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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Mon, 8 Nov 2010 19:53:16 +0000 (UTC)
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Subject: svn commit: r214999 - head/sys/dev/iicbus
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Author: nwhitehorn
Date: Mon Nov  8 19:53:16 2010
New Revision: 214999
URL: http://svn.freebsd.org/changeset/base/214999

Log:
  Provide support for IIC_M_NOSTOP/IIC_M_NOSTART for bit-banging and
  otherwise low-level controllers.
  
  Reviewed by:	thompsa

Modified:
  head/sys/dev/iicbus/iiconf.c

Modified: head/sys/dev/iicbus/iiconf.c
==============================================================================
--- head/sys/dev/iicbus/iiconf.c	Mon Nov  8 19:52:14 2010	(r214998)
+++ head/sys/dev/iicbus/iiconf.c	Mon Nov  8 19:53:16 2010	(r214999)
@@ -363,7 +363,7 @@ iicbus_transfer(device_t bus, struct iic
 int
 iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
 {
-	int i, error, lenread, lenwrote, nkid;
+	int i, error, lenread, lenwrote, nkid, rpstart, addr;
 	device_t *children, bus;
 
 	if ((error = device_get_children(dev, &children, &nkid)) != 0)
@@ -373,14 +373,38 @@ iicbus_transfer_gen(device_t dev, struct
 		return (EIO);
 	}
 	bus = children[0];
+	rpstart = 0;
 	free(children, M_TEMP);
 	for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
+		addr = msgs[i].slave;
 		if (msgs[i].flags & IIC_M_RD)
-			error = iicbus_block_read(bus, msgs[i].slave,
-			    msgs[i].buf, msgs[i].len, &lenread);
+			addr |= LSB;
 		else
-			error = iicbus_block_write(bus, msgs[i].slave,
-			    msgs[i].buf, msgs[i].len, &lenwrote);
+			addr &= ~LSB;
+
+		if (!(msgs[i].flags & IIC_M_NOSTART)) {
+			if (rpstart)
+				error = iicbus_repeated_start(bus, addr, 0);
+			else
+				error = iicbus_start(bus, addr, 0);
+		}
+
+		if (error)
+			break;
+
+		if (msgs[i].flags & IIC_M_RD)
+			error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
+			    &lenread, IIC_LAST_READ, 0);
+		else
+			error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
+			    &lenwrote, 0);
+
+		if (!(msgs[i].flags & IIC_M_NOSTOP)) {
+			rpstart = 0;
+			iicbus_stop(bus);
+		} else {
+			rpstart = 1;	/* Next message gets repeated start */
+		}
 	}
 	return (error);
 }