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[media] v4l: Create v4l2 subdev file handle structure

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Used for storing subdev information per file handle and hold V4L2 file
handle.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: Antti Koskipaa <akoskipa@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Stanimir Varbanov 2010-05-21 06:04:24 -03:00 committed by Mauro Carvalho Chehab
parent dacdde78b3
commit 7cd5a16b22
3 changed files with 102 additions and 33 deletions
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9
drivers/media/Kconfig
View File

@ -53,6 +53,15 @@ config VIDEO_V4L2_COMMON
depends on (I2C || I2C=n) && VIDEO_DEV
default (I2C || I2C=n) && VIDEO_DEV
config VIDEO_V4L2_SUBDEV_API
bool "V4L2 sub-device userspace API (EXPERIMENTAL)"
depends on VIDEO_DEV && MEDIA_CONTROLLER && EXPERIMENTAL
---help---
Enables the V4L2 sub-device pad-level userspace API used to configure
video format, size and frame rate between hardware blocks.
This API is mostly used by camera interfaces in embedded platforms.
#
# DVB Core
#

97
drivers/media/video/v4l2-subdev.c
View File

@ -31,36 +31,66 @@
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
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)
return -ENOMEM;
fh->try_crop = (struct v4l2_rect *)
(fh->try_fmt + sd->entity.num_pads);
#endif
return 0;
}
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;
#endif
}
static int subdev_open(struct file *file)
{
struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
struct v4l2_subdev_fh *subdev_fh;
#if defined(CONFIG_MEDIA_CONTROLLER)
struct media_entity *entity;
#endif
struct v4l2_fh *vfh = NULL;
int ret;
if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
if (vfh == NULL)
return -ENOMEM;
subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
if (subdev_fh == NULL)
return -ENOMEM;
ret = v4l2_fh_init(vfh, vdev);
if (ret)
goto err;
ret = v4l2_event_init(vfh);
if (ret)
goto err;
ret = v4l2_event_alloc(vfh, sd->nevents);
if (ret)
goto err;
v4l2_fh_add(vfh);
file->private_data = vfh;
ret = subdev_fh_init(subdev_fh, sd);
if (ret) {
kfree(subdev_fh);
return ret;
}
ret = v4l2_fh_init(&subdev_fh->vfh, vdev);
if (ret)
goto err;
if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
ret = v4l2_event_init(&subdev_fh->vfh);
if (ret)
goto err;
ret = v4l2_event_alloc(&subdev_fh->vfh, sd->nevents);
if (ret)
goto err;
}
v4l2_fh_add(&subdev_fh->vfh);
file->private_data = &subdev_fh->vfh;
#if defined(CONFIG_MEDIA_CONTROLLER)
if (sd->v4l2_dev->mdev) {
entity = media_entity_get(&sd->entity);
@ -70,14 +100,14 @@ static int subdev_open(struct file *file)
}
}
#endif
return 0;
err:
if (vfh != NULL) {
v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
kfree(vfh);
}
v4l2_fh_del(&subdev_fh->vfh);
v4l2_fh_exit(&subdev_fh->vfh);
subdev_fh_free(subdev_fh);
kfree(subdev_fh);
return ret;
}
@ -89,16 +119,17 @@ static int subdev_close(struct file *file)
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
#endif
struct v4l2_fh *vfh = file->private_data;
struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
#if defined(CONFIG_MEDIA_CONTROLLER)
if (sd->v4l2_dev->mdev)
media_entity_put(&sd->entity);
#endif
if (vfh != NULL) {
v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
kfree(vfh);
}
v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
subdev_fh_free(subdev_fh);
kfree(subdev_fh);
file->private_data = NULL;
return 0;
}
@ -107,7 +138,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
struct v4l2_fh *fh = file->private_data;
struct v4l2_fh *vfh = file->private_data;
switch (cmd) {
case VIDIOC_QUERYCTRL:
@ -135,13 +166,13 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
return -ENOIOCTLCMD;
return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
case VIDIOC_SUBSCRIBE_EVENT:
return v4l2_subdev_call(sd, core, subscribe_event, fh, arg);
return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
case VIDIOC_UNSUBSCRIBE_EVENT:
return v4l2_subdev_call(sd, core, unsubscribe_event, fh, arg);
return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
default:
return -ENOIOCTLCMD;

29
include/media/v4l2-subdev.h
View File

@ -24,6 +24,7 @@
#include <media/media-entity.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-mediabus.h>
/* generic v4l2_device notify callback notification values */
@ -481,6 +482,34 @@ struct v4l2_subdev {
#define vdev_to_v4l2_subdev(vdev) \
container_of(vdev, struct v4l2_subdev, devnode)
/*
* Used for storing subdev information per file handle
*/
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;
#endif
};
#define to_v4l2_subdev_fh(fh) \
container_of(fh, struct v4l2_subdev_fh, vfh)
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static inline struct v4l2_mbus_framefmt *
v4l2_subdev_get_try_format(struct v4l2_subdev_fh *fh, unsigned int pad)
{
return &fh->try_fmt[pad];
}
static inline struct v4l2_rect *
v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
{
return &fh->try_crop[pad];
}
#endif
extern const struct v4l2_file_operations v4l2_subdev_fops;
static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)