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nhlt.h
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nhlt.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright(c) 2023-2024 Intel Corporation
*
* Authors: Cezary Rojewski <[email protected]>
* Amadeusz Slawinski <[email protected]>
*/
#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__ */