[RESEND][PATCH 4/4] Driver core updates (needed for serio)
From: Dmitry Torokhov (dtor_core_at_ameritech.net)
Date: 07/08/04
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To: Greg KH <greg@kroah.com> Date: Wed, 7 Jul 2004 20:41:32 -0500
===================================================================
ChangeSet@1.1822, 2004-07-07 18:18:04-05:00, dtor_core@ameritech.net
Driver core: add driver_find helper to find a driver by its name
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
drivers/base/driver.c | 19 +++++++++++++++++++
include/linux/device.h | 1 +
2 files changed, 20 insertions(+)
===================================================================
diff -Nru a/drivers/base/driver.c b/drivers/base/driver.c
--- a/drivers/base/driver.c 2004-07-07 19:56:21 -05:00
+++ b/drivers/base/driver.c 2004-07-07 19:56:21 -05:00
@@ -111,10 +111,29 @@
up(&drv->unload_sem);
}
+/**
+ * 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.
+ *
+ * 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, name);
+ if (k)
+ return to_drv(k);
+ return NULL;
+}
+
EXPORT_SYMBOL(driver_register);
EXPORT_SYMBOL(driver_unregister);
EXPORT_SYMBOL(get_driver);
EXPORT_SYMBOL(put_driver);
+EXPORT_SYMBOL(driver_find);
EXPORT_SYMBOL(driver_create_file);
EXPORT_SYMBOL(driver_remove_file);
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h 2004-07-07 19:56:21 -05:00
+++ b/include/linux/device.h 2004-07-07 19:56:21 -05:00
@@ -120,6 +120,7 @@
extern struct device_driver * get_driver(struct device_driver * drv);
extern void put_driver(struct device_driver * drv);
+extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
/* driverfs interface for exporting driver attributes */
-
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