video: Provide a backspace method
With proportional fonts the vidconsole uclass cannot itself erase the
previous character. Provide an optional method so that the driver can
handle this operation.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/vidconsole-uclass.c b/drivers/video/vidconsole-uclass.c
index bea563a..f6326b6 100644
--- a/drivers/video/vidconsole-uclass.c
+++ b/drivers/video/vidconsole-uclass.c
@@ -57,9 +57,17 @@
}
/* Move backwards one space */
-static void vidconsole_back(struct udevice *dev)
+static int vidconsole_back(struct udevice *dev)
{
struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
+ struct vidconsole_ops *ops = vidconsole_get_ops(dev);
+ int ret;
+
+ if (ops->backspace) {
+ ret = ops->backspace(dev);
+ if (ret != -ENOSYS)
+ return ret;
+ }
priv->xcur_frac -= VID_TO_POS(priv->x_charsize);
if (priv->xcur_frac < priv->xstart_frac) {
@@ -69,6 +77,8 @@
if (priv->ycur < 0)
priv->ycur = 0;
}
+
+ return 0;
}
/* Move to a newline, scrolling the display if necessary */