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