Dave Penkler d1d9defdc6 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>		2020-12-28 15:50:30 +01:00
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cdc-acm.c	usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode	2020-11-13 15:26:49 +01:00
cdc-acm.h	usb: cdc-acm: fix cooldown mechanism	2020-10-28 13:20:21 +01:00
cdc-wdm.c	USB: cdc-wdm: Make wdm_flush() interruptible and add wdm_fsync().	2020-10-02 11:30:10 +02:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	USB: add SPDX identifiers to all remaining Makefiles	2017-11-07 15:53:48 +01:00
usblp.c	usblp: fix race between disconnect() and read()	2020-09-17 18:45:30 +02:00
usbtmc.c	USB: usbtmc: Add separate USBTMC_IOCTL_GET_SRQ_STB	2020-12-28 15:50:30 +01:00