From foo@baz Wed Jun 22 08:12:42 2005 Date: Wed, 22 Jun 2005 16:09:05 -0700 From: Greg Kroah-Hartman To: Greg KH Subject: driver core: Add the ability to unbind drivers to devices from userspace This adds a single file, "unbind", to the sysfs directory of every device that is currently bound to a driver. To unbind the driver from the device, write anything to this file and they will be disconnected from each other. Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 11 +++++++++++ 1 files changed, 11 insertions(+) --- gregkh-2.6.orig/drivers/base/dd.c 2005-06-22 17:56:48.000000000 -0700 +++ gregkh-2.6/drivers/base/dd.c 2005-06-22 17:56:59.000000000 -0700 @@ -23,6 +23,15 @@ #define to_drv(node) container_of(node, struct device_driver, kobj.entry) +/* manually detach a device from it's associated driver. */ +/* Any write will cause it to happen. */ +static ssize_t device_unbind(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + device_release_driver(dev); + return count; +} +static DEVICE_ATTR(unbind, S_IWUSR, NULL, device_unbind); /** * device_bind_driver - bind a driver to one device. @@ -46,6 +55,7 @@ sysfs_create_link(&dev->driver->kobj, &dev->kobj, kobject_name(&dev->kobj)); sysfs_create_link(&dev->kobj, &dev->driver->kobj, "driver"); + device_create_file(dev, &dev_attr_unbind); } /** @@ -191,6 +201,7 @@ get_driver(drv); sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj)); sysfs_remove_link(&dev->kobj, "driver"); + device_remove_file(dev, &dev_attr_unbind); klist_remove(&dev->knode_driver); if (drv->remove)