New upstream version 1.0.29upstream/1.0.29

1 files changed, 0 insertions, 2059 deletions

diff --git a/backend/genesys_low.cc b/backend/genesys_low.cc
deleted file mode 100644
index 097375f..0000000
--- a/backend/genesys_low.cc
+++ /dev/null
@@ -1,2059 +0,0 @@
-/* sane - Scanner Access Now Easy.
-
-   Copyright (C) 2010-2013 Stéphane Voltz <stef.dev@free.fr>
-
-
-   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.
-*/
-
-#define DEBUG_DECLARE_ONLY
-
-#include "genesys_low.h"
-#include "assert.h"
-
-#include <vector>
-
-
-Genesys_Device::~Genesys_Device()
-{
-    clear();
-
-    if (file_name != nullptr)
-        free(file_name);
-}
-
-void Genesys_Device::clear()
-{
-    read_buffer.clear();
-    lines_buffer.clear();
-    shrink_buffer.clear();
-    out_buffer.clear();
-    binarize_buffer.clear();
-    local_buffer.clear();
-
-    calib_file.clear();
-
-    calibration_cache.clear();
-
-    white_average_data.clear();
-    dark_average_data.clear();
-}
-
-/* ------------------------------------------------------------------------ */
-/*                  functions calling ASIC specific functions               */
-/* ------------------------------------------------------------------------ */
-
-/**
- * setup the hardware dependent functions
- */
-SANE_Status
-sanei_genesys_init_cmd_set (Genesys_Device * dev)
-{
-  DBG_INIT ();
-  switch (dev->model->asic_type)
-    {
-    case GENESYS_GL646:
-      return sanei_gl646_init_cmd_set (dev);
-    case GENESYS_GL841:
-      return sanei_gl841_init_cmd_set (dev);
-    case GENESYS_GL843:
-      return sanei_gl843_init_cmd_set (dev);
-    case GENESYS_GL845: /* since only a few reg bits differs
-                           we handle both together */
-    case GENESYS_GL846:
-      return sanei_gl846_init_cmd_set (dev);
-    case GENESYS_GL847:
-      return sanei_gl847_init_cmd_set (dev);
-    case GENESYS_GL124:
-      return sanei_gl124_init_cmd_set (dev);
-    default:
-      return SANE_STATUS_INVAL;
-    }
-}
-
-/* ------------------------------------------------------------------------ */
-/*                  General IO and debugging functions                      */
-/* ------------------------------------------------------------------------ */
-
-SANE_Status sanei_genesys_write_file(const char *filename, uint8_t * data, size_t length)
-{
-    FILE *out;
-
-    out = fopen (filename, "w");
-    if (!out) {
-        DBG(DBG_error, "%s: could nor open %s for writing: %s\n", __func__, filename,
-            strerror(errno));
-        return SANE_STATUS_INVAL;
-    }
-    fwrite(data, 1, length, out);
-    fclose(out);
-
-    DBG(DBG_proc, "%s: finished\n", __func__);
-    return SANE_STATUS_GOOD;
-}
-
-/* Write data to a pnm file (e.g. calibration). For debugging only */
-/* data is RGB or grey, with little endian byte order */
-SANE_Status
-sanei_genesys_write_pnm_file (const char *filename, uint8_t * data, int depth,
-			      int channels, int pixels_per_line, int lines)
-{
-  FILE *out;
-  int count;
-
-  DBG(DBG_info, "%s: depth=%d, channels=%d, ppl=%d, lines=%d\n", __func__,depth, channels,
-      pixels_per_line, lines);
-
-  out = fopen (filename, "w");
-  if (!out)
-    {
-      DBG(DBG_error, "%s: could nor open %s for writing: %s\n", __func__, filename,
-          strerror(errno));
-      return SANE_STATUS_INVAL;
-    }
-  if(depth==1)
-    {
-      fprintf (out, "P4\n%d\n%d\n", pixels_per_line, lines);
-    }
-  else
-    {
-      fprintf (out, "P%c\n%d\n%d\n%d\n", channels == 1 ? '5' : '6',
-	   pixels_per_line, lines, (int) pow (2, depth) - 1);
-    }
-  if (channels == 3)
-    {
-      for (count = 0; count < (pixels_per_line * lines * 3); count++)
-	{
-	  if (depth == 16)
-	    fputc (*(data + 1), out);
-	  fputc (*(data++), out);
-	  if (depth == 16)
-	    data++;
-	}
-    }
-  else
-    {
-      if (depth==1)
-        {
-          pixels_per_line/=8;
-        }
-      for (count = 0; count < (pixels_per_line * lines); count++)
-	{
-          switch (depth)
-            {
-              case 8:
-	        fputc (*(data + count), out);
-                break;
-              case 16:
-	        fputc (*(data + 1), out);
-	        fputc (*(data), out);
-	        data += 2;
-                break;
-              default:
-                fputc(data[count], out);
-                break;
-            }
-	}
-    }
-  fclose (out);
-
-  DBG(DBG_proc, "%s: finished\n", __func__);
-  return SANE_STATUS_GOOD;
-}
-
-/* ------------------------------------------------------------------------ */
-/*                  Read and write RAM, registers and AFE                   */
-/* ------------------------------------------------------------------------ */
-
-extern unsigned sanei_genesys_get_bulk_max_size(Genesys_Device * dev)
-{
-    /*  Genesys supports 0xFE00 maximum size in general, wheraus GL646 supports
-        0xFFC0. We use 0xF000 because that's the packet limit in the Linux usbmon
-        USB capture stack. By default it limits packet size to b_size / 5 where
-        b_size is the size of the ring buffer. By default it's 300*1024, so the
-        packet is limited 61440 without any visibility to acquiring software.
-    */
-    if (dev->model->asic_type == GENESYS_GL124 ||
-        dev->model->asic_type == GENESYS_GL846 ||
-        dev->model->asic_type == GENESYS_GL847) {
-        return 0xeff0;
-    }
-    return 0xf000;
-}
-
-void sanei_genesys_bulk_read_data_send_header(Genesys_Device* dev, size_t len)
-{
-    DBG_HELPER(dbg);
-
-    uint8_t outdata[8];
-    if (dev->model->asic_type == GENESYS_GL124 ||
-        dev->model->asic_type == GENESYS_GL846 ||
-        dev->model->asic_type == GENESYS_GL847)
-    {
-        // hard coded 0x10000000 address
-        outdata[0] = 0;
-        outdata[1] = 0;
-        outdata[2] = 0;
-        outdata[3] = 0x10;
-    } else if (dev->model->asic_type == GENESYS_GL841 ||
-               dev->model->asic_type == GENESYS_GL843) {
-        outdata[0] = BULK_IN;
-        outdata[1] = BULK_RAM;
-        outdata[2] = VALUE_BUFFER & 0xff;
-        outdata[3] = (VALUE_BUFFER >> 8) & 0xff;
-    } else {
-        outdata[0] = BULK_IN;
-        outdata[1] = BULK_RAM;
-        outdata[2] = 0x00;
-        outdata[3] = 0x00;
-    }
-
-    /* data size to transfer */
-    outdata[4] = (len & 0xff);
-    outdata[5] = ((len >> 8) & 0xff);
-    outdata[6] = ((len >> 16) & 0xff);
-    outdata[7] = ((len >> 24) & 0xff);
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_BUFFER, 0x00,
-                             sizeof(outdata), outdata);
-}
-
-SANE_Status sanei_genesys_bulk_read_data(Genesys_Device * dev, uint8_t addr, uint8_t* data,
-                                         size_t len)
-{
-    DBG_HELPER(dbg);
-
-    // currently supported: GL646, GL841, GL843, GL846, GL847, GL124
-    size_t size, target;
-    uint8_t *buffer;
-
-    unsigned is_addr_used = 1;
-    unsigned has_header_before_each_chunk = 0;
-    if (dev->model->asic_type == GENESYS_GL124 ||
-        dev->model->asic_type == GENESYS_GL846 ||
-        dev->model->asic_type == GENESYS_GL847)
-    {
-        is_addr_used = 0;
-        has_header_before_each_chunk = 1;
-    }
-
-    if (is_addr_used) {
-        DBG(DBG_io, "%s: requesting %lu bytes from 0x%02x addr\n", __func__, (u_long) len, addr);
-    } else {
-        DBG(DBG_io, "%s: requesting %lu bytes\n", __func__, (u_long) len);
-    }
-
-    if (len == 0)
-        return SANE_STATUS_GOOD;
-
-    if (is_addr_used) {
-        dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_SET_REGISTER, 0x00,
-                                 1, &addr);
-    }
-
-    target = len;
-    buffer = data;
-
-    size_t max_in_size = sanei_genesys_get_bulk_max_size(dev);
-
-    if (!has_header_before_each_chunk) {
-        sanei_genesys_bulk_read_data_send_header(dev, len);
-    }
-
-    // loop until computed data size is read
-    while (target) {
-        if (target > max_in_size) {
-            size = max_in_size;
-        } else {
-            size = target;
-        }
-
-        if (has_header_before_each_chunk) {
-            sanei_genesys_bulk_read_data_send_header(dev, size);
-        }
-
-        DBG(DBG_io2, "%s: trying to read %lu bytes of data\n", __func__, (u_long) size);
-
-        dev->usb_dev.bulk_read(data, &size);
-
-        DBG(DBG_io2, "%s: read %lu bytes, %lu remaining\n", __func__,
-            (u_long) size, (u_long) (target - size));
-
-        target -= size;
-        data += size;
-    }
-
-    if (DBG_LEVEL >= DBG_data && dev->binary!=NULL) {
-        fwrite(buffer, len, 1, dev->binary);
-    }
-
-    return SANE_STATUS_GOOD;
-}
-
-SANE_Status sanei_genesys_bulk_write_data(Genesys_Device * dev, uint8_t addr, uint8_t* data,
-                                          size_t len)
-{
-    DBG_HELPER(dbg);
-
-    // supported: GL646, GL841, GL843
-    size_t size;
-    uint8_t outdata[8];
-
-    DBG(DBG_io, "%s writing %lu bytes\n", __func__, (u_long) len);
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_SET_REGISTER, INDEX,
-                             1, &addr);
-
-
-    size_t max_out_size = sanei_genesys_get_bulk_max_size(dev);
-
-    while (len) {
-        if (len > max_out_size)
-            size = max_out_size;
-        else
-            size = len;
-
-        if (dev->model->asic_type == GENESYS_GL841) {
-            outdata[0] = BULK_OUT;
-            outdata[1] = BULK_RAM;
-            outdata[2] = VALUE_BUFFER & 0xff;
-            outdata[3] = (VALUE_BUFFER >> 8) & 0xff;
-        } else {
-            outdata[0] = BULK_OUT;
-            outdata[1] = BULK_RAM;
-            outdata[2] = 0x00;
-            outdata[3] = 0x00;
-        }
-
-        outdata[4] = (size & 0xff);
-        outdata[5] = ((size >> 8) & 0xff);
-        outdata[6] = ((size >> 16) & 0xff);
-        outdata[7] = ((size >> 24) & 0xff);
-
-        dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_BUFFER, 0x00,
-                                 sizeof(outdata), outdata);
-
-        dev->usb_dev.bulk_write(data, &size);
-
-        DBG(DBG_io2, "%s: wrote %lu bytes, %lu remaining\n", __func__, (u_long) size,
-            (u_long) (len - size));
-
-        len -= size;
-        data += size;
-    }
-
-    return SANE_STATUS_GOOD;
-}
-
-/** @brief write to one high (addr >= 0x100) register
- * write to a register which address is higher than 0xff.
- * @param dev opened device to write to
- * @param reg LSB of register address
- * @param val value to write
- */
-SANE_Status
-sanei_genesys_write_hregister (Genesys_Device * dev, uint16_t reg, uint8_t val)
-{
-    DBG_HELPER(dbg);
-
-  uint8_t buffer[2];
-
-  buffer[0]=reg & 0xff;
-  buffer[1]=val;
-
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, 0x100 | VALUE_SET_REGISTER, INDEX,
-                             2, buffer);
-
-    DBG(DBG_io, "%s (0x%02x, 0x%02x) completed\n", __func__, reg, val);
-
-    return SANE_STATUS_GOOD;
-}
-
-/** @brief read from one high (addr >= 0x100) register
- * Read to a register which address is higher than 0xff. Second byte is check to detect
- * physical link errors.
- * @param dev opened device to read from
- * @param reg LSB of register address
- * @param val value to write
- */
-SANE_Status
-sanei_genesys_read_hregister (Genesys_Device * dev, uint16_t reg, uint8_t * val)
-{
-    DBG_HELPER(dbg);
-
-  SANE_Byte value[2];
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_IN, REQUEST_BUFFER, 0x100 | VALUE_GET_REGISTER,
-                             0x22+((reg & 0xff)<<8), 2, value);
-
-  *val=value[0];
-  DBG(DBG_io2, "%s(0x%02x)=0x%02x\n", __func__, reg, *val);
-
-  /* check usb link status */
-  if((value[1] & 0xff) != 0x55)
-    {
-      DBG(DBG_error,"%s: invalid read, scanner unplugged ?\n", __func__);
-        return SANE_STATUS_IO_ERROR;
-    }
-    return SANE_STATUS_GOOD;
-}
-
-/**
- * Write to one GL847 ASIC register
-URB    10  control  0x40 0x04 0x83 0x00 len     2 wrote 0xa6 0x04
- */
-static SANE_Status
-sanei_genesys_write_gl847_register (Genesys_Device * dev, uint8_t reg, uint8_t val)
-{
-    DBG_HELPER(dbg);
-
-  uint8_t buffer[2];
-
-  buffer[0]=reg;
-  buffer[1]=val;
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_SET_REGISTER, INDEX,
-                             2, buffer);
-
-  DBG(DBG_io, "%s (0x%02x, 0x%02x) completed\n", __func__, reg, val);
-
-    return SANE_STATUS_GOOD;
-}
-
-/**
- * Write to one ASIC register
- */
-SANE_Status
-sanei_genesys_write_register (Genesys_Device * dev, uint16_t reg, uint8_t val)
-{
-    DBG_HELPER(dbg);
-
-  SANE_Byte reg8;
-
-  /* 16 bit register address space */
-  if(reg>255)
-    {
-      return sanei_genesys_write_hregister(dev, reg, val);
-    }
-
-  /* route to gl847 function if needed */
-  if(dev->model->asic_type==GENESYS_GL847
-  || dev->model->asic_type==GENESYS_GL845
-  || dev->model->asic_type==GENESYS_GL846
-  || dev->model->asic_type==GENESYS_GL124)
-    {
-      return sanei_genesys_write_gl847_register(dev, reg, val);
-    }
-
-  reg8=reg & 0xff;
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_SET_REGISTER, INDEX,
-                             1, &reg8);
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_WRITE_REGISTER, INDEX,
-                             1, &val);
-
-  DBG(DBG_io, "%s (0x%02x, 0x%02x) completed\n", __func__, reg, val);
-
-    return SANE_STATUS_GOOD;
-}
-
-/**
- * @brief write command to 0x8c endpoint
- * Write a value to 0x8c end point (end access), for USB firmware related operations
- * Known values are 0x0f, 0x11 for USB 2.0 data transfer and 0x0f,0x14 for USB1.1
- * @param dev device to write to
- * @param index index of the command
- * @param val value to write
- */
-SANE_Status
-sanei_genesys_write_0x8c(Genesys_Device * dev, uint8_t index, uint8_t val)
-{
-    DBG_HELPER_ARGS(dbg, "0x%02x,0x%02x", index, val);
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_BUF_ENDACCESS, index,
-                             1, &val);
-    return SANE_STATUS_GOOD;
-}
-
-/* read reg 0x41:
- * URB   164  control  0xc0 0x04 0x8e 0x4122 len     2 read  0xfc 0x55
- */
-static SANE_Status
-sanei_genesys_read_gl847_register (Genesys_Device * dev, uint16_t reg, uint8_t * val)
-{
-    DBG_HELPER(dbg);
-  SANE_Status status = SANE_STATUS_GOOD;
-  SANE_Byte value[2];
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_IN, REQUEST_BUFFER, VALUE_GET_REGISTER, 0x22+(reg<<8),
-                             2, value);
-
-  *val=value[0];
-  DBG(DBG_io2, "%s(0x%02x)=0x%02x\n", __func__, reg, *val);
-
-  /* check usb link status */
-  if((value[1] & 0xff) != 0x55)
-    {
-      DBG(DBG_error,"%s: invalid read, scanner unplugged ?\n", __func__);
-      status=SANE_STATUS_IO_ERROR;
-    }
-  return status;
-}
-
-/* Read from one register */
-SANE_Status
-sanei_genesys_read_register (Genesys_Device * dev, uint16_t reg, uint8_t * val)
-{
-    DBG_HELPER(dbg);
-
-  SANE_Byte reg8;
-
-  /* 16 bit register address space */
-  if(reg>255)
-    {
-      return sanei_genesys_read_hregister(dev, reg, val);
-    }
-
-  /* route to gl847 function if needed */
-  if(dev->model->asic_type==GENESYS_GL847
-  || dev->model->asic_type==GENESYS_GL845
-  || dev->model->asic_type==GENESYS_GL846
-  || dev->model->asic_type==GENESYS_GL124)
-    return sanei_genesys_read_gl847_register(dev, reg, val);
-
-  /* 8 bit register address space */
-    reg8=(SANE_Byte)(reg& 0Xff);
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_REGISTER, VALUE_SET_REGISTER, INDEX,
-                             1, &reg8);
-
-  *val = 0;
-
-    dev->usb_dev.control_msg(REQUEST_TYPE_IN, REQUEST_REGISTER, VALUE_READ_REGISTER, INDEX,
-                             1, val);
-
-  DBG(DBG_io, "%s (0x%02x, 0x%02x) completed\n", __func__, reg, *val);
-
-    return SANE_STATUS_GOOD;
-}
-
-/* Set address for writing data */
-SANE_Status
-sanei_genesys_set_buffer_address (Genesys_Device * dev, uint32_t addr)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-
-  if(dev->model->asic_type==GENESYS_GL847
-  || dev->model->asic_type==GENESYS_GL845
-  || dev->model->asic_type==GENESYS_GL846
-  || dev->model->asic_type==GENESYS_GL124)
-    {
-      DBG(DBG_warn, "%s: shouldn't be used for GL846+ ASICs\n", __func__);
-      return SANE_STATUS_GOOD;
-    }
-
-  DBG(DBG_io, "%s: setting address to 0x%05x\n", __func__, addr & 0xfffffff0);
-
-  addr = addr >> 4;
-
-  status = sanei_genesys_write_register (dev, 0x2b, (addr & 0xff));
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: failed while writing low byte: %s\n", __func__, sane_strstatus(status));
-      return status;
-    }
-
-  addr = addr >> 8;
-  status = sanei_genesys_write_register (dev, 0x2a, (addr & 0xff));
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: failed while writing high byte: %s\n", __func__, sane_strstatus(status));
-      return status;
-    }
-
-  DBG(DBG_io, "%s: completed\n", __func__);
-
-  return status;
-}
-
-/**@brief read data from analog frontend (AFE)
- * @param dev device owning the AFE
- * @param addr register address to read
- * @param data placeholder for the result
- * @return SANE_STATUS_GOOD is OK, else the error code
- */
-SANE_Status
-sanei_genesys_fe_read_data (Genesys_Device * dev, uint8_t addr,
-			     uint16_t *data)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t value;
-  Genesys_Register_Set reg;
-
-
-  DBG(DBG_proc, "%s: start\n", __func__);
-
-  reg.init_reg(0x50, addr);
-
-  /* set up read address */
-  status = dev->model->cmd_set->bulk_write_register(dev, reg);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: failed while bulk writing registers: %s\n", __func__,
-          sane_strstatus(status));
-      return status;
-    }
-
-  /* read data */
-  RIE (sanei_genesys_read_register (dev, 0x46, &value));
-  *data=256*value;
-  RIE (sanei_genesys_read_register (dev, 0x47, &value));
-  *data+=value;
-
-  DBG(DBG_io, "%s (0x%02x, 0x%04x)\n", __func__, addr, *data);
-  DBG(DBG_proc, "%s: completed\n", __func__);
-
-  return status;
-}
-
-/*@brief write data to analog frontend
- * writes data to analog frontend to set it up accordingly
- * to the sensor settings (exposure, timings, color, bit depth, ...)
- * @param dev devie owning the AFE to write to
- * @param addr AFE rister address
- * @param data value to write to AFE register
- **/
-SANE_Status
-sanei_genesys_fe_write_data (Genesys_Device * dev, uint8_t addr,
-			     uint16_t data)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  Genesys_Register_Set reg(Genesys_Register_Set::SEQUENTIAL);
-
-  DBG(DBG_io, "%s (0x%02x, 0x%04x)\n", __func__, addr, data);
-
-    reg.init_reg(0x51, addr);
-    if (dev->model->asic_type == GENESYS_GL124) {
-        reg.init_reg(0x5d, (data / 256) & 0xff);
-        reg.init_reg(0x5e, data & 0xff);
-    } else {
-        reg.init_reg(0x3a, (data / 256) & 0xff);
-        reg.init_reg(0x3b, data & 0xff);
-    }
-
-  status = dev->model->cmd_set->bulk_write_register(dev, reg);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: failed while bulk writing registers: %s\n", __func__,
-          sane_strstatus(status));
-      return status;
-    }
-
-  DBG(DBG_io, "%s: completed\n", __func__);
-
-  return status;
-}
-
-/* ------------------------------------------------------------------------ */
-/*                       Medium level functions                             */
-/* ------------------------------------------------------------------------ */
-
-/** read the status register
- */
-SANE_Status
-sanei_genesys_get_status (Genesys_Device * dev, uint8_t * status)
-{
-  if(dev->model->asic_type==GENESYS_GL124)
-    return sanei_genesys_read_hregister(dev, 0x101, status);
-  return sanei_genesys_read_register (dev, 0x41, status);
-}
-
-/**
- * decodes and prints content of status register
- * @param val value read from status register
- */
-void sanei_genesys_print_status (uint8_t val)
-{
-  char msg[80];
-
-  sprintf (msg, "%s%s%s%s%s%s%s%s",
-	   val & PWRBIT ? "PWRBIT " : "",
-	   val & BUFEMPTY ? "BUFEMPTY " : "",
-	   val & FEEDFSH ? "FEEDFSH " : "",
-	   val & SCANFSH ? "SCANFSH " : "",
-	   val & HOMESNR ? "HOMESNR " : "",
-	   val & LAMPSTS ? "LAMPSTS " : "",
-	   val & FEBUSY ? "FEBUSY " : "",
-	   val & MOTORENB ? "MOTORENB" : "");
-  DBG(DBG_info, "status=%s\n", msg);
-}
-
-#if 0
-/* returns pixels per line from register set */
-/*candidate for moving into chip specific files?*/
-static int
-genesys_pixels_per_line (Genesys_Register_Set * reg)
-{
-  int pixels_per_line;
-
-  pixels_per_line =
-    sanei_genesys_read_reg_from_set (reg,
-				     0x32) * 256 +
-    sanei_genesys_read_reg_from_set (reg, 0x33);
-  pixels_per_line -=
-    (sanei_genesys_read_reg_from_set (reg, 0x30) * 256 +
-     sanei_genesys_read_reg_from_set (reg, 0x31));
-
-  return pixels_per_line;
-}
-
-/* returns dpiset from register set */
-/*candidate for moving into chip specific files?*/
-static int
-genesys_dpiset (Genesys_Register_Set * reg)
-{
-  int dpiset;
-
-  dpiset =
-    sanei_genesys_read_reg_from_set (reg,
-				     0x2c) * 256 +
-    sanei_genesys_read_reg_from_set (reg, 0x2d);
-
-  return dpiset;
-}
-#endif
-
-/** read the number of valid words in scanner's RAM
- * ie registers 42-43-44
- */
-/*candidate for moving into chip specific files?*/
-SANE_Status
-sanei_genesys_read_valid_words (Genesys_Device * dev, unsigned int *words)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t value;
-
-  DBGSTART;
-  switch (dev->model->asic_type)
-    {
-    case GENESYS_GL124:
-      RIE (sanei_genesys_read_hregister (dev, 0x102, &value));
-      *words = (value & 0x03);
-      RIE (sanei_genesys_read_hregister (dev, 0x103, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_hregister (dev, 0x104, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_hregister (dev, 0x105, &value));
-      *words = *words * 256 + value;
-      break;
-
-    case GENESYS_GL845:
-    case GENESYS_GL846:
-      RIE (sanei_genesys_read_register (dev, 0x42, &value));
-      *words = (value & 0x02);
-      RIE (sanei_genesys_read_register (dev, 0x43, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_register (dev, 0x44, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_register (dev, 0x45, &value));
-      *words = *words * 256 + value;
-      break;
-
-    case GENESYS_GL847:
-      RIE (sanei_genesys_read_register (dev, 0x42, &value));
-      *words = (value & 0x03);
-      RIE (sanei_genesys_read_register (dev, 0x43, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_register (dev, 0x44, &value));
-      *words = *words * 256 + value;
-      RIE (sanei_genesys_read_register (dev, 0x45, &value));
-      *words = *words * 256 + value;
-      break;
-
-    default:
-      RIE (sanei_genesys_read_register (dev, 0x44, &value));
-      *words = value;
-      RIE (sanei_genesys_read_register (dev, 0x43, &value));
-      *words += (value * 256);
-      RIE (sanei_genesys_read_register (dev, 0x42, &value));
-      if (dev->model->asic_type == GENESYS_GL646)
-	*words += ((value & 0x03) * 256 * 256);
-      else
-	*words += ((value & 0x0f) * 256 * 256);
-    }
-
-  DBG(DBG_proc, "%s: %d words\n", __func__, *words);
-  DBGCOMPLETED;
-  return SANE_STATUS_GOOD;
-}
-
-/** read the number of lines scanned
- * ie registers 4b-4c-4d
- */
-SANE_Status
-sanei_genesys_read_scancnt (Genesys_Device * dev, unsigned int *words)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t value;
-
-  DBG(DBG_proc, "%s: start\n", __func__);
-
-  if (dev->model->asic_type == GENESYS_GL124)
-    {
-      RIE (sanei_genesys_read_hregister (dev, 0x10b, &value));
-      *words = (value & 0x0f) << 16;
-      RIE (sanei_genesys_read_hregister (dev, 0x10c, &value));
-      *words += (value << 8);
-      RIE (sanei_genesys_read_hregister (dev, 0x10d, &value));
-      *words += value;
-    }
-  else
-    {
-      RIE (sanei_genesys_read_register (dev, 0x4d, &value));
-      *words = value;
-      RIE (sanei_genesys_read_register (dev, 0x4c, &value));
-      *words += (value * 256);
-      RIE (sanei_genesys_read_register (dev, 0x4b, &value));
-      if (dev->model->asic_type == GENESYS_GL646)
-        *words += ((value & 0x03) * 256 * 256);
-      else
-        *words += ((value & 0x0f) * 256 * 256);
-    }
-
-  DBG(DBG_proc, "%s: %d lines\n", __func__, *words);
-  return SANE_STATUS_GOOD;
-}
-
-/** @brief Check if the scanner's internal data buffer is empty
- * @param *dev device to test for data
- * @param *empty return value
- * @return empty will be set to SANE_TRUE if there is no scanned data.
- **/
-SANE_Status
-sanei_genesys_test_buffer_empty (Genesys_Device * dev, SANE_Bool * empty)
-{
-  uint8_t val = 0;
-  SANE_Status status = SANE_STATUS_GOOD;
-
-  sanei_genesys_sleep_ms(1);
-  status = sanei_genesys_get_status (dev, &val);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: failed to read buffer status: %s\n", __func__, sane_strstatus(status));
-      return status;
-    }
-
-  if (dev->model->cmd_set->test_buffer_empty_bit (val))
-    {
-      /* fix timing issue on USB3 (or just may be too fast) hardware
-       * spotted by John S. Weber <jweber53@gmail.com>
-       */
-      sanei_genesys_sleep_ms(1);
-      DBG(DBG_io2, "%s: buffer is empty\n", __func__);
-      *empty = SANE_TRUE;
-      return SANE_STATUS_GOOD;
-    }
-
-  *empty = SANE_FALSE;
-
-  DBG(DBG_io, "%s: buffer is filled\n", __func__);
-  return SANE_STATUS_GOOD;
-}
-
-
-/* Read data (e.g scanned image) from scan buffer */
-SANE_Status
-sanei_genesys_read_data_from_scanner (Genesys_Device * dev, uint8_t * data,
-				      size_t size)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  int time_count = 0;
-  unsigned int words = 0;
-
-  DBG(DBG_proc, "%s (size = %lu bytes)\n", __func__, (u_long) size);
-
-  if (size & 1)
-    DBG(DBG_info, "WARNING %s: odd number of bytes\n", __func__);
-
-  /* wait until buffer not empty for up to 5 seconds */
-  do
-    {
-      status = sanei_genesys_read_valid_words (dev, &words);
-      if (status != SANE_STATUS_GOOD)
-	{
-	  DBG(DBG_error, "%s: checking for empty buffer failed: %s\n", __func__,
-	      sane_strstatus(status));
-	  return status;
-	}
-      if (words == 0)
-	{
-          sanei_genesys_sleep_ms(10);
-	  time_count++;
-	}
-    }
-  while ((time_count < 2500*2) && (words == 0));
-
-  if (words == 0)		/* timeout, buffer does not get filled */
-    {
-      DBG(DBG_error, "%s: timeout, buffer does not get filled\n", __func__);
-      return SANE_STATUS_IO_ERROR;
-    }
-
-  status = dev->model->cmd_set->bulk_read_data (dev, 0x45, data, size);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG(DBG_error, "%s: reading bulk data failed: %s\n", __func__, sane_strstatus(status));
-      return status;
-    }
-
-  DBG(DBG_proc, "%s: completed\n", __func__);
-  return SANE_STATUS_GOOD;
-}
-SANE_Status
-sanei_genesys_read_feed_steps (Genesys_Device * dev, unsigned int *steps)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t value;
-
-  DBG(DBG_proc, "%s\n", __func__);
-
-  if (dev->model->asic_type == GENESYS_GL124)
-    {
-      RIE (sanei_genesys_read_hregister (dev, 0x108, &value));
-      *steps = (value & 0x1f) << 16;
-      RIE (sanei_genesys_read_hregister (dev, 0x109, &value));
-      *steps += (value << 8);
-      RIE (sanei_genesys_read_hregister (dev, 0x10a, &value));
-      *steps += value;
-    }
-  else
-    {
-      RIE (sanei_genesys_read_register (dev, 0x4a, &value));
-      *steps = value;
-      RIE (sanei_genesys_read_register (dev, 0x49, &value));
-      *steps += (value * 256);
-      RIE (sanei_genesys_read_register (dev, 0x48, &value));
-      if (dev->model->asic_type == GENESYS_GL646)
-        *steps += ((value & 0x03) * 256 * 256);
-      else if (dev->model->asic_type == GENESYS_GL841)
-        *steps += ((value & 0x0f) * 256 * 256);
-      else
-        *steps += ((value & 0x1f) * 256 * 256);
-    }
-
-  DBG(DBG_proc, "%s: %d steps\n", __func__, *steps);
-  return SANE_STATUS_GOOD;
-}
-
-void sanei_genesys_set_lamp_power(Genesys_Device* dev, const Genesys_Sensor& sensor,
-                                  Genesys_Register_Set& regs, bool set)
-{
-    static const uint8_t REG03_LAMPPWR = 0x10;
-
-    if (set) {
-        regs.find_reg(0x03).value |= REG03_LAMPPWR;
-
-        if (dev->model->asic_type == GENESYS_GL841) {
-            sanei_genesys_set_exposure(regs, sanei_genesys_fixup_exposure(sensor.exposure));
-            regs.set8(0x19, 0x50);
-        }
-
-        if (dev->model->asic_type == GENESYS_GL843) {
-            sanei_genesys_set_exposure(regs, sensor.exposure);
-        }
-    } else {
-        regs.find_reg(0x03).value &= ~REG03_LAMPPWR;
-
-        if (dev->model->asic_type == GENESYS_GL841) {
-            sanei_genesys_set_exposure(regs, {0x0101, 0x0101, 0x0101});
-            regs.set8(0x19, 0xff);
-        }
-
-        if (dev->model->asic_type == GENESYS_GL843) {
-            if (dev->model->model_id != MODEL_CANON_CANOSCAN_8600F) {
-                // BUG: datasheet says we shouldn't set exposure to zero
-                sanei_genesys_set_exposure(regs, {0, 0, 0});
-            }
-        }
-    }
-    regs.state.is_lamp_on = set;
-}
-
-void sanei_genesys_set_motor_power(Genesys_Register_Set& regs, bool set)
-{
-    static const uint8_t REG02_MTRPWR = 0x10;
-
-    if (set) {
-        regs.find_reg(0x02).value |= REG02_MTRPWR;
-    } else {
-        regs.find_reg(0x02).value &= ~REG02_MTRPWR;
-    }
-}
-
-/**
- * Write to many registers at once
- * Note: sequential call to write register, no effective
- * bulk write implemented.
- * @param dev device to write to
- * @param reg pointer to an array of registers
- * @param elems size of the array
- */
-SANE_Status sanei_genesys_bulk_write_register(Genesys_Device * dev, Genesys_Register_Set& reg)
-{
-    DBG_HELPER(dbg);
-
-    SANE_Status status = SANE_STATUS_GOOD;
-
-    if (dev->model->asic_type == GENESYS_GL646 ||
-        dev->model->asic_type == GENESYS_GL841)
-    {
-        uint8_t outdata[8];
-        std::vector<uint8_t> buffer;
-        buffer.reserve(reg.size() * 2);
-
-        /* copy registers and values in data buffer */
-        for (const auto& r : reg) {
-            buffer.push_back(r.address);
-            buffer.push_back(r.value);
-        }
-
-        DBG(DBG_io, "%s (elems= %lu, size = %lu)\n", __func__, (u_long) reg.size(),
-            (u_long) buffer.size());
-
-        if (dev->model->asic_type == GENESYS_GL646) {
-            outdata[0] = BULK_OUT;
-            outdata[1] = BULK_REGISTER;
-            outdata[2] = 0x00;
-            outdata[3] = 0x00;
-            outdata[4] = (buffer.size() & 0xff);
-            outdata[5] = ((buffer.size() >> 8) & 0xff);
-            outdata[6] = ((buffer.size() >> 16) & 0xff);
-            outdata[7] = ((buffer.size() >> 24) & 0xff);
-
-            dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_BUFFER, INDEX,
-                                     sizeof(outdata), outdata);
-
-            size_t write_size = buffer.size();
-
-            dev->usb_dev.bulk_write(buffer.data(), &write_size);
-        } else {
-            for (size_t i = 0; i < reg.size();) {
-                size_t c = reg.size() - i;
-                if (c > 32)  /*32 is max on GL841. checked that.*/
-                    c = 32;
-
-                dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_SET_REGISTER,
-                                         INDEX, c * 2, buffer.data() + i * 2);
-
-                i += c;
-            }
-        }
-    } else {
-        for (const auto& r : reg) {
-            status = sanei_genesys_write_register (dev, r.address, r.value);
-            if (status != SANE_STATUS_GOOD)
-                return status;
-        }
-    }
-
-    DBG (DBG_io, "%s: wrote %lu registers\n", __func__, (u_long) reg.size());
-    return status;
-}
-
-
-
-/**
- * writes a block of data to AHB
- * @param dn USB device index
- * @param usb_mode usb mode : 1 usb 1.1, 2 usb 2.0
- * @param addr AHB address to write to
- * @param size size of the chunk of data
- * @param data pointer to the data to write
- */
-SANE_Status
-sanei_genesys_write_ahb(Genesys_Device* dev, uint32_t addr, uint32_t size, uint8_t * data)
-{
-    DBG_HELPER(dbg);
-
-  uint8_t outdata[8];
-  size_t written,blksize;
-  SANE_Status status = SANE_STATUS_GOOD;
-  int i;
-  char msg[100]="AHB=";
-
-  outdata[0] = addr & 0xff;
-  outdata[1] = ((addr >> 8) & 0xff);
-  outdata[2] = ((addr >> 16) & 0xff);
-  outdata[3] = ((addr >> 24) & 0xff);
-  outdata[4] = (size & 0xff);
-  outdata[5] = ((size >> 8) & 0xff);
-  outdata[6] = ((size >> 16) & 0xff);
-  outdata[7] = ((size >> 24) & 0xff);
-
-  if (DBG_LEVEL >= DBG_io)
-    {
-      for (i = 0; i < 8; i++)
-	{
-          sprintf (msg+strlen(msg), " 0x%02x", outdata[i]);
-	}
-      DBG (DBG_io, "%s: write(0x%08x,0x%08x)\n", __func__, addr,size);
-      DBG (DBG_io, "%s: %s\n", __func__, msg);
-    }
-
-    // write addr and size for AHB
-    dev->usb_dev.control_msg(REQUEST_TYPE_OUT, REQUEST_BUFFER, VALUE_BUFFER, 0x01, 8, outdata);
-
-  size_t max_out_size = sanei_genesys_get_bulk_max_size(dev);
-
-  /* write actual data */
-  written = 0;
-  do
-    {
-      if (size - written > max_out_size)
-        {
-          blksize = max_out_size;
-        }
-      else
-        {
-          blksize = size - written;
-        }
-        dev->usb_dev.bulk_write(data + written, &blksize);
-
-      written += blksize;
-    }
-  while (written < size);
-
-  return status;
-}
-
-
-std::vector<uint16_t> get_gamma_table(Genesys_Device* dev, const Genesys_Sensor& sensor,
-                                      int color)
-{
-    if (!dev->gamma_override_tables[color].empty()) {
-        return dev->gamma_override_tables[color];
-    } else {
-        std::vector<uint16_t> ret;
-        sanei_genesys_create_default_gamma_table(dev, ret, sensor.gamma[color]);
-        return ret;
-    }
-}
-
-/** @brief generates gamma buffer to transfer
- * Generates gamma table buffer to send to ASIC. Applies
- * contrast and brightness if set.
- * @param dev device to set up
- * @param bits number of bits used by gamma
- * @param max value for gamma
- * @param size of the gamma table
- * @param gamma allocated gamma buffer to fill
- * @returns SANE_STATUS_GOOD or SANE_STATUS_NO_MEM
- */
-SANE_Status sanei_genesys_generate_gamma_buffer(Genesys_Device * dev,
-                                                const Genesys_Sensor& sensor,
-                                                int bits,
-                                                int max,
-                                                int size,
-                                                uint8_t *gamma)
-{
-    std::vector<uint16_t> rgamma = get_gamma_table(dev, sensor, GENESYS_RED);
-    std::vector<uint16_t> ggamma = get_gamma_table(dev, sensor, GENESYS_GREEN);
-    std::vector<uint16_t> bgamma = get_gamma_table(dev, sensor, GENESYS_BLUE);
-
-  if(dev->settings.contrast!=0 || dev->settings.brightness!=0)
-    {
-      std::vector<uint16_t> lut(65536);
-      sanei_genesys_load_lut((unsigned char *)lut.data(),
-                             bits,
-                             bits,
-                             0,
-                             max,
-                             dev->settings.contrast,
-                             dev->settings.brightness);
-      for (int i = 0; i < size; i++)
-        {
-          uint16_t value=rgamma[i];
-          value=lut[value];
-          gamma[i * 2 + size * 0 + 0] = value & 0xff;
-          gamma[i * 2 + size * 0 + 1] = (value >> 8) & 0xff;
-
-          value=ggamma[i];
-          value=lut[value];
-          gamma[i * 2 + size * 2 + 0] = value & 0xff;
-          gamma[i * 2 + size * 2 + 1] = (value >> 8) & 0xff;
-
-          value=bgamma[i];
-          value=lut[value];
-          gamma[i * 2 + size * 4 + 0] = value & 0xff;
-          gamma[i * 2 + size * 4 + 1] = (value >> 8) & 0xff;
-        }
-    }
-  else
-    {
-      for (int i = 0; i < size; i++)
-        {
-          uint16_t value=rgamma[i];
-          gamma[i * 2 + size * 0 + 0] = value & 0xff;
-          gamma[i * 2 + size * 0 + 1] = (value >> 8) & 0xff;
-
-          value=ggamma[i];
-          gamma[i * 2 + size * 2 + 0] = value & 0xff;
-          gamma[i * 2 + size * 2 + 1] = (value >> 8) & 0xff;
-
-          value=bgamma[i];
-          gamma[i * 2 + size * 4 + 0] = value & 0xff;
-          gamma[i * 2 + size * 4 + 1] = (value >> 8) & 0xff;
-        }
-    }
-
-  return SANE_STATUS_GOOD;
-}
-
-
-/** @brief send gamma table to scanner
- * This function sends generic gamma table (ie ones built with
- * provided gamma) or the user defined one if provided by
- * fontend. Used by gl846+ ASICs
- * @param dev device to write to
- */
-SANE_Status
-sanei_genesys_send_gamma_table(Genesys_Device * dev, const Genesys_Sensor& sensor)
-{
-  int size;
-  int i;
-  uint8_t val;
-  SANE_Status status = SANE_STATUS_GOOD;
-
-  DBGSTART;
-
-  size = 256 + 1;
-
-  /* allocate temporary gamma tables: 16 bits words, 3 channels */
-  std::vector<uint8_t> gamma(size * 2 * 3, 255);
-
-  RIE(sanei_genesys_generate_gamma_buffer(dev, sensor, 16, 65535, size, gamma.data()));
-
-  /* loop sending gamma tables NOTE: 0x01000000 not 0x10000000 */
-  for (i = 0; i < 3; i++)
-    {
-      /* clear corresponding GMM_N bit */
-      RIE(sanei_genesys_read_register(dev, 0xbd, &val));
-      val &= ~(0x01 << i);
-      RIE(sanei_genesys_write_register(dev, 0xbd, val));
-
-      /* clear corresponding GMM_F bit */
-      RIE(sanei_genesys_read_register(dev, 0xbe, &val));
-      val &= ~(0x01 << i);
-      RIE(sanei_genesys_write_register(dev, 0xbe, val));
-
-      // FIXME: currently the last word of each gamma table is not initialied, so to work around
-      // unstable data, just set it to 0 which is the most likely value of uninitialized memory
-      // (proper value is probably 0xff)
-      gamma[size * 2 * i + size * 2 - 2] = 0;
-      gamma[size * 2 * i + size * 2 - 1] = 0;
-
-      /* set GMM_Z */
-      RIE(sanei_genesys_write_register (dev, 0xc5+2*i, gamma[size*2*i+1]));
-      RIE(sanei_genesys_write_register (dev, 0xc6+2*i, gamma[size*2*i]));
-
-      status = sanei_genesys_write_ahb(dev, 0x01000000 + 0x200 * i, (size-1) * 2, gamma.data() + i * size * 2+2);
-      if (status != SANE_STATUS_GOOD)
-	{
-	  DBG (DBG_error,
-	       "%s: write to AHB failed writing table %d (%s)\n", __func__,
-	       i, sane_strstatus (status));
-          break;
-	}
-    }
-
-  DBGCOMPLETED;
-  return status;
-}
-
-/** @brief initialize device
- * Initialize backend and ASIC : registers, motor tables, and gamma tables
- * then ensure scanner's head is at home. Designed for gl846+ ASICs.
- * Detects cold boot (ie first boot since device plugged) in this case
- * an extensice setup up is done at hardware level.
- *
- * @param dev device to initialize
- * @param max_regs umber of maximum used registers
- * @return SANE_STATUS_GOOD in case of success
- */
-SANE_Status
-sanei_genesys_asic_init(Genesys_Device* dev, int /*max_regs*/)
-{
-    DBG_HELPER(dbg);
-
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t val;
-  SANE_Bool cold = SANE_TRUE;
-
-  DBGSTART;
-
-    // URB    16  control  0xc0 0x0c 0x8e 0x0b len     1 read  0x00 */
-    dev->usb_dev.control_msg(REQUEST_TYPE_IN, REQUEST_REGISTER, VALUE_GET_REGISTER, 0x00, 1, &val);
-
-  DBG (DBG_io2, "%s: value=0x%02x\n", __func__, val);
-  DBG (DBG_info, "%s: device is %s\n", __func__, (val & 0x08) ? "USB 1.0" : "USB2.0");
-  if (val & 0x08)
-    {
-      dev->usb_mode = 1;
-    }
-  else
-    {
-      dev->usb_mode = 2;
-    }
-
-  /* check if the device has already been initialized and powered up
-   * we read register 6 and check PWRBIT, if reset scanner has been
-   * freshly powered up. This bit will be set to later so that following
-   * reads can detect power down/up cycle*/
-  RIE (sanei_genesys_read_register (dev, 0x06, &val));
-  /* test for POWER bit */
-  if (val & 0x10)
-    {
-      cold = SANE_FALSE;
-    }
-  DBG (DBG_info, "%s: device is %s\n", __func__, cold ? "cold" : "warm");
-
-  /* don't do anything if backend is initialized and hardware hasn't been
-   * replug */
-  if (dev->already_initialized && !cold)
-    {
-      DBG (DBG_info, "%s: already initialized, nothing to do\n", __func__);
-      return SANE_STATUS_GOOD;
-    }
-
-  /* set up hardware and registers */
-  RIE (dev->model->cmd_set->asic_boot (dev, cold));
-
-  /* now hardware part is OK, set up device struct */
-  dev->white_average_data.clear();
-  dev->dark_average_data.clear();
-
-  dev->settings.color_filter = ColorFilter::RED;
-
-  /* duplicate initial values into calibration registers */
-  dev->calib_reg = dev->reg;
-
-  const auto& sensor = sanei_genesys_find_sensor_any(dev);
-
-  /* Set analog frontend */
-  RIE (dev->model->cmd_set->set_fe(dev, sensor, AFE_INIT));
-
-  dev->already_initialized = SANE_TRUE;
-
-  /* Move to home if needed */
-  RIE (dev->model->cmd_set->slow_back_home (dev, SANE_TRUE));
-  dev->scanhead_position_in_steps = 0;
-
-  /* Set powersaving (default = 15 minutes) */
-  RIE (dev->model->cmd_set->set_powersaving (dev, 15));
-
-    return status;
-}
-
-/**
- * Wait for the scanning head to park
- */
-SANE_Status
-sanei_genesys_wait_for_home (Genesys_Device * dev)
-{
-  SANE_Status status = SANE_STATUS_GOOD;
-  uint8_t val;
-  int loop;
-  int max=300;
-
-  DBGSTART;
-
-  /* clear the parking status whatever the outcome of the function */
-  dev->parking=SANE_FALSE;
-
-  /* read initial status, if head isn't at home and motor is on
-   * we are parking, so we wait.
-   * gl847/gl124 need 2 reads for reliable results */
-  status = sanei_genesys_get_status (dev, &val);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG (DBG_error,
-	   "%s: failed to read home sensor: %s\n", __func__,
-	   sane_strstatus (status));
-      return status;
-    }
-  sanei_genesys_sleep_ms(10);
-  status = sanei_genesys_get_status (dev, &val);
-  if (status != SANE_STATUS_GOOD)
-    {
-      DBG (DBG_error,
-	   "%s: failed to read home sensor: %s\n", __func__,
-	   sane_strstatus (status));
-      return status;
-    }
-
-  /* if at home, return */
-  if(val & HOMESNR)
-    {
-	  DBG (DBG_info,
-	       "%s: already at home\n", __func__);
-	  return status;
-    }
-
-  /* loop for 30 s max, polling home sensor */
-  loop = 0;
-  do
-    {
-      sanei_genesys_sleep_ms(100);
-      status = sanei_genesys_get_status (dev, &val);
-      if (status != SANE_STATUS_GOOD)
-	{
-	  DBG (DBG_error,
-	       "%s: failed to read home sensor: %s\n", __func__,
-	       sane_strstatus (status));
-	  return status;
-	}
-          if (DBG_LEVEL >= DBG_io2)
-            {
-              sanei_genesys_print_status (val);
-            }
-      ++loop;
-    }
-  while (loop < max && !(val & HOMESNR) && status == SANE_STATUS_GOOD);
-
-  /* if after the timeout, head is still not parked, error out */
-  if(loop >= max && !(val & HOMESNR) && status == SANE_STATUS_GOOD)
-    {
-      DBG (DBG_error, "%s: failed to reach park position %ds\n", __func__, max/10);
-      return SANE_STATUS_IO_ERROR;
-    }
-
-  DBGCOMPLETED;
-  return status;
-}
-
-/**@brief compute hardware sensor dpi to use
- * compute the sensor hardware dpi based on target resolution.
- * A lower dpihw enable faster scans.
- * @param dev device used for the scan
- * @param xres x resolution of the scan
- * @return the hardware dpi to use
- */
-int sanei_genesys_compute_dpihw(Genesys_Device *dev, const Genesys_Sensor& sensor, int xres)
-{
-  /* some scanners use always hardware dpi for sensor */
-  if (dev->model->flags & GENESYS_FLAG_FULL_HWDPI_MODE)
-    {
-      return sensor.optical_res;
-    }
-
-  /* can't be below 600 dpi */
-  if (xres <= 600)
-    {
-      return 600;
-    }
-  if (xres <= sensor.optical_res / 4)
-    {
-      return sensor.optical_res / 4;
-    }
-  if (xres <= sensor.optical_res / 2)
-    {
-      return sensor.optical_res / 2;
-    }
-  return sensor.optical_res;
-}
-
-// sanei_genesys_compute_dpihw returns the dpihw that is written to register.
-// However the number of pixels depends on half_ccd mode
-int sanei_genesys_compute_dpihw_calibration(Genesys_Device *dev, const Genesys_Sensor& sensor,
-                                            int xres)
-{
-  if (dev->model->model_id == MODEL_CANON_CANOSCAN_8600F)
-    {
-      // real resolution is half of the "official" resolution - half_ccd mode
-      int hwres = sensor.optical_res / sensor.get_ccd_size_divisor_for_dpi(xres);
-
-      if (xres <= hwres / 4)
-        {
-          return hwres / 4;
-        }
-      if (xres <= hwres / 2)
-        {
-          return hwres / 2;
-        }
-      return hwres;
-    }
-
-  return sanei_genesys_compute_dpihw(dev, sensor, xres);
-}
-
-/** @brief motor profile
- * search for the database of motor profiles and get the best one. Each
- * profile is at full step and at a reference exposure. Use first entry
- * by default.
- * @param motors motor profile database
- * @param motor_type motor id
- * @param exposure exposure time
- * @return a pointer to a Motor_Profile struct
- */
-Motor_Profile *sanei_genesys_get_motor_profile(Motor_Profile *motors, int motor_type, int exposure)
-{
-  unsigned int i;
-  int idx;
-
-  i=0;
-  idx=-1;
-  while(motors[i].exposure!=0)
-    {
-      /* exact match */
-      if(motors[i].motor_type==motor_type && motors[i].exposure==exposure)
-        {
-          return &(motors[i]);
-        }
-
-      /* closest match */
-      if(motors[i].motor_type==motor_type)
-        {
-          /* if profile exposure is higher than the required one,
-           * the entry is a candidate for the closest match */
-          if(motors[i].exposure>=exposure)
-            {
-              if(idx<0)
-                {
-                  /* no match found yet */
-                  idx=i;
-                }
-              else
-                {
-                  /* test for better match */
-                  if(motors[i].exposure<motors[idx].exposure)
-                    {
-                      idx=i;
-                    }
-                }
-            }
-        }
-      i++;
-    }
-
-  /* default fallback */
-  if(idx<0)
-    {
-      DBG (DBG_warn,"%s: using default motor profile\n",__func__);
-      idx=0;
-    }
-
-  return &(motors[idx]);
-}
-
-/**@brief compute motor step type to use
- * compute the step type (full, half, quarter, ...) to use based
- * on target resolution
- * @param motors motor profile database
- * @param motor_type motor id
- * @param exposure sensor exposure
- * @return 0 for full step
- *         1 for half step
- *         2 for quarter step
- *         3 for eighth step
- */
-int sanei_genesys_compute_step_type(Motor_Profile *motors,
-                                    int motor_type,
-                                    int exposure)
-{
-Motor_Profile *profile;
-
-    profile=sanei_genesys_get_motor_profile(motors, motor_type, exposure);
-    return profile->step_type;
-}
-
-/** @brief generate slope table
- * Generate the slope table to use for the scan using a reference slope
- * table.
- * @param slope pointer to the slope table to fill
- * @param steps pointer to return used step number
- * @param dpi   desired motor resolution
- * @param exposure exposure used
- * @param base_dpi base resolution of the motor
- * @param step_type step type used for scan
- * @param factor shrink factor for the slope
- * @param motor_type motor id
- * @param motors motor profile database
- */
-int sanei_genesys_slope_table(uint16_t *slope,
-		             int       *steps,
-			     int       dpi,
-			     int       exposure,
-			     int       base_dpi,
-			     int       step_type,
-			     int       factor,
-                             int       motor_type,
-                             Motor_Profile *motors)
-{
-int sum, i;
-uint16_t target,current;
-Motor_Profile *profile;
-
-	/* required speed */
-	target=((exposure * dpi) / base_dpi)>>step_type;
-        DBG (DBG_io2, "%s: exposure=%d, dpi=%d, target=%d\n", __func__, exposure, dpi, target);
-
-	/* fill result with target speed */
-        for(i=0;i<SLOPE_TABLE_SIZE;i++)
-          slope[i]=target;
-
-        profile=sanei_genesys_get_motor_profile(motors, motor_type, exposure);
-
-	/* use profile to build table */
-        i=0;
-	sum=0;
-
-        /* first step is always used unmodified */
-        current=profile->table[0];
-
-        /* loop on profile copying and apply step type */
-        while(profile->table[i]!=0 && current>=target)
-          {
-            slope[i]=current;
-            sum+=slope[i];
-            i++;
-            current=profile->table[i]>>step_type;
-          }
-
-        /* ensure last step is required speed in case profile doesn't contain it */
-        if(current!=0 && current<target)
-          {
-            slope[i]=target;
-            sum+=slope[i];
-            i++;
-          }
-
-        /* range checking */
-        if(profile->table[i]==0 && DBG_LEVEL >= DBG_warn && current>target)
-          {
-            DBG (DBG_warn,"%s: short slope table, failed to reach %d. target too low ?\n",__func__,target);
-          }
-        if(i<3 && DBG_LEVEL >= DBG_warn)
-          {
-            DBG (DBG_warn,"%s: short slope table, failed to reach %d. target too high ?\n",__func__,target);
-          }
-
-        /* align on factor */
-        while(i%factor!=0)
-          {
-            slope[i+1]=slope[i];
-            sum+=slope[i];
-            i++;
-          }
-
-        /* ensure minimal slope size */
-        while(i<2*factor)
-          {
-            slope[i+1]=slope[i];
-            sum+=slope[i];
-            i++;
-          }
-
-        // return used steps and taken time
-        *steps=i/factor;
-	return sum;
-}
-
-/** @brief returns the lowest possible ydpi for the device
- * Parses device entry to find lowest motor dpi.
- * @param dev device description
- * @return lowest motor resolution
- */
-int sanei_genesys_get_lowest_ydpi(Genesys_Device *dev)
-{
-  int min=20000;
-  int i=0;
-
-  while(dev->model->ydpi_values[i]!=0)
-    {
-      if(dev->model->ydpi_values[i]<min)
-        {
-          min=dev->model->ydpi_values[i];
-        }
-      i++;
-    }
-  return min;
-}
-
-/** @brief returns the lowest possible dpi for the device
- * Parses device entry to find lowest motor or sensor dpi.
- * @param dev device description
- * @return lowest motor resolution
- */
-int sanei_genesys_get_lowest_dpi(Genesys_Device *dev)
-{
-  int min=20000;
-  int i=0;
-
-  while(dev->model->ydpi_values[i]!=0)
-    {
-      if(dev->model->ydpi_values[i]<min)
-        {
-          min=dev->model->ydpi_values[i];
-        }
-      i++;
-    }
-  i=0;
-  while(dev->model->xdpi_values[i]!=0)
-    {
-      if(dev->model->xdpi_values[i]<min)
-        {
-          min=dev->model->xdpi_values[i];
-        }
-      i++;
-    }
-  return min;
-}
-
-/** @brief check is a cache entry may be used
- * Compares current settings with the cache entry and return
- * SANE_TRUE if they are compatible.
- * A calibration cache is compatible if color mode and x dpi match the user
- * requested scan. In the case of CIS scanners, dpi isn't a criteria.
- * flatbed cache entries are considred too old and then expires if they
- * are older than the expiration time option, forcing calibration at least once
- * then given time. */
-bool sanei_genesys_is_compatible_calibration(Genesys_Device * dev, const Genesys_Sensor& sensor,
-                                             Genesys_Calibration_Cache * cache, int for_overwrite)
-{
-#ifdef HAVE_SYS_TIME_H
-  struct timeval time;
-#endif
-  int compatible = 1, resolution;
-
-  DBGSTART;
-
-  if(dev->model->cmd_set->calculate_current_setup==NULL)
-    {
-      DBG (DBG_proc, "%s: no calculate_setup, non compatible cache\n", __func__);
-      return false;
-    }
-
-    dev->model->cmd_set->calculate_current_setup(dev, sensor);
-
-  DBG (DBG_proc, "%s: checking\n", __func__);
-
-  /* a calibration cache is compatible if color mode and x dpi match the user
-   * requested scan. In the case of CIS scanners, dpi isn't a criteria */
-  if (dev->model->is_cis == SANE_FALSE)
-    {
-      resolution = dev->settings.xres;
-      if(resolution>sensor.optical_res)
-        {
-          resolution=sensor.optical_res;
-        }
-      compatible = (resolution == ((int) cache->used_setup.xres));
-    }
-  else
-    {
-      resolution=sanei_genesys_compute_dpihw(dev, sensor, dev->settings.xres);
-      compatible = (resolution == ((int) sanei_genesys_compute_dpihw(dev, sensor,cache->used_setup.xres)));
-    }
-  DBG (DBG_io, "%s: after resolution check current compatible=%d\n", __func__, compatible);
-  if (dev->current_setup.ccd_size_divisor != cache->used_setup.ccd_size_divisor)
-    {
-      DBG (DBG_io, "%s: half_ccd=%d, used=%d\n", __func__,
-           dev->current_setup.ccd_size_divisor, cache->used_setup.ccd_size_divisor);
-      compatible = 0;
-    }
-  if (dev->current_setup.params.scan_method != cache->used_setup.params.scan_method)
-    {
-      DBG (DBG_io, "%s: current method=%d, used=%d\n", __func__,
-           static_cast<unsigned>(dev->current_setup.params.scan_method),
-           static_cast<unsigned>(cache->used_setup.params.scan_method));
-      compatible = 0;
-    }
-  if (!compatible)
-    {
-      DBG (DBG_proc, "%s: completed, non compatible cache\n", __func__);
-      return false;
-    }
-
-  /* a cache entry expires after afetr expiration time for non sheetfed scanners */
-  /* this is not taken into account when overwriting cache entries    */
-#ifdef HAVE_SYS_TIME_H
-  if(for_overwrite == SANE_FALSE && dev->settings.expiration_time >=0)
-    {
-      gettimeofday (&time, NULL);
-      if ((time.tv_sec - cache->last_calibration > dev->settings.expiration_time*60)
-          && (dev->model->is_sheetfed == SANE_FALSE)
-          && (dev->settings.scan_method == ScanMethod::FLATBED))
-        {
-          DBG (DBG_proc, "%s: expired entry, non compatible cache\n", __func__);
-          return false;
-        }
-    }
-#endif
-
-  DBGCOMPLETED;
-  return true;
-}
-
-
-/** @brief compute maximum line distance shift
- * compute maximum line distance shift for the motor and sensor
- * combination. Line distance shift is the distance between different
- * color component of CCD sensors. Since these components aren't at
- * the same physical place, they scan diffrent lines. Software must
- * take this into account to accurately mix color data.
- * @param dev device session to compute max_shift for
- * @param channels number of color channels for the scan
- * @param yres motor resolution used for the scan
- * @param flags scan flags
- * @return 0 or line distance shift
- */
-int sanei_genesys_compute_max_shift(Genesys_Device *dev,
-                                    int channels,
-                                    int yres,
-                                    int flags)
-{
-  int max_shift;
-
-  max_shift=0;
-  if (channels > 1 && !(flags & SCAN_FLAG_IGNORE_LINE_DISTANCE))
-    {
-      max_shift = dev->ld_shift_r;
-      if (dev->ld_shift_b > max_shift)
-	max_shift = dev->ld_shift_b;
-      if (dev->ld_shift_g > max_shift)
-	max_shift = dev->ld_shift_g;
-      max_shift = (max_shift * yres) / dev->motor.base_ydpi;
-    }
-  return max_shift;
-}
-
-/** @brief build lookup table for digital enhancements
- * Function to build a lookup table (LUT), often
-   used by scanners to implement brightness/contrast/gamma
-   or by backends to speed binarization/thresholding
-
-   offset and slope inputs are -127 to +127
-
-   slope rotates line around central input/output val,
-   0 makes horizontal line
-
-       pos           zero          neg
-       .       x     .             .  x
-       .      x      .             .   x
-   out .     x       .xxxxxxxxxxx  .    x
-       .    x        .             .     x
-       ....x.......  ............  .......x....
-            in            in            in
-
-   offset moves line vertically, and clamps to output range
-   0 keeps the line crossing the center of the table
-
-       high           low
-       .   xxxxxxxx   .
-       . x            .
-   out x              .          x
-       .              .        x
-       ............   xxxxxxxx....
-            in             in
-
-   out_min/max provide bounds on output values,
-   useful when building thresholding lut.
-   0 and 255 are good defaults otherwise.
-  * @param lut pointer where to store the generated lut
-  * @param in_bits number of bits for in values
-  * @param out_bits number of bits of out values
-  * @param out_min minimal out value
-  * @param out_max maximal out value
-  * @param slope slope of the generated data
-  * @param offset offset of the generated data
-  */
-SANE_Status
-sanei_genesys_load_lut (unsigned char * lut,
-                        int in_bits,
-                        int out_bits,
-                        int out_min,
-                        int out_max,
-                        int slope,
-                        int offset)
-{
-  SANE_Status ret = SANE_STATUS_GOOD;
-  int i, j;
-  double shift, rise;
-  int max_in_val = (1 << in_bits) - 1;
-  int max_out_val = (1 << out_bits) - 1;
-  uint8_t *lut_p8 = lut;
-  uint16_t *lut_p16 = (uint16_t *) lut;
-
-  DBGSTART;
-
-  /* slope is converted to rise per unit run:
-   * first [-127,127] to [-.999,.999]
-   * then to [-PI/4,PI/4] then [0,PI/2]
-   * then take the tangent (T.O.A)
-   * then multiply by the normal linear slope
-   * because the table may not be square, i.e. 1024x256*/
-  rise = tan ((double) slope / 128 * M_PI_4 + M_PI_4) * max_out_val / max_in_val;
-
-  /* line must stay vertically centered, so figure
-   * out vertical offset at central input value */
-  shift = (double) max_out_val / 2 - (rise * max_in_val / 2);
-
-  /* convert the user offset setting to scale of output
-   * first [-127,127] to [-1,1]
-   * then to [-max_out_val/2,max_out_val/2]*/
-  shift += (double) offset / 127 * max_out_val / 2;
-
-  for (i = 0; i <= max_in_val; i++)
-    {
-      j = rise * i + shift;
-
-      /* cap data to required range */
-      if (j < out_min)
-	{
-	  j = out_min;
-	}
-      else if (j > out_max)
-	{
-	  j = out_max;
-	}
-
-      /* copy result according to bit depth */
-      if (out_bits <= 8)
-	{
-	  *lut_p8 = j;
-	  lut_p8++;
-	}
-      else
-	{
-	  *lut_p16 = j;
-	  lut_p16++;
-	}
-    }
-
-  DBGCOMPLETED;
-  return ret;
-}
-
-void sanei_genesys_usleep(unsigned int useconds)
-{
-  usleep(useconds);
-}
-
-void sanei_genesys_sleep_ms(unsigned int milliseconds)
-{
-  sanei_genesys_usleep(milliseconds * 1000);
-}
-
-static std::unique_ptr<std::vector<std::function<void()>>> s_functions_run_at_backend_exit;
-
-void add_function_to_run_at_backend_exit(std::function<void()> function)
-{
-    if (!s_functions_run_at_backend_exit)
-        s_functions_run_at_backend_exit.reset(new std::vector<std::function<void()>>());
-    s_functions_run_at_backend_exit->push_back(std::move(function));
-}
-
-void run_functions_at_backend_exit()
-{
-    for (auto it = s_functions_run_at_backend_exit->rbegin();
-         it != s_functions_run_at_backend_exit->rend(); ++it)
-    {
-        (*it)();
-    }
-    s_functions_run_at_backend_exit.release();
-}
-
-void debug_dump(unsigned level, const Genesys_Settings& settings)
-{
-    DBG(level, "settings:\n"
-        "Resolution X/Y : %u / %u dpi\n"
-        "Lines : %u\n"
-        "Pixels per line : %u\n"
-        "Depth : %u\n"
-        "Start position X/Y : %.3f/%.3f\n"
-        "Scan mode : %d\n\n",
-        settings.xres, settings.yres,
-        settings.lines, settings.pixels, settings.depth,
-        settings.tl_x, settings.tl_y,
-        static_cast<unsigned>(settings.scan_mode));
-}
-
-void debug_dump(unsigned level, const SetupParams& params)
-{
-    DBG(level, "settings:\n"
-        "Resolution X/Y : %u / %u dpi\n"
-        "Lines : %u\n"
-        "Pixels per line : %u\n"
-        "Depth : %u\n"
-        "Channels : %u\n"
-        "Start position X/Y : %g / %g\n"
-        "Scan mode : %d\n"
-        "Color filter : %d\n"
-        "Flags : %x\n",
-        params.xres, params.yres,
-        params.lines, params.pixels,
-        params.depth, params.channels,
-        params.startx, params.starty,
-        static_cast<unsigned>(params.scan_mode),
-        static_cast<unsigned>(params.color_filter),
-        params.flags);
-}
-
-void debug_dump(unsigned level, const Genesys_Current_Setup& setup)
-{
-    DBG(level, "current_setup:\n"
-        "Pixels: %d\n"
-        "Lines: %d\n"
-        "Depth: %d\n"
-        "Channels: %d\n"
-        "exposure_time: %d\n"
-        "Resolution X/Y: %g %g\n"
-        "ccd_size_divisor: %d\n"
-        "stagger: %d\n"
-        "max_shift: %d\n",
-        setup.pixels,
-        setup.lines,
-        setup.depth,
-        setup.channels,
-        setup.exposure_time,
-        setup.xres, setup.yres,
-        setup.ccd_size_divisor,
-        setup.stagger,
-        setup.max_shift);
-}