Get the report identifier used by this HID report.
USB_GET_REPORT_DESC (Vt struct usb_ctl_report_desc
)
Get the HID report descriptor.
Using
this descriptor the exact layout and meaning of data to/from
the device can be found.
The report descriptor is delivered
without any processing.
struct usb_ctl_report_desc {
int ucrd_size;
u_char ucrd_data[1024]; /* filled data size will vary */
};
USB_SET_IMMED (Vt int
)
Sets the device in a mode where each
read(2)
will return the current value of the input report.
Normally
a
read(2)
will only return the data that the device reports on its
interrupt pipe.
This call may fail if the device does not support
this feature.
USB_GET_REPORT (Vt struct usb_ctl_report
)
Get a report from the device without waiting for data on
the interrupt pipe.
The
report
field indicates which report is requested.
It should be
UHID_INPUT_REPORTUHID_OUTPUT_REPORT
or
UHID_FEATURE_REPORT
This call may fail if the device does not support this feature.
struct usb_ctl_report {
int ucr_report;
u_char ucr_data[1024]; /* used data size will vary */
};
USB_SET_REPORT (Vt struct usb_ctl_report
)
Set a report in the device.
The
report
field indicates which report is to be set.
It should be
UHID_INPUT_REPORTUHID_OUTPUT_REPORT
or
UHID_FEATURE_REPORT
This call may fail if the device does not support this feature.
Use
read(2)
to get data from the device.
Data should be read in chunks of the
size prescribed by the report descriptor.
Use
write(2)
to send data to the device.
Data should be written in chunks of the
size prescribed by the report descriptor.
