On 01/06/2014 03:30 PM, Tom wrote:
> Hello,
>
> I want to add some driver specific ctrls to my ctrl-handler which are not
> defined in the "/include/uapi/linux/v4l2-controls.h".
> I read that I would need the "V4L2_CID_PRIVATE_BASE" to define the new IDs,
> but I don't get how I can add them to my ctrl-handler so that they are
> accessible by calling VIDIOC_S_CTRL.
Don't use V4L2_CID_PRIVATE_BASE, that doesn't work with the control framework
(for good but somewhat obscure reasons).
Instead use (V4L2_CID_USER_BASE | 0x1000) as the base for your private controls.
If you want to upstream the code, then you should define a range for the private
controls of this driver in v4l2-controls.h. Search for e.g.
V4L2_CID_USER_S2255_BASE
in that header to see how it is done.
Regards,
Hans
>
> Can someone give me a hint how I can add my own controls to my ctrl-handler?
>
> what I tried:
>
> #define V4L2_SENS_TEST1 (V4L2_CID_PRIVATE_BASE + 1)
> #define V4L2_SENS_TEST2 (V4L2_CID_PRIVATE_BASE + 2)
> #define V4L2_SENS_TEST3 (V4L2_CID_PRIVATE_BASE + 3)
>
> static int ov3640_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> .
> .
> .
> //I can add the standard controls as usual...
>
> v4l2_ctrl_handler_init(&ov3640->ctrl_handler, 19);
>
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_CID_BRIGHTNESS, -48, 48, 1, 0);
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_CID_CONTRAST, -12, 12, 1, 0);
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_CID_SATURATION, -32, 32, 1, 0);
> .
> .
> .
> //so far so good...
>
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_SENS_TEST1, 0, 1, 1, 0);
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_SENS_TEST2, 0, 1, 1, 0);
> v4l2_ctrl_new_std(&ov3640->ctrl_handler, &ov3640_ctrl_ops,
> V4L2_SENS_TEST3, 0, 1, 1, 0);
>
> //but I cannot add these three controls like this.
>
> if (ov3640->ctrl_handler.error) {
> dev_err(&client->dev, "control initialization error %d\n",
> ov3640->ctrl_handler.error);
> ret = ov3640->ctrl_handler.error;
> goto done;
> }
>
> //the ctrl-handler will give me an ERROR back when adding these 3 controls
>
> }
>
> static int ov3640_ctrl(struct v4l2_ctrl *ctrl, int command)
> {
> struct ov3640 *ov3640 = container_of(ctrl->handler, struct ov3640,
> ctrl_handler);
> int ret = 0;
>
> switch (ctrl->id) {
> case V4L2_CID_BRIGHTNESS:
> ret = ov3640_set_brightness(ov3640, ctrl->val, command);
> break;
> case V4L2_CID_CONTRAST:
> ret = ov3640_set_contrast(ov3640, ctrl->val, command);
> break;
> case V4L2_CID_SATURATION:
> ret = ov3640_set_saturation(ov3640, ctrl->val, command);
> break;
> case V4L2_SENS_TEST1://!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> case V4L2_SENS_TEST2://!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> case V4L2_SENS_TEST3://!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> ret = ov3640_test(ov3640, ctrl->val, ctrl->id, command);
> break;
> }
>
> return ret;
> }
>
> static int ov3640_set_ctrl(struct v4l2_ctrl *ctrl)
> {
> int ret;
> int command = SET_DATA;
>
> ret = ov3640_ctrl(ctrl, command);
> return ret;
> }
>
> static int ov3640_get_ctrl(struct v4l2_ctrl *ctrl)
> {
> int ret;
> int command = GET_DATA;
>
> ret = ov3640_ctrl(ctrl, command);
> return ret;
> }
>
> static struct v4l2_ctrl_ops ov3640_ctrl_ops = {
> .s_ctrl = ov3640_set_ctrl,
> .g_volatile_ctrl = ov3640_get_ctrl,
> };
>
> Best Regards, Tom
>
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