v4.19.13 snapshot.
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
new file mode 100644
index 0000000..8c4926d
--- /dev/null
+++ b/sound/soc/codecs/dmic.c
@@ -0,0 +1,164 @@
+/*
+ * dmic.c -- SoC audio for Generic Digital MICs
+ *
+ * Author: Liam Girdwood <lrg@slimlogic.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#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>
+
+struct dmic {
+ struct gpio_desc *gpio_en;
+ int wakeup_delay;
+};
+
+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(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(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,
+ },
+};
+
+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);
+
+ 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"},
+ {}
+};
+
+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");