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usb: usbtmc: Add ioctl USBTMC_IOCTL_CANCEL_IO

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ioctl USBTMC_IOCTL_CANCEL_IO stops and kills all flying urbs of
last USBTMC_IOCTL_READ and USBTMC_IOCTL_WRITE function calls.
A subsequent call to USBTMC_IOCTL_READ or
USBTMC_IOCTL_WRITE_RESULT returns -ECANCELED with
information about current transferred data.

Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Reviewed-by: Steve Bayless <steve_bayless@keysight.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guido Kiener 2018-09-12 10:50:55 +02:00 committed by Greg Kroah-Hartman
parent bb99794a47
commit 46ecc9d54e
2 changed files with 7 additions and 0 deletions
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4
drivers/usb/class/usbtmc.c
View File

@ -2126,6 +2126,10 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case USBTMC488_IOCTL_TRIGGER:
retval = usbtmc488_ioctl_trigger(file_data);
break;
case USBTMC_IOCTL_CANCEL_IO:
retval = usbtmc_ioctl_cancel_io(file_data);
break;
}
skip_io_on_zombie:

3
include/uapi/linux/usb/tmc.h
View File

@ -97,6 +97,9 @@ struct usbtmc_message {
#define USBTMC488_IOCTL_LOCAL_LOCKOUT _IO(USBTMC_IOC_NR, 21)
#define USBTMC488_IOCTL_TRIGGER _IO(USBTMC_IOC_NR, 22)
/* Cancel and cleanup asynchronous calls */
#define USBTMC_IOCTL_CANCEL_IO _IO(USBTMC_IOC_NR, 35)
/* Driver encoded usb488 capabilities */
#define USBTMC488_CAPABILITY_TRIGGER 1
#define USBTMC488_CAPABILITY_SIMPLE 2