1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // rt1015p.c -- RT1015P ALSA SoC audio amplifier driver 4 // 5 // Copyright 2020 The Linux Foundation. All rights reserved. 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/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 rt1015p_priv { 23 struct gpio_desc *sdb; 24 bool calib_done; 25 }; 26 27 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w, 28 struct snd_kcontrol *kcontrol, int event) 29 { 30 struct snd_soc_component *component = 31 snd_soc_dapm_to_component(w->dapm); 32 struct rt1015p_priv *rt1015p = 33 snd_soc_component_get_drvdata(component); 34 35 if (!rt1015p->sdb) 36 return 0; 37 38 switch (event) { 39 case SND_SOC_DAPM_PRE_PMU: 40 gpiod_set_value_cansleep(rt1015p->sdb, 1); 41 dev_dbg(component->dev, "set sdb to 1"); 42 43 if (!rt1015p->calib_done) { 44 msleep(300); 45 rt1015p->calib_done = true; 46 } 47 break; 48 case SND_SOC_DAPM_POST_PMD: 49 gpiod_set_value_cansleep(rt1015p->sdb, 0); 50 dev_dbg(component->dev, "set sdb to 0"); 51 break; 52 default: 53 break; 54 } 55 56 return 0; 57 } 58 59 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = { 60 SND_SOC_DAPM_OUTPUT("Speaker"), 61 SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0, 62 rt1015p_sdb_event, 63 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), 64 }; 65 66 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = { 67 {"SDB", NULL, "HiFi Playback"}, 68 {"Speaker", NULL, "SDB"}, 69 }; 70 71 #ifdef CONFIG_PM 72 static int rt1015p_suspend(struct snd_soc_component *component) 73 { 74 struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component); 75 76 rt1015p->calib_done = false; 77 return 0; 78 } 79 #else 80 #define rt1015p_suspend NULL 81 #endif 82 83 static const struct snd_soc_component_driver rt1015p_component_driver = { 84 .suspend = rt1015p_suspend, 85 .dapm_widgets = rt1015p_dapm_widgets, 86 .num_dapm_widgets = ARRAY_SIZE(rt1015p_dapm_widgets), 87 .dapm_routes = rt1015p_dapm_routes, 88 .num_dapm_routes = ARRAY_SIZE(rt1015p_dapm_routes), 89 .idle_bias_on = 1, 90 .use_pmdown_time = 1, 91 .endianness = 1, 92 .non_legacy_dai_naming = 1, 93 }; 94 95 static struct snd_soc_dai_driver rt1015p_dai_driver = { 96 .name = "HiFi", 97 .playback = { 98 .stream_name = "HiFi Playback", 99 .formats = SNDRV_PCM_FMTBIT_S24 | 100 SNDRV_PCM_FMTBIT_S32, 101 .rates = SNDRV_PCM_RATE_48000, 102 .channels_min = 1, 103 .channels_max = 2, 104 }, 105 }; 106 107 static int rt1015p_platform_probe(struct platform_device *pdev) 108 { 109 struct rt1015p_priv *rt1015p; 110 111 rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL); 112 if (!rt1015p) 113 return -ENOMEM; 114 115 rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev, 116 "sdb", GPIOD_OUT_LOW); 117 if (IS_ERR(rt1015p->sdb)) 118 return PTR_ERR(rt1015p->sdb); 119 120 dev_set_drvdata(&pdev->dev, rt1015p); 121 122 return devm_snd_soc_register_component(&pdev->dev, 123 &rt1015p_component_driver, 124 &rt1015p_dai_driver, 1); 125 } 126 127 #ifdef CONFIG_OF 128 static const struct of_device_id rt1015p_device_id[] = { 129 { .compatible = "realtek,rt1015p" }, 130 {} 131 }; 132 MODULE_DEVICE_TABLE(of, rt1015p_device_id); 133 #endif 134 135 #ifdef CONFIG_ACPI 136 static const struct acpi_device_id rt1015p_acpi_match[] = { 137 { "RTL1015", 0}, 138 { }, 139 }; 140 MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match); 141 #endif 142 143 static struct platform_driver rt1015p_platform_driver = { 144 .driver = { 145 .name = "rt1015p", 146 .of_match_table = of_match_ptr(rt1015p_device_id), 147 .acpi_match_table = ACPI_PTR(rt1015p_acpi_match), 148 }, 149 .probe = rt1015p_platform_probe, 150 }; 151 module_platform_driver(rt1015p_platform_driver); 152 153 MODULE_DESCRIPTION("ASoC RT1015P driver"); 154 MODULE_LICENSE("GPL v2"); 155