There are certain bus types (notably MCA and parisc internal ones) that like
to do generic houskeeping operations (claim slots, claim uniform resources
etc.) when drivers are attached to devices.
I've added a fairly generic notifier callback to the bus_type so that these
busses can intercept and process the events they're interested in.
At the moment, the only events are attachment and detachment of drivers but in
principle, more could be added.
James
You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.
===================================================================
ChangeSet@1.928, 2002-12-04 10:21:28-06:00, jejb@raven.il.steeleye.com
make bus notify events more general in generic device model
ChangeSet@1.927, 2002-12-03 14:16:53-06:00, jejb@raven.il.steeleye.com
add device model bus notifier
This adds a bus notifier (per bus type) which is called after a device
driver successfully attaches to a device. The idea behind this is
that there are certain operations that need to be performed globally
after driver attachment (bus resource claiming etc.). This notifier
is set by the bus so that it can do these.
drivers/base/bus.c | 4 ++++
include/linux/device.h | 9 +++++++++
2 files changed, 13 insertions(+)
diff -Nru a/drivers/base/bus.c b/drivers/base/bus.c
--- a/drivers/base/bus.c Wed Dec 4 11:05:18 2002
+++ b/drivers/base/bus.c Wed Dec 4 11:05:18 2002
@@ -145,6 +145,8 @@
dev->bus_id,dev->driver->name);
list_add_tail(&dev->driver_list,&dev->driver->devices);
sysfs_create_link(&dev->driver->kobj,&dev->kobj,dev->kobj.name);
+ if(dev->bus && dev->bus->notify)
+ dev->bus->notify(dev, BUS_NOTIFIER_DRIVER_ATTACHED);
}
@@ -260,6 +262,8 @@
if (drv->remove)
drv->remove(dev);
dev->driver = NULL;
+ if(dev->bus && dev->bus->notify)
+ dev->bus->notify(dev, BUS_NOTIFIER_DRIVER_DETACHED);
}
}
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h Wed Dec 4 11:05:18 2002
+++ b/include/linux/device.h Wed Dec 4 11:05:18 2002
@@ -58,6 +58,13 @@
DEVICE_GONE = 3,
};
+/* bus notifier events: events that the bus type may choose to be notified
+ * about */
+enum bus_notifier {
+ BUS_NOTIFIER_DRIVER_ATTACHED,
+ BUS_NOTIFIER_DRIVER_DETACHED,
+};
+
struct device;
struct device_driver;
struct device_class;
@@ -75,6 +82,8 @@
struct device * (*add) (struct device * parent, char * bus_id);
int (*hotplug) (struct device *dev, char **envp,
int num_envp, char *buffer, int buffer_size);
+ /* notify the bus that something happened */
+ void (*notify)(struct device *dev, enum bus_notifier event);
};
===================================================================
This BitKeeper patch contains the following changesets:
1.927..1.928
## Wrapped with gzip_uu ##
begin 664 bkpatch486
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`
end
-
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