sound/soc/tegra/tegra_wm9712.c

   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
  34 struct tegra_wm9712 {
  35         struct platform_device *codec;
  36 };
  37
  38 static 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
  44 static 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
  55 static 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
  64 static 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
  75 static 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
 131 codec_unregister:
 132         platform_device_del(machine->codec);
 133 codec_put:
 134         platform_device_put(machine->codec);
 135         return ret;
 136 }
 137
 138 static 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
 150 static const struct of_device_id tegra_wm9712_of_match[] = {
 151         { .compatible = "nvidia,tegra-audio-wm9712", },
 152         {},
 153 };
 154
 155 static 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 };
 165 module_platform_driver(tegra_wm9712_driver);
 166
 167 MODULE_AUTHOR("Lucas Stach");
 168 MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
 169 MODULE_LICENSE("GPL v2");
 170 MODULE_ALIAS("platform:" DRV_NAME);
 171 MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);