[PATCH v3 04/33] v4l: VIDIOC_SUBDEV_S_SELECTION and VIDIOC_SUBDEV_G_SELECTION IOCTLs

Sakari Ailus
2012-02-20T01:57:56Z

Add support for VIDIOC_SUBDEV_S_SELECTION and VIDIOC_SUBDEV_G_SELECTION
IOCTLs. They replace functionality provided by VIDIOC_SUBDEV_S_CROP and
VIDIOC_SUBDEV_G_CROP IOCTLs and also add new functionality (composing).

VIDIOC_SUBDEV_G_CROP and VIDIOC_SUBDEV_S_CROP continue to be supported.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
---
drivers/media/video/v4l2-subdev.c | 34 +++++++++++++++++++++---------
include/linux/v4l2-subdev.h | 41 +++++++++++++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 21 +++++++++++++++---
3 files changed, 82 insertions(+), 14 deletions(-)

diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 6fe88e9..30c7fd9 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -35,14 +35,9 @@
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
- /* Allocate try format and crop in the same memory block */
- fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
- * sd->entity.num_pads, GFP_KERNEL);
- if (fh->try_fmt == NULL)
+ fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
+ if (fh->pad == NULL)
return -ENOMEM;
-
- fh->try_crop = (struct v4l2_rect *)
- (fh->try_fmt + sd->entity.num_pads);
#endif
return 0;
}
@@ -50,9 +45,8 @@ static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
- kfree(fh->try_fmt);
- fh->try_fmt = NULL;
- fh->try_crop = NULL;
+ kfree(fh->pad);
+ fh->pad = NULL;
#endif
}

@@ -293,6 +287,26 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
fie);
}
+
+ case VIDIOC_SUBDEV_G_SELECTION: {
+ struct v4l2_subdev_selection *sel = arg;
+
+ if (sel->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(
+ sd, pad, get_selection, subdev_fh, sel);
+ }
+
+ case VIDIOC_SUBDEV_S_SELECTION: {
+ struct v4l2_subdev_selection *sel = arg;
+
+ if (sel->pad >= sd->entity.num_pads)
+ return -EINVAL;
+
+ return v4l2_subdev_call(
+ sd, pad, set_selection, subdev_fh, sel);
+ }
#endif
default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
diff --git a/include/linux/v4l2-subdev.h b/include/linux/v4l2-subdev.h
index ed29cbb..6c84390 100644
--- a/include/linux/v4l2-subdev.h
+++ b/include/linux/v4l2-subdev.h
@@ -123,6 +123,43 @@ struct v4l2_subdev_frame_interval_enum {
__u32 reserved[9];
};

+#define V4L2_SUBDEV_SEL_FLAG_SIZE_GE (1 << 0)
+#define V4L2_SUBDEV_SEL_FLAG_SIZE_LE (1 << 1)
+#define V4L2_SUBDEV_SEL_FLAG_KEEP_CONFIG (1 << 2)
+
+/* active cropping area */
+#define V4L2_SUBDEV_SEL_TGT_CROP_ACTIVE 0x0000
+/* cropping bounds */
+#define V4L2_SUBDEV_SEL_TGT_CROP_BOUNDS 0x0002
+/* current composing area */
+#define V4L2_SUBDEV_SEL_TGT_COMPOSE_ACTIVE 0x0100
+/* composing bounds */
+#define V4L2_SUBDEV_SEL_TGT_COMPOSE_BOUNDS 0x0102
+
+
+/**
+ * struct v4l2_subdev_selection - selection info
+ *
+ * @which: either V4L2_SUBDEV_FORMAT_ACTIVE or V4L2_SUBDEV_FORMAT_TRY
+ * @pad: pad number, as reported by the media API
+ * @target: selection target, used to choose one of possible rectangles
+ * @flags: constraint flags
+ * @r: coordinates of the selection window
+ * @reserved: for future use, rounds structure size to 64 bytes, set to zero
+ *
+ * Hardware may use multiple helper windows to process a video stream.
+ * The structure is used to exchange this selection areas between
+ * an application and a driver.
+ */
+struct v4l2_subdev_selection {
+ __u32 which;
+ __u32 pad;
+ __u32 target;
+ __u32 flags;
+ struct v4l2_rect r;
+ __u32 reserved[8];
+};
+
#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 \
@@ -137,5 +174,9 @@ struct v4l2_subdev_frame_interval_enum {
_IOWR('V', 75, struct v4l2_subdev_frame_interval_enum)
#define VIDIOC_SUBDEV_G_CROP _IOWR('V', 59, struct v4l2_subdev_crop)
#define VIDIOC_SUBDEV_S_CROP _IOWR('V', 60, struct v4l2_subdev_crop)
+#define VIDIOC_SUBDEV_G_SELECTION \
+ _IOWR('V', 61, struct v4l2_subdev_selection)
+#define VIDIOC_SUBDEV_S_SELECTION \
+ _IOWR('V', 62, struct v4l2_subdev_selection)

#endif
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index f0f3358..feab950 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -466,6 +466,10 @@ struct v4l2_subdev_pad_ops {
struct v4l2_subdev_crop *crop);
int (*get_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_crop *crop);
+ int (*get_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_selection *sel);
+ int (*set_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_selection *sel);
};

struct v4l2_subdev_ops {
@@ -549,8 +553,11 @@ struct v4l2_subdev {
struct v4l2_subdev_fh {
struct v4l2_fh vfh;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
- struct v4l2_mbus_framefmt *try_fmt;
- struct v4l2_rect *try_crop;
+ struct {
+ struct v4l2_mbus_framefmt try_fmt;
+ struct v4l2_rect try_crop;
+ struct v4l2_rect try_compose;
+ } *pad;
#endif
};

@@ -561,13 +568,19 @@ struct v4l2_subdev_fh {
static inline struct v4l2_mbus_framefmt *
v4l2_subdev_get_try_format(struct v4l2_subdev_fh *fh, unsigned int pad)
{
- return &fh->try_fmt[pad];
+ return &fh->pad[pad].try_fmt;
}

static inline struct v4l2_rect *
v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
{
- return &fh->try_crop[pad];
+ return &fh->pad[pad].try_crop;
+}
+
+static inline struct v4l2_rect *
+v4l2_subdev_get_try_compose(struct v4l2_subdev_fh *fh, unsigned int pad)
+{
+ return &fh->pad[pad].try_compose;
}
#endif

--
1.7.2.5