/* 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