From 1aef11be0e197bfe1c73b553383951011604361a Mon Sep 17 00:00:00 2001
From: Rafal Jaworowski <raj@FreeBSD.org>
Date: Mon, 26 Jan 2009 13:53:39 +0000
Subject: [PATCH] Teach iic(4) the 'repeated start' I2C condition. This will be
 used by the upcoming i2c(8) diag utility.

Reviewed by:	bms, stas
Obtained from:	Semihalf
---
 share/man/man4/iic.4 | 8 +++++++-
 sys/dev/iicbus/iic.c | 5 +++++
 sys/dev/iicbus/iic.h | 1 +
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/share/man/man4/iic.4 b/share/man/man4/iic.4
index 0112ff8a34f1..7d6141ca7377 100644
--- a/share/man/man4/iic.4
+++ b/share/man/man4/iic.4
@@ -45,13 +45,19 @@ In order to control I2C devices, use
 .Pa /dev/iic?
 with the
 following ioctls:
-.Bl -tag -width ".Dv I2CRSTCARD"
+.Bl -tag -width ".Dv I2CRPTSTART"
 .It Dv I2CSTART
 .Pq Vt "struct iiccmd"
 Sends the start condition to the slave specified by the
 .Va slave
 element to the bus.
 All other elements are ignored.
+.It Dv I2CRPTSTART
+.Pq Vt "struct iiccmd"
+Sends the repeated start condition to the slave specified by the
+.Va slave
+element to the bus.
+All other elements are ignored.
 .It Dv I2CSTOP
 No argument is passed.
 Sends the stop condition to the bus.
diff --git a/sys/dev/iicbus/iic.c b/sys/dev/iicbus/iic.c
index ebc167deec67..673d635d02b0 100644
--- a/sys/dev/iicbus/iic.c
+++ b/sys/dev/iicbus/iic.c
@@ -368,6 +368,11 @@ iicioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *t
 		}
 		free(usrbufs, M_TEMP);
 		break;
+
+	case I2CRPTSTART:
+		error = iicbus_repeated_start(parent, s->slave, 0);
+		break;
+
 	default:
 		error = ENOTTY;
 	}
diff --git a/sys/dev/iicbus/iic.h b/sys/dev/iicbus/iic.h
index 471f9768d2a6..bc29fa01518e 100644
--- a/sys/dev/iicbus/iic.h
+++ b/sys/dev/iicbus/iic.h
@@ -60,5 +60,6 @@ struct iic_rdwr_data {
 #define I2CWRITE	_IOW('i', 4, struct iiccmd)	/* send data */
 #define I2CREAD		_IOW('i', 5, struct iiccmd)	/* receive data */
 #define I2CRDWR		_IOW('i', 6, struct iic_rdwr_data)	/* General read/write interface */
+#define I2CRPTSTART	_IOW('i', 7, struct iiccmd)	/* repeated start */
 
 #endif