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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * dmic.c -- SoC audio for Generic Digital MICs4 *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 7020static int modeswitch_delay;21module_param(modeswitch_delay, uint, 0644);22 23static int wakeup_delay;24module_param(wakeup_delay, uint, 0644);25 26struct dmic {27 struct gpio_desc *gpio_en;28 int wakeup_delay;29 /* Delay after DMIC mode switch */30 int modeswitch_delay;31};32 33static 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 50static const struct snd_soc_dai_ops dmic_dai_ops = {51 .trigger = dmic_daiops_trigger,52};53 54static 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 76static 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_LE84 | SNDRV_PCM_FMTBIT_S24_LE85 | SNDRV_PCM_FMTBIT_S16_LE86 | SNDRV_PCM_FMTBIT_DSD_U887 | SNDRV_PCM_FMTBIT_DSD_U16_LE88 | SNDRV_PCM_FMTBIT_DSD_U32_LE,89 },90 .ops = &dmic_dai_ops,91};92 93static 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 123static 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 130static const struct snd_soc_dapm_route intercon[] = {131 {"DMIC AIF", NULL, "DMic"},132};133 134static 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};144 145static int dmic_dev_probe(struct platform_device *pdev)146{147 int err;148 u32 chans;149 struct snd_soc_dai_driver *dai_drv = &dmic_dai;150 151 if (pdev->dev.of_node) {152 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);153 if (err && (err != -EINVAL))154 return err;155 156 if (!err) {157 if (chans < 1 || chans > 8)158 return -EINVAL;159 160 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);161 if (!dai_drv)162 return -ENOMEM;163 164 memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv));165 dai_drv->capture.channels_max = chans;166 }167 }168 169 return devm_snd_soc_register_component(&pdev->dev,170 &soc_dmic, dai_drv, 1);171}172 173MODULE_ALIAS("platform:dmic-codec");174 175static const struct of_device_id dmic_dev_match[] = {176 {.compatible = "dmic-codec"},177 {}178};179MODULE_DEVICE_TABLE(of, dmic_dev_match);180 181static struct platform_driver dmic_driver = {182 .driver = {183 .name = "dmic-codec",184 .of_match_table = dmic_dev_match,185 },186 .probe = dmic_dev_probe,187};188 189module_platform_driver(dmic_driver);190 191MODULE_DESCRIPTION("Generic DMIC driver");192MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");193MODULE_LICENSE("GPL");194