 154 +
 155 +static const struct of_device_id snd_rpi_proto_of_match[] = {
 156 +       { .compatible = "rpi,rpi-proto", },
 157 +       {},
 158 +};
 159 +MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);
 160 +
 161 +static struct platform_driver snd_rpi_proto_driver = {
 162 +       .driver = {
 163 +               .name   = "snd-rpi-proto",
 164 +               .owner  = THIS_MODULE,
 165 +               .of_match_table = snd_rpi_proto_of_match,
 166 +       },
 167 +       .probe    = snd_rpi_proto_probe,
 168 +};
 169 +
 170 +module_platform_driver(snd_rpi_proto_driver);
 171 +
 172 +MODULE_AUTHOR("Florian Meier");
 173 +MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
 174 +MODULE_LICENSE("GPL");