[PATCH v6 1/5] dt-bindings: vendor-prefixes: Add Shanghai FourSemi Semiconductor Co.,Ltd

[PATCH v6 1/5] dt-bindings: vendor-prefixes: Add Shanghai FourSemi Semiconductor Co.,Ltd

[Nick Li]

Add vendor prefix for Shanghai FourSemi Semiconductor Co.,Ltd
Link: https://en.foursemi.com/

Signed-off-by: Nick Li <nick.li@foursemi.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 77160cd47..a92261b10 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -552,6 +552,8 @@ patternProperties:
     description: FocalTech Systems Co.,Ltd
   "^forlinx,.*":
     description: Baoding Forlinx Embedded Technology Co., Ltd.
+  "^foursemi,.*":
+    description: Shanghai FourSemi Semiconductor Co.,Ltd.
   "^freebox,.*":
     description: Freebox SAS
   "^freecom,.*":
-- 
2.50.1

[PATCH v6 2/5] ASoC: dt-bindings: Add FS2104/5S audio amplifiers

[Nick Li]

Add a DT schema for describing FourSemi FS2104/5S
audio amplifiers which support both I2S and I2C interface.

Signed-off-by: Nick Li <nick.li@foursemi.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
 .../bindings/sound/foursemi,fs2105s.yaml      | 101 ++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/foursemi,fs2105s.yaml

diff --git a/Documentation/devicetree/bindings/sound/foursemi,fs2105s.yaml b/Documentation/devicetree/bindings/sound/foursemi,fs2105s.yaml
new file mode 100644
index 000000000..4da735317
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/foursemi,fs2105s.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/foursemi,fs2105s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: FourSemi FS2104/5S Digital Audio Amplifier
+
+maintainers:
+  - Nick Li <nick.li@foursemi.com>
+
+description:
+  The FS2104 is a 15W Inductor-Less, Stereo, Closed-Loop,
+  Digital Input Class-D Power Amplifier with Enhanced Signal Processing.
+  The FS2105S is a 30W Inductor-Less, Stereo, Closed-Loop,
+  Digital Input Class-D Power Amplifier with Enhanced Signal Processing.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - foursemi,fs2104
+          - const: foursemi,fs2105s
+      - enum:
+          - foursemi,fs2105s
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: The clock of I2S BCLK
+
+  clock-names:
+    items:
+      - const: bclk
+
+  interrupts:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+  pvdd-supply:
+    description:
+      Regulator for power supply(PVDD in datasheet).
+
+  dvdd-supply:
+    description:
+      Regulator for digital supply(DVDD in datasheet).
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      It's the SDZ pin in datasheet, the pin is active low,
+      it will power down and reset the chip to shut down state.
+
+  firmware-name:
+    maxItems: 1
+    description: |
+      The firmware(*.bin) contains:
+      a. Register initialization settings
+      b. DSP effect parameters
+      c. Multi-scene sound effect configurations(optional)
+      It's gernerated by FourSemi's tuning tool.
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+  - pvdd-supply
+  - dvdd-supply
+  - reset-gpios
+  - firmware-name
+
+allOf:
+  - $ref: dai-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        audio-codec@68 {
+            compatible = "foursemi,fs2105s";
+            reg = <0x68>;
+            clocks = <&clocks 18>;
+            clock-names = "bclk";
+            #sound-dai-cells = <0>;
+            pvdd-supply = <&pvdd_supply>;
+            dvdd-supply = <&dvdd_supply>;
+            reset-gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+            firmware-name = "fs2105s-btl-2p0-0s.bin";
+            pinctrl-names = "default";
+            pinctrl-0 = <&fs210x_pins_default>;
+        };
+    };
-- 
2.50.1

[PATCH v6 3/5] ASoC: codecs: Add library for FourSemi audio amplifiers

[Nick Li]

This patch adds firmware loading and parsing support for FourSemi audio
amplifiers. The library handles firmware file (*.bin) generated by the
FourSemi tuning tool, which contains:
- Register initialization settings
- DSP effect parameters
- Multi-scene sound effect switching configurations(optional)

The firmware is required for proper initialization and configuration
of FourSemi amplifier devices.

Signed-off-by: Nick Li <nick.li@foursemi.com>
---
 sound/soc/codecs/Kconfig      |   3 +
 sound/soc/codecs/Makefile     |   2 +
 sound/soc/codecs/fs-amp-lib.c | 265 ++++++++++++++++++++++++++++++++++
 sound/soc/codecs/fs-amp-lib.h | 150 +++++++++++++++++++
 4 files changed, 420 insertions(+)
 create mode 100644 sound/soc/codecs/fs-amp-lib.c
 create mode 100644 sound/soc/codecs/fs-amp-lib.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 6d7e4725d..ecdc05ef3 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -1232,6 +1232,9 @@ config SND_SOC_FRAMER
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-soc-framer.
 
+config SND_SOC_FS_AMP_LIB
+	select CRC16
+	tristate
 
 config SND_SOC_GTM601
 	tristate 'GTM601 UMTS modem audio codec'
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index a68c3d192..646e017a8 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -137,6 +137,7 @@ snd-soc-es8328-spi-y := es8328-spi.o
 snd-soc-es8375-y := es8375.o
 snd-soc-es8389-y := es8389.o
 snd-soc-framer-y := framer-codec.o
+snd-soc-fs-amp-lib-y := fs-amp-lib.o
 snd-soc-gtm601-y := gtm601.o
 snd-soc-hdac-hdmi-y := hdac_hdmi.o
 snd-soc-hdac-hda-y := hdac_hda.o
@@ -562,6 +563,7 @@ obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o
 obj-$(CONFIG_SND_SOC_ES8375)    += snd-soc-es8375.o
 obj-$(CONFIG_SND_SOC_ES8389)    += snd-soc-es8389.o
 obj-$(CONFIG_SND_SOC_FRAMER)	+= snd-soc-framer.o
+obj-$(CONFIG_SND_SOC_FS_AMP_LIB)+= snd-soc-fs-amp-lib.o
 obj-$(CONFIG_SND_SOC_GTM601)    += snd-soc-gtm601.o
 obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
 obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o
diff --git a/sound/soc/codecs/fs-amp-lib.c b/sound/soc/codecs/fs-amp-lib.c
new file mode 100644
index 000000000..75d8d5082
--- /dev/null
+++ b/sound/soc/codecs/fs-amp-lib.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// fs-amp-lib.c --- Common library for FourSemi Audio Amplifiers
+//
+// Copyright (C) 2016-2025 Shanghai FourSemi Semiconductor Co.,Ltd.
+
+#include <linux/crc16.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "fs-amp-lib.h"
+
+static int fs_get_scene_count(struct fs_amp_lib *amp_lib)
+{
+	const struct fs_fwm_table *table;
+	int count;
+
+	if (!amp_lib || !amp_lib->dev)
+		return -EINVAL;
+
+	table = amp_lib->table[FS_INDEX_SCENE];
+	if (!table)
+		return -EFAULT;
+
+	count = table->size / sizeof(struct fs_scene_index);
+	if (count < 1 || count > FS_SCENE_COUNT_MAX) {
+		dev_err(amp_lib->dev, "Invalid scene count: %d\n", count);
+		return -ERANGE;
+	}
+
+	return count;
+}
+
+static void fs_get_fwm_string(struct fs_amp_lib *amp_lib,
+			      int offset, const char **pstr)
+{
+	const struct fs_fwm_table *table;
+
+	if (!amp_lib || !amp_lib->dev || !pstr)
+		return;
+
+	table = amp_lib->table[FS_INDEX_STRING];
+	if (table && offset > 0 && offset < table->size + sizeof(*table))
+		*pstr = (char *)table + offset;
+	else
+		*pstr = NULL;
+}
+
+static void fs_get_scene_reg(struct fs_amp_lib *amp_lib,
+			     int offset, struct fs_amp_scene *scene)
+{
+	const struct fs_fwm_table *table;
+
+	if (!amp_lib || !amp_lib->dev || !scene)
+		return;
+
+	table = amp_lib->table[FS_INDEX_REG];
+	if (table && offset > 0 && offset < table->size + sizeof(*table))
+		scene->reg = (struct fs_reg_table *)((char *)table + offset);
+	else
+		scene->reg = NULL;
+}
+
+static void fs_get_scene_model(struct fs_amp_lib *amp_lib,
+			       int offset, struct fs_amp_scene *scene)
+{
+	const struct fs_fwm_table *table;
+	const char *ptr;
+
+	if (!amp_lib || !amp_lib->dev || !scene)
+		return;
+
+	table = amp_lib->table[FS_INDEX_MODEL];
+	ptr = (char *)table;
+	if (table && offset > 0 && offset < table->size + sizeof(*table))
+		scene->model = (struct fs_file_table *)(ptr + offset);
+	else
+		scene->model = NULL;
+}
+
+static void fs_get_scene_effect(struct fs_amp_lib *amp_lib,
+				int offset, struct fs_amp_scene *scene)
+{
+	const struct fs_fwm_table *table;
+	const char *ptr;
+
+	if (!amp_lib || !amp_lib->dev || !scene)
+		return;
+
+	table = amp_lib->table[FS_INDEX_EFFECT];
+	ptr = (char *)table;
+	if (table && offset > 0 && offset < table->size + sizeof(*table))
+		scene->effect = (struct fs_file_table *)(ptr + offset);
+	else
+		scene->effect = NULL;
+}
+
+static int fs_parse_scene_tables(struct fs_amp_lib *amp_lib)
+{
+	const struct fs_scene_index *scene_index;
+	const struct fs_fwm_table *table;
+	struct fs_amp_scene *scene;
+	int idx, count;
+
+	if (!amp_lib || !amp_lib->dev)
+		return -EINVAL;
+
+	count = fs_get_scene_count(amp_lib);
+	if (count <= 0)
+		return -EFAULT;
+
+	scene = devm_kzalloc(amp_lib->dev, count * sizeof(*scene), GFP_KERNEL);
+	if (!scene)
+		return -ENOMEM;
+
+	amp_lib->scene_count = count;
+	amp_lib->scene = scene;
+
+	table = amp_lib->table[FS_INDEX_SCENE];
+	scene_index = (struct fs_scene_index *)table->buf;
+
+	for (idx = 0; idx < count; idx++) {
+		fs_get_fwm_string(amp_lib, scene_index->name, &scene->name);
+		if (!scene->name)
+			scene->name = devm_kasprintf(amp_lib->dev,
+						     GFP_KERNEL, "S%d", idx);
+		dev_dbg(amp_lib->dev, "scene.%d name: %s\n", idx, scene->name);
+		fs_get_scene_reg(amp_lib, scene_index->reg, scene);
+		fs_get_scene_model(amp_lib, scene_index->model, scene);
+		fs_get_scene_effect(amp_lib, scene_index->effect, scene);
+		scene++;
+		scene_index++;
+	}
+
+	return 0;
+}
+
+static int fs_parse_all_tables(struct fs_amp_lib *amp_lib)
+{
+	const struct fs_fwm_table *table;
+	const struct fs_fwm_index *index;
+	const char *ptr;
+	int idx, count;
+	int ret;
+
+	if (!amp_lib || !amp_lib->dev || !amp_lib->hdr)
+		return -EINVAL;
+
+	/* Parse all fwm tables */
+	table = (struct fs_fwm_table *)amp_lib->hdr->params;
+	index = (struct fs_fwm_index *)table->buf;
+	count = table->size / sizeof(*index);
+
+	for (idx = 0; idx < count; idx++, index++) {
+		if (index->type >= FS_INDEX_MAX)
+			return -ERANGE;
+		ptr = (char *)table + (int)index->offset;
+		amp_lib->table[index->type] = (struct fs_fwm_table *)ptr;
+	}
+
+	/* Parse all scene tables */
+	ret = fs_parse_scene_tables(amp_lib);
+	if (ret)
+		dev_err(amp_lib->dev, "Failed to parse scene: %d\n", ret);
+
+	return ret;
+}
+
+static int fs_verify_firmware(struct fs_amp_lib *amp_lib)
+{
+	const struct fs_fwm_header *hdr;
+	int crcsum;
+
+	if (!amp_lib || !amp_lib->dev || !amp_lib->hdr)
+		return -EINVAL;
+
+	hdr = amp_lib->hdr;
+
+	/* Verify the crcsum code */
+	crcsum = crc16(0x0000, (const char *)&hdr->crc_size, hdr->crc_size);
+	if (crcsum != hdr->crc16) {
+		dev_err(amp_lib->dev, "Failed to checksum: %x-%x\n",
+			crcsum, hdr->crc16);
+		return -EFAULT;
+	}
+
+	/* Verify the devid(chip_type) */
+	if (amp_lib->devid != LO_U16(hdr->chip_type)) {
+		dev_err(amp_lib->dev, "DEVID dismatch: %04X#%04X\n",
+			amp_lib->devid, hdr->chip_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void fs_print_firmware_info(struct fs_amp_lib *amp_lib)
+{
+	const struct fs_fwm_header *hdr;
+	const char *pro_name = NULL;
+	const char *dev_name = NULL;
+
+	if (!amp_lib || !amp_lib->dev || !amp_lib->hdr)
+		return;
+
+	hdr = amp_lib->hdr;
+
+	fs_get_fwm_string(amp_lib, hdr->project, &pro_name);
+	fs_get_fwm_string(amp_lib, hdr->device, &dev_name);
+
+	dev_info(amp_lib->dev, "Project: %s Device: %s\n",
+		 pro_name ? pro_name : "null",
+		 dev_name ? dev_name : "null");
+
+	dev_info(amp_lib->dev, "Date: %04d%02d%02d-%02d%02d\n",
+		 hdr->date.year, hdr->date.month, hdr->date.day,
+		 hdr->date.hour, hdr->date.minute);
+}
+
+int fs_amp_load_firmware(struct fs_amp_lib *amp_lib, const char *name)
+{
+	const struct firmware *cont;
+	struct fs_fwm_header *hdr;
+	int ret;
+
+	if (!amp_lib || !amp_lib->dev || !name)
+		return -EINVAL;
+
+	ret = request_firmware(&cont, name, amp_lib->dev);
+	if (ret) {
+		dev_err(amp_lib->dev, "Failed to request %s: %d\n", name, ret);
+		return ret;
+	}
+
+	dev_info(amp_lib->dev, "Loading %s - size: %zu\n", name, cont->size);
+
+	hdr = devm_kmemdup(amp_lib->dev, cont->data, cont->size, GFP_KERNEL);
+	release_firmware(cont);
+	if (!hdr)
+		return -ENOMEM;
+
+	amp_lib->hdr = hdr;
+	ret = fs_verify_firmware(amp_lib);
+	if (ret) {
+		amp_lib->hdr = NULL;
+		return ret;
+	}
+
+	ret = fs_parse_all_tables(amp_lib);
+	if (ret) {
+		amp_lib->hdr = NULL;
+		return ret;
+	}
+
+	fs_print_firmware_info(amp_lib);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fs_amp_load_firmware);
+
+MODULE_AUTHOR("Nick Li <nick.li@foursemi.com>");
+MODULE_DESCRIPTION("FourSemi audio amplifier library");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/fs-amp-lib.h b/sound/soc/codecs/fs-amp-lib.h
new file mode 100644
index 000000000..4a77c7b38
--- /dev/null
+++ b/sound/soc/codecs/fs-amp-lib.h
@@ -0,0 +1,150 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * fs-amp-lib.h --- Common library for FourSemi Audio Amplifiers
+ *
+ * Copyright (C) 2016-2025 Shanghai FourSemi Semiconductor Co.,Ltd.
+ */
+
+#ifndef __FS_AMP_LIB_H__
+#define __FS_AMP_LIB_H__
+
+#define HI_U16(a)		(((a) >> 8) & 0xFF)
+#define LO_U16(a)		((a) & 0xFF)
+#define FS_TABLE_NAME_LEN	(4)
+#define FS_SCENE_COUNT_MAX	(16)
+#define FS_CMD_DELAY_MS_MAX	(100) /* 100ms */
+
+#define FS_CMD_DELAY		(0xFF)
+#define FS_CMD_BURST		(0xFE)
+#define FS_CMD_UPDATE		(0xFD)
+
+#define FS_SOC_ENUM_EXT(xname, xhandler_info, xhandler_get, xhandler_put) \
+{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+	.info = xhandler_info, \
+	.get = xhandler_get, .put = xhandler_put \
+}
+
+enum fs_index_type {
+	FS_INDEX_INFO = 0,
+	FS_INDEX_STCOEF,
+	FS_INDEX_SCENE,
+	FS_INDEX_MODEL,
+	FS_INDEX_REG,
+	FS_INDEX_EFFECT,
+	FS_INDEX_STRING,
+	FS_INDEX_WOOFER,
+	FS_INDEX_MAX,
+};
+
+#pragma pack(push, 1)
+
+struct fs_reg_val {
+	u8 reg;
+	u16 val;
+};
+
+struct fs_reg_bits {
+	u8 cmd; /* FS_CMD_UPDATE */
+	u8 reg;
+	u16 val;
+	u16 mask;
+};
+
+struct fs_cmd_pkg {
+	union {
+		u8 cmd;
+		struct fs_reg_val regv;
+		struct fs_reg_bits regb;
+	};
+};
+
+struct fs_fwm_index {
+	/* Index type */
+	u16 type;
+	/* Offset address starting from the end of header */
+	u16 offset;
+};
+
+struct fs_fwm_table {
+	char name[FS_TABLE_NAME_LEN];
+	u16 size; /* size of buf */
+	u8 buf[];
+};
+
+struct fs_scene_index {
+	/* Offset address(scene name) in string table */
+	u16 name;
+	/* Offset address(scene reg) in register table */
+	u16 reg;
+	/* Offset address(scene model) in model table */
+	u16 model;
+	/* Offset address(scene effect) in effect table */
+	u16 effect;
+};
+
+struct fs_reg_table {
+	u16 size; /* size of buf */
+	u8 buf[];
+};
+
+struct fs_file_table {
+	u16 name;
+	u16 size; /* size of buf */
+	u8 buf[];
+};
+
+struct fs_fwm_date {
+	u32 year:12;
+	u32 month:4;
+	u32 day:5;
+	u32 hour:5;
+	u32 minute:6;
+};
+
+struct fs_fwm_header {
+	u16 version;
+	u16 project; /* Offset address(project name) in string table */
+	u16 device; /* Offset address(device name) in string table */
+	struct fs_fwm_date date;
+	u16 crc16;
+	u16 crc_size; /* Starting position for CRC checking */
+	u16 chip_type;
+	u16 addr; /* 7-bit i2c address */
+	u16 spkid;
+	u16 rsvd[6];
+	u8 params[];
+};
+
+#pragma pack(pop)
+
+struct fs_i2s_srate {
+	u32 srate; /* Sample rate */
+	u16 i2ssr; /* Value of Bit field[I2SSR] */
+};
+
+struct fs_pll_div {
+	unsigned int bclk; /* Rate of bit clock */
+	u16 pll1;
+	u16 pll2;
+	u16 pll3;
+};
+
+struct fs_amp_scene {
+	const char *name;
+	const struct fs_reg_table  *reg;
+	const struct fs_file_table *model;
+	const struct fs_file_table *effect;
+};
+
+struct fs_amp_lib {
+	const struct fs_fwm_header *hdr;
+	const struct fs_fwm_table *table[FS_INDEX_MAX];
+	struct fs_amp_scene *scene;
+	struct device *dev;
+	int scene_count;
+	u16 devid;
+};
+
+int fs_amp_load_firmware(struct fs_amp_lib *amp_lib, const char *name);
+
+#endif // __FS_AMP_LIB_H__
-- 
2.50.1

[PATCH v6 4/5] ASoC: codecs: Add FourSemi FS2104/5S audio amplifier driver

[Nick Li]

The FS2104/5S are FourSemi digital audio amplifiers
with I2C control. They are Inductor-Less, Stereo, Closed-Loop,
Digital Input Class-D Power Amplifiers with Enhanced Signal Processing.

Signed-off-by: Nick Li <nick.li@foursemi.com>
---
 sound/soc/codecs/Kconfig  |   13 +
 sound/soc/codecs/Makefile |    2 +
 sound/soc/codecs/fs210x.c | 1583 +++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/fs210x.h |   75 ++
 4 files changed, 1673 insertions(+)
 create mode 100644 sound/soc/codecs/fs210x.c
 create mode 100644 sound/soc/codecs/fs210x.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index ecdc05ef3..787cc23e8 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -125,6 +125,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_ES7134
 	imply SND_SOC_ES7241
 	imply SND_SOC_FRAMER
+	imply SND_SOC_FS210X
 	imply SND_SOC_GTM601
 	imply SND_SOC_HDAC_HDMI
 	imply SND_SOC_HDAC_HDA
@@ -1236,6 +1237,18 @@ config SND_SOC_FS_AMP_LIB
 	select CRC16
 	tristate
 
+config SND_SOC_FS210X
+	tristate 'FourSemi FS2104/5S digital audio amplifier'
+	depends on I2C
+	select GPIOLIB
+	select REGMAP_I2C
+	select SND_SOC_FS_AMP_LIB
+	help
+	  Enable support for FourSemi FS2104/5S digital audio amplifier.
+	  The FS2104/5S are Inductor-Less, Stereo, Closed-Loop,
+	  Digital Input Class-D Power Amplifiers with Enhanced Signal Processing.
+	  The amplifiers support I2C and I2S/TDM.
+
 config SND_SOC_GTM601
 	tristate 'GTM601 UMTS modem audio codec'
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 646e017a8..3f97afaaa 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -138,6 +138,7 @@ snd-soc-es8375-y := es8375.o
 snd-soc-es8389-y := es8389.o
 snd-soc-framer-y := framer-codec.o
 snd-soc-fs-amp-lib-y := fs-amp-lib.o
+snd-soc-fs210x-y := fs210x.o
 snd-soc-gtm601-y := gtm601.o
 snd-soc-hdac-hdmi-y := hdac_hdmi.o
 snd-soc-hdac-hda-y := hdac_hda.o
@@ -564,6 +565,7 @@ obj-$(CONFIG_SND_SOC_ES8375)    += snd-soc-es8375.o
 obj-$(CONFIG_SND_SOC_ES8389)    += snd-soc-es8389.o
 obj-$(CONFIG_SND_SOC_FRAMER)	+= snd-soc-framer.o
 obj-$(CONFIG_SND_SOC_FS_AMP_LIB)+= snd-soc-fs-amp-lib.o
+obj-$(CONFIG_SND_SOC_FS210X)	+= snd-soc-fs210x.o
 obj-$(CONFIG_SND_SOC_GTM601)    += snd-soc-gtm601.o
 obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
 obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o
diff --git a/sound/soc/codecs/fs210x.c b/sound/soc/codecs/fs210x.c
new file mode 100644
index 000000000..b4f51ee72
--- /dev/null
+++ b/sound/soc/codecs/fs210x.c
@@ -0,0 +1,1583 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// fs210x.c -- Driver for the FS2104/5S Audio Amplifier
+//
+// Copyright (C) 2016-2025 Shanghai FourSemi Semiconductor Co.,Ltd.
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include "fs210x.h"
+#include "fs-amp-lib.h"
+
+#define FS210X_DEFAULT_FWM_NAME		"fs210x_fwm.bin"
+#define FS210X_DEFAULT_DAI_NAME		"fs210x-aif"
+#define FS2105S_DEVICE_ID		0x20 /* FS2105S */
+#define FS210X_DEVICE_ID		0x45 /* FS2104 */
+#define FS210X_REG_MAX			0xF8
+#define FS210X_INIT_SCENE		0
+#define FS210X_DEFAULT_SCENE		1
+#define FS210X_START_DELAY_MS		5
+#define FS210X_FAULT_CHECK_INTERVAL_MS	2000
+#define FS2105S_RATES			(SNDRV_PCM_RATE_32000 | \
+					 SNDRV_PCM_RATE_44100 | \
+					 SNDRV_PCM_RATE_48000 | \
+					 SNDRV_PCM_RATE_88200 | \
+					 SNDRV_PCM_RATE_96000)
+#define FS210X_RATES			(SNDRV_PCM_RATE_16000 | FS2105S_RATES)
+#define FS210X_FORMATS			(SNDRV_PCM_FMTBIT_S16_LE | \
+					 SNDRV_PCM_FMTBIT_S24_LE | \
+					 SNDRV_PCM_FMTBIT_S24_3LE | \
+					 SNDRV_PCM_FMTBIT_S32_LE)
+#define FS210X_NUM_SUPPLIES		ARRAY_SIZE(fs210x_supply_names)
+
+static const char *const fs210x_supply_names[] = {
+	"pvdd",
+	"dvdd",
+};
+
+struct fs210x_platform_data {
+	const char *fwm_name;
+};
+
+struct fs210x_priv {
+	struct i2c_client *i2c;
+	struct device *dev;
+	struct regmap *regmap;
+	struct fs210x_platform_data pdata;
+	struct regulator_bulk_data supplies[FS210X_NUM_SUPPLIES];
+	struct gpio_desc *gpio_sdz;
+	struct delayed_work start_work;
+	struct delayed_work fault_check_work;
+	struct fs_amp_lib amp_lib;
+	const struct fs_amp_scene *cur_scene;
+	struct clk *clk_bclk;
+	/*
+	 * @lock: Mutex ensuring exclusive access for critical device operations
+	 *
+	 * This lock serializes access between the following actions:
+	 *  - Device initialization procedures(probe)
+	 *  - Enable/disable device(DAPM event)
+	 *  - Suspend/resume device(PM)
+	 *  - Runtime scene switching(control)
+	 *  - Scheduling/execution of delayed works items(delayed works)
+	 */
+	struct mutex lock;
+	unsigned int check_interval_ms;
+	unsigned int bclk;
+	unsigned int srate;
+	int scene_id;
+	u16 devid;
+	bool is_inited;
+	bool is_suspended;
+	bool is_bclk_on;
+	bool is_playing;
+};
+
+static const unsigned int fs2105s_rates[] = {
+	32000, 44100, 48000, 88200, 96000
+};
+
+static const struct snd_pcm_hw_constraint_list fs2105s_constraints = {
+	.count = ARRAY_SIZE(fs2105s_rates),
+	.list  = fs2105s_rates,
+};
+
+static const unsigned int fs210x_rates[] = {
+	16000, 32000, 44100, 48000, 88200, 96000
+};
+
+static const struct snd_pcm_hw_constraint_list fs210x_constraints = {
+	.count = ARRAY_SIZE(fs210x_rates),
+	.list  = fs210x_rates,
+};
+
+static const struct fs_pll_div fs210x_pll_div[] = {
+	/*    bclk,   pll1,   pll2,   pll3 */
+	{   512000, 0x006C, 0x0120, 0x0001 },
+	{   768000, 0x016C, 0x00C0, 0x0001 },
+	{  1024000, 0x016C, 0x0090, 0x0001 },
+	{  1536000, 0x016C, 0x0060, 0x0001 },
+	{  2048000, 0x016C, 0x0090, 0x0002 },
+	{  2304000, 0x016C, 0x0080, 0x0002 },
+	{  3072000, 0x016C, 0x0090, 0x0003 },
+	{  4096000, 0x016C, 0x0090, 0x0004 },
+	{  4608000, 0x016C, 0x0080, 0x0004 },
+	{  6144000, 0x016C, 0x0090, 0x0006 },
+	{  8192000, 0x016C, 0x0090, 0x0008 },
+	{  9216000, 0x016C, 0x0090, 0x0009 },
+	{ 12288000, 0x016C, 0x0090, 0x000C },
+	{ 16384000, 0x016C, 0x0090, 0x0010 },
+	{ 18432000, 0x016C, 0x0090, 0x0012 },
+	{ 24576000, 0x016C, 0x0090, 0x0018 },
+	{  1411200, 0x016C, 0x0060, 0x0001 },
+	{  2116800, 0x016C, 0x0080, 0x0002 },
+	{  2822400, 0x016C, 0x0090, 0x0003 },
+	{  4233600, 0x016C, 0x0080, 0x0004 },
+	{  5644800, 0x016C, 0x0090, 0x0006 },
+	{  8467200, 0x016C, 0x0090, 0x0009 },
+	{ 11289600, 0x016C, 0x0090, 0x000C },
+	{ 16934400, 0x016C, 0x0090, 0x0012 },
+	{ 22579200, 0x016C, 0x0090, 0x0018 },
+	{  2000000, 0x017C, 0x0093, 0x0002 },
+};
+
+static int fs210x_bclk_set(struct fs210x_priv *fs210x, bool on)
+{
+	int ret = 0;
+
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	if ((fs210x->is_bclk_on ^ on) == 0)
+		return 0;
+
+	if (on) {
+		clk_set_rate(fs210x->clk_bclk, fs210x->bclk);
+		ret = clk_prepare_enable(fs210x->clk_bclk);
+		fs210x->is_bclk_on = true;
+		fsleep(2000); /* >= 2ms */
+	} else {
+		clk_disable_unprepare(fs210x->clk_bclk);
+		fs210x->is_bclk_on = false;
+	}
+
+	return ret;
+}
+
+static int fs210x_reg_write(struct fs210x_priv *fs210x,
+			    u8 reg, u16 val)
+{
+	int ret;
+
+	ret = regmap_write(fs210x->regmap, reg, val);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to write %02Xh: %d\n", reg, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fs210x_reg_read(struct fs210x_priv *fs210x,
+			   u8 reg, u16 *pval)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(fs210x->regmap, reg, &val);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to read %02Xh: %d\n", reg, ret);
+		return ret;
+	}
+
+	*pval = (u16)val;
+
+	return 0;
+}
+
+static int fs210x_reg_update_bits(struct fs210x_priv *fs210x,
+				  u8 reg, u16 mask, u16 val)
+{
+	int ret;
+
+	ret = regmap_update_bits(fs210x->regmap, reg, mask, val);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to update %02Xh: %d\n", reg, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fs210x_reg_bulk_write(struct fs210x_priv *fs210x,
+				 u8 reg, const void *val, u32 size)
+{
+	int ret;
+
+	ret = regmap_bulk_write(fs210x->regmap, reg, val, size / 2);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to bulk write %02Xh: %d\n",
+			reg, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static inline int fs210x_write_reg_val(struct fs210x_priv *fs210x,
+				       const struct fs_reg_val *regv)
+{
+	return fs210x_reg_write(fs210x, regv->reg, regv->val);
+}
+
+static inline int fs210x_write_reg_bits(struct fs210x_priv *fs210x,
+					const struct fs_reg_bits *regu)
+{
+	return fs210x_reg_update_bits(fs210x,
+				      regu->reg,
+				      regu->mask,
+				      regu->val);
+}
+
+static inline int fs210x_set_cmd_pkg(struct fs210x_priv *fs210x,
+				     const struct fs_cmd_pkg *pkg,
+				     unsigned int *offset)
+{
+	int delay_us;
+
+	if (pkg->cmd >= 0x00 && pkg->cmd <= FS210X_REG_MAX) {
+		*offset = sizeof(pkg->regv);
+		return fs210x_write_reg_val(fs210x, &pkg->regv);
+	} else if (pkg->cmd == FS_CMD_UPDATE) {
+		*offset = sizeof(pkg->regb);
+		return fs210x_write_reg_bits(fs210x, &pkg->regb);
+	} else if (pkg->cmd == FS_CMD_DELAY) {
+		if (pkg->regv.val > FS_CMD_DELAY_MS_MAX)
+			return -EOPNOTSUPP;
+		delay_us = pkg->regv.val * 1000; /* ms -> us */
+		fsleep(delay_us);
+		*offset = sizeof(pkg->regv);
+		return 0;
+	}
+
+	dev_err(fs210x->dev, "Invalid pkg cmd: %d\n", pkg->cmd);
+
+	return -EOPNOTSUPP;
+}
+
+static int fs210x_reg_write_table(struct fs210x_priv *fs210x,
+				  const struct fs_reg_table *reg)
+{
+	const struct fs_cmd_pkg *pkg;
+	unsigned int index, offset;
+	int ret;
+
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	if (!reg || reg->size == 0)
+		return -EFAULT;
+
+	for (index = 0; index < reg->size; index += offset) {
+		pkg = (struct fs_cmd_pkg *)(reg->buf + index);
+		ret = fs210x_set_cmd_pkg(fs210x, pkg, &offset);
+		if (ret) {
+			dev_err(fs210x->dev, "Failed to set cmd pkg: %02X-%d\n",
+				pkg->cmd, ret);
+			return ret;
+		}
+	}
+
+	if (index != reg->size) {
+		dev_err(fs210x->dev, "Invalid reg table size: %d-%d\n",
+			index, reg->size);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int fs210x_dev_play(struct fs210x_priv *fs210x)
+{
+	int ret;
+
+	if (!fs210x->is_inited)
+		return -EFAULT;
+
+	if (fs210x->is_playing)
+		return 0;
+
+	ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
+			       FS210X_11H_DPS_PLAY);
+	if (!ret)
+		fs210x->is_playing = true;
+
+	fsleep(10000); /* >= 10ms */
+
+	return ret;
+}
+
+static int fs210x_dev_stop(struct fs210x_priv *fs210x)
+{
+	int ret;
+
+	if (!fs210x->is_inited)
+		return -EFAULT;
+
+	if (!fs210x->is_playing)
+		return 0;
+
+	ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
+			       FS210X_11H_DPS_PWDN);
+	fs210x->is_playing = false;
+
+	fsleep(30000); /* >= 30ms */
+
+	return ret;
+}
+
+static int fs210x_set_reg_table(struct fs210x_priv *fs210x,
+				const struct fs_amp_scene *scene)
+{
+	const struct fs_amp_scene *cur_scene;
+	const struct fs_reg_table *reg;
+
+	if (!fs210x || !fs210x->dev || !scene)
+		return -EINVAL;
+
+	cur_scene = fs210x->cur_scene;
+	if (!scene->reg || cur_scene == scene) {
+		dev_dbg(fs210x->dev, "Skip writing reg table\n");
+		return 0;
+	}
+
+	reg = scene->reg;
+	dev_dbg(fs210x->dev, "reg table size: %d\n", reg->size);
+
+	return fs210x_reg_write_table(fs210x, reg);
+}
+
+static int fs210x_set_woofer_table(struct fs210x_priv *fs210x)
+{
+	const struct fs_file_table *woofer;
+	const struct fs_fwm_table *table;
+	int ret;
+
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	/* NOTE: fs2105s has woofer ram only */
+	if (fs210x->devid != FS2105S_DEVICE_ID)
+		return 0;
+
+	table = fs210x->amp_lib.table[FS_INDEX_WOOFER];
+	if (!table) {
+		dev_dbg(fs210x->dev, "Skip writing woofer table\n");
+		return 0;
+	}
+
+	woofer = (struct fs_file_table *)table->buf;
+	dev_dbg(fs210x->dev, "woofer table size: %d\n", woofer->size);
+	/* Unit of woofer data is u32(4 bytes) */
+	if (woofer->size == 0 || (woofer->size & 0x3)) {
+		dev_err(fs210x->dev, "Invalid woofer size: %d\n",
+			woofer->size);
+		return -EINVAL;
+	}
+
+	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
+			       FS2105S_46H_CAM_BURST_W);
+	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
+				     woofer->buf, woofer->size);
+
+	return ret;
+}
+
+static int fs210x_set_effect_table(struct fs210x_priv *fs210x,
+				   const struct fs_amp_scene *scene)
+{
+	const struct fs_amp_scene *cur_scene;
+	const struct fs_file_table *effect;
+	int half_size;
+	int ret;
+
+	if (!fs210x || !fs210x->dev || !scene)
+		return -EINVAL;
+
+	cur_scene = fs210x->cur_scene;
+	if (!scene->effect || cur_scene == scene) {
+		dev_dbg(fs210x->dev, "Skip writing effect table\n");
+		return 0;
+	}
+
+	effect = scene->effect;
+	dev_dbg(fs210x->dev, "effect table size: %d\n", effect->size);
+
+	/* Unit of effect data is u32(4 bytes), 2 channels */
+	if (effect->size == 0 || (effect->size & 0x7)) {
+		dev_err(fs210x->dev, "Invalid effect size: %d\n",
+			effect->size);
+		return -EINVAL;
+	}
+
+	half_size = effect->size / 2;
+
+	/* Left channel */
+	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
+			       FS210X_46H_CAM_BURST_L);
+	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
+				     effect->buf, half_size);
+	if (ret)
+		return ret;
+
+	/* Right channel */
+	ret = fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
+			       FS210X_46H_CAM_BURST_R);
+	ret |= fs210x_reg_bulk_write(fs210x, FS210X_42H_DACEQWL,
+				     effect->buf + half_size, half_size);
+
+	return ret;
+}
+
+static int fs210x_access_dsp_ram(struct fs210x_priv *fs210x, bool enable)
+{
+	int ret;
+
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	if (enable) {
+		ret = fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
+				       FS210X_11H_DPS_HIZ);
+		ret |= fs210x_reg_write(fs210x, FS210X_0BH_ACCKEY,
+					FS210X_0BH_ACCKEY_ON);
+	} else {
+		ret = fs210x_reg_write(fs210x, FS210X_0BH_ACCKEY,
+				       FS210X_0BH_ACCKEY_OFF);
+		ret |= fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
+					FS210X_11H_DPS_PWDN);
+	}
+
+	fsleep(10000); /* >= 10ms */
+
+	return ret;
+}
+
+static int fs210x_write_dsp_effect(struct fs210x_priv *fs210x,
+				   const struct fs_amp_scene *scene,
+				   int scene_id)
+{
+	int ret;
+
+	if (!fs210x || !scene)
+		return -EINVAL;
+
+	ret = fs210x_access_dsp_ram(fs210x, true);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to access dsp: %d\n", ret);
+		goto tag_exit;
+	}
+
+	ret = fs210x_set_effect_table(fs210x, scene);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to set effect: %d\n", ret);
+		goto tag_exit;
+	}
+
+	if (scene_id == FS210X_INIT_SCENE)
+		ret = fs210x_set_woofer_table(fs210x);
+
+tag_exit:
+	fs210x_reg_write(fs210x, FS210X_46H_DACEQA,
+			 FS210X_46H_CAM_CLEAR);
+	fs210x_access_dsp_ram(fs210x, false);
+
+	return ret;
+}
+
+static int fs210x_check_scene(struct fs210x_priv *fs210x,
+			      int scene_id, bool *skip_set)
+{
+	struct fs_amp_lib *amp_lib;
+
+	if (!fs210x || !skip_set)
+		return -EINVAL;
+
+	amp_lib = &fs210x->amp_lib;
+	if (amp_lib->scene_count == 0 || !amp_lib->scene) {
+		dev_err(fs210x->dev, "There's no scene data\n");
+		return -EINVAL;
+	}
+
+	if (scene_id < 0 || scene_id >= amp_lib->scene_count) {
+		dev_err(fs210x->dev, "Invalid scene_id: %d\n", scene_id);
+		return -EINVAL;
+	}
+
+	if (fs210x->scene_id == scene_id) {
+		dev_dbg(fs210x->dev, "Skip to set same scene\n");
+		return 0;
+	}
+
+	*skip_set = false;
+
+	return 0;
+}
+
+static int fs210x_set_scene(struct fs210x_priv *fs210x, int scene_id)
+{
+	const struct fs_amp_scene *scene;
+	bool skip_set = true;
+	bool is_playing;
+	int ret;
+
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	ret = fs210x_check_scene(fs210x, scene_id, &skip_set);
+	if (ret || skip_set)
+		return ret;
+
+	scene = fs210x->amp_lib.scene + scene_id;
+	dev_info(fs210x->dev, "Switch scene.%d: %s\n",
+		 scene_id, scene->name);
+
+	is_playing = fs210x->is_playing;
+	if (is_playing)
+		fs210x_dev_stop(fs210x);
+
+	ret = fs210x_set_reg_table(fs210x, scene);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to set reg: %d\n", ret);
+		return ret;
+	}
+
+	ret = fs210x_write_dsp_effect(fs210x, scene, scene_id);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to write ram: %d\n", ret);
+		return ret;
+	}
+
+	fs210x->cur_scene = scene;
+	fs210x->scene_id  = scene_id;
+
+	if (is_playing)
+		fs210x_dev_play(fs210x);
+
+	return 0;
+}
+
+static int fs210x_init_chip(struct fs210x_priv *fs210x)
+{
+	int scene_id;
+	int ret;
+
+	regcache_cache_bypass(fs210x->regmap, true);
+
+	if (!fs210x->gpio_sdz) {
+		/* Gpio is not found, i2c reset */
+		ret = fs210x_reg_write(fs210x, FS210X_10H_PWRCTRL,
+				       FS210X_10H_I2C_RESET);
+		if (ret)
+			goto tag_power_down;
+	} else {
+		/* gpio reset, deactivate */
+		gpiod_set_value_cansleep(fs210x->gpio_sdz, 0);
+	}
+
+	fsleep(10000); /* >= 10ms */
+
+	/* Backup scene id */
+	scene_id = fs210x->scene_id;
+	fs210x->scene_id = -1;
+
+	/* Init registers/RAM by init scene */
+	ret = fs210x_set_scene(fs210x, FS210X_INIT_SCENE);
+	if (ret)
+		goto tag_power_down;
+
+	/*
+	 * If the firmware has effect scene(s),
+	 * we load effect scene by default scene or scene_id
+	 */
+	if (fs210x->amp_lib.scene_count > 1) {
+		if (scene_id < FS210X_DEFAULT_SCENE)
+			scene_id = FS210X_DEFAULT_SCENE;
+		ret = fs210x_set_scene(fs210x, scene_id);
+		if (ret)
+			goto tag_power_down;
+	}
+
+tag_power_down:
+	/* Power down the device */
+	ret |= fs210x_reg_write(fs210x, FS210X_11H_SYSCTRL,
+				FS210X_11H_DPS_PWDN);
+	fsleep(10000); /* >= 10ms */
+
+	regcache_cache_bypass(fs210x->regmap, false);
+	if (!ret) {
+		regcache_mark_dirty(fs210x->regmap);
+		regcache_sync(fs210x->regmap);
+		fs210x->is_inited = true;
+	}
+
+	return ret;
+}
+
+static int fs210x_set_i2s_params(struct fs210x_priv *fs210x)
+{
+	const struct fs_i2s_srate params[] = {
+		{ 16000, 0x3 },
+		{ 32000, 0x7 },
+		{ 44100, 0x8 },
+		{ 48000, 0x9 },
+		{ 88200, 0xA },
+		{ 96000, 0xB },
+	};
+	u16 val;
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(params); i++) {
+		if (params[i].srate != fs210x->srate)
+			continue;
+		val = params[i].i2ssr << FS210X_17H_I2SSR_SHIFT;
+		ret = fs210x_reg_update_bits(fs210x,
+					     FS210X_17H_I2SCTRL,
+					     FS210X_17H_I2SSR_MASK,
+					     val);
+		return ret;
+	}
+
+	dev_err(fs210x->dev, "Invalid sample rate: %d\n", fs210x->srate);
+
+	return -EINVAL;
+}
+
+static int fs210x_get_pll_div(struct fs210x_priv *fs210x,
+			      const struct fs_pll_div **pll_div)
+{
+	int i;
+
+	if (!fs210x || !pll_div)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(fs210x_pll_div); i++) {
+		if (fs210x_pll_div[i].bclk != fs210x->bclk)
+			continue;
+		*pll_div = fs210x_pll_div + i;
+		return 0;
+	}
+
+	dev_err(fs210x->dev, "No PLL table for bclk: %d\n", fs210x->bclk);
+
+	return -EFAULT;
+}
+
+static int fs210x_set_hw_params(struct fs210x_priv *fs210x)
+{
+	const struct fs_pll_div *pll_div;
+	int ret;
+
+	ret = fs210x_set_i2s_params(fs210x);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to set i2s params: %d\n", ret);
+		return ret;
+	}
+
+	/* Set pll params */
+	ret = fs210x_get_pll_div(fs210x, &pll_div);
+	if (ret)
+		return ret;
+
+	ret  = fs210x_reg_write(fs210x, FS210X_A1H_PLLCTRL1, pll_div->pll1);
+	ret |= fs210x_reg_write(fs210x, FS210X_A2H_PLLCTRL2, pll_div->pll2);
+	ret |= fs210x_reg_write(fs210x, FS210X_A3H_PLLCTRL3, pll_div->pll3);
+
+	return ret;
+}
+
+static int fs210x_dai_startup(struct snd_pcm_substream *substream,
+			      struct snd_soc_dai *dai)
+{
+	const struct snd_pcm_hw_constraint_list *list;
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = snd_soc_component_get_drvdata(dai->component);
+	if (!fs210x) {
+		pr_err("dai_startup: fs210x is null\n");
+		return -EINVAL;
+	}
+
+	if (!substream->runtime)
+		return 0;
+
+	ret = snd_pcm_hw_constraint_mask64(substream->runtime,
+					   SNDRV_PCM_HW_PARAM_FORMAT,
+					   FS210X_FORMATS);
+	if (ret < 0) {
+		dev_err(fs210x->dev,
+			"Failed to set hw param format: %d\n", ret);
+		return ret;
+	}
+
+	if (fs210x->devid == FS2105S_DEVICE_ID)
+		list = &fs2105s_constraints;
+	else
+		list = &fs210x_constraints;
+
+	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 list);
+	if (ret < 0) {
+		dev_err(fs210x->dev,
+			"Failed to set hw param rate: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fs210x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	struct fs210x_priv *fs210x;
+
+	fs210x = snd_soc_component_get_drvdata(dai->component);
+
+	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
+	case SND_SOC_DAIFMT_CBC_CFC:
+		/* Only supports consumer mode */
+		break;
+	default:
+		dev_err(fs210x->dev, "Only supports consumer mode\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int fs210x_dai_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *dai)
+{
+	struct fs210x_priv *fs210x;
+	int chn_num;
+	int ret;
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return 0;
+
+	fs210x = snd_soc_component_get_drvdata(dai->component);
+
+	fs210x->srate = params_rate(params);
+	fs210x->bclk  = snd_soc_params_to_bclk(params);
+	chn_num = params_channels(params);
+	if (chn_num == 1) /* mono */
+		fs210x->bclk *= 2; /* I2S bus has 2 channels */
+
+	/* The FS2105S can't support 16kHz sample rate. */
+	if (fs210x->devid == FS2105S_DEVICE_ID && fs210x->srate == 16000)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&fs210x->lock);
+	ret = fs210x_set_hw_params(fs210x);
+	mutex_unlock(&fs210x->lock);
+	if (ret)
+		dev_err(fs210x->dev, "Failed to set hw params: %d\n", ret);
+
+	return ret;
+}
+
+static int fs210x_dai_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct fs210x_priv *fs210x;
+	unsigned long delay;
+
+	if (stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return 0;
+
+	fs210x = snd_soc_component_get_drvdata(dai->component);
+
+	mutex_lock(&fs210x->lock);
+
+	if (!fs210x->is_inited || fs210x->is_suspended) {
+		mutex_unlock(&fs210x->lock);
+		return 0;
+	}
+
+	mutex_unlock(&fs210x->lock);
+
+	if (mute) {
+		cancel_delayed_work_sync(&fs210x->fault_check_work);
+		cancel_delayed_work_sync(&fs210x->start_work);
+	} else {
+		delay = msecs_to_jiffies(fs210x->check_interval_ms);
+		schedule_delayed_work(&fs210x->fault_check_work, delay);
+	}
+
+	return 0;
+}
+
+static int fs210x_dai_trigger(struct snd_pcm_substream *substream,
+			      int cmd, struct snd_soc_dai *dai)
+{
+	struct fs210x_priv *fs210x;
+
+	fs210x = snd_soc_component_get_drvdata(dai->component);
+
+	mutex_lock(&fs210x->lock);
+
+	if (!fs210x->is_inited || fs210x->is_suspended || fs210x->is_playing) {
+		mutex_unlock(&fs210x->lock);
+		return 0;
+	}
+
+	mutex_unlock(&fs210x->lock);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		/*
+		 * According to the power up/down sequence of FS210x,
+		 * it requests the I2S clock has been present
+		 * and stable(>= 2ms) before playing.
+		 */
+		schedule_delayed_work(&fs210x->start_work,
+				      msecs_to_jiffies(FS210X_START_DELAY_MS));
+		break;
+
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static void fs210x_start_work(struct work_struct *work)
+{
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = container_of(work, struct fs210x_priv, start_work.work);
+
+	mutex_lock(&fs210x->lock);
+
+	ret = fs210x_dev_play(fs210x);
+	if (ret)
+		dev_err(fs210x->dev, "Failed to start playing: %d\n", ret);
+
+	mutex_unlock(&fs210x->lock);
+}
+
+static void fs210x_fault_check_work(struct work_struct *work)
+{
+	struct fs210x_priv *fs210x;
+	u16 status;
+	int ret;
+
+	fs210x = container_of(work, struct fs210x_priv, fault_check_work.work);
+
+	mutex_lock(&fs210x->lock);
+
+	if (!fs210x->is_inited || fs210x->is_suspended || !fs210x->is_playing) {
+		mutex_unlock(&fs210x->lock);
+		return;
+	}
+
+	ret = fs210x_reg_read(fs210x, FS210X_05H_ANASTAT, &status);
+	mutex_unlock(&fs210x->lock);
+	if (ret)
+		return;
+
+	if (!(status & FS210X_05H_PVDD_MASK))
+		dev_err(fs210x->dev, "PVDD fault\n");
+	if (status & FS210X_05H_OCDL_MASK)
+		dev_err(fs210x->dev, "OC detected\n");
+	if (status & FS210X_05H_UVDL_MASK)
+		dev_err(fs210x->dev, "UV detected\n");
+	if (status & FS210X_05H_OVDL_MASK)
+		dev_err(fs210x->dev, "OV detected\n");
+	if (status & FS210X_05H_OTPDL_MASK)
+		dev_err(fs210x->dev, "OT detected\n");
+	if (status & FS210X_05H_OCRDL_MASK)
+		dev_err(fs210x->dev, "OCR detected\n");
+	if (status & FS210X_05H_OCLDL_MASK)
+		dev_err(fs210x->dev, "OCL detected\n");
+	if (status & FS210X_05H_DCRDL_MASK)
+		dev_err(fs210x->dev, "DCR detected\n");
+	if (status & FS210X_05H_DCLDL_MASK)
+		dev_err(fs210x->dev, "DCL detected\n");
+	if (status & FS210X_05H_SRDL_MASK)
+		dev_err(fs210x->dev, "SR detected\n");
+	if (status & FS210X_05H_OTWDL_MASK)
+		dev_err(fs210x->dev, "OTW detected\n");
+	if (!(status & FS210X_05H_AMPS_MASK))
+		dev_dbg(fs210x->dev, "Amplifier unready\n");
+	if (!(status & FS210X_05H_PLLS_MASK))
+		dev_err(fs210x->dev, "PLL unlock\n");
+	if (!(status & FS210X_05H_ANAS_MASK))
+		dev_err(fs210x->dev, "Analog power fault\n");
+
+	schedule_delayed_work(&fs210x->fault_check_work,
+			      msecs_to_jiffies(fs210x->check_interval_ms));
+}
+
+static int fs210x_get_drvdata_from_kctrl(struct snd_kcontrol *kctrl,
+					 struct fs210x_priv **fs210x)
+{
+	struct snd_soc_component *cmpnt;
+
+	if (!kctrl) {
+		pr_err("fs210x: kcontrol is null\n");
+		return -EINVAL;
+	}
+
+	cmpnt = snd_soc_kcontrol_component(kctrl);
+	if (!cmpnt) {
+		pr_err("fs210x: component is null\n");
+		return -EINVAL;
+	}
+
+	*fs210x = snd_soc_component_get_drvdata(cmpnt);
+
+	return 0;
+}
+
+static int fs210x_effect_scene_info(struct snd_kcontrol *kcontrol,
+				    struct snd_ctl_elem_info *uinfo)
+{
+	const struct fs_amp_scene *scene;
+	struct fs210x_priv *fs210x;
+	const char *name = "N/A";
+	int idx, count;
+	int ret;
+
+	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
+	if (ret || !fs210x->dev) {
+		pr_err("scene_effect_info: fs210x is null\n");
+		return -EINVAL;
+	}
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+
+	count = fs210x->amp_lib.scene_count - 1; /* Skip init scene */
+	if (count < 1) {
+		uinfo->value.enumerated.items = 0;
+		return 0;
+	}
+
+	uinfo->value.enumerated.items = count;
+	if (uinfo->value.enumerated.item >= count)
+		uinfo->value.enumerated.item = count - 1;
+
+	idx = uinfo->value.enumerated.item;
+	scene = fs210x->amp_lib.scene + idx + 1;
+	if (scene->name)
+		name = scene->name;
+
+	strscpy(uinfo->value.enumerated.name, name, strlen(name) + 1);
+
+	return 0;
+}
+
+static int fs210x_effect_scene_get(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct fs210x_priv *fs210x;
+	int index;
+	int ret;
+
+	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
+	if (ret || !fs210x->dev) {
+		pr_err("scene_effect_get: fs210x is null\n");
+		return -EINVAL;
+	}
+
+	/* The id of effect scene is from 1 to N. */
+	if (fs210x->scene_id < 1)
+		return -EINVAL;
+
+	mutex_lock(&fs210x->lock);
+	/*
+	 * FS210x has scene(s) as below:
+	 * init scene: id = 0
+	 * effect scene(s): id = 1~N (optional)
+	 * effect_index = scene_id - 1
+	 */
+	index = fs210x->scene_id - 1;
+	ucontrol->value.integer.value[0] = index;
+	mutex_unlock(&fs210x->lock);
+
+	return 0;
+}
+
+static int fs210x_effect_scene_put(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct fs210x_priv *fs210x;
+	int scene_id, scene_count;
+	bool is_changed = false;
+	int ret;
+
+	ret = fs210x_get_drvdata_from_kctrl(kcontrol, &fs210x);
+	if (ret || !fs210x->dev) {
+		pr_err("scene_effect_put: fs210x is null\n");
+		return -EINVAL;
+	}
+
+	mutex_lock(&fs210x->lock);
+
+	/*
+	 * FS210x has scene(s) as below:
+	 * init scene: id = 0 (It's set in fs210x_init_chip() only)
+	 * effect scene(s): id = 1~N (optional)
+	 * scene_id = effect_index + 1.
+	 */
+	scene_id = ucontrol->value.integer.value[0] + 1;
+	scene_count = fs210x->amp_lib.scene_count - 1; /* Skip init scene */
+	if (scene_id < 1 || scene_id > scene_count) {
+		mutex_unlock(&fs210x->lock);
+		return -ERANGE;
+	}
+
+	if (scene_id != fs210x->scene_id)
+		is_changed = true;
+
+	if (fs210x->is_suspended) {
+		fs210x->scene_id = scene_id;
+		mutex_unlock(&fs210x->lock);
+		return is_changed;
+	}
+
+	ret = fs210x_set_scene(fs210x, scene_id);
+	if (ret)
+		dev_err(fs210x->dev, "Failed to set scene: %d\n", ret);
+
+	mutex_unlock(&fs210x->lock);
+
+	if (!ret && is_changed)
+		return 1;
+
+	return ret;
+}
+
+static int fs210x_playback_event(struct snd_soc_dapm_widget *w,
+				 struct snd_kcontrol *kc, int event)
+{
+	struct snd_soc_component *cmpnt = snd_soc_dapm_to_component(w->dapm);
+	struct fs210x_priv *fs210x = snd_soc_component_get_drvdata(cmpnt);
+	int ret = 0;
+
+	mutex_lock(&fs210x->lock);
+
+	if (fs210x->is_suspended) {
+		mutex_unlock(&fs210x->lock);
+		return 0;
+	}
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		/*
+		 * If there is no bclk for us to set the clock output,
+		 * we will enable the device(start_work) in dai trigger.
+		 */
+		if (!fs210x->clk_bclk)
+			break;
+		fs210x_bclk_set(fs210x, true);
+		ret = fs210x_dev_play(fs210x);
+		break;
+	case SND_SOC_DAPM_POST_PMD:
+		ret = fs210x_dev_stop(fs210x);
+		fs210x_bclk_set(fs210x, false);
+		break;
+	default:
+		break;
+	}
+
+	mutex_unlock(&fs210x->lock);
+
+	return ret;
+}
+
+static const struct snd_soc_dai_ops fs210x_dai_ops = {
+	.startup		= fs210x_dai_startup,
+	.set_fmt		= fs210x_dai_set_fmt,
+	.hw_params		= fs210x_dai_hw_params,
+	.mute_stream		= fs210x_dai_mute,
+	.trigger		= fs210x_dai_trigger,
+};
+
+static const struct snd_soc_dai_driver fs210x_dai = {
+	.name = FS210X_DEFAULT_DAI_NAME,
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = FS210X_RATES,
+		.formats = FS210X_FORMATS,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = FS210X_RATES,
+		.formats = FS210X_FORMATS,
+	},
+	.ops = &fs210x_dai_ops,
+	.symmetric_rate = 1,
+	.symmetric_sample_bits = 1,
+};
+
+static const DECLARE_TLV_DB_SCALE(fs2105s_vol_tlv, -9709, 19, 1);
+static const DECLARE_TLV_DB_SCALE(fs210x_vol_tlv, -13357, 19, 1);
+
+static const struct snd_kcontrol_new fs2105s_vol_control[] = {
+	SOC_DOUBLE_R_TLV("PCM Playback Volume",
+			 FS210X_39H_LVOLCTRL, FS210X_3AH_RVOLCTRL,
+			 7, 0x1FF, 0, fs2105s_vol_tlv),
+};
+
+static const struct snd_kcontrol_new fs210x_vol_control[] = {
+	SOC_DOUBLE_R_TLV("PCM Playback Volume",
+			 FS210X_39H_LVOLCTRL, FS210X_3AH_RVOLCTRL,
+			 6, 0x2BF, 0, fs210x_vol_tlv),
+};
+
+static const struct snd_kcontrol_new fs210x_controls[] = {
+	SOC_DOUBLE("DAC Mute Switch", FS210X_30H_DACCTRL, 4, 8, 1, 0),
+	SOC_DOUBLE("DAC Fade Switch", FS210X_30H_DACCTRL, 5, 9, 1, 0),
+};
+
+static const struct snd_kcontrol_new fs210x_scene_control[] = {
+	FS_SOC_ENUM_EXT("Effect Scene",
+			fs210x_effect_scene_info,
+			fs210x_effect_scene_get,
+			fs210x_effect_scene_put),
+};
+
+static const struct snd_soc_dapm_widget fs210x_dapm_widgets[] = {
+	SND_SOC_DAPM_AIF_IN_E("AIF IN", "Playback", 0, SND_SOC_NOPM, 0, 0,
+			      fs210x_playback_event,
+			      SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
+	SND_SOC_DAPM_AIF_OUT("AIF OUT", "Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_OUTPUT("OUTL"),
+	SND_SOC_DAPM_OUTPUT("OUTR"),
+	SND_SOC_DAPM_INPUT("SDO"),
+};
+
+static const struct snd_soc_dapm_route fs210x_dapm_routes[] = {
+	{ "OUTL", NULL, "AIF IN" },
+	{ "OUTR", NULL, "AIF IN" },
+	{ "AIF OUT", NULL, "SDO" },
+};
+
+static int fs210x_add_mixer_controls(struct fs210x_priv *fs210x,
+				     struct snd_soc_component *cmpnt)
+{
+	const struct snd_kcontrol_new *kctrl;
+	int count;
+	int ret;
+
+	if (!fs210x || !cmpnt)
+		return -EINVAL;
+
+	if (fs210x->devid == FS2105S_DEVICE_ID) {
+		kctrl = fs2105s_vol_control;
+		count = ARRAY_SIZE(fs2105s_vol_control);
+	} else {
+		kctrl = fs210x_vol_control;
+		count = ARRAY_SIZE(fs210x_vol_control);
+	}
+
+	ret = snd_soc_add_component_controls(cmpnt, kctrl, count);
+	if (ret)
+		return ret;
+
+	/*
+	 * If the firmware has no scene or only init scene,
+	 * we skip adding this mixer control.
+	 */
+	if (fs210x->amp_lib.scene_count < 2)
+		return 0;
+
+	kctrl = fs210x_scene_control;
+	count = ARRAY_SIZE(fs210x_scene_control);
+
+	return snd_soc_add_component_controls(cmpnt, kctrl, count);
+}
+
+static int fs210x_probe(struct snd_soc_component *cmpnt)
+{
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = snd_soc_component_get_drvdata(cmpnt);
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	fs210x->amp_lib.dev   = fs210x->dev;
+	fs210x->amp_lib.devid = fs210x->devid;
+
+	ret = fs_amp_load_firmware(&fs210x->amp_lib, fs210x->pdata.fwm_name);
+	if (ret)
+		return ret;
+
+	ret = fs210x_add_mixer_controls(fs210x, cmpnt);
+	if (ret)
+		return ret;
+
+	mutex_lock(&fs210x->lock);
+	ret = fs210x_init_chip(fs210x);
+	mutex_unlock(&fs210x->lock);
+
+	return ret;
+}
+
+static void fs210x_remove(struct snd_soc_component *cmpnt)
+{
+	struct fs210x_priv *fs210x;
+
+	fs210x = snd_soc_component_get_drvdata(cmpnt);
+	if (!fs210x || !fs210x->dev)
+		return;
+
+	cancel_delayed_work_sync(&fs210x->start_work);
+	cancel_delayed_work_sync(&fs210x->fault_check_work);
+}
+
+#ifdef CONFIG_PM
+static int fs210x_suspend(struct snd_soc_component *cmpnt)
+{
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = snd_soc_component_get_drvdata(cmpnt);
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	regcache_cache_only(fs210x->regmap, true);
+
+	mutex_lock(&fs210x->lock);
+	fs210x->cur_scene = NULL;
+	fs210x->is_inited = false;
+	fs210x->is_playing = false;
+	fs210x->is_suspended = true;
+
+	gpiod_set_value_cansleep(fs210x->gpio_sdz, 1); /* Active */
+	fsleep(30000); /* >= 30ms */
+	mutex_unlock(&fs210x->lock);
+
+	cancel_delayed_work_sync(&fs210x->start_work);
+	cancel_delayed_work_sync(&fs210x->fault_check_work);
+
+	ret = regulator_bulk_disable(FS210X_NUM_SUPPLIES, fs210x->supplies);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to suspend: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fs210x_resume(struct snd_soc_component *cmpnt)
+{
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = snd_soc_component_get_drvdata(cmpnt);
+	if (!fs210x || !fs210x->dev)
+		return -EINVAL;
+
+	ret = regulator_bulk_enable(FS210X_NUM_SUPPLIES, fs210x->supplies);
+	if (ret) {
+		dev_err(fs210x->dev, "Failed to enable supplies: %d\n", ret);
+		return ret;
+	}
+
+	mutex_lock(&fs210x->lock);
+
+	fs210x->is_suspended = false;
+	ret = fs210x_init_chip(fs210x);
+
+	mutex_unlock(&fs210x->lock);
+
+	return ret;
+}
+#else
+#define fs210x_suspend NULL
+#define fs210x_resume NULL
+#endif // CONFIG_PM
+
+static bool fs210x_volatile_registers(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case FS210X_00H_STATUS ... FS210X_0FH_I2CADDR:
+	case FS210X_ABH_INTSTAT:
+	case FS210X_ACH_INTSTATR:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct snd_soc_component_driver fs210x_soc_component_dev = {
+	.probe			= fs210x_probe,
+	.remove			= fs210x_remove,
+	.suspend		= fs210x_suspend,
+	.resume			= fs210x_resume,
+	.controls		= fs210x_controls,
+	.num_controls		= ARRAY_SIZE(fs210x_controls),
+	.dapm_widgets		= fs210x_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(fs210x_dapm_widgets),
+	.dapm_routes		= fs210x_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(fs210x_dapm_routes),
+};
+
+static const struct regmap_config fs210x_regmap = {
+	.reg_bits		= 8,
+	.val_bits		= 16,
+	.max_register		= FS210X_REG_MAX,
+	.val_format_endian	= REGMAP_ENDIAN_BIG,
+	.cache_type		= REGCACHE_MAPLE,
+	.volatile_reg		= fs210x_volatile_registers,
+};
+
+static int fs210x_detect_device(struct fs210x_priv *fs210x)
+{
+	u16 devid;
+	int ret;
+
+	ret = fs210x_reg_read(fs210x, FS210X_03H_DEVID, &devid);
+	if (ret)
+		return ret;
+
+	fs210x->devid = HI_U16(devid);
+
+	switch (fs210x->devid) {
+	case FS210X_DEVICE_ID:
+		dev_info(fs210x->dev, "FS2104 detected\n");
+		break;
+	case FS2105S_DEVICE_ID:
+		dev_info(fs210x->dev, "FS2105S detected\n");
+		break;
+	default:
+		dev_err(fs210x->dev, "DEVID: 0x%04X dismatch\n", devid);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int fs210x_parse_dts(struct fs210x_priv *fs210x,
+			    struct fs210x_platform_data *pdata)
+{
+	struct device_node *node = fs210x->dev->of_node;
+	int i, ret;
+
+	if (!node)
+		return 0;
+
+	ret = of_property_read_string(node, "firmware-name", &pdata->fwm_name);
+	if (ret)
+		pdata->fwm_name = FS210X_DEFAULT_FWM_NAME;
+
+	fs210x->gpio_sdz = devm_gpiod_get_optional(fs210x->dev,
+						   "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(fs210x->gpio_sdz))
+		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->gpio_sdz),
+				     "Failed to get reset-gpios\n");
+
+	for (i = 0; i < FS210X_NUM_SUPPLIES; i++)
+		fs210x->supplies[i].supply = fs210x_supply_names[i];
+
+	ret = devm_regulator_bulk_get(fs210x->dev,
+				      ARRAY_SIZE(fs210x->supplies),
+				      fs210x->supplies);
+	if (ret)
+		return dev_err_probe(fs210x->dev, ret,
+				     "Failed to get supplies\n");
+
+	return 0;
+}
+
+static void fs210x_deinit(struct fs210x_priv *fs210x)
+{
+	gpiod_set_value_cansleep(fs210x->gpio_sdz, 1); /* Active */
+	fsleep(10000); /* >= 10ms */
+
+	regulator_bulk_disable(FS210X_NUM_SUPPLIES, fs210x->supplies);
+}
+
+static int fs210x_init(struct fs210x_priv *fs210x)
+{
+	int ret;
+
+	ret = fs210x_parse_dts(fs210x, &fs210x->pdata);
+	if (ret)
+		return ret;
+
+	fs210x->clk_bclk = devm_clk_get_optional(fs210x->dev, "bclk");
+	if (IS_ERR(fs210x->clk_bclk))
+		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->clk_bclk),
+				     "Failed to get bclk\n");
+
+	ret = regulator_bulk_enable(FS210X_NUM_SUPPLIES, fs210x->supplies);
+	if (ret)
+		return dev_err_probe(fs210x->dev, ret,
+				     "Failed to enable supplies\n");
+
+	/* Make sure the SDZ pin is pulled down enough time. */
+	fsleep(10000); /* >= 10ms */
+	gpiod_set_value_cansleep(fs210x->gpio_sdz, 0); /* Deactivate */
+	fsleep(10000); /* >= 10ms */
+
+	ret = fs210x_detect_device(fs210x);
+	if (ret) {
+		fs210x_deinit(fs210x);
+		return ret;
+	}
+
+	fs210x->scene_id     = -1; /* Invalid scene */
+	fs210x->cur_scene    = NULL;
+	fs210x->is_playing   = false;
+	fs210x->is_inited    = false;
+	fs210x->is_suspended = false;
+	fs210x->check_interval_ms = FS210X_FAULT_CHECK_INTERVAL_MS;
+
+	INIT_DELAYED_WORK(&fs210x->fault_check_work, fs210x_fault_check_work);
+	INIT_DELAYED_WORK(&fs210x->start_work, fs210x_start_work);
+	mutex_init(&fs210x->lock);
+
+	return 0;
+}
+
+static int fs210x_register_snd_component(struct fs210x_priv *fs210x)
+{
+	struct snd_soc_dai_driver *dai_drv;
+	static int instance_id;
+	int ret;
+
+	dai_drv = devm_kmemdup(fs210x->dev, &fs210x_dai,
+			       sizeof(fs210x_dai), GFP_KERNEL);
+	if (!dai_drv)
+		return -ENOMEM;
+
+	dai_drv->name = devm_kasprintf(fs210x->dev,
+				       GFP_KERNEL, "%s-%d",
+				       dai_drv->name, instance_id);
+	instance_id++;
+
+	if (fs210x->devid == FS2105S_DEVICE_ID) {
+		dai_drv->playback.rates = FS2105S_RATES;
+		dai_drv->capture.rates  = FS2105S_RATES;
+	}
+
+	ret = snd_soc_register_component(fs210x->dev,
+					 &fs210x_soc_component_dev,
+					 dai_drv, 1);
+	return ret;
+}
+
+static ssize_t check_interval_ms_show(struct device *dev,
+				      struct device_attribute *devattr,
+				      char *buf)
+{
+	struct fs210x_priv *fs210x = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", fs210x->check_interval_ms);
+}
+
+static ssize_t check_interval_ms_store(struct device *dev,
+				       struct device_attribute *devattr,
+				       const char *buf,
+				       size_t count)
+{
+	struct fs210x_priv *fs210x = dev_get_drvdata(dev);
+	int ret;
+
+	ret = kstrtouint(buf, 10, &fs210x->check_interval_ms);
+	if (ret)
+		return -EINVAL;
+
+	return (ssize_t)count;
+}
+
+static DEVICE_ATTR_RW(check_interval_ms);
+
+static struct attribute *fs210x_attrs[] = {
+	&dev_attr_check_interval_ms.attr,
+	NULL,
+};
+
+static struct attribute_group fs210x_attr_group = {
+	.attrs = fs210x_attrs,
+};
+
+static int fs210x_i2c_probe(struct i2c_client *client)
+{
+	struct fs210x_priv *fs210x;
+	int ret;
+
+	fs210x = devm_kzalloc(&client->dev, sizeof(*fs210x), GFP_KERNEL);
+	if (!fs210x)
+		return -ENOMEM;
+
+	fs210x->i2c = client;
+	fs210x->dev = &client->dev;
+	i2c_set_clientdata(client, fs210x);
+
+	fs210x->regmap = devm_regmap_init_i2c(client, &fs210x_regmap);
+	if (IS_ERR(fs210x->regmap))
+		return dev_err_probe(fs210x->dev, PTR_ERR(fs210x->regmap),
+				     "Failed to get regmap\n");
+
+	ret = fs210x_init(fs210x);
+	if (ret)
+		return ret;
+
+	ret = devm_device_add_group(fs210x->dev, &fs210x_attr_group);
+	if (ret) {
+		fs210x_deinit(fs210x);
+		return dev_err_probe(fs210x->dev, ret,
+				     "Failed to create sysfs group\n");
+	}
+
+	ret = fs210x_register_snd_component(fs210x);
+	if (ret) {
+		fs210x_deinit(fs210x);
+		return dev_err_probe(fs210x->dev, ret,
+				     "Failed to register component\n");
+	}
+
+	return 0;
+}
+
+static void fs210x_i2c_remove(struct i2c_client *client)
+{
+	struct fs210x_priv *fs210x = i2c_get_clientdata(client);
+
+	snd_soc_unregister_component(fs210x->dev);
+	fs210x_deinit(fs210x);
+}
+
+static const struct i2c_device_id fs210x_i2c_id[] = {
+	{ "fs2104" },
+	{ "fs2105s" },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, fs210x_i2c_id);
+
+static const struct of_device_id fs210x_of_match[] = {
+	{ .compatible = "foursemi,fs2105s", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, fs210x_of_match);
+
+static struct i2c_driver fs210x_i2c_driver = {
+	.driver = {
+		.name = "fs210x",
+		.of_match_table = fs210x_of_match,
+	},
+	.id_table = fs210x_i2c_id,
+	.probe    = fs210x_i2c_probe,
+	.remove   = fs210x_i2c_remove,
+};
+
+module_i2c_driver(fs210x_i2c_driver);
+
+MODULE_AUTHOR("Nick Li <nick.li@foursemi.com>");
+MODULE_DESCRIPTION("FS2104/5S Audio Amplifier Driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/fs210x.h b/sound/soc/codecs/fs210x.h
new file mode 100644
index 000000000..78e176033
--- /dev/null
+++ b/sound/soc/codecs/fs210x.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * fs210x.h -- Driver for the FS2104/5S Audio Amplifier
+ *
+ * Copyright (C) 2016-2025 Shanghai FourSemi Semiconductor Co.,Ltd.
+ */
+
+#ifndef __FS210X_H__
+#define __FS210X_H__
+
+#define FS210X_00H_STATUS		0x00
+#define FS210X_03H_DEVID		0x03
+#define FS210X_05H_ANASTAT		0x05
+#define FS210X_06H_DIGSTAT		0x06
+#define FS210X_0BH_ACCKEY		0x0B
+#define FS210X_0FH_I2CADDR		0x0F
+#define FS210X_10H_PWRCTRL		0x10
+#define FS210X_11H_SYSCTRL		0x11
+#define FS210X_17H_I2SCTRL		0x17
+#define FS210X_30H_DACCTRL		0x30
+#define FS210X_39H_LVOLCTRL		0x39
+#define FS210X_3AH_RVOLCTRL		0x3A
+#define FS210X_42H_DACEQWL		0x42
+#define FS210X_46H_DACEQA		0x46
+#define FS210X_A1H_PLLCTRL1		0xA1
+#define FS210X_A2H_PLLCTRL2		0xA2
+#define FS210X_A3H_PLLCTRL3		0xA3
+#define FS210X_ABH_INTSTAT		0xAB
+#define FS210X_ACH_INTSTATR		0xAC
+
+#define FS210X_05H_PVDD_SHIFT		14
+#define FS210X_05H_PVDD_MASK		BIT(14)
+#define FS210X_05H_OCDL_SHIFT		13
+#define FS210X_05H_OCDL_MASK		BIT(13)
+#define FS210X_05H_UVDL_SHIFT		12
+#define FS210X_05H_UVDL_MASK		BIT(12)
+#define FS210X_05H_OVDL_SHIFT		11
+#define FS210X_05H_OVDL_MASK		BIT(11)
+#define FS210X_05H_OTPDL_SHIFT		10
+#define FS210X_05H_OTPDL_MASK		BIT(10)
+#define FS210X_05H_OCRDL_SHIFT		9
+#define FS210X_05H_OCRDL_MASK		BIT(9)
+#define FS210X_05H_OCLDL_SHIFT		8
+#define FS210X_05H_OCLDL_MASK		BIT(8)
+#define FS210X_05H_DCRDL_SHIFT		7
+#define FS210X_05H_DCRDL_MASK		BIT(7)
+#define FS210X_05H_DCLDL_SHIFT		6
+#define FS210X_05H_DCLDL_MASK		BIT(6)
+#define FS210X_05H_SRDL_SHIFT		5
+#define FS210X_05H_SRDL_MASK		BIT(5)
+#define FS210X_05H_OTWDL_SHIFT		4
+#define FS210X_05H_OTWDL_MASK		BIT(4)
+#define FS210X_05H_AMPS_SHIFT		3
+#define FS210X_05H_AMPS_MASK		BIT(3)
+#define FS210X_05H_PLLS_SHIFT		1
+#define FS210X_05H_PLLS_MASK		BIT(1)
+#define FS210X_05H_ANAS_SHIFT		0
+#define FS210X_05H_ANAS_MASK		BIT(0)
+#define FS210X_17H_I2SSR_SHIFT		12
+#define FS210X_17H_I2SSR_MASK		GENMASK(15, 12)
+#define FS210X_30H_RMUTE_SHIFT		8
+#define FS210X_30H_LMUTE_SHIFT		4
+
+#define FS210X_0BH_ACCKEY_ON		0x0091
+#define FS210X_0BH_ACCKEY_OFF		0x0000
+#define FS210X_10H_I2C_RESET		0x0002
+#define FS210X_11H_DPS_HIZ		0x0100
+#define FS210X_11H_DPS_PWDN		0x0000
+#define FS210X_11H_DPS_PLAY		0x0300
+#define FS210X_46H_CAM_BURST_L		0x8000
+#define FS210X_46H_CAM_BURST_R		0x8200
+#define FS2105S_46H_CAM_BURST_W		0x8400
+#define FS210X_46H_CAM_CLEAR		0x0000
+
+#endif /* __FS210X_H__ */
-- 
2.50.1

[PATCH v6 5/5] MAINTAINERS: Add entry for FourSemi audio amplifiers

[Nick Li]

Add entry for FourSemi maintainer and related files

Signed-off-by: Nick Li <nick.li@foursemi.com>
---
 MAINTAINERS | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index fe168477c..dd38bd429 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9573,6 +9573,14 @@ F:	lib/tests/memcpy_kunit.c
 K:	\bunsafe_memcpy\b
 K:	\b__NO_FORTIFY\b
 
+FOURSEMI AUDIO AMPLIFIER DRIVER
+M:	Nick Li <nick.li@foursemi.com>
+L:	linux-sound@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/sound/foursemi,fs2105s.yaml
+F:	sound/soc/codecs/fs-amp-lib.*
+F:	sound/soc/codecs/fs210x.*
+
 FPGA DFL DRIVERS
 M:	Xu Yilun <yilun.xu@intel.com>
 R:	Tom Rix <trix@redhat.com>
-- 
2.50.1

Re: [PATCH v6 1/5] dt-bindings: vendor-prefixes: Add Shanghai FourSemi Semiconductor Co.,Ltd

[Mark Brown]

On Mon, 11 Aug 2025 18:46:06 +0800, Nick Li wrote:
> Add vendor prefix for Shanghai FourSemi Semiconductor Co.,Ltd
> Link: https://en.foursemi.com/
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/5] dt-bindings: vendor-prefixes: Add Shanghai FourSemi Semiconductor Co.,Ltd
      commit: 243167e96939630b7d0d7f61be926d327e14a017
[2/5] ASoC: dt-bindings: Add FS2104/5S audio amplifiers
      commit: fd90680da7e2d92e50ad72dfd4ea601098ab3493
[3/5] ASoC: codecs: Add library for FourSemi audio amplifiers
      commit: e0bbbcaceba1cf47751f264d0dbe36206eab0ef0
[4/5] ASoC: codecs: Add FourSemi FS2104/5S audio amplifier driver
      commit: 75611770177965ae902c87c96eace07542beff07
[5/5] MAINTAINERS: Add entry for FourSemi audio amplifiers
      commit: 2291a2186305faaf8525d57849d8ba12ad63f5e7

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark