LXR linux/sound/soc/tegra/tegra

   1/*
   2 * tegra20_wm9712.c - Tegra machine ASoC driver for boards using WM9712 codec.
   3 *
   4 * Copyright 2012 Lucas Stach <dev@lynxeye.de>
   5 *
   6 * Partly based on code copyright/by:
   7 * Copyright 2011,2012 Toradex Inc.
   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
  20#include <linux/module.h>
  21#include <linux/platform_device.h>
  22#include <linux/slab.h>
  23#include <linux/gpio.h>
  24#include <linux/of_gpio.h>
  25
  26#include <sound/core.h>
  27#include <sound/jack.h>
  28#include <sound/pcm.h>
  29#include <sound/pcm_params.h>
  30#include <sound/soc.h>
  31
  32#define DRV_NAME "tegra-snd-wm9712"
  33
  34struct tegra_wm9712 {
  35        struct platform_device *codec;
  36};
  37
  38static const struct snd_soc_dapm_widget tegra_wm9712_dapm_widgets[] = {
  39        SND_SOC_DAPM_HP("Headphone", NULL),
  40        SND_SOC_DAPM_LINE("LineIn", NULL),
  41        SND_SOC_DAPM_MIC("Mic", NULL),
  42};
  43
  44static int tegra_wm9712_init(struct snd_soc_pcm_runtime *rtd)
  45{
  46        struct snd_soc_dai *codec_dai = rtd->codec_dai;
  47        struct snd_soc_codec *codec = codec_dai->codec;
  48        struct snd_soc_dapm_context *dapm = &codec->dapm;
  49
  50        snd_soc_dapm_force_enable_pin(dapm, "Mic Bias");
  51
  52        return snd_soc_dapm_sync(dapm);
  53}
  54
  55static struct snd_soc_dai_link tegra_wm9712_dai = {
  56        .name = "AC97 HiFi",
  57        .stream_name = "AC97 HiFi",
  58        .cpu_dai_name = "tegra20-ac97",
  59        .codec_dai_name = "wm9712-hifi",
  60        .codec_name = "wm9712-codec",
  61        .init = tegra_wm9712_init,
  62};
  63
  64static struct snd_soc_card snd_soc_tegra_wm9712 = {
  65        .name = "tegra-wm9712",
  66        .owner = THIS_MODULE,
  67        .dai_link = &tegra_wm9712_dai,
  68        .num_links = 1,
  69
  70        .dapm_widgets = tegra_wm9712_dapm_widgets,
  71        .num_dapm_widgets = ARRAY_SIZE(tegra_wm9712_dapm_widgets),
  72        .fully_routed = true,
  73};
  74
  75static int tegra_wm9712_driver_probe(struct platform_device *pdev)
  76{
  77        struct device_node *np = pdev->dev.of_node;
  78        struct snd_soc_card *card = &snd_soc_tegra_wm9712;
  79        struct tegra_wm9712 *machine;
  80        int ret;
  81
  82        machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm9712),
  83                               GFP_KERNEL);
  84        if (!machine) {
  85                dev_err(&pdev->dev, "Can't allocate tegra_wm9712 struct\n");
  86                return -ENOMEM;
  87        }
  88
  89        card->dev = &pdev->dev;
  90        platform_set_drvdata(pdev, card);
  91        snd_soc_card_set_drvdata(card, machine);
  92
  93        machine->codec = platform_device_alloc("wm9712-codec", -1);
  94        if (!machine->codec) {
  95                dev_err(&pdev->dev, "Can't allocate wm9712 platform device\n");
  96                return -ENOMEM;
  97        }
  98
  99        ret = platform_device_add(machine->codec);
 100        if (ret)
 101                goto codec_put;
 102
 103        ret = snd_soc_of_parse_card_name(card, "nvidia,model");
 104        if (ret)
 105                goto codec_unregister;
 106
 107        ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
 108        if (ret)
 109                goto codec_unregister;
 110
 111        tegra_wm9712_dai.cpu_of_node = of_parse_phandle(np,
 112                                       "nvidia,ac97-controller", 0);
 113        if (!tegra_wm9712_dai.cpu_of_node) {
 114                dev_err(&pdev->dev,
 115                        "Property 'nvidia,ac97-controller' missing or invalid\n");
 116                ret = -EINVAL;
 117                goto codec_unregister;
 118        }
 119
 120        tegra_wm9712_dai.platform_of_node = tegra_wm9712_dai.cpu_of_node;
 121
 122        ret = snd_soc_register_card(card);
 123        if (ret) {
 124                dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
 125                        ret);
 126                goto codec_unregister;
 127        }
 128
 129        return 0;
 130
 131codec_unregister:
 132        platform_device_del(machine->codec);
 133codec_put:
 134        platform_device_put(machine->codec);
 135        return ret;
 136}
 137
 138static int tegra_wm9712_driver_remove(struct platform_device *pdev)
 139{
 140        struct snd_soc_card *card = platform_get_drvdata(pdev);
 141        struct tegra_wm9712 *machine = snd_soc_card_get_drvdata(card);
 142
 143        snd_soc_unregister_card(card);
 144
 145        platform_device_unregister(machine->codec);
 146
 147        return 0;
 148}
 149
 150static const struct of_device_id tegra_wm9712_of_match[] = {
 151        { .compatible = "nvidia,tegra-audio-wm9712", },
 152        {},
 153};
 154
 155static struct platform_driver tegra_wm9712_driver = {
 156        .driver = {
 157                .name = DRV_NAME,
 158                .owner = THIS_MODULE,
 159                .pm = &snd_soc_pm_ops,
 160                .of_match_table = tegra_wm9712_of_match,
 161        },
 162        .probe = tegra_wm9712_driver_probe,
 163        .remove = tegra_wm9712_driver_remove,
 164};
 165module_platform_driver(tegra_wm9712_driver);
 166
 167MODULE_AUTHOR("Lucas Stach");
 168MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
 169MODULE_LICENSE("GPL v2");
 170MODULE_ALIAS("platform:" DRV_NAME);
 171MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);
 172