LXR linux/sound/soc/codecs/max98357a.c

   1/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
   2 *
   3 * This program is free software; you can redistribute it and/or modify
   4 * it under the terms of the GNU General Public License version 2 and
   5 * only version 2 as published by the Free Software Foundation.
   6 *
   7 * This program is distributed in the hope that it will be useful,
   8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 * GNU General Public License for more details.
  11 *
  12 * max98357a.c -- MAX98357A ALSA SoC Codec driver
  13 */
  14
  15#include <linux/acpi.h>
  16#include <linux/device.h>
  17#include <linux/err.h>
  18#include <linux/gpio.h>
  19#include <linux/gpio/consumer.h>
  20#include <linux/kernel.h>
  21#include <linux/mod_devicetable.h>
  22#include <linux/module.h>
  23#include <linux/of.h>
  24#include <linux/platform_device.h>
  25#include <sound/pcm.h>
  26#include <sound/soc.h>
  27#include <sound/soc-dai.h>
  28#include <sound/soc-dapm.h>
  29
  30static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  31                int cmd, struct snd_soc_dai *dai)
  32{
  33        struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  34
  35        if (!sdmode)
  36                return 0;
  37
  38        switch (cmd) {
  39        case SNDRV_PCM_TRIGGER_START:
  40        case SNDRV_PCM_TRIGGER_RESUME:
  41        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  42                gpiod_set_value(sdmode, 1);
  43                break;
  44        case SNDRV_PCM_TRIGGER_STOP:
  45        case SNDRV_PCM_TRIGGER_SUSPEND:
  46        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  47                gpiod_set_value(sdmode, 0);
  48                break;
  49        }
  50
  51        return 0;
  52}
  53
  54static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  55        SND_SOC_DAPM_OUTPUT("Speaker"),
  56};
  57
  58static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  59        {"Speaker", NULL, "HiFi Playback"},
  60};
  61
  62static int max98357a_codec_probe(struct snd_soc_codec *codec)
  63{
  64        struct gpio_desc *sdmode;
  65
  66        sdmode = devm_gpiod_get_optional(codec->dev, "sdmode", GPIOD_OUT_LOW);
  67        if (IS_ERR(sdmode))
  68                return PTR_ERR(sdmode);
  69
  70        snd_soc_codec_set_drvdata(codec, sdmode);
  71
  72        return 0;
  73}
  74
  75static struct snd_soc_codec_driver max98357a_codec_driver = {
  76        .probe                  = max98357a_codec_probe,
  77        .dapm_widgets           = max98357a_dapm_widgets,
  78        .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  79        .dapm_routes            = max98357a_dapm_routes,
  80        .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  81};
  82
  83static const struct snd_soc_dai_ops max98357a_dai_ops = {
  84        .trigger        = max98357a_daiops_trigger,
  85};
  86
  87static struct snd_soc_dai_driver max98357a_dai_driver = {
  88        .name = "HiFi",
  89        .playback = {
  90                .stream_name    = "HiFi Playback",
  91                .formats        = SNDRV_PCM_FMTBIT_S16 |
  92                                        SNDRV_PCM_FMTBIT_S24 |
  93                                        SNDRV_PCM_FMTBIT_S32,
  94                .rates          = SNDRV_PCM_RATE_8000 |
  95                                        SNDRV_PCM_RATE_16000 |
  96                                        SNDRV_PCM_RATE_48000 |
  97                                        SNDRV_PCM_RATE_96000,
  98                .rate_min       = 8000,
  99                .rate_max       = 96000,
 100                .channels_min   = 1,
 101                .channels_max   = 2,
 102        },
 103        .ops    = &max98357a_dai_ops,
 104};
 105
 106static int max98357a_platform_probe(struct platform_device *pdev)
 107{
 108        return snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 109                        &max98357a_dai_driver, 1);
 110}
 111
 112static int max98357a_platform_remove(struct platform_device *pdev)
 113{
 114        snd_soc_unregister_codec(&pdev->dev);
 115
 116        return 0;
 117}
 118
 119#ifdef CONFIG_OF
 120static const struct of_device_id max98357a_device_id[] = {
 121        { .compatible = "maxim,max98357a" },
 122        {}
 123};
 124MODULE_DEVICE_TABLE(of, max98357a_device_id);
 125#endif
 126
 127#ifdef CONFIG_ACPI
 128static const struct acpi_device_id max98357a_acpi_match[] = {
 129        { "MX98357A", 0 },
 130        {},
 131};
 132MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 133#endif
 134
 135static struct platform_driver max98357a_platform_driver = {
 136        .driver = {
 137                .name = "max98357a",
 138                .of_match_table = of_match_ptr(max98357a_device_id),
 139                .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 140        },
 141        .probe  = max98357a_platform_probe,
 142        .remove = max98357a_platform_remove,
 143};
 144module_platform_driver(max98357a_platform_driver);
 145
 146MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 147MODULE_LICENSE("GPL v2");
 148