lx_emul: add implementation for Genode's USB C-API

Fix #4444

repos/dde_linux/src/include/lx_emul/usb.h

@@ -0,0 +1,27 @@
+/*
+ * \brief  Lx_emul support for USB
+ * \author Stefan Kalkowski
+ * \date   2022-03-08
+ */
+
+/*
+ * Copyright (C) 2022 Genode Labs GmbH
+ *
+ * This file is distributed under the terms of the GNU General Public License
+ * version 2.
+ */
+
+#ifndef _LX_EMUL__USB_H_
+#define _LX_EMUL__USB_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct genode_usb_rpc_callbacks lx_emul_usb_rpc_callbacks;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LX_EMUL__USB_H_ */

repos/dde_linux/src/lib/lx_emul/usb.c

@@ -155,7 +155,7 @@ static int endpoint_descriptor(genode_usb_bus_num_t bus,
 }
 
 
-struct genode_usb_rpc_callbacks genode_usb_rpc_callbacks_obj = {
+struct genode_usb_rpc_callbacks lx_emul_usb_rpc_callbacks = {
 	.alloc_fn        = lx_emul_shared_dma_buffer_allocate,
 	.free_fn         = lx_emul_shared_dma_buffer_free,
 	.cfg_desc_fn     = config_descriptor,

repos/pc/src/drivers/usb_host/pc/main.cc

@@ -16,6 +16,7 @@
 #include <base/env.h>
 
 #include <lx_emul/init.h>
+#include <lx_emul/usb.h>
 #include <lx_kit/env.h>
 #include <lx_kit/init.h>
 #include <lx_user/io.h>
@@ -27,8 +28,6 @@ using namespace Genode;
 
 static bool _bios_handoff;
 
-extern struct genode_usb_rpc_callbacks genode_usb_rpc_callbacks_obj;
-
 
 extern "C" int inhibit_pci_fixup(char const *name)
 {
@@ -76,7 +75,7 @@ struct Main : private Entrypoint::Io_progress_handler
 		genode_usb_init(genode_env_ptr(env),
 		                genode_allocator_ptr(sliced_heap),
 		                genode_signal_handler_ptr(signal_handler),
-		                &genode_usb_rpc_callbacks_obj);
+		                &lx_emul_usb_rpc_callbacks);
 
 		lx_emul_start_kernel(nullptr);
 

repos/pc/src/drivers/usb_host/pc/target.inc

@@ -12,10 +12,10 @@ SRC_CC  += time.cc
 SRC_CC  += lx_emul/shared_dma_buffer.cc
 SRC_C   += dummies.c
 SRC_C   += lx_emul.c
-SRC_C   += usb.c
 SRC_C   += $(notdir $(wildcard $(REL_PRG_DIR)/generated_dummies.c))
 SRC_C   += common_dummies.c
 SRC_C   += lx_emul/spec/x86/pci.c
+SRC_C   += lx_emul/usb.c
 
 vpath %.c $(REL_PRG_DIR)
 vpath %.cc $(REL_PRG_DIR)