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USB: usbtmc: Add USBTMC_IOCTL_GET_STB

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This new ioctl reads the status byte (STB) from the device and returns
the STB unmodified to the application. The srq_asserted bit is not taken
into account and not changed.

This ioctl is useful to support non USBTMC-488 compliant devices.

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/20201215155621.9592-3-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Penkler
2020-12-15 16:56:19 +01:00
committed by Greg Kroah-Hartman
parent 3c1037e2b6
commit c9784e23c1
2 changed files with 8 additions and 0 deletions
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6
drivers/usb/class/usbtmc.c
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@@ -2149,6 +2149,12 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
file_data->auto_abort = !!tmp_byte;
break;
case USBTMC_IOCTL_GET_STB:
retval = usbtmc_get_stb(file_data, &tmp_byte);
if (retval > 0)
retval = put_user(tmp_byte, (__u8 __user *)arg);
break;
case USBTMC_IOCTL_CANCEL_IO:
retval = usbtmc_ioctl_cancel_io(file_data);
break;