summaryrefslogtreecommitdiff
path: root/drivers/video/console/dummycon.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/console/dummycon.c')
-rw-r--r--drivers/video/console/dummycon.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
new file mode 100644
index 000000000..0efc52f11
--- /dev/null
+++ b/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);