RE: UVCIOC_CTRL_MAP not work

["hardycheng(鄭易昕)" <hardycheng@msi.com>]

Hi Ricardo,

I need to sincerely apologize to you for my mistake of implanting the wrong GUID, which resulted in the device not being found. 
This was a foolish error on my part and I am sorry for taking up your valuable time.

Thank you again for your help.

Best Regards,
Hardy

-----Original Message-----
From: hardycheng(鄭易昕) 
Sent: Friday, April 28, 2023 5:10 PM
To: Ricardo Ribalda <ribalda@chromium.org>
Cc: linux-media@vger.kernel.org
Subject: RE: UVCIOC_CTRL_MAP not work

Hi Ricardo,

Seems like no more message of XU controls, I run my program in time [10246.557462], the relevant message is as follows:
[10246.557462] usb 1-1: uvc_v4l2_open
[10246.625260] usb 1-1: Resuming interface 0 [10246.625266] usb 1-1: Resuming interface 1 [10246.645515] usb 1-1: uvc_v4l2_release

Please check attachment of dmseg output `dmesg_20230428.log`


Best Regards,
Hardy#2374


-----Original Message-----
From: Ricardo Ribalda <ribalda@chromium.org>
Sent: Friday, April 28, 2023 4:58 PM
To: hardycheng(鄭易昕) <hardycheng@msi.com>
Cc: linux-media@vger.kernel.org
Subject: Re: UVCIOC_CTRL_MAP not work

What about:

rmmod uvcvideo
modprobe uvcvideo trace=0xffffffff

then run your program

You might be able to figure out what xu controls are discovered.


On Fri, 28 Apr 2023 at 10:50, hardycheng(鄭易昕) <hardycheng@msi.com> wrote:
>
> Hi Ricardo,
>
> Thank you for such a quick reply.
> Follow your advice, but I just got few logs in dmesg
>
> [ 9452.677337] usb 1-1: uvc_v4l2_open
> [ 9452.725254] usb 1-1: Resuming interface 0 [ 9452.725258] usb 1-1: 
> Resuming interface 1 [ 9452.751971] usb 1-1: uvc_v4l2_release [ 
> 9455.236973] usb 1-1: Suspending interface 1 [ 9455.236977] usb 1-1:
> Suspending interface 0
>
> Is there any way to get more debug message about this issue?
>
>
> Best Regards,
> Hardy#2374
>
>
> -----Original Message-----
> From: Ricardo Ribalda <ribalda@chromium.org>
> Sent: Friday, April 28, 2023 4:45 PM
> To: hardycheng(鄭易昕) <hardycheng@msi.com>
> Cc: linux-media@vger.kernel.org
> Subject: Re: UVCIOC_CTRL_MAP not work
>
> Hi Hardy
>
> try running:
>
> echo 0xffffffff > /sys/module/uvcvideo/parameters/trace
>
> and then your program
>
> and then dmesg
>
> It will tell you where it got stock
>
> Regards!
>
> On Fri, 28 Apr 2023 at 10:38, hardycheng(鄭易昕) <hardycheng@msi.com> wrote:
> >
> > Hi Ricardo,
> >
> > So I modify the `uvc_xu_control_mapping` struct as follows:
> > (full code reference attachment `uvc_xu_v4l_mapping_demo.c`) struct 
> > uvc_xu_control_mapping mapping = {
> >         .id = 0x01,
> >         .name = "My Extension Unit",
> >         .entity = {0x10, 0xbc, 0x46, 0xba, 0x28, 0x5a, 0x4d, 0x7b, 0x97, 0x0e, 0xfd, 0x91, 0x46, 0xa5, 0x2f, 0x2d},
> >         .selector = 0x01,
> >         .size = 32,
> >         .offset = 0,
> >         .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
> >         .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
> >         .menu_info = NULL,
> >         .menu_count = 0,
> >         .reserved = {0},
> > };
> >
> > And I got difference error message `UVCIOC_CTRL_MAP: No such file or 
> > directory` Please check attachment `strace_20230428_2.log` for 
> > strace output
> >
> >
> > Best Regards,
> > Hardy
> >
> >
> > -----Original Message-----
> > From: Ricardo Ribalda <ribalda@chromium.org>
> > Sent: Friday, April 28, 2023 4:26 PM
> > To: hardycheng(鄭易昕) <hardycheng@msi.com>
> > Cc: linux-media@vger.kernel.org
> > Subject: Re: UVCIOC_CTRL_MAP not work
> >
> > 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/t
> > re
> > e/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@msi.com> 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@chromium.org>
> > > Sent: Friday, April 28, 2023 4:04 PM
> > > To: hardycheng(鄭易昕) <hardycheng@msi.com>
> > > Cc: linux-media@vger.kernel.org
> > > 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@msi.com> 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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> > > --
> > > Ricardo Ribalda
> > >
> > >
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--
Ricardo Ribalda


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