libdfu: Add dfu_context_get_device_by_platform_id()

This lets us get the connection platform ID without exposing the GUsbDevice.

libdfu/dfu-context.c

@@ -509,6 +509,46 @@ dfu_context_get_device_by_vid_pid (DfuContext *context,
 	return g_object_ref (device);
 }
 
+/**
+ * dfu_context_get_device_by_platform_id:
+ * @context: a #DfuContext
+ * @platform_id: a platform ID
+ * @error: a #GError, or %NULL
+ *
+ * Finds a device in the context with a specific platform ID.
+ *
+ * Return value: (transfer full): a #DfuDevice for success, or %NULL for an error
+ *
+ * Since: 0.5.4
+ **/
+DfuDevice *
+dfu_context_get_device_by_platform_id (DfuContext *context,
+				       const gchar *platform_id,
+				       GError **error)
+{
+	DfuContextPrivate *priv = GET_PRIVATE (context);
+	DfuContextItem *item;
+	guint i;
+
+	g_return_val_if_fail (DFU_IS_CONTEXT (context), FALSE);
+	g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+	/* search all devices */
+	for (i = 0; i < priv->devices->len; i++) {
+		item = g_ptr_array_index (priv->devices, i);
+		if (g_strcmp0 (dfu_device_get_platform_id (item->device),
+			       platform_id) == 0) {
+			return g_object_ref (item->device);
+		}
+	}
+	g_set_error (error,
+		     DFU_ERROR,
+		     DFU_ERROR_NOT_FOUND,
+		     "no device matches for %s",
+		     platform_id);
+	return NULL;
+}
+
 /**
  * dfu_context_get_device_default:
  * @context: a #DfuContext

libdfu/dfu-context.h

@@ -65,6 +65,9 @@ DfuDevice	*dfu_context_get_device_by_vid_pid	(DfuContext	*context,
 							 guint16	 vid,
 							 guint16	 pid,
 							 GError		**error);
+DfuDevice	*dfu_context_get_device_by_platform_id	(DfuContext	*context,
+							 const gchar	*platform_id,
+							 GError		**error);
 DfuDevice	*dfu_context_get_device_default		(DfuContext	*context,
 							 GError		**error);
 

libdfu/dfu-device.c

@@ -731,6 +731,24 @@ dfu_device_get_target_by_alt_name (DfuDevice *device,
 	return NULL;
 }
 
+/**
+ * dfu_device_get_platform_id:
+ * @device: a #DfuDevice
+ *
+ * Gets the platform ID which normally corresponds to the port in some way.
+ *
+ * Return value: string or %NULL
+ *
+ * Since: 0.5.4
+ **/
+const gchar *
+dfu_device_get_platform_id (DfuDevice *device)
+{
+	DfuDevicePrivate *priv = GET_PRIVATE (device);
+	g_return_val_if_fail (DFU_IS_DEVICE (device), NULL);
+	return g_usb_device_get_platform_id (priv->dev);
+}
+
 /**
  * dfu_device_get_runtime_vid:
  * @device: a #DfuDevice

libdfu/dfu-device.h

@@ -78,6 +78,7 @@ gboolean	 dfu_device_open			(DfuDevice	*device,
 							 GError		**error);
 gboolean	 dfu_device_close			(DfuDevice	*device,
 							 GError		**error);
+const gchar	*dfu_device_get_platform_id		(DfuDevice	*device);
 GPtrArray	*dfu_device_get_targets			(DfuDevice	*device);
 DfuTarget	*dfu_device_get_target_by_alt_setting	(DfuDevice	*device,
 							 guint8		 alt_setting,