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media: subdev: add v4l2_subdev_set_routing helper() 

Add a helper function to set the subdev routing. The helper can be used
from subdev driver's set_routing op to store the routing table.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2021-12-21 11:18:43 +01:00 committed by Mauro Carvalho Chehab
parent 33c0ddbe56
commit 17bb9bf819
2 changed files with 47 additions and 0 deletions
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31
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -12,6 +12,7 @@
#include <linux/ioctl.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/version.h>
@ -1208,6 +1209,36 @@ int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing)
{
struct v4l2_subdev_krouting *dst = &state->routing;
const struct v4l2_subdev_krouting *src = routing;
struct v4l2_subdev_krouting new_routing = { 0 };
size_t bytes;
if (unlikely(check_mul_overflow((size_t)src->num_routes,
sizeof(*src->routes), &bytes)))
return -EOVERFLOW;
lockdep_assert_held(state->lock);
if (src->num_routes > 0) {
new_routing.routes = kmemdup(src->routes, bytes, GFP_KERNEL);
if (!new_routing.routes)
return -ENOMEM;
}
new_routing.num_routes = src->num_routes;
kfree(dst->routes);
*dst = new_routing;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */

16
include/media/v4l2-subdev.h
View File

@ -1424,6 +1424,22 @@ v4l2_subdev_lock_and_get_active_state(struct v4l2_subdev *sd)
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format);
/**
* v4l2_subdev_set_routing() - Set given routing to subdev state
* @sd: The subdevice
* @state: The subdevice state
* @routing: Routing that will be copied to subdev state
*
* This will release old routing table (if any) from the state, allocate
* enough space for the given routing, and copy the routing.
*
* This can be used from the subdev driver's set_routing op, after validating
* the routing.
*/
int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */