video: Provide a signal when a new console line is started
When we start a new line (due to the user pressing return), signal this to
the driver so that it can flush its buffer of character positions.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/video_console.h b/include/video_console.h
index cbbf134..36c4e13 100644
--- a/include/video_console.h
+++ b/include/video_console.h
@@ -28,6 +28,7 @@
* @tab_width_frac: Tab width in fractional units
* @xsize_frac: Width of the display in fractional units
* @xstart_frac: Left margin for the text console in fractional units
+ * @last_ch: Last character written to the text console on this line
*/
struct vidconsole_priv {
struct stdio_dev sdev;
@@ -40,6 +41,7 @@
int tab_width_frac;
int xsize_frac;
int xstart_frac;
+ int last_ch;
};
/**
@@ -87,6 +89,18 @@
* @return 0 if OK, -ve on error
*/
int (*set_row)(struct udevice *dev, uint row, int clr);
+
+ /**
+ * entry_start() - Indicate that text entry is starting afresh
+ *
+ * Consoles which use proportional fonts need to track the position of
+ * each character output so that backspace will return to the correct
+ * place. This method signals to the console driver that a new entry
+ * line is being start (e.g. the user pressed return to start a new
+ * command). The driver can use this signal to empty its list of
+ * positions.
+ */
+ int (*entry_start)(struct udevice *dev);
};
/* Get a pointer to the driver operations for a video console device */