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diff --git a/backend/genesys/gl124_registers.h b/backend/genesys/gl124_registers.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   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.
+*/
+
+#ifndef BACKEND_GENESYS_GL124_REGISTERS_H
+#define BACKEND_GENESYS_GL124_REGISTERS_H
+
+#include <cstdint>
+
+namespace genesys {
+namespace gl124 {
+
+using RegAddr = std::uint16_t;
+using RegMask = std::uint8_t;
+using RegShift = unsigned;
+
+static constexpr RegAddr REG_0x01 = 0x01;
+static constexpr RegMask REG_0x01_CISSET = 0x80;
+static constexpr RegMask REG_0x01_DOGENB = 0x40;
+static constexpr RegMask REG_0x01_DVDSET = 0x20;
+static constexpr RegMask REG_0x01_STAGGER = 0x10;
+static constexpr RegMask REG_0x01_COMPENB = 0x08;
+static constexpr RegMask REG_0x01_TRUEGRAY = 0x04;
+static constexpr RegMask REG_0x01_SHDAREA = 0x02;
+static constexpr RegMask REG_0x01_SCAN = 0x01;
+
+static constexpr RegAddr REG_0x02 = 0x02;
+static constexpr RegMask REG_0x02_NOTHOME = 0x80;
+static constexpr RegMask REG_0x02_ACDCDIS = 0x40;
+static constexpr RegMask REG_0x02_AGOHOME = 0x20;
+static constexpr RegMask REG_0x02_MTRPWR = 0x10;
+static constexpr RegMask REG_0x02_FASTFED = 0x08;
+static constexpr RegMask REG_0x02_MTRREV = 0x04;
+static constexpr RegMask REG_0x02_HOMENEG = 0x02;
+static constexpr RegMask REG_0x02_LONGCURV = 0x01;
+
+static constexpr RegAddr REG_0x03 = 0x03;
+static constexpr RegMask REG_0x03_LAMPDOG = 0x80;
+static constexpr RegMask REG_0x03_AVEENB = 0x40;
+static constexpr RegMask REG_0x03_XPASEL = 0x20;
+static constexpr RegMask REG_0x03_LAMPPWR = 0x10;
+static constexpr RegMask REG_0x03_LAMPTIM = 0x0f;
+
+static constexpr RegAddr REG_0x04 = 0x04;
+static constexpr RegMask REG_0x04_LINEART = 0x80;
+static constexpr RegMask REG_0x04_BITSET = 0x40;
+static constexpr RegMask REG_0x04_FILTER = 0x30;
+static constexpr RegMask REG_0x04_AFEMOD = 0x07;
+
+static constexpr RegAddr REG_0x05 = 0x05;
+static constexpr RegMask REG_0x05_DPIHW = 0xc0;
+static constexpr RegMask REG_0x05_DPIHW_600 = 0x00;
+static constexpr RegMask REG_0x05_DPIHW_1200 = 0x40;
+static constexpr RegMask REG_0x05_DPIHW_2400 = 0x80;
+static constexpr RegMask REG_0x05_DPIHW_4800 = 0xc0;
+static constexpr RegMask REG_0x05_MTLLAMP = 0x30;
+static constexpr RegMask REG_0x05_GMMENB = 0x08;
+static constexpr RegMask REG_0x05_ENB20M = 0x04;
+static constexpr RegMask REG_0x05_MTLBASE = 0x03;
+
+static constexpr RegAddr REG_0x06 = 0x06;
+static constexpr RegMask REG_0x06_SCANMOD = 0xe0;
+static constexpr RegMask REG_0x06S_SCANMOD = 5;
+static constexpr RegMask REG_0x06_PWRBIT = 0x10;
+static constexpr RegMask REG_0x06_GAIN4 = 0x08;
+static constexpr RegMask REG_0x06_OPTEST = 0x07;
+
+static constexpr RegMask REG_0x07_LAMPSIM = 0x80;
+
+static constexpr RegMask REG_0x08_DRAM2X = 0x80;
+static constexpr RegMask REG_0x08_MPENB = 0x20;
+static constexpr RegMask REG_0x08_CIS_LINE = 0x10;
+static constexpr RegMask REG_0x08_IR2_ENB = 0x08;
+static constexpr RegMask REG_0x08_IR1_ENB = 0x04;
+static constexpr RegMask REG_0x08_ENB24M = 0x01;
+
+static constexpr RegMask REG_0x09_MCNTSET = 0xc0;
+static constexpr RegMask REG_0x09_EVEN1ST = 0x20;
+static constexpr RegMask REG_0x09_BLINE1ST = 0x10;
+static constexpr RegMask REG_0x09_BACKSCAN = 0x08;
+static constexpr RegMask REG_0x09_OUTINV = 0x04;
+static constexpr RegMask REG_0x09_SHORTTG = 0x02;
+
+static constexpr RegShift REG_0x09S_MCNTSET = 6;
+static constexpr RegShift REG_0x09S_CLKSET = 4;
+
+static constexpr RegAddr REG_0x0A = 0x0a;
+static constexpr RegMask REG_0x0A_SIFSEL = 0xc0;
+static constexpr RegShift REG_0x0AS_SIFSEL = 6;
+static constexpr RegMask REG_0x0A_SHEETFED = 0x20;
+static constexpr RegMask REG_0x0A_LPWMEN = 0x10;
+
+static constexpr RegAddr REG_0x0B = 0x0b;
+static constexpr RegMask REG_0x0B_DRAMSEL = 0x07;
+static constexpr RegMask REG_0x0B_16M = 0x01;
+static constexpr RegMask REG_0x0B_64M = 0x02;
+static constexpr RegMask REG_0x0B_128M = 0x03;
+static constexpr RegMask REG_0x0B_256M = 0x04;
+static constexpr RegMask REG_0x0B_512M = 0x05;
+static constexpr RegMask REG_0x0B_1G = 0x06;
+static constexpr RegMask REG_0x0B_ENBDRAM = 0x08;
+static constexpr RegMask REG_0x0B_RFHDIS = 0x10;
+static constexpr RegMask REG_0x0B_CLKSET = 0xe0;
+static constexpr RegMask REG_0x0B_24MHZ = 0x00;
+static constexpr RegMask REG_0x0B_30MHZ = 0x20;
+static constexpr RegMask REG_0x0B_40MHZ = 0x40;
+static constexpr RegMask REG_0x0B_48MHZ = 0x60;
+static constexpr RegMask REG_0x0B_60MHZ = 0x80;
+
+static constexpr RegAddr REG_0x0D = 0x0d;
+static constexpr RegMask REG_0x0D_MTRP_RDY = 0x80;
+static constexpr RegMask REG_0x0D_FULLSTP = 0x10;
+static constexpr RegMask REG_0x0D_CLRMCNT = 0x04;
+static constexpr RegMask REG_0x0D_CLRDOCJM = 0x02;
+static constexpr RegMask REG_0x0D_CLRLNCNT = 0x01;
+
+static constexpr RegAddr REG_0x0F = 0x0f;
+
+static constexpr RegMask REG_0x16_CTRLHI = 0x80;
+static constexpr RegMask REG_0x16_TOSHIBA = 0x40;
+static constexpr RegMask REG_0x16_TGINV = 0x20;
+static constexpr RegMask REG_0x16_CK1INV = 0x10;
+static constexpr RegMask REG_0x16_CK2INV = 0x08;
+static constexpr RegMask REG_0x16_CTRLINV = 0x04;
+static constexpr RegMask REG_0x16_CKDIS = 0x02;
+static constexpr RegMask REG_0x16_CTRLDIS = 0x01;
+
+static constexpr RegMask REG_0x17_TGMODE = 0xc0;
+static constexpr RegMask REG_0x17_SNRSYN = 0x0f;
+
+static constexpr RegAddr REG_0x18 = 0x18;
+static constexpr RegMask REG_0x18_CNSET = 0x80;
+static constexpr RegMask REG_0x18_DCKSEL = 0x60;
+static constexpr RegMask REG_0x18_CKTOGGLE = 0x10;
+static constexpr RegMask REG_0x18_CKDELAY = 0x0c;
+static constexpr RegMask REG_0x18_CKSEL = 0x03;
+
+static constexpr RegMask REG_0x1A_SW2SET = 0x80;
+static constexpr RegMask REG_0x1A_SW1SET = 0x40;
+static constexpr RegMask REG_0x1A_MANUAL3 = 0x02;
+static constexpr RegMask REG_0x1A_MANUAL1 = 0x01;
+static constexpr RegMask REG_0x1A_CK4INV = 0x08;
+static constexpr RegMask REG_0x1A_CK3INV = 0x04;
+static constexpr RegMask REG_0x1A_LINECLP = 0x02;
+
+static constexpr RegMask REG_0x1C_TBTIME = 0x07;
+
+static constexpr RegAddr REG_0x1D = 0x1d;
+static constexpr RegMask REG_0x1D_CK4LOW = 0x80;
+static constexpr RegMask REG_0x1D_CK3LOW = 0x40;
+static constexpr RegMask REG_0x1D_CK1LOW = 0x20;
+static constexpr RegMask REG_0x1D_LINESEL = 0x1f;
+static constexpr RegShift REG_0x1DS_LINESEL = 0;
+
+static constexpr RegAddr REG_0x1E = 0x1e;
+static constexpr RegMask REG_0x1E_WDTIME = 0xf0;
+static constexpr RegShift REG_0x1ES_WDTIME = 4;
+
+static constexpr RegAddr REG_0x30 = 0x30;
+static constexpr RegAddr REG_0x31 = 0x31;
+static constexpr RegAddr REG_0x32 = 0x32;
+static constexpr RegMask REG_0x32_GPIO16 = 0x80;
+static constexpr RegMask REG_0x32_GPIO15 = 0x40;
+static constexpr RegMask REG_0x32_GPIO14 = 0x20;
+static constexpr RegMask REG_0x32_GPIO13 = 0x10;
+static constexpr RegMask REG_0x32_GPIO12 = 0x08;
+static constexpr RegMask REG_0x32_GPIO11 = 0x04;
+static constexpr RegMask REG_0x32_GPIO10 = 0x02;
+static constexpr RegMask REG_0x32_GPIO9 = 0x01;
+static constexpr RegAddr REG_0x33 = 0x33;
+static constexpr RegAddr REG_0x34 = 0x34;
+static constexpr RegAddr REG_0x35 = 0x35;
+static constexpr RegAddr REG_0x36 = 0x36;
+static constexpr RegAddr REG_0x37 = 0x37;
+static constexpr RegAddr REG_0x38 = 0x38;
+static constexpr RegAddr REG_0x39 = 0x39;
+
+static constexpr RegAddr REG_0x60 = 0x60;
+static constexpr RegMask REG_0x60_LED4TG = 0x80;
+static constexpr RegMask REG_0x60_YENB = 0x40;
+static constexpr RegMask REG_0x60_YBIT = 0x20;
+static constexpr RegMask REG_0x60_ACYNCNRLC = 0x10;
+static constexpr RegMask REG_0x60_ENOFFSET = 0x08;
+static constexpr RegMask REG_0x60_LEDADD = 0x04;
+static constexpr RegMask REG_0x60_CK4ADC = 0x02;
+static constexpr RegMask REG_0x60_AUTOCONF = 0x01;
+
+static constexpr RegAddr REG_0x80 = 0x80;
+static constexpr RegAddr REG_0x81 = 0x81;
+
+static constexpr RegAddr REG_0xA0 = 0xa0;
+static constexpr RegMask REG_0xA0_FSTPSEL = 0x38;
+static constexpr RegShift REG_0xA0S_FSTPSEL = 3;
+static constexpr RegMask REG_0xA0_STEPSEL = 0x07;
+static constexpr RegShift REG_0xA0S_STEPSEL = 0;
+
+static constexpr RegAddr REG_0xA1 = 0xa1;
+static constexpr RegAddr REG_0xA2 = 0xa2;
+static constexpr RegAddr REG_0xA3 = 0xa3;
+static constexpr RegAddr REG_0xA4 = 0xa4;
+static constexpr RegAddr REG_0xA5 = 0xa5;
+static constexpr RegAddr REG_0xA6 = 0xa6;
+static constexpr RegAddr REG_0xA7 = 0xa7;
+static constexpr RegAddr REG_0xA8 = 0xa8;
+static constexpr RegAddr REG_0xA9 = 0xa9;
+static constexpr RegAddr REG_0xAA = 0xaa;
+static constexpr RegAddr REG_0xAB = 0xab;
+static constexpr RegAddr REG_0xAC = 0xac;
+static constexpr RegAddr REG_0xAD = 0xad;
+static constexpr RegAddr REG_0xAE = 0xae;
+static constexpr RegAddr REG_0xAF = 0xaf;
+static constexpr RegAddr REG_0xB0 = 0xb0;
+static constexpr RegAddr REG_0xB1 = 0xb1;
+
+static constexpr RegAddr REG_0xB2 = 0xb2;
+static constexpr RegMask REG_0xB2_Z1MOD = 0x1f;
+static constexpr RegAddr REG_0xB3 = 0xb3;
+static constexpr RegMask REG_0xB3_Z1MOD = 0xff;
+static constexpr RegAddr REG_0xB4 = 0xb4;
+static constexpr RegMask REG_0xB4_Z1MOD = 0xff;
+
+static constexpr RegAddr REG_0xB5 = 0xb5;
+static constexpr RegMask REG_0xB5_Z2MOD = 0x1f;
+static constexpr RegAddr REG_0xB6 = 0xb6;
+static constexpr RegMask REG_0xB6_Z2MOD = 0xff;
+static constexpr RegAddr REG_0xB7 = 0xb7;
+static constexpr RegMask REG_0xB7_Z2MOD = 0xff;
+
+static constexpr RegAddr REG_0x100 = 0x100;
+static constexpr RegMask REG_0x100_DOCSNR = 0x80;
+static constexpr RegMask REG_0x100_ADFSNR = 0x40;
+static constexpr RegMask REG_0x100_COVERSNR = 0x20;
+static constexpr RegMask REG_0x100_CHKVER = 0x10;
+static constexpr RegMask REG_0x100_DOCJAM = 0x08;
+static constexpr RegMask REG_0x100_HISPDFLG = 0x04;
+static constexpr RegMask REG_0x100_MOTMFLG = 0x02;
+static constexpr RegMask REG_0x100_DATAENB = 0x01;
+
+static constexpr RegAddr REG_0x114 = 0x114;
+static constexpr RegAddr REG_0x115 = 0x115;
+
+static constexpr RegAddr REG_LINCNT = 0x25;
+static constexpr RegAddr REG_MAXWD = 0x28;
+static constexpr RegAddr REG_DPISET = 0x2c;
+static constexpr RegAddr REG_FEEDL = 0x3d;
+static constexpr RegAddr REG_CK1MAP = 0x74;
+static constexpr RegAddr REG_CK3MAP = 0x77;
+static constexpr RegAddr REG_CK4MAP = 0x7a;
+static constexpr RegAddr REG_LPERIOD = 0x7d;
+static constexpr RegAddr REG_DUMMY = 0x80;
+static constexpr RegAddr REG_STRPIXEL = 0x82;
+static constexpr RegAddr REG_ENDPIXEL = 0x85;
+static constexpr RegAddr REG_EXPDMY = 0x88;
+static constexpr RegAddr REG_EXPR = 0x8a;
+static constexpr RegAddr REG_EXPG = 0x8d;
+static constexpr RegAddr REG_EXPB = 0x90;
+static constexpr RegAddr REG_SEGCNT = 0x93;
+static constexpr RegAddr REG_TG0CNT = 0x96;
+static constexpr RegAddr REG_SCANFED = 0xa2;
+static constexpr RegAddr REG_STEPNO = 0xa4;
+static constexpr RegAddr REG_FWDSTEP = 0xa6;
+static constexpr RegAddr REG_BWDSTEP = 0xa8;
+static constexpr RegAddr REG_FASTNO = 0xaa;
+static constexpr RegAddr REG_FSHDEC = 0xac;
+static constexpr RegAddr REG_FMOVNO = 0xae;
+static constexpr RegAddr REG_FMOVDEC = 0xb0;
+static constexpr RegAddr REG_Z1MOD = 0xb2;
+static constexpr RegAddr REG_Z2MOD = 0xb5;
+
+static constexpr RegAddr REG_TRUER = 0x110;
+static constexpr RegAddr REG_TRUEG = 0x111;
+static constexpr RegAddr REG_TRUEB = 0x112;
+
+} // namespace gl124
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_GL843_REGISTERS_H