1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * sound/soc/codecs/wm8782.c 4 * simple, strap-pin configured 24bit 2ch ADC 5 * 6 * Copyright: 2011 Raumfeld GmbH 7 * Author: Johannes Stezenbach <js@sig21.net> 8 * 9 * based on ad73311.c 10 * Copyright: Analog Devices Inc. 11 * Author: Cliff Cai <cliff.cai@analog.com> 12 */ 13 14 #include <linux/init.h> 15 #include <linux/slab.h> 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/device.h> 19 #include <linux/regulator/consumer.h> 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/ac97_codec.h> 23 #include <sound/initval.h> 24 #include <sound/soc.h> 25 26 /* regulator power supply names */ 27 static const char *supply_names[] = { 28 "Vdda", /* analog supply, 2.7V - 3.6V */ 29 "Vdd", /* digital supply, 2.7V - 5.5V */ 30 }; 31 32 struct wm8782_priv { 33 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; 34 int max_rate; 35 }; 36 37 static int wm8782_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai) 38 { 39 struct snd_pcm_runtime *runtime = sub->runtime; 40 struct wm8782_priv *priv = 41 snd_soc_component_get_drvdata(dai->component); 42 43 return snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 44 8000, priv->max_rate); 45 } 46 47 static const struct snd_soc_dapm_widget wm8782_dapm_widgets[] = { 48 SND_SOC_DAPM_INPUT("AINL"), 49 SND_SOC_DAPM_INPUT("AINR"), 50 }; 51 52 static const struct snd_soc_dapm_route wm8782_dapm_routes[] = { 53 { "Capture", NULL, "AINL" }, 54 { "Capture", NULL, "AINR" }, 55 }; 56 57 static const struct snd_soc_dai_ops wm8782_dai_ops = { 58 .startup = &wm8782_dai_startup, 59 }; 60 61 static struct snd_soc_dai_driver wm8782_dai = { 62 .name = "wm8782", 63 .capture = { 64 .stream_name = "Capture", 65 .channels_min = 2, 66 .channels_max = 2, 67 .rates = SNDRV_PCM_RATE_8000_192000, 68 .formats = SNDRV_PCM_FMTBIT_S16_LE | 69 SNDRV_PCM_FMTBIT_S20_3LE | 70 SNDRV_PCM_FMTBIT_S24_LE, 71 }, 72 .ops = &wm8782_dai_ops, 73 }; 74 75 static int wm8782_soc_probe(struct snd_soc_component *component) 76 { 77 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component); 78 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 79 } 80 81 static void wm8782_soc_remove(struct snd_soc_component *component) 82 { 83 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component); 84 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 85 } 86 87 #ifdef CONFIG_PM 88 static int wm8782_soc_suspend(struct snd_soc_component *component) 89 { 90 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component); 91 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 92 return 0; 93 } 94 95 static int wm8782_soc_resume(struct snd_soc_component *component) 96 { 97 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component); 98 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 99 } 100 #else 101 #define wm8782_soc_suspend NULL 102 #define wm8782_soc_resume NULL 103 #endif /* CONFIG_PM */ 104 105 static const struct snd_soc_component_driver soc_component_dev_wm8782 = { 106 .probe = wm8782_soc_probe, 107 .remove = wm8782_soc_remove, 108 .suspend = wm8782_soc_suspend, 109 .resume = wm8782_soc_resume, 110 .dapm_widgets = wm8782_dapm_widgets, 111 .num_dapm_widgets = ARRAY_SIZE(wm8782_dapm_widgets), 112 .dapm_routes = wm8782_dapm_routes, 113 .num_dapm_routes = ARRAY_SIZE(wm8782_dapm_routes), 114 .idle_bias_on = 1, 115 .use_pmdown_time = 1, 116 .endianness = 1, 117 }; 118 119 static int wm8782_probe(struct platform_device *pdev) 120 { 121 struct device *dev = &pdev->dev; 122 struct device_node *np = dev->of_node; 123 struct wm8782_priv *priv; 124 int ret, i, fsampen; 125 126 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 127 if (!priv) 128 return -ENOMEM; 129 130 dev_set_drvdata(dev, priv); 131 132 for (i = 0; i < ARRAY_SIZE(supply_names); i++) 133 priv->supplies[i].supply = supply_names[i]; 134 135 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies), 136 priv->supplies); 137 if (ret < 0) 138 return ret; 139 140 // Assume lowest value by default to avoid inadvertent overclocking 141 fsampen = 0; 142 143 if (np) 144 of_property_read_u32(np, "wlf,fsampen", &fsampen); 145 146 switch (fsampen) { 147 case 0: 148 priv->max_rate = 48000; 149 break; 150 case 1: 151 priv->max_rate = 96000; 152 break; 153 case 2: 154 priv->max_rate = 192000; 155 break; 156 default: 157 dev_err(dev, "Invalid wlf,fsampen value"); 158 return -EINVAL; 159 } 160 161 return devm_snd_soc_register_component(&pdev->dev, 162 &soc_component_dev_wm8782, &wm8782_dai, 1); 163 } 164 165 #ifdef CONFIG_OF 166 static const struct of_device_id wm8782_of_match[] = { 167 { .compatible = "wlf,wm8782", }, 168 { } 169 }; 170 MODULE_DEVICE_TABLE(of, wm8782_of_match); 171 #endif 172 173 static struct platform_driver wm8782_codec_driver = { 174 .driver = { 175 .name = "wm8782", 176 .of_match_table = of_match_ptr(wm8782_of_match), 177 }, 178 .probe = wm8782_probe, 179 }; 180 181 module_platform_driver(wm8782_codec_driver); 182 183 MODULE_DESCRIPTION("ASoC WM8782 driver"); 184 MODULE_AUTHOR("Johannes Stezenbach <js@sig21.net>"); 185 MODULE_LICENSE("GPL"); 186