[media] v4l: v4l2_subdev userspace frame interval API

The three new ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL,
VIDIOC_SUBDEV_G_FRAME_INTERVAL and VIDIOC_SUBDEV_S_FRAME_INTERVAL can be
used to enumerate and configure a subdev's frame rate from userspace.

Two new video::g/s_frame_interval subdev operations are introduced to
support those ioctls. The existing video::g/s_parm operations are
deprecated and shouldn't be used anymore.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/include/linux/v4l2-subdev.h b/include/linux/v4l2-subdev.h
index 8dbb44873821..c55f9e9e1dd3 100644
--- a/include/linux/v4l2-subdev.h
+++ b/include/linux/v4l2-subdev.h
@@ -80,11 +80,47 @@ struct v4l2_subdev_frame_size_enum {
         __u32 reserved[9];
 };
 
+/**
+ * struct v4l2_subdev_frame_interval - Pad-level frame rate
+ * @pad: pad number, as reported by the media API
+ * @interval: frame interval in seconds
+ */
+struct v4l2_subdev_frame_interval {
+        __u32 pad;
+        struct v4l2_fract interval;
+        __u32 reserved[9];
+};
+
+/**
+ * struct v4l2_subdev_frame_interval_enum - Frame interval enumeration
+ * @pad: pad number, as reported by the media API
+ * @index: frame interval index during enumeration
+ * @code: format code (from enum v4l2_mbus_pixelcode)
+ * @width: frame width in pixels
+ * @height: frame height in pixels
+ * @interval: frame interval in seconds
+ */
+struct v4l2_subdev_frame_interval_enum {
+        __u32 index;
+        __u32 pad;
+        __u32 code;
+        __u32 width;
+        __u32 height;
+        struct v4l2_fract interval;
+        __u32 reserved[9];
+};
+
 #define VIDIOC_SUBDEV_G_FMT     _IOWR('V',  4, struct v4l2_subdev_format)
 #define VIDIOC_SUBDEV_S_FMT     _IOWR('V',  5, struct v4l2_subdev_format)
+#define VIDIOC_SUBDEV_G_FRAME_INTERVAL \
+                        _IOWR('V', 21, struct v4l2_subdev_frame_interval)
+#define VIDIOC_SUBDEV_S_FRAME_INTERVAL \
+                        _IOWR('V', 22, struct v4l2_subdev_frame_interval)
 #define VIDIOC_SUBDEV_ENUM_MBUS_CODE \
                         _IOWR('V',  2, struct v4l2_subdev_mbus_code_enum)
 #define VIDIOC_SUBDEV_ENUM_FRAME_SIZE \
                         _IOWR('V', 74, struct v4l2_subdev_frame_size_enum)
+#define VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL \
+                        _IOWR('V', 75, struct v4l2_subdev_frame_interval_enum)
 
 #endif
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 4215650151be..8b7a78a013c6 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -268,6 +268,10 @@ struct v4l2_subdev_video_ops {
         int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
+        int (*g_frame_interval)(struct v4l2_subdev *sd,
+                                struct v4l2_subdev_frame_interval *interval);
+        int (*s_frame_interval)(struct v4l2_subdev *sd,
+                                struct v4l2_subdev_frame_interval *interval);
         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
         int (*enum_dv_presets) (struct v4l2_subdev *sd,
@@ -420,6 +424,9 @@ struct v4l2_subdev_pad_ops {
         int (*enum_frame_size)(struct v4l2_subdev *sd,
                                struct v4l2_subdev_fh *fh,
                                struct v4l2_subdev_frame_size_enum *fse);
+        int (*enum_frame_interval)(struct v4l2_subdev *sd,
+                                   struct v4l2_subdev_fh *fh,
+                                   struct v4l2_subdev_frame_interval_enum *fie);
         int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                        struct v4l2_subdev_format *format);
         int (*set_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,