1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // nau8315.c -- NAU8315 ALSA SoC Audio Amplifier Driver 4 // 5 // Copyright 2020 Nuvoton Technology Crop. 6 // 7 // Author: David Lin <ctlin0@nuvoton.com> 8 // 9 // Based on MAX98357A.c 10 11 #include <linux/acpi.h> 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/gpio.h> 15 #include <linux/gpio/consumer.h> 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <sound/pcm.h> 21 #include <sound/soc.h> 22 #include <sound/soc-dai.h> 23 #include <sound/soc-dapm.h> 24 25 struct nau8315_priv { 26 struct gpio_desc *enable; 27 int enpin_switch; 28 }; 29 30 static int nau8315_daiops_trigger(struct snd_pcm_substream *substream, 31 int cmd, struct snd_soc_dai *dai) 32 { 33 struct snd_soc_component *component = dai->component; 34 struct nau8315_priv *nau8315 = 35 snd_soc_component_get_drvdata(component); 36 37 if (!nau8315->enable) 38 return 0; 39 40 switch (cmd) { 41 case SNDRV_PCM_TRIGGER_START: 42 case SNDRV_PCM_TRIGGER_RESUME: 43 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 44 if (nau8315->enpin_switch) { 45 gpiod_set_value(nau8315->enable, 1); 46 dev_dbg(component->dev, "set enable to 1"); 47 } 48 break; 49 case SNDRV_PCM_TRIGGER_STOP: 50 case SNDRV_PCM_TRIGGER_SUSPEND: 51 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 52 gpiod_set_value(nau8315->enable, 0); 53 dev_dbg(component->dev, "set enable to 0"); 54 break; 55 } 56 57 return 0; 58 } 59 60 static int nau8315_enpin_event(struct snd_soc_dapm_widget *w, 61 struct snd_kcontrol *kcontrol, int event) 62 { 63 struct snd_soc_component *component = 64 snd_soc_dapm_to_component(w->dapm); 65 struct nau8315_priv *nau8315 = 66 snd_soc_component_get_drvdata(component); 67 68 if (event & SND_SOC_DAPM_PRE_PMU) 69 nau8315->enpin_switch = 1; 70 else if (event & SND_SOC_DAPM_POST_PMD) 71 nau8315->enpin_switch = 0; 72 73 return 0; 74 } 75 76 static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = { 77 SND_SOC_DAPM_OUTPUT("Speaker"), 78 SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0, 79 nau8315_enpin_event, 80 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), 81 }; 82 83 static const struct snd_soc_dapm_route nau8315_dapm_routes[] = { 84 {"EN_Pin", NULL, "HiFi Playback"}, 85 {"Speaker", NULL, "EN_Pin"}, 86 }; 87 88 static const struct snd_soc_component_driver nau8315_component_driver = { 89 .dapm_widgets = nau8315_dapm_widgets, 90 .num_dapm_widgets = ARRAY_SIZE(nau8315_dapm_widgets), 91 .dapm_routes = nau8315_dapm_routes, 92 .num_dapm_routes = ARRAY_SIZE(nau8315_dapm_routes), 93 .idle_bias_on = 1, 94 .use_pmdown_time = 1, 95 .endianness = 1, 96 }; 97 98 static const struct snd_soc_dai_ops nau8315_dai_ops = { 99 .trigger = nau8315_daiops_trigger, 100 }; 101 102 #define NAU8315_RATES SNDRV_PCM_RATE_8000_96000 103 #define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE) 104 105 static struct snd_soc_dai_driver nau8315_dai_driver = { 106 .name = "nau8315-hifi", 107 .playback = { 108 .stream_name = "HiFi Playback", 109 .formats = NAU8315_FORMATS, 110 .rates = NAU8315_RATES, 111 .channels_min = 1, 112 .channels_max = 2, 113 }, 114 .ops = &nau8315_dai_ops, 115 }; 116 117 static int nau8315_platform_probe(struct platform_device *pdev) 118 { 119 struct nau8315_priv *nau8315; 120 121 nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL); 122 if (!nau8315) 123 return -ENOMEM; 124 125 nau8315->enable = devm_gpiod_get_optional(&pdev->dev, 126 "enable", GPIOD_OUT_LOW); 127 if (IS_ERR(nau8315->enable)) 128 return PTR_ERR(nau8315->enable); 129 130 dev_set_drvdata(&pdev->dev, nau8315); 131 132 return devm_snd_soc_register_component(&pdev->dev, 133 &nau8315_component_driver, 134 &nau8315_dai_driver, 1); 135 } 136 137 #ifdef CONFIG_OF 138 static const struct of_device_id nau8315_device_id[] = { 139 { .compatible = "nuvoton,nau8315" }, 140 {} 141 }; 142 MODULE_DEVICE_TABLE(of, nau8315_device_id); 143 #endif 144 145 #ifdef CONFIG_ACPI 146 static const struct acpi_device_id nau8315_acpi_match[] = { 147 { "NVTN2010", 0 }, 148 {}, 149 }; 150 MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match); 151 #endif 152 153 static struct platform_driver nau8315_platform_driver = { 154 .driver = { 155 .name = "nau8315", 156 .of_match_table = of_match_ptr(nau8315_device_id), 157 .acpi_match_table = ACPI_PTR(nau8315_acpi_match), 158 }, 159 .probe = nau8315_platform_probe, 160 }; 161 module_platform_driver(nau8315_platform_driver); 162 163 MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver"); 164 MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>"); 165 MODULE_LICENSE("GPL v2"); 166