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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> |
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| .. | ||
| audio.h | ||
| cdc-wdm.h | ||
| cdc.h | ||
| ch9.h | ||
| ch11.h | ||
| charger.h | ||
| functionfs.h | ||
| g_printer.h | ||
| g_uvc.h | ||
| gadgetfs.h | ||
| midi.h | ||
| raw_gadget.h | ||
| tmc.h | ||
| video.h | ||