# Makefile for the plustek scanner driver (kernel-module)
#
###############################################################################
#
# define the directories
#
HOME_DIR := .
SRC_DIR  := $(HOME_DIR)
INC_DIR  := $(SRC_DIR)
OBJ_DIR  := $(HOME_DIR)/obj
DOC_DIR  := $(HOME_DIR)/doc
BACKEND  := $(SRC_DIR)

#
# define the used tools
#
MD  = mkdir -p
CC  = gcc
TAR = tar
REF = cxref

#
# Comment/uncomment the following line to disable/enable debugging
# can also be set by commandline parameter: make all DEBUG=y
#
#DEBUG = y

#
# common compiler options
#
OPT = -fomit-frame-pointer -D_PTDRV_VERSTR=\"$(VERSIONSTR)\"

#
# cxref options
#
REFOPT = -xref-all -index-all -html32

#
# Comment out if you are not running SMP. Someone take this out of here
# when the SMP stuff gets moved out of the kernel Makefile.
# SMP = 1
# SMP_PROF = 1

#
# add the following to get assembly listing
# -Wa,-alh,-L -g 

#
# get some version numbers
#
ifeq ($(LINUXVERSION),)
 LINUXVERSION = $(shell uname -r)
endif

VERSIONSTR = $(shell grep "define BACKEND_VERSION" $(SRC_DIR)/plustek_pp.c | cut -b25-50 )

# Change it here or specify it on the "make" commandline
ifeq ($(HEADER_PATH),)
MACHTYPE = $(shell env | grep debian-linux | wc -l | sed 's/ //g')
ifeq ($(MACHTYPE),1)
#  debian
  HEADER_PATH = /usr/src/kernel-headers-$(LINUXVERSION)/include
else
#  redhat, slackware
  HEADER_PATH = /usr/src/linux/include
endif
#   HEADER_PATH = /usr/include
endif

ifeq ($(DEBUG),y)
  DEBFLAGS = -O -g -DDEBUG # "-O" is needed to expand inlines
else
  DEBFLAGS = -O2
endif

#
# the new style reference
#
K24_HEADER_PATH = /lib/modules/$(LINUXVERSION)/build/include

#
# try to autodetect if we can use the new style header include references
#
KERNEL_HEADERS = $(shell if test -d $(K24_HEADER_PATH); then \
							echo $(K24_HEADER_PATH); 		 \
				 	     else 								 \
							echo $(HEADER_PATH); 			 \
					     fi; )

#
# seems to be necessary for kernels 2.4.x
#
MODVERFILE = $(shell if [ -e $(KERNEL_HEADERS)/linux/modversions.h ]; then \
						echo $(KERNEL_HEADERS)/linux/modversions.h ;	   \
					 else											       \
						echo $(KERNEL_HEADERS)/linux/modsetver.h ;		   \
					 fi )

MODFLAGS = -DMODULE

#
# set MODVERSIONS if the kernel uses it
#
VERSUSED = $(shell grep 'define CONFIG_MODVERSIONS' \
                   $(KERNEL_HEADERS)/linux/autoconf.h | wc -l | sed 's/ //g')
ifeq ($(VERSUSED),1)
  MODFLAGS += -DMODVERSIONS -include $(MODVERFILE)
endif


WARNFLAGS = -Wall -Wstrict-prototypes
CFLAGS    = $(WARNFLAGS) $(OPT) -D__KERNEL__ -I$(KERNEL_HEADERS) -I$(INC_DIR) -I$(BACKEND) $(DEBFLAGS) $(MODFLAGS)
MODLIB    = /lib/modules/$(LINUXVERSION)

ifdef SMP
CFLAGS += -D__SMP__

ifdef SMP_PROF
CFLAGS += -D__SMP_PROF__
endif
endif

TARGET = pt_drv

OBJ  = $(TARGET).o
NAMES := dac detect genericio image map misc models io procfs
NAMES := $(NAMES) motor p9636 ptdrv scale tpa p48xx p12 p12ccd
NAMES := $(addprefix plustek-pp_, $(NAMES))
SRCS  := $(addprefix $(SRC_DIR)/, $(NAMES))
SRCS  := $(addsuffix .c, $(SRCS))
OBJS  := $(addprefix $(OBJ_DIR)/, $(NAMES))
OBJS  := $(addsuffix .o, $(OBJS))
INCS  := scan dbg types scandata procs hwdefs sysdep
INCS  := $(addsuffix .h, $(INCS))
HDRS  = $(addprefix $(INC_DIR)/plustek-pp_, $(INCS))

#
# the header files we need from the backend
#
BACKINCS := plustek-pp.h
BACKINCS := $(addprefix $(BACKEND)/, $(BACKINCS))

group = "root"
mode  = "644"
INST_DIR = /lib/modules/$(LINUXVERSION)/kernel/drivers/char

info:
	@clear
	@echo "Makefile to create the Plustek-Scanner kernel-module:"
	@echo "all          ... builds the module"
	@echo "all DEBUG=y  ... builds the module with debug-messages enabled"
	@echo "clean        ... cleans up the show"
	@echo "install      ... installs the module to the library path"
	@echo "uninstall    ... removes the module from the library path"
	@echo "load         ... tries to load the module and creates device nodes"
	@echo "unload       ... unloads the module"


all: .depend chkdir $(OBJ)

#
# create object directory
#
.PHONY : chkdir
chkdir:
	@-$(MD) $(OBJ_DIR)
	@-$(MD) $(DOC_DIR)

$(OBJ): $(OBJS)
	$(LD) -r $^ -o $@

$(OBJS): Makefile $(HDRS) $(BACKINCS)

$(OBJ_DIR)/%.o : $(SRC_DIR)/%.c
	$(CC) $(CFLAGS) -c $< -o $@

$(OBJ_DIR)/$(OBJ): VERSION1 VERSION0

#
# copy the driver to the modules directory
#
install:
	mkdir -p $(INST_DIR)
	install -c -m $(mode) $(OBJ) $(INST_DIR)
	/sbin/depmod -a

#
# remove it
#
uninstall:
	rm -f $(INST_DIR)/$(OBJ)

#
# use modprobe to load the driver, remember to set the
# parameter in /etc/modules.conf (see sane-plustek_pp.man for more details)
#
load:   $(INST_DIR)/$(OBJ)
# invoke modprobe with all arguments we got
	/sbin/modprobe $(TARGET) || exit 1

# Remove stale nodes and replace them, then give gid and perms
	rm -f /dev/$(TARGET)*

# when using the devfs support, we check the /dev/scanner entries
# and only create links to the devfs nodes
# at least we create one link
	@if [ -e /dev/scanner/$(TARGET)* ]; then 				\
		ln -s /dev/scanner/$(TARGET)0 /dev/$(TARGET);		\
		for name in `ls /dev/scanner | grep $(TARGET)`; do	\
			ln -s /dev/scanner/$$name /dev/$$name ;     	\
		done												\
	else                      								\
		mknod /dev/$(TARGET) c `cat /proc/devices | sed -ne "s/\([0-9]*\) pt_drv/\1/p"` 0;  \
		mknod /dev/$(TARGET)0 c `cat /proc/devices | sed -ne "s/\([0-9]*\) pt_drv/\1/p"` 0;	\
		mknod /dev/$(TARGET)1 c `cat /proc/devices | sed -ne "s/\([0-9]*\) pt_drv/\1/p"` 1;	\
		mknod /dev/$(TARGET)2 c `cat /proc/devices | sed -ne "s/\([0-9]*\) pt_drv/\1/p"` 2; \
		mknod /dev/$(TARGET)3 c `cat /proc/devices | sed -ne "s/\([0-9]*\) pt_drv/\1/p"` 3;	\
																							\
		chgrp $(group) /dev/$(TARGET)*;	\
		chmod $(mode)  /dev/$(TARGET)*;	\
	fi

#
# unload the driver
#
unload:
	/sbin/modprobe -r $(TARGET) || exit 1

# Remove stale nodes
	rm -f /dev/$(TARGET)*

#
# create reference docu
#
doc: chkdir
	$(REF) $(REFOPT) $(INC_DIR)/*.h $(SRC_DIR)/*.c $(BACKEND)/plustek-share.h \
    -D__KERNEL__ -I$(KERNEL_HEADERS) -I$(INC_DIR) -I$(BACKEND) $(MODFLAGS) \
    -D_PTDRV_V1=$(VERSION1) -D_PTDRV_V0=$(VERSION0) -D_PTDRV_BUILD=$(BUILD) -O$(DOC_DIR)

clean:
	@-rm -f $(OBJ_DIR)/*.o .depend depend dep $(REF).* *.html $(TARGET).o
	@-rm -rf $(OBJ_DIR)
	@-rm -rf $(DOC_DIR)

depend .depend dep:
	$(CC) $(CFLAGS) -M $(SRCS) > $@

ifeq (.depend,$(wildcard .depend))
#include .depend
endif