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/consumer.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <sound/pcm.h> 20 #include <sound/soc.h> 21 #include <sound/soc-dai.h> 22 #include <sound/soc-dapm.h> 23 24 struct nau8315_priv { 25 struct gpio_desc *enable; 26 int enpin_switch; 27 }; 28 29 static int nau8315_daiops_trigger(struct snd_pcm_substream *substream, 30 int cmd, struct snd_soc_dai *dai) 31 { 32 struct snd_soc_component *component = dai->component; 33 struct nau8315_priv *nau8315 = 34 snd_soc_component_get_drvdata(component); 35 36 if (!nau8315->enable) 37 return 0; 38 39 switch (cmd) { 40 case SNDRV_PCM_TRIGGER_START: 41 case SNDRV_PCM_TRIGGER_RESUME: 42 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 43 if (nau8315->enpin_switch) { 44 gpiod_set_value(nau8315->enable, 1); 45 dev_dbg(component->dev, "set enable to 1"); 46 } 47 break; 48 case SNDRV_PCM_TRIGGER_STOP: 49 case SNDRV_PCM_TRIGGER_SUSPEND: 50 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 51 gpiod_set_value(nau8315->enable, 0); 52 dev_dbg(component->dev, "set enable to 0"); 53 break; 54 } 55 56 return 0; 57 } 58 59 static int nau8315_enpin_event(struct snd_soc_dapm_widget *w, 60 struct snd_kcontrol *kcontrol, int event) 61 { 62 struct snd_soc_component *component = 63 snd_soc_dapm_to_component(w->dapm); 64 struct nau8315_priv *nau8315 = 65 snd_soc_component_get_drvdata(component); 66 67 if (event & SND_SOC_DAPM_PRE_PMU) 68 nau8315->enpin_switch = 1; 69 else if (event & SND_SOC_DAPM_POST_PMD) 70 nau8315->enpin_switch = 0; 71 72 return 0; 73 } 74 75 static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = { 76 SND_SOC_DAPM_OUTPUT("Speaker"), 77 SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0, 78 nau8315_enpin_event, 79 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), 80 }; 81 82 static const struct snd_soc_dapm_route nau8315_dapm_routes[] = { 83 {"EN_Pin", NULL, "HiFi Playback"}, 84 {"Speaker", NULL, "EN_Pin"}, 85 }; 86 87 static const struct snd_soc_component_driver nau8315_component_driver = { 88 .dapm_widgets = nau8315_dapm_widgets, 89 .num_dapm_widgets = ARRAY_SIZE(nau8315_dapm_widgets), 90 .dapm_routes = nau8315_dapm_routes, 91 .num_dapm_routes = ARRAY_SIZE(nau8315_dapm_routes), 92 .idle_bias_on = 1, 93 .use_pmdown_time = 1, 94 .endianness = 1, 95 }; 96 97 static const struct snd_soc_dai_ops nau8315_dai_ops = { 98 .trigger = nau8315_daiops_trigger, 99 }; 100 101 #define NAU8315_RATES SNDRV_PCM_RATE_8000_96000 102 #define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE) 103 104 static struct snd_soc_dai_driver nau8315_dai_driver = { 105 .name = "nau8315-hifi", 106 .playback = { 107 .stream_name = "HiFi Playback", 108 .formats = NAU8315_FORMATS, 109 .rates = NAU8315_RATES, 110 .channels_min = 1, 111 .channels_max = 2, 112 }, 113 .ops = &nau8315_dai_ops, 114 }; 115 116 static int nau8315_platform_probe(struct platform_device *pdev) 117 { 118 struct nau8315_priv *nau8315; 119 120 nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL); 121 if (!nau8315) 122 return -ENOMEM; 123 124 nau8315->enable = devm_gpiod_get_optional(&pdev->dev, 125 "enable", GPIOD_OUT_LOW); 126 if (IS_ERR(nau8315->enable)) 127 return PTR_ERR(nau8315->enable); 128 129 dev_set_drvdata(&pdev->dev, nau8315); 130 131 return devm_snd_soc_register_component(&pdev->dev, 132 &nau8315_component_driver, 133 &nau8315_dai_driver, 1); 134 } 135 136 #ifdef CONFIG_OF 137 static const struct of_device_id nau8315_device_id[] = { 138 { .compatible = "nuvoton,nau8315" }, 139 { .compatible = "nuvoton,nau8318" }, 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 { "NVTN2012", 0}, 149 {}, 150 }; 151 MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match); 152 #endif 153 154 static struct platform_driver nau8315_platform_driver = { 155 .driver = { 156 .name = "nau8315", 157 .of_match_table = of_match_ptr(nau8315_device_id), 158 .acpi_match_table = ACPI_PTR(nau8315_acpi_match), 159 }, 160 .probe = nau8315_platform_probe, 161 }; 162 module_platform_driver(nau8315_platform_driver); 163 164 MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver"); 165 MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>"); 166 MODULE_LICENSE("GPL v2"); 167