Hi Ricardo,
Thanks for reply,
I replace `_IOWR('u', 0x20, struct uvc_xu_control_mapping)` to ` UVCIOC_CTRL_MAP` and got the same error,
Please check attachment for command output `strace -f ./uvc_xu_v4l_mapping_demo`
Best Regards,
Hardy
-----Original Message-----
From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
Sent: Friday, April 28, 2023 4:04 PM
To: hardycheng(鄭易昕) <hardycheng@xxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Subject: Re: UVCIOC_CTRL_MAP not work
Hi Hardy
Why are you using:
result = ioctl(fd, _IOWR('u', 0x20, struct uvc_xu_control_mapping), &mapping);
instead of
result = ioctl(fd, UVCIOC_CTRL_MAP, &mapping);
Can you return the output of:
strace -f uvc_xu_v4l_mapping_demo
Thanks!
On Fri, 28 Apr 2023 at 09:15, hardycheng(鄭易昕) <hardycheng@xxxxxxx> wrote:
>
> Hi,
>
> # Environment:
>
> OS = Ubuntu 22.04 LTS (Linux version 5.19.0-41-generic) Program
> Language = C Language
>
> # Overview:
>
> We plug in our UVC camera to PC, and try to use `UVCIOC_CTRL_MAP`
> function on PC to create the v4l2 control mapping, but we got error
> `UVCIOC_CTRL_MAP: Inappropriate ioctl for device` Development with `C
> language` in `Ubuntu 22.04 LTS`
>
> # Description:
>
> We have a custom UVC camera and we can modify the extension unit(XU)
> by ourself. (USB descriptions reference attachments
> `uvc_xu_descriptor.PNG` & `usb_decriptions.txt`)
>
> We make sure that UVCIOC_CTRL_QUERY is work to control our XU item
> (demo code in attachment `uvc_xu_ioctl_demo.c`)
>
> but UVCIOC_CTRL_MAP function fail with error message `UVCIOC_CTRL_MAP:
> Inappropriate ioctl for device` (demo code in attachment
> `uvc_xu_v4l_mapping_demo.c`)
>
> # Problems:
>
> 1. Is UVCIOC_CTRL_MAP function using in the PC host?
> 2. Can you found any syntax problem in our demo code `uvc_xu_v4l_mapping_demo.c`?
> 3. Is there any sample code about struct `uvc_xu_control_mapping` using?
>
> Looking forward to your reply,
> Best Regards,
> Hardy#2374
>
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