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[media] V4L: Add mem2mem ioctl and file operation helpers

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This patch adds ioctl helpers to the V4L2 mem-to-mem API, so we can avoid
several ioctl handlers in the mem-to-mem video node drivers that are simply
a pass-through to the v4l2_m2m_* calls. These helpers will only be useful
for drivers that use same mutex for both OUTPUT and CAPTURE queue, which
is the case for all currently in tree v4l2 m2m drivers. In order to use
the helpers the drivers are required to use struct v4l2_fh.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki
2013-09-14 18:39:04 -03:00
committed by Mauro Carvalho Chehab
parent 2e1ab9cb94
commit 8e6e8f93f7
3 changed files with 154 additions and 0 deletions
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4
include/media/v4l2-fh.h
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@@ -45,6 +45,10 @@ struct v4l2_fh {
struct list_head available; /* Dequeueable event */
unsigned int navailable;
u32 sequence;
#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
struct v4l2_m2m_ctx *m2m_ctx;
#endif
};
/*