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 int sdmode_switch; 27 }; 28 29 static int max98357a_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 max98357a_priv *max98357a = 34 snd_soc_component_get_drvdata(component); 35 36 if (!max98357a->sdmode) 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 mdelay(max98357a->sdmode_delay); 44 if (max98357a->sdmode_switch) { 45 gpiod_set_value(max98357a->sdmode, 1); 46 dev_dbg(component->dev, "set sdmode 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(max98357a->sdmode, 0); 53 dev_dbg(component->dev, "set sdmode to 0"); 54 break; 55 } 56 57 return 0; 58 } 59 60 static int max98357a_sdmode_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 max98357a_priv *max98357a = 66 snd_soc_component_get_drvdata(component); 67 68 if (event & SND_SOC_DAPM_POST_PMU) 69 max98357a->sdmode_switch = 1; 70 else if (event & SND_SOC_DAPM_POST_PMD) 71 max98357a->sdmode_switch = 0; 72 73 return 0; 74 } 75 76 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 77 SND_SOC_DAPM_OUTPUT("Speaker"), 78 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0, 79 max98357a_sdmode_event, 80 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 81 }; 82 83 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 84 {"SD_MODE", NULL, "HiFi Playback"}, 85 {"Speaker", NULL, "SD_MODE"}, 86 }; 87 88 static const struct snd_soc_component_driver max98357a_component_driver = { 89 .dapm_widgets = max98357a_dapm_widgets, 90 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 91 .dapm_routes = max98357a_dapm_routes, 92 .num_dapm_routes = ARRAY_SIZE(max98357a_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 max98357a_dai_ops = { 99 .trigger = max98357a_daiops_trigger, 100 }; 101 102 static struct snd_soc_dai_driver max98357a_dai_driver = { 103 .name = "HiFi", 104 .playback = { 105 .stream_name = "HiFi Playback", 106 .formats = SNDRV_PCM_FMTBIT_S16 | 107 SNDRV_PCM_FMTBIT_S24 | 108 SNDRV_PCM_FMTBIT_S32, 109 .rates = SNDRV_PCM_RATE_8000 | 110 SNDRV_PCM_RATE_16000 | 111 SNDRV_PCM_RATE_32000 | 112 SNDRV_PCM_RATE_44100 | 113 SNDRV_PCM_RATE_48000 | 114 SNDRV_PCM_RATE_88200 | 115 SNDRV_PCM_RATE_96000, 116 .rate_min = 8000, 117 .rate_max = 96000, 118 .channels_min = 1, 119 .channels_max = 2, 120 }, 121 .ops = &max98357a_dai_ops, 122 }; 123 124 static int max98357a_platform_probe(struct platform_device *pdev) 125 { 126 struct max98357a_priv *max98357a; 127 int ret; 128 129 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); 130 if (!max98357a) 131 return -ENOMEM; 132 133 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, 134 "sdmode", GPIOD_OUT_LOW); 135 if (IS_ERR(max98357a->sdmode)) 136 return PTR_ERR(max98357a->sdmode); 137 138 ret = device_property_read_u32(&pdev->dev, "sdmode-delay", 139 &max98357a->sdmode_delay); 140 if (ret) { 141 max98357a->sdmode_delay = 0; 142 dev_dbg(&pdev->dev, 143 "no optional property 'sdmode-delay' found, " 144 "default: no delay\n"); 145 } 146 147 dev_set_drvdata(&pdev->dev, max98357a); 148 149 return devm_snd_soc_register_component(&pdev->dev, 150 &max98357a_component_driver, 151 &max98357a_dai_driver, 1); 152 } 153 154 #ifdef CONFIG_OF 155 static const struct of_device_id max98357a_device_id[] = { 156 { .compatible = "maxim,max98357a" }, 157 { .compatible = "maxim,max98360a" }, 158 {} 159 }; 160 MODULE_DEVICE_TABLE(of, max98357a_device_id); 161 #endif 162 163 #ifdef CONFIG_ACPI 164 static const struct acpi_device_id max98357a_acpi_match[] = { 165 { "MX98357A", 0 }, 166 { "MX98360A", 0 }, 167 {}, 168 }; 169 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 170 #endif 171 172 static struct platform_driver max98357a_platform_driver = { 173 .driver = { 174 .name = "max98357a", 175 .of_match_table = of_match_ptr(max98357a_device_id), 176 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 177 }, 178 .probe = max98357a_platform_probe, 179 }; 180 module_platform_driver(max98357a_platform_driver); 181 182 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 183 MODULE_LICENSE("GPL v2"); 184