diff options
| -rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 5 | ||||
| -rw-r--r-- | include/media/v4l2-subdev.h | 20 |
2 files changed, 21 insertions, 4 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index e831aaca66f..f5fdb395287 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -192,6 +192,11 @@ You also need a way to go from the low-level struct to v4l2_subdev. For the common i2c_client struct the i2c_set_clientdata() call is used to store a v4l2_subdev pointer, for other busses you may have to use other methods. +Bridges might also need to store per-subdev private data, such as a pointer to +bridge-specific per-subdev private data. The v4l2_subdev structure provides +host private data for that purpose that can be accessed with +v4l2_get_subdev_hostdata() and v4l2_set_subdev_hostdata(). + From the bridge driver perspective you load the sub-device module and somehow obtain the v4l2_subdev pointer. For i2c devices this is easy: you call i2c_get_clientdata(). For other busses something similar needs to be done. diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 905879d7742..b0316a7cf08 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -438,17 +438,28 @@ struct v4l2_subdev { /* can be used to group similar subdevs, value is driver-specific */ u32 grp_id; /* pointer to private data */ - void *priv; + void *dev_priv; + void *host_priv; }; static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p) { - sd->priv = p; + sd->dev_priv = p; } static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd) { - return sd->priv; + return sd->dev_priv; +} + +static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p) +{ + sd->host_priv = p; +} + +static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd) +{ + return sd->host_priv; } static inline void v4l2_subdev_init(struct v4l2_subdev *sd, @@ -462,7 +473,8 @@ static inline void v4l2_subdev_init(struct v4l2_subdev *sd, sd->flags = 0; sd->name[0] = '\0'; sd->grp_id = 0; - sd->priv = NULL; + sd->dev_priv = NULL; + sd->host_priv = NULL; } /* Call an ops of a v4l2_subdev, doing the right checks against |