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 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#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 32static const char *dummycon_startup(void) 33{ 34 return "dummy device"; 35} 36 37static 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 47static 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 60const 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