From a05e5f31788b102fbf47060439852a490b3342a6 Mon Sep 17 00:00:00 2001
From: nsouch <nsouch@FreeBSD.org>
Date: Sat, 13 Feb 1999 18:01:55 +0000
Subject: Handle correctly iicbus request/release mechanism. Add iicbus
 allocation to the general purpose i/o iic(4) driver.

---
 sys/dev/iicbus/iic.c    | 20 +++++++++++++++++++-
 sys/dev/iicbus/iiconf.c | 17 +++++++++--------
 2 files changed, 28 insertions(+), 9 deletions(-)

(limited to 'sys/dev/iicbus')

diff --git a/sys/dev/iicbus/iic.c b/sys/dev/iicbus/iic.c
index e41d08b..6bcadf9 100644
--- a/sys/dev/iicbus/iic.c
+++ b/sys/dev/iicbus/iic.c
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: iic.c,v 1.5 1998/12/07 21:58:16 archie Exp $
+ *	$Id: iic.c,v 1.6 1999/01/09 18:08:24 nsouch Exp $
  *
  */
 #include <sys/param.h>
@@ -35,6 +35,7 @@
 #include <sys/buf.h>
 #include <sys/uio.h>
 #include <sys/malloc.h>
+#include <sys/fcntl.h>
 
 #include <machine/clock.h>
 
@@ -169,12 +170,17 @@ iicwrite(dev_t dev, struct uio * uio, int ioflag)
 	if (sc->sc_count == 0)
 		return (EINVAL);
 
+	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
+		return (error);
+
 	count = min(uio->uio_resid, BUFSIZE);
 	uiomove(sc->sc_buffer, count, uio);
 
 	error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
 					sc->sc_buffer, count, &sent);
 
+	iicbus_release_bus(device_get_parent(iicdev), iicdev);
+
 	return(error);
 }
 
@@ -192,6 +198,9 @@ iicread(dev_t dev, struct uio * uio, int ioflag)
 	if (sc->sc_count == 0)
 		return (EINVAL);
 
+	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
+		return (error);
+
 	/* max amount of data to read */
 	len = min(uio->uio_resid, BUFSIZE);
 
@@ -202,6 +211,8 @@ iicread(dev_t dev, struct uio * uio, int ioflag)
 	if (bufsize > uio->uio_resid)
 		panic("%s: too much data read!", __FUNCTION__);
 
+	iicbus_release_bus(device_get_parent(iicdev), iicdev);
+
 	return (uiomove(sc->sc_inbuf, bufsize, uio));
 }
 
@@ -217,6 +228,11 @@ iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
 	if (!sc)
 		return (EINVAL);
 
+	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
+			(flags & O_NONBLOCK) ? IIC_DONTWAIT :
+						(IIC_WAIT | IIC_INTR))))
+		return (error);
+
 	switch (cmd) {
 	case I2CSTART:
 		error = iicbus_start(parent, s->slave, 0);
@@ -242,6 +258,8 @@ iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
 		error = ENODEV;
 	}
 
+	iicbus_release_bus(device_get_parent(iicdev), iicdev);
+
 	return (error);
 }
 
diff --git a/sys/dev/iicbus/iiconf.c b/sys/dev/iicbus/iiconf.c
index b84a6cd..5727c05 100644
--- a/sys/dev/iicbus/iiconf.c
+++ b/sys/dev/iicbus/iiconf.c
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: iiconf.c,v 1.5 1999/01/28 15:59:15 roger Exp $
+ *	$Id: iiconf.c,v 1.6 1999/02/06 10:56:09 roger Exp $
  *
  */
 #include <sys/param.h>
@@ -104,16 +104,12 @@ iicbus_request_bus(device_t bus, device_t dev, int how)
 	int s, error = 0;
 
 	/* first, ask the underlying layers if the request is ok */
-	do {
-		error = IICBUS_CALLBACK(device_get_parent(bus),
-						IIC_REQUEST_BUS, (caddr_t)&how);
-		if (error)
-			error = iicbus_poll(sc, how);
-	} while (error);
+	error = IICBUS_CALLBACK(device_get_parent(bus), IIC_REQUEST_BUS,
+				(caddr_t)&how);
 
 	while (!error) {
 		s = splhigh();	
-		if (sc->owner) {
+		if (sc->owner && sc->owner != dev) {
 			splx(s);
 
 			error = iicbus_poll(sc, how);
@@ -123,6 +119,11 @@ iicbus_request_bus(device_t bus, device_t dev, int how)
 			splx(s);
 			return (0);
 		}
+
+		/* free any allocated resource */
+		if (error)
+			IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS,
+					(caddr_t)&how);
 	}
 
 	return (error);
-- 
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