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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2022-07-11 13:21:09 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-08-19 14:47:54 +0300 |
| commit | 0975274557d15ab9a01c0944f27065e6708a797c (patch) | |
| tree | 7be7cd0f3294b5b4d71721bcf779ca9478359717 /drivers/media/v4l2-core | |
| parent | 7392d87a9febb5f46f28d4704eb5636c5e22cdeb (diff) | |
| download | linux-0975274557d15ab9a01c0944f27065e6708a797c.tar.xz | |
media: v4l2-ctrls: add v4l2_ctrl_modify_dimensions
Add a new function to modify the dimensions of an array control.
This is typically used if the array size depends on e.g. the currently
selected video format.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ctrls-api.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-api.c b/drivers/media/v4l2-core/v4l2-ctrls-api.c index 6f1b72c59e8e..878da8592106 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls-api.c +++ b/drivers/media/v4l2-core/v4l2-ctrls-api.c @@ -989,6 +989,42 @@ int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, } EXPORT_SYMBOL(__v4l2_ctrl_modify_range); +int __v4l2_ctrl_modify_dimensions(struct v4l2_ctrl *ctrl, + u32 dims[V4L2_CTRL_MAX_DIMS]) +{ + unsigned int elems = 1; + unsigned int i; + void *p_array; + + lockdep_assert_held(ctrl->handler->lock); + + if (!ctrl->is_array || ctrl->is_dyn_array) + return -EINVAL; + + for (i = 0; i < ctrl->nr_of_dims; i++) + elems *= dims[i]; + if (elems == 0) + return -EINVAL; + p_array = kvzalloc(2 * elems * ctrl->elem_size, GFP_KERNEL); + if (!p_array) + return -ENOMEM; + kvfree(ctrl->p_array); + ctrl->p_array_alloc_elems = elems; + ctrl->elems = elems; + ctrl->new_elems = elems; + ctrl->p_array = p_array; + ctrl->p_new.p = p_array; + ctrl->p_cur.p = p_array + elems * ctrl->elem_size; + for (i = 0; i < ctrl->nr_of_dims; i++) + ctrl->dims[i] = dims[i]; + for (i = 0; i < elems; i++) + ctrl->type_ops->init(ctrl, i, ctrl->p_cur); + cur_to_new(ctrl); + send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_VALUE); + return 0; +} +EXPORT_SYMBOL(__v4l2_ctrl_modify_dimensions); + /* Implement VIDIOC_QUERY_EXT_CTRL */ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc) { |