#!/usr/bin/perl

#    mkpatch - Create patches against the Linux kernel
#    Copyright (c) 1999  Frodo Looijaard <frodol@dds.nl>
#
#    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., 675 Mass Ave, Cambridge, MA 02139, USA.

use strict;

use vars qw($temp);
$temp = "mkpatch/.temp";

# Generate a diff between the old kernel file and the new I2C file. We
# arrange the headers to tell us the old tree was under directory
# `linux-old', and the new tree under `linux'.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
# $_[2]: Name of the kernel file
# $_[3]: Name of the patched file
sub print_diff
{
  my ($package_root,$kernel_root,$kernel_file,$package_file) = @_;
  my ($diff_command,$dummy);

  $diff_command = "diff -u2";
  if ( -e "$kernel_root/$kernel_file") {
    $diff_command .= " $kernel_root/$kernel_file ";
  } else {
    $diff_command .= " /dev/null ";
  }
  if ( -e "$package_root/$package_file") {
    $diff_command .= " $package_root/$package_file ";
  } else {
    $diff_command .= " /dev/null";
  }
  open INPUT, "$diff_command|" or die "Can't execute `$diff_command'";
  $dummy = <INPUT>;
  $dummy = <INPUT>;
  print "--- linux-old/$kernel_file\t".`date`;
  print "+++ linux/$kernel_file\t".`date`;
    
  while (<INPUT>) {
    print;
  }
  close INPUT;
}

# This generates diffs for kernel file Documentation/Configure.help. This
# file contains the help texts that can be displayed during `make *config'
# for the kernel.
# The new texts are put at the end of the file, or just before the
# lm_sensors texts.
# Of course, care is taken old lines are removed.
# $_[0]: i2c package root (like /tmp/i2c)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_Documentation_Configure_help
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "Documentation/Configure.help";
  my $package_file = $temp;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if (m@I2C mainboard interfaces@ or 
           m@Acer Labs ALI 1533 and 1543C@ or
           m@Apple Hydra Mac I/O@ or
           m@Intel 82371AB PIIX4\(E\)@ or
           m@VIA Technologies, Inc. VT82C586B@ or
           m@Pseudo ISA adapter \(for hardware sensors modules\)@ or
           m@Analog Devices ADM1021 and compatibles@ or
           m@Analog Devices ADM9240 and compatibles@ or
           m@Genesys Logic GL518SM@ or
           m@National Semiconductors LM75@ or
           m@National Semiconductors LM78@ or
           m@National Semiconductors LM80@ or
           m@Silicon Integrated Systems Corp. SiS5595@ or
           m@Winbond W83781D, W83782D and W83783S@ or
           m@EEprom \(DIMM\) reader@ or
           m@Linear Technologies LTC1710@) {
      $_ = <INPUT>;
      $_ = <INPUT>;
      $_ = <INPUT> while not m@^\S@ and not eof(INPUT);
      redo MAIN;
    }
    if (eof(INPUT)) {
      print OUTPUT <<'EOF'
I2C mainboard interfaces
CONFIG_I2C_MAINBOARD
  Many modern mainboards have some kind of I2C interface integrated. This
  is often in the form of a SMBus, or System Management Bus, which is
  basically the same as I2C but which uses only a subset of the I2C
  protocol.

  You will also want the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Acer Labs ALI 1533 and 1543C
CONFIG_I2C_ALI15X3
  If you say yes to this option, support will be included for the Acer
  Labs ALI 1533 and 1543C mainboard I2C interfaces. This can also be 
  built as a module which can be inserted and removed while the kernel
  is running.

Apple Hydra Mac I/O
CONFIG_I2C_HYDRA
  If you say yes to this option, support will be included for the 
  Hydra mainboard I2C interface. This can also be built as a module 
  which can be inserted and removed while the kernel is running.

Intel 82371AB PIIX4(E)
CONFIG_I2C_PIIX4
  If you say yes to this option, support will be included for the 
  Intel PIIX4 and PIIX4E mainboard I2C interfaces. This can also be
  built as a module which can be inserted and removed while the kernel
  is running.

VIA Technologies, Inc. VT82C586B
CONFIG_I2C_VIA
  If you say yes to this option, support will be included for the VIA
  Technologies I2C adapter found on some motherboards. This can also 
  be built as a module which can be inserted and removed while the 
  kernel is running.

Pseudo ISA adapter (for hardware sensors modules)
CONFIG_I2C_ISA
  This provides support for accessing some hardware sensor chips over
  the ISA bus rather than the I2C or SMBus. If you want to do this, 
  say yes here. This feature can also be built as a module which can 
  be inserted and removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Analog Devices ADM1021 and compatibles
CONFIG_SENSORS_ADM1021 
  If you say yes here you get support for Analog Devices ADM1021 
  sensor chips and clones: the Maxim MAX1617 and MAX1617A, the
  TI THMC10 and the XEON processor built-in sensor. This can also 
  be built as a module which can be inserted and removed while the 
  kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Analog Devices ADM9240 and compatibles
CONFIG_SENSORS_ADM9240
  If you say yes here you get support for Analog Devices ADM9240 
  sensor chips and clones: the Dallas Semiconductors DS1780 and
  the National Semiconductors LM81. This can also be built as a 
  module which can be inserted and removed while the kernel is
  running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Genesys Logic GL518SM
CONFIG_SENSORS_GL518SM
  If you say yes here you get support for Genesys Logic GL518SM sensor
  chips.  This can also be built as a module which can be inserted and
  removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

National Semiconductors LM75
CONFIG_SENSORS_LM75 
  If you say yes here you get support for National Semiconductor LM75
  sensor chips. This can also be built as a module which can be
  inserted and removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

National Semiconductors LM78
CONFIG_SENSORS_LM78
  If you say yes here you get support for National Semiconductor LM78
  sensor chips family: the LM78-J and LM79. Many clone chips will
  also work at least somewhat with this driver. This can also be built
  as a module which can be inserted and removed while the kernel is 
  running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

National Semiconductors LM80
CONFIG_SENSORS_LM80
  If you say yes here you get support for National Semiconductor LM80
  sensor chips. This can also be built as a module which can be 
  inserted and removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Silicon Integrated Systems Corp. SiS5595
CONFIG_SENSORS_SIS5595
  If you say yes here you get support for Silicon Integrated Systems 
  Corp.  SiS5595 sensor chips. This can also be built as a module 
  which can be inserted and removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Winbond W83781D, W83782D and W83783S
CONFIG_SENSORS_W83781D
  If you say yes here you get support for the Winbond W8378x series 
  of sensor chips: the W83781D, W83782D, W83783S and W83682HF. This 
  can also be built as a module which can be inserted and removed
  while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

EEprom (DIMM) reader
CONFIG_SENSORS_EEPROM
  If you say yes here you get read-only access to the EEPROM data 
  available on modern memory DIMMs, and which could theoretically
  also be available on other devices. This can also be built as a 
  module which can be inserted and removed while the kernel is 
  running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

Linear Technologies LTC1710
CONFIG_SENSORS_LTC1710
  If you say yes here you get support for Linear Technologies LTC1710
  sensor chips. This can also be built as a module which can be 
  inserted and removed while the kernel is running.

  You will also need the latest user-space utilties: you can find them
  in the lm_sensors package, which you can download at 
  http://www.lm-sensors.nu

EOF
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}


# This generates diffs for the main Linux Makefile.
# Three lines which add drivers/sensors/sensors.a to the DRIVERS list are 
# put just before the place where the architecture Makefile is included.
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_Makefile
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "Makefile";
  my $package_file = $temp;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if (m@CONFIG_SENSORS@) {
      $_ = <INPUT> while not m@endif@;
      $_ = <INPUT>;
      $_ = <INPUT> if m@^$@;
      redo MAIN;
    }
    if (m@include arch/\$\(ARCH\)/Makefile@) {
      print OUTPUT <<'EOF';
ifeq ($(CONFIG_SENSORS),y)
DRIVERS := $(DRIVERS) drivers/sensors/sensors.a
endif

EOF
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}

# This generates diffs for drivers/Makefile
# First, `sensors' is added to the ALL_SUB_DIRS list. Next, a couple of lines
# to add sensors to the SUB_DIRS and/or MOD_SUB_DIRS lists is put right before
# Rules.make is included.
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_Makefile
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/Makefile";
  my $package_file = $temp;
  my $sensors_present;
  my $pr1 = 0;
  my $pr2 = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if (m@^ALL_SUB_DIRS\s*:=@) {
      $pr1 = 1;
      $sensors_present = 0;
      while (m@\\$@) {
        $sensors_present = 1 if m@sensors@;
        print OUTPUT;
        $_ = <INPUT>;
      }
      $sensors_present = 1 if m@sensors@;
      s@$@ sensors@ if (not $sensors_present);
      print OUTPUT;
      $_ = <INPUT>;
      redo MAIN;
    } 
    if (m@CONFIG_SENSORS@) {
      $_ = <INPUT> while not m@^endif@;
      $_ = <INPUT>;
      $_ = <INPUT> if m@^$@;
      redo MAIN;
    } 
    if (m@^include \$\(TOPDIR\)/Rules.make$@) {
      $pr2 = 1;
      print OUTPUT <<'EOF';
ifeq ($(CONFIG_SENSORS),y)
SUB_DIRS += sensors
MOD_SUB_DIRS += sensors
else
  ifeq ($(CONFIG_SENSORS),m)
  MOD_SUB_DIRS += sensors
  endif
endif

EOF
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/Makefile' failed.\n".
      "Contact the authors please!" if $pr1 == 0 or $pr2 == 0;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}

# This generates diffs for drivers/char/Config.in
# It adds a line just before CONFIG_APM or main_menu_option lines to include
# the sensors Config.in.
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_char_Config_in
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/char/Config.in";
  my $package_file = $temp;
  my $pr1 = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if (m@source drivers/i2c/Config.in@) {
      $pr1 = 1;
      print OUTPUT;
      print OUTPUT "\nsource drivers/sensors/Config.in\n";
      $_ = <INPUT>;
      redo MAIN;
    }
    if (m@sensors@) {
      $_ = <INPUT>;
      $_ = <INPUT> if m@^$@;
      redo MAIN;
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/Makefile' failed.\n".
      "Contact the authors please!" if $pr1 == 0;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}
 

# This generates diffs for drivers/char/mem.c They are a bit intricate.
# Lines are generated at the beginning to declare sensors_init_all
# At the bottom, a call to sensors_init_all is added when the
# new lm_sensors stuff is configured in.
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_char_mem_c
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/char/mem.c";
  my $package_file = $temp;
  my $right_place = 0;
  my $done = 0;
  my $atstart = 1;
  my $pr1 = 0;
  my $pr2 = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if ($atstart and m@#ifdef@) {
      $pr1 = 1;
      print OUTPUT << 'EOF';
#ifdef CONFIG_SENSORS
extern void sensors_init_all(void);
#endif
EOF
      $atstart = 0;
    }
    if (not $right_place and m@CONFIG_SENSORS@) {
      $_ = <INPUT> while not m@#endif@;
      $_ = <INPUT>;
      redo MAIN;
    }
    $right_place = 1 if (m@lp_init\(\);@);
    if ($right_place and not $done and
        m@CONFIG_SENSORS@) {
      $_ = <INPUT> while not m@#endif@;
      $_ = <INPUT>;
      $_ = <INPUT> if m@^$@;
      redo MAIN;
    }
    if ($right_place and not $done and m@return 0;@) {
      $pr2 = 1;
      print OUTPUT <<'EOF';
#ifdef CONFIG_SENSORS
	sensors_init_all();
#endif

EOF
      $done = 1;
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/char/mem.c' failed.\n".
      "Contact the authors please!" if $pr1 == 0 or $pr2 == 0;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}


# This generates diffs for drivers/i2c/Config.in
# Several adapter drivers that are included in the lm_sensors package are
# added at the first and onlu sensors marker.
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_i2c_Config_in
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/i2c/Config.in";
  my $package_file = "$temp";
  my $pr1 = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  while(<INPUT>) {
    if (m@sensors code starts here@) {
      $pr1++;
      print OUTPUT;
      while (<INPUT>) {
        last if m@sensors code ends here@;
      }
      print OUTPUT << 'EOF';
  bool 'I2C mainboard interfaces' CONFIG_I2C_MAINBOARD 
  if [ "$CONFIG_I2C_MAINBOARD" = "y" ]; then
    tristate '  Acer Labs ALI 1533 and 1543C' CONFIG_I2C_ALI15X3 
    dep_tristate '  Apple Hydra Mac I/O' CONFIG_I2C_HYDRA $CONFIG_I2C_ALGOBIT
    tristate '  Intel 82371AB PIIX4(E)' CONFIG_I2C_PIIX4
    dep_tristate '  VIA Technologies, Inc. VT82C586B' CONFIG_I2C_VIA $CONFIG_I2C_ALGOBIT
    tristate '  Pseudo ISA adapter (for hardware sensors modules)' CONFIG_I2C_ISA 
  fi

EOF
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/i2c/Config.in' failed.\n".
      "Contact the authors please!" if $pr1 != 1;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}

# This generates diffs for drivers/i2c/Makefile.
# Lines to add correct files to M_OBJS and/or L_OBJS are added just before
# Rules.make is included
# Of course, care is taken old lines are removed.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_i2c_Makefile
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/i2c/Makefile";
  my $package_file = $temp;
  my $pr1 = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  while(<INPUT>) {
    if (m@sensors code starts here@) {
      $pr1 ++;
      print OUTPUT;
      while (<INPUT>) {
        last if m@sensors code ends here@;
      }
      print OUTPUT << 'EOF';
ifeq ($(CONFIG_I2C_ALI15X3),y)
  L_OBJS += i2c-ali15x3.o
else 
  ifeq ($(CONFIG_I2C_ALI15X3),m)
    M_OBJS += i2c-ali15x3.o
  endif
endif

ifeq ($(CONFIG_I2C_HYDRA),y)
  L_OBJS += i2c-hydra.o
else 
  ifeq ($(CONFIG_I2C_HYDRA),m)
    M_OBJS += i2c-hydra.o
  endif
endif

ifeq ($(CONFIG_I2C_PIIX4),y)
  L_OBJS += i2c-piix4.o
else 
  ifeq ($(CONFIG_I2C_PIIX4),m)
    M_OBJS += i2c-piix4.o
  endif
endif

ifeq ($(CONFIG_I2C_VIA),y)
  L_OBJS += i2c-via.o
else 
  ifeq ($(CONFIG_I2C_VIA),m)
    M_OBJS += i2c-via.o
  endif
endif

ifeq ($(CONFIG_I2C_ISA),y)
  L_OBJS += i2c-isa.o
else 
  ifeq ($(CONFIG_I2C_ISA),m)
    M_OBJS += i2c-isa.o
  endif
endif

EOF
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/i2c/Makefile' failed.\n".
      "Contact the authors please!" if $pr1 != 1;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}

# This generates diffs for drivers/i2c/i2c-core.c
# Lines are generated at the beginning to declare several *_init functions.
# At the bottom, calls to them are added when the sensors stuff is configured
# in.
# $_[0]: sensors package root (like /tmp/sensors)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_drivers_i2c_i2c_core_c
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "drivers/i2c/i2c-core.c";
  my $package_file = $temp;
  my $patch_nr = 1;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  while(<INPUT>) {
    if (m@sensors code starts here@) {
      print OUTPUT;
      while (<INPUT>) {
        last if m@sensors code ends here@;
      }
      if ($patch_nr == 1) {
        print OUTPUT << 'EOF';
#ifdef CONFIG_I2C_ALI15X3
	extern int i2c_ali15x3_init(void);
#endif
#ifdef CONFIG_I2C_HYDRA
	extern int i2c_hydra_init(void);
#endif
#ifdef CONFIG_I2C_PIIX4
	extern int i2c_piix4_init(void);
#endif
#ifdef CONFIG_I2C_VIA
	extern int i2c_via_init(void);
#endif
#ifdef CONFIG_I2C_ISA
	extern int i2c_isa_init(void);
#endif
EOF
      } elsif ($patch_nr == 2) {
      print OUTPUT << 'EOF';
#ifdef CONFIG_I2C_ALI15X3
	i2c_ali15x3_init();
#endif
#ifdef CONFIG_I2C_HYDRA
	i2c_hydra_init();
#endif
#ifdef CONFIG_I2C_PIIX4
	i2c_piix4_init();
#endif
#ifdef CONFIG_I2C_VIA
	i2c_via_init();
#endif
#ifdef CONFIG_I2C_ISA
	i2c_isa_init();
#endif
EOF
      }
      $patch_nr ++;
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `drivers/i2c/i2c-core.c' failed.\n".
      "Contact the authors please!" if $patch_nr != 3;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}

# Generate the diffs for the list of MAINTAINERS
# $_[0]: i2c package root (like /tmp/i2c)
# $_[1]: Linux kernel tree (like /usr/src/linux)
sub gen_MAINTAINERS
{
  my ($package_root,$kernel_root) = @_;
  my $kernel_file = "MAINTAINERS";
  my $package_file = $temp;
  my $done = 0;

  open INPUT,"$kernel_root/$kernel_file"
        or die "Can't open `$kernel_root/$kernel_file'";
  open OUTPUT,">$package_root/$package_file"
        or die "Can't open $package_root/$package_file";
  MAIN: while(<INPUT>) {
    if (m@SENSORS DRIVERS@) {
       $_=<INPUT> while not m@^$@;
       $_=<INPUT>;
       redo MAIN;
    }
    if (not $done and (m@SGI VISUAL WORKSTATION 320 AND 540@)) {
      print OUTPUT <<'EOF';
SENSORS DRIVERS
P:      Frodo Looijaard
M:      frodol@dds.nl
P:	Philip Edelbrock
M:	phil@netroedge.com
L:      lm78@stimpy.netroedge.com
W:      http://www.lm-sensors.nu/
S:      Maintained

EOF
      $done = 1;
    }
    print OUTPUT;
  }
  close INPUT;
  close OUTPUT;
  die "Automatic patch generation for `MAINTAINERS' failed.\n".
      "Contact the authors please!" if $done == 0;
  print_diff $package_root,$kernel_root,$kernel_file,$package_file;
}


# Main function
sub main
{
  my ($package_root,$kernel_root,%files,%includes,$package_file,$kernel_file);
  my ($diff_command,$dummy,$data0,$data1,$sedscript,$version_string);

  # --> Read the command-lineo
  $package_root = $ARGV[0];
  die "Package root `$package_root' is not found\n" 
        unless -d "$package_root/mkpatch";
  $kernel_root = $ARGV[1];
  die "Kernel root `$kernel_root' is not found\n" 
        unless -f "$kernel_root/Rules.make";

  # --> Read FILES
  open INPUT, "$package_root/mkpatch/FILES" 
        or die "Can't open `$package_root/mkpatch/FILES'";
  while (<INPUT>) {
    ($data0,$data1) = /(\S+)\s+(\S+)/;
    $files{$data0} = $data1;
  } 
  close INPUT;

  # --> Read INCLUDES
  open INPUT, "$package_root/mkpatch/INCLUDES" 
        or die "Can't open `$package_root/mkpatch/INCLUDES'";
  while (<INPUT>) {
    ($data0,$data1) = /(\S+)\s+(\S+)/;
    $includes{$data0} = $data1;
    $sedscript .= 's,(#\s*include\s*)'.$data0.'(\s*),\1'."$data1".'\2, ; ';
  } 
  close INPUT;

  die "First apply the i2c patches to `$kernel_root'!" 
       if ! -d "$kernel_root/drivers/i2c";

  # --> Read "version.h"
  open INPUT, "$package_root/version.h"
        or die "Can't open `$package_root/version.h'";
  $version_string .= $_ while <INPUT>;
  close INPUT;
 
  # --> Start generating
  foreach $package_file (sort keys %files) {
    open INPUT,"$package_root/$package_file" 
          or die "Can't open `$package_root/$package_file'";
    open OUTPUT,">$package_root/$temp"
          or die "Can't open `$package_root/$temp'";
    while (<INPUT>) {
      eval $sedscript;
      if (m@#\s*include\s*"version.h"@) {
        print OUTPUT $version_string;
      } elsif (m@#\s*include\s*"compat.h"@) {
        print OUTPUT << 'EOF';

/* --> COMPATIBILITY SECTION FOR OLD (2.0, 2.1) KERNELS */

#ifdef MODULE
#include <linux/module.h>
#endif /* def MODULE */
#ifndef MODULE_AUTHOR
#define MODULE_AUTHOR(noone)
#endif
#ifndef MODULE_DESCRIPTION
#define MODULE_DESCRIPTION(none)
#endif
#ifndef MODULE_PARM
#define MODULE_PARM(no,param)
#endif
#ifndef MODULE_PARM_DESC
#define MODULE_PARM_DESC(no,description)
#endif /* def MODULE */

EOF

        if (`grep THIS_MODULE "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,13)
/* This is safe, because we won't use it for any kernels below 2.3.27 */
#define THIS_MODULE NULL
#endif

EOF
        }
        if (`grep KERNEL_VERSION "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#include <linux/version.h>
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) | ((b) << 8) | (c))
#endif

EOF
        }
	if (`grep EXPORT_NO_SYMBOLS "$package_root/$package_file"`) {
	  print OUTPUT << 'EOF';
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
#define EXPORT_NO_SYMBOLS
#endif

EOF
        }
	if (`grep EXPORT_SYMBOL "$package_root/$package_file"`) {
	  print OUTPUT << 'EOF';
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
#define EXPORT_SYMBOL(noexport)
#endif

EOF
        }
        if (`grep 'copy_from_user\\|copy_to_user\\|get_user_data' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
/* copy_from/to_usr is called memcpy_from/to_fs in 2.0 kernels 
   get_user was redefined in 2.1 kernels to use two arguments, and returns
   an error code */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,4))
#define copy_from_user memcpy_fromfs
#define copy_to_user memcpy_tofs
#define get_user_data(to,from) ((to) = get_user(from),0)
#else
#include <asm/uaccess.h>
#define get_user_data(to,from) get_user(to,from)
#endif

EOF
        }
        if (`grep 'schedule_timeout' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
/* Add a scheduling fix for the new code in kernel 2.1.127 */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,127))
#define schedule_timeout(x) ( current->timeout = jiffies + (x), schedule() )
#endif

EOF
        }
        if (`grep 'pci_' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
/* If the new PCI interface is not present, fall back on the old PCI BIOS
   interface. We also define some things to unite both interfaces. Not
   very nice, but it works like a charm. 
   device is the 2.1 struct pci_dev, bus is the 2.0 bus number, dev is the
   2.0 device/function code, com is the PCI command, and res is the result. */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,54))
#define pci_present pcibios_present
#define pci_read_config_byte_united(device,bus,dev,com,res) \
                            pcibios_read_config_byte(bus,dev,com,res)
#define pci_read_config_word_united(device,bus,dev,com,res) \
                            pcibios_read_config_word(bus,dev,com,res)
#define pci_write_config_byte_united(device,bus,dev,com,res) \
                            pcibios_write_config_byte(bus,dev,com,res)
#define pci_write_config_word_united(device,bus,dev,com,res) \
                            pcibios_write_config_word(bus,dev,com,res)
#else
#define pci_read_config_byte_united(device,bus,dev,com,res) \
                            pci_read_config_byte(device,com,res)
#define pci_read_config_word_united(device,bus,dev,com,res) \
                            pci_read_config_word(device,com,res)
#define pci_write_config_byte_united(device,bus,dev,com,res) \
                            pci_write_config_byte(device,com,res)
#define pci_write_config_word_united(device,bus,dev,com,res) \
                            pci_write_config_word(device,com,res)
#endif

EOF
        }
        if (`grep 'ioremap\\|iounmap' "$package_root/$package_file"`) {
          print OUTPUT  << 'EOF';
/* I hope this is always correct, even for the PPC, but I really think so.
   And yes, the kernel version is exactly correct */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0))
#include <linux/mm.h>
#define ioremap vremap
#define iounmap vfree
#endif

EOF
        }
        if (`grep 'init_MUTEX' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,1))
#define init_MUTEX(s) do { *(s) = MUTEX; } while(0)
#endif
EOF
        }
	if (`grep '__init' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,53)
#include <linux/init.h>
#else
#define __init
#define __initdata
#endif
EOF
	}
        if (`grep 'PCI_DEVICE_ID_VIA_82C586_3' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,0,34))
#define PCI_DEVICE_ID_VIA_82C586_3  0x3040
#endif
EOF

        }
        if (`grep 'PCI_DEVICE_ID_AL_M7101' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,0,34))
#define PCI_DEVICE_ID_AL_M7101 0x7101
#endif
EOF
        }
        if (`grep 'PCI_DEVICE_ID_INTEL_82371AB_3' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,0,31))
#define PCI_DEVICE_ID_INTEL_82371AB_3  0x7113
#endif
EOF
        }
        if (`grep 'PCI_VENDOR_ID_APPLE' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,0,31))
#define PCI_VENDOR_ID_APPLE            0x106b
#endif
EOF
        }
        if (`grep 'PCI_DEVICE_ID_APPLE_HYDRA' "$package_root/$package_file"`) {
          print OUTPUT << 'EOF';
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,0,31))
#define PCI_DEVICE_ID_APPLE_HYDRA      0x000e
#endif
EOF
        }
	if (`grep 'PCI_DEVICE_ID_INTEL_82801AA_3\\|PCI_DEVICE_ID_INTEL_82801AB_3' "$package_root/$package_file"`) {
	  print OUTPUT << 'EOF';
#ifndef PCI_DEVICE_ID_INTEL_82801AA_3
#define PCI_DEVICE_ID_INTEL_82801AA_3  0x2413
#endif
#ifndef PCI_DEVICE_ID_INTEL_82801AB_3
#define PCI_DEVICE_ID_INTEL_82801AB_3  0x2423
#endif
EOF
        }
        print OUTPUT << 'EOF';

/* --> END OF COMPATIBILITY SECTION */

EOF
      } else {
        print OUTPUT;
      }
    }
    close INPUT;
    close OUTPUT;

    $kernel_file = $files{$package_file};
    print_diff $package_root,$kernel_root,$kernel_file,$temp;
  }

  gen_Makefile $package_root, $kernel_root;
  gen_drivers_Makefile $package_root, $kernel_root;
  gen_drivers_char_Config_in $package_root, $kernel_root;
  gen_drivers_char_mem_c $package_root, $kernel_root;
  gen_drivers_i2c_Config_in $package_root, $kernel_root;
  gen_drivers_i2c_Makefile $package_root, $kernel_root;
  gen_drivers_i2c_i2c_core_c $package_root, $kernel_root;
  gen_Documentation_Configure_help $package_root, $kernel_root;
  gen_MAINTAINERS $package_root, $kernel_root;
}

main;