1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/drivers/video/console/dummycon.c b/kernel/drivers/video/console/dummycon.c
new file mode 100644
index 000000000..0efc52f11
--- /dev/null
+++ b/kernel/drivers/video/console/dummycon.c
@@ -0,0 +1,77 @@
+/*
+ *  linux/drivers/video/dummycon.c -- A dummy console driver
+ *
+ *  To be used if there's no other console driver (e.g. for plain VGA text)
+ *  available, usually until fbcon takes console over.
+ */
+
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/vt_kern.h>
+#include <linux/screen_info.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+/*
+ *  Dummy console driver
+ */
+
+#if defined(__arm__)
+#define DUMMY_COLUMNS	screen_info.orig_video_cols
+#define DUMMY_ROWS	screen_info.orig_video_lines
+#else
+/* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */
+#define DUMMY_COLUMNS	CONFIG_DUMMY_CONSOLE_COLUMNS
+#define DUMMY_ROWS	CONFIG_DUMMY_CONSOLE_ROWS
+#endif
+
+static const char *dummycon_startup(void)
+{
+    return "dummy device";
+}
+
+static void dummycon_init(struct vc_data *vc, int init)
+{
+    vc->vc_can_do_color = 1;
+    if (init) {
+	vc->vc_cols = DUMMY_COLUMNS;
+	vc->vc_rows = DUMMY_ROWS;
+    } else
+	vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS);
+}
+
+static int dummycon_dummy(void)
+{
+    return 0;
+}
+
+#define DUMMY	(void *)dummycon_dummy
+
+/*
+ *  The console `switch' structure for the dummy console
+ *
+ *  Most of the operations are dummies.
+ */
+
+const struct consw dummy_con = {
+    .owner =		THIS_MODULE,
+    .con_startup =	dummycon_startup,
+    .con_init =		dummycon_init,
+    .con_deinit =	DUMMY,
+    .con_clear =	DUMMY,
+    .con_putc =		DUMMY,
+    .con_putcs =	DUMMY,
+    .con_cursor =	DUMMY,
+    .con_scroll =	DUMMY,
+    .con_bmove =	DUMMY,
+    .con_switch =	DUMMY,
+    .con_blank =	DUMMY,
+    .con_font_set =	DUMMY,
+    .con_font_get =	DUMMY,
+    .con_font_default =	DUMMY,
+    .con_font_copy =	DUMMY,
+    .con_set_palette =	DUMMY,
+    .con_scrolldelta =	DUMMY,
+};
+EXPORT_SYMBOL_GPL(dummy_con);