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authorMauro Carvalho Chehab <mchehab@osg.samsung.com>2016-03-05 07:13:39 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2016-03-10 15:10:59 -0300
commitb2cd27448b33de9069d580d8f229efef434b64e6 (patch)
tree9464dd1d85ef2fb0bcb958d7043fc4ec0d593029 /include/uapi
parentfbe093ac9f0201939279cdfe8b0fce20ce5ef7a9 (diff)
[media] media-device: map new functions into old types for legacy API
The legacy media controller userspace API exposes entity types that carry both type and function information. The new API replaces the type with a function. It preserves backward compatibility by defining legacy functions for the existing types and using them in drivers. This works fine, as long as newer entity functions won't be added. Unfortunately, some tools, like media-ctl with --print-dot argument rely on the now legacy MEDIA_ENT_T_V4L2_SUBDEV and MEDIA_ENT_T_DEVNODE numeric ranges to identify what entities will be shown. Also, if the entity doesn't match those ranges, it will ignore the major/minor information on devnodes, and won't be getting the devnode name via udev or sysfs. As we're now adding devices outside the old range, the legacy ioctl needs to map the new entity functions into a type at the old range, or otherwise we'll have a regression. Detected on all released media-ctl versions (e. g. versions <= 1.10). Fix this by deriving the type from the function to emulate the legacy API if the function isn't in the legacy functions range. Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/media.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index 625b38f65764..a8e3a8c0d85a 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -120,7 +120,7 @@ struct media_device_info {
#define MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN MEDIA_ENT_F_OLD_SUBDEV_BASE
-#ifndef __KERNEL__
+#if !defined(__KERNEL__) || defined(__NEED_MEDIA_LEGACY_API)
/*
* Legacy symbols used to avoid userspace compilation breakages
@@ -133,6 +133,10 @@ struct media_device_info {
#define MEDIA_ENT_TYPE_MASK 0x00ff0000
#define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff
+/* End of the old subdev reserved numberspace */
+#define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_T_DEVNODE | \
+ MEDIA_ENT_SUBTYPE_MASK)
+
#define MEDIA_ENT_T_DEVNODE MEDIA_ENT_F_OLD_BASE
#define MEDIA_ENT_T_DEVNODE_V4L MEDIA_ENT_F_IO_V4L
#define MEDIA_ENT_T_DEVNODE_FB (MEDIA_ENT_T_DEVNODE + 2)