Driver core: add uevent file for bus and driver

This has been in the SuSE kernels for some time now.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 0a8d075f3e6c..6768a01e210b 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -610,6 +610,17 @@ static inline int add_probe_files(struct bus_type *bus) { return 0; }
 static inline void remove_probe_files(struct bus_type *bus) {}
 #endif
 
+static ssize_t driver_uevent_store(struct device_driver *drv,
+                                   const char *buf, size_t count)
+{
+        enum kobject_action action;
+
+        if (kobject_action_type(buf, count, &action) == 0)
+                kobject_uevent(&drv->kobj, action);
+        return count;
+}
+static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store);
+
 /**
  *      bus_add_driver - Add a driver to the bus.
  *      @drv:   driver.
@@ -640,6 +651,11 @@ int bus_add_driver(struct device_driver *drv)
         klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
         module_add_driver(drv->owner, drv);
 
+        error = driver_create_file(drv, &driver_attr_uevent);
+        if (error) {
+                printk(KERN_ERR "%s: uevent attr (%s) failed\n",
+                        __FUNCTION__, drv->name);
+        }
         error = driver_add_attrs(bus, drv);
         if (error) {
                 /* How the hell do we get out of this pickle? Give up */
@@ -677,6 +693,7 @@ void bus_remove_driver(struct device_driver * drv)
 
         remove_bind_files(drv);
         driver_remove_attrs(drv->bus, drv);
+        driver_remove_file(drv, &driver_attr_uevent);
         klist_remove(&drv->knode_bus);
         pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
         driver_detach(drv);
@@ -804,6 +821,17 @@ static void klist_devices_put(struct klist_node *n)
         put_device(dev);
 }
 
+static ssize_t bus_uevent_store(struct bus_type *bus,
+                                const char *buf, size_t count)
+{
+        enum kobject_action action;
+
+        if (kobject_action_type(buf, count, &action) == 0)
+                kobject_uevent(&bus->subsys.kobj, action);
+        return count;
+}
+static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
+
 /**
  *      bus_register - register a bus with the system.
  *      @bus:   bus.
@@ -828,6 +856,10 @@ int bus_register(struct bus_type * bus)
         if (retval)
                 goto out;
 
+        retval = bus_create_file(bus, &bus_attr_uevent);
+        if (retval)
+                goto bus_uevent_fail;
+
         kobject_set_name(&bus->devices.kobj, "devices");
         bus->devices.kobj.parent = &bus->subsys.kobj;
         retval = kset_register(&bus->devices);
@@ -863,6 +895,8 @@ bus_probe_files_fail:
 bus_drivers_fail:
         kset_unregister(&bus->devices);
 bus_devices_fail:
+        bus_remove_file(bus, &bus_attr_uevent);
+bus_uevent_fail:
         subsystem_unregister(&bus->subsys);
 out:
         return retval;
@@ -882,6 +916,7 @@ void bus_unregister(struct bus_type * bus)
         remove_probe_files(bus);
         kset_unregister(&bus->drivers);
         kset_unregister(&bus->devices);
+        bus_remove_file(bus, &bus_attr_uevent);
         subsystem_unregister(&bus->subsys);
 }