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[media] V4L: soc_camera: allow reading from video device if supported 

Try reading on video device. If the camera bus driver supports reading
we can try it and return the result. Also add a debug line.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Anatolij Gustschin 2012-08-24 11:36:11 -03:00 committed by Mauro Carvalho Chehab
parent 0dc2d84961
commit 1438be56ad
1 changed files with 8 additions and 2 deletions
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10
drivers/media/platform/soc_camera/soc_camera.c
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@ -645,11 +645,17 @@ static ssize_t soc_camera_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct soc_camera_device *icd = file->private_data;
int err = -EINVAL;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
dev_dbg(icd->pdev, "read called, buf %p\n", buf);
if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
return vb2_read(&icd->vb2_vidq, buf, count, ppos,
file->f_flags & O_NONBLOCK);
dev_err(icd->pdev, "camera device read not implemented\n");
return err;
return -EINVAL;
}
static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)