/* * 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 #elif defined(__hppa__) /* 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 #else #define DUMMY_COLUMNS 80 #define DUMMY_ROWS 25 #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, };