Update upstream source from tag 'upstream/1.0.31'

Update to upstream version '1.0.31'
with Debian dir aa7a39fe56343f5e164eec83783f4c923a394865

1 files changed, 1066 insertions, 0 deletions

diff --git a/backend/genesys/gl842.cpp b/backend/genesys/gl842.cpp
new file mode 100644
index 0000000..d5bebe5
--- /dev/null
+++ b/backend/genesys/gl842.cpp
@@ -0,0 +1,1066 @@
+/*  sane - Scanner Access Now Easy.
+
+    Copyright (C) 2010-2013 Stéphane Voltz <stef.dev@free.fr>
+    Copyright (C) 2020 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.
+*/
+
+#define DEBUG_DECLARE_ONLY
+
+#include "gl842_registers.h"
+#include "gl842.h"
+#include "test_settings.h"
+
+#include <string>
+#include <vector>
+
+namespace genesys {
+namespace gl842 {
+
+static void gl842_init_registers(Genesys_Device& dev)
+{
+    // Within this function SENSOR_DEF marker documents that a register is part
+    // of the sensors definition and the actual value is set in
+    // gl842_setup_sensor().
+
+    DBG_HELPER(dbg);
+
+    dev.reg.clear();
+
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x01, 0x00);
+        dev.reg.init_reg(0x02, 0x78);
+        dev.reg.init_reg(0x03, 0xbf);
+        dev.reg.init_reg(0x04, 0x22);
+        dev.reg.init_reg(0x05, 0x48);
+
+        dev.reg.init_reg(0x06, 0xb8);
+
+        dev.reg.init_reg(0x07, 0x00);
+        dev.reg.init_reg(0x08, 0x00);
+        dev.reg.init_reg(0x09, 0x00);
+        dev.reg.init_reg(0x0a, 0x00);
+        dev.reg.init_reg(0x0d, 0x01);
+    } else if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        dev.reg.init_reg(0x01, 0x82);
+        dev.reg.init_reg(0x02, 0x10);
+        dev.reg.init_reg(0x03, 0x60);
+        dev.reg.init_reg(0x04, 0x10);
+        dev.reg.init_reg(0x05, 0x8c);
+
+        dev.reg.init_reg(0x06, 0x18);
+
+        //dev.reg.init_reg(0x07, 0x00);
+        dev.reg.init_reg(0x08, 0x00);
+        dev.reg.init_reg(0x09, 0x21);
+        dev.reg.init_reg(0x0a, 0x00);
+        dev.reg.init_reg(0x0d, 0x00);
+    }
+
+    dev.reg.init_reg(0x10, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+    dev.reg.init_reg(0x11, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+    dev.reg.init_reg(0x12, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+    dev.reg.init_reg(0x13, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+    dev.reg.init_reg(0x14, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+    dev.reg.init_reg(0x15, 0x00); // exposure, overwritten in scanner_setup_sensor() below
+
+    // CCD signal settings.
+    dev.reg.init_reg(0x16, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x17, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x18, 0x00); // SENSOR_DEF
+
+    // EXPDMY[0:7]: Exposure time of dummy lines.
+    dev.reg.init_reg(0x19, 0x00); // SENSOR_DEF
+
+    // Various CCD clock settings.
+    dev.reg.init_reg(0x1a, 0x00); // SENSOR_DEF
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x1b, 0x00); // SENSOR_DEF
+    }
+    dev.reg.init_reg(0x1c, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x1d, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x1e, 0x10); // WDTIME, LINESEL: setup during sensor and motor setup
+
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x1f, 0x01);
+        dev.reg.init_reg(0x20, 0x27); // BUFSEL: buffer full condition
+    } else if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        dev.reg.init_reg(0x1f, 0x02);
+        dev.reg.init_reg(0x20, 0x02); // BUFSEL: buffer full condition
+    }
+
+    dev.reg.init_reg(0x21, 0x10); // STEPNO: set during motor setup
+    dev.reg.init_reg(0x22, 0x10); // FWDSTEP: set during motor setup
+    dev.reg.init_reg(0x23, 0x10); // BWDSTEP: set during motor setup
+    dev.reg.init_reg(0x24, 0x10); // FASTNO: set during motor setup
+    dev.reg.init_reg(0x25, 0x00); // LINCNT: set during motor setup
+    dev.reg.init_reg(0x26, 0x00); // LINCNT: set during motor setup
+    dev.reg.init_reg(0x27, 0x00); // LINCNT: set during motor setup
+
+    dev.reg.init_reg(0x29, 0xff); // LAMPPWM
+
+    dev.reg.init_reg(0x2c, 0x02); // DPISET: set during sensor setup
+    dev.reg.init_reg(0x2d, 0x58); // DPISET: set during sensor setup
+
+    dev.reg.init_reg(0x2e, 0x80); // BWHI: black/white low threshdold
+    dev.reg.init_reg(0x2f, 0x80); // BWLOW: black/white low threshold
+
+    dev.reg.init_reg(0x30, 0x00); // STRPIXEL: set during sensor setup
+    dev.reg.init_reg(0x31, 0x49); // STRPIXEL: set during sensor setup
+    dev.reg.init_reg(0x32, 0x53); // ENDPIXEL: set during sensor setup
+    dev.reg.init_reg(0x33, 0xb9); // ENDPIXEL: set during sensor setup
+
+    dev.reg.init_reg(0x34, 0x13); // DUMMY: SENSOR_DEF
+    dev.reg.init_reg(0x35, 0x00); // MAXWD: set during scan setup
+    dev.reg.init_reg(0x36, 0x40); // MAXWD: set during scan setup
+    dev.reg.init_reg(0x37, 0x00); // MAXWD: set during scan setup
+    dev.reg.init_reg(0x38, 0x2a); // LPERIOD: SENSOR_DEF
+    dev.reg.init_reg(0x39, 0xf8); // LPERIOD: SENSOR_DEF
+    dev.reg.init_reg(0x3d, 0x00); // FEEDL: set during motor setup
+    dev.reg.init_reg(0x3e, 0x00); // FEEDL: set during motor setup
+    dev.reg.init_reg(0x3f, 0x01); // FEEDL: set during motor setup
+
+    dev.reg.init_reg(0x52, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x53, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x54, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x55, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x56, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x57, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x58, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x59, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x5a, 0x00); // SENSOR_DEF
+
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x5e, 0x01); // DECSEL, STOPTIM
+    } else if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        dev.reg.init_reg(0x5e, 0x41); // DECSEL, STOPTIM
+        dev.reg.init_reg(0x5d, 0x20);
+    }
+    dev.reg.init_reg(0x5f, 0x10); // FMOVDEC: set during motor setup
+
+    dev.reg.init_reg(0x60, 0x00); // Z1MOD: overwritten during motor setup
+    dev.reg.init_reg(0x61, 0x00); // Z1MOD: overwritten during motor setup
+    dev.reg.init_reg(0x62, 0x00); // Z1MOD: overwritten during motor setup
+    dev.reg.init_reg(0x63, 0x00); // Z2MOD: overwritten during motor setup
+    dev.reg.init_reg(0x64, 0x00); // Z2MOD: overwritten during motor setup
+    dev.reg.init_reg(0x65, 0x00); // Z2MOD: overwritten during motor setup
+
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x67, 0x7f); // STEPSEL, MTRPWM: partially overwritten during motor setup
+        dev.reg.init_reg(0x68, 0x7f); // FSTPSEL, FASTPWM: partially overwritten during motor setup
+    } else if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        dev.reg.init_reg(0x66, 0x00); // PHFREQ
+        dev.reg.init_reg(0x67, 0x40); // STEPSEL, MTRPWM: partially overwritten during motor setup
+        dev.reg.init_reg(0x68, 0x40); // FSTPSEL, FASTPWM: partially overwritten during motor setup
+    }
+    dev.reg.init_reg(0x69, 0x10); // FSHDEC: overwritten during motor setup
+    dev.reg.init_reg(0x6a, 0x10); // FMOVNO: overwritten during motor setup
+
+    // 0x6b, 0x6c, 0x6d, 0x6e, 0x6f - set according to gpio tables. See gl842_init_gpio.
+
+    dev.reg.init_reg(0x70, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x71, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x72, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x73, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x74, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x75, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x76, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x77, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x78, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x79, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x7a, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x7b, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x7c, 0x00); // SENSOR_DEF
+    dev.reg.init_reg(0x7d, 0x00); // SENSOR_DEF
+
+    // 0x7e - set according to gpio tables. See gl842_init_gpio.
+
+    dev.reg.init_reg(0x7f, 0x00); // SENSOR_DEF
+
+    // VRHOME, VRMOVE, VRBACK, VRSCAN: Vref settings of the motor driver IC for
+    // moving in various situations.
+    dev.reg.init_reg(0x80, 0x00); // MOTOR_PROFILE
+
+    if (dev.model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev.reg.init_reg(0x81, 0x00);
+        dev.reg.init_reg(0x82, 0x00);
+        dev.reg.init_reg(0x83, 0x00);
+        dev.reg.init_reg(0x84, 0x00);
+        dev.reg.init_reg(0x85, 0x00);
+        dev.reg.init_reg(0x86, 0x00);
+        dev.reg.init_reg(0x87, 0x00);
+    } else if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        dev.reg.init_reg(0x7e, 0x00);
+        dev.reg.init_reg(0x81, 0x00);
+        dev.reg.init_reg(0x82, 0x0f);
+        dev.reg.init_reg(0x83, 0x00);
+        dev.reg.init_reg(0x84, 0x0e);
+        dev.reg.init_reg(0x85, 0x00);
+        dev.reg.init_reg(0x86, 0x0d);
+        dev.reg.init_reg(0x87, 0x00);
+        dev.reg.init_reg(0x88, 0x00);
+        dev.reg.init_reg(0x89, 0x00);
+    }
+
+    const auto& sensor = sanei_genesys_find_sensor_any(&dev);
+    sanei_genesys_set_dpihw(dev.reg, sensor.register_dpihw);
+
+    scanner_setup_sensor(dev, sensor, dev.reg);
+}
+
+// Set values of analog frontend
+void CommandSetGl842::set_fe(Genesys_Device* dev, const Genesys_Sensor& sensor, uint8_t set) const
+{
+    DBG_HELPER_ARGS(dbg, "%s", set == AFE_INIT ? "init" :
+                               set == AFE_SET ? "set" :
+                               set == AFE_POWER_SAVE ? "powersave" : "huh?");
+    (void) sensor;
+
+    if (set == AFE_INIT) {
+        dev->frontend = dev->frontend_initial;
+    }
+
+    // check analog frontend type
+    // FIXME: looks like we write to that register with initial data
+    uint8_t fe_type = dev->interface->read_register(REG_0x04) & REG_0x04_FESET;
+    if (fe_type == 2 || dev->model->model_id == ModelId::CANON_LIDE_90) {
+        for (const auto& reg : dev->frontend.regs) {
+            dev->interface->write_fe_register(reg.address, reg.value);
+        }
+        return;
+    }
+    if (fe_type != 0) {
+        throw SaneException(SANE_STATUS_UNSUPPORTED, "unsupported frontend type %d", fe_type);
+    }
+
+    for (unsigned i = 1; i <= 3; i++) {
+        dev->interface->write_fe_register(i, dev->frontend.regs.get_value(0x00 + i));
+    }
+    for (const auto& reg : sensor.custom_fe_regs) {
+        dev->interface->write_fe_register(reg.address, reg.value);
+    }
+
+    for (unsigned i = 0; i < 3; i++) {
+        dev->interface->write_fe_register(0x20 + i, dev->frontend.get_offset(i));
+    }
+
+    for (unsigned i = 0; i < 3; i++) {
+        dev->interface->write_fe_register(0x28 + i, dev->frontend.get_gain(i));
+    }
+}
+
+static void gl842_init_motor_regs_scan(Genesys_Device* dev,
+                                       const Genesys_Sensor& sensor,
+                                       const ScanSession& session,
+                                       Genesys_Register_Set* reg,
+                                       const MotorProfile& motor_profile,
+                                       unsigned int exposure,
+                                       unsigned scan_yres,
+                                       unsigned int scan_lines,
+                                       unsigned int scan_dummy,
+                                       unsigned int feed_steps,
+                                       ScanFlag flags)
+{
+    DBG_HELPER_ARGS(dbg, "exposure=%d, scan_yres=%d, step_type=%d, scan_lines=%d, scan_dummy=%d, "
+                         "feed_steps=%d, flags=%x",
+                    exposure, scan_yres, static_cast<unsigned>(motor_profile.step_type),
+                    scan_lines, scan_dummy, feed_steps, static_cast<unsigned>(flags));
+
+    unsigned step_multiplier = 2;
+    bool use_fast_fed = false;
+
+    if ((scan_yres >= 300 && feed_steps > 900) || (has_flag(flags, ScanFlag::FEEDING))) {
+        use_fast_fed = true;
+    }
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
+
+    reg->set24(REG_LINCNT, scan_lines);
+
+    reg->set8(REG_0x02, 0);
+    sanei_genesys_set_motor_power(*reg, true);
+
+    std::uint8_t reg02 = reg->get8(REG_0x02);
+    if (use_fast_fed) {
+        reg02 |= REG_0x02_FASTFED;
+    } else {
+        reg02 &= ~REG_0x02_FASTFED;
+    }
+
+    // in case of automatic go home, move until home sensor
+    if (has_flag(flags, ScanFlag::AUTO_GO_HOME)) {
+        reg02 |= REG_0x02_AGOHOME | REG_0x02_NOTHOME;
+    }
+
+    // disable backtracking if needed
+    if (has_flag(flags, ScanFlag::DISABLE_BUFFER_FULL_MOVE) ||
+        (scan_yres >= 2400) ||
+        (scan_yres >= sensor.full_resolution))
+    {
+        reg02 |= REG_0x02_ACDCDIS;
+    }
+
+    if (has_flag(flags, ScanFlag::REVERSE)) {
+        reg02 |= REG_0x02_MTRREV;
+    } else {
+        reg02 &= ~REG_0x02_MTRREV;
+    }
+    reg->set8(REG_0x02, reg02);
+
+    // scan and backtracking slope table
+    auto scan_table = create_slope_table(dev->model->asic_type, dev->motor, scan_yres, exposure,
+                                         step_multiplier, motor_profile);
+
+    scanner_send_slope_table(dev, sensor, SCAN_TABLE, scan_table.table);
+    scanner_send_slope_table(dev, sensor, BACKTRACK_TABLE, scan_table.table);
+    scanner_send_slope_table(dev, sensor, STOP_TABLE, scan_table.table);
+
+    reg->set8(REG_STEPNO, scan_table.table.size() / step_multiplier);
+    reg->set8(REG_FASTNO, scan_table.table.size() / step_multiplier);
+    reg->set8(REG_FSHDEC, scan_table.table.size() / step_multiplier);
+
+    // fast table
+    const auto* fast_profile = get_motor_profile_ptr(dev->motor.fast_profiles, 0, session);
+    if (fast_profile == nullptr) {
+        fast_profile = &motor_profile;
+    }
+
+    auto fast_table = create_slope_table_fastest(dev->model->asic_type, step_multiplier,
+                                                 *fast_profile);
+
+    scanner_send_slope_table(dev, sensor, FAST_TABLE, fast_table.table);
+    scanner_send_slope_table(dev, sensor, HOME_TABLE, fast_table.table);
+
+    reg->set8(REG_FMOVNO, fast_table.table.size() / step_multiplier);
+
+    if (motor_profile.motor_vref != -1 && fast_profile->motor_vref != 1) {
+        std::uint8_t vref = 0;
+        vref |= (motor_profile.motor_vref << REG_0x80S_TABLE1_NORMAL) & REG_0x80_TABLE1_NORMAL;
+        vref |= (motor_profile.motor_vref << REG_0x80S_TABLE2_BACK) & REG_0x80_TABLE2_BACK;
+        vref |= (fast_profile->motor_vref << REG_0x80S_TABLE4_FAST) & REG_0x80_TABLE4_FAST;
+        vref |= (fast_profile->motor_vref << REG_0x80S_TABLE5_GO_HOME) & REG_0x80_TABLE5_GO_HOME;
+        reg->set8(REG_0x80, vref);
+    }
+
+    // substract acceleration distance from feedl
+    unsigned feedl = feed_steps;
+    feedl <<= static_cast<unsigned>(motor_profile.step_type);
+
+    unsigned dist = scan_table.table.size() / step_multiplier;
+
+    if (use_fast_fed) {
+        dist += (fast_table.table.size() / step_multiplier) * 2;
+    }
+
+    // make sure when don't insane value : XXX STEF XXX in this case we should
+    // fall back to single table move
+    if (dist < feedl) {
+        feedl -= dist;
+    } else {
+        feedl = 1;
+    }
+
+    reg->set24(REG_FEEDL, feedl);
+
+    // doesn't seem to matter that much
+    std::uint32_t z1, z2;
+    sanei_genesys_calculate_zmod(use_fast_fed,
+                                 exposure,
+                                 scan_table.table,
+                                 scan_table.table.size() / step_multiplier,
+                                 feedl,
+                                 scan_table.table.size() / step_multiplier,
+                                 &z1,
+                                 &z2);
+    if (scan_yres > 600) {
+        z1 = 0;
+        z2 = 0;
+    }
+
+    reg->set24(REG_Z1MOD, z1);
+    reg->set24(REG_Z2MOD, z2);
+
+    reg->set8_mask(REG_0x1E, scan_dummy, 0x0f);
+
+    reg->set8_mask(REG_0x67, static_cast<unsigned>(motor_profile.step_type) << REG_0x67S_STEPSEL,
+                   REG_0x67_STEPSEL);
+    reg->set8_mask(REG_0x68, static_cast<unsigned>(fast_profile->step_type) << REG_0x68S_FSTPSEL,
+                   REG_0x68_FSTPSEL);
+
+    // steps for STOP table
+    reg->set8(REG_FMOVDEC, fast_table.table.size() / step_multiplier);
+}
+
+static void gl842_init_optical_regs_scan(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                         Genesys_Register_Set* reg, unsigned int exposure,
+                                         const ScanSession& session)
+{
+    DBG_HELPER(dbg);
+
+    scanner_setup_sensor(*dev, sensor, *reg);
+
+    dev->cmd_set->set_fe(dev, sensor, AFE_SET);
+
+    // enable shading
+    regs_set_optical_off(dev->model->asic_type, *reg);
+    if (has_flag(session.params.flags, ScanFlag::DISABLE_SHADING) ||
+        has_flag(dev->model->flags, ModelFlag::DISABLE_SHADING_CALIBRATION) ||
+        session.use_host_side_calib)
+    {
+        reg->find_reg(REG_0x01).value &= ~REG_0x01_DVDSET;
+
+    } else {
+        reg->find_reg(REG_0x01).value |= REG_0x01_DVDSET;
+    }
+
+    bool use_shdarea = true;
+
+    if (use_shdarea) {
+        reg->find_reg(REG_0x01).value |= REG_0x01_SHDAREA;
+    } else {
+        reg->find_reg(REG_0x01).value &= ~REG_0x01_SHDAREA;
+    }
+
+    if (dev->model->model_id == ModelId::CANON_8600F) {
+        reg->find_reg(REG_0x03).value |= REG_0x03_AVEENB;
+    } else {
+        reg->find_reg(REG_0x03).value &= ~REG_0x03_AVEENB;
+    }
+
+    // FIXME: we probably don't need to set exposure to registers at this point. It was this way
+    // before a refactor.
+    sanei_genesys_set_lamp_power(dev, sensor, *reg,
+                                 !has_flag(session.params.flags, ScanFlag::DISABLE_LAMP));
+
+    // select XPA
+    reg->find_reg(REG_0x03).value &= ~REG_0x03_XPASEL;
+    if (has_flag(session.params.flags, ScanFlag::USE_XPA)) {
+        reg->find_reg(REG_0x03).value |= REG_0x03_XPASEL;
+    }
+    reg->state.is_xpa_on = has_flag(session.params.flags, ScanFlag::USE_XPA);
+
+    // BW threshold
+    reg->set8(REG_0x2E, 0x7f);
+    reg->set8(REG_0x2F, 0x7f);
+
+    // monochrome / color scan parameters
+    std::uint8_t reg04 = reg->get8(REG_0x04);
+    reg04 = reg04 & REG_0x04_FESET;
+
+    switch (session.params.depth) {
+        case 8:
+            break;
+        case 16:
+            reg04 |= REG_0x04_BITSET;
+            break;
+    }
+
+    if (session.params.channels == 1) {
+        switch (session.params.color_filter) {
+            case ColorFilter::RED: reg04 |= 0x14; break;
+            case ColorFilter::BLUE: reg04 |= 0x1c; break;
+            case ColorFilter::GREEN: reg04 |= 0x18; break;
+            default:
+                break; // should not happen
+        }
+    } else {
+        switch (dev->frontend.layout.type) {
+            case FrontendType::WOLFSON:
+                // pixel by pixel
+                reg04 |= 0x10;
+                break;
+            case FrontendType::ANALOG_DEVICES:
+                // slow color pixel by pixel
+                reg04 |= 0x20;
+                break;
+            default:
+                throw SaneException("Invalid frontend type %d",
+                                    static_cast<unsigned>(dev->frontend.layout.type));
+        }
+    }
+
+    reg->set8(REG_0x04, reg04);
+
+    const auto& dpihw_sensor = sanei_genesys_find_sensor(dev, session.output_resolution,
+                                                         session.params.channels,
+                                                         session.params.scan_method);
+    sanei_genesys_set_dpihw(*reg, dpihw_sensor.register_dpihw);
+
+    if (should_enable_gamma(session, sensor)) {
+        reg->find_reg(REG_0x05).value |= REG_0x05_GMMENB;
+    } else {
+        reg->find_reg(REG_0x05).value &= ~REG_0x05_GMMENB;
+    }
+
+    reg->set16(REG_DPISET, sensor.register_dpiset);
+
+    reg->set16(REG_STRPIXEL, session.pixel_startx);
+    reg->set16(REG_ENDPIXEL, session.pixel_endx);
+
+    if (dev->model->is_cis) {
+        reg->set24(REG_MAXWD, session.output_line_bytes_raw * session.params.channels);
+    } else {
+        reg->set24(REG_MAXWD, session.output_line_bytes_raw);
+    }
+
+    unsigned tgtime = exposure / 65536 + 1;
+    reg->set16(REG_LPERIOD, exposure / tgtime);
+
+    reg->set8(REG_DUMMY, sensor.dummy_pixel);
+}
+
+void CommandSetGl842::init_regs_for_scan_session(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                                 Genesys_Register_Set* reg,
+                                                 const ScanSession& session) const
+{
+    DBG_HELPER(dbg);
+    session.assert_computed();
+
+    // we enable true gray for cis scanners only, and just when doing scan since color calibration
+    // is OK for this mode
+
+    int dummy = 0;
+
+  /* slope_dpi */
+  /* cis color scan is effectively a gray scan with 3 gray lines per color line and a FILTER of 0 */
+    int slope_dpi = 0;
+    if (dev->model->is_cis) {
+        slope_dpi = session.params.yres * session.params.channels;
+    } else {
+        slope_dpi = session.params.yres;
+    }
+    slope_dpi = slope_dpi * (1 + dummy);
+
+    int exposure = sensor.exposure_lperiod;
+    if (exposure < 0) {
+        throw std::runtime_error("Exposure not defined in sensor definition");
+    }
+    if (dev->model->model_id == ModelId::CANON_LIDE_90) {
+        exposure *= 2;
+    }
+    const auto& motor_profile = get_motor_profile(dev->motor.profiles, exposure, session);
+
+    // now _LOGICAL_ optical values used are known, setup registers
+    gl842_init_optical_regs_scan(dev, sensor, reg, exposure, session);
+    gl842_init_motor_regs_scan(dev, sensor, session, reg, motor_profile, exposure, slope_dpi,
+                               session.optical_line_count, dummy, session.params.starty,
+                               session.params.flags);
+
+    setup_image_pipeline(*dev, session);
+
+    dev->read_active = true;
+
+    dev->session = session;
+
+    dev->total_bytes_read = 0;
+    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+}
+
+ScanSession CommandSetGl842::calculate_scan_session(const Genesys_Device* dev,
+                                                    const Genesys_Sensor& sensor,
+                                                    const Genesys_Settings& settings) const
+{
+    DBG_HELPER(dbg);
+    debug_dump(DBG_info, settings);
+
+    ScanFlag flags = ScanFlag::NONE;
+
+    float move = 0.0f;
+    if (settings.scan_method == ScanMethod::TRANSPARENCY ||
+        settings.scan_method == ScanMethod::TRANSPARENCY_INFRARED)
+    {
+        // note: scanner_move_to_ta() function has already been called and the sensor is at the
+        // transparency adapter
+        if (!dev->ignore_offsets) {
+            move = dev->model->y_offset_ta - dev->model->y_offset_sensor_to_ta;
+        }
+        flags |= ScanFlag::USE_XPA;
+    } else {
+        if (!dev->ignore_offsets) {
+            move = dev->model->y_offset;
+        }
+    }
+
+    move += settings.tl_y;
+
+    int move_dpi = dev->motor.base_ydpi;
+    move = static_cast<float>((move * move_dpi) / MM_PER_INCH);
+
+    float start = 0.0f;
+    if (settings.scan_method==ScanMethod::TRANSPARENCY ||
+        settings.scan_method == ScanMethod::TRANSPARENCY_INFRARED)
+    {
+        start = dev->model->x_offset_ta;
+    } else {
+        start = dev->model->x_offset;
+    }
+    start = start + settings.tl_x;
+
+    start = static_cast<float>((start * settings.xres) / MM_PER_INCH);
+
+    ScanSession session;
+    session.params.xres = settings.xres;
+    session.params.yres = settings.yres;
+    session.params.startx = static_cast<unsigned>(start);
+    session.params.starty = static_cast<unsigned>(move);
+    session.params.pixels = settings.pixels;
+    session.params.requested_pixels = settings.requested_pixels;
+    session.params.lines = settings.lines;
+    session.params.depth = settings.depth;
+    session.params.channels = settings.get_channels();
+    session.params.scan_method = settings.scan_method;
+    session.params.scan_mode = settings.scan_mode;
+    session.params.color_filter = settings.color_filter;
+    session.params.flags = flags;
+    compute_session(dev, session, sensor);
+
+    return session;
+}
+
+void CommandSetGl842::save_power(Genesys_Device* dev, bool enable) const
+{
+    (void) dev;
+    DBG_HELPER_ARGS(dbg, "enable = %d", enable);
+}
+
+void CommandSetGl842::set_powersaving(Genesys_Device* dev, int delay /* in minutes */) const
+{
+    (void) dev;
+    DBG_HELPER_ARGS(dbg, "delay = %d", delay);
+}
+
+void CommandSetGl842::eject_document(Genesys_Device* dev) const
+{
+    (void) dev;
+    DBG_HELPER(dbg);
+}
+
+
+void CommandSetGl842::load_document(Genesys_Device* dev) const
+{
+    DBG_HELPER(dbg);
+    (void) dev;
+}
+
+void CommandSetGl842::detect_document_end(Genesys_Device* dev) const
+{
+    DBG_HELPER(dbg);
+    (void) dev;
+    throw SaneException(SANE_STATUS_UNSUPPORTED);
+}
+
+// Send the low-level scan command
+void CommandSetGl842::begin_scan(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                 Genesys_Register_Set* reg, bool start_motor) const
+{
+    DBG_HELPER(dbg);
+    (void) sensor;
+
+    if (reg->state.is_xpa_on && reg->state.is_lamp_on &&
+        !has_flag(dev->model->flags, ModelFlag::TA_NO_SECONDARY_LAMP))
+    {
+        dev->cmd_set->set_xpa_lamp_power(*dev, true);
+    }
+    if (reg->state.is_xpa_on && !has_flag(dev->model->flags, ModelFlag::UTA_NO_SECONDARY_MOTOR)) {
+        dev->cmd_set->set_motor_mode(*dev, *reg, MotorMode::PRIMARY_AND_SECONDARY);
+    }
+
+    if (dev->model->model_id == ModelId::CANON_LIDE_90) {
+        if (has_flag(dev->session.params.flags, ScanFlag::REVERSE)) {
+            dev->interface->write_register(REG_0x6B, 0x01);
+            dev->interface->write_register(REG_0x6C, 0x02);
+        } else {
+            dev->interface->write_register(REG_0x6B, 0x03);
+            switch (dev->session.params.xres) {
+                case 150: dev->interface->write_register(REG_0x6C, 0x74); break;
+                case 300: dev->interface->write_register(REG_0x6C, 0x38); break;
+                case 600: dev->interface->write_register(REG_0x6C, 0x1c); break;
+                case 1200: dev->interface->write_register(REG_0x6C, 0x2c); break;
+                case 2400: dev->interface->write_register(REG_0x6C, 0x0c); break;
+                default:
+                    break;
+            }
+        }
+        dev->interface->sleep_ms(100);
+    }
+
+    scanner_clear_scan_and_feed_counts(*dev);
+
+    // enable scan and motor
+    std::uint8_t val = dev->interface->read_register(REG_0x01);
+    val |= REG_0x01_SCAN;
+    dev->interface->write_register(REG_0x01, val);
+
+    scanner_start_action(*dev, start_motor);
+
+    switch (reg->state.motor_mode) {
+        case MotorMode::PRIMARY: {
+            if (reg->state.is_motor_on) {
+                dev->advance_head_pos_by_session(ScanHeadId::PRIMARY);
+            }
+            break;
+        }
+        case MotorMode::PRIMARY_AND_SECONDARY: {
+            if (reg->state.is_motor_on) {
+                dev->advance_head_pos_by_session(ScanHeadId::PRIMARY);
+                dev->advance_head_pos_by_session(ScanHeadId::SECONDARY);
+            }
+            break;
+        }
+        case MotorMode::SECONDARY: {
+            if (reg->state.is_motor_on) {
+                dev->advance_head_pos_by_session(ScanHeadId::SECONDARY);
+            }
+            break;
+        }
+    }
+}
+
+void CommandSetGl842::end_scan(Genesys_Device* dev, Genesys_Register_Set* reg,
+                               bool check_stop) const
+{
+    DBG_HELPER_ARGS(dbg, "check_stop = %d", check_stop);
+
+    if (reg->state.is_xpa_on) {
+        dev->cmd_set->set_xpa_lamp_power(*dev, false);
+    }
+
+    if (!dev->model->is_sheetfed) {
+        scanner_stop_action(*dev);
+    }
+}
+
+void CommandSetGl842::move_back_home(Genesys_Device* dev, bool wait_until_home) const
+{
+    scanner_move_back_home(*dev, wait_until_home);
+}
+
+void CommandSetGl842::init_regs_for_shading(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                            Genesys_Register_Set& regs) const
+{
+    DBG_HELPER(dbg);
+    int move;
+
+    float calib_size_mm = 0;
+    if (dev->settings.scan_method == ScanMethod::TRANSPARENCY ||
+        dev->settings.scan_method == ScanMethod::TRANSPARENCY_INFRARED)
+    {
+        calib_size_mm = dev->model->y_size_calib_ta_mm;
+    } else {
+        calib_size_mm = dev->model->y_size_calib_mm;
+    }
+
+    unsigned resolution = sensor.shading_resolution;
+
+    unsigned channels = 3;
+    const auto& calib_sensor = sanei_genesys_find_sensor(dev, resolution, channels,
+                                                         dev->settings.scan_method);
+
+    unsigned calib_pixels = 0;
+    unsigned calib_pixels_offset = 0;
+
+    if (should_calibrate_only_active_area(*dev, dev->settings)) {
+        float offset = dev->model->x_offset_ta;
+        // FIXME: we should use resolution here
+        offset = static_cast<float>((offset * dev->settings.xres) / MM_PER_INCH);
+
+        float size = dev->model->x_size_ta;
+        size = static_cast<float>((size * dev->settings.xres) / MM_PER_INCH);
+
+        calib_pixels_offset = static_cast<std::size_t>(offset);
+        calib_pixels = static_cast<std::size_t>(size);
+    } else {
+        calib_pixels_offset = 0;
+        calib_pixels = dev->model->x_size_calib_mm * resolution / MM_PER_INCH;
+    }
+
+    ScanFlag flags = ScanFlag::DISABLE_SHADING |
+                     ScanFlag::DISABLE_GAMMA |
+                     ScanFlag::DISABLE_BUFFER_FULL_MOVE;
+
+    if (dev->settings.scan_method == ScanMethod::TRANSPARENCY ||
+        dev->settings.scan_method == ScanMethod::TRANSPARENCY_INFRARED)
+    {
+        // note: scanner_move_to_ta() function has already been called and the sensor is at the
+        // transparency adapter
+        move = static_cast<int>(dev->model->y_offset_calib_white_ta -
+                                dev->model->y_offset_sensor_to_ta);
+        flags |= ScanFlag::USE_XPA;
+    } else {
+        move = static_cast<int>(dev->model->y_offset_calib_white);
+    }
+
+    move = static_cast<int>((move * resolution) / MM_PER_INCH);
+    unsigned calib_lines = static_cast<unsigned>(calib_size_mm * resolution / MM_PER_INCH);
+
+    ScanSession session;
+    session.params.xres = resolution;
+    session.params.yres = resolution;
+    session.params.startx = calib_pixels_offset;
+    session.params.starty = move;
+    session.params.pixels = calib_pixels;
+    session.params.lines = calib_lines;
+    session.params.depth = 16;
+    session.params.channels = channels;
+    session.params.scan_method = dev->settings.scan_method;
+    session.params.scan_mode = dev->settings.scan_mode;
+    session.params.color_filter = dev->settings.color_filter;
+    session.params.flags = flags;
+    compute_session(dev, session, calib_sensor);
+
+    init_regs_for_scan_session(dev, calib_sensor, &regs, session);
+
+    dev->calib_session = session;
+}
+
+void CommandSetGl842::send_gamma_table(Genesys_Device* dev, const Genesys_Sensor& sensor) const
+{
+    DBG_HELPER(dbg);
+
+    if (dev->model->model_id == ModelId::PLUSTEK_OPTICFILM_7200)
+        return; // No gamma on this model
+
+    unsigned size = 256;
+
+    std::vector<uint8_t> gamma(size * 2 * 3);
+
+    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);
+
+    // copy sensor specific's gamma tables
+    for (unsigned i = 0; i < size; i++) {
+        gamma[i * 2 + size * 0 + 0] = rgamma[i] & 0xff;
+        gamma[i * 2 + size * 0 + 1] = (rgamma[i] >> 8) & 0xff;
+        gamma[i * 2 + size * 2 + 0] = ggamma[i] & 0xff;
+        gamma[i * 2 + size * 2 + 1] = (ggamma[i] >> 8) & 0xff;
+        gamma[i * 2 + size * 4 + 0] = bgamma[i] & 0xff;
+        gamma[i * 2 + size * 4 + 1] = (bgamma[i] >> 8) & 0xff;
+    }
+
+    dev->interface->write_gamma(0x28, 0x0000, gamma.data(), size * 2 * 3);
+}
+
+SensorExposure CommandSetGl842::led_calibration(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                                Genesys_Register_Set& regs) const
+{
+    return scanner_led_calibration(*dev, sensor, regs);
+}
+
+void CommandSetGl842::offset_calibration(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                         Genesys_Register_Set& regs) const
+{
+    scanner_offset_calibration(*dev, sensor, regs);
+}
+
+void CommandSetGl842::coarse_gain_calibration(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                              Genesys_Register_Set& regs, int dpi) const
+{
+    scanner_coarse_gain_calibration(*dev, sensor, regs, dpi);
+}
+
+void CommandSetGl842::init_regs_for_warmup(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                           Genesys_Register_Set* reg) const
+{
+    DBG_HELPER(dbg);
+    (void) sensor;
+
+    unsigned channels = 3;
+    unsigned resolution = dev->model->get_resolution_settings(dev->settings.scan_method)
+                                     .get_nearest_resolution_x(600);
+
+    const auto& calib_sensor = sanei_genesys_find_sensor(dev, resolution, channels,
+                                                         dev->settings.scan_method);
+    unsigned num_pixels = dev->model->x_size_calib_mm * resolution / MM_PER_INCH / 2;
+
+    *reg = dev->reg;
+
+    auto flags = ScanFlag::DISABLE_SHADING |
+                 ScanFlag::DISABLE_GAMMA |
+                 ScanFlag::SINGLE_LINE |
+                 ScanFlag::IGNORE_STAGGER_OFFSET |
+                 ScanFlag::IGNORE_COLOR_OFFSET;
+    if (dev->settings.scan_method == ScanMethod::TRANSPARENCY ||
+        dev->settings.scan_method == ScanMethod::TRANSPARENCY_INFRARED)
+    {
+        flags |= ScanFlag::USE_XPA;
+    }
+
+    ScanSession session;
+    session.params.xres = resolution;
+    session.params.yres = resolution;
+    session.params.startx = (num_pixels / 2) * resolution / calib_sensor.full_resolution;
+    session.params.starty = 0;
+    session.params.pixels = num_pixels;
+    session.params.lines = 1;
+    session.params.depth = dev->model->bpp_color_values.front();
+    session.params.channels = channels;
+    session.params.scan_method = dev->settings.scan_method;
+    session.params.scan_mode = ScanColorMode::COLOR_SINGLE_PASS;
+    session.params.color_filter = dev->settings.color_filter;
+    session.params.flags = flags;
+
+    compute_session(dev, session, calib_sensor);
+
+    init_regs_for_scan_session(dev, calib_sensor, reg, session);
+
+    sanei_genesys_set_motor_power(*reg, false);
+}
+
+static void gl842_init_gpio(Genesys_Device* dev)
+{
+    DBG_HELPER(dbg);
+    apply_registers_ordered(dev->gpo.regs, { 0x6e, 0x6f }, [&](const GenesysRegisterSetting& reg)
+    {
+        dev->interface->write_register(reg.address, reg.value);
+    });
+}
+
+void CommandSetGl842::asic_boot(Genesys_Device* dev, bool cold) const
+{
+    DBG_HELPER(dbg);
+
+    if (cold) {
+        dev->interface->write_register(0x0e, 0x01);
+        dev->interface->write_register(0x0e, 0x00);
+    }
+
+    // setup initial register values
+    gl842_init_registers(*dev);
+    dev->interface->write_registers(dev->reg);
+
+    if (dev->model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        uint8_t data[32] = {
+            0xd0, 0x38, 0x07, 0x00, 0x01, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x6a, 0x73, 0x63, 0x68, 0x69, 0x65, 0x6e, 0x00,
+        };
+
+        dev->interface->write_buffer(0x3c, 0x010a00, data, 32);
+    }
+
+    if (dev->model->model_id == ModelId::PLUSTEK_OPTICFILM_7200) {
+        dev->interface->write_0x8c(0x10, 0x94);
+    }
+    if (dev->model->model_id == ModelId::CANON_LIDE_90) {
+        dev->interface->write_0x8c(0x10, 0xd4);
+    }
+
+    // set RAM read address
+    dev->interface->write_register(REG_0x2A, 0x00);
+    dev->interface->write_register(REG_0x2B, 0x00);
+
+    // setup gpio
+    gl842_init_gpio(dev);
+    dev->interface->sleep_ms(100);
+}
+
+void CommandSetGl842::init(Genesys_Device* dev) const
+{
+    DBG_INIT();
+    DBG_HELPER(dbg);
+
+    sanei_genesys_asic_init(dev);
+}
+
+void CommandSetGl842::update_hardware_sensors(Genesys_Scanner* s) const
+{
+    DBG_HELPER(dbg);
+    (void) s;
+}
+
+void CommandSetGl842::update_home_sensor_gpio(Genesys_Device& dev) const
+{
+    DBG_HELPER(dbg);
+    if (dev.model->model_id == ModelId::CANON_LIDE_90) {
+        std::uint8_t val = dev.interface->read_register(REG_0x6C);
+        val |= 0x02;
+        dev.interface->write_register(REG_0x6C, val);
+    }
+}
+
+/**
+ * Send shading calibration data. The buffer is considered to always hold values
+ * for all the channels.
+ */
+void CommandSetGl842::send_shading_data(Genesys_Device* dev, const Genesys_Sensor& sensor,
+                                        uint8_t* data, int size) const
+{
+    DBG_HELPER(dbg);
+
+    int offset = 0;
+    unsigned length = size;
+
+    if (dev->reg.get8(REG_0x01) & REG_0x01_SHDAREA) {
+        offset = dev->session.params.startx * sensor.shading_resolution /
+                 dev->session.params.xres;
+
+        length = dev->session.output_pixels * sensor.shading_resolution /
+                 dev->session.params.xres;
+
+        offset += sensor.shading_pixel_offset;
+
+        // 16 bit words, 2 words per color, 3 color channels
+        length *= 2 * 2 * 3;
+        offset *= 2 * 2 * 3;
+    } else {
+        offset += sensor.shading_pixel_offset * 2 * 2 * 3;
+    }
+
+    dev->interface->record_key_value("shading_offset", std::to_string(offset));
+    dev->interface->record_key_value("shading_length", std::to_string(length));
+
+    std::vector<uint8_t> final_data(length, 0);
+
+    unsigned count = 0;
+    if (offset < 0) {
+        count += (-offset);
+        length -= (-offset);
+        offset = 0;
+    }
+    if (static_cast<int>(length) + offset > static_cast<int>(size)) {
+        length = size - offset;
+    }
+
+    for (unsigned i = 0; i < length; i++) {
+        final_data[count++] = data[offset + i];
+        count++;
+    }
+
+    dev->interface->write_buffer(0x3c, 0, final_data.data(), count);
+}
+
+bool CommandSetGl842::needs_home_before_init_regs_for_scan(Genesys_Device* dev) const
+{
+    (void) dev;
+    return true;
+}
+
+void CommandSetGl842::wait_for_motor_stop(Genesys_Device* dev) const
+{
+    (void) dev;
+}
+
+} // namespace gl842
+} // namespace genesys