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/device.h>
   8 #include <linux/err.h>
   9 #include <linux/gpio.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/platform_device.h>
  15 #include <sound/pcm.h>
  16 #include <sound/soc.h>
  17 #include <sound/soc-dai.h>
  18 #include <sound/soc-dapm.h>
  19
  20 struct rt1015p_priv {
  21         struct gpio_desc *sdb;
  22         int sdb_switch;
  23 };
  24
  25 static int rt1015p_daiops_trigger(struct snd_pcm_substream *substream,
  26                 int cmd, struct snd_soc_dai *dai)
  27 {
  28         struct snd_soc_component *component = dai->component;
  29         struct rt1015p_priv *rt1015p =
  30                 snd_soc_component_get_drvdata(component);
  31
  32         if (!rt1015p->sdb)
  33                 return 0;
  34
  35         switch (cmd) {
  36         case SNDRV_PCM_TRIGGER_START:
  37         case SNDRV_PCM_TRIGGER_RESUME:
  38         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  39                 if (rt1015p->sdb_switch) {
  40                         gpiod_set_value(rt1015p->sdb, 1);
  41                         dev_dbg(component->dev, "set sdb to 1");
  42                 }
  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(rt1015p->sdb, 0);
  48                 dev_dbg(component->dev, "set sdb to 0");
  49                 break;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
  56                 struct snd_kcontrol *kcontrol, int event)
  57 {
  58         struct snd_soc_component *component =
  59                 snd_soc_dapm_to_component(w->dapm);
  60         struct rt1015p_priv *rt1015p =
  61                 snd_soc_component_get_drvdata(component);
  62
  63         if (event & SND_SOC_DAPM_POST_PMU)
  64                 rt1015p->sdb_switch = 1;
  65         else if (event & SND_SOC_DAPM_POST_PMD)
  66                 rt1015p->sdb_switch = 0;
  67
  68         return 0;
  69 }
  70
  71 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
  72         SND_SOC_DAPM_OUTPUT("Speaker"),
  73         SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
  74                         rt1015p_sdb_event,
  75                         SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
  76 };
  77
  78 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
  79         {"SDB", NULL, "HiFi Playback"},
  80         {"Speaker", NULL, "SDB"},
  81 };
  82
  83 static const struct snd_soc_component_driver rt1015p_component_driver = {
  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 const struct snd_soc_dai_ops rt1015p_dai_ops = {
  95         .trigger        = rt1015p_daiops_trigger,
  96 };
  97
  98 static struct snd_soc_dai_driver rt1015p_dai_driver = {
  99         .name = "HiFi",
 100         .playback = {
 101                 .stream_name    = "HiFi Playback",
 102                 .formats        = SNDRV_PCM_FMTBIT_S24,
 103                 .rates          = SNDRV_PCM_RATE_48000,
 104                 .channels_min   = 1,
 105                 .channels_max   = 2,
 106         },
 107         .ops    = &rt1015p_dai_ops,
 108 };
 109
 110 static int rt1015p_platform_probe(struct platform_device *pdev)
 111 {
 112         struct rt1015p_priv *rt1015p;
 113
 114         rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
 115         if (!rt1015p)
 116                 return -ENOMEM;
 117
 118         rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
 119                                 "sdb", GPIOD_OUT_LOW);
 120         if (IS_ERR(rt1015p->sdb))
 121                 return PTR_ERR(rt1015p->sdb);
 122
 123         dev_set_drvdata(&pdev->dev, rt1015p);
 124
 125         return devm_snd_soc_register_component(&pdev->dev,
 126                         &rt1015p_component_driver,
 127                         &rt1015p_dai_driver, 1);
 128 }
 129
 130 #ifdef CONFIG_OF
 131 static const struct of_device_id rt1015p_device_id[] = {
 132         { .compatible = "realtek,rt1015p" },
 133         {}
 134 };
 135 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
 136 #endif
 137
 138 static struct platform_driver rt1015p_platform_driver = {
 139         .driver = {
 140                 .name = "rt1015p",
 141                 .of_match_table = of_match_ptr(rt1015p_device_id),
 142         },
 143         .probe = rt1015p_platform_probe,
 144 };
 145 module_platform_driver(rt1015p_platform_driver);
 146
 147 MODULE_DESCRIPTION("ASoC RT1015P driver");
 148 MODULE_LICENSE("GPL v2");