A possibility to preallocate and initialise buffers of different sizes
in V4L2 is required for an efficient implementation of asnapshot mode.
This patch adds three new ioctl()s: VIDIOC_CREATE_BUFS,
VIDIOC_DESTROY_BUFS, and VIDIOC_SUBMIT_BUF and defines respective data
structures.
Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
---
drivers/media/video/v4l2-compat-ioctl32.c | 3 ++
drivers/media/video/v4l2-ioctl.c | 43 +++++++++++++++++++++++++++++
include/linux/videodev2.h | 24 ++++++++++++++++
include/media/v4l2-ioctl.h | 3 ++
4 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/v4l2-compat-ioctl32.c
b/drivers/media/video/v4l2-compat-ioctl32.c
index 7c26947..d71b289 100644
--- a/drivers/media/video/v4l2-compat-ioctl32.c
+++ b/drivers/media/video/v4l2-compat-ioctl32.c
@@ -922,6 +922,9 @@ long v4l2_compat_ioctl32(struct file *file, unsigned int
cmd, unsigned long arg)
case VIDIOC_DQEVENT:
case VIDIOC_SUBSCRIBE_EVENT:
case VIDIOC_UNSUBSCRIBE_EVENT:
+ case VIDIOC_CREATE_BUFS:
+ case VIDIOC_DESTROY_BUFS:
+ case VIDIOC_SUBMIT_BUF:
ret = do_video_ioctl(file, cmd, arg);
break;
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index a01ed39..b80a211 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -259,6 +259,9 @@ static const char *v4l2_ioctls[] = {
[_IOC_NR(VIDIOC_DQEVENT)] = "VIDIOC_DQEVENT",
[_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)] = "VIDIOC_SUBSCRIBE_EVENT",
[_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",
+ [_IOC_NR(VIDIOC_CREATE_BUFS)] = "VIDIOC_CREATE_BUFS",
+ [_IOC_NR(VIDIOC_DESTROY_BUFS)] = "VIDIOC_DESTROY_BUFS",
+ [_IOC_NR(VIDIOC_SUBMIT_BUF)] = "VIDIOC_SUBMIT_BUF",
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
@@ -2184,6 +2187,46 @@ static long __video_do_ioctl(struct file *file,
dbgarg(cmd, "type=0x%8.8x", sub->type);
break;
}
+ case VIDIOC_CREATE_BUFS:
+ {
+ struct v4l2_create_buffers *create = arg;
+
+ if (!ops->vidioc_create_bufs)
+ break;
+ ret = check_fmt(ops, create->format.type);
+ if (ret)
+ break;
+
+ if (create->size)
+ CLEAR_AFTER_FIELD(create, count);
+
+ ret = ops->vidioc_create_bufs(file, fh, create);
+
+ dbgarg(cmd, "count=%d\n", create->count);
+ break;
+ }
+ case VIDIOC_DESTROY_BUFS:
+ {
+ struct v4l2_buffer_span *span = arg;
+
+ if (!ops->vidioc_destroy_bufs)
+ break;
+
+ ret = ops->vidioc_destroy_bufs(file, fh, span);
+
+ dbgarg(cmd, "count=%d", span->count);
+ break;
+ }
+ case VIDIOC_SUBMIT_BUF:
+ {
+ unsigned int *i = arg;
+
+ if (!ops->vidioc_submit_buf)
+ break;
+ ret = ops->vidioc_submit_buf(file, fh, *i);
+ dbgarg(cmd, "index=%d", *i);
+ break;
+ }
default:
{
bool valid_prio = true;
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index aa6c393..b6ef46e 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1847,6 +1847,26 @@ struct v4l2_dbg_chip_ident {
__u32 revision; /* chip revision, chip specific */
} __attribute__ ((packed));
+/* VIDIOC_DESTROY_BUFS */
+struct v4l2_buffer_span {
+ __u32 index; /* output: buffers index...index +
count - 1 have been created */
+ __u32 count;
+ __u32 reserved[2];
+};
+
+/* struct v4l2_createbuffers::flags */
+#define V4L2_BUFFER_FLAG_NO_CACHE_INVALIDATE (1 << 0)
+
+/* VIDIOC_CREATE_BUFS */
+struct v4l2_create_buffers {
+ __u32 index; /* output: buffers
index...index + count - 1 have been created */
+ __u32 count;
+ __u32 flags; /* V4L2_BUFFER_FLAG_* */
+ enum v4l2_memory memory;
+ __u32 size; /* Explicit size, e.g., for
compressed streams */
+ struct v4l2_format format; /* "type" is used always, the
rest if size == 0 */
+};
+
/*
* I O C T L C O D E S F O R V I D E O D E V I C E S
*
@@ -1937,6 +1957,10 @@ struct v4l2_dbg_chip_ident {
#define VIDIOC_SUBSCRIBE_EVENT _IOW('V', 90, struct
v4l2_event_subscription)
#define VIDIOC_UNSUBSCRIBE_EVENT _IOW('V', 91, struct
v4l2_event_subscription)
+#define VIDIOC_CREATE_BUFS _IOWR('V', 92, struct v4l2_create_buffers)
+#define VIDIOC_DESTROY_BUFS _IOWR('V', 93, struct v4l2_buffer_span)
+#define VIDIOC_SUBMIT_BUF _IOW('V', 94, int)
+
/* 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 dd9f1e7..00962c6 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -122,6 +122,9 @@ struct v4l2_ioctl_ops {
int (*vidioc_qbuf) (struct file *file, void *fh, struct v4l2_buffer
*b);
int (*vidioc_dqbuf) (struct file *file, void *fh, struct v4l2_buffer
*b);
+ int (*vidioc_create_bufs) (struct file *file, void *fh, struct
v4l2_create_buffers *b);
+ int (*vidioc_destroy_bufs)(struct file *file, void *fh, struct
v4l2_buffer_span *b);
+ int (*vidioc_submit_buf) (struct file *file, void *fh, unsigned int i);
int (*vidioc_overlay) (struct file *file, void *fh, unsigned int i);
int (*vidioc_g_fbuf) (struct file *file, void *fh,
--
1.7.2.5
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