USB: added MSC Host Driver with VFS support

Closes https://github.com/espressif/esp-idf/issues/6401

components/usb/include/usb/usb_helpers.h

@@ -11,6 +11,8 @@ Warning: The USB Host Library API is still a beta version and may be subject to
 #pragma once
 
 #include <stdint.h>
+#include "esp_err.h"
+#include "usb/usb_types_stack.h"
 #include "usb/usb_types_ch9.h"
 
 #ifdef __cplusplus
@@ -129,6 +131,25 @@ static inline int usb_round_up_to_mps(int num_bytes, int mps)
     return ((num_bytes + mps - 1) / mps) * mps;
 }
 
+/**
+ * @brief Print class specific descriptor callback
+ *
+ * Optional callback to be provided to usb_print_descriptors() function.
+ * The callback is called when when a non-standard descriptor is encountered.
+ * The callback should decode the descriptor as print it.
+ */
+
+typedef void (*print_class_descriptor_cb)(const usb_standard_desc_t *);
+
+/**
+ * @brief Prints usb descriptors
+ *
+ * @param[in] device Handle to device
+ * @param[in] class_specific_cb Optional callback to print class specific descriptors
+ * @return esp_err_t
+ */
+esp_err_t usb_print_descriptors(usb_device_handle_t device, print_class_descriptor_cb class_specific_cb);
+
 #ifdef __cplusplus
 }
 #endif

components/usb/include/usb/usb_types_ch9.h

@@ -214,6 +214,17 @@ _Static_assert(sizeof(usb_setup_packet_t) == USB_SETUP_PACKET_SIZE, "Size of usb
     (setup_pkt_ptr)->wLength = 0;   \
 })
 
+/**
+ * @brief Initializer for a request to get an string descriptor
+ */
+#define USB_SETUP_PACKET_INIT_GET_STR_DESC(setup_pkt_ptr, string_index, desc_len) ({ \
+    (setup_pkt_ptr)->bmRequestType = USB_BM_REQUEST_TYPE_DIR_IN | USB_BM_REQUEST_TYPE_TYPE_STANDARD | USB_BM_REQUEST_TYPE_RECIP_DEVICE; \
+    (setup_pkt_ptr)->bRequest = USB_B_REQUEST_GET_DESCRIPTOR; \
+    (setup_pkt_ptr)->wValue = (USB_W_VALUE_DT_STRING << 8) | ((string_index) & 0xFF); \
+    (setup_pkt_ptr)->wIndex = 0; \
+    (setup_pkt_ptr)->wLength = (desc_len); \
+})
+
 // ---------------- Standard Descriptor --------------------
 
 /**