include/acpi/nhlt.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright(c) 2023-2024 Intel Corporation
   4  *
   5  * Authors: Cezary Rojewski <cezary.rojewski@intel.com>
   6  *          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
   7  */
   8
   9 #ifndef __ACPI_NHLT_H__
  10 #define __ACPI_NHLT_H__
  11
  12 #include <linux/acpi.h>
  13 #include <linux/kconfig.h>
  14 #include <linux/overflow.h>
  15 #include <linux/types.h>
  16
  17 #define __acpi_nhlt_endpoint_config(ep)         ((void *)((ep) + 1))
  18 #define __acpi_nhlt_config_caps(cfg)            ((void *)((cfg) + 1))
  19
  20 /**
  21  * acpi_nhlt_endpoint_fmtscfg - Get the formats configuration space.
  22  * @ep:         the endpoint to retrieve the space for.
  23  *
  24  * Return: A pointer to the formats configuration space.
  25  */
  26 static inline struct acpi_nhlt_formats_config *
  27 acpi_nhlt_endpoint_fmtscfg(const struct acpi_nhlt_endpoint *ep)
  28 {
  29         struct acpi_nhlt_config *cfg = __acpi_nhlt_endpoint_config(ep);
  30
  31         return (struct acpi_nhlt_formats_config *)((u8 *)(cfg + 1) + cfg->capabilities_size);
  32 }
  33
  34 #define __acpi_nhlt_first_endpoint(tb) \
  35         ((void *)(tb + 1))
  36
  37 #define __acpi_nhlt_next_endpoint(ep) \
  38         ((void *)((u8 *)(ep) + (ep)->length))
  39
  40 #define __acpi_nhlt_get_endpoint(tb, ep, i) \
  41         ((i) ? __acpi_nhlt_next_endpoint(ep) : __acpi_nhlt_first_endpoint(tb))
  42
  43 #define __acpi_nhlt_first_fmtcfg(fmts) \
  44         ((void *)(fmts + 1))
  45
  46 #define __acpi_nhlt_next_fmtcfg(fmt) \
  47         ((void *)((u8 *)((fmt) + 1) + (fmt)->config.capabilities_size))
  48
  49 #define __acpi_nhlt_get_fmtcfg(fmts, fmt, i) \
  50         ((i) ? __acpi_nhlt_next_fmtcfg(fmt) : __acpi_nhlt_first_fmtcfg(fmts))
  51
  52 /*
  53  * The for_each_nhlt_*() macros rely on an iterator to deal with the
  54  * variable length of each endpoint structure and the possible presence
  55  * of an OED-Config used by Windows only.
  56  */
  57
  58 /**
  59  * for_each_nhlt_endpoint - Iterate over endpoints in a NHLT table.
  60  * @tb:         the pointer to a NHLT table.
  61  * @ep:         the pointer to endpoint to use as loop cursor.
  62  */
  63 #define for_each_nhlt_endpoint(tb, ep)                                  \
  64         for (unsigned int __i = 0;                                      \
  65              __i < (tb)->endpoints_count &&                             \
  66                 (ep = __acpi_nhlt_get_endpoint(tb, ep, __i));           \
  67              __i++)
  68
  69 /**
  70  * for_each_nhlt_fmtcfg - Iterate over format configurations.
  71  * @fmts:       the pointer to formats configuration space.
  72  * @fmt:        the pointer to format to use as loop cursor.
  73  */
  74 #define for_each_nhlt_fmtcfg(fmts, fmt)                                 \
  75         for (unsigned int __i = 0;                                      \
  76              __i < (fmts)->formats_count &&                             \
  77                 (fmt = __acpi_nhlt_get_fmtcfg(fmts, fmt, __i)); \
  78              __i++)
  79
  80 /**
  81  * for_each_nhlt_endpoint_fmtcfg - Iterate over format configurations in an endpoint.
  82  * @ep:         the pointer to an endpoint.
  83  * @fmt:        the pointer to format to use as loop cursor.
  84  */
  85 #define for_each_nhlt_endpoint_fmtcfg(ep, fmt) \
  86         for_each_nhlt_fmtcfg(acpi_nhlt_endpoint_fmtscfg(ep), fmt)
  87
  88 #if IS_ENABLED(CONFIG_ACPI_NHLT)
  89
  90 /*
  91  * System-wide pointer to the first NHLT table.
  92  *
  93  * A sound driver may utilize acpi_nhlt_get/put_gbl_table() on its
  94  * initialization and removal respectively to avoid excessive mapping
  95  * and unmapping of the memory occupied by the table between streaming
  96  * operations.
  97  */
  98
  99 acpi_status acpi_nhlt_get_gbl_table(void);
 100 void acpi_nhlt_put_gbl_table(void);
 101
 102 bool acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
 103                               int link_type, int dev_type, int dir, int bus_id);
 104 struct acpi_nhlt_endpoint *
 105 acpi_nhlt_tb_find_endpoint(const struct acpi_table_nhlt *tb,
 106                            int link_type, int dev_type, int dir, int bus_id);
 107 struct acpi_nhlt_endpoint *
 108 acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id);
 109 struct acpi_nhlt_format_config *
 110 acpi_nhlt_endpoint_find_fmtcfg(const struct acpi_nhlt_endpoint *ep,
 111                                u16 ch, u32 rate, u16 vbps, u16 bps);
 112 struct acpi_nhlt_format_config *
 113 acpi_nhlt_tb_find_fmtcfg(const struct acpi_table_nhlt *tb,
 114                          int link_type, int dev_type, int dir, int bus_id,
 115                          u16 ch, u32 rate, u16 vpbs, u16 bps);
 116 struct acpi_nhlt_format_config *
 117 acpi_nhlt_find_fmtcfg(int link_type, int dev_type, int dir, int bus_id,
 118                       u16 ch, u32 rate, u16 vpbs, u16 bps);
 119 int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep);
 120
 121 #else /* !CONFIG_ACPI_NHLT */
 122
 123 static inline acpi_status acpi_nhlt_get_gbl_table(void)
 124 {
 125         return AE_NOT_FOUND;
 126 }
 127
 128 static inline void acpi_nhlt_put_gbl_table(void)
 129 {
 130 }
 131
 132 static inline bool
 133 acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
 134                          int link_type, int dev_type, int dir, int bus_id)
 135 {
 136         return false;
 137 }
 138
 139 static inline struct acpi_nhlt_endpoint *
 140 acpi_nhlt_tb_find_endpoint(const struct acpi_table_nhlt *tb,
 141                            int link_type, int dev_type, int dir, int bus_id)
 142 {
 143         return NULL;
 144 }
 145
 146 static inline struct acpi_nhlt_format_config *
 147 acpi_nhlt_endpoint_find_fmtcfg(const struct acpi_nhlt_endpoint *ep,
 148                                u16 ch, u32 rate, u16 vbps, u16 bps)
 149 {
 150         return NULL;
 151 }
 152
 153 static inline struct acpi_nhlt_format_config *
 154 acpi_nhlt_tb_find_fmtcfg(const struct acpi_table_nhlt *tb,
 155                          int link_type, int dev_type, int dir, int bus_id,
 156                          u16 ch, u32 rate, u16 vpbs, u16 bps)
 157 {
 158         return NULL;
 159 }
 160
 161 static inline int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep)
 162 {
 163         return 0;
 164 }
 165
 166 static inline struct acpi_nhlt_endpoint *
 167 acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id)
 168 {
 169         return NULL;
 170 }
 171
 172 static inline struct acpi_nhlt_format_config *
 173 acpi_nhlt_find_fmtcfg(int link_type, int dev_type, int dir, int bus_id,
 174                       u16 ch, u32 rate, u16 vpbs, u16 bps)
 175 {
 176         return NULL;
 177 }
 178
 179 #endif /* CONFIG_ACPI_NHLT */
 180
 181 #endif /* __ACPI_NHLT_H__ */