Greg KH
2005-06-30T06:10:29Z

[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>

---
commit 151ef38f7c0ec1b0420f04438b0316e3a30bf2e4
tree 3aa6504e12c08f70cacb7f9de6ef5858b45ee86d
parent 0edb586049e57c56e625536476931117a57671e9
author Greg Kroah-Hartman <gregkh@suse.de> Wed, 22 Jun 2005 16:09:05 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> Wed, 29 Jun 2005 22:48:04 -0700

drivers/base/bus.c | 30 ++++++++++++++++++++++++++++++
1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -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
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
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);