configure.ac: add libusb/libusbx support (for xpp)

* Use pkg-config
* For tight control have: --with-libusbx, --with-libusb
  - For now, we choose libusb (AKA libusb-0.1)
  - After committing support for libusbx (AKA libusb-1.0)
    we'll change the default.

Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

configure.ac

@@ -182,6 +182,66 @@ AM_CONDITIONAL([PBX_PCAP], [test "$PBX_PCAP" = "1" -a "$DAHDI_TXMIRROR" = "1"])
 
 AC_CHECK_FUNCS([semtimedop])
 
+# What the user asked for? libusb/libusbx
+AC_ARG_WITH([libusbx],
+	[AS_HELP_STRING([--without-libusbx], [Disable libusbx @<:@default=check@:>@])],
+	[],
+	[with_libusbx=check])
+AC_ARG_WITH([libusb],
+	[AS_HELP_STRING([--without-libusb], [Disable libusb-0.1 @<:@default=check@:>@])],
+	[],
+	[with_libusb=check])
+
+# LIBUSBX tests
+have_libusbx=
+AS_IF([test "$with_libusbx" = "yes"],
+	[PKG_CHECK_MODULES([LIBUSBX], [libusb-1.0],
+		[AC_CHECK_LIB([usb-1.0], [libusb_error_name],
+			[
+				have_libusbx="yes"
+				AC_SUBST([PKG_CONFIG_LIBUSB], [libusb-1.0])
+				AC_DEFINE([HAVE_LIBUSBX], [1], [Define to 1 if you have <libusb.h>.])
+				AC_SUBST([PBX_USB], [1])
+			], [
+				if test "$with_libusbx" != "yes"; then
+					AC_MSG_NOTICE([Ignoring old libusb-1.0, trying fallback to old libusb])
+				fi
+			])
+		], [:])
+	], [])
+
+AS_IF([test "$with_libusbx" = "yes" -a "$have_libusbx" = ""],
+	[AC_MSG_ERROR([No libusbx found (--with-libusbx was given)])])
+
+# LIBUSB tests
+have_libusb=
+AS_IF([test "$with_libusb" != "no"],
+	[AS_IF([test "$have_libusbx" != ""],
+		[
+			AS_IF([test "$with_libusbx" = "check"], [
+				AC_MSG_NOTICE([Skipping LIBUSB tests (have good LIBUSBX)])
+				])
+		], [
+			PKG_CHECK_MODULES([LIBUSB], [libusb],
+				[
+					have_libusb="yes"
+					AC_SUBST([PKG_CONFIG_LIBUSB], [libusb])
+					AC_SUBST([PBX_USB], [1])
+				]
+				[AC_DEFINE([HAVE_LIBUSB], [1], [Define to 1 if you have <usb.h>.])],
+				[:]
+				)
+		])
+	], [])
+
+AS_IF([test "$with_libusb" = "yes" -a "$have_libusb" = ""],
+	[AC_MSG_ERROR([No libusb found (--with-libusb was given)])])
+
+AM_CONDITIONAL([LIBUSBX], [test "$have_libusbx" != ""])
+AM_CONDITIONAL([LIBUSB], [test "$have_libusb" != ""])
+AM_CONDITIONAL([PBX_USB], [test "$PBX_USB" = "1"])
+
+
 PBX_HDLC=0
 AC_MSG_CHECKING([for GENERIC_HDLC_VERSION version 4 in linux/hdlc.h])
 AC_COMPILE_IFELSE(
@@ -296,8 +356,6 @@ fi
 
 AC_SUBST(PPPD_VERSION)
 
-AM_CONDITIONAL([PBX_USB], [test "$PBX_USB" = "1"])
-
 # Taken from octasic-helper
 AC_SUBST([USE_OCTASIC], [yes])
 AM_CONDITIONAL([USE_OCTASIC], [test "$USE_OCTASIC" = 'yes'])

xpp/Makefile.am

@@ -66,6 +66,18 @@ if	PBX_USB
 
 SUBDIRS		+= oct612x
 
+if	LIBUSBX
+USB_CFLAGS		= $(LIBUSBX_CFLAGS)
+USB_LIBS		= $(LIBUSBX_LIBS)
+USB_NAME		= libusbx
+else
+if	LIBUSB
+USB_CFLAGS		= $(LIBUSB_CFLAGS)
+USB_LIBS		= $(LIBUSB_LIBS)
+USB_NAME		= libusb
+endif
+endif
+
 noinst_LTLIBRARIES	= libastribank.la libecholoader.la libhexfile.la
 
 libastribank_la_SOURCES	= \
@@ -115,7 +127,7 @@ test_parse_LDADD	= libhexfile.la
 
 astribank_tool_SOURCES		= astribank_tool.c
 astribank_tool_CFLAGS		= $(GLOBAL_CFLAGS)
-astribank_tool_LDFLAGS		= $(USB_LIB)
+astribank_tool_LDFLAGS		= $(USB_LIBS)
 astribank_tool_LDADD		= libastribank.la
 
 astribank_hexload_SOURCES	= \
@@ -125,7 +137,7 @@ astribank_hexload_SOURCES	= \
 			#
 
 astribank_hexload_CFLAGS	= $(GLOBAL_CFLAGS) $(OCTASIC_CFLAGS)
-astribank_hexload_LDFLAGS	= $(USB_LIB)
+astribank_hexload_LDFLAGS	= $(USB_LIBS)
 astribank_hexload_LDADD		= \
 		libhexfile.la	\
 		libastribank.la	\
@@ -140,7 +152,7 @@ astribank_allow_SOURCES		= \
 			#
 
 astribank_allow_CFLAGS		= $(GLOBAL_CFLAGS)
-astribank_allow_LDFLAGS		= $(USB_LIB)
+astribank_allow_LDFLAGS		= $(USB_LIBS)
 astribank_allow_LDADD		= libastribank.la
 
 man_pages	= \