diff options
| author | Dave Penkler <dpenkler@gmail.com> | 2016-01-27 19:22:28 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-03 13:54:06 -0800 |
| commit | 29779d89fd049bfc6c07f19aaf9b8d19fe2ecc8c (patch) | |
| tree | d784934a3de29284ed67366805bcca6b039527b1 /drivers/usb/class/usbtmc.c | |
| parent | eb6b92ecc0f9412623ab1584ddd8389b371638d4 (diff) | |
Add ioctl to retrieve USBTMC-USB488 capabilities
This is a convenience function to obtain an instrument's
capabilities from its file descriptor without having to access sysfs
from the user program.
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/usbtmc.c')
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 867842951ea0..6edb21ca9989 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -102,6 +102,9 @@ struct usbtmc_device_data { u16 iin_wMaxPacketSize; atomic_t srq_asserted; + /* coalesced usb488_caps from usbtmc_dev_capabilities */ + __u8 usb488_caps; + u8 rigol_quirk; /* attributes from the USB TMC spec for this device */ @@ -993,6 +996,7 @@ static int get_capabilities(struct usbtmc_device_data *data) data->capabilities.device_capabilities = buffer[5]; data->capabilities.usb488_interface_capabilities = buffer[14]; data->capabilities.usb488_device_capabilities = buffer[15]; + data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4); rv = 0; err_out: @@ -1168,6 +1172,14 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) retval = usbtmc_ioctl_abort_bulk_in(data); break; + case USBTMC488_IOCTL_GET_CAPS: + retval = copy_to_user((void __user *)arg, + &data->usb488_caps, + sizeof(data->usb488_caps)); + if (retval) + retval = -EFAULT; + break; + case USBTMC488_IOCTL_READ_STB: retval = usbtmc488_ioctl_read_stb(data, (void __user *)arg); break; |