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;
+ }
+ if (err)
+ return err;
+ return count;
+}
+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);
+ }
+ if (err)
+ return err;
+ return count;
+}
+static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);
+
+
static struct device * next_device(struct klist_iter * i)
{
struct klist_node * n = klist_next(i);
return error;
}
+/**
+ * bus_find_device - device iterator for locating a particular device.
+ * @bus: bus type
+ * @start: Device to begin with
+ * @data: Data to pass to match function
+ * @match: Callback function to check device
+ *
+ * This is similar to the bus_for_each_dev() function above, but it
+ * returns a reference to a device that is 'found' for later use, as
+ * determined by the @match callback.
+ *
+ * The callback should return 0 if the device doesn't match and non-zero
+ * if it does. If the callback returns non-zero, this function will
+ * return to the caller and not iterate over any more devices.
+ */
+struct device * bus_find_device(struct bus_type *bus,
+ struct device *start, void *data,
+ int (*match)(struct device *, void *))
+{
+ struct klist_iter i;
+ struct device *dev;
+
+ if (!bus)
+ return NULL;
+
+ klist_iter_init_node(&bus->klist_devices, &i,
+ (start ? &start->knode_bus : NULL));
+ while ((dev = next_device(&i)))
+ if (match(dev, data) && get_device(dev))
+ break;
+ klist_iter_exit(&i);
+ return dev;
+}
static struct device_driver * next_driver(struct klist_iter * i)
if (bus) {
pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
device_attach(dev);
- klist_add_tail(&bus->klist_devices, &dev->knode_bus);
+ klist_add_tail(&dev->knode_bus, &bus->klist_devices);
error = device_add_attrs(bus, dev);
if (!error) {
sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
}
driver_attach(drv);
- klist_add_tail(&bus->klist_drivers, &drv->knode_bus);
+ klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
module_add_driver(drv->owner, drv);
driver_add_attrs(bus, drv);
+ driver_create_file(drv, &driver_attr_unbind);
+ driver_create_file(drv, &driver_attr_bind);
}
return error;
}
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);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
/* Helper for bus_rescan_devices's iter */
static int bus_rescan_devices_helper(struct device *dev, void *data)
{
- int *count = data;
-
- if (!dev->driver && (device_attach(dev) > 0))
- (*count)++;
-
+ if (!dev->driver)
+ device_attach(dev);
return 0;
}
-
/**
- * bus_rescan_devices - rescan devices on the bus for possible drivers
- * @bus: the bus to scan.
+ * bus_rescan_devices - rescan devices on the bus for possible drivers
+ * @bus: the bus to scan.
*
- * This function will look for devices on the bus with no driver
- * attached and rescan it against existing drivers to see if it
- * matches any. Calls device_attach(). Returns the number of devices
- * that were sucessfully bound to a driver.
+ * This function will look for devices on the bus with no driver
+ * attached and rescan it against existing drivers to see if it matches
+ * any by calling device_attach() for the unbound devices.
*/
-int bus_rescan_devices(struct bus_type * bus)
+void bus_rescan_devices(struct bus_type * bus)
{
- int count = 0;
-
- bus_for_each_dev(bus, NULL, &count, bus_rescan_devices_helper);
-
- return count;
+ bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper);
}
}
}
+static void klist_devices_get(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_bus);
+
+ get_device(dev);
+}
+
+static void klist_devices_put(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_bus);
+
+ put_device(dev);
+}
+
+static void klist_drivers_get(struct klist_node *n)
+{
+ struct device_driver *drv = container_of(n, struct device_driver,
+ knode_bus);
+
+ get_driver(drv);
+}
+
+static void klist_drivers_put(struct klist_node *n)
+{
+ struct device_driver *drv = container_of(n, struct device_driver,
+ knode_bus);
+
+ put_driver(drv);
+}
+
/**
* bus_register - register a bus with the system.
* @bus: bus.
if (retval)
goto bus_drivers_fail;
- klist_init(&bus->klist_devices);
- klist_init(&bus->klist_drivers);
+ klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put);
+ klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put);
bus_add_attrs(bus);
pr_debug("bus type '%s' registered\n", bus->name);
EXPORT_SYMBOL_GPL(bus_for_each_dev);
+EXPORT_SYMBOL_GPL(bus_find_device);
EXPORT_SYMBOL_GPL(bus_for_each_drv);
EXPORT_SYMBOL_GPL(bus_add_device);
projects / linux-2.6-omap-h63xx.git / blobdiff