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author | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-22 16:09:05 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-29 22:48:04 -0700 |
commit | 151ef38f7c0ec1b0420f04438b0316e3a30bf2e4 (patch) | |
tree | 3aa6504e12c08f70cacb7f9de6ef5858b45ee86d /drivers/base | |
parent | 0edb586049e57c56e625536476931117a57671e9 (diff) | |
download | linux-3.10-151ef38f7c0ec1b0420f04438b0316e3a30bf2e4.tar.gz linux-3.10-151ef38f7c0ec1b0420f04438b0316e3a30bf2e4.tar.bz2 linux-3.10-151ef38f7c0ec1b0420f04438b0316e3a30bf2e4.zip |
[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>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/bus.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 2c64b792d07..fa41ee90a53 100644 --- 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 * 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); |