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diff --git a/backend/mustek_scsi_pp.h b/backend/mustek_scsi_pp.h
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+/* sane - Scanner Access Now Easy.
+   Copyright (C) 2003 James Perry
+   This file is part of the SANE package.
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.  
+
+   This file implements the SCSI-over-parallel port protocol used in,
+   for example, the Paragon 600 II EP
+*/
+
+#ifndef mustek_scsi_pp_h
+#define mustek_scsi_pp_h
+
+static int mustek_scsi_pp_get_time (void);
+
+/**
+ * Open the connection to a Mustek SCSI-over-pp device.
+ *
+ * @param dev Port address as text.
+ * @param fd  Information about port address and I/O method. fd is not a file
+ *            descriptor. The name and type are used for compatibility reasons.
+ *
+ * @return
+ * - SANE_STATUS_GOOD - on success
+ * - SANE_STATUS_INVAL - if the port address can't be interpreted
+ * - SANE_STATUS_IO_ERROR - if the device file for a port couldn't be accessed
+ */
+static SANE_Status mustek_scsi_pp_open (const char *dev, int *fd);
+
+/**
+ * Close the connection to a Mustek SCSI-over-PP device.
+ *
+ * @param fd  Information about port address and I/O method.
+ *
+ */
+static void mustek_scsi_pp_close (int fd);
+
+/**
+ * Exit Mustek SCSI-over-PP.
+ */
+static void mustek_scsi_pp_exit (void);
+
+/**
+ * Find out if the device is ready to accept new commands.
+ *
+ * @param fd  Information about port address and I/O method.
+ *
+ * @return
+ * - SANE_STATUS_GOOD - if the device is ready
+ * - SANE_STATUS_DEVICE_BUSY if the device is still busy (try again later)
+ */
+static SANE_Status mustek_scsi_pp_test_ready (int fd);
+
+/**
+ * Send a command to the Mustek SCSI-over-pp device.
+ *
+ * @param fd  Information about port address and I/O method.
+ * @param src Data to be sent to the device.
+ * @param src_size Size of data to be sent to the device.
+ * @param dst Data to be received from the device.
+ * @param dst_size Size of data to be received from the device
+ *
+ * @return
+ * - SANE_STATUS_GOOD - on success
+ * - SANE_STATUS_IO_ERROR - if an error occured during the dialog with the
+ *   device
+ */
+static SANE_Status mustek_scsi_pp_cmd (int fd, const void *src, size_t src_size,
+				       void *dst, size_t * dst_size);
+
+/**
+ * Read scanned image data.
+ *
+ * @param fd  Information about port address and I/O method.
+ * @param planes Bytes per pixel (3 for color, 1 for all other modes)
+ * @param buf Buffer for image data.
+ * @param lines Number of lines
+ * @param bpl Bytes per line
+ *
+ * @return
+ * - SANE_STATUS_GOOD - on success
+ * - SANE_STATUS_IO_ERROR - if an error occured during the dialog with the 
+ *   device
+ */
+static SANE_Status mustek_scsi_pp_rdata (int fd, int planes,
+					 SANE_Byte * buf, int lines, int bpl);
+
+
+#endif /* mustek_scsi_pp_h */