aboutsummaryrefslogtreecommitdiff
path: root/include/linux/parport.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/parport.h')
-rw-r--r--include/linux/parport.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/parport.h b/include/linux/parport.h
index 1fb508c19e83..f981f794c850 100644
--- a/include/linux/parport.h
+++ b/include/linux/parport.h
@@ -297,6 +297,37 @@ int __must_check __parport_register_driver(struct parport_driver *,
* parport_register_driver must be a macro so that KBUILD_MODNAME can
* be expanded
*/
+
+/**
+ * parport_register_driver - register a parallel port device driver
+ * @driver: structure describing the driver
+ *
+ * This can be called by a parallel port device driver in order
+ * to receive notifications about ports being found in the
+ * system, as well as ports no longer available.
+ *
+ * If devmodel is true then the new device model is used
+ * for registration.
+ *
+ * The @driver structure is allocated by the caller and must not be
+ * deallocated until after calling parport_unregister_driver().
+ *
+ * If using the non device model:
+ * The driver's attach() function may block. The port that
+ * attach() is given will be valid for the duration of the
+ * callback, but if the driver wants to take a copy of the
+ * pointer it must call parport_get_port() to do so. Calling
+ * parport_register_device() on that port will do this for you.
+ *
+ * The driver's detach() function may block. The port that
+ * detach() is given will be valid for the duration of the
+ * callback, but if the driver wants to take a copy of the
+ * pointer it must call parport_get_port() to do so.
+ *
+ *
+ * Returns 0 on success. The non device model will always succeeds.
+ * but the new device model can fail and will return the error code.
+ **/
#define parport_register_driver(driver) \
__parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)