Hi Sergio
On Mon, 7 Mar 2011, Sergio Aguirre wrote:
> This helps redirect mmap calls to custom memory managers which
> already have preallocated space to use by the device.
>
> Otherwise, device might not support the allocation attempted
> generically by videobuf.
>
> Signed-off-by: Sergio Aguirre <saagui...@ti.com>
> ---
> drivers/media/video/soc_camera.c | 7 ++++++-
> include/media/soc_camera.h | 2 ++
> 2 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/media/video/soc_camera.c
> b/drivers/media/video/soc_camera.c
> index 59dc71d..d361ba0 100644
> --- a/drivers/media/video/soc_camera.c
> +++ b/drivers/media/video/soc_camera.c
> @@ -512,6 +512,7 @@ static ssize_t soc_camera_read(struct file *file, char
> __user *buf,
> static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
> {
> struct soc_camera_device *icd = file->private_data;
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
This doesn't seem to be needed
> int err;
>
> dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
> @@ -519,7 +520,11 @@ static int soc_camera_mmap(struct file *file, struct
> vm_area_struct *vma)
> if (icd->streamer != file)
> return -EBUSY;
>
> - err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
> + /* Check for an interface custom mmaper */
mmapper - double 'p'
> + if (ici->ops->mmap)
> + err = ici->ops->mmap(&icd->vb_vidq, icd, vma);
> + else
> + err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
You're patching an old version of soc-camera. Please use a current one
with support for videobuf2. Further, wouldn't it be possible for you to
just replace the videobuf mmap_mapper() (videobuf2 q->mem_ops->mmap())
method? I am not sure how possible this is, maybe one of videobuf2 experts
could help us? BTW, you really should be using the videobuf2 API.
>
> dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
> (unsigned long)vma->vm_start,
> diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
> index de81370..11350c2 100644
> --- a/include/media/soc_camera.h
> +++ b/include/media/soc_camera.h
> @@ -87,6 +87,8 @@ struct soc_camera_host_ops {
> int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
> int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
> int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
> + int (*mmap)(struct videobuf_queue *, struct soc_camera_device *,
> + struct vm_area_struct *);
> unsigned int (*poll)(struct file *, poll_table *);
> const struct v4l2_queryctrl *controls;
> int num_controls;
> --
> 1.7.1
>
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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