linux/include/linux/console.h
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   1/*
   2 *  linux/include/linux/console.h
   3 *
   4 *  Copyright (C) 1993        Hamish Macdonald
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file COPYING in the main directory of this archive
   8 * for more details.
   9 *
  10 * Changed:
  11 * 10-Mar-94: Arno Griffioen: Conversion for vt100 emulator port from PC LINUX
  12 */
  13
  14#ifndef _LINUX_CONSOLE_H_
  15#define _LINUX_CONSOLE_H_ 1
  16
  17#include <linux/types.h>
  18
  19struct vc_data;
  20struct console_font_op;
  21struct console_font;
  22struct module;
  23struct tty_struct;
  24
  25/*
  26 * this is what the terminal answers to a ESC-Z or csi0c query.
  27 */
  28#define VT100ID "\033[?1;2c"
  29#define VT102ID "\033[?6c"
  30
  31struct consw {
  32        struct module *owner;
  33        const char *(*con_startup)(void);
  34        void    (*con_init)(struct vc_data *, int);
  35        void    (*con_deinit)(struct vc_data *);
  36        void    (*con_clear)(struct vc_data *, int, int, int, int);
  37        void    (*con_putc)(struct vc_data *, int, int, int);
  38        void    (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
  39        void    (*con_cursor)(struct vc_data *, int);
  40        int     (*con_scroll)(struct vc_data *, int, int, int, int);
  41        void    (*con_bmove)(struct vc_data *, int, int, int, int, int, int);
  42        int     (*con_switch)(struct vc_data *);
  43        int     (*con_blank)(struct vc_data *, int, int);
  44        int     (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
  45        int     (*con_font_get)(struct vc_data *, struct console_font *);
  46        int     (*con_font_default)(struct vc_data *, struct console_font *, char *);
  47        int     (*con_font_copy)(struct vc_data *, int);
  48        int     (*con_resize)(struct vc_data *, unsigned int, unsigned int,
  49                               unsigned int);
  50        int     (*con_set_palette)(struct vc_data *, unsigned char *);
  51        int     (*con_scrolldelta)(struct vc_data *, int);
  52        int     (*con_set_origin)(struct vc_data *);
  53        void    (*con_save_screen)(struct vc_data *);
  54        u8      (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8, u8);
  55        void    (*con_invert_region)(struct vc_data *, u16 *, int);
  56        u16    *(*con_screen_pos)(struct vc_data *, int);
  57        unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
  58        /*
  59         * Prepare the console for the debugger.  This includes, but is not
  60         * limited to, unblanking the console, loading an appropriate
  61         * palette, and allowing debugger generated output.
  62         */
  63        int     (*con_debug_enter)(struct vc_data *);
  64        /*
  65         * Restore the console to its pre-debug state as closely as possible.
  66         */
  67        int     (*con_debug_leave)(struct vc_data *);
  68};
  69
  70extern const struct consw *conswitchp;
  71
  72extern const struct consw dummy_con;    /* dummy console buffer */
  73extern const struct consw vga_con;      /* VGA text console */
  74extern const struct consw newport_con;  /* SGI Newport console  */
  75extern const struct consw prom_con;     /* SPARC PROM console */
  76
  77int con_is_bound(const struct consw *csw);
  78int register_con_driver(const struct consw *csw, int first, int last);
  79int unregister_con_driver(const struct consw *csw);
  80int do_unregister_con_driver(const struct consw *csw);
  81int take_over_console(const struct consw *sw, int first, int last, int deflt);
  82int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
  83void give_up_console(const struct consw *sw);
  84#ifdef CONFIG_HW_CONSOLE
  85int con_debug_enter(struct vc_data *vc);
  86int con_debug_leave(void);
  87#else
  88static inline int con_debug_enter(struct vc_data *vc)
  89{
  90        return 0;
  91}
  92static inline int con_debug_leave(void)
  93{
  94        return 0;
  95}
  96#endif
  97
  98/* scroll */
  99#define SM_UP       (1)
 100#define SM_DOWN     (2)
 101
 102/* cursor */
 103#define CM_DRAW     (1)
 104#define CM_ERASE    (2)
 105#define CM_MOVE     (3)
 106
 107/*
 108 * The interface for a console, or any other device that wants to capture
 109 * console messages (printer driver?)
 110 *
 111 * If a console driver is marked CON_BOOT then it will be auto-unregistered
 112 * when the first real console is registered.  This is for early-printk drivers.
 113 */
 114
 115#define CON_PRINTBUFFER (1)
 116#define CON_CONSDEV     (2) /* Last on the command line */
 117#define CON_ENABLED     (4)
 118#define CON_BOOT        (8)
 119#define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
 120#define CON_BRL         (32) /* Used for a braille device */
 121
 122struct console {
 123        char    name[16];
 124        void    (*write)(struct console *, const char *, unsigned);
 125        int     (*read)(struct console *, char *, unsigned);
 126        struct tty_driver *(*device)(struct console *, int *);
 127        void    (*unblank)(void);
 128        int     (*setup)(struct console *, char *);
 129        int     (*early_setup)(void);
 130        short   flags;
 131        short   index;
 132        int     cflag;
 133        void    *data;
 134        struct   console *next;
 135};
 136
 137/*
 138 * for_each_console() allows you to iterate on each console
 139 */
 140#define for_each_console(con) \
 141        for (con = console_drivers; con != NULL; con = con->next)
 142
 143extern int console_set_on_cmdline;
 144
 145extern int add_preferred_console(char *name, int idx, char *options);
 146extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);
 147extern void register_console(struct console *);
 148extern int unregister_console(struct console *);
 149extern struct console *console_drivers;
 150extern void console_lock(void);
 151extern int console_trylock(void);
 152extern void console_unlock(void);
 153extern void console_conditional_schedule(void);
 154extern void console_unblank(void);
 155extern struct tty_driver *console_device(int *);
 156extern void console_stop(struct console *);
 157extern void console_start(struct console *);
 158extern int is_console_locked(void);
 159extern int braille_register_console(struct console *, int index,
 160                char *console_options, char *braille_options);
 161extern int braille_unregister_console(struct console *);
 162#ifdef CONFIG_TTY
 163extern void console_sysfs_notify(void);
 164#else
 165static inline void console_sysfs_notify(void)
 166{ }
 167#endif
 168extern bool console_suspend_enabled;
 169
 170/* Suspend and resume console messages over PM events */
 171extern void suspend_console(void);
 172extern void resume_console(void);
 173
 174int mda_console_init(void);
 175void prom_con_init(void);
 176
 177void vcs_make_sysfs(int index);
 178void vcs_remove_sysfs(int index);
 179
 180/* Some debug stub to catch some of the obvious races in the VT code */
 181#if 1
 182#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
 183#else
 184#define WARN_CONSOLE_UNLOCKED()
 185#endif
 186
 187/* VESA Blanking Levels */
 188#define VESA_NO_BLANKING        0
 189#define VESA_VSYNC_SUSPEND      1
 190#define VESA_HSYNC_SUSPEND      2
 191#define VESA_POWERDOWN          3
 192
 193#ifdef CONFIG_VGA_CONSOLE
 194extern bool vgacon_text_force(void);
 195#endif
 196
 197#endif /* _LINUX_CONSOLE_H */
 198
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