165 lines
4.1 KiB
C
165 lines
4.1 KiB
C
/*
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* dmic.c -- SoC audio for Generic Digital MICs
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*
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* Author: Liam Girdwood <lrg@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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struct dmic {
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struct gpio_desc *gpio_en;
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int wakeup_delay;
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};
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static int dmic_aif_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kcontrol, int event) {
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struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
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struct dmic *dmic = snd_soc_component_get_drvdata(component);
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switch (event) {
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case SND_SOC_DAPM_POST_PMU:
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if (dmic->gpio_en)
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gpiod_set_value(dmic->gpio_en, 1);
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if (dmic->wakeup_delay)
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msleep(dmic->wakeup_delay);
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break;
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case SND_SOC_DAPM_POST_PMD:
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if (dmic->gpio_en)
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gpiod_set_value(dmic->gpio_en, 0);
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break;
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}
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return 0;
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}
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static struct snd_soc_dai_driver dmic_dai = {
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.name = "dmic-hifi",
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.capture = {
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.stream_name = "Capture",
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.channels_min = 1,
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.channels_max = 8,
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.rates = SNDRV_PCM_RATE_CONTINUOUS,
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.formats = SNDRV_PCM_FMTBIT_S32_LE
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| SNDRV_PCM_FMTBIT_S24_LE
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| SNDRV_PCM_FMTBIT_S16_LE,
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},
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};
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static int dmic_component_probe(struct snd_soc_component *component)
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{
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struct dmic *dmic;
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dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL);
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if (!dmic)
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return -ENOMEM;
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dmic->gpio_en = devm_gpiod_get_optional(component->dev,
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"dmicen", GPIOD_OUT_LOW);
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if (IS_ERR(dmic->gpio_en))
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return PTR_ERR(dmic->gpio_en);
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device_property_read_u32(component->dev, "wakeup-delay-ms",
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&dmic->wakeup_delay);
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snd_soc_component_set_drvdata(component, dmic);
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return 0;
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}
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static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
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SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0,
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SND_SOC_NOPM, 0, 0, dmic_aif_event,
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SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
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SND_SOC_DAPM_INPUT("DMic"),
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};
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static const struct snd_soc_dapm_route intercon[] = {
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{"DMIC AIF", NULL, "DMic"},
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};
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static const struct snd_soc_component_driver soc_dmic = {
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.probe = dmic_component_probe,
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.dapm_widgets = dmic_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
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.dapm_routes = intercon,
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.num_dapm_routes = ARRAY_SIZE(intercon),
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.idle_bias_on = 1,
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.use_pmdown_time = 1,
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.endianness = 1,
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.non_legacy_dai_naming = 1,
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};
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static int dmic_dev_probe(struct platform_device *pdev)
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{
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int err;
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u32 chans;
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struct snd_soc_dai_driver *dai_drv = &dmic_dai;
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if (pdev->dev.of_node) {
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err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
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if (err && (err != -EINVAL))
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return err;
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if (!err) {
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if (chans < 1 || chans > 8)
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return -EINVAL;
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dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
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if (!dai_drv)
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return -ENOMEM;
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memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv));
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dai_drv->capture.channels_max = chans;
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}
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}
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return devm_snd_soc_register_component(&pdev->dev,
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&soc_dmic, dai_drv, 1);
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}
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MODULE_ALIAS("platform:dmic-codec");
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static const struct of_device_id dmic_dev_match[] = {
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{.compatible = "dmic-codec"},
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{}
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};
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static struct platform_driver dmic_driver = {
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.driver = {
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.name = "dmic-codec",
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.of_match_table = dmic_dev_match,
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},
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.probe = dmic_dev_probe,
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};
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module_platform_driver(dmic_driver);
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MODULE_DESCRIPTION("Generic DMIC driver");
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MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
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MODULE_LICENSE("GPL");
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