diff options
| author | Dave Penkler <dpenkler@gmail.com> | 2020-12-15 18:56:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-28 17:50:30 +0300 |
| commit | c9784e23c1020e63d6dba5e10ca8bf3d8b85c19c (patch) | |
| tree | 2176279dfc23b60ecd1db93876358e8adf58c0e3 /drivers/usb/class | |
| parent | 3c1037e2b6a94898f81ed1a68bea146a9db750a5 (diff) | |
| download | linux-c9784e23c1020e63d6dba5e10ca8bf3d8b85c19c.tar.xz | |
USB: usbtmc: Add USBTMC_IOCTL_GET_STB
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>
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 189f06dcb7d3..8918e2182eca 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -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; |