nhlt.c
// 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>
*/
#define pr_fmt(fmt) "ACPI: NHLT: " fmt
#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/minmax.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <acpi/nhlt.h>
static struct acpi_table_nhlt *acpi_gbl_nhlt;
static struct acpi_table_nhlt empty_nhlt = {
.header = {
.signature = ACPI_SIG_NHLT,
},
};
/**
* acpi_nhlt_get_gbl_table - Retrieve a pointer to the first NHLT table.
*
* If there is no NHLT in the system, acpi_gbl_nhlt will instead point to an
* empty table.
*
* Return: ACPI status code of the operation.
*/
acpi_status acpi_nhlt_get_gbl_table(void)
{
acpi_status status;
status = acpi_get_table(ACPI_SIG_NHLT, 0, (struct acpi_table_header **)(&acpi_gbl_nhlt));
if (!acpi_gbl_nhlt)
acpi_gbl_nhlt = &empty_nhlt;
return status;
}
EXPORT_SYMBOL_GPL(acpi_nhlt_get_gbl_table);
/**
* acpi_nhlt_put_gbl_table - Release the global NHLT table.
*/
void acpi_nhlt_put_gbl_table(void)
{
acpi_put_table((struct acpi_table_header *)acpi_gbl_nhlt);
}
EXPORT_SYMBOL_GPL(acpi_nhlt_put_gbl_table);
/**
* acpi_nhlt_endpoint_match - Verify if an endpoint matches criteria.
* @ep: the endpoint to check.
* @link_type: the hardware link type, e.g.: PDM or SSP.
* @dev_type: the device type.
* @dir: stream direction.
* @bus_id: the ID of virtual bus hosting the endpoint.
*
* Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
* value to ignore the parameter when matching.
*
* Return: %true if endpoint matches specified criteria or %false otherwise.
*/
bool acpi_nhlt_endpoint_match(const struct acpi_nhlt_endpoint *ep,
int link_type, int dev_type, int dir, int bus_id)
{
return ep &&
(link_type < 0 || ep->link_type == link_type) &&
(dev_type < 0 || ep->device_type == dev_type) &&
(bus_id < 0 || ep->virtual_bus_id == bus_id) &&
(dir < 0 || ep->direction == dir);
}
EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_match);
/**
* acpi_nhlt_tb_find_endpoint - Search a NHLT table for an endpoint.
* @tb: the table to search.
* @link_type: the hardware link type, e.g.: PDM or SSP.
* @dev_type: the device type.
* @dir: stream direction.
* @bus_id: the ID of virtual bus hosting the endpoint.
*
* Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
* value to ignore the parameter during the search.
*
* Return: A pointer to endpoint matching the criteria, %NULL if not found or
* an ERR_PTR() otherwise.
*/
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 *ep;
for_each_nhlt_endpoint(tb, ep)
if (acpi_nhlt_endpoint_match(ep, link_type, dev_type, dir, bus_id))
return ep;
return NULL;
}
EXPORT_SYMBOL_GPL(acpi_nhlt_tb_find_endpoint);
/**
* acpi_nhlt_find_endpoint - Search all NHLT tables for an endpoint.
* @link_type: the hardware link type, e.g.: PDM or SSP.
* @dev_type: the device type.
* @dir: stream direction.
* @bus_id: the ID of virtual bus hosting the endpoint.
*
* Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
* value to ignore the parameter during the search.
*
* Return: A pointer to endpoint matching the criteria, %NULL if not found or
* an ERR_PTR() otherwise.
*/
struct acpi_nhlt_endpoint *
acpi_nhlt_find_endpoint(int link_type, int dev_type, int dir, int bus_id)
{
/* TODO: Currently limited to table of index 0. */
return acpi_nhlt_tb_find_endpoint(acpi_gbl_nhlt, link_type, dev_type, dir, bus_id);
}
EXPORT_SYMBOL_GPL(acpi_nhlt_find_endpoint);
/**
* acpi_nhlt_endpoint_find_fmtcfg - Search endpoint's formats configuration space
* for a specific format.
* @ep: the endpoint to search.
* @ch: number of channels.
* @rate: samples per second.
* @vbps: valid bits per sample.
* @bps: bits per sample.
*
* Return: A pointer to format matching the criteria, %NULL if not found or
* an ERR_PTR() otherwise.
*/
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_wave_formatext *wav;
struct acpi_nhlt_format_config *fmt;
for_each_nhlt_endpoint_fmtcfg(ep, fmt) {
wav = &fmt->format;
if (wav->valid_bits_per_sample == vbps &&
wav->samples_per_sec == rate &&
wav->bits_per_sample == bps &&
wav->channel_count == ch)
return fmt;
}
return NULL;
}
EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_find_fmtcfg);
/**
* acpi_nhlt_tb_find_fmtcfg - Search a NHLT table for a specific format.
* @tb: the table to search.
* @link_type: the hardware link type, e.g.: PDM or SSP.
* @dev_type: the device type.
* @dir: stream direction.
* @bus_id: the ID of virtual bus hosting the endpoint.
*
* @ch: number of channels.
* @rate: samples per second.
* @vbps: valid bits per sample.
* @bps: bits per sample.
*
* Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
* value to ignore the parameter during the search.
*
* Return: A pointer to format matching the criteria, %NULL if not found or
* an ERR_PTR() otherwise.
*/
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 vbps, u16 bps)
{
struct acpi_nhlt_format_config *fmt;
struct acpi_nhlt_endpoint *ep;
for_each_nhlt_endpoint(tb, ep) {
if (!acpi_nhlt_endpoint_match(ep, link_type, dev_type, dir, bus_id))
continue;
fmt = acpi_nhlt_endpoint_find_fmtcfg(ep, ch, rate, vbps, bps);
if (fmt)
return fmt;
}
return NULL;
}
EXPORT_SYMBOL_GPL(acpi_nhlt_tb_find_fmtcfg);
/**
* acpi_nhlt_find_fmtcfg - Search all NHLT tables for a specific format.
* @link_type: the hardware link type, e.g.: PDM or SSP.
* @dev_type: the device type.
* @dir: stream direction.
* @bus_id: the ID of virtual bus hosting the endpoint.
*
* @ch: number of channels.
* @rate: samples per second.
* @vbps: valid bits per sample.
* @bps: bits per sample.
*
* Either of @link_type, @dev_type, @dir or @bus_id may be set to a negative
* value to ignore the parameter during the search.
*
* Return: A pointer to format matching the criteria, %NULL if not found or
* an ERR_PTR() otherwise.
*/
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 vbps, u16 bps)
{
/* TODO: Currently limited to table of index 0. */
return acpi_nhlt_tb_find_fmtcfg(acpi_gbl_nhlt, link_type, dev_type, dir, bus_id,
ch, rate, vbps, bps);
}
EXPORT_SYMBOL_GPL(acpi_nhlt_find_fmtcfg);
static bool acpi_nhlt_config_is_micdevice(struct acpi_nhlt_config *cfg)
{
return cfg->capabilities_size >= sizeof(struct acpi_nhlt_micdevice_config);
}
static bool acpi_nhlt_config_is_vendor_micdevice(struct acpi_nhlt_config *cfg)
{
struct acpi_nhlt_vendor_micdevice_config *devcfg = __acpi_nhlt_config_caps(cfg);
return cfg->capabilities_size >= sizeof(*devcfg) &&
cfg->capabilities_size == struct_size(devcfg, mics, devcfg->mics_count);
}
/**
* acpi_nhlt_endpoint_mic_count - Retrieve number of digital microphones for a PDM endpoint.
* @ep: the endpoint to return microphones count for.
*
* Return: A number of microphones or an error code if an invalid endpoint is provided.
*/
int acpi_nhlt_endpoint_mic_count(const struct acpi_nhlt_endpoint *ep)
{
union acpi_nhlt_device_config *devcfg;
struct acpi_nhlt_format_config *fmt;
struct acpi_nhlt_config *cfg;
u16 max_ch = 0;
if (!ep || ep->link_type != ACPI_NHLT_LINKTYPE_PDM)
return -EINVAL;
/* Find max number of channels based on formats configuration. */
for_each_nhlt_endpoint_fmtcfg(ep, fmt)
max_ch = max(fmt->format.channel_count, max_ch);
cfg = __acpi_nhlt_endpoint_config(ep);
devcfg = __acpi_nhlt_config_caps(cfg);
/* If @ep is not a mic array, fallback to channels count. */
if (!acpi_nhlt_config_is_micdevice(cfg) ||
devcfg->gen.config_type != ACPI_NHLT_CONFIGTYPE_MICARRAY)
return max_ch;
switch (devcfg->mic.array_type) {
case ACPI_NHLT_ARRAYTYPE_LINEAR2_SMALL:
case ACPI_NHLT_ARRAYTYPE_LINEAR2_BIG:
return 2;
case ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO1:
case ACPI_NHLT_ARRAYTYPE_PLANAR4_LSHAPED:
case ACPI_NHLT_ARRAYTYPE_LINEAR4_GEO2:
return 4;
case ACPI_NHLT_ARRAYTYPE_VENDOR:
if (!acpi_nhlt_config_is_vendor_micdevice(cfg))
return -EINVAL;
return devcfg->vendor_mic.mics_count;
default:
pr_warn("undefined mic array type: %#x\n", devcfg->mic.array_type);
return max_ch;
}
}
EXPORT_SYMBOL_GPL(acpi_nhlt_endpoint_mic_count);
