75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
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/*
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* linux/drivers/video/dummycon.c -- A dummy console driver
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*
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* To be used if there's no other console driver (e.g. for plain VGA text)
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* available, usually until fbcon takes console over.
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*/
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/console.h>
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#include <linux/vt_kern.h>
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#include <linux/screen_info.h>
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#include <linux/init.h>
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#include <linux/module.h>
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/*
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* Dummy console driver
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*/
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#if defined(__arm__)
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#define DUMMY_COLUMNS screen_info.orig_video_cols
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#define DUMMY_ROWS screen_info.orig_video_lines
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#else
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/* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */
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#define DUMMY_COLUMNS CONFIG_DUMMY_CONSOLE_COLUMNS
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#define DUMMY_ROWS CONFIG_DUMMY_CONSOLE_ROWS
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#endif
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static const char *dummycon_startup(void)
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{
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return "dummy device";
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}
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static void dummycon_init(struct vc_data *vc, int init)
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{
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vc->vc_can_do_color = 1;
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if (init) {
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vc->vc_cols = DUMMY_COLUMNS;
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vc->vc_rows = DUMMY_ROWS;
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} else
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vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS);
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}
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static int dummycon_dummy(void)
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{
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return 0;
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}
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#define DUMMY (void *)dummycon_dummy
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/*
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* The console `switch' structure for the dummy console
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*
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* Most of the operations are dummies.
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*/
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const struct consw dummy_con = {
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.owner = THIS_MODULE,
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.con_startup = dummycon_startup,
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.con_init = dummycon_init,
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.con_deinit = DUMMY,
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.con_clear = DUMMY,
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.con_putc = DUMMY,
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.con_putcs = DUMMY,
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.con_cursor = DUMMY,
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.con_scroll = DUMMY,
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.con_switch = DUMMY,
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.con_blank = DUMMY,
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.con_font_set = DUMMY,
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.con_font_get = DUMMY,
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.con_font_default = DUMMY,
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.con_font_copy = DUMMY,
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};
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EXPORT_SYMBOL_GPL(dummy_con);
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