#
# Based on:
# Makefile for DAHDI Linux kernel modules
#
# Copyright (C) 2001-2009 Digium, Inc.
# 
# License: <fill in stanza. Basically: GPLv2>
#

#
# This package allow:
# A. test-building modules vs. DAHDI
# B. generating a single patch of all the modules vs. the DAHDI tree.
#
# The default target here is to build all the modules. This requires various
# DAHDI headers installed under /usr/include/dahdi . Some drivers will also
# need some adjustment to include those files from there rather than from
# the working directory.
#
#   make               # just build
#   make test-install  # install under testroot/
#
# The modules built here are likely not to be useful as-is due to the
# missing symbols from DAHDI. However they should expose most (if not
# all) build warnings and errors.
#
# Some extra useful switches:
#
#    KVERS=<version>   # build with kernel version <version>
#    KSRC=</full/path> # build with kernel tree from /full/path
#    C=1/C=2           # Check with sparse (1: just when building, 2: all)
#
# The patch is generated by running:
#
#   make gen-patch
#
# This generates a patch vs. dahdi in the file: dahdi_linux_extra.diff
#
# Other targets:
#
#   make clean
#   make stackcheck   # FIXME: doesn't work?
#

PWD:=$(shell pwd)

DAHDI_LINUX_BRANCH =trunk
DAHDI_LINUX_URL	= http://svn.asterisk.org/svn/dahdi/linux/$(DAHDI_LINUX_BRANCH)
SVN_DIR_SRC	= dahdi-svn-orig
SVN_DIR_DST	= dahdi-svn-new

BASE_DIR	= drivers/dahdi
MODULE_DIRS	= drivers/staging/echo

DAHDI_LINUX_DIFF = dahdi_linux_extra.diff

# Files we shouldn't copy:
OVERRIDE_FILES	= Kbuild dahdi_echocan_oslec.c

# If you want to build for a kernel other than the current kernel, set KVERS
ifndef KVERS
KVERS:=$(shell uname -r)
endif
ifndef KSRC
  ifneq (,$(wildcard /lib/modules/$(KVERS)/build))
    KSRC:=/lib/modules/$(KVERS)/build
  else
    KSRC_SEARCH_PATH:=/usr/src/linux
    KSRC:=$(shell for dir in $(KSRC_SEARCH_PATH); do if [ -d $$dir ]; then echo $$dir; break; fi; done)
  endif
endif
KVERS_MAJ:=$(shell echo $(KVERS) | cut -d. -f1-2)
KINCLUDES:=$(KSRC)/include

# We use the kernel's .config file as an indication that the KSRC
# directory is indeed a valid and configured kernel source (or partial
# source) directory.
#
# We also source it, as it has the format of Makefile variables list.
# Thus we will have many CONFIG_* variables from there.
KCONFIG:=$(KSRC)/.config
ifneq (,$(wildcard $(KCONFIG)))
  HAS_KSRC:=yes
  include $(KCONFIG)
else
  HAS_KSRC:=no
endif

CHECKSTACK=$(KSRC)/scripts/checkstack.pl

# Set HOTPLUG_FIRMWARE=no to override automatic building with hotplug support
# if it is enabled in the kernel.

ifeq (yes,$(HAS_KSRC))
  HOTPLUG_FIRMWARE:=$(shell if grep -q '^CONFIG_FW_LOADER=[ym]' $(KCONFIG); then echo "yes"; else echo "no"; fi)
endif

MODULE_ALIASES:=wcfxs wctdm8xxp wct2xxp

INST_HEADERS:=kernel.h user.h fasthdlc.h wctdm_user.h dahdi_config.h

DAHDI_BUILD_ALL:=m

KMAKE=$(MAKE) -C $(KSRC) SUBDIRS=$(PWD)/drivers/dahdi 

ifneq (,$(wildcard $(DESTDIR)/etc/udev/rules.d))
  DYNFS:=yes
endif

ROOT_PREFIX:=

ASCIIDOC:=asciidoc
ASCIIDOC_CMD:=$(ASCIIDOC) -n -a toc -a toclevels=4

GENERATED_DOCS:=README.html dahdi-api.html

ifneq ($(wildcard .version),)
  DAHDIVERSION:=$(shell cat .version)
else
ifneq ($(wildcard .svn),)
  DAHDIVERSION:=$(shell build_tools/make_version . dahdi/linux)
endif
endif

TESTROOT:=testroot

all: modules

modules: 
ifeq (no,$(HAS_KSRC))
	@echo "You do not appear to have the sources for the $(KVERS) kernel installed."
	@exit 1
endif
	$(KMAKE) modules DAHDI_BUILD_ALL=$(DAHDI_BUILD_ALL)

stackcheck: $(CHECKSTACK) modules
	objdump -d drivers/dahdi/*.ko drivers/dahdi/*/*.ko | $(CHECKSTACK)

install: modules
	$(KMAKE) INSTALL_MOD_PATH=$(DESTDIR) INSTALL_MOD_DIR=dahdi modules_install
	[ `id -u` = 0 ] && /sbin/depmod -a $(KVERS) || :


clean:
ifneq (no,$(HAS_KSRC))
	$(KMAKE) clean
endif
	rm -rf $(SVN_DIR_SRC) $(SVN_DIR_DST) $(DAHDI_LINUX_DIFF) $(TESTROOT)


test-install:
	$(MAKE) install DESTDIR=$(PWD)/$(TESTROOT)

gen-patch:
	rm -rf $(SVN_DIR_SRC) $(SVN_DIR_DST)
	svn export -q $(DAHDI_LINUX_URL) $(SVN_DIR_SRC)
	cp -a $(SVN_DIR_SRC) $(SVN_DIR_DST)
	for dir in $(MODULE_DIRS); do \
	  mkdir -p $(SVN_DIR_DST)/$$dir; \
	  cp $$dir/*.[ch] $$dir/Kbuild $(SVN_DIR_DST)/$$dir/ ; \
	done
	# Preserve base Kbuild:
	for file in $(OVERRIDE_FILES); do \
	  cp $(SVN_DIR_SRC)/$(BASE_DIR)/$$file $(SVN_DIR_DST)/$(BASE_DIR)/; \
	done
	find $(SVN_DIR_DST)/$(BASE_DIR) -name \*.mod.c | xargs rm -rf dummyfile

	cat drivers/dahdi/Kconfig >>$(SVN_DIR_DST)/drivers/dahdi/Kconfig
	cat drivers/dahdi/Kconfig >>$(SVN_DIR_DST)/drivers/dahdi/Kconfig
	sed -e '/^####### END OF DATA ########/,$$d' drivers/dahdi/Kbuild \
	| sed -i -e R/dev/stdin $(SVN_DIR_DST)/drivers/dahdi/Kbuild
	diff -urN $(SVN_DIR_SRC) $(SVN_DIR_DST) >$(DAHDI_LINUX_DIFF) \
	|| [ $$? -eq 1 ]



.PHONY: clean all install modules stackcheck test-install gen-patch