sound/soc/codecs/rt1015p.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // rt1015p.c  --  RT1015P ALSA SoC audio amplifier driver
   4 //
   5 // Copyright 2020 The Linux Foundation. All rights reserved.
   6
   7 #include <linux/delay.h>
   8 #include <linux/device.h>
   9 #include <linux/err.h>
  10 #include <linux/gpio.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <sound/pcm.h>
  17 #include <sound/soc.h>
  18 #include <sound/soc-dai.h>
  19 #include <sound/soc-dapm.h>
  20
  21 struct rt1015p_priv {
  22         struct gpio_desc *sdb;
  23         bool calib_done;
  24 };
  25
  26 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
  27                 struct snd_kcontrol *kcontrol, int event)
  28 {
  29         struct snd_soc_component *component =
  30                 snd_soc_dapm_to_component(w->dapm);
  31         struct rt1015p_priv *rt1015p =
  32                 snd_soc_component_get_drvdata(component);
  33
  34         if (!rt1015p->sdb)
  35                 return 0;
  36
  37         switch (event) {
  38         case SND_SOC_DAPM_PRE_PMU:
  39                 gpiod_set_value_cansleep(rt1015p->sdb, 1);
  40                 dev_dbg(component->dev, "set sdb to 1");
  41
  42                 if (!rt1015p->calib_done) {
  43                         msleep(300);
  44                         rt1015p->calib_done = true;
  45                 }
  46                 break;
  47         case SND_SOC_DAPM_POST_PMD:
  48                 gpiod_set_value_cansleep(rt1015p->sdb, 0);
  49                 dev_dbg(component->dev, "set sdb to 0");
  50                 break;
  51         default:
  52                 break;
  53         }
  54
  55         return 0;
  56 }
  57
  58 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
  59         SND_SOC_DAPM_OUTPUT("Speaker"),
  60         SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
  61                         rt1015p_sdb_event,
  62                         SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  63 };
  64
  65 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
  66         {"SDB", NULL, "HiFi Playback"},
  67         {"Speaker", NULL, "SDB"},
  68 };
  69
  70 #ifdef CONFIG_PM
  71 static int rt1015p_suspend(struct snd_soc_component *component)
  72 {
  73         struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
  74
  75         rt1015p->calib_done = false;
  76         return 0;
  77 }
  78 #else
  79 #define rt1015p_suspend NULL
  80 #endif
  81
  82 static const struct snd_soc_component_driver rt1015p_component_driver = {
  83         .suspend                = rt1015p_suspend,
  84         .dapm_widgets           = rt1015p_dapm_widgets,
  85         .num_dapm_widgets       = ARRAY_SIZE(rt1015p_dapm_widgets),
  86         .dapm_routes            = rt1015p_dapm_routes,
  87         .num_dapm_routes        = ARRAY_SIZE(rt1015p_dapm_routes),
  88         .idle_bias_on           = 1,
  89         .use_pmdown_time        = 1,
  90         .endianness             = 1,
  91         .non_legacy_dai_naming  = 1,
  92 };
  93
  94 static struct snd_soc_dai_driver rt1015p_dai_driver = {
  95         .name = "HiFi",
  96         .playback = {
  97                 .stream_name    = "HiFi Playback",
  98                 .formats        = SNDRV_PCM_FMTBIT_S24,
  99                 .rates          = SNDRV_PCM_RATE_48000,
 100                 .channels_min   = 1,
 101                 .channels_max   = 2,
 102         },
 103 };
 104
 105 static int rt1015p_platform_probe(struct platform_device *pdev)
 106 {
 107         struct rt1015p_priv *rt1015p;
 108
 109         rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
 110         if (!rt1015p)
 111                 return -ENOMEM;
 112
 113         rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
 114                                 "sdb", GPIOD_OUT_LOW);
 115         if (IS_ERR(rt1015p->sdb))
 116                 return PTR_ERR(rt1015p->sdb);
 117
 118         dev_set_drvdata(&pdev->dev, rt1015p);
 119
 120         return devm_snd_soc_register_component(&pdev->dev,
 121                         &rt1015p_component_driver,
 122                         &rt1015p_dai_driver, 1);
 123 }
 124
 125 #ifdef CONFIG_OF
 126 static const struct of_device_id rt1015p_device_id[] = {
 127         { .compatible = "realtek,rt1015p" },
 128         {}
 129 };
 130 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
 131 #endif
 132
 133 static struct platform_driver rt1015p_platform_driver = {
 134         .driver = {
 135                 .name = "rt1015p",
 136                 .of_match_table = of_match_ptr(rt1015p_device_id),
 137         },
 138         .probe = rt1015p_platform_probe,
 139 };
 140 module_platform_driver(rt1015p_platform_driver);
 141
 142 MODULE_DESCRIPTION("ASoC RT1015P driver");
 143 MODULE_LICENSE("GPL v2");