LXR linux/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
  26struct dio2125 {
  27        struct gpio_desc *gpiod_enable;
  28};
  29
  30static 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
  54static 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
  63static 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
  70static 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
  77static 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
 101static const struct of_device_id dio2125_ids[] = {
 102        { .compatible = "dioo,dio2125", },
 103        { }
 104};
 105MODULE_DEVICE_TABLE(of, dio2125_ids);
 106#endif
 107
 108static 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
 116module_platform_driver(dio2125_driver);
 117
 118MODULE_DESCRIPTION("ASoC DIO2125 output driver");
 119MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 120MODULE_LICENSE("GPL");
 121