V4L/DVB: cx18: rework cx18-alsa module loading to support automatic loading

Restructure the way the module gets loaded so that it gets loaded automatically
when cx18 is loaded, and make it work properly if there are multiple cards
present (since the old code would only take one opportunity to connect to cx18
instances when the module first loaded).

This work was sponsored by ONELAN Limited.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 22634cf6a96a..23ad6d548dc5 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -637,6 +637,9 @@ struct cx18 {
         u32 active_input;
         v4l2_std_id std;
         v4l2_std_id tuner_std;  /* The norm of the tuner (fixed) */
+
+        /* Used for cx18-alsa module loading */
+        struct work_struct request_module_wk;
 };
 
 static inline struct cx18 *to_cx18(struct v4l2_device *v4l2_dev)
@@ -644,6 +647,9 @@ static inline struct cx18 *to_cx18(struct v4l2_device *v4l2_dev)
         return container_of(v4l2_dev, struct cx18, v4l2_dev);
 }
 
+/* cx18 extensions to be loaded */
+extern int (*cx18_ext_init)(struct cx18 *);
+
 /* Globals */
 extern int cx18_first_minor;