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authorGreg Kroah-Hartman <gregkh@suse.de>2005-06-22 16:09:05 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-29 22:48:04 -0700
commitafdce75f1eaebcf358b7594ba7969aade105c3b0 (patch)
tree5374a0e85e03c8706a1dd95478b9d0a3312917e0 /drivers/base/bus.c
parent151ef38f7c0ec1b0420f04438b0316e3a30bf2e4 (diff)
downloadop-kernel-dev-afdce75f1eaebcf358b7594ba7969aade105c3b0.zip
op-kernel-dev-afdce75f1eaebcf358b7594ba7969aade105c3b0.tar.gz
[PATCH] driver core: Add the ability to bind drivers to devices from userspace
This adds a single file, "bind", to the sysfs directory of every driver registered with the driver core. To bind a device to a driver, write the bus id of the device you wish to bind to that specific driver to the "bind" file (remember to not add a trailing \n). If that bus id matches a device on that bus, and it does not currently have a driver bound to it, the probe sequence will be initiated with that driver and device. Note, this requires that the driver itself be willing and able to accept that device (usually through a device id type table). This patch does not make it possible to override the driver's id table. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/bus.c')
-rw-r--r--drivers/base/bus.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index fa41ee9..7e17488 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -160,6 +160,30 @@ static ssize_t driver_unbind(struct device_driver *drv,
}
static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);
+/*
+ * Manually attach a device to a driver.
+ * Note: the driver must want to bind to the device,
+ * it is not possible to override the driver's id table.
+ */
+static ssize_t driver_bind(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 == NULL)) {
+ down(&dev->sem);
+ err = driver_probe_device(drv, dev);
+ up(&dev->sem);
+ put_device(dev);
+ }
+ return err;
+}
+static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);
+
static struct device * next_device(struct klist_iter * i)
{
@@ -425,6 +449,7 @@ int bus_add_driver(struct device_driver * drv)
driver_add_attrs(bus, drv);
driver_create_file(drv, &driver_attr_unbind);
+ driver_create_file(drv, &driver_attr_bind);
}
return error;
}
@@ -442,6 +467,7 @@ 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_bind);
driver_remove_file(drv, &driver_attr_unbind);
driver_remove_attrs(drv->bus, drv);
klist_remove(&drv->knode_bus);
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