set_output_report

src/ffi.rs

@@ -44,6 +44,11 @@ extern "C" {
     pub fn hid_libusb_wrap_sys_device(sys_dev: intptr_t, interface_num: c_int) -> *mut HidDevice;
     #[cfg(all(libusb, not(target_os = "freebsd")))]
     pub fn libusb_set_option(ctx: *mut LibusbContext, option: c_int);
+    pub fn hid_send_output_report(
+        device: *mut HidDevice,
+        data: *const c_uchar,
+        length: size_t,
+    ) -> c_int;
     pub fn hid_write(device: *mut HidDevice, data: *const c_uchar, length: size_t) -> c_int;
     pub fn hid_read_timeout(
         device: *mut HidDevice,

src/lib.rs

@@ -472,6 +472,7 @@ trait HidDeviceBackendBase {
     #[cfg(hidapi)]
     fn check_error(&self) -> HidResult<HidError>;
     fn write(&self, data: &[u8]) -> HidResult<usize>;
+    fn send_output_report(&self, data: &[u8]) -> HidResult<usize>;
     fn read(&self, buf: &mut [u8]) -> HidResult<usize>;
     fn read_timeout(&self, buf: &mut [u8], timeout: i32) -> HidResult<usize>;
     fn send_feature_report(&self, data: &[u8]) -> HidResult<()>;
@@ -541,6 +542,21 @@ impl HidDevice {
         self.inner.write(data)
     }
 
+    // Output reports are sent over the Control endpoint as a Set_Report
+    // transfer. The first byte of data[] must contain the Report ID.
+    // For devices which only support a single report, this must be set
+    // to 0x0. The remaining bytes contain the report data. Since the
+    // Report ID is mandatory, calls to hid_send_output_report() will
+    // always contain one more byte than the report contains. For example,
+    //  if a hid report is 16 bytes long, 17 bytes must be passed to
+    //  hid_send_output_report(): the Report ID (or 0x0, for devices
+    // which do not use numbered reports), followed by the report
+    // data (16 bytes). In this example, the length passed in
+    // would be 17.
+    pub fn send_output_report(&self, data: &[u8]) -> HidResult<usize> {
+        self.inner.send_output_report(data)
+    }
+
     /// Read an Input report from a HID device.
     ///
     /// Input reports are returned to the host through the 'INTERRUPT IN'