V4L/DVB (11025): soc-camera: configure drivers with a default format on open
Currently soc-camera doesn't set up any image format without an explicit S_FMT.
It seems this should be supported, since, for example, capture-example.c from
v4l2-apps by default doesn't issue an S_FMT. This patch configures a default
image format on open().
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 9939b04..fcd6b2c 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -30,6 +30,10 @@
#include <media/videobuf-core.h>
#include <media/soc_camera.h>
+/* Default to VGA resolution */
+#define DEFAULT_WIDTH 640
+#define DEFAULT_HEIGHT 480
+
static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock);
@@ -256,6 +260,44 @@
vfree(icd->user_formats);
}
+/* Called with .vb_lock held */
+static int soc_camera_set_fmt(struct soc_camera_file *icf,
+ struct v4l2_format *f)
+{
+ struct soc_camera_device *icd = icf->icd;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct v4l2_pix_format *pix = &f->fmt.pix;
+ int ret;
+
+ /* We always call try_fmt() before set_fmt() or set_crop() */
+ ret = ici->ops->try_fmt(icd, f);
+ if (ret < 0)
+ return ret;
+
+ ret = ici->ops->set_fmt(icd, f);
+ if (ret < 0) {
+ return ret;
+ } else if (!icd->current_fmt ||
+ icd->current_fmt->fourcc != pix->pixelformat) {
+ dev_err(&ici->dev,
+ "Host driver hasn't set up current format correctly!\n");
+ return -EINVAL;
+ }
+
+ icd->width = pix->width;
+ icd->height = pix->height;
+ icf->vb_vidq.field = pix->field;
+ if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
+ f->type);
+
+ dev_dbg(&icd->dev, "set width: %d height: %d\n",
+ icd->width, icd->height);
+
+ /* set physical bus parameters */
+ return ici->ops->set_bus_param(icd, pix->pixelformat);
+}
+
static int soc_camera_open(struct file *file)
{
struct video_device *vdev;
@@ -297,6 +339,15 @@
/* Now we really have to activate the camera */
if (icd->use_count == 1) {
+ struct v4l2_format f = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ .fmt.pix = {
+ .width = DEFAULT_WIDTH,
+ .height = DEFAULT_HEIGHT,
+ .field = V4L2_FIELD_ANY,
+ },
+ };
+
ret = soc_camera_init_user_formats(icd);
if (ret < 0)
goto eiufmt;
@@ -305,6 +356,14 @@
dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
goto eiciadd;
}
+
+ f.fmt.pix.pixelformat = icd->current_fmt->fourcc;
+ f.fmt.pix.colorspace = icd->current_fmt->colorspace;
+
+ /* Try to configure with default parameters */
+ ret = soc_camera_set_fmt(icf, &f);
+ if (ret < 0)
+ goto esfmt;
}
mutex_unlock(&icd->video_lock);
@@ -316,7 +375,12 @@
return 0;
- /* First two errors are entered with the .video_lock held */
+ /*
+ * First three errors are entered with the .video_lock held
+ * and use_count == 1
+ */
+esfmt:
+ ici->ops->remove(icd);
eiciadd:
soc_camera_free_user_formats(icd);
eiufmt:
@@ -415,16 +479,10 @@
{
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
- struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
- struct v4l2_pix_format *pix = &f->fmt.pix;
int ret;
WARN_ON(priv != file->private_data);
- ret = soc_camera_try_fmt_vid_cap(file, priv, f);
- if (ret < 0)
- return ret;
-
mutex_lock(&icf->vb_vidq.vb_lock);
if (videobuf_queue_is_busy(&icf->vb_vidq)) {
@@ -433,29 +491,7 @@
goto unlock;
}
- ret = ici->ops->set_fmt(icd, f);
- if (ret < 0) {
- goto unlock;
- } else if (!icd->current_fmt ||
- icd->current_fmt->fourcc != pix->pixelformat) {
- dev_err(&ici->dev,
- "Host driver hasn't set up current format correctly!\n");
- ret = -EINVAL;
- goto unlock;
- }
-
- icd->width = f->fmt.pix.width;
- icd->height = f->fmt.pix.height;
- icf->vb_vidq.field = pix->field;
- if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
- dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
- f->type);
-
- dev_dbg(&icd->dev, "set width: %d height: %d\n",
- icd->width, icd->height);
-
- /* set physical bus parameters */
- ret = ici->ops->set_bus_param(icd, pix->pixelformat);
+ ret = soc_camera_set_fmt(icf, f);
unlock:
mutex_unlock(&icf->vb_vidq.vb_lock);
@@ -642,8 +678,8 @@
a->bounds.height = icd->height_max;
a->defrect.left = icd->x_min;
a->defrect.top = icd->y_min;
- a->defrect.width = 640;
- a->defrect.height = 480;
+ a->defrect.width = DEFAULT_WIDTH;
+ a->defrect.height = DEFAULT_HEIGHT;
a->pixelaspect.numerator = 1;
a->pixelaspect.denominator = 1;