Hi Guennadi
Thank you very much for your answer.
The driver is a modified OV5642.c for the Omnivision OV5642 sensor. The
platform is a custom AT91SAM9M10 board with a camera paralell interface.
the driver is working quite well (capturing images) apart the set control
interface.
Unfortunately I cannot move to the most current kernel now.
Thanks again
Regards
Marcio
Em 08/05/2014, à(s) 17:14, Guennadi Liakhovetski <g.liakhovet...@gmx.de>
escreveu:
> Hi Marcio,
>
> Firstly, please direct all V4L related questions to the linux-media list
> (added to CC), secondly, your problem will have much better chances to
> attract attention if you use a current kernel, thirdly, please, specify
> which camera host driver / which ARM platform you're dealing with.
>
> Thanks
> Guennadi
>
> On Thu, 8 May 2014, Marcio Campos de Lima wrote:
>
>> Hi
>>
>> Can anybody tell me why the set control function is not working in Linux
>> 3.6.9? Thanks.
>>
>> —— APPLICATION CALL ——
>> struct v4l2_control controle;
>> controle.id = VIDIOC_AVANCA_ZOOM;
>> controle.value = time;
>> if (-1 == xioctl(fd_camera, VIDIOC_S_CTRL,&controle))
>> {
>> printf ("%s erro\n",__FUNCTION__);
>> perror ("erro iotcl");
>> }
>>
>> The ioctl call returns with invalid argument. It is amazing because the
>> first time the ioctl is called it is executed ok. Then no more call is
>> allowed and return the invalid
>>
>> below is the device driver code I think may be relevant.
>>
>> v4l2_ctrl_handler_init(&priv->ctrls, ARRAY_SIZE(ov5642_ctrls));
>> printk ("handler_init\n");
>> v4l2_ctrl_new_std(&priv->ctrls, &ov5642_ctrl_ops,V4L2_CID_ZOOM_RELATIVE,
>> -1000, 1000, 1, 500);
>> v4l2_ctrl_new_std(&priv->ctrls, &ov5642_ctrl_ops,V4L2_CID_FLASH_STROBE,
>> -100, 100, 1, 5);
>>
>>
>> priv->subdev.ctrl_handler=&priv->ctrls;
>> v4l2_i2c_subdev_init(&priv->subdev, client, &ov5642_subdev_ops);
>> return ov5642_video_probe(client);
>>
>> static int ov5642_s_ctrl(struct v4l2_ctrl *ctrl)
>> {
>> struct ov5642 *ov5642 =
>> container_of(ctrl->handler, struct ov5642, ctrls);
>> struct i2c_client *client = v4l2_get_subdevdata(&ov5642->subdev);
>> u16 data;
>> int ret;
>> printk ("%s: id=%08x val=%d\n",__FUNCTION__, ctrl->id, ctrl->val);
>> switch (ctrl->id) {
>> case V4L2_CID_DO_WHITE_BALANCE:
>> ov5640_set_wb_oem(client, ctrl->val);
>> break;
>> case V4L2_CID_EXPOSURE:
>>
>> break;
>> case V4L2_CID_GAIN:
>> /* Gain is controlled by 2 analog stages and a digital stage.
>> * Valid values for the 3 stages are
>> *
>> * Stage Min Max Step
>> * ------------------------------------------
>> * First analog stage x1 x2 1
>> * Second analog stage x1 x4 0.125
>> * Digital stage x1 x16 0.125
>> *
>> * To minimize noise, the gain stages should be used in the
>> * second analog stage, first analog stage, digital stage order.
>> * Gain from a previous stage should be pushed to its maximum
>> * value before the next stage is used.
>> */
>> if (ctrl->val <= 32) {
>> data = ctrl->val;
>> } else if (ctrl->val <= 64) {
>> ctrl->val &= ~1;
>> data = (1 << 6) | (ctrl->val >> 1);
>> } else {
>> ctrl->val &= ~7;
>> data = ((ctrl->val - 64) << 5) | (1 << 6) | 32;
>> }
>> break;
>> case V4L2_CID_ZOOM_RELATIVE:
>> if (ctrl->val>0)
>> avanca_zoom(sysPriv.v4l2_int_device, ctrl->val);
>> else
>> recua_zoom(sysPriv.v4l2_int_device, ctrl->val);
>>
>> break;
>> case V4L2_CID_BRIGHTNESS:
>> ov5640_set_brightness(client, ctrl->val);
>> break;
>> case V4L2_CID_CONTRAST:
>> ov5640_set_contrast(client, ctrl->val);
>> break;
>> case V4L2_CID_FLASH_STROBE:
>> ativa_flash (sysPriv.v4l2_int_device, ctrl->val);
>> break;
>> case V4L2_CID_VFLIP:
>>
>> case V4L2_CID_TEST_PATTERN:
>>
>>
>>
>> case V4L2_CID_BLC_AUTO:
>>
>> case V4L2_CID_BLC_TARGET_LEVEL:
>>
>> case V4L2_CID_BLC_ANALOG_OFFSET:
>>
>> case V4L2_CID_BLC_DIGITAL_OFFSET:
>> return 1;
>> }
>>
>> return 0;
>> }
>>
>> static struct v4l2_ctrl_ops ov5642_ctrl_ops = {
>> .s_ctrl = ov5642_s_ctrl,
>> };
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-ker...@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
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