#!/bin/bash

#set -x

#
# New files of CAN device interface and drivers
#
PATCH_DEVICE_NAME=socketcan-device.diff
PATCH_DEVICE_FILES="\
include/linux/can/dev.h \
drivers/net/can/dev.c"

PATCH_SYSFS_NAME=socketcan-sysfs.diff
PATCH_SYSFS_FILES="\
drivers/net/can/sysfs.c \
drivers/net/can/sysfs.h"

PATCH_DRIVER_SJA1000_NAME=socketcan-driver-sja1000.diff
PATCH_DRIVER_SJA1000_FILES="\
drivers/net/can/sja1000/sja1000.c \
drivers/net/can/sja1000/sja1000.h "

PATCH_DRIVER_SJA1000_EMS_PCI_NAME=socketcan-driver-sja1000-ems-pci.diff
PATCH_DRIVER_SJA1000_EMS_PCI_FILES="\
drivers/net/can/sja1000/ems_pci.c"

PATCH_DRIVER_SJA1000_IXXAT_PCI_NAME=socketcan-driver-sja1000-ixxat-pci.diff
PATCH_DRIVER_SJA1000_IXXAT_PCI_FILES="\
drivers/net/can/sja1000/ixxat_pci.c"

PATCH_DRIVER_SJA1000_KVASER_PCI_NAME=socketcan-driver-sja1000-kvaser-pci.diff
PATCH_DRIVER_SJA1000_KVASER_PCI_FILES="\
drivers/net/can/sja1000/kvaser_pci.c"

PATCH_DRIVER_SJA1000_PIPCAN_NAME=socketcan-driver-sja1000-pipcan.diff
PATCH_DRIVER_SJA1000_PIPCAN_FILES="\
drivers/net/can/sja1000/pipcan.c"

PATCH_DRIVER_SJA1000_PCM027_NAME=socketcan-driver-sja1000-pcm027.diff
PATCH_DRIVER_SJA1000_PCM027_FILES="\
drivers/net/can/sja1000/pcm027.c"

PATCH_DRIVER_SJA1000_PEAK_PCI_NAME=socketcan-driver-sja1000-peak-pci.diff
PATCH_DRIVER_SJA1000_PEAK_PCI_FILES="\
drivers/net/can/sja1000/peak_pci.c"

PATCH_DRIVER_MSCAN_NAME=socketcan-driver-mscan.diff
PATCH_DRIVER_MSCAN_FILES="\
drivers/net/can/mscan/mscan.c \
drivers/net/can/mscan/mscan.h \
drivers/net/can/mscan/mpc52xx_can.c"

#
# Old files of CAN core and VCAN driver
#
PATCH_CORE_NAME=socketcan-core.diff
PATCH_CORE_FILES="\
include/linux/can.h \
include/linux/can/raw.h \
include/linux/can/bcm.h \
include/linux/can/core.h \
include/linux/can/error.h \
net/can/af_can.c \
net/can/af_can.h \
net/can/proc.c \
net/can/raw.c \
net/can/bcm.c"

PATCH_DRIVER_VCAN_NAME=socketcan-driver-vcan.diff
PATCH_DRIVER_VCAN_FILES="\
drivers/net/can/vcan.c"

usage() {
    echo "usage: $0 <path-to-kernel-dir> <patch-to-output-dir>" >&2
    exit 1
}

#
# Main
#
HERE=$(pwd)
SRC_DIR=$HERE/kernel/2.6
SCR_DIR=$HERE/`dirname $0`
PATCH_DIR=$SCR_DIR/patches
HDR_DIR=$SCR_DIR/headers

[ ! -e $1/MAINTAINERS ] && usage
KERNEL_DIR=$1

if [ $# -gt 1 ]; then
    DEST_DIR=$2
else
    DEST_DIR=${HERE}/socketcan-patches
fi

echo $DEST_DIR
if [ -e $DEST_DIR ]; then
    echo "error: $DEST_DIR does already exist, exiting" >&2
    exit 1
fi

# determine kernel version
KERNEL_MAJOR=$(grep "^VERSION =" ${KERNEL_DIR}/Makefile | sed -e "s/[ \t]//g" | sed -e "s/VERSION=//g")
KERNEL_MINOR=$(grep "^PATCHLEVEL =" ${KERNEL_DIR}/Makefile | sed -e "s/[ \t]//g" | sed -e "s/PATCHLEVEL=//g")
KERNEL_MICRO=$(grep "^SUBLEVEL =" ${KERNEL_DIR}/Makefile | sed -e "s/[ \t]//g" | sed -e "s/SUBLEVEL=//g")
KERNEL_EXTRA=$(grep "^EXTRAVERSION =" ${KERNEL_DIR}/Makefile | sed -e "s/[ \t]//g" | sed -e "s/EXTRAVERSION=//g")

mkdir -p $DEST_DIR
export QUILT_PATCHES=$DEST_DIR

echo "Creating patches against kernel in $KERNEL_DIR"

num=0


for patch in \
    DEVICE \
    SYSFS \
    DRIVER_SJA1000 \
    DRIVER_SJA1000_EMS_PCI \
    DRIVER_SJA1000_IXXAT_PCI \
    DRIVER_SJA1000_KVASER_PCI \
    DRIVER_SJA1000_PIPCAN \
    DRIVER_SJA1000_PCM027 \
    DRIVER_SJA1000_PEAK_PCI \
    DRIVER_MSCAN \
    DRIVER_VCAN \
    CORE
  do
  name=PATCH_${patch}_NAME
  files=PATCH_${patch}_FILES
  append=PATCH_${patch}_APPEND

  num=$((num + 1))

  [ -z "${!name}" ] && continue

  patch_name=$(printf "%02i" $num)-${!name}
  echo "${patch_name}..."

  cd ${KERNEL_DIR}
  quilt new ${patch_name} > /dev/null

  for file in ${!files}; do
      quilt add ${file} > /dev/null
      mkdir -p $(dirname ${KERNEL_DIR}/${file})
      ${HERE}/strip-src \
	  -v ${KERNEL_MAJOR}.${KERNEL_MINOR}.${KERNEL_MICRO} \
	  -i \
	  ${SRC_DIR}/${file} > ${KERNEL_DIR}/${file}
  done

  file=$PATCH_DIR/$patch.diff
  if [ -r $file ]; then
      ok=n
      patch -p1 --dry-run < $file > /dev/null && ok=y
      if [ $ok = y ]; then
	  quilt add `grep "Index: " $file | cut -d"/" -f 2-` > /dev/null
	  patch -p1 < $file
      else
	  echo "Couldn't apply patch $file, please fix!"
      fi
  fi

  quilt refresh --diffstat > /dev/null

  file=$HDR_DIR/$patch.txt
  if [ -r $file ]; then
      quilt header --strip-trailing-whitespace -r < $file > /dev/null
  fi
done

quilt pop -a > /dev/null

#
# Check patches and add patch description
#
file=$DEST_DIR/checkpatch.log
echo "Checking patches, please inspect $file"
echo "Linux coding style issues reported by checkpatch.pl" > $file
for patch in $DEST_DIR/*.diff; do
    echo >> $file
    echo "***************************************************" >> $file
    echo "$patch" >> $file
    echo >> $file
    ${KERNEL_DIR}/scripts/checkpatch.pl ${patch} >> $file
done