#221

gpio/gpio.c

@@ -1377,10 +1377,20 @@ static void doVersion (char *argv [])
     }
   }
 
-  if (wiringPiUserLevelAccess())		// User level GPIO is GO
-    printf ("  * This Raspberry Pi supports user-level GPIO access.\n") ;
-  else
-    printf ("  * Root or sudo required for GPIO access.\n") ;
+  int bGlobalAccess = wiringPiGlobalMemoryAccess();		// User level GPIO is GO
+  switch(bGlobalAccess) {
+    case 1:
+        printf ("  * This system supports basic user-level GPIO access via /dev/mem.\n") ;
+        break;
+    case 2:
+        printf ("  * This system supports full  user-level GPIO access via /dev/mem.\n") ;
+        break;
+  }
+  if (wiringPiUserLevelAccess()) {
+        printf ("  * This system supports basic user-level GPIO access via /dev/gpiomem.\n") ;
+  } else if(0==bGlobalAccess) {
+        printf ("  * This system may require root or sudo for GPIO access.\n") ;
+  }
 }
 
 

wiringPi/wiringPi.c

@@ -2522,6 +2522,10 @@ int wiringPiUserLevelAccess(void)
   struct stat statBuf ;
   const char* gpiomemModule = gpiomem_BCM;
 
+  if (RaspberryPiModel<0) { //need to detect pi model
+    int   model, rev, mem, maker, overVolted ;
+    piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
+  }
   if (PI_MODEL_5 == RaspberryPiModel) {
     gpiomemModule = gpiomem_RP1;
   }
@@ -2530,6 +2534,61 @@ int wiringPiUserLevelAccess(void)
 }
 
 
+int wiringPiGlobalMemoryAccess(void)
+{
+  const char* gpiomemGlobal;
+  int fd=-1;
+  unsigned int MMAP_size;
+  unsigned int BaseAddr, PWMAddr;
+
+  if (RaspberryPiModel<0) { //need to detect pi model
+    int   model, rev, mem, maker, overVolted ;
+    piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
+  }
+  if (PI_MODEL_5 == RaspberryPiModel) {
+    gpiomemGlobal = pciemem_RP1;
+    MMAP_size = pciemem_RP1_Size;
+    BaseAddr  = (RP1_IO0_Addr-RP1_BASE_Addr) ;
+    PWMAddr	  = RP1_PWM0_Addr-RP1_BASE_Addr;
+  } else {
+    gpiomemGlobal = gpiomem_global;
+    MMAP_size = BLOCK_SIZE;
+    BaseAddr	= piGpioBase + 0x00200000 ;
+    PWMAddr	  = piGpioBase + 0x0020C000 ;
+  }
+
+  if ((fd = open (gpiomemGlobal, O_RDWR | O_SYNC | O_CLOEXEC)) >0) {
+    int returnvalue = 1; // OK
+
+    uint32_t * lgpio = (uint32_t *)mmap(0, MMAP_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, BaseAddr) ;
+    if (lgpio == MAP_FAILED) {
+      returnvalue = 0;
+      if (wiringPiDebug)
+        fprintf(stderr,"wiringPiGlobalMemoryAccess: mmap (GPIO) failed: %s\n", strerror (errno)) ;
+    } else {
+      munmap(lgpio, MMAP_size);
+      if (PI_MODEL_5 == RaspberryPiModel) {
+        returnvalue = 2;    // GPIO & PWM accessible (same area, nothing to mmap)
+      } else {
+        //check PWM area
+        uint32_t* lpwm = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, PWMAddr) ;
+        if (lpwm == MAP_FAILED) {
+          returnvalue = 1;    // only GPIO accessible
+          if (wiringPiDebug)
+            fprintf(stderr,"wiringPiGlobalMemoryAccess: mmap (PWM) failed: %s\n", strerror (errno)) ;
+        } else {
+          returnvalue = 2;  // GPIO & PWM accessible
+          munmap(lpwm, BLOCK_SIZE);
+        }
+      }
+    }
+
+    close(fd);
+    return returnvalue;
+  }
+  return 0;  // Failed!
+}
+
 /*
  * wiringPiSetup:
  *	Must be called once at the start of your program execution.
@@ -2633,9 +2692,12 @@ int wiringPiSetup (void)
     gpiomemModule = gpiomem_RP1;
   }
 
+  usingGpioMem = FALSE;
   if (gpiomemGlobal==NULL || (fd = open (gpiomemGlobal, O_RDWR | O_SYNC | O_CLOEXEC)) < 0)
   {
-
+    if (wiringPiDebug) {
+      printf ("wiringPi: no access to %s try %s\n", gpiomemGlobal, gpiomemModule) ;
+    }
     if (gpiomemModule && (fd = open (gpiomemModule, O_RDWR | O_SYNC | O_CLOEXEC) ) >= 0)	// We're using gpiomem
     {
       piGpioBase   = 0 ;
@@ -2648,7 +2710,7 @@ int wiringPiSetup (void)
 	"  Try running with sudo?\n", gpiomemGlobal, gpiomemModule, strerror (errno)) ;
   }
   if (wiringPiDebug) {
-    printf ("wiringPi: access to %s succeded\n", usingGpioMem ? gpiomemModule : gpiomemGlobal) ;
+    printf ("wiringPi: access to %s succeded %d\n", usingGpioMem ? gpiomemModule : gpiomemGlobal, fd) ;
   }
 //	GPIO:
  if (PI_MODEL_5 != model) {

wiringPi/wiringPi.h

@@ -208,6 +208,7 @@ extern struct wiringPiNodeStruct *wiringPiNewNode  (int pinBase, int numPins) ;
 extern int GPIOToSysFS(const int pin) ;
 
 extern void wiringPiVersion	(int *major, int *minor) ;
+extern int  wiringPiGlobalMemoryAccess(void);         //Interface 3.3
 extern int  wiringPiUserLevelAccess (void) ;
 extern int  wiringPiSetup       (void) ;
 extern int  wiringPiSetupSys    (void) ;