141 lines
3.4 KiB
C
141 lines
3.4 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/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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static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_dai *dai)
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{
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struct gpio_desc *dmic_en = snd_soc_dai_get_drvdata(dai);
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if (!dmic_en)
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return 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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gpiod_set_value(dmic_en, 1);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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gpiod_set_value(dmic_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 const struct snd_soc_dai_ops dmic_dai_ops = {
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.trigger = dmic_daiops_trigger,
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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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.ops = &dmic_dai_ops,
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};
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static int dmic_codec_probe(struct snd_soc_codec *codec)
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{
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struct gpio_desc *dmic_en;
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dmic_en = devm_gpiod_get_optional(codec->dev,
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"dmicen", GPIOD_OUT_LOW);
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if (IS_ERR(dmic_en))
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return PTR_ERR(dmic_en);
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snd_soc_codec_set_drvdata(codec, dmic_en);
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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("DMIC AIF", "Capture", 0,
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SND_SOC_NOPM, 0, 0),
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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_codec_driver soc_dmic = {
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.probe = dmic_codec_probe,
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.component_driver = {
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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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},
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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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return snd_soc_register_codec(&pdev->dev,
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&soc_dmic, &dmic_dai, 1);
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}
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static int dmic_dev_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_codec(&pdev->dev);
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return 0;
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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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.remove = dmic_dev_remove,
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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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