Add support for Raspberry Pi 4B

This change make the following commands correctly detect the 4B
however there may be an issue with reading GPIO inputs on the 4B
as they are always returning zero.

The aim of this change is to be the source-equivalent of the binary
package release 2.52[1] which was the last release before upstream
development ceased.

[1] http://wiringpi.com/wiringpi-updated-to-2-52-for-the-raspberry-pi-4b/

gpio/readall.c

@@ -80,7 +80,7 @@ static char *alts [] =
   "IN", "OUT", "ALT5", "ALT4", "ALT0", "ALT1", "ALT2", "ALT3"
 } ;
 
-static int physToWpi [64] = 
+static int physToWpi [64] =
 {
   -1,           // 0
   -1, -1,       // 1, 2
@@ -113,7 +113,7 @@ static int physToWpi [64] =
   -1, -1, -1, -1, -1, -1, -1, -1, -1
 } ;
 
-static char *physNames [64] = 
+static char *physNames [64] =
 {
   NULL,
 
@@ -309,6 +309,8 @@ static void plus2header (int model)
     printf (" +-----+-----+---------+------+---+---Pi 3B+-+---+------+---------+-----+-----+\n") ;
   else if (model == PI_MODEL_3AP)
     printf (" +-----+-----+---------+------+---+---Pi 3A+-+---+------+---------+-----+-----+\n") ;
+  else if (model == PI_MODEL_4B)
+    printf (" +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+\n") ;
   else
     printf (" +-----+-----+---------+------+---+---Pi ?---+---+------+---------+-----+-----+\n") ;
 }
@@ -356,6 +358,7 @@ void doReadall (void)
 	(model == PI_MODEL_2)    ||
 	(model == PI_MODEL_3AP)  ||
 	(model == PI_MODEL_3B)   || (model == PI_MODEL_3BP) ||
+	(model == PI_MODEL_4B)   ||
 	(model == PI_MODEL_ZERO) || (model == PI_MODEL_ZERO_W))
     piPlusReadall (model) ;
   else if ((model == PI_MODEL_CM) || (model == PI_MODEL_CM3) || ((model == PI_MODEL_CM3P)))

wiringPi/wiringPi.c

@@ -237,7 +237,7 @@ const char *piModelNames [20] =
   "Pi 3A+",	// 14
   "Unknown15",	// 15
   "CM3+",	// 16
-  "Unknown17",	// 17
+  "Pi 4B",	// 17
   "Unknown18",	// 18
   "Unknown19",	// 19
 } ;
@@ -818,7 +818,7 @@ int piGpioLayout (void)
 
   for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
     *c = 0 ;
-  
+
   if (wiringPiDebug)
     printf ("piGpioLayout: Revision string: %s\n", line) ;
 
@@ -887,7 +887,7 @@ int piBoardRev (void)
  *	So the distinction between boards that I can see is:
  *
  *		0000 - Error
- *		0001 - Not used 
+ *		0001 - Not used
  *
  *	Original Pi boards:
  *		0002 - Model B,  Rev 1,   256MB, Egoman
@@ -972,7 +972,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
 
   for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
     *c = 0 ;
-  
+
   if (wiringPiDebug)
     printf ("piBoardId: Revision string: %s\n", line) ;
 
@@ -1011,7 +1011,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
     bMfg      = (revision & (0x0F << 16)) >> 16 ;
     bMem      = (revision & (0x07 << 20)) >> 20 ;
     bWarranty = (revision & (0x03 << 24)) != 0 ;
-    
+
     *model    = bType ;
     *rev      = bRev ;
     *mem      = bMem ;
@@ -1038,7 +1038,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
 // If longer than 4, we'll assume it's been overvolted
 
     *warranty = strlen (c) > 4 ;
-  
+
 // Extract last 4 characters:
 
     c = c + strlen (c) - 4 ;
@@ -1078,7 +1078,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
     else                              { *model = 0           ; *rev = 0              ; *mem =   0 ; *maker = 0 ;               }
   }
 }
- 
+
 
 
 /*
@@ -1264,7 +1264,7 @@ void gpioClockSet (int pin, int freq)
     pin = physToGpio [pin] ;
   else if (wiringPiMode != WPI_MODE_GPIO)
     return ;
-  
+
   divi = 19200000 / freq ;
   divr = 19200000 % freq ;
   divf = (int)((double)divr * 4096.0 / 19200000.0) ;
@@ -1510,7 +1510,7 @@ void pullUpDnControl (int pin, int pud)
 
     *(gpio + GPPUD)              = pud & 3 ;		delayMicroseconds (5) ;
     *(gpio + gpioToPUDCLK [pin]) = 1 << (pin & 31) ;	delayMicroseconds (5) ;
-    
+
     *(gpio + GPPUD)              = 0 ;			delayMicroseconds (5) ;
     *(gpio + gpioToPUDCLK [pin]) = 0 ;			delayMicroseconds (5) ;
   }
@@ -1684,7 +1684,7 @@ void pwmWrite (int pin, int value)
 
 /*
  * analogRead:
- *	Read the analog value of a given Pin. 
+ *	Read the analog value of a given Pin.
  *	There is no on-board Pi analog hardware,
  *	so this needs to go to a new node.
  *********************************************************************************
@@ -1703,7 +1703,7 @@ int analogRead (int pin)
 
 /*
  * analogWrite:
- *	Write the analog value to the given Pin. 
+ *	Write the analog value to the given Pin.
  *	There is no on-board Pi analog hardware,
  *	so this needs to go to a new node.
  *********************************************************************************
@@ -1752,7 +1752,7 @@ void pwmToneWrite (int pin, int freq)
  *	Write an 8-bit byte to the first 8 GPIO pins - try to do it as
  *	fast as possible.
  *	However it still needs 2 operations to set the bits, so any external
- *	hardware must not rely on seeing a change as there will be a change 
+ *	hardware must not rely on seeing a change as there will be a change
  *	to set the outputs bits to zero, then another change to set the 1's
  *	Reading is just bit fiddling.
  *	These are wiringPi pin numbers 0..7, or BCM_GPIO pin numbers
@@ -1808,7 +1808,7 @@ unsigned int digitalReadByte (void)
       data = (data << 1) | x ;
     }
   }
-  else 
+  else
   {
     raw = *(gpio + gpioToGPLEV [0]) ; // First bank for these pins
     for (pin = 0 ; pin < 8 ; ++pin)
@@ -1865,7 +1865,7 @@ unsigned int digitalReadByte2 (void)
       data = (data << 1) | x ;
     }
   }
-  else 
+  else
     data = ((*(gpio + gpioToGPLEV [0])) >> 20) & 0xFF ; // First bank for these pins
 
   return data ;
@@ -2277,7 +2277,7 @@ int wiringPiSetup (void)
 
 // Open the master /dev/ memory control device
 // Device strategy: December 2016:
-//	Try /dev/mem. If that fails, then 
+//	Try /dev/mem. If that fails, then
 //	try /dev/gpiomem. If that fails then game over.
 
   if ((fd = open ("/dev/mem", O_RDWR | O_SYNC | O_CLOEXEC)) < 0)
@@ -2315,13 +2315,13 @@ int wiringPiSetup (void)
   pwm = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PWM) ;
   if (pwm == MAP_FAILED)
     return wiringPiFailure (WPI_ALMOST, "wiringPiSetup: mmap (PWM) failed: %s\n", strerror (errno)) ;
- 
+
 //	Clock control (needed for PWM)
 
   clk = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_CLOCK_BASE) ;
   if (clk == MAP_FAILED)
     return wiringPiFailure (WPI_ALMOST, "wiringPiSetup: mmap (CLOCK) failed: %s\n", strerror (errno)) ;
- 
+
 //	The drive pads
 
   pads = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PADS) ;
@@ -2441,7 +2441,7 @@ int wiringPiSetupSys (void)
 
 // Open and scan the directory, looking for exported GPIOs, and pre-open
 //	the 'value' interface to speed things up for later
-  
+
   for (pin = 0 ; pin < 64 ; ++pin)
   {
     sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;

wiringPi/wiringPi.h

@@ -102,6 +102,7 @@
 #define	PI_MODEL_3BP 		13
 #define	PI_MODEL_3AP 		14
 #define	PI_MODEL_CM3P 		16
+#define	PI_MODEL_4B 		17
 
 #define	PI_VERSION_1		0
 #define	PI_VERSION_1_1		1
@@ -134,7 +135,7 @@ extern const int   piMemorySize    [ 8] ;
 // wiringPiNodeStruct:
 //	This describes additional device nodes in the extended wiringPi
 //	2.0 scheme of things.
-//	It's a simple linked list for now, but will hopefully migrate to 
+//	It's a simple linked list for now, but will hopefully migrate to
 //	a binary tree for efficiency reasons - but then again, the chances
 //	of more than 1 or 2 devices being added are fairly slim, so who
 //	knows....
@@ -211,7 +212,7 @@ extern          void pwmWrite            (int pin, int value) ;
 extern          int  analogRead          (int pin) ;
 extern          void analogWrite         (int pin, int value) ;
 
-// PiFace specifics 
+// PiFace specifics
 //	(Deprecated)
 
 extern int  wiringPiSetupPiFace (void) ;