ASoC: Intel: avs: Switch to acpi-nhlt

Merge series from Cezary Rojewski <cezary.rojewski@intel.com>:

The change is based on rafael/acpi-nhlt [1] immutable branch which
Rafael kindly prepared for me. Without the topmost changes to ACPI/NHLT,
the patches present will fail to compile.

Recent changes for the ACPI tree [2] refactored interfaces of the NHLT
table. Currently we have two implementations - one found in acpi
subsystem (unused) and one in sound/hda/. As NHLT is part of ACPI, idea
is to make the former useful and then switch all users of existing
sound/hda/intel-nhlt.c to this new interface over time and remove the
duplicate afterward.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/?h=acpi-nhlt
[2]: https://lore.kernel.org/linux-acpi/20240319083018.3159716-1-cezary.rojewski@intel.com/

2 files changed, 298 insertions, 182 deletions

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 9775384d61c6..f237269bd1cb 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -1889,22 +1889,22 @@ struct nfit_device_handle {
 
 /*******************************************************************************
  *
- * NHLT - Non HD Audio Link Table
- *
- * Conforms to: Intel Smart Sound Technology NHLT Specification
- * Version 0.8.1, January 2020.
+ * NHLT - Non HDAudio Link Table
+ *        Version 1
  *
  ******************************************************************************/
 
-/* Main table */
-
 struct acpi_table_nhlt {
 	struct acpi_table_header header;	/* Common ACPI table header */
-	u8 endpoint_count;
+	u8 endpoints_count;
+	/*
+	 * struct acpi_nhlt_endpoint endpoints[];
+	 * struct acpi_nhlt_config oed_config;
+	 */
 };
 
 struct acpi_nhlt_endpoint {
-	u32 descriptor_length;
+	u32 length;
 	u8 link_type;
 	u8 instance_id;
 	u16 vendor_id;
@@ -1914,84 +1914,135 @@ struct acpi_nhlt_endpoint {
 	u8 device_type;
 	u8 direction;
 	u8 virtual_bus_id;
+	/*
+	 * struct acpi_nhlt_config device_config;
+	 * struct acpi_nhlt_formats_config formats_config;
+	 * struct acpi_nhlt_devices_info devices_info;
+	 */
 };
 
-/* Types for link_type field above */
-
-#define ACPI_NHLT_RESERVED_HD_AUDIO         0
-#define ACPI_NHLT_RESERVED_DSP              1
-#define ACPI_NHLT_PDM                       2
-#define ACPI_NHLT_SSP                       3
-#define ACPI_NHLT_RESERVED_SLIMBUS          4
-#define ACPI_NHLT_RESERVED_SOUNDWIRE        5
-#define ACPI_NHLT_TYPE_RESERVED             6	/* 6 and above are reserved */
-
-/* All other values above are reserved */
+/*
+ * Values for link_type field above
+ *
+ * Only types PDM and SSP are used
+ */
+#define ACPI_NHLT_LINKTYPE_HDA			0
+#define ACPI_NHLT_LINKTYPE_DSP			1
+#define ACPI_NHLT_LINKTYPE_PDM			2
+#define ACPI_NHLT_LINKTYPE_SSP			3
+#define ACPI_NHLT_LINKTYPE_SLIMBUS		4
+#define ACPI_NHLT_LINKTYPE_SDW			5
+#define ACPI_NHLT_LINKTYPE_UAOL			6
 
 /* Values for device_id field above */
 
-#define ACPI_NHLT_PDM_DMIC                  0xAE20
-#define ACPI_NHLT_BT_SIDEBAND               0xAE30
-#define ACPI_NHLT_I2S_TDM_CODECS            0xAE23
+#define ACPI_NHLT_DEVICEID_DMIC			0xAE20
+#define ACPI_NHLT_DEVICEID_BT			0xAE30
+#define ACPI_NHLT_DEVICEID_I2S			0xAE34
 
 /* Values for device_type field above */
 
-/* SSP Link */
-
-#define ACPI_NHLT_LINK_BT_SIDEBAND          0
-#define ACPI_NHLT_LINK_FM                   1
-#define ACPI_NHLT_LINK_MODEM                2
-/* 3 is reserved */
-#define ACPI_NHLT_LINK_SSP_ANALOG_CODEC     4
-
-/* PDM Link */
-
-#define ACPI_NHLT_PDM_ON_CAVS_1P8           0
-#define ACPI_NHLT_PDM_ON_CAVS_1P5           1
+/*
+ * Device types unique to endpoint of link_type=PDM
+ *
+ * Type PDM used for all SKL+ platforms
+ */
+#define ACPI_NHLT_DEVICETYPE_PDM		0
+#define ACPI_NHLT_DEVICETYPE_PDM_SKL		1
+/* Device types unique to endpoint of link_type=SSP */
+#define ACPI_NHLT_DEVICETYPE_BT			0
+#define ACPI_NHLT_DEVICETYPE_FM			1
+#define ACPI_NHLT_DEVICETYPE_MODEM		2
+#define ACPI_NHLT_DEVICETYPE_CODEC		4
 
 /* Values for Direction field above */
 
-#define ACPI_NHLT_DIR_RENDER                0
-#define ACPI_NHLT_DIR_CAPTURE               1
-#define ACPI_NHLT_DIR_RENDER_LOOPBACK       2
-#define ACPI_NHLT_DIR_RENDER_FEEDBACK       3
-#define ACPI_NHLT_DIR_RESERVED              4	/* 4 and above are reserved */
+#define ACPI_NHLT_DIR_RENDER			0
+#define ACPI_NHLT_DIR_CAPTURE			1
 
-struct acpi_nhlt_device_specific_config {
+struct acpi_nhlt_config {
 	u32 capabilities_size;
+	u8 capabilities[];
+};
+
+struct acpi_nhlt_gendevice_config {
 	u8 virtual_slot;
 	u8 config_type;
 };
 
-struct acpi_nhlt_device_specific_config_a {
-	u32 capabilities_size;
+/* Values for config_type field above */
+
+#define ACPI_NHLT_CONFIGTYPE_GENERIC		0
+#define ACPI_NHLT_CONFIGTYPE_MICARRAY		1
+
+struct acpi_nhlt_micdevice_config {
 	u8 virtual_slot;
 	u8 config_type;
 	u8 array_type;
 };
 
-/* Values for Config Type above */
+/* Values for array_type field above */
 
-#define ACPI_NHLT_CONFIG_TYPE_GENERIC              0x00
-#define ACPI_NHLT_CONFIG_TYPE_MIC_ARRAY            0x01
-#define ACPI_NHLT_CONFIG_TYPE_RENDER_FEEDBACK      0x03
-#define ACPI_NHLT_CONFIG_TYPE_RESERVED             0x04	/* 4 and above are reserved */
+#define ACPI_NHLT_ARRAYTYPE_LINEAR2_SMALL	0xA
+#define ACPI_NHLT_ARRAYTYPE_LINEAR2_BIG		0xB
+#define ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO1	0xC
+#define ACPI_NHLT_ARRAYTYPE_PLANAR4_LSHAPED	0xD
+#define ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO2	0xE
+#define ACPI_NHLT_ARRAYTYPE_VENDOR		0xF
 
-struct acpi_nhlt_device_specific_config_b {
-	u32 capabilities_size;
+struct acpi_nhlt_vendor_mic_config {
+	u8 type;
+	u8 panel;
+	u16 speaker_position_distance;		/* mm */
+	u16 horizontal_offset;			/* mm */
+	u16 vertical_offset;			/* mm */
+	u8 frequency_low_band;			/* 5*Hz */
+	u8 frequency_high_band;			/* 500*Hz */
+	u16 direction_angle;			/* -180 - +180 */
+	u16 elevation_angle;			/* -180 - +180 */
+	u16 work_vertical_angle_begin;		/* -180 - +180 with 2 deg step */
+	u16 work_vertical_angle_end;		/* -180 - +180 with 2 deg step */
+	u16 work_horizontal_angle_begin;	/* -180 - +180 with 2 deg step */
+	u16 work_horizontal_angle_end;		/* -180 - +180 with 2 deg step */
 };
 
-struct acpi_nhlt_device_specific_config_c {
-	u32 capabilities_size;
+/* Values for Type field above */
+
+#define ACPI_NHLT_MICTYPE_OMNIDIRECTIONAL	0
+#define ACPI_NHLT_MICTYPE_SUBCARDIOID		1
+#define ACPI_NHLT_MICTYPE_CARDIOID		2
+#define ACPI_NHLT_MICTYPE_SUPERCARDIOID		3
+#define ACPI_NHLT_MICTYPE_HYPERCARDIOID		4
+#define ACPI_NHLT_MICTYPE_8SHAPED		5
+#define ACPI_NHLT_MICTYPE_RESERVED		6
+#define ACPI_NHLT_MICTYPE_VENDORDEFINED		7
+
+/* Values for Panel field above */
+
+#define ACPI_NHLT_MICLOCATION_TOP		0
+#define ACPI_NHLT_MICLOCATION_BOTTOM		1
+#define ACPI_NHLT_MICLOCATION_LEFT		2
+#define ACPI_NHLT_MICLOCATION_RIGHT		3
+#define ACPI_NHLT_MICLOCATION_FRONT		4
+#define ACPI_NHLT_MICLOCATION_REAR		5
+
+struct acpi_nhlt_vendor_micdevice_config {
 	u8 virtual_slot;
+	u8 config_type;
+	u8 array_type;
+	u8 mics_count;
+	struct acpi_nhlt_vendor_mic_config mics[];
 };
 
-struct acpi_nhlt_render_device_specific_config {
-	u32 capabilities_size;
+union acpi_nhlt_device_config {
 	u8 virtual_slot;
+	struct acpi_nhlt_gendevice_config gen;
+	struct acpi_nhlt_micdevice_config mic;
+	struct acpi_nhlt_vendor_micdevice_config vendor_mic;
 };
 
-struct acpi_nhlt_wave_extensible {
+/* Inherited from Microsoft's WAVEFORMATEXTENSIBLE. */
+struct acpi_nhlt_wave_formatext {
 	u16 format_tag;
 	u16 channel_count;
 	u32 samples_per_sec;
@@ -2001,144 +2052,28 @@ struct acpi_nhlt_wave_extensible {
 	u16 extra_format_size;
 	u16 valid_bits_per_sample;
 	u32 channel_mask;
-	u8 sub_format_guid[16];
-};
-
-/* Values for channel_mask above */
-
-#define ACPI_NHLT_SPKR_FRONT_LEFT             0x1
-#define ACPI_NHLT_SPKR_FRONT_RIGHT            0x2
-#define ACPI_NHLT_SPKR_FRONT_CENTER           0x4
-#define ACPI_NHLT_SPKR_LOW_FREQ               0x8
-#define ACPI_NHLT_SPKR_BACK_LEFT              0x10
-#define ACPI_NHLT_SPKR_BACK_RIGHT             0x20
-#define ACPI_NHLT_SPKR_FRONT_LEFT_OF_CENTER   0x40
-#define ACPI_NHLT_SPKR_FRONT_RIGHT_OF_CENTER  0x80
-#define ACPI_NHLT_SPKR_BACK_CENTER            0x100
-#define ACPI_NHLT_SPKR_SIDE_LEFT              0x200
-#define ACPI_NHLT_SPKR_SIDE_RIGHT             0x400
-#define ACPI_NHLT_SPKR_TOP_CENTER             0x800
-#define ACPI_NHLT_SPKR_TOP_FRONT_LEFT         0x1000
-#define ACPI_NHLT_SPKR_TOP_FRONT_CENTER       0x2000
-#define ACPI_NHLT_SPKR_TOP_FRONT_RIGHT        0x4000
-#define ACPI_NHLT_SPKR_TOP_BACK_LEFT          0x8000
-#define ACPI_NHLT_SPKR_TOP_BACK_CENTER        0x10000
-#define ACPI_NHLT_SPKR_TOP_BACK_RIGHT         0x20000
+	u8 subformat[16];
+};
 
 struct acpi_nhlt_format_config {
-	struct acpi_nhlt_wave_extensible format;
-	u32 capability_size;
-	u8 capabilities[];
+	struct acpi_nhlt_wave_formatext format;
+	struct acpi_nhlt_config config;
 };
 
 struct acpi_nhlt_formats_config {
 	u8 formats_count;
+	struct acpi_nhlt_format_config formats[];
 };
 
-struct acpi_nhlt_device_specific_hdr {
-	u8 virtual_slot;
-	u8 config_type;
-};
-
-/* Types for config_type above */
-
-#define ACPI_NHLT_GENERIC                   0
-#define ACPI_NHLT_MIC                       1
-#define ACPI_NHLT_RENDER                    3
-
-struct acpi_nhlt_mic_device_specific_config {
-	struct acpi_nhlt_device_specific_hdr device_config;
-	u8 array_type_ext;
-};
-
-/* Values for array_type_ext above */
-
-#define ACPI_NHLT_ARRAY_TYPE_RESERVED               0x09	/* 9 and below are reserved */
-#define ACPI_NHLT_SMALL_LINEAR_2ELEMENT             0x0A
-#define ACPI_NHLT_BIG_LINEAR_2ELEMENT               0x0B
-#define ACPI_NHLT_FIRST_GEOMETRY_LINEAR_4ELEMENT    0x0C
-#define ACPI_NHLT_PLANAR_LSHAPED_4ELEMENT           0x0D
-#define ACPI_NHLT_SECOND_GEOMETRY_LINEAR_4ELEMENT   0x0E
-#define ACPI_NHLT_VENDOR_DEFINED                    0x0F
-#define ACPI_NHLT_ARRAY_TYPE_MASK                   0x0F
-#define ACPI_NHLT_ARRAY_TYPE_EXT_MASK               0x10
-
-#define ACPI_NHLT_NO_EXTENSION                      0x0
-#define ACPI_NHLT_MIC_SNR_SENSITIVITY_EXT           (1<<4)
-
-struct acpi_nhlt_vendor_mic_count {
-	u8 microphone_count;
-};
-
-struct acpi_nhlt_vendor_mic_config {
-	u8 type;
-	u8 panel;
-	u16 speaker_position_distance;	/* mm */
-	u16 horizontal_offset;	/* mm */
-	u16 vertical_offset;	/* mm */
-	u8 frequency_low_band;	/* 5*Hz */
-	u8 frequency_high_band;	/* 500*Hz */
-	u16 direction_angle;	/* -180 - + 180 */
-	u16 elevation_angle;	/* -180 - + 180 */
-	u16 work_vertical_angle_begin;	/* -180 - + 180 with 2 deg step */
-	u16 work_vertical_angle_end;	/* -180 - + 180 with 2 deg step */
-	u16 work_horizontal_angle_begin;	/* -180 - + 180 with 2 deg step */
-	u16 work_horizontal_angle_end;	/* -180 - + 180 with 2 deg step */
-};
-
-/* Values for Type field above */
-
-#define ACPI_NHLT_MIC_OMNIDIRECTIONAL       0
-#define ACPI_NHLT_MIC_SUBCARDIOID           1
-#define ACPI_NHLT_MIC_CARDIOID              2
-#define ACPI_NHLT_MIC_SUPER_CARDIOID        3
-#define ACPI_NHLT_MIC_HYPER_CARDIOID        4
-#define ACPI_NHLT_MIC_8_SHAPED              5
-#define ACPI_NHLT_MIC_RESERVED6             6	/* 6 is reserved */
-#define ACPI_NHLT_MIC_VENDOR_DEFINED        7
-#define ACPI_NHLT_MIC_RESERVED              8	/* 8 and above are reserved */
-
-/* Values for Panel field above */
-
-#define ACPI_NHLT_MIC_POSITION_TOP          0
-#define ACPI_NHLT_MIC_POSITION_BOTTOM       1
-#define ACPI_NHLT_MIC_POSITION_LEFT         2
-#define ACPI_NHLT_MIC_POSITION_RIGHT        3
-#define ACPI_NHLT_MIC_POSITION_FRONT        4
-#define ACPI_NHLT_MIC_POSITION_BACK         5
-#define ACPI_NHLT_MIC_POSITION_RESERVED     6	/* 6 and above are reserved */
-
-struct acpi_nhlt_vendor_mic_device_specific_config {
-	struct acpi_nhlt_mic_device_specific_config mic_array_device_config;
-	u8 number_of_microphones;
-	struct acpi_nhlt_vendor_mic_config mic_config[];	/* Indexed by number_of_microphones */
-};
-
-/* Microphone SNR and Sensitivity extension */
-
-struct acpi_nhlt_mic_snr_sensitivity_extension {
-	u32 SNR;
-	u32 sensitivity;
-};
-
-/* Render device with feedback */
-
-struct acpi_nhlt_render_feedback_device_specific_config {
-	u8 feedback_virtual_slot;	/* Render slot in case of capture */
-	u16 feedback_channels;	/* Informative only */
-	u16 feedback_valid_bits_per_sample;
-};
-
-/* Non documented structures */
-
-struct acpi_nhlt_device_info_count {
-	u8 structure_count;
+struct acpi_nhlt_device_info {
+	u8 id[16];
+	u8 instance_id;
+	u8 port_id;
 };
 
-struct acpi_nhlt_device_info {
-	u8 device_id[16];
-	u8 device_instance_id;
-	u8 device_port_id;
+struct acpi_nhlt_devices_info {
+	u8 devices_count;
+	struct acpi_nhlt_device_info devices[];
 };
 
 /*******************************************************************************
diff --git a/include/acpi/nhlt.h b/include/acpi/nhlt.h
new file mode 100644
index 000000000000..2108aa6d0207
--- /dev/null
+++ b/include/acpi/nhlt.h
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2023-2024 Intel Corporation
+ *
+ * Authors: Cezary Rojewski <cezary.rojewski@intel.com>
+ *          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
+ */
+
+#ifndef __ACPI_NHLT_H__
+#define __ACPI_NHLT_H__
+
+#include <linux/acpi.h>
+#include <linux/kconfig.h>
+#include <linux/overflow.h>
+#include <linux/types.h>
+
+#define __acpi_nhlt_endpoint_config(ep)		((void *)((ep) + 1))
+#define __acpi_nhlt_config_caps(cfg)		((void *)((cfg) + 1))
+
+/**
+ * acpi_nhlt_endpoint_fmtscfg - Get the formats configuration space.
+ * @ep:		the endpoint to retrieve the space for.
+ *
+ * Return: A pointer to the formats configuration space.
+ */
+static inline struct acpi_nhlt_formats_config *
+acpi_nhlt_endpoint_fmtscfg(const struct acpi_nhlt_endpoint *ep)
+{
+	struct acpi_nhlt_config *cfg = __acpi_nhlt_endpoint_config(ep);
+
+	return (struct acpi_nhlt_formats_config *)((u8 *)(cfg + 1) + cfg->capabilities_size);
+}
+
+#define __acpi_nhlt_first_endpoint(tb) \
+	((void *)(tb + 1))
+
+#define __acpi_nhlt_next_endpoint(ep) \
+	((void *)((u8 *)(ep) + (ep)->length))
+
+#define __acpi_nhlt_get_endpoint(tb, ep, i) \
+	((i) ? __acpi_nhlt_next_endpoint(ep) : __acpi_nhlt_first_endpoint(tb))
+
+#define __acpi_nhlt_first_fmtcfg(fmts) \
+	((void *)(fmts + 1))
+
+#define __acpi_nhlt_next_fmtcfg(fmt) \
+	((void *)((u8 *)((fmt) + 1) + (fmt)->config.capabilities_size))
+
+#define __acpi_nhlt_get_fmtcfg(fmts, fmt, i) \
+	((i) ? __acpi_nhlt_next_fmtcfg(fmt) : __acpi_nhlt_first_fmtcfg(fmts))
+
+/*
+ * The for_each_nhlt_*() macros rely on an iterator to deal with the
+ * variable length of each endpoint structure and the possible presence
+ * of an OED-Config used by Windows only.
+ */
+
+/**
+ * for_each_nhlt_endpoint - Iterate over endpoints in a NHLT table.
+ * @tb:		the pointer to a NHLT table.
+ * @ep:		the pointer to endpoint to use as loop cursor.
+ */
+#define for_each_nhlt_endpoint(tb, ep)					\
+	for (unsigned int __i = 0;					\
+	     __i < (tb)->endpoints_count &&				\
+		(ep = __acpi_nhlt_get_endpoint(tb, ep, __i));		\
+	     __i++)
+
+/**
+ * for_each_nhlt_fmtcfg - Iterate over format configurations.
+ * @fmts:	the pointer to formats configuration space.
+ * @fmt:	the pointer to format to use as loop cursor.
+ */
+#define for_each_nhlt_fmtcfg(fmts, fmt)					\
+	for (unsigned int __i = 0;					\
+	     __i < (fmts)->formats_count &&				\
+		(fmt = __acpi_nhlt_get_fmtcfg(fmts, fmt, __i));	\
+	     __i++)
+
+/**
+ * for_each_nhlt_endpoint_fmtcfg - Iterate over format configurations in an endpoint.
+ * @ep:		the pointer to an endpoint.
+ * @fmt:	the pointer to format to use as loop cursor.
+ */
+#define for_each_nhlt_endpoint_fmtcfg(ep, fmt) \
+	for_each_nhlt_fmtcfg(acpi_nhlt_endpoint_fmtscfg(ep), fmt)
+
+#if IS_ENABLED(CONFIG_ACPI_NHLT)
+
+/*
+ * System-wide pointer to the first NHLT table.
+ *
+ * A sound driver may utilize acpi_nhlt_get/put_gbl_table() on its
+ * initialization and removal respectively to avoid excessive mapping
+ * and unmapping of the memory occupied by the table between streaming
+ * operations.
+ */
+
+acpi_status acpi_nhlt_get_gbl_table(void);
+void acpi_nhlt_put_gbl_table(void);
+
+bool acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
+			      int link_type, int dev_type, int dir, int bus_id);
+struct acpi_nhlt_endpoint *
+acpi_nhlt_tb_find_endpoint(const struct acpi_table_nhlt *tb,
+			   int link_type, int dev_type, int dir, int bus_id);
+struct acpi_nhlt_endpoint *
+acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id);
+struct acpi_nhlt_format_config *
+acpi_nhlt_endpoint_find_fmtcfg(const struct acpi_nhlt_endpoint *ep,
+			       u16 ch, u32 rate, u16 vbps, u16 bps);
+struct acpi_nhlt_format_config *
+acpi_nhlt_tb_find_fmtcfg(const struct acpi_table_nhlt *tb,
+			 int link_type, int dev_type, int dir, int bus_id,
+			 u16 ch, u32 rate, u16 vpbs, u16 bps);
+struct acpi_nhlt_format_config *
+acpi_nhlt_find_fmtcfg(int link_type, int dev_type, int dir, int bus_id,
+		      u16 ch, u32 rate, u16 vpbs, u16 bps);
+int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep);
+
+#else /* !CONFIG_ACPI_NHLT */
+
+static inline acpi_status acpi_nhlt_get_gbl_table(void)
+{
+	return AE_NOT_FOUND;
+}
+
+static inline void acpi_nhlt_put_gbl_table(void)
+{
+}
+
+static inline bool
+acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
+			 int link_type, int dev_type, int dir, int bus_id)
+{
+	return false;
+}
+
+static inline struct acpi_nhlt_endpoint *
+acpi_nhlt_tb_find_endpoint(const struct acpi_table_nhlt *tb,
+			   int link_type, int dev_type, int dir, int bus_id)
+{
+	return NULL;
+}
+
+static inline struct acpi_nhlt_format_config *
+acpi_nhlt_endpoint_find_fmtcfg(const struct acpi_nhlt_endpoint *ep,
+			       u16 ch, u32 rate, u16 vbps, u16 bps)
+{
+	return NULL;
+}
+
+static inline struct acpi_nhlt_format_config *
+acpi_nhlt_tb_find_fmtcfg(const struct acpi_table_nhlt *tb,
+			 int link_type, int dev_type, int dir, int bus_id,
+			 u16 ch, u32 rate, u16 vpbs, u16 bps)
+{
+	return NULL;
+}
+
+static inline int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep)
+{
+	return 0;
+}
+
+static inline struct acpi_nhlt_endpoint *
+acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id)
+{
+	return NULL;
+}
+
+static inline struct acpi_nhlt_format_config *
+acpi_nhlt_find_fmtcfg(int link_type, int dev_type, int dir, int bus_id,
+		      u16 ch, u32 rate, u16 vpbs, u16 bps)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_ACPI_NHLT */
+
+#endif /* __ACPI_NHLT_H__ */