1 /*
2 * linux/drivers/video/dummycon.c -- A dummy console driver
3 *
4 * To be used if there's no other console driver (e.g. for plain VGA text)
5 * available, usually until fbcon takes console over.
6 */
7
8 #include <linux/types.h>
9 #include <linux/kdev_t.h>
10 #include <linux/console.h>
11 #include <linux/vt_kern.h>
12 #include <linux/screen_info.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15
16 /*
17 * Dummy console driver
18 */
19
20 #if defined(__arm__)
21 #define DUMMY_COLUMNS screen_info.orig_video_cols
22 #define DUMMY_ROWS screen_info.orig_video_lines
23 #elif defined(__hppa__)
24 /* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */
25 #define DUMMY_COLUMNS CONFIG_DUMMY_CONSOLE_COLUMNS
26 #define DUMMY_ROWS CONFIG_DUMMY_CONSOLE_ROWS
27 #else
28 #define DUMMY_COLUMNS 80
29 #define DUMMY_ROWS 25
30 #endif
31
32 static const char *dummycon_startup(void)
33 {
34 return "dummy device";
35 }
36
37 static void dummycon_init(struct vc_data *vc, int init)
38 {
39 vc->vc_can_do_color = 1;
40 if (init) {
41 vc->vc_cols = DUMMY_COLUMNS;
42 vc->vc_rows = DUMMY_ROWS;
43 } else
44 vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS);
45 }
46
47 static int dummycon_dummy(void)
48 {
49 return 0;
50 }
51
52 #define DUMMY (void *)dummycon_dummy
53
54 /*
55 * The console `switch' structure for the dummy console
56 *
57 * Most of the operations are dummies.
58 */
59
60 const struct consw dummy_con = {
61 .owner = THIS_MODULE,
62 .con_startup = dummycon_startup,
63 .con_init = dummycon_init,
64 .con_deinit = DUMMY,
65 .con_clear = DUMMY,
66 .con_putc = DUMMY,
67 .con_putcs = DUMMY,
68 .con_cursor = DUMMY,
69 .con_scroll = DUMMY,
70 .con_bmove = DUMMY,
71 .con_switch = DUMMY,
72 .con_blank = DUMMY,
73 .con_font_set = DUMMY,
74 .con_font_get = DUMMY,
75 .con_font_default = DUMMY,
76 .con_font_copy = DUMMY,
77 .con_set_palette = DUMMY,
78 .con_scrolldelta = DUMMY,
79 };
80
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