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    Subject[PATCH] driver core: Add the ability to unbind drivers to devices from userspace
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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>

    ---
    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);
    -
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