sound/soc/codecs/dio2125.c

   1 /*
   2  * Copyright (c) 2017 BayLibre, SAS.
   3  * Author: Jerome Brunet <jbrunet@baylibre.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  * The full GNU General Public License is included in this distribution
  17  * in the file called COPYING.
  18  */
  19
  20 #include <linux/gpio/consumer.h>
  21 #include <linux/module.h>
  22 #include <sound/soc.h>
  23
  24 #define DRV_NAME "dio2125"
  25
  26 struct dio2125 {
  27         struct gpio_desc *gpiod_enable;
  28 };
  29
  30 static int drv_event(struct snd_soc_dapm_widget *w,
  31                      struct snd_kcontrol *control, int event)
  32 {
  33         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  34         struct dio2125 *priv = snd_soc_component_get_drvdata(c);
  35         int val;
  36
  37         switch (event) {
  38         case SND_SOC_DAPM_POST_PMU:
  39                 val = 1;
  40                 break;
  41         case SND_SOC_DAPM_PRE_PMD:
  42                 val = 0;
  43                 break;
  44         default:
  45                 WARN(1, "Unexpected event");
  46                 return -EINVAL;
  47         }
  48
  49         gpiod_set_value_cansleep(priv->gpiod_enable, val);
  50
  51         return 0;
  52 }
  53
  54 static const struct snd_soc_dapm_widget dio2125_dapm_widgets[] = {
  55         SND_SOC_DAPM_INPUT("INL"),
  56         SND_SOC_DAPM_INPUT("INR"),
  57         SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
  58                                (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
  59         SND_SOC_DAPM_OUTPUT("OUTL"),
  60         SND_SOC_DAPM_OUTPUT("OUTR"),
  61 };
  62
  63 static const struct snd_soc_dapm_route dio2125_dapm_routes[] = {
  64         { "DRV", NULL, "INL" },
  65         { "DRV", NULL, "INR" },
  66         { "OUTL", NULL, "DRV" },
  67         { "OUTR", NULL, "DRV" },
  68 };
  69
  70 static const struct snd_soc_component_driver dio2125_component_driver = {
  71         .dapm_widgets           = dio2125_dapm_widgets,
  72         .num_dapm_widgets       = ARRAY_SIZE(dio2125_dapm_widgets),
  73         .dapm_routes            = dio2125_dapm_routes,
  74         .num_dapm_routes        = ARRAY_SIZE(dio2125_dapm_routes),
  75 };
  76
  77 static int dio2125_probe(struct platform_device *pdev)
  78 {
  79         struct device *dev = &pdev->dev;
  80         struct dio2125 *priv;
  81         int err;
  82
  83         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  84         if (priv == NULL)
  85                 return -ENOMEM;
  86         platform_set_drvdata(pdev, priv);
  87
  88         priv->gpiod_enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
  89         if (IS_ERR(priv->gpiod_enable)) {
  90                 err = PTR_ERR(priv->gpiod_enable);
  91                 if (err != -EPROBE_DEFER)
  92                         dev_err(dev, "Failed to get 'enable' gpio: %d", err);
  93                 return err;
  94         }
  95
  96         return devm_snd_soc_register_component(dev, &dio2125_component_driver,
  97                                                NULL, 0);
  98 }
  99
 100 #ifdef CONFIG_OF
 101 static const struct of_device_id dio2125_ids[] = {
 102         { .compatible = "dioo,dio2125", },
 103         { }
 104 };
 105 MODULE_DEVICE_TABLE(of, dio2125_ids);
 106 #endif
 107
 108 static struct platform_driver dio2125_driver = {
 109         .driver = {
 110                 .name = DRV_NAME,
 111                 .of_match_table = of_match_ptr(dio2125_ids),
 112         },
 113         .probe = dio2125_probe,
 114 };
 115
 116 module_platform_driver(dio2125_driver);
 117
 118 MODULE_DESCRIPTION("ASoC DIO2125 output driver");
 119 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 120 MODULE_LICENSE("GPL");