Hi,
There are two solutions. But it never looks nice.
Does anyone have no idea ?
1. Save the struct s3c_fb in the v4l2_subdev.priv like:
In the s3cfb_probe:
v4l2_set_subdevdata(&sfb->sd, sfb);
platform_set_drvdata(pdev, &sfb->sd);
In the s3cfb_remove:
struct v4l2_subdev *sd = platform_get_drvdata(pdev);
struct s3c_fb *sfb = sd->priv;
In the s5p-fimc driver:
sd = dev_get_drvdata(dev);
-> This bothers s3cfb due to s5p-fimc driver.
2. let sd locate top of the struct s3c_fb like:
struct s3c_fb {
struct v4l2_subdev sd;
struct device *dev;
-> and then don't save the sfb->sd in the platform driver data.
It makes s3cfb driver use the platform driver data for its own purpose.
But you can get the v4l2_subdev pointer in s5p-fimc driver using
dev_get_drvdata.
The reason how to get the pointer is that the address of v4l2_subdev is same
with s3cfb's platform driver data.
BRs,
> -----Original Message-----
> From: linux-media-ow...@vger.kernel.org [mailto:linux-media-
> ow...@vger.kernel.org] On Behalf Of Sungchun Kang
> Sent: Wednesday, February 23, 2011 8:17 PM
> To: linux-media@vger.kernel.org
> Subject: Hello, how to control FrameBuffer device as v4l2 sub-device?
>
> FIMC is hardware function like csc, post, rotatin and so on.
> It is necessary to send some data to FB from FIMC.
>
> So, I have registered FB driver as v4l2 sub-device of FIMC.
> ----------------
> | v4l2_device |
> ----------------
> | fimc-0 |----------------
> | | |
> ---------------- |
> | |
> ---------------- ----------------
> | v4l2_subdev | | v4l2_subdeve |
> ---------------- ----------------
> | FB1 | | mipi-csi, |
> | FB2 | | senor |
> ---------------- ----------------
> And, it is controlled using platform_get_drvdata and platform_set_drvdata
> between FIMC and FB drvier.
> But, FB driver uses drvdata for its own purpose. If I set v4l2_subdev ptr
> like this :
> platform_set_drvdata(pdev, &sfb->sd); // v4l2_subdev sd;
>
> platform_device ptr is changed.
>
> Because FB driver aleady set like this :
> platform_set_drvdata(pdev, sfb);
>
> So, I wonder how to control data between 2 hardware.
>
> If you have some idea, pls reply.
>
> BRs,
>
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