| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * dmic.c -- SoC audio for Generic Digital MICs |
| * |
| * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/gpio.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/soc.h> |
| #include <sound/soc-dapm.h> |
| |
| #define MAX_MODESWITCH_DELAY 70 |
| static int modeswitch_delay; |
| module_param(modeswitch_delay, uint, 0644); |
| |
| static int wakeup_delay; |
| module_param(wakeup_delay, uint, 0644); |
| |
| struct dmic { |
| struct gpio_desc *gpio_en; |
| int wakeup_delay; |
| /* Delay after DMIC mode switch */ |
| int modeswitch_delay; |
| }; |
| |
| static int dmic_daiops_trigger(struct snd_pcm_substream *substream, |
| int cmd, struct snd_soc_dai *dai) |
| { |
| struct snd_soc_component *component = dai->component; |
| struct dmic *dmic = snd_soc_component_get_drvdata(component); |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_STOP: |
| if (dmic->modeswitch_delay) |
| mdelay(dmic->modeswitch_delay); |
| |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static const struct snd_soc_dai_ops dmic_dai_ops = { |
| .trigger = dmic_daiops_trigger, |
| }; |
| |
| static int dmic_aif_event(struct snd_soc_dapm_widget *w, |
| struct snd_kcontrol *kcontrol, int event) { |
| struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); |
| struct dmic *dmic = snd_soc_component_get_drvdata(component); |
| |
| switch (event) { |
| case SND_SOC_DAPM_POST_PMU: |
| if (dmic->gpio_en) |
| gpiod_set_value_cansleep(dmic->gpio_en, 1); |
| |
| if (dmic->wakeup_delay) |
| msleep(dmic->wakeup_delay); |
| break; |
| case SND_SOC_DAPM_POST_PMD: |
| if (dmic->gpio_en) |
| gpiod_set_value_cansleep(dmic->gpio_en, 0); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static struct snd_soc_dai_driver dmic_dai = { |
| .name = "dmic-hifi", |
| .capture = { |
| .stream_name = "Capture", |
| .channels_min = 1, |
| .channels_max = 8, |
| .rates = SNDRV_PCM_RATE_CONTINUOUS, |
| .formats = SNDRV_PCM_FMTBIT_S32_LE |
| | SNDRV_PCM_FMTBIT_S24_LE |
| | SNDRV_PCM_FMTBIT_S16_LE |
| | SNDRV_PCM_FMTBIT_DSD_U8 |
| | SNDRV_PCM_FMTBIT_DSD_U16_LE |
| | SNDRV_PCM_FMTBIT_DSD_U32_LE, |
| }, |
| .ops = &dmic_dai_ops, |
| }; |
| |
| static int dmic_component_probe(struct snd_soc_component *component) |
| { |
| struct dmic *dmic; |
| |
| dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL); |
| if (!dmic) |
| return -ENOMEM; |
| |
| dmic->gpio_en = devm_gpiod_get_optional(component->dev, |
| "dmicen", GPIOD_OUT_LOW); |
| if (IS_ERR(dmic->gpio_en)) |
| return PTR_ERR(dmic->gpio_en); |
| |
| device_property_read_u32(component->dev, "wakeup-delay-ms", |
| &dmic->wakeup_delay); |
| device_property_read_u32(component->dev, "modeswitch-delay-ms", |
| &dmic->modeswitch_delay); |
| if (wakeup_delay) |
| dmic->wakeup_delay = wakeup_delay; |
| if (modeswitch_delay) |
| dmic->modeswitch_delay = modeswitch_delay; |
| |
| if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY) |
| dmic->modeswitch_delay = MAX_MODESWITCH_DELAY; |
| |
| snd_soc_component_set_drvdata(component, dmic); |
| |
| return 0; |
| } |
| |
| static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = { |
| SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0, |
| SND_SOC_NOPM, 0, 0, dmic_aif_event, |
| SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), |
| SND_SOC_DAPM_INPUT("DMic"), |
| }; |
| |
| static const struct snd_soc_dapm_route intercon[] = { |
| {"DMIC AIF", NULL, "DMic"}, |
| }; |
| |
| static const struct snd_soc_component_driver soc_dmic = { |
| .probe = dmic_component_probe, |
| .dapm_widgets = dmic_dapm_widgets, |
| .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets), |
| .dapm_routes = intercon, |
| .num_dapm_routes = ARRAY_SIZE(intercon), |
| .idle_bias_on = 1, |
| .use_pmdown_time = 1, |
| .endianness = 1, |
| .non_legacy_dai_naming = 1, |
| }; |
| |
| static int dmic_dev_probe(struct platform_device *pdev) |
| { |
| int err; |
| u32 chans; |
| struct snd_soc_dai_driver *dai_drv = &dmic_dai; |
| |
| if (pdev->dev.of_node) { |
| err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans); |
| if (err && (err != -EINVAL)) |
| return err; |
| |
| if (!err) { |
| if (chans < 1 || chans > 8) |
| return -EINVAL; |
| |
| dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL); |
| if (!dai_drv) |
| return -ENOMEM; |
| |
| memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv)); |
| dai_drv->capture.channels_max = chans; |
| } |
| } |
| |
| return devm_snd_soc_register_component(&pdev->dev, |
| &soc_dmic, dai_drv, 1); |
| } |
| |
| MODULE_ALIAS("platform:dmic-codec"); |
| |
| static const struct of_device_id dmic_dev_match[] = { |
| {.compatible = "dmic-codec"}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, dmic_dev_match); |
| |
| static struct platform_driver dmic_driver = { |
| .driver = { |
| .name = "dmic-codec", |
| .of_match_table = dmic_dev_match, |
| }, |
| .probe = dmic_dev_probe, |
| }; |
| |
| module_platform_driver(dmic_driver); |
| |
| MODULE_DESCRIPTION("Generic DMIC driver"); |
| MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
| MODULE_LICENSE("GPL"); |