profiles/audio/ccp: Add CCP plugin for call control profile

This adds initial code for CCP plugin which handle CALL CONTROL PROFILE for
Telephone Bearer Services and Generic Telephone Bearer Services in the
client role.
This has been tested using teams application by initiating call between
Linux BTOE and Windows server with LE audio enabled.

Makefile.plugins

@@ -138,6 +138,11 @@ builtin_modules += micp
 builtin_sources += profiles/audio/micp.c
 endif
 
+if CCP
+builtin_modules += ccp
+builtin_sources += profiles/audio/ccp.c
+endif
+
 if CSIP
 builtin_modules += csip
 builtin_sources += profiles/audio/csip.c

configure.ac

@@ -200,6 +200,10 @@ AC_ARG_ENABLE(mcp, AS_HELP_STRING([--disable-mcp],
         [disable MCP profile]), [enable_mcp=${enableval}])
 AM_CONDITIONAL(MCP, test "${enable_mcp}" != "no")
 
+AC_ARG_ENABLE(ccp, AS_HELP_STRING([--disable-ccp],
+        [disable CCP profile]), [enable_ccp=${enableval}])
+AM_CONDITIONAL(CCP, test "${enable_ccp}" != "no")
+
 AC_ARG_ENABLE(vcp, AS_HELP_STRING([--disable-vcp],
 		[disable VCP profile]), [enable_vcp=${enableval}])
 AM_CONDITIONAL(VCP, test "${enable_vcp}" != "no")

profiles/audio/ccp.c

@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2024  Intel Corporation. All rights reserved.
+ *
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <glib.h>
+
+#include "gdbus/gdbus.h"
+
+#include "lib/bluetooth.h"
+#include "lib/hci.h"
+#include "lib/sdp.h"
+#include "lib/uuid.h"
+
+#include "src/dbus-common.h"
+#include "src/shared/util.h"
+#include "src/shared/att.h"
+#include "src/shared/queue.h"
+#include "src/shared/gatt-db.h"
+#include "src/shared/gatt-client.h"
+#include "src/shared/gatt-server.h"
+#include "src/shared/ccp.h"
+
+#include "btio/btio.h"
+#include "src/plugin.h"
+#include "src/adapter.h"
+#include "src/gatt-database.h"
+#include "src/device.h"
+#include "src/profile.h"
+#include "src/service.h"
+#include "src/log.h"
+#include "src/error.h"
+
+#define GTBS_UUID_STR "0000184C-0000-1000-8000-00805f9b34fb"
+
+struct ccp_data {
+	struct btd_device *device;
+	struct btd_service *service;
+	struct bt_ccp *ccp;
+	unsigned int state_id;
+};
+
+static void ccp_debug(const char *str, void *user_data)
+{
+	DBG_IDX(0xffff, "%s", str);
+}
+
+static struct ccp_data *ccp_data_new(struct btd_device *device)
+{
+	struct ccp_data *data;
+
+	data = new0(struct ccp_data, 1);
+	data->device = device;
+
+	return data;
+}
+
+static int ccp_probe(struct btd_service *service)
+{
+	struct btd_device *device = btd_service_get_device(service);
+	struct btd_adapter *adapter = device_get_adapter(device);
+	struct btd_gatt_database *database = btd_adapter_get_database(adapter);
+	struct ccp_data *data = btd_service_get_user_data(service);
+	char addr[18];
+
+	ba2str(device_get_address(device), addr);
+	DBG("%s", addr);
+
+	if (data) {
+		error("Profile probed twice for the same device!");
+		return -EINVAL;
+	}
+
+	data = ccp_data_new(device);
+	data->service = service;
+
+	data->ccp = bt_ccp_new(btd_gatt_database_get_db(database),
+			       btd_device_get_gatt_db(device));
+
+	bt_ccp_set_debug(data->ccp, ccp_debug, NULL, NULL);
+	btd_service_set_user_data(service, data);
+
+	return 0;
+}
+
+static void ccp_data_free(struct ccp_data *data)
+{
+	if (data->service) {
+		btd_service_set_user_data(data->service, NULL);
+		bt_ccp_set_user_data(data->ccp, NULL);
+	}
+
+	bt_ccp_unref(data->ccp);
+	free(data);
+}
+
+static void ccp_data_remove(struct ccp_data *data)
+{
+	DBG("data %p", data);
+
+	ccp_data_free(data);
+}
+
+static void ccp_remove(struct btd_service *service)
+{
+	struct btd_device *device = btd_service_get_device(service);
+	struct ccp_data *data;
+	char addr[18];
+
+	ba2str(device_get_address(device), addr);
+	DBG("%s", addr);
+
+	data = btd_service_get_user_data(service);
+	if (!data) {
+		error("CCP service not handled by profile");
+		return;
+	}
+
+	ccp_data_remove(data);
+}
+
+static int ccp_accept(struct btd_service *service)
+{
+	struct btd_device *device = btd_service_get_device(service);
+	struct bt_gatt_client *client = btd_device_get_gatt_client(device);
+	struct ccp_data *data = btd_service_get_user_data(service);
+	char addr[18];
+
+	ba2str(device_get_address(device), addr);
+	DBG("%s", addr);
+
+	if (!bt_ccp_attach(data->ccp, client)) {
+		error("CCP unable to attach");
+		return -EINVAL;
+	}
+
+	/* TODO: register telephony operations here */
+
+	btd_service_connecting_complete(service, 0);
+
+	return 0;
+}
+
+static int ccp_connect(struct btd_service *service)
+{
+	struct btd_device *device = btd_service_get_device(service);
+	char addr[18];
+
+	ba2str(device_get_address(device), addr);
+	DBG("%s", addr);
+
+	return 0;
+}
+
+static int ccp_disconnect(struct btd_service *service)
+{
+	struct btd_device *device = btd_service_get_device(service);
+	struct ccp_data *data = btd_service_get_user_data(service);
+	char addr[18];
+
+	ba2str(device_get_address(device), addr);
+	DBG("%s", addr);
+
+	bt_ccp_detach(data->ccp);
+
+	btd_service_disconnecting_complete(service, 0);
+
+	return 0;
+}
+
+static int ccp_server_probe(struct btd_profile *p, struct btd_adapter *adapter)
+{
+	struct btd_gatt_database *database = btd_adapter_get_database(adapter);
+
+	bt_ccp_register(btd_gatt_database_get_db(database));
+
+	return 0;
+}
+
+static void
+ccp_server_remove(struct btd_profile *p,
+		  struct btd_adapter *adapter)
+{
+	DBG("CCP remove adapter");
+}
+
+static struct btd_profile ccp_profile = {
+	.name			= "ccp",
+	.priority		= BTD_PROFILE_PRIORITY_MEDIUM,
+	.remote_uuid	= GTBS_UUID_STR,
+	.device_probe	= ccp_probe,
+	.device_remove	= ccp_remove,
+	.accept			= ccp_accept,
+	.connect		= ccp_connect,
+	.disconnect		= ccp_disconnect,
+
+	.adapter_probe	= ccp_server_probe,
+	.adapter_remove = ccp_server_remove,
+
+	.experimental	= true,
+};
+
+static int ccp_init(void)
+{
+	return btd_profile_register(&ccp_profile);
+}
+
+static void ccp_exit(void)
+{
+	btd_profile_unregister(&ccp_profile);
+}
+
+BLUETOOTH_PLUGIN_DEFINE(ccp, VERSION, BLUETOOTH_PLUGIN_PRIORITY_DEFAULT,
+			ccp_init, ccp_exit)