ubbctl/: also support decoding and setting of interrupts and alternate functions

ubbctl/README

@@ -30,7 +30,15 @@ respectively.
 pull-up is enabled.
 
 "F0" and "F1" indicate that the pin configured as a function (i.e.,
-for the MMC controller) and does not operate as GPIO.
+for the MMC controller) and does not operate as GPIO. If the second
+function of the pin is selected, "Fb..." is shown instead of "F...".
+
+"I..." indicates that the pin is configured as an interrupt. The
+next letter defines the type of interrupt, "r" for rising edge,
+"f" for falling edge, "h" for high level, and "l" for low level. If
+the pull-up is enabled, ubbctl adds an "R". Finally, it shows the
+pin status. E.g., "IfR1" would be an interrupt triggering on the
+falling edge, with pull-up enabled, and currently inactive.
 
 ubbctl can run in continuous mode, in which it updates the status
 regularly (currently every 200 ms):

ubbctl/ubbctl.c

@@ -1,8 +1,8 @@
 /*
  * ubbctl.c - Set and query UBB signals
  *
- * Written 2013 by Werner Almesberger
+ * Written 2013-2014 by Werner Almesberger
- * Copyright 2013 Werner Almesberger
+ * Copyright 2013-2014 Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,6 +46,23 @@ static void show_pins(void)
 		pin = PIN(p->mask);
 		if (PDFUN & p->mask) {
 			putchar('F');
+			if (PDSEL & p->mask)
+				putchar('b');
+		} else if (PDSEL & p->mask) {
+			putchar('I');
+			if (PDTRG & p->mask) {
+				if (PDDIR & p->mask)
+					putchar('r');
+				else
+					putchar('f');
+			} else {
+				if (PDDIR & p->mask)
+					putchar('h');
+				else
+					putchar('l');
+			}
+			if (!(PDPULL & p->mask))
+				putchar('R');
 		} else if (PDDIR & p->mask) {
 			set = !!(PDDAT & p->mask);
 			if (pin != set)
@@ -65,8 +82,10 @@ static void show_pins(void)
 
 static int setup_pin(const char *s, int doit)
 {
+	static const char trigger[] = "lhfrLHFR";
 	const struct pin *p;
-	const char *eq;
+	const char *eq, *t;
+	uint8_t trig;
 
 	if (!strcasecmp(s, "on"))
 		s = "nPWR=0";
@@ -83,36 +102,86 @@ static int setup_pin(const char *s, int doit)
 	if (!p->name)
 		return 0;
 
-	if (!strcasecmp(eq+1, "f")) {
+	if (!strcasecmp(eq+1, "f") || !strcasecmp(eq+1, "fa")) {
-		if (doit)
+		if (doit) {
 			PDFUNS = p->mask;
-	} else if (!strcmp(eq+1, "0")) {
+			PDSELC = p->mask;
+		}
+		return 1;
+	}
+	if (!strcasecmp(eq+1, "fb")) {
+		if (doit) {
+			PDFUNS = p->mask;
+			PDSELS = p->mask;
+		}
+		return 1;
+	}
+	if (!strcmp(eq+1, "0")) {
 		if (doit) {
 			PDDATC = p->mask;
 			PDDIRS = p->mask;
 			PDFUNC = p->mask;
 		}
-	} else if (!strcmp(eq+1, "1")) {
+		return 1;
+	}
+	if (!strcmp(eq+1, "1")) {
 		if (doit) {
 			PDDATS = p->mask;
 			PDDIRS = p->mask;
 			PDFUNC = p->mask;
 		}
-	} else if (!strcasecmp(eq+1, "r")) {
+		return 1;
+	}
+	if (!strcasecmp(eq+1, "r")) {
 		if (doit) {
 			PDPULLC = p->mask;
 			PDDIRC = p->mask;
 			PDFUNC = p->mask;
+			PDSELC = p->mask;
 		}
-	} else if (!strcasecmp(eq+1, "z")) {
+		return 1;
+	}
+	if (!strcasecmp(eq+1, "z")) {
 		if (doit) {
 			PDPULLS = p->mask;
 			PDDIRC = p->mask;
 			PDFUNC = p->mask;
+			PDSELC = p->mask;
 		}
+		return 1;
+	}
+	if (eq[1] != 'i' && eq[1] != 'I')
+		return 0;
+
+	t = strchr(trigger, eq[2]);
+	if (!t || !*t)
+		return 0;
+
+	if (!eq[3] || eq[3] == 'z' || eq[3] == 'Z') {
+		if (doit)
+			PDPULLS = p->mask;
+	} else if (eq[3] == 'r' || eq[3] == 'R') {
+		if (doit)
+			PDPULLC = p->mask;
 	} else {
 		return 0;
 	}
+
+	if (!doit)
+		return 1;
+
+	PDFUNC = p->mask;
+	PDSELS = p->mask;
+	trig = (t-trigger) & 3;
+	if (trig & 1)
+		PDDIRS = p->mask;
+	else
+		PDDIRC = p->mask;
+	if (trig & 2)
+		PDTRGS = p->mask;
+	else
+		PDTRGC = p->mask;
+
 	return 1;
 }
 
@@ -124,7 +193,7 @@ static void usage(const char *name)
 "       %s name=value|action ...\n\n"
 "  -c  continously update the pin status (until user interrupts)\n\n"
 "Names:   nPWR, CMD, CLK, DAT0, DAT1, DAT2, DAT3\n"
-"Values:  F, 0, 1, Z, R\n"
+"Values:  F, Fa, Fb, 0, 1, Z, R, Ir[R|Z], If[R|Z], Ih[R|Z], Il[R|Z]\n"
 "Actions: ON, OFF\n"
     , name, name);
 	exit(1);