/* SPDX-License-Identifier: GPL-2.0 */ /* * Driver for Microtek Scanmaker X6 USB scanner and possibly others. *  * (C) Copyright 2000 John Fremlin <vii@penguinpowered.com> * (C) Copyright 2000 Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de> * * See microtek.c for history * */ typedef void (*mts_scsi_cmnd_callback)(struct scsi_cmnd *);  struct mts_transfer_context{	struct mts_desc *instance;	mts_scsi_cmnd_callback final_callback;	struct scsi_cmnd *srb;		void *data;	unsigned data_length;	int data_pipe;	struct scatterlist *curr_sg; 	u8 *scsi_status; /* status returned from ep_response after command completion */};  struct mts_desc {	struct mts_desc *next;	struct mts_desc *prev; 	struct usb_device *usb_dev;	struct usb_interface *usb_intf; 	/* Endpoint addresses */	u8 ep_out;	u8 ep_response;	u8 ep_image; 	struct Scsi_Host *host; 	struct urb *urb;	struct mts_transfer_context context;};  #define MTS_EP_OUT	0x1#define MTS_EP_RESPONSE	0x2#define MTS_EP_IMAGE	0x3#define MTS_EP_TOTAL	0x3 #define MTS_SCSI_ERR_MASK ~0x3fu