Move the gpib drivers out of staging and into the "real" part of the
kernel.  This entails:

 - Remove the gpib Kconfig menu and Makefile build rule from staging.
 - Remove gpib/uapi from the header file search path in subdir-ccflags
   of the gpib Makefile
 - move the gpib/uapi files to include/uapi/linux
 - Move the gpib tree out of staging to drivers.
 - Remove the word "Linux" from the gpib Kconfig file.
 - Add the gpib Kconfig menu and Makefile build rule to drivers

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://patch.msgid.link/20251117144021.23569-5-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

As part destaging the gpib drivers we need to add the
WITH Linux-syscall-note to the SPDX license in the gpib
common includes as these will be part of the kernel headers.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://patch.msgid.link/20251117144021.23569-4-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

A ppc64 randconfig build complained about the // comments in the uapi
header file:
error: // comments are not allowed in this language [-Werror,-Wcomment]

Change the // comments to /* */ format.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511141203.sbp27oAR-lkp@intel.com/
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://patch.msgid.link/20251117144021.23569-2-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Ensure that all structs have a size that is an integral mutliple
of 32 bits.

Change trailing single bit field to __u32 in gpib_open_dev_ioctl
Add byte padding to  gpib_serial_poll_ioctl and gpib_request_service2
Add bit padding to gpib_board_info_ioctl and gpib_ppoll_config_ioctl

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250603184320.30594-5-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Change unsigned int to __u32,
       int          to __s32
  and  short        to __s16

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250603184320.30594-4-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove enums and functions that do not need to be shared
with user space.

Remove enums and functions that are not needed in the kernel drivers.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250603184320.30594-2-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

GPIB secondary addresses have valid values between 0 and 31
inclusive. The Make Secondary Address function MSA, used to form
the protocol byte, was using the gpib_address_restrict function
erroneously restricting the address range to 0 through 30.

Remove the call to gpib_address_restrict and simply trim the
address to 5 bits.

Fixes: 2da03e7e31aa ("staging: gpib: Add user api include files")
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250520155100.5808-1-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

When gpib_user.h was renamed to gpio.h the include guard name was
not changed accordingly.

Change the include guard name to correspond with the file name
and cleanup the comments after the #endif.

Fixes: c7184cbf5530 ("staging: gpib: Rename common include file")
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250509113014.9105-1-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

User code includes gpib_user.h. Since this include has diverged
from the original by
  - removing unused functions and defines
  - changing camel-case identifiers
  - removing typedefs
we need to change the name of the kernel include. This include
will be included in the userland gpib_user.h ensuring backward
compatibility for application programmes.

Rename the file and change the references to it.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250418093111.8820-3-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The error code and timeout code enums are not used by any
of the gpib kernel code.  This patch removes them.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250418093111.8820-2-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>