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Bluetooth: audio: Add initial Hearing Access Service implementation

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This adds bare minimum implementation of Hearing Access Service.
The GATT HAS service contains one Hearing Aid Features mandatory
characteristic.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
This commit is contained in:
Mariusz Skamra 2022-03-14 14:15:32 +01:00 • committed by Carles Cufí
commit 7c99e67b94
5 changed files with 148 additions and 0 deletions
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67
subsys/bluetooth/audio/has.c Normal file
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/*
* Copyright (c) 2022 Codecoup
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <device.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/gatt.h>
#include <bluetooth/audio/audio.h>
#include <bluetooth/audio/capabilities.h>
#include "has_internal.h"
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HAS)
#define LOG_MODULE_NAME bt_has
#include "common/log.h"
static struct bt_has has;
static ssize_t read_features(struct bt_conn *conn, const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
BT_DBG("conn %p attr %p offset %d", conn, attr, offset);
if (offset > sizeof(has.features)) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
}
return bt_gatt_attr_read(conn, attr, buf, len, offset, &has.features,
sizeof(has.features));
}
/* Hearing Access Service GATT Attributes */
BT_GATT_SERVICE_DEFINE(has_svc,
BT_GATT_PRIMARY_SERVICE(BT_UUID_HAS),
BT_GATT_CHARACTERISTIC(BT_UUID_HAS_HEARING_AID_FEATURES, BT_GATT_CHRC_READ,
BT_GATT_PERM_READ_ENCRYPT, read_features, NULL, NULL),
);
static int has_init(const struct device *dev)
{
ARG_UNUSED(dev);
/* Initialize the supported features characteristic value */
has.features = CONFIG_BT_HAS_HEARING_AID_TYPE & BT_HAS_FEAT_HEARING_AID_TYPE_MASK;
if (IS_ENABLED(CONFIG_BT_HAS_HEARING_AID_BANDED)) {
/* HAP_d1.0r00; 3.7 BAP Unicast Server role requirements
* A Banded Hearing Aid in the HA role shall set the Front Left and the Front
* Right bits to a value of 0b1 in the Sink Audio Locations characteristic value.
*/
bt_audio_capability_set_location(BT_AUDIO_SINK, BT_AUDIO_LOCATION_FRONT_LEFT |
BT_AUDIO_LOCATION_FRONT_RIGHT);
} else if (IS_ENABLED(CONFIG_BT_HAS_HEARING_AID_LEFT)) {
bt_audio_capability_set_location(BT_AUDIO_SINK, BT_AUDIO_LOCATION_FRONT_LEFT);
} else {
bt_audio_capability_set_location(BT_AUDIO_SINK, BT_AUDIO_LOCATION_FRONT_RIGHT);
}
return 0;
}
SYS_INIT(has_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);