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/delay.h> 8 #include <linux/device.h> 9 #include <linux/err.h> 10 #include <linux/gpio.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 rt1015p_priv { 22 struct gpio_desc *sdb; 23 bool calib_done; 24 }; 25 26 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w, 27 struct snd_kcontrol *kcontrol, int event) 28 { 29 struct snd_soc_component *component = 30 snd_soc_dapm_to_component(w->dapm); 31 struct rt1015p_priv *rt1015p = 32 snd_soc_component_get_drvdata(component); 33 34 if (!rt1015p->sdb) 35 return 0; 36 37 switch (event) { 38 case SND_SOC_DAPM_PRE_PMU: 39 gpiod_set_value_cansleep(rt1015p->sdb, 1); 40 dev_dbg(component->dev, "set sdb to 1"); 41 42 if (!rt1015p->calib_done) { 43 msleep(300); 44 rt1015p->calib_done = true; 45 } 46 break; 47 case SND_SOC_DAPM_POST_PMD: 48 gpiod_set_value_cansleep(rt1015p->sdb, 0); 49 dev_dbg(component->dev, "set sdb to 0"); 50 break; 51 default: 52 break; 53 } 54 55 return 0; 56 } 57 58 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = { 59 SND_SOC_DAPM_OUTPUT("Speaker"), 60 SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0, 61 rt1015p_sdb_event, 62 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), 63 }; 64 65 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = { 66 {"SDB", NULL, "HiFi Playback"}, 67 {"Speaker", NULL, "SDB"}, 68 }; 69 70 #ifdef CONFIG_PM 71 static int rt1015p_suspend(struct snd_soc_component *component) 72 { 73 struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component); 74 75 rt1015p->calib_done = false; 76 return 0; 77 } 78 #else 79 #define rt1015p_suspend NULL 80 #endif 81 82 static const struct snd_soc_component_driver rt1015p_component_driver = { 83 .suspend = rt1015p_suspend, 84 .dapm_widgets = rt1015p_dapm_widgets, 85 .num_dapm_widgets = ARRAY_SIZE(rt1015p_dapm_widgets), 86 .dapm_routes = rt1015p_dapm_routes, 87 .num_dapm_routes = ARRAY_SIZE(rt1015p_dapm_routes), 88 .idle_bias_on = 1, 89 .use_pmdown_time = 1, 90 .endianness = 1, 91 .non_legacy_dai_naming = 1, 92 }; 93 94 static struct snd_soc_dai_driver rt1015p_dai_driver = { 95 .name = "HiFi", 96 .playback = { 97 .stream_name = "HiFi Playback", 98 .formats = SNDRV_PCM_FMTBIT_S24, 99 .rates = SNDRV_PCM_RATE_48000, 100 .channels_min = 1, 101 .channels_max = 2, 102 }, 103 }; 104 105 static int rt1015p_platform_probe(struct platform_device *pdev) 106 { 107 struct rt1015p_priv *rt1015p; 108 109 rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL); 110 if (!rt1015p) 111 return -ENOMEM; 112 113 rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev, 114 "sdb", GPIOD_OUT_LOW); 115 if (IS_ERR(rt1015p->sdb)) 116 return PTR_ERR(rt1015p->sdb); 117 118 dev_set_drvdata(&pdev->dev, rt1015p); 119 120 return devm_snd_soc_register_component(&pdev->dev, 121 &rt1015p_component_driver, 122 &rt1015p_dai_driver, 1); 123 } 124 125 #ifdef CONFIG_OF 126 static const struct of_device_id rt1015p_device_id[] = { 127 { .compatible = "realtek,rt1015p" }, 128 {} 129 }; 130 MODULE_DEVICE_TABLE(of, rt1015p_device_id); 131 #endif 132 133 static struct platform_driver rt1015p_platform_driver = { 134 .driver = { 135 .name = "rt1015p", 136 .of_match_table = of_match_ptr(rt1015p_device_id), 137 }, 138 .probe = rt1015p_platform_probe, 139 }; 140 module_platform_driver(rt1015p_platform_driver); 141 142 MODULE_DESCRIPTION("ASoC RT1015P driver"); 143 MODULE_LICENSE("GPL v2"); 144