[media] v4l2-subdev: add (un)register internal ops
Some subdevs need to call into the board code after they are registered and have a valid struct v4l2_device pointer. The s_config op was abused for this, but now that it is removed we need a cleaner way of solving this. So this patch adds a struct with internal ops that the v4l2 core can call. Currently only two ops exist: register and unregister. Subdevs can implement these to call the board code and pass it the v4l2_device pointer, which the board code can then use to get access to the struct that embeds the v4l2_device. It is expected that in the future open and close ops will also be added. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Родитель
3c7c9370fb
Коммит
45f6f84af3
|
@ -126,11 +126,19 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
|
|||
WARN_ON(sd->v4l2_dev != NULL);
|
||||
if (!try_module_get(sd->owner))
|
||||
return -ENODEV;
|
||||
sd->v4l2_dev = v4l2_dev;
|
||||
if (sd->internal_ops && sd->internal_ops->registered) {
|
||||
err = sd->internal_ops->registered(sd);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
/* This just returns 0 if either of the two args is NULL */
|
||||
err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler);
|
||||
if (err)
|
||||
if (err) {
|
||||
if (sd->internal_ops && sd->internal_ops->unregistered)
|
||||
sd->internal_ops->unregistered(sd);
|
||||
return err;
|
||||
sd->v4l2_dev = v4l2_dev;
|
||||
}
|
||||
spin_lock(&v4l2_dev->lock);
|
||||
list_add_tail(&sd->list, &v4l2_dev->subdevs);
|
||||
spin_unlock(&v4l2_dev->lock);
|
||||
|
@ -146,6 +154,8 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
|
|||
spin_lock(&sd->v4l2_dev->lock);
|
||||
list_del(&sd->list);
|
||||
spin_unlock(&sd->v4l2_dev->lock);
|
||||
if (sd->internal_ops && sd->internal_ops->unregistered)
|
||||
sd->internal_ops->unregistered(sd);
|
||||
sd->v4l2_dev = NULL;
|
||||
module_put(sd->owner);
|
||||
}
|
||||
|
|
|
@ -411,6 +411,21 @@ struct v4l2_subdev_ops {
|
|||
const struct v4l2_subdev_sensor_ops *sensor;
|
||||
};
|
||||
|
||||
/*
|
||||
* Internal ops. Never call this from drivers, only the v4l2 framework can call
|
||||
* these ops.
|
||||
*
|
||||
* registered: called when this subdev is registered. When called the v4l2_dev
|
||||
* field is set to the correct v4l2_device.
|
||||
*
|
||||
* unregistered: called when this subdev is unregistered. When called the
|
||||
* v4l2_dev field is still set to the correct v4l2_device.
|
||||
*/
|
||||
struct v4l2_subdev_internal_ops {
|
||||
int (*registered)(struct v4l2_subdev *sd);
|
||||
void (*unregistered)(struct v4l2_subdev *sd);
|
||||
};
|
||||
|
||||
#define V4L2_SUBDEV_NAME_SIZE 32
|
||||
|
||||
/* Set this flag if this subdev is a i2c device. */
|
||||
|
@ -427,6 +442,8 @@ struct v4l2_subdev {
|
|||
u32 flags;
|
||||
struct v4l2_device *v4l2_dev;
|
||||
const struct v4l2_subdev_ops *ops;
|
||||
/* Never call these internal ops from within a driver! */
|
||||
const struct v4l2_subdev_internal_ops *internal_ops;
|
||||
/* The control handler of this subdev. May be NULL. */
|
||||
struct v4l2_ctrl_handler *ctrl_handler;
|
||||
/* name must be unique */
|
||||
|
|
Загрузка…
Ссылка в новой задаче