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/consumer.h> 12 #include <linux/kernel.h> 13 #include <linux/mod_devicetable.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 max98357a_priv { 23 struct gpio_desc *sdmode; 24 unsigned int sdmode_delay; 25 int sdmode_switch; 26 }; 27 28 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 29 int cmd, struct snd_soc_dai *dai) 30 { 31 struct snd_soc_component *component = dai->component; 32 struct max98357a_priv *max98357a = 33 snd_soc_component_get_drvdata(component); 34 35 if (!max98357a->sdmode) 36 return 0; 37 38 switch (cmd) { 39 case SNDRV_PCM_TRIGGER_START: 40 case SNDRV_PCM_TRIGGER_RESUME: 41 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 42 mdelay(max98357a->sdmode_delay); 43 if (max98357a->sdmode_switch) { 44 gpiod_set_value(max98357a->sdmode, 1); 45 dev_dbg(component->dev, "set sdmode 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(max98357a->sdmode, 0); 52 dev_dbg(component->dev, "set sdmode to 0"); 53 break; 54 } 55 56 return 0; 57 } 58 59 static int max98357a_sdmode_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 max98357a_priv *max98357a = 65 snd_soc_component_get_drvdata(component); 66 67 if (event & SND_SOC_DAPM_POST_PMU) 68 max98357a->sdmode_switch = 1; 69 else if (event & SND_SOC_DAPM_POST_PMD) 70 max98357a->sdmode_switch = 0; 71 72 return 0; 73 } 74 75 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 76 SND_SOC_DAPM_OUTPUT("Speaker"), 77 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0, 78 max98357a_sdmode_event, 79 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 80 }; 81 82 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 83 {"SD_MODE", NULL, "HiFi Playback"}, 84 {"Speaker", NULL, "SD_MODE"}, 85 }; 86 87 static const struct snd_soc_component_driver max98357a_component_driver = { 88 .dapm_widgets = max98357a_dapm_widgets, 89 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 90 .dapm_routes = max98357a_dapm_routes, 91 .num_dapm_routes = ARRAY_SIZE(max98357a_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 max98357a_dai_ops = { 98 .trigger = max98357a_daiops_trigger, 99 }; 100 101 static struct snd_soc_dai_driver max98357a_dai_driver = { 102 .name = "HiFi", 103 .playback = { 104 .stream_name = "HiFi Playback", 105 .formats = SNDRV_PCM_FMTBIT_S16 | 106 SNDRV_PCM_FMTBIT_S24 | 107 SNDRV_PCM_FMTBIT_S32, 108 .rates = SNDRV_PCM_RATE_8000 | 109 SNDRV_PCM_RATE_16000 | 110 SNDRV_PCM_RATE_32000 | 111 SNDRV_PCM_RATE_44100 | 112 SNDRV_PCM_RATE_48000 | 113 SNDRV_PCM_RATE_88200 | 114 SNDRV_PCM_RATE_96000, 115 .rate_min = 8000, 116 .rate_max = 96000, 117 .channels_min = 1, 118 .channels_max = 2, 119 }, 120 .ops = &max98357a_dai_ops, 121 }; 122 123 static int max98357a_platform_probe(struct platform_device *pdev) 124 { 125 struct max98357a_priv *max98357a; 126 int ret; 127 128 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); 129 if (!max98357a) 130 return -ENOMEM; 131 132 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, 133 "sdmode", GPIOD_OUT_LOW); 134 if (IS_ERR(max98357a->sdmode)) 135 return PTR_ERR(max98357a->sdmode); 136 137 ret = device_property_read_u32(&pdev->dev, "sdmode-delay", 138 &max98357a->sdmode_delay); 139 if (ret) { 140 max98357a->sdmode_delay = 0; 141 dev_dbg(&pdev->dev, 142 "no optional property 'sdmode-delay' found, " 143 "default: no delay\n"); 144 } 145 146 dev_set_drvdata(&pdev->dev, max98357a); 147 148 return devm_snd_soc_register_component(&pdev->dev, 149 &max98357a_component_driver, 150 &max98357a_dai_driver, 1); 151 } 152 153 #ifdef CONFIG_OF 154 static const struct of_device_id max98357a_device_id[] = { 155 { .compatible = "maxim,max98357a" }, 156 { .compatible = "maxim,max98360a" }, 157 {} 158 }; 159 MODULE_DEVICE_TABLE(of, max98357a_device_id); 160 #endif 161 162 #ifdef CONFIG_ACPI 163 static const struct acpi_device_id max98357a_acpi_match[] = { 164 { "MX98357A", 0 }, 165 { "MX98360A", 0 }, 166 {}, 167 }; 168 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 169 #endif 170 171 static struct platform_driver max98357a_platform_driver = { 172 .driver = { 173 .name = "max98357a", 174 .of_match_table = of_match_ptr(max98357a_device_id), 175 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 176 }, 177 .probe = max98357a_platform_probe, 178 }; 179 module_platform_driver(max98357a_platform_driver); 180 181 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 182 MODULE_LICENSE("GPL v2"); 183