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/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <sound/pcm.h> 17 #include <sound/soc.h> 18 #include <sound/soc-dai.h> 19 #include <sound/soc-dapm.h> 20 21 struct max98357a_priv { 22 struct gpio_desc *sdmode; 23 unsigned int sdmode_delay; 24 int sdmode_switch; 25 }; 26 27 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 28 int cmd, struct snd_soc_dai *dai) 29 { 30 struct snd_soc_component *component = dai->component; 31 struct max98357a_priv *max98357a = 32 snd_soc_component_get_drvdata(component); 33 34 if (!max98357a->sdmode) 35 return 0; 36 37 switch (cmd) { 38 case SNDRV_PCM_TRIGGER_START: 39 case SNDRV_PCM_TRIGGER_RESUME: 40 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 41 mdelay(max98357a->sdmode_delay); 42 if (max98357a->sdmode_switch) { 43 gpiod_set_value(max98357a->sdmode, 1); 44 dev_dbg(component->dev, "set sdmode to 1"); 45 } 46 break; 47 case SNDRV_PCM_TRIGGER_STOP: 48 case SNDRV_PCM_TRIGGER_SUSPEND: 49 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 50 gpiod_set_value(max98357a->sdmode, 0); 51 dev_dbg(component->dev, "set sdmode to 0"); 52 break; 53 } 54 55 return 0; 56 } 57 58 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w, 59 struct snd_kcontrol *kcontrol, int event) 60 { 61 struct snd_soc_component *component = 62 snd_soc_dapm_to_component(w->dapm); 63 struct max98357a_priv *max98357a = 64 snd_soc_component_get_drvdata(component); 65 66 if (event & SND_SOC_DAPM_POST_PMU) 67 max98357a->sdmode_switch = 1; 68 else if (event & SND_SOC_DAPM_POST_PMD) 69 max98357a->sdmode_switch = 0; 70 71 return 0; 72 } 73 74 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 75 SND_SOC_DAPM_OUTPUT("Speaker"), 76 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0, 77 max98357a_sdmode_event, 78 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 79 }; 80 81 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 82 {"SD_MODE", NULL, "HiFi Playback"}, 83 {"Speaker", NULL, "SD_MODE"}, 84 }; 85 86 static const struct snd_soc_component_driver max98357a_component_driver = { 87 .dapm_widgets = max98357a_dapm_widgets, 88 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 89 .dapm_routes = max98357a_dapm_routes, 90 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 91 .idle_bias_on = 1, 92 .use_pmdown_time = 1, 93 .endianness = 1, 94 }; 95 96 static const struct snd_soc_dai_ops max98357a_dai_ops = { 97 .trigger = max98357a_daiops_trigger, 98 }; 99 100 static struct snd_soc_dai_driver max98357a_dai_driver = { 101 .name = "HiFi", 102 .playback = { 103 .stream_name = "HiFi Playback", 104 .formats = SNDRV_PCM_FMTBIT_S16 | 105 SNDRV_PCM_FMTBIT_S24 | 106 SNDRV_PCM_FMTBIT_S32, 107 .rates = SNDRV_PCM_RATE_8000 | 108 SNDRV_PCM_RATE_16000 | 109 SNDRV_PCM_RATE_32000 | 110 SNDRV_PCM_RATE_44100 | 111 SNDRV_PCM_RATE_48000 | 112 SNDRV_PCM_RATE_88200 | 113 SNDRV_PCM_RATE_96000, 114 .rate_min = 8000, 115 .rate_max = 96000, 116 .channels_min = 1, 117 .channels_max = 2, 118 }, 119 .ops = &max98357a_dai_ops, 120 }; 121 122 static int max98357a_platform_probe(struct platform_device *pdev) 123 { 124 struct max98357a_priv *max98357a; 125 int ret; 126 127 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); 128 if (!max98357a) 129 return -ENOMEM; 130 131 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, 132 "sdmode", GPIOD_OUT_LOW); 133 if (IS_ERR(max98357a->sdmode)) 134 return PTR_ERR(max98357a->sdmode); 135 136 ret = device_property_read_u32(&pdev->dev, "sdmode-delay", 137 &max98357a->sdmode_delay); 138 if (ret) { 139 max98357a->sdmode_delay = 0; 140 dev_dbg(&pdev->dev, 141 "no optional property 'sdmode-delay' found, " 142 "default: no delay\n"); 143 } 144 145 dev_set_drvdata(&pdev->dev, max98357a); 146 147 return devm_snd_soc_register_component(&pdev->dev, 148 &max98357a_component_driver, 149 &max98357a_dai_driver, 1); 150 } 151 152 #ifdef CONFIG_OF 153 static const struct of_device_id max98357a_device_id[] = { 154 { .compatible = "maxim,max98357a" }, 155 { .compatible = "maxim,max98360a" }, 156 {} 157 }; 158 MODULE_DEVICE_TABLE(of, max98357a_device_id); 159 #endif 160 161 #ifdef CONFIG_ACPI 162 static const struct acpi_device_id max98357a_acpi_match[] = { 163 { "MX98357A", 0 }, 164 { "MX98360A", 0 }, 165 {}, 166 }; 167 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 168 #endif 169 170 static struct platform_driver max98357a_platform_driver = { 171 .driver = { 172 .name = "max98357a", 173 .of_match_table = of_match_ptr(max98357a_device_id), 174 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 175 }, 176 .probe = max98357a_platform_probe, 177 }; 178 module_platform_driver(max98357a_platform_driver); 179 180 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 181 MODULE_LICENSE("GPL v2"); 182