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usb: usbtmc: add ioctl USBTMC_IOCTL_MSG_IN_ATTR

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add ioctl USBTMC_IOCTL_MSG_IN_ATTR that returns the specific
bmTransferAttributes field of the last DEV_DEP_MSG_IN Bulk-IN
header. This header is received by the read() function. The
meaning of the (u8) bitmap bmTransferAttributes is:

Bit 0 = EOM flag is set when the last transfer of a USBTMC
message is received.

Bit 1 = is set when the last byte is a termchar (e.g. '\n').
Note that this bit is always zero when the device does not support
the termchar feature or when termchar detection is not enabled
(see ioctl USBTMC_IOCTL_CONFIG_TERMCHAR).

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 10:50:59 +02:00 • committed by Greg Kroah-Hartman
parent 739240a9f6
commit 8409e96f01
2 changed files with 10 additions and 0 deletions
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2
include/uapi/linux/usb/tmc.h
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@ -98,6 +98,8 @@ struct usbtmc_message {
#define USBTMC488_IOCTL_TRIGGER _IO(USBTMC_IOC_NR, 22)
#define USBTMC488_IOCTL_WAIT_SRQ _IOW(USBTMC_IOC_NR, 23, __u32)
#define USBTMC_IOCTL_MSG_IN_ATTR _IOR(USBTMC_IOC_NR, 24, __u8)
/* Cancel and cleanup asynchronous calls */
#define USBTMC_IOCTL_CANCEL_IO _IO(USBTMC_IOC_NR, 35)
#define USBTMC_IOCTL_CLEANUP_IO _IO(USBTMC_IOC_NR, 36)