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[media] v4l: subdev: Add pad config allocator and init
Add a new subdev operation to initialize a subdev pad config array, and a helper function to allocate and initialize the array. This can be used by bridge drivers to implement try format based on subdev pad operations. Signed-off-by: Laurent Pinchart <laurent.pinchart@linaro.org> Acked-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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parent
45b46879a7
commit
9b02cbb3ed
2 changed files with 43 additions and 4 deletions
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@ -35,9 +35,11 @@
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static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
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if (fh->pad == NULL)
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return -ENOMEM;
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if (sd->entity.num_pads) {
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fh->pad = v4l2_subdev_alloc_pad_config(sd);
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if (fh->pad == NULL)
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return -ENOMEM;
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}
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#endif
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return 0;
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}
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@ -45,7 +47,7 @@ static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
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static void subdev_fh_free(struct v4l2_subdev_fh *fh)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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kfree(fh->pad);
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v4l2_subdev_free_pad_config(fh->pad);
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fh->pad = NULL;
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#endif
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}
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@ -569,6 +571,35 @@ int v4l2_subdev_link_validate(struct media_link *link)
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sink, link, &source_fmt, &sink_fmt);
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}
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EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
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struct v4l2_subdev_pad_config *
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v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
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{
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struct v4l2_subdev_pad_config *cfg;
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int ret;
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if (!sd->entity.num_pads)
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return NULL;
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cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return NULL;
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ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
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if (ret < 0 && ret != -ENOIOCTLCMD) {
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kfree(cfg);
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return NULL;
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}
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return cfg;
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}
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EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
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void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
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{
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kfree(cfg);
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}
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EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
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#endif /* CONFIG_MEDIA_CONTROLLER */
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void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
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@ -572,6 +572,7 @@ struct v4l2_subdev_pad_config {
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/**
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* struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
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*
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* @init_cfg: initialize the pad config to default values
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* @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler
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* code.
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* @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler
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@ -607,6 +608,8 @@ struct v4l2_subdev_pad_config {
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* may be adjusted by the subdev driver to device capabilities.
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*/
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struct v4l2_subdev_pad_ops {
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int (*init_cfg)(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg);
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int (*enum_mbus_code)(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_mbus_code_enum *code);
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@ -801,7 +804,12 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
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struct v4l2_subdev_format *source_fmt,
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struct v4l2_subdev_format *sink_fmt);
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int v4l2_subdev_link_validate(struct media_link *link);
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struct v4l2_subdev_pad_config *
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v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);
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void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
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#endif /* CONFIG_MEDIA_CONTROLLER */
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void v4l2_subdev_init(struct v4l2_subdev *sd,
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const struct v4l2_subdev_ops *ops);
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