feat(ext_hub): Added External Hub driver

components/usb/private_include/hub.h

@@ -8,10 +8,15 @@
 
 #include <stdlib.h>
 #include <stdint.h>
+#include "sdkconfig.h"
 #include "esp_err.h"
 #include "usb_private.h"
 #include "usbh.h"
 
+#if CONFIG_USB_HOST_HUBS_SUPPORTED
+#define ENABLE_USB_HUBS                     1
+#endif // CONFIG_USB_HOST_HUBS_SUPPORTED
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -138,6 +143,50 @@ esp_err_t hub_port_recycle(usb_device_handle_t parent_dev_hdl, uint8_t parent_po
  */
 esp_err_t hub_port_reset(usb_device_handle_t parent_dev_hdl, uint8_t parent_port_num);
 
+/**
+ * @brief Activate the port
+ *
+ * @note This function should only be called from the Host Library task
+ *
+ * @param[in] parent_dev_hdl    Parent device handle (is used to get the External Hub handle)
+ * @param[in] parent_port_num   Parent number (is used to specify the External Port)
+ * @return
+ *     - ESP_OK: Success
+ */
+esp_err_t hub_port_active(usb_device_handle_t parent_dev_hdl, uint8_t parent_port_num);
+
+#if ENABLE_USB_HUBS
+/**
+ * @brief Notify Hub driver that new device has been attached
+ *
+ * If device is has a HUB class, then it will be added as External Hub to Hub Driver.
+ *
+ * @param[in] dev_addr  Device bus address
+ * @return
+ *     - ESP_OK: Success
+ */
+esp_err_t hub_notify_new_dev(uint8_t dev_addr);
+
+/**
+ * @brief Notify Hub driver that device has been removed
+ *
+ * If the device was an External Hub, then it will be removed from the Hub Driver.
+ *
+ * @param[in] dev_addr  Device bus address
+ * @return
+ *     - ESP_OK: Success
+ */
+esp_err_t hub_notify_dev_gone(uint8_t dev_addr);
+
+/**
+ * @brief Notify Hub driver that all devices should be freed
+ *
+ * @return
+ *     - ESP_OK: Success
+ */
+esp_err_t hub_notify_all_free(void);
+#endif // ENABLE_USB_HUBS
+
 /**
  * @brief Hub driver's processing function
  *