sound/soc/bcm/dionaudio_loco-v2.c

   1 /*
   2  * ASoC Driver for Dion Audio LOCO-V2 DAC-AMP
   3  *
   4  * Author:      Miquel Blauw <info@dionaudio.nl>
   5  *              Copyright 2017
   6  *
   7  * Based on the software of the RPi-DAC writen by Florian Meier
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/jack.h>
  27
  28 static bool digital_gain_0db_limit = true;
  29
  30 static int snd_rpi_dionaudio_loco_v2_init(struct snd_soc_pcm_runtime *rtd)
  31 {
  32         if (digital_gain_0db_limit) {
  33                 int ret;
  34                 struct snd_soc_card *card = rtd->card;
  35
  36                 ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
  37                 if (ret < 0)
  38                         dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
  39         }
  40
  41         return 0;
  42 }
  43
  44 SND_SOC_DAILINK_DEFS(dionaudio_loco_v2,
  45         DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
  46         DAILINK_COMP_ARRAY(COMP_CODEC("pcm512x.1-004d", "pcm512x-hifi")),
  47         DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
  48
  49 static struct snd_soc_dai_link snd_rpi_dionaudio_loco_v2_dai[] = {
  50 {
  51         .name           = "DionAudio LOCO-V2",
  52         .stream_name    = "DionAudio LOCO-V2 DAC-AMP",
  53         .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  54                           SND_SOC_DAIFMT_CBS_CFS,
  55         .init           = snd_rpi_dionaudio_loco_v2_init,
  56         SND_SOC_DAILINK_REG(dionaudio_loco_v2),
  57 },};
  58
  59 /* audio machine driver */
  60 static struct snd_soc_card snd_rpi_dionaudio_loco_v2 = {
  61         .name         = "Dion Audio LOCO-V2",
  62         .dai_link     = snd_rpi_dionaudio_loco_v2_dai,
  63         .num_links    = ARRAY_SIZE(snd_rpi_dionaudio_loco_v2_dai),
  64 };
  65
  66 static int snd_rpi_dionaudio_loco_v2_probe(struct platform_device *pdev)
  67 {
  68         int ret = 0;
  69
  70         snd_rpi_dionaudio_loco_v2.dev = &pdev->dev;
  71
  72         if (pdev->dev.of_node) {
  73                 struct device_node *i2s_node;
  74                 struct snd_soc_dai_link *dai =
  75                                         &snd_rpi_dionaudio_loco_v2_dai[0];
  76
  77                 i2s_node = of_parse_phandle(pdev->dev.of_node,
  78                                             "i2s-controller", 0);
  79                 if (i2s_node) {
  80                         dai->cpus->dai_name = NULL;
  81                         dai->cpus->of_node = i2s_node;
  82                         dai->platforms->name = NULL;
  83                         dai->platforms->of_node = i2s_node;
  84                 }
  85
  86                 digital_gain_0db_limit = !of_property_read_bool(
  87                         pdev->dev.of_node, "dionaudio,24db_digital_gain");
  88         }
  89
  90         ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_dionaudio_loco_v2);
  91         if (ret)
  92                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  93                         ret);
  94
  95         return ret;
  96 }
  97
  98 static const struct of_device_id dionaudio_of_match[] = {
  99         { .compatible = "dionaudio,dionaudio-loco-v2", },
 100         {},
 101 };
 102 MODULE_DEVICE_TABLE(of, dionaudio_of_match);
 103
 104 static struct platform_driver snd_rpi_dionaudio_loco_v2_driver = {
 105         .driver = {
 106                 .name   = "snd-rpi-dionaudio-loco-v2",
 107                 .owner  = THIS_MODULE,
 108                 .of_match_table = dionaudio_of_match,
 109         },
 110         .probe          = snd_rpi_dionaudio_loco_v2_probe,
 111 };
 112
 113 module_platform_driver(snd_rpi_dionaudio_loco_v2_driver);
 114
 115 MODULE_AUTHOR("Miquel Blauw <info@dionaudio.nl>");
 116 MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO-V2");
 117 MODULE_LICENSE("GPL v2");