zephyr/subsys/bluetooth/audio/cap_commander.c

/*
 * Copyright (c) 2022-2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>

#include <zephyr/autoconf.h>
#include <zephyr/bluetooth/audio/aics.h>
#include <zephyr/bluetooth/audio/audio.h>
#include <zephyr/bluetooth/audio/bap.h>
#include <zephyr/bluetooth/audio/cap.h>
#include <zephyr/bluetooth/audio/csip.h>
#include <zephyr/bluetooth/audio/micp.h>
#include <zephyr/bluetooth/audio/vcp.h>
#include <zephyr/bluetooth/audio/vocs.h>
#include <zephyr/bluetooth/addr.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/gap.h>
#include <zephyr/bluetooth/gatt.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/sys/check.h>
#include <zephyr/sys/util.h>

#include "audio_internal.h"
#include "bap_endpoint.h"
#include "bap_internal.h"
#include "cap_internal.h"
#include "csip_internal.h"

LOG_MODULE_REGISTER(bt_cap_commander, CONFIG_BT_CAP_COMMANDER_LOG_LEVEL);

#include "common/bt_str.h"

static void cap_commander_proc_complete(void);

static const struct bt_cap_commander_cb *cap_cb;

int bt_cap_commander_register_cb(const struct bt_cap_commander_cb *cb)
{
	CHECKIF(cb == NULL) {
		LOG_DBG("cb is NULL");

		return -EINVAL;
	}

	CHECKIF(cap_cb != NULL) {
		LOG_DBG("callbacks already registered");

		return -EALREADY;
	}

	cap_cb = cb;

	return 0;
}

int bt_cap_commander_unregister_cb(const struct bt_cap_commander_cb *cb)
{
	CHECKIF(cb == NULL) {
		LOG_DBG("cb is NULL");
		return -EINVAL;
	}

	CHECKIF(cap_cb != cb) {
		LOG_DBG("cb is not registered");
		return -EINVAL;
	}

	cap_cb = NULL;

	return 0;
}

static void
cap_commander_discover_complete(struct bt_conn *conn, int err,
				const struct bt_csip_set_coordinator_set_member *member,
				const struct bt_csip_set_coordinator_csis_inst *csis_inst)
{
	if (cap_cb && cap_cb->discovery_complete) {
		cap_cb->discovery_complete(conn, err, member, csis_inst);
	}
}

int bt_cap_commander_discover(struct bt_conn *conn)
{
	CHECKIF(conn == NULL) {
		LOG_DBG("NULL conn");
		return -EINVAL;
	}

	return bt_cap_common_discover(conn, cap_commander_discover_complete);
}

#if defined(CONFIG_BT_BAP_BROADCAST_ASSISTANT)
static struct bt_bap_broadcast_assistant_cb broadcast_assistant_cb;
static bool broadcast_assistant_cb_registered;

static void
copy_broadcast_reception_start_param(struct bt_bap_broadcast_assistant_add_src_param *add_src_param,
				     struct cap_broadcast_reception_start *start_param)
{
	bt_addr_le_copy(&add_src_param->addr, &start_param->addr);
	add_src_param->adv_sid = start_param->adv_sid;
	add_src_param->broadcast_id = start_param->broadcast_id;
	add_src_param->pa_sync = true;
	add_src_param->pa_interval = start_param->pa_interval;
	add_src_param->num_subgroups = start_param->num_subgroups;
	add_src_param->subgroups = start_param->subgroups;
}

static void cap_commander_broadcast_assistant_add_src_cb(struct bt_conn *conn, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_bap_broadcast_assistant_add_src_param add_src_param = {0};

	LOG_DBG("conn %p", (void *)conn);

	if (!bt_cap_common_conn_in_active_proc(conn)) {

		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to add source: %d", err);
		LOG_DBG("Aborting the proc %d %d", active_proc->proc_done_cnt,
			active_proc->proc_initiated_cnt);

		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p broadcast source added (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		if (bt_cap_common_proc_all_handled()) {
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		copy_broadcast_reception_start_param(&add_src_param,
						     &proc_param->broadcast_reception_start);

		active_proc->proc_initiated_cnt++;
		err = bt_bap_broadcast_assistant_add_src(conn, &add_src_param);
		if (err != 0) {
			LOG_DBG("Failed to perform broadcast reception start for conn %p: %d",
				(void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

static int cap_commander_register_broadcast_assistant_cb(void)
{
	int err;

	err = bt_bap_broadcast_assistant_register_cb(&broadcast_assistant_cb);
	if (err != 0) {
		LOG_DBG("Failed to register broadcast assistant callbacks: %d", err);

		return -ENOEXEC;
	}

	broadcast_assistant_cb_registered = true;

	return 0;
}

static bool valid_broadcast_reception_start_param(
	const struct bt_cap_commander_broadcast_reception_start_param *param)
{
	uint32_t total_bis_sync = 0U;

	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %zu", param->count);
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	CHECKIF(param->param == NULL) {
		LOG_DBG("param->param is NULL");
		return false;
	}

	for (size_t i = 0; i < param->count; i++) {
		const struct bt_cap_commander_broadcast_reception_start_member_param *start_param =
			&param->param[i];
		const union bt_cap_set_member *member = &param->param[i].member;
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->param[%zu].member is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return false;
		}

		CHECKIF(start_param->addr.type > BT_ADDR_LE_RANDOM) {
			LOG_DBG("Invalid address type %u", start_param->addr.type);
			return false;
		}

		CHECKIF(start_param->adv_sid > BT_GAP_SID_MAX) {
			LOG_DBG("param->param[%zu]->adv_sid is larger than %d", i, BT_GAP_SID_MAX);
			return false;
		}

		CHECKIF(!IN_RANGE(start_param->pa_interval, BT_GAP_PER_ADV_MIN_INTERVAL,
				  BT_GAP_PER_ADV_MAX_INTERVAL)) {
			LOG_DBG("param->param[%zu]->pa_interval is out of range", i);
			return false;
		}

		CHECKIF(start_param->broadcast_id > BT_AUDIO_BROADCAST_ID_MAX) {
			LOG_DBG("param->param[%zu]->broadcast_id is larger than %u", i,
				BT_AUDIO_BROADCAST_ID_MAX);
			return false;
		}

		CHECKIF(start_param->num_subgroups == 0) {
			LOG_DBG("param->param[%zu]->num_subgroups is 0", i);
			return false;
		}

		CHECKIF(start_param->num_subgroups > CONFIG_BT_BAP_BASS_MAX_SUBGROUPS) {
			LOG_DBG("Too many subgroups %u/%u", start_param->num_subgroups,
				CONFIG_BT_BAP_BASS_MAX_SUBGROUPS);

			return false;
		}

		CHECKIF(start_param->subgroups == NULL) {
			LOG_DBG("param->param[%zu]->subgroup is NULL", i);
			return false;
		}

		total_bis_sync = 0U;
		for (size_t j = 0U; j < start_param->num_subgroups; j++) {
			const struct bt_bap_bass_subgroup *param_subgroups =
				&start_param->subgroups[j];

			CHECKIF(!valid_bis_syncs(param_subgroups->bis_sync)) {
				LOG_DBG("param->param[%zu].subgroup[%zu].bis_sync is invalid %u", i,
					j, param_subgroups->bis_sync);

				return false;
			}

			CHECKIF((total_bis_sync & param_subgroups->bis_sync) != 0) {
				LOG_DBG("param->param[%zu].subgroup[%zu].bis_sync 0x%08X has "
					"duplicate bits (0x%08X) ",
					i, j, param_subgroups->bis_sync, total_bis_sync);

				return false;
			}

			total_bis_sync |= param_subgroups->bis_sync;

			CHECKIF(param_subgroups->metadata_len >
				CONFIG_BT_AUDIO_CODEC_CFG_MAX_METADATA_SIZE) {
				LOG_DBG("param->param[%zu].subgroup[%zu].metadata_len too long "
					"%u/%u",
					i, j, param_subgroups->metadata_len,
					CONFIG_BT_AUDIO_CODEC_CFG_MAX_METADATA_SIZE);

				return false;
			}
#if defined(CONFIG_BT_AUDIO_CODEC_CFG_MAX_METADATA_SIZE)
			CHECKIF(param_subgroups->metadata_len > 0 &&
				!bt_audio_valid_ltv(param_subgroups->metadata,
						    param_subgroups->metadata_len)) {
				LOG_DBG("param->param[%zu].subgroup[%zu].metadata not valid LTV", i,
					j);
			}
#endif
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->param[j].member;

			if (other == member) {
				LOG_DBG("param->members[%zu] (%p) is duplicated by "
					"param->members[%zu] (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

int bt_cap_commander_broadcast_reception_start(
	const struct bt_cap_commander_broadcast_reception_start_param *param)
{
	struct bt_bap_broadcast_assistant_add_src_param add_src_param = {0};
	struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_broadcast_reception_start_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_BROADCAST_RECEPTION_START, param->count);

	broadcast_assistant_cb.add_src = cap_commander_broadcast_assistant_add_src_cb;
	if (!broadcast_assistant_cb_registered &&
	    cap_commander_register_broadcast_assistant_cb() != 0) {
		LOG_DBG("Failed to register broadcast assistant callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		const struct bt_cap_commander_broadcast_reception_start_member_param *member_param =
			&param->param[i];
		struct bt_cap_commander_proc_param *stored_param;
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &member_param->member);

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);

			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 * TODO: consider putting this into a function
		 */
		stored_param = &active_proc->proc_param.commander[i];
		stored_param->conn = member_conn;
		bt_addr_le_copy(&stored_param->broadcast_reception_start.addr, &member_param->addr);
		stored_param->broadcast_reception_start.adv_sid = member_param->adv_sid;
		stored_param->broadcast_reception_start.broadcast_id = member_param->broadcast_id;
		stored_param->broadcast_reception_start.pa_interval = member_param->pa_interval;
		stored_param->broadcast_reception_start.num_subgroups = member_param->num_subgroups;
		memcpy(stored_param->broadcast_reception_start.subgroups, member_param->subgroups,
		       sizeof(struct bt_bap_bass_subgroup) * member_param->num_subgroups);
	}

	active_proc->proc_initiated_cnt++;

	proc_param = &active_proc->proc_param.commander[0];

	conn = proc_param->conn;
	copy_broadcast_reception_start_param(&add_src_param,
					     &proc_param->broadcast_reception_start);

	/* TODO: what to do if we are adding a source that has already been added? */
	err = bt_bap_broadcast_assistant_add_src(conn, &add_src_param);
	if (err != 0) {
		LOG_DBG("Failed to start broadcast reception for conn %p: %d", (void *)conn, err);

		return -ENOEXEC;
	}

	return 0;
}

static void
copy_broadcast_reception_stop_param(struct bt_bap_broadcast_assistant_mod_src_param *mod_src_param,
				    struct cap_broadcast_reception_stop *stop_param)
{
	mod_src_param->src_id = stop_param->src_id;
	mod_src_param->pa_sync = false;
	mod_src_param->pa_interval = BT_BAP_PA_INTERVAL_UNKNOWN;
	mod_src_param->num_subgroups = stop_param->num_subgroups;

	mod_src_param->subgroups = stop_param->subgroups;
}

static void cap_commander_broadcast_assistant_recv_state_cb(
	struct bt_conn *conn, int err, const struct bt_bap_scan_delegator_recv_state *state)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();

	if (state == NULL) {
		/* Empty receive state, indicating that the source has been removed
		 */
		return;
	}

	if (bt_cap_common_conn_in_active_proc(conn) &&
	    active_proc->proc_type == BT_CAP_COMMON_PROC_TYPE_BROADCAST_RECEPTION_STOP) {

		LOG_DBG("BASS recv state: conn %p, src_id %u", (void *)conn, state->src_id);

		for (uint8_t i = 0; i < state->num_subgroups; i++) {
			const struct bt_bap_bass_subgroup *subgroup = &state->subgroups[i];

			/* if bis_sync not equals 0 we can not remove the source (yet)
			 * and we need to wait for another notification
			 */
			if (subgroup->bis_sync != 0) {
				return;
			}
		}

		LOG_DBG("Removing source for conn %p", (void *)conn);
		err = bt_bap_broadcast_assistant_rem_src(conn, state->src_id);
		if (err != 0) {
			LOG_DBG("Failed to rem_src for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	}
}

static void cap_commander_broadcast_assistant_rem_src_cb(struct bt_conn *conn, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_bap_broadcast_assistant_mod_src_param mod_src_param = {0};

	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed removing source: %d", err);
		LOG_DBG("Aborting the proc %d %d", active_proc->proc_done_cnt,
			active_proc->proc_initiated_cnt);

		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p broadcast source removed (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		if (bt_cap_common_proc_all_handled()) {
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		copy_broadcast_reception_stop_param(&mod_src_param,
						    &proc_param->broadcast_reception_stop);
		active_proc->proc_initiated_cnt++;
		err = bt_bap_broadcast_assistant_mod_src(conn, &mod_src_param);
		if (err != 0) {
			LOG_DBG("Failed to mod_src for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

static void cap_commander_broadcast_assistant_mod_src_cb(struct bt_conn *conn, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();

	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed modifying source: %d", err);
		LOG_DBG("Aborting the proc %d %d", active_proc->proc_done_cnt,
			active_proc->proc_initiated_cnt);

		bt_cap_common_abort_proc(conn, err);
	} else {
		LOG_DBG("Conn %p broadcast source modifified (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		if (bt_cap_common_proc_all_handled()) {
			cap_commander_proc_complete();
		}
	}
}

static bool valid_broadcast_reception_stop_param(
	const struct bt_cap_commander_broadcast_reception_stop_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %zu", param->count);
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	CHECKIF(param->param == NULL) {
		LOG_DBG("param->param is NULL");
		return false;
	}

	for (size_t i = 0; i < param->count; i++) {
		const struct bt_cap_commander_broadcast_reception_stop_member_param *stop_param =
			&param->param[i];
		const union bt_cap_set_member *member = &param->param[i].member;
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->param[%zu].member is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return false;
		}

		CHECKIF(stop_param->num_subgroups == 0) {
			LOG_DBG("param->param[%zu]->num_subgroups is 0", i);
			return false;
		}

		CHECKIF(stop_param->num_subgroups > CONFIG_BT_BAP_BASS_MAX_SUBGROUPS) {
			LOG_DBG("Too many subgroups %u/%u", stop_param->num_subgroups,
				CONFIG_BT_BAP_BASS_MAX_SUBGROUPS);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->param[j].member;
			uint8_t other_src_id = param->param[j].src_id;

			if (other == member && stop_param->src_id == other_src_id) {
				LOG_DBG("param->members[%zu], src_id %d (%p) is duplicated by "
					"param->members[%zu], src_id %d (%p)",
					j, other_src_id, other, i, stop_param->src_id, member);
				return false;
			}
		}
	}

	return true;
}

int bt_cap_commander_broadcast_reception_stop(
	const struct bt_cap_commander_broadcast_reception_stop_param *param)
{
	struct bt_bap_broadcast_assistant_mod_src_param mod_src_param = {0};
	struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_broadcast_reception_stop_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_BROADCAST_RECEPTION_STOP, param->count);

	broadcast_assistant_cb.mod_src = cap_commander_broadcast_assistant_mod_src_cb;
	broadcast_assistant_cb.rem_src = cap_commander_broadcast_assistant_rem_src_cb;
	broadcast_assistant_cb.recv_state = cap_commander_broadcast_assistant_recv_state_cb;
	if (!broadcast_assistant_cb_registered &&
	    cap_commander_register_broadcast_assistant_cb() != 0) {
		LOG_DBG("Failed to register broadcast assistant callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		const struct bt_cap_commander_broadcast_reception_stop_member_param *member_param =
			&param->param[i];
		struct bt_cap_commander_proc_param *stored_param;
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &member_param->member);

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->member[%zu]", i);

			return -EINVAL;
		}
		/* Store the necessary parameters as we cannot assume that the supplied
		 * parameters are kept valid
		 */
		stored_param = &active_proc->proc_param.commander[i];
		stored_param->conn = member_conn;
		stored_param->broadcast_reception_stop.src_id = member_param->src_id;
		stored_param->broadcast_reception_stop.num_subgroups = member_param->num_subgroups;
		for (size_t j = 0U; j < CONFIG_BT_BAP_BASS_MAX_SUBGROUPS; j++) {
			stored_param->broadcast_reception_stop.subgroups[j].bis_sync = 0;
			stored_param->broadcast_reception_stop.subgroups[j].metadata_len = 0;
		}
	}

	proc_param = &active_proc->proc_param.commander[0];

	conn = proc_param->conn;
	copy_broadcast_reception_stop_param(&mod_src_param, &proc_param->broadcast_reception_stop);

	active_proc->proc_initiated_cnt++;

	err = bt_bap_broadcast_assistant_mod_src(conn, &mod_src_param);
	if (err != 0) {
		LOG_DBG("Failed to stop broadcast reception for conn %p: %d", (void *)conn, err);

		return -ENOEXEC;
	}

	return 0;
}

static void cap_commander_broadcast_assistant_set_broadcast_code_cb(struct bt_conn *conn, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();

	LOG_DBG("conn %p", (void *)conn);

	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to distribute broadcast code: %d", err);

		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p broadcast code set (%zu/%zu done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		if (bt_cap_common_proc_all_handled()) {
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;

		active_proc->proc_initiated_cnt++;
		err = bt_bap_broadcast_assistant_set_broadcast_code(
			conn, proc_param->distribute_broadcast_code.src_id,
			proc_param->distribute_broadcast_code.broadcast_code);
		if (err != 0) {
			LOG_DBG("Failed to perform set broadcast code for conn %p: %d",
				(void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

static bool valid_distribute_broadcast_code_param(
	const struct bt_cap_commander_distribute_broadcast_code_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %zu", param->count);
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	CHECKIF(param->param == NULL) {
		LOG_DBG("param->param is NULL");
		return false;
	}

	for (size_t i = 0; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->param[i].member;
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->param[%zu].member is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->param[j].member;
			const struct bt_conn *other_conn =
				bt_cap_common_get_member_conn(param->type, other);

			if (other_conn == member_conn) {
				LOG_DBG("param->param[%zu].member.member (%p) is duplicated by "
					"param->member[%zu].member.member (%p)",
					j, (void *)other_conn, i, (void *)member_conn);
				return false;
			}
		}
	}

	return true;
}

int bt_cap_commander_distribute_broadcast_code(
	const struct bt_cap_commander_distribute_broadcast_code_param *param)
{
	struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_distribute_broadcast_code_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_DISTRIBUTE_BROADCAST_CODE, param->count);

	broadcast_assistant_cb.broadcast_code =
		cap_commander_broadcast_assistant_set_broadcast_code_cb;
	if (!broadcast_assistant_cb_registered &&
	    cap_commander_register_broadcast_assistant_cb() != 0) {
		LOG_DBG("Failed to register broadcast assistant callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		const struct bt_cap_commander_distribute_broadcast_code_member_param *member_param =
			&param->param[i];
		struct bt_cap_commander_proc_param *stored_param;
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &member_param->member);

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->member[%zu]", i);

			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the
		 * supplied parameters are kept valid
		 */
		stored_param = &active_proc->proc_param.commander[i];
		stored_param->conn = member_conn;
		stored_param->distribute_broadcast_code.src_id = member_param->src_id;
		memcpy(stored_param->distribute_broadcast_code.broadcast_code,
		       param->broadcast_code, BT_ISO_BROADCAST_CODE_SIZE);
	}

	active_proc->proc_initiated_cnt++;

	proc_param = &active_proc->proc_param.commander[0];

	conn = proc_param->conn;

	err = bt_bap_broadcast_assistant_set_broadcast_code(
		conn, proc_param->distribute_broadcast_code.src_id,
		proc_param->distribute_broadcast_code.broadcast_code);

	if (err != 0) {
		LOG_DBG("Failed to start distribute broadcast code for conn %p: %d", (void *)conn,
			err);

		return -ENOEXEC;
	}

	return 0;
}

#endif /* CONFIG_BT_BAP_BROADCAST_ASSISTANT */

static void cap_commander_proc_complete(void)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	enum bt_cap_common_proc_type proc_type;
	struct bt_conn *failed_conn;
	int err;

	failed_conn = active_proc->failed_conn;
	err = active_proc->err;
	proc_type = active_proc->proc_type;
	bt_cap_common_clear_active_proc();

	if (cap_cb == NULL) {
		return;
	}

	switch (proc_type) {
#if defined(CONFIG_BT_VCP_VOL_CTLR)
	case BT_CAP_COMMON_PROC_TYPE_VOLUME_CHANGE:
		if (cap_cb->volume_changed != NULL) {
			cap_cb->volume_changed(failed_conn, err);
		}
		break;
	case BT_CAP_COMMON_PROC_TYPE_VOLUME_MUTE_CHANGE:
		if (cap_cb->volume_mute_changed != NULL) {
			cap_cb->volume_mute_changed(failed_conn, err);
		}
		break;
#if defined(CONFIG_BT_VCP_VOL_CTLR_VOCS)
	case BT_CAP_COMMON_PROC_TYPE_VOLUME_OFFSET_CHANGE:
		if (cap_cb->volume_offset_changed != NULL) {
			cap_cb->volume_offset_changed(failed_conn, err);
		}
		break;
#endif /* CONFIG_BT_VCP_VOL_CTLR_VOCS */
#endif /* CONFIG_BT_VCP_VOL_CTLR */
#if defined(CONFIG_BT_MICP_MIC_CTLR)
	case BT_CAP_COMMON_PROC_TYPE_MICROPHONE_MUTE_CHANGE:
		if (cap_cb->microphone_mute_changed != NULL) {
			cap_cb->microphone_mute_changed(failed_conn, err);
		}
		break;
#if defined(CONFIG_BT_MICP_MIC_CTLR_AICS)
	case BT_CAP_COMMON_PROC_TYPE_MICROPHONE_GAIN_CHANGE:
		if (cap_cb->microphone_gain_changed != NULL) {
			cap_cb->microphone_gain_changed(failed_conn, err);
		}
		break;
#endif /* CONFIG_BT_MICP_MIC_CTLR_AICS */
#endif /* CONFIG_BT_MICP_MIC_CTLR */
#if defined(CONFIG_BT_BAP_BROADCAST_ASSISTANT)
	case BT_CAP_COMMON_PROC_TYPE_BROADCAST_RECEPTION_START:
		if (cap_cb->broadcast_reception_start != NULL) {
			cap_cb->broadcast_reception_start(failed_conn, err);
		}
		break;
	case BT_CAP_COMMON_PROC_TYPE_BROADCAST_RECEPTION_STOP:
		if (cap_cb->broadcast_reception_stop != NULL) {
			cap_cb->broadcast_reception_stop(failed_conn, err);
		}
		break;
	case BT_CAP_COMMON_PROC_TYPE_DISTRIBUTE_BROADCAST_CODE:
		if (cap_cb->distribute_broadcast_code != NULL) {
			cap_cb->distribute_broadcast_code(failed_conn, err);
		}
		break;
#endif /* CONFIG_BT_BAP_BROADCAST_ASSISTANT */
	case BT_CAP_COMMON_PROC_TYPE_NONE:
	default:
		__ASSERT(false, "Invalid proc_type: %u", proc_type);
	}
}

int bt_cap_commander_cancel(void)
{
	if (!bt_cap_common_proc_is_active() && !bt_cap_common_proc_is_aborted()) {
		LOG_DBG("No CAP procedure is in progress");

		return -EALREADY;
	}

	bt_cap_common_abort_proc(NULL, -ECANCELED);
	cap_commander_proc_complete();

	return 0;
}

#if defined(CONFIG_BT_VCP_VOL_CTLR)
static struct bt_vcp_vol_ctlr_cb vol_ctlr_cb;
static bool vcp_cb_registered;

static int cap_commander_register_vcp_cb(void)
{
	int err;

	err = bt_vcp_vol_ctlr_cb_register(&vol_ctlr_cb);
	if (err != 0) {
		LOG_DBG("Failed to register VCP callbacks: %d", err);

		return -ENOEXEC;
	}

	vcp_cb_registered = true;

	return 0;
}

static bool valid_change_volume_param(const struct bt_cap_commander_change_volume_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %u", param->count);
		return false;
	}

	CHECKIF(param->members == NULL) {
		LOG_DBG("param->members is NULL");
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	for (size_t i = 0U; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->members[i];
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->members[%zu] is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return false;
		}

		if (bt_vcp_vol_ctlr_get_by_conn(member_conn) == NULL) {
			LOG_DBG("Volume control not available for param->members[%zu]", i);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->members[j];

			if (other == member) {
				LOG_DBG("param->members[%zu] (%p) is duplicated by "
					"param->members[%zu] (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

static void cap_commander_vcp_vol_set_cb(struct bt_vcp_vol_ctlr *vol_ctlr, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_conn *conn;
	int vcp_err;

	LOG_DBG("vol_ctlr %p", (void *)vol_ctlr);

	vcp_err = bt_vcp_vol_ctlr_conn_get(vol_ctlr, &conn);
	if (vcp_err != 0) {
		LOG_ERR("Failed to get conn by vol_ctrl: %d", vcp_err);
		return;
	}

	LOG_DBG("conn %p", (void *)conn);
	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to set volume: %d", err);
		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p volume updated (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		LOG_DBG("Proc is aborted");
		if (bt_cap_common_proc_all_handled()) {
			LOG_DBG("All handled");
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		const struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		active_proc->proc_initiated_cnt++;
		err = bt_vcp_vol_ctlr_set_vol(bt_vcp_vol_ctlr_get_by_conn(conn),
					      proc_param->change_volume.volume);
		if (err != 0) {
			LOG_DBG("Failed to set volume for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

int bt_cap_commander_change_volume(const struct bt_cap_commander_change_volume_param *param)
{
	const struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_change_volume_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_VOLUME_CHANGE, param->count);

	vol_ctlr_cb.vol_set = cap_commander_vcp_vol_set_cb;
	if (!vcp_cb_registered && cap_commander_register_vcp_cb() != 0) {
		LOG_DBG("Failed to register VCP callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &param->members[i]);

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 */
		active_proc->proc_param.commander[i].conn = member_conn;
		active_proc->proc_param.commander[i].change_volume.volume = param->volume;
	}

	proc_param = &active_proc->proc_param.commander[0];
	conn = proc_param->conn;
	active_proc->proc_initiated_cnt++;
	err = bt_vcp_vol_ctlr_set_vol(bt_vcp_vol_ctlr_get_by_conn(conn),
				      proc_param->change_volume.volume);
	if (err != 0) {
		LOG_DBG("Failed to set volume for conn %p: %d", (void *)conn, err);
		return -ENOEXEC;
	}

	return 0;
}

static bool valid_change_volume_mute_state_param(
	const struct bt_cap_commander_change_volume_mute_state_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %u", param->count);
		return false;
	}

	CHECKIF(param->members == NULL) {
		LOG_DBG("param->members is NULL");
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	for (size_t i = 0U; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->members[i];
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->members[%zu] is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return false;
		}

		CHECKIF(bt_vcp_vol_ctlr_get_by_conn(member_conn) == NULL) {
			LOG_DBG("Volume control not available for param->members[%zu]", i);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->members[j];

			CHECKIF(other == member) {
				LOG_DBG("param->members[%zu] (%p) is duplicated by "
					"param->members[%zu] (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

static void cap_commander_vcp_vol_mute_cb(struct bt_vcp_vol_ctlr *vol_ctlr, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_conn *conn;
	int vcp_err;

	LOG_DBG("vol_ctlr %p", (void *)vol_ctlr);

	vcp_err = bt_vcp_vol_ctlr_conn_get(vol_ctlr, &conn);
	if (vcp_err != 0) {
		LOG_ERR("Failed to get conn by vol_ctrl: %d", vcp_err);
		return;
	}

	LOG_DBG("conn %p", (void *)conn);
	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to set volume: %d", err);
		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p volume updated (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		LOG_DBG("Proc is aborted");
		if (bt_cap_common_proc_all_handled()) {
			LOG_DBG("All handled");
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		const struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		active_proc->proc_initiated_cnt++;
		if (proc_param->change_vol_mute.mute) {
			err = bt_vcp_vol_ctlr_mute(bt_vcp_vol_ctlr_get_by_conn(conn));
		} else {
			err = bt_vcp_vol_ctlr_unmute(bt_vcp_vol_ctlr_get_by_conn(conn));
		}

		if (err != 0) {
			LOG_DBG("Failed to set volume for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

int bt_cap_commander_change_volume_mute_state(
	const struct bt_cap_commander_change_volume_mute_state_param *param)
{
	const struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_change_volume_mute_state_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_VOLUME_MUTE_CHANGE, param->count);

	vol_ctlr_cb.mute = cap_commander_vcp_vol_mute_cb;
	vol_ctlr_cb.unmute = cap_commander_vcp_vol_mute_cb;
	if (!vcp_cb_registered && cap_commander_register_vcp_cb() != 0) {
		LOG_DBG("Failed to register VCP callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &param->members[i]);

		CHECKIF(member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 */
		active_proc->proc_param.commander[i].conn = member_conn;
		active_proc->proc_param.commander[i].change_vol_mute.mute = param->mute;
	}

	proc_param = &active_proc->proc_param.commander[0];
	conn = proc_param->conn;
	active_proc->proc_initiated_cnt++;

	if (proc_param->change_vol_mute.mute) {
		err = bt_vcp_vol_ctlr_mute(bt_vcp_vol_ctlr_get_by_conn(conn));
	} else {
		err = bt_vcp_vol_ctlr_unmute(bt_vcp_vol_ctlr_get_by_conn(conn));
	}

	if (err != 0) {
		LOG_DBG("Failed to set volume mute state for conn %p: %d", (void *)conn, err);
		return -ENOEXEC;
	}

	return 0;
}

#if defined(CONFIG_BT_VCP_VOL_CTLR_VOCS)
static bool
valid_change_offset_param(const struct bt_cap_commander_change_volume_offset_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %u", param->count);
		return false;
	}

	CHECKIF(param->param == NULL) {
		LOG_DBG("param->param is NULL");
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	for (size_t i = 0U; i < param->count; i++) {
		const struct bt_cap_commander_change_volume_offset_member_param *member_param =
			&param->param[i];
		const union bt_cap_set_member *member = &member_param->member;
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);
		struct bt_vcp_vol_ctlr *vol_ctlr;
		struct bt_vcp_included included;
		int err;

		if (member == NULL) {
			LOG_DBG("param->param[%zu].member is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return false;
		}

		vol_ctlr = bt_vcp_vol_ctlr_get_by_conn(member_conn);
		if (vol_ctlr == NULL) {
			LOG_DBG("Volume control not available for param->param[%zu].member", i);
			return false;
		}

		err = bt_vcp_vol_ctlr_included_get(vol_ctlr, &included);
		if (err != 0 || included.vocs_cnt == 0) {
			LOG_DBG("Volume offset control not available for param->param[%zu].member",
				i);
			return -ENOEXEC;
		}

		if (!IN_RANGE(member_param->offset, BT_VOCS_MIN_OFFSET, BT_VOCS_MAX_OFFSET)) {
			LOG_DBG("Invalid offset %d for param->param[%zu].offset",
				member_param->offset, i);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->param[j].member;

			if (other == member) {
				LOG_DBG("param->param[%zu].member (%p) is duplicated by "
					"param->param[%zu].member (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

static void cap_commander_vcp_set_offset_cb(struct bt_vocs *inst, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_conn *conn;
	int vocs_err;

	LOG_DBG("bt_vocs %p", (void *)inst);

	vocs_err = bt_vocs_client_conn_get(inst, &conn);
	if (vocs_err != 0) {
		LOG_ERR("Failed to get conn by inst: %d", vocs_err);
		return;
	}

	LOG_DBG("conn %p", (void *)conn);
	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to set offset: %d", err);
		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p offset updated (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		LOG_DBG("Proc is aborted");
		if (bt_cap_common_proc_all_handled()) {
			LOG_DBG("All handled");
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		const struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		active_proc->proc_initiated_cnt++;

		err = bt_vocs_state_set(proc_param->change_offset.vocs,
					proc_param->change_offset.offset);
		if (err != 0) {
			LOG_DBG("Failed to set offset for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

int bt_cap_commander_change_volume_offset(
	const struct bt_cap_commander_change_volume_offset_param *param)
{
	const struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_vcp_vol_ctlr *vol_ctlr;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_change_offset_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_VOLUME_OFFSET_CHANGE, param->count);

	vol_ctlr_cb.vocs_cb.set_offset = cap_commander_vcp_set_offset_cb;
	if (!vcp_cb_registered && cap_commander_register_vcp_cb() != 0) {
		LOG_DBG("Failed to register VCP callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		const struct bt_cap_commander_change_volume_offset_member_param *member_param =
			&param->param[i];
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &member_param->member);
		struct bt_vcp_included included;

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return -EINVAL;
		}

		vol_ctlr = bt_vcp_vol_ctlr_get_by_conn(member_conn);
		if (vol_ctlr == NULL) {
			LOG_DBG("Invalid param->members[%zu] vol_ctlr", i);
			return -EINVAL;
		}

		err = bt_vcp_vol_ctlr_included_get(vol_ctlr, &included);
		if (err != 0 || included.vocs_cnt == 0) {
			LOG_DBG("Invalid param->members[%zu] vocs", i);
			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 */
		active_proc->proc_param.commander[i].conn = member_conn;
		active_proc->proc_param.commander[i].change_offset.offset = member_param->offset;
		/* TODO: For now we just use the first VOCS instance
		 * - How should we handle multiple?
		 */
		active_proc->proc_param.commander[i].change_offset.vocs = included.vocs[0];
	}

	proc_param = &active_proc->proc_param.commander[0];
	conn = proc_param->conn;
	active_proc->proc_initiated_cnt++;

	err = bt_vocs_state_set(proc_param->change_offset.vocs, proc_param->change_offset.offset);
	if (err != 0) {
		LOG_DBG("Failed to set volume for conn %p: %d", (void *)conn, err);
		return -ENOEXEC;
	}

	return 0;
}
#endif /* CONFIG_BT_VCP_VOL_CTLR_VOCS */
#endif /* CONFIG_BT_VCP_VOL_CTLR */

#if defined(CONFIG_BT_MICP_MIC_CTLR)
static struct bt_micp_mic_ctlr_cb mic_ctlr_cb;
static bool micp_callbacks_registered;

static int cap_commander_register_micp_callbacks(void)
{
	int err;

	err = bt_micp_mic_ctlr_cb_register(&mic_ctlr_cb);
	if (err != 0) {
		LOG_DBG("Failed to register MICP callbacks: %d", err);

		return -ENOEXEC;
	}

	micp_callbacks_registered = true;

	return 0;
}

static bool valid_change_microphone_mute_state_param(
	const struct bt_cap_commander_change_microphone_mute_state_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %u", param->count);
		return false;
	}

	CHECKIF(param->members == NULL) {
		LOG_DBG("param->members is NULL");
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	for (size_t i = 0U; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->members[i];
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);

		if (member == NULL) {
			LOG_DBG("param->members[%zu] is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return false;
		}

		CHECKIF(bt_micp_mic_ctlr_get_by_conn(member_conn) == NULL) {
			LOG_DBG("Microphone control not available for param->members[%zu]", i);
			return false;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->members[j];

			CHECKIF(other == member) {
				LOG_DBG("param->members[%zu] (%p) is duplicated by "
					"param->members[%zu] (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

static void cap_commander_micp_mic_mute_cb(struct bt_micp_mic_ctlr *mic_ctlr, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_conn *conn;
	int micp_err;

	LOG_DBG("mic_ctlr %p", (void *)mic_ctlr);

	micp_err = bt_micp_mic_ctlr_conn_get(mic_ctlr, &conn);
	if (micp_err != 0) {
		LOG_ERR("Failed to get conn by mic_ctlr: %d", micp_err);
		return;
	}

	LOG_DBG("conn %p", (void *)conn);
	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to change microphone mute: %d", err);
		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p mute updated (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		LOG_DBG("Proc is aborted");
		if (bt_cap_common_proc_all_handled()) {
			LOG_DBG("All handled");
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		const struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		active_proc->proc_initiated_cnt++;
		if (proc_param->change_mic_mute.mute) {
			err = bt_micp_mic_ctlr_mute(bt_micp_mic_ctlr_get_by_conn(conn));
		} else {
			err = bt_micp_mic_ctlr_unmute(bt_micp_mic_ctlr_get_by_conn(conn));
		}

		if (err != 0) {
			LOG_DBG("Failed to change mute for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

int bt_cap_commander_change_microphone_mute_state(
	const struct bt_cap_commander_change_microphone_mute_state_param *param)
{
	const struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_change_microphone_mute_state_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_MICROPHONE_MUTE_CHANGE, param->count);

	mic_ctlr_cb.mute_written = cap_commander_micp_mic_mute_cb;
	mic_ctlr_cb.unmute_written = cap_commander_micp_mic_mute_cb;
	if (!micp_callbacks_registered && cap_commander_register_micp_callbacks() != 0) {
		LOG_DBG("Failed to register MICP callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, &param->members[i]);

		CHECKIF(member_conn == NULL) {
			LOG_DBG("Invalid param->members[%zu]", i);
			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 */
		active_proc->proc_param.commander[i].conn = member_conn;
		active_proc->proc_param.commander[i].change_mic_mute.mute = param->mute;
	}

	proc_param = &active_proc->proc_param.commander[0];
	conn = proc_param->conn;
	active_proc->proc_initiated_cnt++;

	if (proc_param->change_mic_mute.mute) {
		err = bt_micp_mic_ctlr_mute(bt_micp_mic_ctlr_get_by_conn(conn));
	} else {
		err = bt_micp_mic_ctlr_unmute(bt_micp_mic_ctlr_get_by_conn(conn));
	}

	if (err != 0) {
		LOG_DBG("Failed to set microphone mute state for conn %p: %d", (void *)conn, err);
		return -ENOEXEC;
	}

	return 0;
}

#if defined(CONFIG_BT_MICP_MIC_CTLR_AICS)
static bool valid_change_microphone_gain_param(
	const struct bt_cap_commander_change_microphone_gain_setting_param *param)
{
	CHECKIF(param == NULL) {
		LOG_DBG("param is NULL");
		return false;
	}

	CHECKIF(param->count == 0) {
		LOG_DBG("Invalid param->count: %u", param->count);
		return false;
	}

	CHECKIF(param->param == NULL) {
		LOG_DBG("param->param is NULL");
		return false;
	}

	CHECKIF(param->count > CONFIG_BT_MAX_CONN) {
		LOG_DBG("param->count (%zu) is larger than CONFIG_BT_MAX_CONN (%d)", param->count,
			CONFIG_BT_MAX_CONN);
		return false;
	}

	for (size_t i = 0U; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->param[i].member;
		const struct bt_conn *member_conn =
			bt_cap_common_get_member_conn(param->type, member);
		struct bt_micp_mic_ctlr *mic_ctlr;
		struct bt_micp_included included;
		int err;

		if (member == NULL) {
			LOG_DBG("param->param[%zu].member is NULL", i);
			return false;
		}

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return false;
		}

		mic_ctlr = bt_micp_mic_ctlr_get_by_conn(member_conn);
		if (mic_ctlr == NULL) {
			LOG_DBG("Microphone control not available for param->param[%zu].member", i);
			return false;
		}

		err = bt_micp_mic_ctlr_included_get(mic_ctlr, &included);
		if (err != 0 || included.aics_cnt == 0) {
			LOG_DBG("Microphone audio input control not available for "
				"param->param[%zu].member",
				i);
			return -ENOEXEC;
		}

		for (size_t j = 0U; j < i; j++) {
			const union bt_cap_set_member *other = &param->param[j].member;

			if (other == member) {
				LOG_DBG("param->param[%zu].member (%p) is duplicated by "
					"param->param[%zu].member (%p)",
					j, other, i, member);
				return false;
			}
		}
	}

	return true;
}

static void cap_commander_micp_gain_set_cb(struct bt_aics *inst, int err)
{
	struct bt_cap_common_proc *active_proc = bt_cap_common_get_active_proc();
	struct bt_conn *conn;
	int micp_err;

	LOG_DBG("bt_aics %p", (void *)inst);

	micp_err = bt_aics_client_conn_get(inst, &conn);
	if (micp_err != 0) {
		LOG_ERR("Failed to get conn by aics: %d", micp_err);
		return;
	}

	LOG_DBG("conn %p", (void *)conn);
	if (!bt_cap_common_conn_in_active_proc(conn)) {
		/* State change happened outside of a procedure; ignore */
		return;
	}

	if (err != 0) {
		LOG_DBG("Failed to set gain: %d", err);
		bt_cap_common_abort_proc(conn, err);
	} else {
		active_proc->proc_done_cnt++;

		LOG_DBG("Conn %p gain updated (%zu/%zu streams done)", (void *)conn,
			active_proc->proc_done_cnt, active_proc->proc_cnt);
	}

	if (bt_cap_common_proc_is_aborted()) {
		LOG_DBG("Proc is aborted");
		if (bt_cap_common_proc_all_handled()) {
			LOG_DBG("All handled");
			cap_commander_proc_complete();
		}

		return;
	}

	if (!bt_cap_common_proc_is_done()) {
		const struct bt_cap_commander_proc_param *proc_param;

		proc_param = &active_proc->proc_param.commander[active_proc->proc_done_cnt];
		conn = proc_param->conn;
		active_proc->proc_initiated_cnt++;
		err = bt_aics_gain_set(proc_param->change_gain.aics, proc_param->change_gain.gain);
		if (err != 0) {
			LOG_DBG("Failed to set gain for conn %p: %d", (void *)conn, err);
			bt_cap_common_abort_proc(conn, err);
			cap_commander_proc_complete();
		}
	} else {
		cap_commander_proc_complete();
	}
}

int bt_cap_commander_change_microphone_gain_setting(
	const struct bt_cap_commander_change_microphone_gain_setting_param *param)
{
	const struct bt_cap_commander_proc_param *proc_param;
	struct bt_cap_common_proc *active_proc;
	struct bt_conn *conn;
	int err;

	if (bt_cap_common_proc_is_active()) {
		LOG_DBG("A CAP procedure is already in progress");

		return -EBUSY;
	}

	if (!valid_change_microphone_gain_param(param)) {
		return -EINVAL;
	}

	bt_cap_common_start_proc(BT_CAP_COMMON_PROC_TYPE_MICROPHONE_GAIN_CHANGE, param->count);

	mic_ctlr_cb.aics_cb.set_gain = cap_commander_micp_gain_set_cb;
	if (!micp_callbacks_registered && cap_commander_register_micp_callbacks() != 0) {
		LOG_DBG("Failed to register MICP callbacks");

		return -ENOEXEC;
	}

	active_proc = bt_cap_common_get_active_proc();

	for (size_t i = 0U; i < param->count; i++) {
		const union bt_cap_set_member *member = &param->param[i].member;
		struct bt_conn *member_conn = bt_cap_common_get_member_conn(param->type, member);
		struct bt_micp_mic_ctlr *mic_ctlr;
		struct bt_micp_included included;

		if (member_conn == NULL) {
			LOG_DBG("Invalid param->param[%zu].member", i);
			return -EINVAL;
		}

		mic_ctlr = bt_micp_mic_ctlr_get_by_conn(member_conn);
		if (mic_ctlr == NULL) {
			LOG_DBG("Invalid param->param[%zu].member mic_ctlr", i);
			return -EINVAL;
		}

		err = bt_micp_mic_ctlr_included_get(mic_ctlr, &included);
		if (err != 0 || included.aics_cnt == 0) {
			LOG_DBG("Invalid param->param[%zu].member aics", i);
			return -EINVAL;
		}

		/* Store the necessary parameters as we cannot assume that the supplied parameters
		 * are kept valid
		 */
		active_proc->proc_param.commander[i].conn = member_conn;
		active_proc->proc_param.commander[i].change_gain.gain = param->param[i].gain;
		/* TODO: For now we just use the first AICS instance
		 * - How should we handle multiple?
		 */
		active_proc->proc_param.commander[i].change_gain.aics = included.aics[0];
	}

	proc_param = &active_proc->proc_param.commander[0];
	conn = proc_param->conn;
	active_proc->proc_initiated_cnt++;

	err = bt_aics_gain_set(proc_param->change_gain.aics, proc_param->change_gain.gain);
	if (err != 0) {
		LOG_DBG("Failed to set gain for conn %p: %d", (void *)conn, err);
		return -ENOEXEC;
	}

	return 0;
}
#endif /* CONFIG_BT_MICP_MIC_CTLR_AICS */
#endif /* CONFIG_BT_MICP_MIC_CTLR */