Bluetooth: Seperate BT_ISO and BT_AUDIO

ISO is a building block for BT_AUDIO but it is not only
useful for AUDIO, and as such should be possible to
enable without enabling BT_AUDIO.

This commit moves iso.c and iso_internal.h to the
host directory (from host/audio) and removes
the CMakeLists.txt.

The /audio directory is left intact for the Kconfig options
it provides, and as a directory for future BLE Audio
content.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

subsys/bluetooth/Kconfig

@@ -225,6 +225,7 @@ endif # BT_CONN
 
 config BT_ISO
 	bool "Bluetooth Isochronous Channel Support [EXPERIMENTAL]"
+	depends on BT_CONN
 	help
 	  Select this to enable Isochronous Channel support.
 

subsys/bluetooth/host/CMakeLists.txt

@@ -60,6 +60,11 @@ if(CONFIG_BT_HCI_HOST)
     endif()
   endif()
 
+  zephyr_library_sources_ifdef(
+    CONFIG_BT_ISO
+    iso.c
+    )
+
   if(CONFIG_BT_DF)
     zephyr_library_sources(
       direction.c
@@ -101,5 +106,3 @@ if(CONFIG_BT_CONN_DISABLE_SECURITY)
   Do not use in production."
     )
 endif()
-
-add_subdirectory_ifdef(CONFIG_BT_AUDIO audio)

subsys/bluetooth/host/audio/CMakeLists.txt

@@ -1,6 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-zephyr_library()
-zephyr_library_link_libraries(subsys__bluetooth)
-
-zephyr_library_sources_ifdef(CONFIG_BT_ISO iso.c)

subsys/bluetooth/host/buf.c

@@ -10,7 +10,7 @@
 
 #include "hci_core.h"
 #include "conn_internal.h"
-#include "audio/iso_internal.h"
+#include "iso_internal.h"
 
 #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_CORE)
 #define LOG_MODULE_NAME bt_buf

subsys/bluetooth/host/conn.c

@@ -35,7 +35,7 @@
 #include "ssp.h"
 #include "att_internal.h"
 #include "gatt_internal.h"
-#include "audio/iso_internal.h"
+#include "iso_internal.h"
 
 /* Peripheral timeout to initialize Connection Parameter Update procedure */
 #define CONN_UPDATE_TIMEOUT  K_MSEC(CONFIG_BT_CONN_PARAM_UPDATE_TIMEOUT)

subsys/bluetooth/host/conn_internal.h

@@ -182,7 +182,7 @@ struct bt_conn {
 		struct bt_conn_br	br;
 		struct bt_conn_sco	sco;
 #endif
-#if defined(CONFIG_BT_AUDIO)
+#if defined(CONFIG_BT_ISO)
 		struct bt_conn_iso	iso;
 #endif
 	};

subsys/bluetooth/host/hci_core.c

@@ -40,7 +40,7 @@
 #include "ecc.h"
 
 #include "conn_internal.h"
-#include "audio/iso_internal.h"
+#include "iso_internal.h"
 #include "l2cap_internal.h"
 #include "gatt_internal.h"
 #include "smp.h"