[PATCH 4/5] v4l: controls: QUERY_EXT_CTRL support for base, prefix and unit

[Sakari Ailus]

Add support for conveying the information set by the driver to the user
space.

Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 3 +++
 include/media/v4l2-ctrls.h           | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c 
b/drivers/media/v4l2-core/v4l2-ctrls.c
index ee006d34c19f0..8d2931b0a4701 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2732,6 +2732,9 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, 
struct v4l2_query_ext_ctr
        qc->minimum = ctrl->minimum;
        qc->maximum = ctrl->maximum;
        qc->default_value = ctrl->default_value;
+       qc->base = ctrl->base;
+       qc->prefix = ctrl->prefix;
+       qc->unit = ctrl->unit;
        if (ctrl->type == V4L2_CTRL_TYPE_MENU
            || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
                qc->step = 1;
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index f615ba1b29dd9..d6aaf45b70381 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -220,6 +220,8 @@ struct v4l2_ctrl {
        u32 elem_size;
        u32 dims[V4L2_CTRL_MAX_DIMS];
        u32 nr_of_dims;
+       u8 base, unit;
+       u16 prefix;
        union {
                u64 step;
                u64 menu_skip_mask;
-- 
2.11.0