1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * dmic.c -- SoC audio for Generic Digital MICs 4 * 5 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/platform_device.h> 11 #include <linux/regulator/consumer.h> 12 #include <linux/slab.h> 13 #include <linux/module.h> 14 #include <sound/core.h> 15 #include <sound/pcm.h> 16 #include <sound/soc.h> 17 #include <sound/soc-dapm.h> 18 19 #define MAX_MODESWITCH_DELAY 70 20 static int modeswitch_delay; 21 module_param(modeswitch_delay, uint, 0644); 22 23 static int wakeup_delay; 24 module_param(wakeup_delay, uint, 0644); 25 26 struct dmic { 27 struct gpio_desc *gpio_en; 28 struct regulator *vref; 29 int wakeup_delay; 30 /* Delay after DMIC mode switch */ 31 int modeswitch_delay; 32 }; 33 34 static int dmic_daiops_trigger(struct snd_pcm_substream *substream, 35 int cmd, struct snd_soc_dai *dai) 36 { 37 struct snd_soc_component *component = dai->component; 38 struct dmic *dmic = snd_soc_component_get_drvdata(component); 39 40 switch (cmd) { 41 case SNDRV_PCM_TRIGGER_STOP: 42 if (dmic->modeswitch_delay) 43 mdelay(dmic->modeswitch_delay); 44 45 break; 46 } 47 48 return 0; 49 } 50 51 static const struct snd_soc_dai_ops dmic_dai_ops = { 52 .trigger = dmic_daiops_trigger, 53 }; 54 55 static int dmic_aif_event(struct snd_soc_dapm_widget *w, 56 struct snd_kcontrol *kcontrol, int event) { 57 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); 58 struct dmic *dmic = snd_soc_component_get_drvdata(component); 59 int ret = 0; 60 61 switch (event) { 62 case SND_SOC_DAPM_POST_PMU: 63 if (dmic->gpio_en) 64 gpiod_set_value_cansleep(dmic->gpio_en, 1); 65 66 if (dmic->vref) { 67 ret = regulator_enable(dmic->vref); 68 if (ret) 69 return ret; 70 } 71 72 if (dmic->wakeup_delay) 73 msleep(dmic->wakeup_delay); 74 break; 75 case SND_SOC_DAPM_POST_PMD: 76 if (dmic->gpio_en) 77 gpiod_set_value_cansleep(dmic->gpio_en, 0); 78 79 if (dmic->vref) 80 ret = regulator_disable(dmic->vref); 81 82 break; 83 } 84 85 return ret; 86 } 87 88 static struct snd_soc_dai_driver dmic_dai = { 89 .name = "dmic-hifi", 90 .capture = { 91 .stream_name = "Capture", 92 .channels_min = 1, 93 .channels_max = 8, 94 .rates = SNDRV_PCM_RATE_CONTINUOUS, 95 .formats = SNDRV_PCM_FMTBIT_S32_LE 96 | SNDRV_PCM_FMTBIT_S24_LE 97 | SNDRV_PCM_FMTBIT_S16_LE 98 | SNDRV_PCM_FMTBIT_DSD_U8 99 | SNDRV_PCM_FMTBIT_DSD_U16_LE 100 | SNDRV_PCM_FMTBIT_DSD_U32_LE 101 | SNDRV_PCM_FMTBIT_DSD_U16_BE 102 | SNDRV_PCM_FMTBIT_DSD_U32_BE, 103 }, 104 .ops = &dmic_dai_ops, 105 }; 106 107 static int dmic_component_probe(struct snd_soc_component *component) 108 { 109 struct dmic *dmic; 110 111 dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL); 112 if (!dmic) 113 return -ENOMEM; 114 115 dmic->vref = devm_regulator_get_optional(component->dev, "vref"); 116 if (IS_ERR(dmic->vref)) { 117 if (PTR_ERR(dmic->vref) != -ENODEV) 118 return dev_err_probe(component->dev, PTR_ERR(dmic->vref), 119 "Failed to get vref\n"); 120 dmic->vref = NULL; 121 } 122 123 dmic->gpio_en = devm_gpiod_get_optional(component->dev, 124 "dmicen", GPIOD_OUT_LOW); 125 if (IS_ERR(dmic->gpio_en)) 126 return PTR_ERR(dmic->gpio_en); 127 128 device_property_read_u32(component->dev, "wakeup-delay-ms", 129 &dmic->wakeup_delay); 130 device_property_read_u32(component->dev, "modeswitch-delay-ms", 131 &dmic->modeswitch_delay); 132 if (wakeup_delay) 133 dmic->wakeup_delay = wakeup_delay; 134 if (modeswitch_delay) 135 dmic->modeswitch_delay = modeswitch_delay; 136 137 if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY) 138 dmic->modeswitch_delay = MAX_MODESWITCH_DELAY; 139 140 snd_soc_component_set_drvdata(component, dmic); 141 142 return 0; 143 } 144 145 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = { 146 SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0, 147 SND_SOC_NOPM, 0, 0, dmic_aif_event, 148 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 149 SND_SOC_DAPM_INPUT("DMic"), 150 }; 151 152 static const struct snd_soc_dapm_route intercon[] = { 153 {"DMIC AIF", NULL, "DMic"}, 154 }; 155 156 static const struct snd_soc_component_driver soc_dmic = { 157 .probe = dmic_component_probe, 158 .dapm_widgets = dmic_dapm_widgets, 159 .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets), 160 .dapm_routes = intercon, 161 .num_dapm_routes = ARRAY_SIZE(intercon), 162 .idle_bias_on = 1, 163 .use_pmdown_time = 1, 164 .endianness = 1, 165 }; 166 167 static int dmic_dev_probe(struct platform_device *pdev) 168 { 169 int err; 170 u32 chans; 171 struct snd_soc_dai_driver *dai_drv = &dmic_dai; 172 173 if (pdev->dev.of_node) { 174 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans); 175 if (err && (err != -EINVAL)) 176 return err; 177 178 if (!err) { 179 if (chans < 1 || chans > 8) 180 return -EINVAL; 181 182 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL); 183 if (!dai_drv) 184 return -ENOMEM; 185 186 memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv)); 187 dai_drv->capture.channels_max = chans; 188 } 189 } 190 191 return devm_snd_soc_register_component(&pdev->dev, 192 &soc_dmic, dai_drv, 1); 193 } 194 195 MODULE_ALIAS("platform:dmic-codec"); 196 197 static const struct of_device_id dmic_dev_match[] = { 198 {.compatible = "dmic-codec"}, 199 {} 200 }; 201 MODULE_DEVICE_TABLE(of, dmic_dev_match); 202 203 static struct platform_driver dmic_driver = { 204 .driver = { 205 .name = "dmic-codec", 206 .of_match_table = dmic_dev_match, 207 }, 208 .probe = dmic_dev_probe, 209 }; 210 211 module_platform_driver(dmic_driver); 212 213 MODULE_DESCRIPTION("Generic DMIC driver"); 214 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 215 MODULE_LICENSE("GPL"); 216