Hi Hardy Seems like you can only add mappings for V4L2_CTRL_TYPE_INTEGER, V4L2_CTRL_TYPE_BOOLEAN:V4L2_CTRL_TYPE_BUTTON and V4L2_CTRL_TYPE_MENU. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/media/usb/uvc/uvc_v4l2.c#n130 You are trying to add a map for a V4L2_CTRL_TYPE_STRING Regards On Fri, 28 Apr 2023 at 10:20, hardycheng(鄭易昕) <hardycheng@xxxxxxx> wrote: > > 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 > > > > *****CONFIDENTIAL INFORMATION***** > > > > This email is intended only for the use of the person or entity to > > whom it is addressed and contains information that may be subject to > > and/or may be restricted from disclosure by contract or applicable > > law. If you are not the intended recipient of this email, be advised > > that any disclosure, copy, distribution or use of the contents of this message is strictly prohibited. > > If you are not the intended recipient of this email, please notify the > > sender that you have received this in error by replying to this > > message. Then, please delete it from your system. Our Privacy Policy > > is available here https://www.msi.com/page/privacy-policy. Thank you. > > > > -- > Ricardo Ribalda > > > *****CONFIDENTIAL INFORMATION***** > > This email is intended only for the use of the person or entity to whom it is > addressed and contains information that may be subject to and/or may be > restricted from disclosure by contract or applicable law. If you are not the > intended recipient of this email, be advised that any disclosure, copy, > distribution or use of the contents of this message is strictly prohibited. > If you are not the intended recipient of this email, please notify the sender > that you have received this in error by replying to this message. Then, > please delete it from your system. Our Privacy Policy is available here > https://www.msi.com/page/privacy-policy. Thank you. -- Ricardo Ribalda
