*
* Copyright (c) 2002-3 Patrick Mochel
* Copyright (c) 2002-3 Open Source Development Labs
+ * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2007 Novell Inc.
*
* This file is released under the GPLv2
*
#include <linux/device.h>
#include <linux/module.h>
#include <linux/errno.h>
+#include <linux/slab.h>
#include <linux/string.h>
#include "base.h"
-#define to_dev(node) container_of(node, struct device, driver_list)
-#define to_drv(obj) container_of(obj, struct device_driver, kobj)
-
-
-static struct device * next_device(struct klist_iter * i)
+static struct device *next_device(struct klist_iter *i)
{
- struct klist_node * n = klist_next(i);
- return n ? container_of(n, struct device, knode_driver) : NULL;
+ struct klist_node *n = klist_next(i);
+ struct device *dev = NULL;
+ struct device_private *dev_prv;
+
+ if (n) {
+ dev_prv = to_device_private_driver(n);
+ dev = dev_prv->device;
+ }
+ return dev;
}
/**
- * driver_for_each_device - Iterator for devices bound to a driver.
- * @drv: Driver we're iterating.
- * @start: Device to begin with
- * @data: Data to pass to the callback.
- * @fn: Function to call for each device.
+ * driver_for_each_device - Iterator for devices bound to a driver.
+ * @drv: Driver we're iterating.
+ * @start: Device to begin with
+ * @data: Data to pass to the callback.
+ * @fn: Function to call for each device.
*
- * Iterate over the @drv's list of devices calling @fn for each one.
+ * Iterate over the @drv's list of devices calling @fn for each one.
*/
-
-int driver_for_each_device(struct device_driver * drv, struct device * start,
- void * data, int (*fn)(struct device *, void *))
+int driver_for_each_device(struct device_driver *drv, struct device *start,
+ void *data, int (*fn)(struct device *, void *))
{
struct klist_iter i;
- struct device * dev;
+ struct device *dev;
int error = 0;
if (!drv)
return -EINVAL;
- klist_iter_init_node(&drv->klist_devices, &i,
- start ? &start->knode_driver : NULL);
+ klist_iter_init_node(&drv->p->klist_devices, &i,
+ start ? &start->p->knode_driver : NULL);
while ((dev = next_device(&i)) && !error)
error = fn(dev, data);
klist_iter_exit(&i);
return error;
}
-
EXPORT_SYMBOL_GPL(driver_for_each_device);
-
/**
* driver_find_device - device iterator for locating a particular device.
* @drv: The device's driver
* 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 * driver_find_device(struct device_driver *drv,
- struct device * start, void * data,
- int (*match)(struct device *, void *))
+struct device *driver_find_device(struct device_driver *drv,
+ struct device *start, void *data,
+ int (*match)(struct device *dev, void *data))
{
struct klist_iter i;
struct device *dev;
if (!drv)
return NULL;
- klist_iter_init_node(&drv->klist_devices, &i,
- (start ? &start->knode_driver : NULL));
+ klist_iter_init_node(&drv->p->klist_devices, &i,
+ (start ? &start->p->knode_driver : NULL));
while ((dev = next_device(&i)))
if (match(dev, data) && get_device(dev))
break;
EXPORT_SYMBOL_GPL(driver_find_device);
/**
- * driver_create_file - create sysfs file for driver.
- * @drv: driver.
- * @attr: driver attribute descriptor.
+ * driver_create_file - create sysfs file for driver.
+ * @drv: driver.
+ * @attr: driver attribute descriptor.
*/
-
-int driver_create_file(struct device_driver * drv, struct driver_attribute * attr)
+int driver_create_file(struct device_driver *drv,
+ const struct driver_attribute *attr)
{
int error;
- if (get_driver(drv)) {
- error = sysfs_create_file(&drv->kobj, &attr->attr);
- put_driver(drv);
- } else
+ if (drv)
+ error = sysfs_create_file(&drv->p->kobj, &attr->attr);
+ else
error = -EINVAL;
return error;
}
+EXPORT_SYMBOL_GPL(driver_create_file);
+/**
+ * driver_remove_file - remove sysfs file for driver.
+ * @drv: driver.
+ * @attr: driver attribute descriptor.
+ */
+void driver_remove_file(struct device_driver *drv,
+ const struct driver_attribute *attr)
+{
+ if (drv)
+ sysfs_remove_file(&drv->p->kobj, &attr->attr);
+}
+EXPORT_SYMBOL_GPL(driver_remove_file);
/**
- * driver_remove_file - remove sysfs file for driver.
- * @drv: driver.
- * @attr: driver attribute descriptor.
+ * driver_add_kobj - add a kobject below the specified driver
+ * @drv: requesting device driver
+ * @kobj: kobject to add below this driver
+ * @fmt: format string that names the kobject
+ *
+ * You really don't want to do this, this is only here due to one looney
+ * iseries driver, go poke those developers if you are annoyed about
+ * this...
*/
+int driver_add_kobj(struct device_driver *drv, struct kobject *kobj,
+ const char *fmt, ...)
+{
+ va_list args;
+ char *name;
+ int ret;
+
+ va_start(args, fmt);
+ name = kvasprintf(GFP_KERNEL, fmt, args);
+ va_end(args);
+
+ if (!name)
+ return -ENOMEM;
+
+ ret = kobject_add(kobj, &drv->p->kobj, "%s", name);
+ kfree(name);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(driver_add_kobj);
-void driver_remove_file(struct device_driver * drv, struct driver_attribute * attr)
+/**
+ * get_driver - increment driver reference count.
+ * @drv: driver.
+ */
+struct device_driver *get_driver(struct device_driver *drv)
{
- if (get_driver(drv)) {
- sysfs_remove_file(&drv->kobj, &attr->attr);
- put_driver(drv);
+ if (drv) {
+ struct driver_private *priv;
+ struct kobject *kobj;
+
+ kobj = kobject_get(&drv->p->kobj);
+ priv = to_driver(kobj);
+ return priv->driver;
}
+ return NULL;
}
-
+EXPORT_SYMBOL_GPL(get_driver);
/**
- * get_driver - increment driver reference count.
- * @drv: driver.
+ * put_driver - decrement driver's refcount.
+ * @drv: driver.
*/
-struct device_driver * get_driver(struct device_driver * drv)
+void put_driver(struct device_driver *drv)
{
- return drv ? to_drv(kobject_get(&drv->kobj)) : NULL;
+ kobject_put(&drv->p->kobj);
}
+EXPORT_SYMBOL_GPL(put_driver);
+static int driver_add_groups(struct device_driver *drv,
+ const struct attribute_group **groups)
+{
+ int error = 0;
+ int i;
-/**
- * put_driver - decrement driver's refcount.
- * @drv: driver.
- */
-void put_driver(struct device_driver * drv)
+ if (groups) {
+ for (i = 0; groups[i]; i++) {
+ error = sysfs_create_group(&drv->p->kobj, groups[i]);
+ if (error) {
+ while (--i >= 0)
+ sysfs_remove_group(&drv->p->kobj,
+ groups[i]);
+ break;
+ }
+ }
+ }
+ return error;
+}
+
+static void driver_remove_groups(struct device_driver *drv,
+ const struct attribute_group **groups)
{
- kobject_put(&drv->kobj);
+ int i;
+
+ if (groups)
+ for (i = 0; groups[i]; i++)
+ sysfs_remove_group(&drv->p->kobj, groups[i]);
}
/**
- * driver_register - register driver with bus
- * @drv: driver to register
+ * driver_register - register driver with bus
+ * @drv: driver to register
*
- * We pass off most of the work to the bus_add_driver() call,
- * since most of the things we have to do deal with the bus
- * structures.
+ * We pass off most of the work to the bus_add_driver() call,
+ * since most of the things we have to do deal with the bus
+ * structures.
*/
-int driver_register(struct device_driver * drv)
+int driver_register(struct device_driver *drv)
{
+ int ret;
+ struct device_driver *other;
+
+ BUG_ON(!drv->bus->p);
+
if ((drv->bus->probe && drv->probe) ||
(drv->bus->remove && drv->remove) ||
- (drv->bus->shutdown && drv->shutdown)) {
- printk(KERN_WARNING "Driver '%s' needs updating - please use bus_type methods\n", drv->name);
+ (drv->bus->shutdown && drv->shutdown))
+ printk(KERN_WARNING "Driver '%s' needs updating - please use "
+ "bus_type methods\n", drv->name);
+
+ other = driver_find(drv->name, drv->bus);
+ if (other) {
+ put_driver(other);
+ printk(KERN_ERR "Error: Driver '%s' is already registered, "
+ "aborting...\n", drv->name);
+ return -EBUSY;
}
- klist_init(&drv->klist_devices, NULL, NULL);
- return bus_add_driver(drv);
+
+ ret = bus_add_driver(drv);
+ if (ret)
+ return ret;
+ ret = driver_add_groups(drv, drv->groups);
+ if (ret)
+ bus_remove_driver(drv);
+ return ret;
}
+EXPORT_SYMBOL_GPL(driver_register);
/**
- * driver_unregister - remove driver from system.
- * @drv: driver.
+ * driver_unregister - remove driver from system.
+ * @drv: driver.
*
- * Again, we pass off most of the work to the bus-level call.
+ * Again, we pass off most of the work to the bus-level call.
*/
-
-void driver_unregister(struct device_driver * drv)
+void driver_unregister(struct device_driver *drv)
{
+ if (!drv || !drv->p) {
+ WARN(1, "Unexpected driver unregister!\n");
+ return;
+ }
+ driver_remove_groups(drv, drv->groups);
bus_remove_driver(drv);
}
+EXPORT_SYMBOL_GPL(driver_unregister);
/**
- * driver_find - locate driver on a bus by its name.
- * @name: name of the driver.
- * @bus: bus to scan for the driver.
+ * driver_find - locate driver on a bus by its name.
+ * @name: name of the driver.
+ * @bus: bus to scan for the driver.
*
- * Call kset_find_obj() to iterate over list of drivers on
- * a bus to find driver by name. Return driver if found.
+ * Call kset_find_obj() to iterate over list of drivers on
+ * a bus to find driver by name. Return driver if found.
*
- * Note that kset_find_obj increments driver's reference count.
+ * Note that kset_find_obj increments driver's reference count.
*/
struct device_driver *driver_find(const char *name, struct bus_type *bus)
{
- struct kobject *k = kset_find_obj(bus->drivers_kset, name);
- if (k)
- return to_drv(k);
+ struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
+ struct driver_private *priv;
+
+ if (k) {
+ priv = to_driver(k);
+ return priv->driver;
+ }
return NULL;
}
-
-EXPORT_SYMBOL_GPL(driver_register);
-EXPORT_SYMBOL_GPL(driver_unregister);
-EXPORT_SYMBOL_GPL(get_driver);
-EXPORT_SYMBOL_GPL(put_driver);
EXPORT_SYMBOL_GPL(driver_find);
-
-EXPORT_SYMBOL_GPL(driver_create_file);
-EXPORT_SYMBOL_GPL(driver_remove_file);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff