linux/hidraw: Add support for BUS_VIRTUAL (#745)

This driver implements support of a virtual HID device on linux:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/platform/x86/tuxedo/nb04/wmi_ab.c?id=cfd84b3f419bf0aec60ecddc92c61b539c339ec9#n841

Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>

Author: tuxedo-wse

hidapi/hidapi.h

@@ -144,6 +144,13 @@ extern "C" {
 			   Specifications:
 			   https://www.microsoft.com/download/details.aspx?id=103325 */
 			HID_API_BUS_SPI = 0x04,
+
+			/** Virtual device
+			    E.g.: https://elixir.bootlin.com/linux/v4.0/source/include/uapi/linux/input.h#L955 
+			    
+			    Since version 0.16.0, @ref HID_API_VERSION >= HID_API_MAKE_VERSION(0, 16, 0)
+			*/
+			HID_API_BUS_VIRTUAL = 0x05,
 		} hid_bus_type;
 
 		/** hidapi info structure */

linux/hid.c

@@ -683,6 +683,7 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 		case BUS_I2C:
 		case BUS_USB:
 		case BUS_SPI:
+		case BUS_VIRTUAL:
 			break;
 
 		default:
@@ -779,6 +780,14 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 
 			break;
 
+		case BUS_VIRTUAL:
+			cur_dev->manufacturer_string = wcsdup(L"");
+			cur_dev->product_string = utf8_to_wchar_t(product_name_utf8);
+
+			cur_dev->bus_type = HID_API_BUS_VIRTUAL;
+
+			break;
+
 		default:
 			/* Unknown device type - this should never happen, as we
 			 * check for USB and Bluetooth devices above */

windows/hid.c

@@ -804,6 +804,7 @@ static struct hid_device_info *hid_internal_get_device_info(const wchar_t *path,
 	case HID_API_BUS_UNKNOWN:
 	case HID_API_BUS_SPI:
 	case HID_API_BUS_I2C:
+	case HID_API_BUS_VIRTUAL:
 		/* shut down -Wswitch */
 		break;
 	}