diff options
Diffstat (limited to 'sound/soc/codecs/dmic.c')
| -rw-r--r-- | sound/soc/codecs/dmic.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c new file mode 100644 index 0000000000..4fd6f97e5a --- /dev/null +++ b/sound/soc/codecs/dmic.c @@ -0,0 +1,193 @@ +// 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, +}; + +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"); |