package/libgpiod2: new package

Due to a significant api change as well as more recent kernel version
requirements, we introduce a separate package for version 2.0 and higher.
The new package is incompatible to libgpiod 1.x. This allows for iteratively
updating all dependent packages without breaking anything as a result.

For now we will have libgpiod2 depend on !libgpiod. However, in the
future, it might be preferable to have it the other way around,
such that packages, which select libgpiod2 don't have to also add the
the !libgpiod dependency.

Python bindings fail to build, so they are unconditionally disabled.
setup.py when called from Makefile tries to do native compilation
instead of cross-compilation, which fails at link time with
/usr/bin/ld: skipping incompatible ../../lib/.libs//libgpiod.so when searching for -lgpiod

Note that this package does not correspond to the debian libgpiod2 package,
which currently uses only version 1.6.3

Signed-off-by: Boerge Struempfel <bstruempfel@ultratronik.de>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

DEVELOPERS

@@ -531,6 +531,9 @@ N:	Bilal Wasim <bilalwasim676@gmail.com>
 F:	board/chromebook/elm/
 F:	configs/chromebook_elm_defconfig
 
+N:	Boerge Struempfel <boerge.struempfel@gmail.com>
+F:	package/libgpiod2/
+
 N:	Bogdan Radulescu <bogdan@nimblex.net>
 F:	package/iftop/
 F:	package/ncdu/

package/Config.in

@@ -1751,6 +1751,7 @@ menu "Hardware handling"
 	source "package/libftdi1/Config.in"
 	source "package/libgphoto2/Config.in"
 	source "package/libgpiod/Config.in"
+	source "package/libgpiod2/Config.in"
 	source "package/libgudev/Config.in"
 	source "package/libhid/Config.in"
 	source "package/libiio/Config.in"

package/libgpiod2/Config.in

@@ -0,0 +1,30 @@
+config BR2_PACKAGE_LIBGPIOD2
+	bool "libgpiod2"
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_10
+	depends on !BR2_PACKAGE_LIBGPIOD
+	help
+	  This is a C library that abstracts the GPIO character
+	  device operations on linux.
+
+	  This package is the continuation of the libgpiod package
+	  for versions 2.0 and above.
+
+	  Note that a kernel of 5.10 or above is required for the
+	  ioctls to work.
+
+	  https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/
+
+if BR2_PACKAGE_LIBGPIOD2
+
+config BR2_PACKAGE_LIBGPIOD2_TOOLS
+	bool "install tools"
+	help
+	  Include a set of command-line tools for managing GPIOs.
+
+endif
+
+comment "libgpiod2 needs kernel headers >= 5.10"
+	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_10
+
+comment "libgpiod2 is incompatible with libgpiod"
+	depends on BR2_PACKAGE_LIBGPIOD

package/libgpiod2/libgpiod2.hash

@@ -0,0 +1,4 @@
+# From https://www.kernel.org/pub/software/libs/libgpiod/sha256sums.asc
+sha256  fa4024a080121c958502f9a46a5bda44bea85e7a4dd7fcb3dead463b6fc4261c  libgpiod-2.1.tar.xz
+# Hash for license file
+sha256  eb17a56966db5d986bec449ee44ed61f01f9e3fafa952e527db67a8f9594fd11  COPYING

package/libgpiod2/libgpiod2.mk

@@ -0,0 +1,33 @@
+################################################################################
+#
+# libgpiod2
+#
+################################################################################
+
+# Be careful when bumping versions.
+# Dependency on kernel header versions may change.
+LIBGPIOD2_VERSION = 2.1
+LIBGPIOD2_SOURCE = libgpiod-$(LIBGPIOD2_VERSION).tar.xz
+LIBGPIOD2_SITE = https://www.kernel.org/pub/software/libs/libgpiod
+LIBGPIOD2_LICENSE = LGPL-2.1+
+LIBGPIOD2_LICENSE_FILES = COPYING
+LIBGPIOD2_INSTALL_STAGING = YES
+LIBGPIOD2_DEPENDENCIES = host-pkgconf host-autoconf-archive
+LIBGPIOD2_CONF_OPTS = \
+	--disable-bindings-python \
+	--disable-examples \
+	--disable-tests
+
+ifeq ($(BR2_PACKAGE_LIBGPIOD2_TOOLS),y)
+LIBGPIOD2_CONF_OPTS += --enable-tools
+else
+LIBGPIOD2_CONF_OPTS += --disable-tools
+endif
+
+ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
+LIBGPIOD2_CONF_OPTS += --enable-bindings-cxx
+else
+LIBGPIOD2_CONF_OPTS += --disable-bindings-cxx
+endif
+
+$(eval $(autotools-package))