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// 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,
},
.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");
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