[PATCH v2] V4L: soc_camera: allow reading from video device if supported

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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@xxxxxxx>
---
 v2: - rebased on current staging/for_v3.7 branch
 
 drivers/media/platform/soc_camera/soc_camera.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index 10b57f8..d591a42 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -645,9 +645,16 @@ 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;
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 	int err = -EINVAL;
 
-	dev_err(icd->pdev, "camera device read not implemented\n");
+	dev_dbg(icd->pdev, "read called, buf %p\n", buf);
+
+	if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
+		err = vb2_read(&icd->vb2_vidq, buf, count, ppos,
+				file->f_flags & O_NONBLOCK);
+	else
+		dev_err(icd->pdev, "camera device read not implemented\n");
 
 	return err;
 }
-- 
1.7.1

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