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[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: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Greg Kroah-Hartman 2005-06-22 16:09:05 -07:00
parent 0edb586049
commit 151ef38f7c
1 changed files with 30 additions and 0 deletions
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30
drivers/base/bus.c
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@ -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);