subsys: usb: host: class: Add CDC ECM class support for USBH

Add support for the USB CDC ECM (Ethernet Control Model) class to the
USB host subsystem. This implementation enables Ethernet functionality
for USB host.

Signed-off-by: Santhosh Charles <[email protected]>

Author: santhosh-c-c

subsys/usb/host/CMakeLists.txt

@@ -18,6 +18,11 @@ zephyr_library_sources_ifdef(
 	usbh_shell.c
 )
 
+zephyr_library_sources_ifdef(
+	CONFIG_USBH_CDC_ECM_CLASS
+	class/usbh_cdc_ecm.c
+)
+
 zephyr_library_sources_ifdef(
   CONFIG_USBIP
   usbip.c

subsys/usb/host/Kconfig

@@ -54,5 +54,6 @@ config USBH_MAX_UHC_MSG
 	  Maximum number of USB host controller events that can be queued.
 
 rsource "Kconfig.usbip"
+rsource "class/Kconfig"
 
 endif # USB_HOST_STACK

subsys/usb/host/class/Kconfig

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2025 Linumiz GmbH
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+rsource "Kconfig.cdc_ecm_host"

subsys/usb/host/class/Kconfig.cdc_ecm_host

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 Linumiz GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config USBH_CDC_ECM_CLASS
+	bool "USB Host CDC ECM Class implementation"
+	default y
+	depends on NET_L2_ETHERNET
+	depends on DT_HAS_ZEPHYR_USBH_CDC_ECM_ENABLED
+	help
+	  USB Host CDC Ethernet Control Model (ECM) implementation.
+	  Supports communication with CDC ECM-compliant USB Ethernet devices.
+
+if USBH_CDC_ECM_CLASS
+
+module = USBH_CDC_ECM
+module-str = "usbh cdc_ecm"
+default-count = 1
+source "subsys/logging/Kconfig.template.log_config"
+
+endif # USBH_CDC_ECM_CLASS