RE: UVCIOC_CTRL_MAP not work

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

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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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[-- Attachment #2: strace_20230428.log --]
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root@ubuntu22:/ms5548_test# strace -f ./uvc_xu_v4l_mapping_demo
execve("./uvc_xu_v4l_mapping_demo", ["./uvc_xu_v4l_mapping_demo"], 0x7fff9c969de8 /* 76 vars */) = 0
brk(NULL)                               = 0x55baa8504000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc59064f70) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb94c41f000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=65987, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 65987, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fb94c40e000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\237\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
pread64(3, "\4\0\0\0 \0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0"..., 48, 848) = 48
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0i8\235HZ\227\223\333\350s\360\352,\223\340."..., 68, 896) = 68
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=2216304, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2260560, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb94c000000
mmap(0x7fb94c028000, 1658880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7fb94c028000
mmap(0x7fb94c1bd000, 360448, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bd000) = 0x7fb94c1bd000
mmap(0x7fb94c215000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x214000) = 0x7fb94c215000
mmap(0x7fb94c21b000, 52816, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fb94c21b000
close(3)                                = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb94c40b000
arch_prctl(ARCH_SET_FS, 0x7fb94c40b740) = 0
set_tid_address(0x7fb94c40ba10)         = 6285
set_robust_list(0x7fb94c40ba20, 24)     = 0
rseq(0x7fb94c40c0e0, 0x20, 0, 0x53053053) = 0
mprotect(0x7fb94c215000, 16384, PROT_READ) = 0
mprotect(0x55baa6c47000, 4096, PROT_READ) = 0
mprotect(0x7fb94c459000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7fb94c40e000, 65987)           = 0
openat(AT_FDCWD, "/dev/video0", O_RDWR) = 3
ioctl(3, UVCIOC_CTRL_MAP, 0x7ffc59064fb0) = -1 ENOTTY (Inappropriate ioctl for device)
dup(2)                                  = 4
fcntl(4, F_GETFL)                       = 0x2 (flags O_RDWR)
getrandom("\x87\xd1\x7a\x35\xc1\x4e\xa8\x44", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55baa8504000
brk(0x55baa8525000)                     = 0x55baa8525000
newfstatat(4, "", {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0), ...}, AT_EMPTY_PATH) = 0
write(4, "UVCIOC_CTRL_MAP: Inappropriate i"..., 48UVCIOC_CTRL_MAP: Inappropriate ioctl for device
) = 48
close(4)                                = 0
close(3)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++