Add retrieving version information from git

Author: lsgunth

.gitignore

@@ -13,3 +13,4 @@ __pycache__
 cscope.out
 tags
 *.o.d
+version.h

Makefile

@@ -17,6 +17,11 @@ install: modules_install
 
 .PHONY: install
 
+version.h: FORCE $(OBJDIR)
+	@$(SHELL_PATH) ./VERSION-GEN
+
+modules: | version.h
+
 %::
 	$(MAKE) -C $(KERNEL_SOURCES) M=$$PWD $@
 
@@ -33,5 +38,7 @@ pahole: pahole64 pahole32
 		echo "!!Arches don't match!!"
 
 clean::
-	rm -f pahole32 pahole64 pahole*.txt
+	rm -f pahole32 pahole64 pahole*.txt version.h
 	$(MAKE) -C $(KERNEL_SOURCES) M=$$PWD $@
+
+.PHONY: FORCE

VERSION-GEN

@@ -0,0 +1,83 @@
+#!/bin/bash
+########################################################################
+#
+# Copyright 2016 Keith Busch
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#
+# Forked off of nvme-cli:
+#   https://github.com/linux-nvme/nvme-cli/
+#
+########################################################################
+
+OBJDIR=${OBJDIR:-.}
+GVF=$OBJDIR/version.h
+DEF_VER=???
+
+LF='
+'
+
+# First see if there is a version file (included in release tarballs),
+# then try git-describe, then default.
+if test -f version; then
+	VN=$(cat version) || VN="$DEF_VER"
+elif test -d .git -o -f .git; then
+    VN=$(git describe --always --tags --match "v[0-9]*" HEAD 2>/dev/null)
+
+    git update-index -q --refresh
+    test -z "$(git diff-index --name-only HEAD --)" ||
+        VN="$VN-dirty"
+else
+	VN="$DEF_VER"
+fi
+
+VN=$(expr "$VN" : v*'\(.*\)')
+MVN=$(expr "$VN" : v*'\([0-9.]*\)')
+
+VN_RE='^([0-9]+)\.([0-9]+)(.([0-9]+))?(-rc[0-9]+)?(-([0-9]+)-g([A-Za-z0-9]+))?'
+if [[ $VN =~ $VN_RE ]]; then
+    MAJOR=${BASH_REMATCH[1]}
+    MINOR=${BASH_REMATCH[2]}
+    PATCH=${BASH_REMATCH[4]}
+    if [[ "$PATCH" -eq "" ]]; then
+        PATCH=0
+    fi
+    SINCE_TAG=${BASH_REMATCH[7]}
+    if [[ "$SINCE_TAG" -eq "" ]]; then
+        SINCE_TAG=0
+    fi
+else
+    MAJOR=0
+    MINOR=0
+    SINCE_TAG=0
+fi
+
+if test -r $GVF
+then
+	VC=$(head -n1 $GVF | sed -e 's/^#define VERSION //')
+	VC="${VC%\"}"
+	VC="${VC#\"}"
+else
+	VC=unset
+fi
+
+test "$VN" = "$VC" || {
+	echo "  VER   $VN"
+	echo "#define VERSION \"$VN\"" >$GVF
+}

ntb_hw_switchtec.c

@@ -20,8 +20,9 @@
 #include <linux/interrupt.h>
 #include <linux/ntb.h>
 
+#include "version.h"
 MODULE_DESCRIPTION("Microsemi Switchtec(tm) NTB Driver");
-MODULE_VERSION("0.1");
+MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Microsemi Corporation");
 

switchtec.c

@@ -23,8 +23,9 @@
 #include <linux/poll.h>
 #include <linux/wait.h>
 
+#include "version.h"
 MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver");
-MODULE_VERSION("0.1");
+MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Microsemi Corporation");