[nrf fromtree] samples: usb: hid-keyboard: allow to set polling period at runtime

Add an example of how to set the polling period at runtime.

Signed-off-by: Johann Fischer <[email protected]>
(cherry picked from commit e295a38)

Author: jfischer-no

samples/subsys/usb/hid-keyboard/sample.yaml

@@ -33,3 +33,5 @@ tests:
   sample.usbd.hid-keyboard.large-out-report:
     extra_args:
       - EXTRA_DTC_OVERLAY_FILE="large_out_report.overlay"
+    extra_configs:
+      - CONFIG_USBD_HID_SET_POLLING_PERIOD=y

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

@@ -206,6 +206,18 @@ int main(void)
 		return ret;
 	}
 
+	if (IS_ENABLED(CONFIG_USBD_HID_SET_POLLING_PERIOD)) {
+		ret = hid_device_set_in_polling(hid_dev, 1000);
+		if (ret) {
+			LOG_WRN("Failed to set IN report polling period, %d", ret);
+		}
+
+		ret = hid_device_set_out_polling(hid_dev, 1000);
+		if (ret != 0 && ret != -ENOTSUP) {
+			LOG_WRN("Failed to set OUT report polling period, %d", ret);
+		}
+	}
+
 	sample_usbd = sample_usbd_init_device(msg_cb);
 	if (sample_usbd == NULL) {
 		LOG_ERR("Failed to initialize USB device");