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/acpi.h>
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/gpio.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <sound/pcm.h>
  18 #include <sound/soc.h>
  19 #include <sound/soc-dai.h>
  20 #include <sound/soc-dapm.h>
  21
  22 struct rt1015p_priv {
  23         struct gpio_desc *sdb;
  24         bool calib_done;
  25 };
  26
  27 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
  28                 struct snd_kcontrol *kcontrol, int event)
  29 {
  30         struct snd_soc_component *component =
  31                 snd_soc_dapm_to_component(w->dapm);
  32         struct rt1015p_priv *rt1015p =
  33                 snd_soc_component_get_drvdata(component);
  34
  35         if (!rt1015p->sdb)
  36                 return 0;
  37
  38         switch (event) {
  39         case SND_SOC_DAPM_PRE_PMU:
  40                 gpiod_set_value_cansleep(rt1015p->sdb, 1);
  41                 dev_dbg(component->dev, "set sdb to 1");
  42
  43                 if (!rt1015p->calib_done) {
  44                         msleep(300);
  45                         rt1015p->calib_done = true;
  46                 }
  47                 break;
  48         case SND_SOC_DAPM_POST_PMD:
  49                 gpiod_set_value_cansleep(rt1015p->sdb, 0);
  50                 dev_dbg(component->dev, "set sdb to 0");
  51                 break;
  52         default:
  53                 break;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
  60         SND_SOC_DAPM_OUTPUT("Speaker"),
  61         SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
  62                         rt1015p_sdb_event,
  63                         SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  64 };
  65
  66 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
  67         {"SDB", NULL, "HiFi Playback"},
  68         {"Speaker", NULL, "SDB"},
  69 };
  70
  71 #ifdef CONFIG_PM
  72 static int rt1015p_suspend(struct snd_soc_component *component)
  73 {
  74         struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
  75
  76         rt1015p->calib_done = false;
  77         return 0;
  78 }
  79 #else
  80 #define rt1015p_suspend NULL
  81 #endif
  82
  83 static const struct snd_soc_component_driver rt1015p_component_driver = {
  84         .suspend                = rt1015p_suspend,
  85         .dapm_widgets           = rt1015p_dapm_widgets,
  86         .num_dapm_widgets       = ARRAY_SIZE(rt1015p_dapm_widgets),
  87         .dapm_routes            = rt1015p_dapm_routes,
  88         .num_dapm_routes        = ARRAY_SIZE(rt1015p_dapm_routes),
  89         .idle_bias_on           = 1,
  90         .use_pmdown_time        = 1,
  91         .endianness             = 1,
  92         .non_legacy_dai_naming  = 1,
  93 };
  94
  95 static struct snd_soc_dai_driver rt1015p_dai_driver = {
  96         .name = "HiFi",
  97         .playback = {
  98                 .stream_name    = "HiFi Playback",
  99                 .formats        = SNDRV_PCM_FMTBIT_S24 |
 100                                         SNDRV_PCM_FMTBIT_S32,
 101                 .rates          = SNDRV_PCM_RATE_48000,
 102                 .channels_min   = 1,
 103                 .channels_max   = 2,
 104         },
 105 };
 106
 107 static int rt1015p_platform_probe(struct platform_device *pdev)
 108 {
 109         struct rt1015p_priv *rt1015p;
 110
 111         rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
 112         if (!rt1015p)
 113                 return -ENOMEM;
 114
 115         rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
 116                                 "sdb", GPIOD_OUT_LOW);
 117         if (IS_ERR(rt1015p->sdb))
 118                 return PTR_ERR(rt1015p->sdb);
 119
 120         dev_set_drvdata(&pdev->dev, rt1015p);
 121
 122         return devm_snd_soc_register_component(&pdev->dev,
 123                         &rt1015p_component_driver,
 124                         &rt1015p_dai_driver, 1);
 125 }
 126
 127 #ifdef CONFIG_OF
 128 static const struct of_device_id rt1015p_device_id[] = {
 129         { .compatible = "realtek,rt1015p" },
 130         {}
 131 };
 132 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
 133 #endif
 134
 135 #ifdef CONFIG_ACPI
 136 static const struct acpi_device_id rt1015p_acpi_match[] = {
 137         { "RTL1015", 0},
 138         { },
 139 };
 140 MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
 141 #endif
 142
 143 static struct platform_driver rt1015p_platform_driver = {
 144         .driver = {
 145                 .name = "rt1015p",
 146                 .of_match_table = of_match_ptr(rt1015p_device_id),
 147                 .acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
 148         },
 149         .probe = rt1015p_platform_probe,
 150 };
 151 module_platform_driver(rt1015p_platform_driver);
 152
 153 MODULE_DESCRIPTION("ASoC RT1015P driver");
 154 MODULE_LICENSE("GPL v2");