usb: device_next: add device configuration change notification

Notify only if the device configuration has changed. Pass only the
configuration value as the message status, the actual device speed can
be obtained with usbd_bus_speed().

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

include/zephyr/usb/usbd_msg.h

@@ -40,6 +40,8 @@ enum usbd_msg_type {
 	USBD_MSG_SUSPEND,
 	/** Bus reset detected */
 	USBD_MSG_RESET,
+	/** Device changed configuration */
+	USBD_MSG_CONFIGURATION,
 	/** Non-correctable UDC error message  */
 	USBD_MSG_UDC_ERROR,
 	/** Unrecoverable device stack error message  */
@@ -61,6 +63,7 @@ static const char *const usbd_msg_type_list[] = {
 	"Device resumed",
 	"Device suspended",
 	"Bus reset",
+	"New device configuration",
 	"Controller error",
 	"Stack error",
 	"CDC ACM line coding",

samples/subsys/usb/hid-keyboard/src/main.c

@@ -149,6 +149,10 @@ static void msg_cb(struct usbd_context *const usbd_ctx,
 {
 	LOG_INF("USBD message: %s", usbd_msg_type_string(msg->type));
 
+	if (msg->type == USBD_MSG_CONFIGURATION) {
+		LOG_INF("\tConfiguration value %d", msg->status);
+	}
+
 	if (usbd_can_detect_vbus(usbd_ctx)) {
 		if (msg->type == USBD_MSG_VBUS_READY) {
 			if (usbd_enable(usbd_ctx)) {

subsys/usb/device_next/usbd_ch9.c

@@ -19,6 +19,7 @@
 #include "usbd_class.h"
 #include "usbd_class_api.h"
 #include "usbd_interface.h"
+#include "usbd_msg.h"
 
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(usbd_ch9, CONFIG_USBD_LOG_LEVEL);
@@ -171,6 +172,10 @@ static int sreq_set_configuration(struct usbd_context *const uds_ctx)
 		uds_ctx->ch9_data.state = USBD_STATE_CONFIGURED;
 	}
 
+	if (ret == 0) {
+		usbd_msg_pub_simple(uds_ctx, USBD_MSG_CONFIGURATION, setup->wValue);
+	}
+
 	return ret;
 }