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Commit 151ef38f authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

[PATCH] 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: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0edb5860

drivers/base/bus.c

+30 −0
Original line number Diff line number Diff line
@@ -133,6 +133,34 @@ static struct kobj_type ktype_bus = { 
decl_subsys(bus, &ktype_bus, NULL);





/* Manually detach a device from it's associated driver. */

static int driver_helper(struct device *dev, void *data)

{

	const char *name = data;



	if (strcmp(name, dev->bus_id) == 0)

		return 1;

	return 0;

}



static ssize_t driver_unbind(struct device_driver *drv,

			     const char *buf, size_t count)

{

	struct bus_type *bus = get_bus(drv->bus);

	struct device *dev;

	int err = -ENODEV;



	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);

	if ((dev) &&

	    (dev->driver == drv)) {

		device_release_driver(dev);

		err = count;

	}

	return err;

}

static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);





static struct device * next_device(struct klist_iter * i)

{

	struct klist_node * n = klist_next(i);
@@ -396,6 +424,7 @@ int bus_add_driver(struct device_driver * drv) 
		module_add_driver(drv->owner, drv);



		driver_add_attrs(bus, drv);

		driver_create_file(drv, &driver_attr_unbind);

	}

	return error;

}
@@ -413,6 +442,7 @@ int bus_add_driver(struct device_driver * drv) 
void bus_remove_driver(struct device_driver * drv)

{

	if (drv->bus) {

		driver_remove_file(drv, &driver_attr_unbind);

		driver_remove_attrs(drv->bus, drv);

		klist_remove(&drv->knode_bus);

		pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);