linux: Parse kind from Class if Appearance is not available

Not all headsets have a GAP profile revealing their appearance, but they
do have a class.

1 files changed, 94 insertions, 0 deletions

diff --git a/src/linux/up-device-bluez.c b/src/linux/up-device-bluez.c
index f4480ba..2234b83 100644
--- a/src/linux/up-device-bluez.c
+++ b/src/linux/up-device-bluez.c
@@ -63,6 +63,94 @@ appearance_to_kind (guint16 appearance)
 }
 
 /**
+ * class_to_kind:
+ * @class: a Bluetooth device class
+ *
+ * Returns value: the type of device corresponding to the given @class value.
+ **/
+static UpDeviceKind
+class_to_kind (guint32 class)
+{
+	/*
+	 * See Bluetooth Assigned Numbers for Baseband
+	 * https://www.bluetooth.com/specifications/assigned-numbers/baseband/
+	 */
+
+	switch ((class & 0x1f00) >> 8) {
+	case 0x01:
+		return UP_DEVICE_KIND_COMPUTER;
+	case 0x02:
+		switch ((class & 0xfc) >> 2) {
+		case 0x01:
+		case 0x02:
+		case 0x03:
+		case 0x05:
+			return UP_DEVICE_KIND_PHONE;
+		case 0x04:
+			return UP_DEVICE_KIND_MODEM;
+		}
+		break;
+	case 0x03:
+		return UP_DEVICE_KIND_NETWORK;
+	case 0x04:
+		switch ((class & 0xfc) >> 2) {
+		case 0x01:
+		case 0x02:
+			return UP_DEVICE_KIND_HEADSET;
+		case 0x05:
+			return UP_DEVICE_KIND_SPEAKERS;
+		case 0x06:
+			return UP_DEVICE_KIND_HEADPHONES;
+		case 0x0b: /* VCR */
+		case 0x0c: /* Video Camera */
+		case 0x0d: /* Camcorder */
+			return UP_DEVICE_KIND_VIDEO;
+		default:
+			return UP_DEVICE_KIND_OTHER_AUDIO;
+		}
+		break;
+	case 0x05:
+		switch ((class & 0xc0) >> 6) {
+		case 0x00:
+			switch ((class & 0x1e) >> 2) {
+			case 0x01:
+			case 0x02:
+				return UP_DEVICE_KIND_GAMING_INPUT;
+			case 0x03:
+				return UP_DEVICE_KIND_REMOTE_CONTROL;
+			}
+			break;
+		case 0x01:
+			return UP_DEVICE_KIND_KEYBOARD;
+		case 0x02:
+			switch ((class & 0x1e) >> 2) {
+			case 0x05:
+				return UP_DEVICE_KIND_TABLET;
+			default:
+				return UP_DEVICE_KIND_MOUSE;
+			}
+		}
+		break;
+	case 0x06:
+		if (class & 0x80)
+			return UP_DEVICE_KIND_PRINTER;
+		if (class & 0x40)
+			return UP_DEVICE_KIND_SCANNER;
+		if (class & 0x20)
+			return UP_DEVICE_KIND_CAMERA;
+		if (class & 0x10)
+			return UP_DEVICE_KIND_MONITOR;
+		break;
+	case 0x07:
+		return UP_DEVICE_KIND_WEARABLE;
+	case 0x08:
+		return UP_DEVICE_KIND_TOY;
+	}
+
+	return UP_DEVICE_KIND_UNKNOWN;
+}
+
+/**
  * up_device_bluez_coldplug:
  *
  * Return %TRUE on success, %FALSE if we failed to get data and should be removed
@@ -103,6 +191,12 @@ up_device_bluez_coldplug (UpDevice *device)
 		appearance = g_variant_get_uint16 (v);
 		kind = appearance_to_kind (appearance);
 		g_variant_unref (v);
+	} else if ((v = g_dbus_proxy_get_cached_property (proxy, "Class"))) {
+		guint32 class;
+
+		class = g_variant_get_uint32 (v);
+		kind = class_to_kind (class);
+		g_variant_unref (v);
 	} else {
 		kind = UP_DEVICE_KIND_UNKNOWN;
 	}