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(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(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 }, 87 .ops = &dmic_dai_ops, 88 }; 89 90 static int dmic_component_probe(struct snd_soc_component *component) 91 { 92 struct dmic *dmic; 93 94 dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL); 95 if (!dmic) 96 return -ENOMEM; 97 98 dmic->gpio_en = devm_gpiod_get_optional(component->dev, 99 "dmicen", GPIOD_OUT_LOW); 100 if (IS_ERR(dmic->gpio_en)) 101 return PTR_ERR(dmic->gpio_en); 102 103 device_property_read_u32(component->dev, "wakeup-delay-ms", 104 &dmic->wakeup_delay); 105 device_property_read_u32(component->dev, "modeswitch-delay-ms", 106 &dmic->modeswitch_delay); 107 if (wakeup_delay) 108 dmic->wakeup_delay = wakeup_delay; 109 if (modeswitch_delay) 110 dmic->modeswitch_delay = modeswitch_delay; 111 112 if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY) 113 dmic->modeswitch_delay = MAX_MODESWITCH_DELAY; 114 115 snd_soc_component_set_drvdata(component, dmic); 116 117 return 0; 118 } 119 120 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = { 121 SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0, 122 SND_SOC_NOPM, 0, 0, dmic_aif_event, 123 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), 124 SND_SOC_DAPM_INPUT("DMic"), 125 }; 126 127 static const struct snd_soc_dapm_route intercon[] = { 128 {"DMIC AIF", NULL, "DMic"}, 129 }; 130 131 static const struct snd_soc_component_driver soc_dmic = { 132 .probe = dmic_component_probe, 133 .dapm_widgets = dmic_dapm_widgets, 134 .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets), 135 .dapm_routes = intercon, 136 .num_dapm_routes = ARRAY_SIZE(intercon), 137 .idle_bias_on = 1, 138 .use_pmdown_time = 1, 139 .endianness = 1, 140 .non_legacy_dai_naming = 1, 141 }; 142 143 static int dmic_dev_probe(struct platform_device *pdev) 144 { 145 int err; 146 u32 chans; 147 struct snd_soc_dai_driver *dai_drv = &dmic_dai; 148 149 if (pdev->dev.of_node) { 150 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans); 151 if (err && (err != -EINVAL)) 152 return err; 153 154 if (!err) { 155 if (chans < 1 || chans > 8) 156 return -EINVAL; 157 158 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL); 159 if (!dai_drv) 160 return -ENOMEM; 161 162 memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv)); 163 dai_drv->capture.channels_max = chans; 164 } 165 } 166 167 return devm_snd_soc_register_component(&pdev->dev, 168 &soc_dmic, dai_drv, 1); 169 } 170 171 MODULE_ALIAS("platform:dmic-codec"); 172 173 static const struct of_device_id dmic_dev_match[] = { 174 {.compatible = "dmic-codec"}, 175 {} 176 }; 177 MODULE_DEVICE_TABLE(of, dmic_dev_match); 178 179 static struct platform_driver dmic_driver = { 180 .driver = { 181 .name = "dmic-codec", 182 .of_match_table = dmic_dev_match, 183 }, 184 .probe = dmic_dev_probe, 185 }; 186 187 module_platform_driver(dmic_driver); 188 189 MODULE_DESCRIPTION("Generic DMIC driver"); 190 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 191 MODULE_LICENSE("GPL"); 192