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aux/acpi: connect EC region handler, fixes battery status on eeepc 1000px (thanks Peter Kosyh)

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -84,7 +84,42 @@

 	{{Qctl},			"ctl",		0666,		ctlread,		ctlwrite},

 };

+static char*

+eisaid(void *v)

+{

+	static char id[8];

+	ulong b, l;

+	int i;

+

+	if(amltag(v) == 's')

+		return v;

+	b = amlint(v);

+	for(l = 0, i=24; i>=0; i -= 8, b >>= 8)

+		l |= (b & 0xFF) << i;

+	id[7] = 0;

+	for(i=6; i>=3; i--, l >>= 4)

+		id[i] = "0123456789ABCDEF"[l & 0xF];

+	for(i=2; i>=0; i--, l >>= 5)

+		id[i] = '@' + (l & 0x1F);

+	return id;

+}

+

 static int

+enumec(void *dot, void *)

+{

+	void *p;

+	char *id;

+	id = eisaid(amlval(amlwalk(dot, "^_HID")));

+	if (id == nil || strcmp(id, "PNP0C09") != 0)

+		return 1;

+	p = amlwalk(dot, "^_REG");

+	if (p != nil) {

+		amleval(p, "ii", 0x3, 1, nil);

+	}

+	return 1;

+}

+

+static int

 enumbat(void *dot, void *)

 {

 	void *p, *r, **rr;

@@ -501,6 +536,7 @@

 	}

 	close(fd);

+	amlenum(amlroot, "_HID", enumec, nil);

 	amlenum(amlroot, "_BIF", enumbat, nil);

 	amlenum(amlroot, "_PSL", enumtmp, nil);