1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. 3 * 4 * max98357a.c -- MAX98357A ALSA SoC Codec driver 5 */ 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/mod_devicetable.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <sound/pcm.h> 19 #include <sound/soc.h> 20 #include <sound/soc-dai.h> 21 #include <sound/soc-dapm.h> 22 23 struct max98357a_priv { 24 struct gpio_desc *sdmode; 25 unsigned int sdmode_delay; 26 }; 27 28 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w, 29 struct snd_kcontrol *kcontrol, int event) 30 { 31 struct snd_soc_component *component = 32 snd_soc_dapm_to_component(w->dapm); 33 struct max98357a_priv *max98357a = 34 snd_soc_component_get_drvdata(component); 35 36 if (!max98357a->sdmode) 37 return 0; 38 39 if (event & SND_SOC_DAPM_POST_PMU) { 40 msleep(max98357a->sdmode_delay); 41 gpiod_set_value(max98357a->sdmode, 1); 42 dev_dbg(component->dev, "set sdmode to 1"); 43 } else if (event & SND_SOC_DAPM_PRE_PMD) { 44 gpiod_set_value(max98357a->sdmode, 0); 45 dev_dbg(component->dev, "set sdmode to 0"); 46 } 47 48 return 0; 49 } 50 51 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 52 SND_SOC_DAPM_OUTPUT("Speaker"), 53 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0, 54 max98357a_sdmode_event, 55 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), 56 }; 57 58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 59 {"SD_MODE", NULL, "HiFi Playback"}, 60 {"Speaker", NULL, "SD_MODE"}, 61 }; 62 63 static const struct snd_soc_component_driver max98357a_component_driver = { 64 .dapm_widgets = max98357a_dapm_widgets, 65 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 66 .dapm_routes = max98357a_dapm_routes, 67 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 68 .idle_bias_on = 1, 69 .use_pmdown_time = 1, 70 .endianness = 1, 71 .non_legacy_dai_naming = 1, 72 }; 73 74 static struct snd_soc_dai_driver max98357a_dai_driver = { 75 .name = "HiFi", 76 .playback = { 77 .stream_name = "HiFi Playback", 78 .formats = SNDRV_PCM_FMTBIT_S16 | 79 SNDRV_PCM_FMTBIT_S24 | 80 SNDRV_PCM_FMTBIT_S32, 81 .rates = SNDRV_PCM_RATE_8000 | 82 SNDRV_PCM_RATE_16000 | 83 SNDRV_PCM_RATE_32000 | 84 SNDRV_PCM_RATE_44100 | 85 SNDRV_PCM_RATE_48000 | 86 SNDRV_PCM_RATE_88200 | 87 SNDRV_PCM_RATE_96000, 88 .rate_min = 8000, 89 .rate_max = 96000, 90 .channels_min = 1, 91 .channels_max = 2, 92 }, 93 }; 94 95 static int max98357a_platform_probe(struct platform_device *pdev) 96 { 97 struct max98357a_priv *max98357a; 98 int ret; 99 100 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); 101 if (!max98357a) 102 return -ENOMEM; 103 104 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, 105 "sdmode", GPIOD_OUT_LOW); 106 if (IS_ERR(max98357a->sdmode)) 107 return PTR_ERR(max98357a->sdmode); 108 109 ret = device_property_read_u32(&pdev->dev, "sdmode-delay", 110 &max98357a->sdmode_delay); 111 if (ret) { 112 max98357a->sdmode_delay = 0; 113 dev_dbg(&pdev->dev, 114 "no optional property 'sdmode-delay' found, " 115 "default: no delay\n"); 116 } 117 118 dev_set_drvdata(&pdev->dev, max98357a); 119 120 return devm_snd_soc_register_component(&pdev->dev, 121 &max98357a_component_driver, 122 &max98357a_dai_driver, 1); 123 } 124 125 #ifdef CONFIG_OF 126 static const struct of_device_id max98357a_device_id[] = { 127 { .compatible = "maxim,max98357a" }, 128 {} 129 }; 130 MODULE_DEVICE_TABLE(of, max98357a_device_id); 131 #endif 132 133 #ifdef CONFIG_ACPI 134 static const struct acpi_device_id max98357a_acpi_match[] = { 135 { "MX98357A", 0 }, 136 { "MX98360A", 0 }, 137 {}, 138 }; 139 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 140 #endif 141 142 static struct platform_driver max98357a_platform_driver = { 143 .driver = { 144 .name = "max98357a", 145 .of_match_table = of_match_ptr(max98357a_device_id), 146 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 147 }, 148 .probe = max98357a_platform_probe, 149 }; 150 module_platform_driver(max98357a_platform_driver); 151 152 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 153 MODULE_LICENSE("GPL v2"); 154