diff --git a/sys/dev/iicbus/iiconf.c b/sys/dev/iicbus/iiconf.c
index 27c8464bd353..0d62dd3bd893 100644
--- a/sys/dev/iicbus/iiconf.c
+++ b/sys/dev/iicbus/iiconf.c
@@ -470,3 +470,55 @@ iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
 		iicbus_stop(bus);
 	return (error);
 }
+
+int
+iicdev_readfrom(device_t slavedev, uint8_t regaddr, void *buffer,
+    uint16_t buflen, int waithow)
+{
+	struct iic_msg msgs[2];
+	uint8_t slaveaddr;
+
+	/*
+	 * Two transfers back to back with a repeat-start between them; first we
+	 * write the address-within-device, then we read from the device.
+	 */
+	slaveaddr = iicbus_get_addr(slavedev);
+
+	msgs[0].slave = slaveaddr;
+	msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
+	msgs[0].len   = 1;
+	msgs[0].buf   = &regaddr;
+
+	msgs[1].slave = slaveaddr;
+	msgs[1].flags = IIC_M_RD;
+	msgs[1].len   = buflen;
+	msgs[1].buf   = buffer;
+
+	return (iicbus_transfer_excl(slavedev, msgs, nitems(msgs), waithow));
+}
+
+int iicdev_writeto(device_t slavedev, uint8_t regaddr, void *buffer,
+    uint16_t buflen, int waithow)
+{
+	struct iic_msg msgs[2];
+	uint8_t slaveaddr;
+
+	/*
+	 * Two transfers back to back with no stop or start between them; first
+	 * we write the address then we write the data to that address, all in a
+	 * single transfer from two scattered buffers.
+	 */
+	slaveaddr = iicbus_get_addr(slavedev);
+
+	msgs[0].slave = slaveaddr;
+	msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
+	msgs[0].len   = 1;
+	msgs[0].buf   = &regaddr;
+
+	msgs[1].slave = slaveaddr;
+	msgs[1].flags = IIC_M_WR | IIC_M_NOSTART;
+	msgs[1].len   = buflen;
+	msgs[1].buf   = buffer;
+
+	return (iicbus_transfer_excl(slavedev, msgs, nitems(msgs), waithow));
+}
diff --git a/sys/dev/iicbus/iiconf.h b/sys/dev/iicbus/iiconf.h
index 03b958346dc0..856b029af9ff 100644
--- a/sys/dev/iicbus/iiconf.h
+++ b/sys/dev/iicbus/iiconf.h
@@ -133,6 +133,16 @@ int iicbus_transfer_excl(device_t bus, struct iic_msg *msgs, uint32_t nmsgs,
     int how);
 int iicbus_transfer_gen(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
 
+/*
+ * Simple register read/write routines, but the "register" can be any size.
+ * The transfers are done with iicbus_transfer_excl().  Reads use a repeat-start
+ * between sending the address and reading; writes use a single start/stop.
+ */
+int iicdev_readfrom(device_t _slavedev, uint8_t _regaddr, void *_buffer,
+    uint16_t _buflen, int _waithow);
+int iicdev_writeto(device_t _slavedev, uint8_t _regaddr, void *_buffer,
+    uint16_t _buflen, int _waithow);
+
 #define IICBUS_MODVER	1
 #define IICBUS_MINVER	1
 #define IICBUS_MAXVER	1