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/tty.h> 11 #include <linux/console.h> 12 #include <linux/vt_kern.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 ORIG_VIDEO_COLS 22 #define DUMMY_ROWS ORIG_VIDEO_LINES 23 #elif defined(__hppa__) 24 /* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */ 25 #include <linux/config.h> 26 #define DUMMY_COLUMNS CONFIG_DUMMY_CONSOLE_COLUMNS 27 #define DUMMY_ROWS CONFIG_DUMMY_CONSOLE_ROWS 28 #else 29 #define DUMMY_COLUMNS 80 30 #define DUMMY_ROWS 25 31 #endif 32 33 static const char *dummycon_startup(void) 34 { 35 return "dummy device"; 36 } 37 38 static void dummycon_init(struct vc_data *vc, int init) 39 { 40 vc->vc_can_do_color = 1; 41 if (init) { 42 vc->vc_cols = DUMMY_COLUMNS; 43 vc->vc_rows = DUMMY_ROWS; 44 } else 45 vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS); 46 } 47 48 static int dummycon_dummy(void) 49 { 50 return 0; 51 } 52 53 #define DUMMY (void *)dummycon_dummy 54 55 /* 56 * The console `switch' structure for the dummy console 57 * 58 * Most of the operations are dummies. 59 */ 60 61 const struct consw dummy_con = { 62 .owner = THIS_MODULE, 63 .con_startup = dummycon_startup, 64 .con_init = dummycon_init, 65 .con_deinit = DUMMY, 66 .con_clear = DUMMY, 67 .con_putc = DUMMY, 68 .con_putcs = DUMMY, 69 .con_cursor = DUMMY, 70 .con_scroll = DUMMY, 71 .con_bmove = DUMMY, 72 .con_switch = DUMMY, 73 .con_blank = DUMMY, 74 .con_font_set = DUMMY, 75 .con_font_get = DUMMY, 76 .con_font_default = DUMMY, 77 .con_font_copy = DUMMY, 78 .con_set_palette = DUMMY, 79 .con_scrolldelta = DUMMY, 80 }; 81