Merge pull request #196 from WiringPi/revision

Revision 3.1

VERSION

@@ -1 +1 @@
-3.0
+3.1

build

@@ -3,7 +3,7 @@
 # build
 #	Simple wiringPi build and install script
 #
-#	Copyright (c) 2012-2015 Gordon Henderson
+#	Copyright (c) 2012-2024 Gordon Henderson and contributors
 #################################################################################
 # This file is part of wiringPi:
 #	A "wiring" library for the Raspberry Pi
@@ -83,11 +83,14 @@ fi
 # Only if you know what you're doing!
 
 if [ x$1 = "xdebian" ]; then
+  vMaj=`cut -d. -f1 VERSION`
+  vMin=`cut -d. -f2 VERSION`
   here=`pwd`
   deb_destdir=${here}/debian-template/wiringPi
   cd debian-template/wiringPi
+  export VERSION=$vMaj.$vMin
   export ARCH=$(dpkg-architecture -qDEB_HOST_ARCH)
-  echo architecture $ARCH
+  echo version:$VERSION architecture:$ARCH
   envsubst < control_template > DEBIAN/control
   rm -rf usr
   cd $here/wiringPi

debian-template/wiringPi/control_template

@@ -1,5 +1,5 @@
 Package: wiringpi
-Version: 3.0
+Version: $VERSION
 Section: libraries
 Priority: optional
 Architecture: $ARCH
@@ -11,3 +11,4 @@ Description: The wiringPi libraries, headers and gpio command
   programs as well as from the command-line
 Homepage: https://github.com/WiringPi/WiringPi
 Bugs: https://github.com/WiringPi/WiringPi/issues
+

gpio/gpio.c

@@ -368,7 +368,7 @@ static void doUnLoad (int argc, char *argv [])
 
 static void doI2Cdetect (UNU int argc, char *argv [])
 {
-  int port = piGpioLayout () == 1 ? 0 : 1 ;
+  int port = piGpioLayout () == GPIO_LAYOUT_PI1_REV1 ? 0 : 1 ;
   char *c, *command ;
 
   if ((c = findExecutable (I2CDETECT)) == NULL)

newVersion

@@ -32,19 +32,3 @@ echo "#define VERSION \"`cat VERSION`\"" > version.h
 echo "#define VERSION_MAJOR $vMaj"		>> version.h
 echo "#define VERSION_MINOR $vMin"		>> version.h
 
-rm -f debian-template/wiringPi/DEBIAN/control
-cat > debian-template/wiringPi/DEBIAN/control <<EOF
-Package: wiringpi
-Version: `cat VERSION`
-Section: libraries
-Priority: optional
-Architecture: armhf
-Depends: libc6
-Maintainer: Grazer Computer Club - GC2 <wiringpi@gc2.at>
-Uploaders: Grazer Computer Club - GC2 <wiringpi@gc2.at>
-Description: The wiringPi libraries, headers and gpio command
-  Libraries to allow GPIO access on a Raspberry Pi from C and C++
-  and BASIC programs as well as from the command-line
-Homepage: https://github.com/WiringPi/WiringPi/
-Bugs: https://github.com/WiringPi/WiringPi/
-EOF

reinstall

@@ -0,0 +1,11 @@
+#!/bin/sh
+vMaj=`cut -d. -f1 VERSION`
+vMin=`cut -d. -f2 VERSION`
+DEBVERSION=$vMaj.$vMin
+sudo apt -y remove wiringpi
+./build clean
+./build debian
+mv debian-template/wiringpi_${DEBVERSION}_armhf.deb .
+sudo apt install ./wiringpi_${DEBVERSION}_armhf.deb
+
+

version.h

@@ -1,3 +1,3 @@
-#define VERSION "3.0"
+#define VERSION "3.1"
 #define VERSION_MAJOR 3
-#define VERSION_MINOR 0
+#define VERSION_MINOR 1

wiringPi/Makefile

@@ -61,7 +61,8 @@ SRC	=	wiringPi.c						\
 		bmp180.c htu21d.c ds18b20.c rht03.c			\
 		drcSerial.c drcNet.c					\
 		pseudoPins.c						\
-		wpiExtensions.c
+		wpiExtensions.c						\
+		wiringPiLegacy.c
 
 HEADERS =	$(shell ls *.h)
 

wiringPi/wiringPi.c

@@ -70,12 +70,14 @@
 #include <sys/wait.h>
 #include <sys/ioctl.h>
 #include <asm/ioctl.h>
+#include <byteswap.h>
 
 #include "softPwm.h"
 #include "softTone.h"
 
 #include "wiringPi.h"
 #include "../version.h"
+#include "wiringPiLegacy.h"
 
 // Environment Variables
 
@@ -379,7 +381,8 @@ static int wiringPiMode = WPI_MODE_UNINITIALISED ;
 static volatile int    pinPass = -1 ;
 static pthread_mutex_t pinMutex ;
 
-static int RaspberryPiModel = -1;
+static int RaspberryPiModel  = -1;
+static int RaspberryPiLayout = -1;
 
 // Debugging & Return codes
 
@@ -874,141 +877,21 @@ static void usingGpioMemCheck (const char *what)
  *********************************************************************************
  */
 
-static void piGpioLayoutOops (const char *why)
+void piGpioLayoutOops (const char *why)
 {
   fprintf (stderr, "Oops: Unable to determine board revision from /proc/cpuinfo\n") ;
   fprintf (stderr, " -> %s\n", why) ;
-  fprintf (stderr, " ->  You'd best google the error to find out why.\n") ;
-//fprintf (stderr, " ->  http://www.raspberrypi.org/phpBB3/viewtopic.php?p=184410#p184410\n") ;
+  fprintf (stderr, " ->  Check at https://github.com/wiringpi/wiringpi/issues.\n") ;
   exit (EXIT_FAILURE) ;
 }
 
 int piGpioLayout (void)
 {
-  FILE *cpuFd ;
-  char line [120] ;
-  char *c ;
-  static int  gpioLayout = -1 ;
-
-  if (gpioLayout != -1)	// No point checking twice
-    return gpioLayout ;
-
-  if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL)
-    piGpioLayoutOops ("Unable to open /proc/cpuinfo") ;
-	
-#ifdef	DONT_CARE_ANYMORE
-// Start by looking for the Architecture to make sure we're really running
-//	on a Pi. I'm getting fed-up with people whinging at me because
-//	they can't get it to work on weirdFruitPi boards...
-  while (fgets (line, 120, cpuFd) != NULL)
-    if (strncmp (line, "Hardware", 8) == 0)
-      break ;
-
-  if (strncmp (line, "Hardware", 8) != 0)
-    piGpioLayoutOops ("No \"Hardware\" line") ;
-
-  if (wiringPiDebug)
-    printf ("piGpioLayout: Hardware: %s\n", line) ;
-
-// See if it's BCM2708 or BCM2709 or the new BCM2835.
-
-// OK. As of Kernel 4.8,  we have BCM2835 only, regardless of model.
-//	However I still want to check because it will trap the cheapskates and rip-
-//	off merchants who want to use wiringPi on non-Raspberry Pi platforms - which
-//	I do not support so don't email me your bleating whinges about anything
-//	other than a genuine Raspberry Pi.
-
-  if (! (strstr (line, "BCM2708") || strstr (line, "BCM2709") || strstr (line, "BCM2835")))
-  {
-    fprintf (stderr, "Unable to determine hardware version. I see: %s,\n", line) ;
-    fprintf (stderr, " - expecting BCM2708, BCM2709 or BCM2835.\n") ;
-    fprintf (stderr, "If this is a genuine Raspberry Pi then please report this\n") ;
-    fprintf (stderr, "at GitHub.com/wiringPi/wiringPi. If this is not a Raspberry Pi then you\n") ;
-    fprintf (stderr, "are on your own as wiringPi is designed to support the\n") ;
-    fprintf (stderr, "Raspberry Pi ONLY.\n") ;
-    exit (EXIT_FAILURE) ;
+  if (-1==RaspberryPiLayout) {
+    int   model, rev, mem, maker, overVolted ;
+    piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
   }
-
-// Actually... That has caused me more than 10,000 emails so-far. Mosty by
-//	people who think they know better by creating a statically linked
-//	version that will not run with a new 4.9 kernel. I utterly hate and
-//	despise those people.
-//
-//	I also get bleats from people running other than Raspbian with another
-//	distros compiled kernel rather than a foundation compiled kernel, so
-//	this might actually help them. It might not - I only have the capacity
-//	to support Raspbian.
-//
-//	However, I've decided to leave this check out and rely purely on the
-//	Revision: line for now. It will not work on a non-pi hardware or weird
-//	kernels that don't give you a suitable revision line.
-
-// So - we're Probably on a Raspberry Pi. Check the revision field for the real
-//	hardware type
-//	In-future, I ought to use the device tree as there are now Pi entries in
-//	/proc/device-tree/ ...
-//	but I'll leave that for the next revision. Or the next.
-#endif
-	
-// Isolate the Revision line
-
-  rewind (cpuFd) ;
-  while (fgets (line, 120, cpuFd) != NULL)
-    if (strncmp (line, "Revision", 8) == 0)
-      break ;
-
-  fclose (cpuFd) ;
-
-  if (strncmp (line, "Revision", 8) != 0)
-    piGpioLayoutOops ("No \"Revision\" line") ;
-
-// Chomp trailing CR/NL
-
-  for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
-    *c = 0 ;
-
-  if (wiringPiDebug)
-    printf ("piGpioLayout: Revision string: %s\n", line) ;
-
-// Scan to the first character of the revision number
-
-  for (c = line ; *c ; ++c)
-    if (*c == ':')
-      break ;
-
-  if (*c != ':')
-    piGpioLayoutOops ("Bogus \"Revision\" line (no colon)") ;
-
-// Chomp spaces
-
-  ++c ;
-  while (isspace (*c))
-    ++c ;
-
-  if (!isxdigit (*c))
-    piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)") ;
-
-// Make sure its long enough
-
-  if (strlen (c) < 4)
-    piGpioLayoutOops ("Bogus revision line (too small)") ;
-
-// Isolate  last 4 characters: (in-case of overvolting or new encoding scheme)
-
-  c = c + strlen (c) - 4 ;
-
-  if (wiringPiDebug)
-    printf ("piGpioLayout: last4Chars are: \"%s\"\n", c) ;
-
-  if ( (strcmp (c, "0002") == 0) || (strcmp (c, "0003") == 0))
-    gpioLayout = 1 ;
-  else
-    gpioLayout = 2 ;	// Covers everything else from the B revision 2 to the B+, the Pi v2, v3, zero and CM's.
-
-  if (wiringPiDebug)
-    printf ("piGpioLayoutOops: Returning revision: %d\n", gpioLayout) ;
-
-  return gpioLayout ;
+  return RaspberryPiLayout;
 }
 
 /*
@@ -1023,6 +906,36 @@ int piBoardRev (void)
 }
 
 
+const char* revfile = "/proc/device-tree/system/linux,revision";
+
+
+const char* GetPiRevision(char* line, int linelength, unsigned int* revision) {
+
+  const char* c = NULL;
+  uint32_t Revision = 0;
+  _Static_assert(sizeof(Revision)==4, "should be unsigend integer with 4 byte size");
+
+	FILE* fp = fopen(revfile,"rb");
+	if (!fp) {
+    if (wiringPiDebug)
+		  perror(revfile);
+		return NULL; // revision file not found or no access
+	}
+	int result = fread(&Revision, sizeof(Revision), 1, fp);
+	fclose(fp);
+	if (result<1) {
+    if (wiringPiDebug)
+		  perror(revfile);
+		return NULL; // read error
+	}
+	Revision = bswap_32(Revision);
+	snprintf(line, linelength, "Revision\t: %04x", Revision);
+  c =  &line[11];
+  *revision = Revision;
+  if (wiringPiDebug)
+	  printf("GetPiRevision: Revision string: \"%s\" (%s) - 0x%x\n", line, c, *revision);
+	return c;
+}
 
 /*
  * piBoardId:
@@ -1093,62 +1006,21 @@ int piBoardRev (void)
 
 void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
 {
-  FILE *cpuFd ;
-  char line [120] ;
-  char *c ;
-  unsigned int revision ;
+  const int maxlength = 120;
+  char line [maxlength+1] ;
+  const char *c ;
+  unsigned int revision = 0x00 ;
   int bRev, bType, bProc, bMfg, bMem, bWarranty ;
 
-//	Will deal with the properly later on - for now, lets just get it going...
-//  unsigned int modelNum ;
-
-  (void)piGpioLayout () ;	// Call this first to make sure all's OK. Don't care about the result.
-
-  if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL)
-    piGpioLayoutOops ("Unable to open /proc/cpuinfo") ;
-
-  while (fgets (line, 120, cpuFd) != NULL)
-    if (strncmp (line, "Revision", 8) == 0)
-      break ;
-
-  fclose (cpuFd) ;
-
-  if (strncmp (line, "Revision", 8) != 0)
-    piGpioLayoutOops ("No \"Revision\" line") ;
-
-// Chomp trailing CR/NL
-
-  for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
-    *c = 0 ;
-
-  if (wiringPiDebug)
-    printf ("piBoardId: Revision string: %s\n", line) ;
-
-// Need to work out if it's using the new or old encoding scheme:
-
-// Scan to the first character of the revision number
-
-  for (c = line ; *c ; ++c)
-    if (*c == ':')
-      break ;
-
-  if (*c != ':')
-    piGpioLayoutOops ("Bogus \"Revision\" line (no colon)") ;
-
-// Chomp spaces
-
-  ++c ;
-  while (isspace (*c))
-    ++c ;
-
-  if (!isxdigit (*c))
-    piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)") ;
-
-  revision = (unsigned int)strtol (c, NULL, 16) ; // Hex number with no leading 0x
-
-// Check for new way:
+  c = GetPiRevision(line, maxlength,  &revision); // device tree
+  if (NULL==c) {
+    c = GetPiRevisionLegacy(line, maxlength, &revision); // proc/cpuinfo
+  }
+  if (NULL==c) {
+    piGpioLayoutOops ("GetPiRevision failed!") ;
+  }
 
-  if ((revision &  (1 << 23)) != 0)	// New way
+  if ((revision &  (1 << 23)) != 0)	// New style, not available for Raspberry Pi 1B/A, CM
   {
     if (wiringPiDebug)
       printf ("piBoardId: New Way: revision is: %08X\n", revision) ;
@@ -1166,6 +1038,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
     *mem      = bMem ;
     *maker    = bMfg  ;
     *warranty = bWarranty ;
+    RaspberryPiLayout = GPIO_LAYOUT_DEFAULT ; //default
 
     if (wiringPiDebug)
       printf ("piBoardId: rev: %d, type: %d, proc: %d, mfg: %d, mem: %d, warranty: %d\n",
@@ -1193,9 +1066,9 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
     c = c + strlen (c) - 4 ;
 
 // Fill out the replys as appropriate
-
-    /**/ if (strcmp (c, "0002") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1   ; *mem = 0 ; *maker = PI_MAKER_EGOMAN  ; }
-    else if (strcmp (c, "0003") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1_1 ; *mem = 0 ; *maker = PI_MAKER_EGOMAN  ; }
+    RaspberryPiLayout = GPIO_LAYOUT_DEFAULT ; //default
+    /**/ if (strcmp (c, "0002") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1   ; *mem = 0 ; *maker = PI_MAKER_EGOMAN  ; RaspberryPiLayout = GPIO_LAYOUT_PI1_REV1; }
+    else if (strcmp (c, "0003") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1_1 ; *mem = 0 ; *maker = PI_MAKER_EGOMAN  ; RaspberryPiLayout = GPIO_LAYOUT_PI1_REV1; }
 
     else if (strcmp (c, "0004") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1_2 ; *mem = 0 ; *maker = PI_MAKER_SONY    ; }
     else if (strcmp (c, "0005") == 0) { *model = PI_MODEL_B  ; *rev = PI_VERSION_1_2 ; *mem = 0 ; *maker = PI_MAKER_EGOMAN  ; }
@@ -2600,7 +2473,7 @@ int wiringPiSetup (void)
 //	but it will give us information like the GPIO layout scheme (2 variants
 //	on the older 26-pin Pi's) and the GPIO peripheral base address.
 //	and if we're running on a compute module, then wiringPi pin numbers
-//	don't really many anything, so force native BCM mode anyway.
+//	don't really mean anything, so force native BCM mode anyway.
 
   piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
 
@@ -2611,7 +2484,7 @@ int wiringPiSetup (void)
   else
     wiringPiMode = WPI_MODE_PINS ;
 
-  /**/ if (piGpioLayout () == 1)	// A, B, Rev 1, 1.1
+  /**/ if (piGpioLayout () == GPIO_LAYOUT_PI1_REV1)	// A, B, Rev 1, 1.1
   {
      pinToGpio =  pinToGpioR1 ;
     physToGpio = physToGpioR1 ;
@@ -2867,7 +2740,7 @@ int wiringPiSetupSys (void)
   int   model, rev, mem, maker, overVolted ;
   piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
 
-  if (piGpioLayout () == 1)
+  if (piGpioLayout () == GPIO_LAYOUT_PI1_REV1)
   {
      pinToGpio =  pinToGpioR1 ;
     physToGpio = physToGpioR1 ;

wiringPi/wiringPi.h

@@ -120,6 +120,8 @@
 #define	PI_MAKER_EMBEST		2
 #define	PI_MAKER_UNKNOWN	3
 
+#define GPIO_LAYOUT_PI1_REV1 1   //Pi 1 A/B Revision 1, 1.1, CM
+#define GPIO_LAYOUT_DEFAULT  2
 
 extern const char *piModelNames    [24] ;
 extern const char *piProcessor     [ 5] ;
@@ -195,7 +197,7 @@ extern "C" {
 // Data
 
 // Internal
-
+extern void piGpioLayoutOops (const char *why);
 extern int wiringPiFailure (int fatal, const char *message, ...) ;
 
 // Core wiringPi functions
@@ -232,7 +234,7 @@ extern int  wiringPiSetupPiFaceForGpioProg (void) ;	// Don't use this - for gpio
 // On-Board Raspberry Pi hardware specific stuff
 
 extern          int  piGpioLayout        (void) ;
-extern          int  piBoardRev          (void) ;	// Deprecated
+extern          int  piBoardRev          (void) ;	// Deprecated, but does the same as piGpioLayout
 extern          void piBoardId           (int *model, int *rev, int *mem, int *maker, int *overVolted) ;
 extern          int  wpiPinToGpio        (int wpiPin) ;
 extern          int  physPinToGpio       (int physPin) ;

wiringPi/wiringPiLegacy.c

@@ -0,0 +1,188 @@
+
+#include <wiringPi.h>
+#include "wiringPiLegacy.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+extern int wiringPiDebug ;
+
+const char* GetPiRevisionLegacy(char* line, int linelength, unsigned int* revision) {
+  FILE *cpuFd ;
+  char *c = NULL;
+
+  if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL)
+    piGpioLayoutOops ("Unable to open /proc/cpuinfo") ;
+
+  while (fgets (line, linelength, cpuFd) != NULL) 
+    if (strncmp (line, "Revision", 8) == 0)
+      break ;
+
+  fclose (cpuFd) ;
+
+  if (strncmp (line, "Revision", 8) != 0)
+    piGpioLayoutOops ("No \"Revision\" line") ;
+
+// Chomp trailing CR/NL
+
+  for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
+    *c = 0 ;
+
+  if (wiringPiDebug)
+    printf ("GetPiRevisionLegacy: Revision string: %s\n", line) ;
+
+// Need to work out if it's using the new or old encoding scheme:
+
+// Scan to the first character of the revision number
+
+  for (c = line ; *c ; ++c)
+    if (*c == ':')
+      break ;
+
+  if (*c != ':')
+    piGpioLayoutOops ("Bogus \"Revision\" line (no colon)") ;
+
+// Chomp spaces
+
+  ++c ;
+  while (isspace (*c))
+    ++c ;
+
+  if (!isxdigit (*c))
+    piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)") ;
+
+  *revision = (unsigned int)strtol (c, NULL, 16) ; // Hex number with no leading 0x
+  return c;
+}
+
+
+
+// useless
+int piGpioLayoutLegacy (void)
+{
+  FILE *cpuFd ;
+  char line [120] ;
+  char *c ;
+  static int  gpioLayout = -1 ;
+
+  if (gpioLayout != -1)	// No point checking twice
+    return gpioLayout ;
+
+  if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL)
+    piGpioLayoutOops ("Unable to open /proc/cpuinfo") ;
+
+#ifdef	DONT_CARE_ANYMORE
+// Start by looking for the Architecture to make sure we're really running
+//	on a Pi. I'm getting fed-up with people whinging at me because
+//	they can't get it to work on weirdFruitPi boards...
+  while (fgets (line, 120, cpuFd) != NULL)
+    if (strncmp (line, "Hardware", 8) == 0)
+      break ;
+
+  if (strncmp (line, "Hardware", 8) != 0)
+    piGpioLayoutOops ("No \"Hardware\" line") ;
+
+  if (wiringPiDebug)
+    printf ("piGpioLayout: Hardware: %s\n", line) ;
+
+// See if it's BCM2708 or BCM2709 or the new BCM2835.
+
+// OK. As of Kernel 4.8,  we have BCM2835 only, regardless of model.
+//	However I still want to check because it will trap the cheapskates and rip-
+//	off merchants who want to use wiringPi on non-Raspberry Pi platforms - which
+//	I do not support so don't email me your bleating whinges about anything
+//	other than a genuine Raspberry Pi.
+
+  if (! (strstr (line, "BCM2708") || strstr (line, "BCM2709") || strstr (line, "BCM2835")))
+  {
+    fprintf (stderr, "Unable to determine hardware version. I see: %s,\n", line) ;
+    fprintf (stderr, " - expecting BCM2708, BCM2709 or BCM2835.\n") ;
+    fprintf (stderr, "If this is a genuine Raspberry Pi then please report this\n") ;
+    fprintf (stderr, "at GitHub.com/wiringPi/wiringPi. If this is not a Raspberry Pi then you\n") ;
+    fprintf (stderr, "are on your own as wiringPi is designed to support the\n") ;
+    fprintf (stderr, "Raspberry Pi ONLY.\n") ;
+    exit (EXIT_FAILURE) ;
+  }
+
+// Actually... That has caused me more than 10,000 emails so-far. Mosty by
+//	people who think they know better by creating a statically linked
+//	version that will not run with a new 4.9 kernel. I utterly hate and
+//	despise those people.
+//
+//	I also get bleats from people running other than Raspbian with another
+//	distros compiled kernel rather than a foundation compiled kernel, so
+//	this might actually help them. It might not - I only have the capacity
+//	to support Raspbian.
+//
+//	However, I've decided to leave this check out and rely purely on the
+//	Revision: line for now. It will not work on a non-pi hardware or weird
+//	kernels that don't give you a suitable revision line.
+
+// So - we're Probably on a Raspberry Pi. Check the revision field for the real
+//	hardware type
+//	In-future, I ought to use the device tree as there are now Pi entries in
+//	/proc/device-tree/ ...
+//	but I'll leave that for the next revision. Or the next.
+#endif
+
+// Isolate the Revision line
+
+  rewind (cpuFd) ;
+  while (fgets (line, 120, cpuFd) != NULL)
+    if (strncmp (line, "Revision", 8) == 0)
+      break ;
+
+  fclose (cpuFd) ;
+
+  if (strncmp (line, "Revision", 8) != 0)
+    piGpioLayoutOops ("No \"Revision\" line") ;
+
+// Chomp trailing CR/NL
+
+  for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
+    *c = 0 ;
+
+  if (wiringPiDebug)
+    printf ("piGpioLayout: Revision string: %s\n", line) ;
+
+// Scan to the first character of the revision number
+
+  for (c = line ; *c ; ++c)
+    if (*c == ':')
+      break ;
+
+  if (*c != ':')
+    piGpioLayoutOops ("Bogus \"Revision\" line (no colon)") ;
+
+// Chomp spaces
+
+  ++c ;
+  while (isspace (*c))
+    ++c ;
+
+  if (!isxdigit (*c))
+    piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)") ;
+
+// Make sure its long enough
+
+  if (strlen (c) < 4)
+    piGpioLayoutOops ("Bogus revision line (too small)") ;
+
+// Isolate  last 4 characters: (in-case of overvolting or new encoding scheme)
+
+  c = c + strlen (c) - 4 ;
+
+  if (wiringPiDebug)
+    printf ("piGpioLayout: last4Chars are: \"%s\"\n", c) ;
+
+  if ( (strcmp (c, "0002") == 0) || (strcmp (c, "0003") == 0))
+    gpioLayout = 1 ;
+  else
+    gpioLayout = 2 ;	// Covers everything else from the B revision 2 to the B+, the Pi v2, v3, zero and CM's.
+
+  if (wiringPiDebug)
+    printf ("piGpioLayout: Returning revision: %d\n", gpioLayout) ;
+
+  return gpioLayout ;
+}

wiringPi/wiringPiLegacy.h

@@ -0,0 +1,2 @@
+
+const char* GetPiRevisionLegacy(char* line, int linelength, unsigned int* revision);