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| author | Dave Penkler <dpenkler@gmail.com> | 2020-12-15 16:56:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-28 15:50:30 +0100 |
| commit | d1d9defdc6d582119d29f5d88f810b72bb1837fa (patch) | |
| tree | f3dce4bbad4c77f09e8d3876602afd8f81171e86 /include/uapi/linux/audit.h | |
| parent | c9784e23c1020e63d6dba5e10ca8bf3d8b85c19c (diff) | |
| download | linux-d1d9defdc6d582119d29f5d88f810b72bb1837fa.tar.gz linux-d1d9defdc6d582119d29f5d88f810b72bb1837fa.tar.bz2 linux-d1d9defdc6d582119d29f5d88f810b72bb1837fa.zip | |
USB: usbtmc: Add separate USBTMC_IOCTL_GET_SRQ_STB
This new ioctl only returns the status byte (STB) that was originally
sent by the device due to a service request (SRQ) condition.
This ioctl checks the srq_asserted bit of the associated file
descriptor. If set, the srq_asserted bit is reset and the cached
STB with original SRQ information is returned. Otherwise the ioctl
returns the error code ENOMSG.
This ioctl is useful to support non USBTMC-488 compliant devices.
Time sensitive applications can read the cached STB without incurring
the cost of an urb transaction over the bus.
Tested-by: Jian-Wei Wu <jian-wei_wu@keysight.com>
Reviewed-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20201215155621.9592-4-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi/linux/audit.h')
0 files changed, 0 insertions, 0 deletions