Allow psartial transfers and use them for usbserial

include/grub/serial.h

@@ -67,8 +67,6 @@ struct grub_serial_port
   struct grub_serial_driver *driver;
   struct grub_serial_config config;
   int configured;
-  char buf[64];
-  int bufstart, bufend;
   /* This should be void *data but since serial is useful as an early console
      when malloc isn't available it's a union.
    */
@@ -80,6 +78,8 @@ struct grub_serial_port
       grub_usb_device_t usbdev;
       int configno;
       int interfno;
+      char buf[64];
+      int bufstart, bufend;
       struct grub_usb_desc_endp *in_endp;
       struct grub_usb_desc_endp *out_endp;
     };

include/grub/usb.h

@@ -107,7 +107,7 @@ struct grub_usb_controller_dev
 
   grub_usb_err_t (*transfer) (grub_usb_controller_t dev,
 			      grub_usb_transfer_t transfer,
-			      int timeout);
+			      int timeout, grub_size_t *actual);
 
   int (*hubports) (grub_usb_controller_t dev);
 
@@ -240,8 +240,8 @@ void grub_usb_poll_devices (void);
 
 void grub_usb_device_attach (grub_usb_device_t dev);
 grub_usb_err_t
-grub_usb_bulk_read_timeout (grub_usb_device_t dev,
-			    int endpoint, grub_size_t size, char *data,
-			    int timeout);
+grub_usb_bulk_read_extended (grub_usb_device_t dev,
+			     int endpoint, grub_size_t size, char *data,
+			     int timeout, grub_size_t *actual);
 
 #endif /* GRUB_USB_H */

include/grub/usbserial.h

@@ -28,4 +28,7 @@ void grub_usbserial_detach (grub_usb_device_t usbdev, int configno,
 int
 grub_usbserial_attach (grub_usb_device_t usbdev, int configno, int interfno,
 		       struct grub_serial_driver *driver);
+int
+grub_usbserial_fetch (struct grub_serial_port *port, grub_size_t header_size);
+
 #endif

include/grub/usbtrans.h

@@ -38,6 +38,7 @@ struct grub_usb_transaction
   int toggle;
   grub_transfer_type_t pid;
   grub_uint32_t data;
+  grub_size_t preceding;
 };
 typedef struct grub_usb_transaction *grub_usb_transaction_t;