From 45daef0fdcc44f6af86fdebc4fc7eb7c79375398 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Fri, 23 Jul 2010 19:56:18 +0900 Subject: [PATCH] Driver core: Add BUS_NOTIFY_BIND_DRIVER Add BUS_NOTIFY_BIND_DRIVER as a bus notifier event. For driver binding/unbinding we with this in place have the following bus notifier events: - BUS_NOTIFY_BIND_DRIVER - before ->probe() - BUS_NOTIFY_BOUND_DRIVER - after ->probe() - BUS_NOTIFY_UNBIND_DRIVER - before ->remove() - BUS_NOTIFY_UNBOUND_DRIVER - after ->remove() The event BUS_NOTIFY_BIND_DRIVER allows bus code to be notified that ->probe() is about to be called. Useful for bus code that needs to setup hardware before the driver gets to run. With this in place platform drivers can be loaded and unloaded as modules and the new BIND event allows bus code to control for instance device clocks that must be enabled before the driver can be executed. Without this patch there is no way for the bus code to get notified that a modular driver is about to be probed. Signed-off-by: Magnus Damm Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 4 ++++ include/linux/device.h | 8 +++++--- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 503c2620bbc..da57ee9d63f 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -51,6 +51,10 @@ static int driver_sysfs_add(struct device *dev) { int ret; + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, + BUS_NOTIFY_BIND_DRIVER, dev); + ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, kobject_name(&dev->kobj)); if (ret == 0) { diff --git a/include/linux/device.h b/include/linux/device.h index ddffdf7da39..0ca24e93304 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -109,10 +109,12 @@ extern int bus_unregister_notifier(struct bus_type *bus, */ #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */ #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */ -#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */ -#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be +#define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be + bound */ +#define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */ +#define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be unbound */ -#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound +#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound from the device */ extern struct kset *bus_get_kset(struct bus_type *bus); -- 2.20.1