[media] v4l: add support for selection api

This patch introduces new api for a precise control of cropping and composing
features for video devices. The new ioctls are VIDIOC_S_SELECTION and
VIDIOC_G_SELECTION.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index b2e1331ca76b..012a29604522 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -743,6 +743,48 @@ struct v4l2_crop {
         struct v4l2_rect        c;
 };
 
+/* Hints for adjustments of selection rectangle */
+#define V4L2_SEL_FLAG_GE        0x00000001
+#define V4L2_SEL_FLAG_LE        0x00000002
+
+/* Selection targets */
+
+/* current cropping area */
+#define V4L2_SEL_TGT_CROP_ACTIVE        0
+/* default cropping area */
+#define V4L2_SEL_TGT_CROP_DEFAULT       1
+/* cropping bounds */
+#define V4L2_SEL_TGT_CROP_BOUNDS        2
+/* current composing area */
+#define V4L2_SEL_TGT_COMPOSE_ACTIVE     256
+/* default composing area */
+#define V4L2_SEL_TGT_COMPOSE_DEFAULT    257
+/* composing bounds */
+#define V4L2_SEL_TGT_COMPOSE_BOUNDS     258
+/* current composing area plus all padding pixels */
+#define V4L2_SEL_TGT_COMPOSE_PADDED     259
+
+/**
+ * struct v4l2_selection - selection info
+ * @type:       buffer type (do not use *_MPLANE types)
+ * @target:     selection target, used to choose one of possible rectangles
+ * @flags:      constraints flags
+ * @r:          coordinates of selection window
+ * @reserved:   for future use, rounds structure size to 64 bytes, set to zero
+ *
+ * Hardware may use multiple helper window to process a video stream.
+ * The structure is used to exchange this selection areas between
+ * an application and a driver.
+ */
+struct v4l2_selection {
+        __u32                   type;
+        __u32                   target;
+        __u32                   flags;
+        struct v4l2_rect        r;
+        __u32                   reserved[9];
+};
+
+
 /*
  *      A N A L O G   V I D E O   S T A N D A R D
  */
@@ -2259,6 +2301,10 @@ struct v4l2_create_buffers {
 #define VIDIOC_CREATE_BUFS      _IOWR('V', 92, struct v4l2_create_buffers)
 #define VIDIOC_PREPARE_BUF      _IOWR('V', 93, struct v4l2_buffer)
 
+/* Experimental selection API */
+#define VIDIOC_G_SELECTION      _IOWR('V', 94, struct v4l2_selection)
+#define VIDIOC_S_SELECTION      _IOWR('V', 95, struct v4l2_selection)
+
 /* Reminder: when adding new ioctls please add support for them to
    drivers/media/video/v4l2-compat-ioctl32.c as well! */
 
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index 4d1c74ad4c84..3f5d60fc5df6 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -196,6 +196,10 @@ struct v4l2_ioctl_ops {
                                         struct v4l2_crop *a);
         int (*vidioc_s_crop)           (struct file *file, void *fh,
                                         struct v4l2_crop *a);
+        int (*vidioc_g_selection)      (struct file *file, void *fh,
+                                        struct v4l2_selection *s);
+        int (*vidioc_s_selection)      (struct file *file, void *fh,
+                                        struct v4l2_selection *s);
         /* Compression ioctls */
         int (*vidioc_g_jpegcomp)       (struct file *file, void *fh,
                                         struct v4l2_jpegcompression *a);