asoc: codecs: Add swr dmic codec

Add initial changes for supporting swr dmic
where each codec can support single mic recording
over soundwire port.

Change-Id: I0319bfb5c850d48b563f46d5dd77f21d4a83f029
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>

asoc/codecs/swr-dmic.c

@@ -0,0 +1,718 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/printk.h>
+#include <linux/bitops.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/debugfs.h>
+#include <soc/soundwire.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/tlv.h>
+#include <asoc/msm-cdc-pinctrl.h>
+#include <dt-bindings/sound/audio-codec-port-types.h>
+#include "swr-dmic.h"
+
+#define itoa(x)               ('0' + x)
+#define DAI_NAME_NUM_INDEX    11
+#define AIF_NAME_NUM_INDEX    12
+#define DEFAULT_CODEC_NAME    "swr_dmic_tx0"
+#define DEFAULT_AIF_NAME      "SWR_DMIC_AIF0 Playback"
+
+/*
+ * Private data Structure for swr-dmic. All parameters related to
+ * external mic codec needs to be defined here.
+ */
+struct swr_dmic_priv {
+	struct device *dev;
+	struct swr_device *swr_slave;
+	struct snd_soc_component *component;
+	struct snd_soc_component_driver *driver;
+	struct snd_soc_dai_driver *dai_driver;
+	struct device_node *swr_dmic_vdd_np;
+	int tx_mode;
+	u8 tx_master_port_map[SWR_DMIC_MAX_PORTS];
+};
+
+const char *codec_name_list[] = {
+	"swr-dmic-01",
+	"swr-dmic-02",
+	"swr-dmic-03",
+	"swr-dmic-04",
+	"swr-dmic-05",
+};
+
+static int get_master_port(int val)
+{
+	int master_port = 0;
+
+	switch(val) {
+	case 0:
+		master_port = SWRM_TX1_CH1;
+		break;
+	case 1:
+		master_port = SWRM_TX1_CH2;
+		break;
+	case 2:
+		master_port = SWRM_TX1_CH3;
+		break;
+	case 3:
+		master_port = SWRM_TX1_CH4;
+		break;
+	case 4:
+		master_port = SWRM_TX2_CH1;
+		break;
+	case 5:
+		master_port = SWRM_TX2_CH2;
+		break;
+	case 6:
+		master_port = SWRM_TX2_CH3;
+		break;
+	case 7:
+		master_port = SWRM_TX2_CH4;
+		break;
+	case 8:
+		master_port = SWRM_TX3_CH1;
+		break;
+	case 9:
+		master_port = SWRM_TX3_CH2;
+		break;
+	case 10:
+		master_port = SWRM_TX3_CH3;
+		break;
+	case 11:
+		master_port = SWRM_TX3_CH4;
+		break;
+	case 12:
+		master_port = SWRM_PCM_IN;
+		break;
+	default:
+		master_port = SWRM_TX1_CH1;
+		pr_debug("%s: undefined value, fall back to default master_port: %d\n",
+			 __func__, master_port);
+		break;
+	}
+
+	pr_debug("%s: master_port: %d\n", __func__, master_port);
+	return master_port;
+}
+
+static int get_master_port_val(int master_port)
+{
+	int val = 0;
+
+	switch (master_port) {
+	case SWRM_TX1_CH1:
+		val = 0;
+		break;
+	case SWRM_TX1_CH2:
+		val = 1;
+		break;
+	case SWRM_TX1_CH3:
+		val = 2;
+		break;
+	case SWRM_TX1_CH4:
+		val = 3;
+		break;
+	case SWRM_TX2_CH1:
+		val = 4;
+		break;
+	case SWRM_TX2_CH2:
+		val = 5;
+		break;
+	case SWRM_TX2_CH3:
+		val = 6;
+		break;
+	case SWRM_TX2_CH4:
+		val = 7;
+		break;
+	case SWRM_TX3_CH1:
+		val = 8;
+		break;
+	case SWRM_TX3_CH2:
+		val = 9;
+		break;
+	case SWRM_TX3_CH3:
+		val = 10;
+		break;
+	case SWRM_TX3_CH4:
+		val = 11;
+		break;
+	case SWRM_PCM_IN:
+		val = 12;
+		break;
+	default:
+		val = 0;
+		pr_debug("%s: undefined master_port:%d, fallback to default val: %d\n",
+			 __func__, master_port, val);
+		break;
+	}
+
+	pr_debug("%s: master_port:%d val: %d\n", __func__, master_port, val);
+	return val;
+}
+
+static inline int swr_dmic_tx_get_slave_port_type_idx(const char *wname,
+				      unsigned int *port_idx)
+{
+	u8 port_type;
+
+	if (strnstr(wname, "HIFI", sizeof("HIFI")))
+		port_type = SWR_DMIC_HIFI_PORT;
+	else if (strnstr(wname, "LP", sizeof("LP")))
+		port_type = SWR_DMIC_LP_PORT;
+	else
+		return -EINVAL;
+
+	*port_idx = port_type;
+	return 0;
+}
+
+static int swr_dmic_tx_master_port_get(struct snd_kcontrol *kcontrol,
+					struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component =
+				snd_soc_kcontrol_component(kcontrol);
+	struct swr_dmic_priv *swr_dmic = snd_soc_component_get_drvdata(component);
+	int ret = 0;
+	int slave_port_idx;
+
+	ret = swr_dmic_tx_get_slave_port_type_idx(kcontrol->id.name,
+							&slave_port_idx);
+	if (ret) {
+		dev_dbg(component->dev, "%s: invalid port string\n", __func__);
+		return ret;
+	}
+
+	if (slave_port_idx >= 0 &&
+		slave_port_idx < SWR_DMIC_MAX_PORTS)
+		ucontrol->value.integer.value[0] = get_master_port_val(
+				swr_dmic->tx_master_port_map[slave_port_idx]);
+
+	dev_dbg(component->dev, "%s: ucontrol->value.integer.value[0] = %ld\n",
+			__func__, ucontrol->value.integer.value[0]);
+	return 0;
+}
+
+static int swr_dmic_tx_master_port_put(struct snd_kcontrol *kcontrol,
+					struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component =
+				snd_soc_kcontrol_component(kcontrol);
+	struct swr_dmic_priv *swr_dmic = snd_soc_component_get_drvdata(component);
+	int ret = 0;
+	int slave_port_idx;
+
+	ret  = swr_dmic_tx_get_slave_port_type_idx(kcontrol->id.name,
+							&slave_port_idx);
+	if (ret) {
+		dev_dbg(component->dev, "%s: invalid port string\n", __func__);
+		return ret;
+	}
+
+
+	dev_dbg(component->dev, "%s: slave_port_idx: %d",
+			__func__, slave_port_idx);
+	dev_dbg(component->dev, "%s: ucontrol->value.enumerated.item[0] = %ld\n",
+			__func__, ucontrol->value.enumerated.item[0]);
+	if (slave_port_idx >= 0 &&
+		slave_port_idx < SWR_DMIC_MAX_PORTS)
+		swr_dmic->tx_master_port_map[slave_port_idx] =
+				get_master_port(
+					ucontrol->value.enumerated.item[0]);
+
+	return 0;
+}
+
+static int swr_dmic_vdd_ctrl(struct swr_dmic_priv *swr_dmic, bool enable)
+{
+	int ret = 0;
+
+	if (swr_dmic->swr_dmic_vdd_np) {
+		if (enable)
+			ret = msm_cdc_pinctrl_select_active_state(
+							swr_dmic->swr_dmic_vdd_np);
+		else
+			ret = msm_cdc_pinctrl_select_sleep_state(
+							swr_dmic->swr_dmic_vdd_np);
+		if (ret != 0)
+			dev_err(swr_dmic->dev, "%s: Failed to turn state %d; ret=%d\n",
+				__func__, enable, ret);
+	} else {
+		dev_err(swr_dmic->dev, "%s: invalid pinctrl node\n", __func__);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int dmic_swr_ctrl(struct snd_soc_dapm_widget *w,
+			 struct snd_kcontrol *kcontrol, int event)
+{
+	int ret = 0;
+	struct snd_soc_component *component =
+			snd_soc_dapm_to_component(w->dapm);
+	struct swr_dmic_priv *swr_dmic =
+			snd_soc_component_get_drvdata(component);
+
+	u8 num_ch = 1;
+	u8 ch_mask = 0x01; // only DpnChannelEN1 register is available
+	u8 port_type = 0;
+	u32 ch_rate = 0;
+	u8 num_port = 1;
+	/*
+	 * Port 1 is high quality / 2.4 or 3.072 Mbps
+	 * Port 2 is listen low power / 0.6 or 0.768 Mbps
+	 */
+	u8 port_id = swr_dmic->tx_mode;
+	port_type = swr_dmic->tx_master_port_map[port_id];
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		ret = swr_connect_port(swr_dmic->swr_slave, &port_id, num_port,
+			&ch_mask, &ch_rate, &num_ch, &port_type);
+		break;
+	case SND_SOC_DAPM_POST_PMU:
+		ret = swr_slvdev_datapath_control(swr_dmic->swr_slave,
+			swr_dmic->swr_slave->dev_num, true);
+		break;
+	case SND_SOC_DAPM_PRE_PMD:
+		ret = swr_slvdev_datapath_control(swr_dmic->swr_slave,
+			swr_dmic->swr_slave->dev_num, false);
+		break;
+	case SND_SOC_DAPM_POST_PMD:
+		ret = swr_disconnect_port(swr_dmic->swr_slave, &port_id,
+					  num_port, &ch_mask, &port_type);
+		break;
+	};
+
+	return ret;
+}
+
+static const char * const tx_mode_text_swr_mic[] = {
+	"MIC_HIFI", "MIC_LP",
+};
+
+static int swr_mic_tx_mode_put(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component =
+			snd_soc_kcontrol_component(kcontrol);
+	struct swr_dmic_priv *swr_dmic =
+			snd_soc_component_get_drvdata(component);
+
+	dev_dbg(component->dev, "%s: tx_mode  = %ld\n",
+		__func__, ucontrol->value.integer.value[0]);
+
+	swr_dmic->tx_mode =  ucontrol->value.integer.value[0];
+
+	return 0;
+}
+
+static int swr_mic_tx_mode_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component =
+			snd_soc_kcontrol_component(kcontrol);
+	struct swr_dmic_priv *swr_dmic =
+			snd_soc_component_get_drvdata(component);
+
+	ucontrol->value.integer.value[0] = swr_dmic->tx_mode;
+
+	dev_dbg(component->dev, "%s: tx_mode = 0x%x\n", __func__,
+			swr_dmic->tx_mode);
+
+	return 0;
+}
+
+static const struct soc_enum tx_mode_enum_swr_mic =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(tx_mode_text_swr_mic),
+			    tx_mode_text_swr_mic);
+
+static const char * const tx_master_port_text[] = {
+	"SWRM_TX1_CH1", "SWRM_TX1_CH2", "SWRM_TX1_CH3", "SWRM_TX1_CH4",
+	"SWRM_TX2_CH1", "SWRM_TX2_CH2", "SWRM_TX2_CH3", "SWRM_TX2_CH4",
+	"SWRM_TX3_CH1", "SWRM_TX3_CH2", "SWRM_TX3_CH3", "SWRM_TX3_CH4",
+	"SWRM_PCM_IN",
+};
+
+static const struct soc_enum tx_master_port_enum =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(tx_master_port_text),
+				tx_master_port_text);
+
+static const struct snd_kcontrol_new swr_dmic_snd_controls[] = {
+	SOC_ENUM_EXT("TX MODE", tx_mode_enum_swr_mic,
+			swr_mic_tx_mode_get, swr_mic_tx_mode_put),
+
+	SOC_ENUM_EXT("HIFI PortMap", tx_master_port_enum,
+		swr_dmic_tx_master_port_get, swr_dmic_tx_master_port_put),
+	SOC_ENUM_EXT("LP PortMap", tx_master_port_enum,
+		swr_dmic_tx_master_port_get, swr_dmic_tx_master_port_put),
+};
+
+static const struct snd_kcontrol_new dmic_switch[] = {
+	SOC_DAPM_SINGLE("Switch", SND_SOC_NOPM, 0, 1, 0)
+};
+
+static const struct snd_soc_dapm_widget swr_dmic_dapm_widgets[] = {
+	SND_SOC_DAPM_MIXER_E("DMIC_SWR_MIXER", SND_SOC_NOPM, 0, 0,
+			dmic_switch, ARRAY_SIZE(dmic_switch), dmic_swr_ctrl,
+			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
+			SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD),
+
+	SND_SOC_DAPM_INPUT("SWR_DMIC"),
+
+	SND_SOC_DAPM_OUTPUT("SWR_DMIC_OUTPUT"),
+};
+
+static const struct snd_soc_dapm_route swr_dmic_audio_map[] = {
+	{"SWR_DMIC_MIXER", "Switch", "SWR_DMIC"},
+	{"SWR_DMIC_OUTPUT", NULL, "SWR_DMIC_MIXER"},
+};
+
+static int swr_dmic_codec_probe(struct snd_soc_component *component)
+{
+	struct swr_dmic_priv *swr_dmic =
+			snd_soc_component_get_drvdata(component);
+
+	if (!swr_dmic)
+		return -EINVAL;
+
+	swr_dmic->component = component;
+	return 0;
+}
+
+static void swr_dmic_codec_remove(struct snd_soc_component *component)
+{
+	struct swr_dmic_priv *swr_dmic =
+			snd_soc_component_get_drvdata(component);
+
+	swr_dmic->component = NULL;
+	return;
+}
+
+static const struct snd_soc_component_driver soc_codec_dev_swr_dmic = {
+	.name = NULL,
+	.probe = swr_dmic_codec_probe,
+	.remove = swr_dmic_codec_remove,
+	.controls = swr_dmic_snd_controls,
+	.num_controls = ARRAY_SIZE(swr_dmic_snd_controls),
+	.dapm_widgets = swr_dmic_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(swr_dmic_dapm_widgets),
+	.dapm_routes = swr_dmic_audio_map,
+	.num_dapm_routes = ARRAY_SIZE(swr_dmic_audio_map),
+};
+
+static struct snd_soc_dai_ops wsa_dai_ops = {
+};
+
+static struct snd_soc_dai_driver swr_dmic_dai[] = {
+	{
+		.name = "",
+		.id = 0,
+		.playback = {
+			.stream_name = "",
+			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
+				SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_48000 |
+				SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000),
+			.formats = (SNDRV_PCM_FMTBIT_S16_LE |
+				SNDRV_PCM_FMTBIT_S24_LE |
+				SNDRV_PCM_FMTBIT_S32_LE),
+			.rate_max = 192000,
+			.rate_min = 8000,
+			.channels_min = 1,
+			.channels_max = 2,
+		},
+		.ops = &wsa_dai_ops,
+	},
+};
+
+static int swr_dmic_probe(struct swr_device *pdev)
+{
+	int ret = 0;
+	struct swr_dmic_priv *swr_dmic;
+	int i = 0;
+	u8 devnum = 0;
+	const char *swr_dmic_name_prefix_of = NULL;
+	const char *swr_dmic_codec_name_of = NULL;
+	struct snd_soc_component *component;
+	char *dai_name;
+	char *aif_name;
+
+	swr_dmic = devm_kzalloc(&pdev->dev, sizeof(struct swr_dmic_priv),
+			    GFP_KERNEL);
+	if (!swr_dmic)
+		return -ENOMEM;
+	swr_dmic->swr_dmic_vdd_np = of_parse_phandle(pdev->dev.of_node,
+					     "qcom,swr-dmic-vdd-node", 0);
+	if (!swr_dmic->swr_dmic_vdd_np) {
+		ret = -EINVAL;
+		dev_dbg(&pdev->dev, "%s: Not using pinctrl\n", __func__);
+	}
+	swr_set_dev_data(pdev, swr_dmic);
+
+	swr_dmic->swr_slave = pdev;
+
+	ret = of_property_read_string(pdev->dev.of_node, "qcom,swr-dmic-prefix",
+				&swr_dmic_name_prefix_of);
+	if (ret) {
+		dev_dbg(&pdev->dev, "%s: Looking up %s property in node %s failed\n",
+		__func__, "qcom,swr-dmic-prefix",
+		pdev->dev.of_node->full_name);
+		goto err;
+	}
+
+	ret = of_property_read_string(pdev->dev.of_node, "qcom,codec-name",
+				&swr_dmic_codec_name_of);
+	if (ret) {
+		dev_dbg(&pdev->dev, "%s: Looking up %s property in node %s failed\n",
+		__func__, "qcom,codec-name",
+		pdev->dev.of_node->full_name);
+		goto err;
+	}
+
+	swr_dmic_vdd_ctrl(swr_dmic, true);
+	/*
+	 * Add 5msec delay to provide sufficient time for
+	 * soundwire auto enumeration of slave devices as
+	 * as per HW requirement.
+	 */
+	usleep_range(5000, 5010);
+	ret = swr_get_logical_dev_num(pdev, pdev->addr, &devnum);
+	if (ret) {
+		dev_dbg(&pdev->dev,
+			"%s get devnum %d for dev addr %lx failed\n",
+			__func__, devnum, pdev->addr);
+		goto dev_err;
+	}
+	pdev->dev_num = devnum;
+
+	swr_dmic->driver = devm_kzalloc(&pdev->dev,
+			sizeof(struct snd_soc_component_driver), GFP_KERNEL);
+	if (!swr_dmic->driver) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	memcpy(swr_dmic->driver, &soc_codec_dev_swr_dmic,
+			sizeof(struct snd_soc_component_driver));
+	swr_dmic->driver->name = devm_kzalloc(&pdev->dev,
+			strlen(swr_dmic_codec_name_of), GFP_KERNEL);
+	if (!swr_dmic->driver->name) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(codec_name_list); i++) {
+		if (!strcmp(swr_dmic_codec_name_of, codec_name_list[i]))
+			break;
+	}
+	if (i == ARRAY_SIZE(codec_name_list))
+		goto dev_err;
+
+	swr_dmic->dai_driver = devm_kzalloc(&pdev->dev,
+			sizeof(struct snd_soc_dai_driver), GFP_KERNEL);
+	if (!swr_dmic->dai_driver) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	memcpy(swr_dmic->dai_driver, swr_dmic_dai,
+			sizeof(struct snd_soc_dai_driver));
+	dai_name = devm_kzalloc(&pdev->dev, strlen(DEFAULT_CODEC_NAME),
+			GFP_KERNEL);
+	if (!dai_name) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	memcpy(dai_name, DEFAULT_CODEC_NAME, strlen(DEFAULT_CODEC_NAME));
+	dai_name[DAI_NAME_NUM_INDEX] = itoa(i);
+	swr_dmic->dai_driver->name = dai_name;
+	swr_dmic->dai_driver->id = i;
+	aif_name = devm_kzalloc(&pdev->dev, strlen(DEFAULT_AIF_NAME),
+			GFP_KERNEL);
+	if (!aif_name) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	memcpy(aif_name, DEFAULT_AIF_NAME, strlen(DEFAULT_AIF_NAME));
+	aif_name[AIF_NAME_NUM_INDEX] = itoa(i);
+	swr_dmic->dai_driver->playback.stream_name = aif_name;
+
+	ret = snd_soc_register_component(&pdev->dev, swr_dmic->driver,
+				swr_dmic->dai_driver, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: Codec registration failed\n",
+			__func__);
+		goto dev_err;
+	}
+
+	component = snd_soc_lookup_component(&pdev->dev,
+						swr_dmic->driver->name);
+	swr_dmic->component = component;
+	component->name_prefix = devm_kzalloc(&pdev->dev,
+					strlen(swr_dmic_name_prefix_of),
+	   GFP_KERNEL);
+	if (!component->name_prefix) {
+		ret = -ENOMEM;
+		goto dev_err;
+	}
+
+	return 0;
+
+dev_err:
+	swr_dmic_vdd_ctrl(swr_dmic, false);
+	swr_remove_device(pdev);
+err:
+	return ret;
+}
+
+static int swr_dmic_remove(struct swr_device *pdev)
+{
+	struct swr_dmic_priv *swr_dmic;
+
+	swr_dmic = swr_get_dev_data(pdev);
+	if (!swr_dmic) {
+		dev_err(&pdev->dev, "%s: swr_dmic is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	snd_soc_unregister_component(&pdev->dev);
+	swr_set_dev_data(pdev, NULL);
+	return 0;
+}
+
+static int swr_dmic_up(struct swr_device *pdev)
+{
+	int ret = 0;
+	struct swr_dmic_priv *swr_dmic;
+
+	swr_dmic = swr_get_dev_data(pdev);
+	if (!swr_dmic) {
+		dev_err(&pdev->dev, "%s: swr_dmic is NULL\n", __func__);
+		return -EINVAL;
+	}
+	swr_dmic_vdd_ctrl(swr_dmic, true);
+
+	return ret;
+}
+
+static int swr_dmic_down(struct swr_device *pdev)
+{
+	struct swr_dmic_priv *swr_dmic;
+	int ret = 0;
+
+	swr_dmic = swr_get_dev_data(pdev);
+	if (!swr_dmic) {
+		dev_err(&pdev->dev, "%s: swr_dmic is NULL\n", __func__);
+		return -EINVAL;
+	}
+	swr_dmic_vdd_ctrl(swr_dmic, false);
+
+	return ret;
+}
+
+static int swr_dmic_reset(struct swr_device *pdev)
+{
+	struct swr_dmic_priv *swr_dmic;
+	u8 retry = 5;
+	u8 devnum = 0;
+
+	swr_dmic = swr_get_dev_data(pdev);
+	if (!swr_dmic) {
+		dev_err(&pdev->dev, "%s: swr_dmic is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	while (swr_get_logical_dev_num(pdev, pdev->addr, &devnum) && retry--) {
+		/* Retry after 1 msec delay */
+		usleep_range(1000, 1100);
+	}
+	pdev->dev_num = devnum;
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int swr_dmic_suspend(struct device *dev)
+{
+	dev_dbg(dev, "%s: system suspend\n", __func__);
+	return 0;
+}
+
+static int swr_dmic_resume(struct device *dev)
+{
+	struct swr_dmic_priv *swr_dmic = swr_get_dev_data(to_swr_device(dev));
+
+	if (!swr_dmic) {
+		dev_err(dev, "%s: swr_dmic private data is NULL\n", __func__);
+		return -EINVAL;
+	}
+	dev_dbg(dev, "%s: system resume\n", __func__);
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops swr_dmic_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(swr_dmic_suspend, swr_dmic_resume)
+};
+
+static const struct swr_device_id swr_dmic_id[] = {
+	{"swr-dmic", 0},
+	{}
+};
+
+static const struct of_device_id swr_dmic_dt_match[] = {
+	{
+		.compatible = "qcom,swr-dmic",
+	},
+	{}
+};
+
+static struct swr_driver swr_dmic_driver = {
+	.driver = {
+		.name = "swr-dmic",
+		.owner = THIS_MODULE,
+		.pm = &swr_dmic_pm_ops,
+		.of_match_table = swr_dmic_dt_match,
+	},
+	.probe = swr_dmic_probe,
+	.remove = swr_dmic_remove,
+	.id_table = swr_dmic_id,
+	.device_up = swr_dmic_up,
+	.device_down = swr_dmic_down,
+	.reset_device = swr_dmic_reset,
+};
+
+static int __init swr_dmic_init(void)
+{
+	return swr_driver_register(&swr_dmic_driver);
+}
+
+static void __exit swr_dmic_exit(void)
+{
+	swr_driver_unregister(&swr_dmic_driver);
+}
+
+module_init(swr_dmic_init);
+module_exit(swr_dmic_exit);
+
+MODULE_DESCRIPTION("SWR DMIC driver");
+MODULE_LICENSE("GPL v2");