pc, pc64: provide access to embedded controller with #P/ec file

1 files changed, 26 insertions, 2 deletions

diff --git a/sys/src/9/pc/devarch.c b/sys/src/9/pc/devarch.c
index 9265e2696..3d3ef0c1b 100644
--- a/sys/src/9/pc/devarch.c
+++ b/sys/src/9/pc/devarch.c
@@ -34,6 +34,7 @@ enum {
 	Qiow,
 	Qiol,
 	Qmsr,
+	Qec,
 	Qbase,
 
 	Qmax = 16,
@@ -62,7 +63,8 @@ static Dirtab archdir[Qmax] = {
 	"iob",		{ Qiob, 0 },		0,	0660,
 	"iow",		{ Qiow, 0 },		0,	0660,
 	"iol",		{ Qiol, 0 },		0,	0660,
-	"msr",	{ Qmsr, 0},	0,	0660,
+	"msr",		{ Qmsr, 0 },		0,	0660,
+	"ec",		{ Qec, 0 },		0,	0660,
 };
 Lock archwlock;	/* the lock is only for changing archdir */
 int narchdir = Qbase;
@@ -361,7 +363,7 @@ static long
 archread(Chan *c, void *a, long n, vlong offset)
 {
 	char *buf, *p;
-	int port;
+	int port, v;
 	ushort *sp;
 	ulong *lp;
 	vlong *vp;
@@ -407,6 +409,19 @@ archread(Chan *c, void *a, long n, vlong offset)
 				error(Ebadarg);
 		return n;
 
+	case Qec:
+		if(offset >= 256)
+			error(Ebadarg);
+		if(offset+n > 256)
+			n = 256 - offset;
+		p = a;
+		for(port = offset; port < offset+n; port++){
+			if((v = ecread(port)) < 0)
+				error(Eio);
+			*p++ = v;
+		}
+		return n;
+
 	case Qioalloc:
 		break;
 
@@ -486,6 +501,15 @@ archwrite(Chan *c, void *a, long n, vlong offset)
 				error(Ebadarg);
 		return n;
 
+	case Qec:
+		if(offset+n > 256)
+			error(Ebadarg);
+		p = a;
+		for(port = offset; port < offset+n; port++)
+			if(ecwrite(port, *p++) < 0)
+				error(Eio);
+		return n;
+
 	default:
 		if(c->qid.path < narchdir && (fn = writefn[c->qid.path]))
 			return fn(c, a, n, offset);