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@xxxxxxxxx>
Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/video/v4l2-device.c | 14 ++++++++++++--
include/media/v4l2-subdev.h | 17 +++++++++++++++++
2 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c
index 7fe6f92..b24f002 100644
--- a/drivers/media/video/v4l2-device.c
+++ b/drivers/media/video/v4l2-device.c
@@ -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);
}
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 42fbe46..daf1e57 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -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 */
--
1.7.0.4
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