include/linux/console.h

   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
  19 struct vc_data;
  20 struct console_font_op;
  21 struct console_font;
  22 struct module;
  23 struct 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
  31 enum con_scroll {
  32         SM_UP,
  33         SM_DOWN,
  34 };
  35
  36 /**
  37  * struct consw - callbacks for consoles
  38  *
  39  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
  40  *              Return true if no generic handling should be done.
  41  *              Invoked by csi_M and printing to the console.
  42  * @con_set_palette: sets the palette of the console to @table (optional)
  43  * @con_scrolldelta: the contents of the console should be scrolled by @lines.
  44  *                   Invoked by user. (optional)
  45  */
  46 struct consw {
  47         struct module *owner;
  48         const char *(*con_startup)(void);
  49         void    (*con_init)(struct vc_data *, int);
  50         void    (*con_deinit)(struct vc_data *);
  51         void    (*con_clear)(struct vc_data *, int, int, int, int);
  52         void    (*con_putc)(struct vc_data *, int, int, int);
  53         void    (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
  54         void    (*con_cursor)(struct vc_data *, int);
  55         bool    (*con_scroll)(struct vc_data *, unsigned int top,
  56                         unsigned int bottom, enum con_scroll dir,
  57                         unsigned int lines);
  58         int     (*con_switch)(struct vc_data *);
  59         int     (*con_blank)(struct vc_data *, int, int);
  60         int     (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
  61         int     (*con_font_get)(struct vc_data *, struct console_font *);
  62         int     (*con_font_default)(struct vc_data *, struct console_font *, char *);
  63         int     (*con_font_copy)(struct vc_data *, int);
  64         int     (*con_resize)(struct vc_data *, unsigned int, unsigned int,
  65                                unsigned int);
  66         void    (*con_set_palette)(struct vc_data *,
  67                         const unsigned char *table);
  68         void    (*con_scrolldelta)(struct vc_data *, int lines);
  69         int     (*con_set_origin)(struct vc_data *);
  70         void    (*con_save_screen)(struct vc_data *);
  71         u8      (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8, u8);
  72         void    (*con_invert_region)(struct vc_data *, u16 *, int);
  73         u16    *(*con_screen_pos)(struct vc_data *, int);
  74         unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
  75         /*
  76          * Flush the video console driver's scrollback buffer
  77          */
  78         void    (*con_flush_scrollback)(struct vc_data *);
  79         /*
  80          * Prepare the console for the debugger.  This includes, but is not
  81          * limited to, unblanking the console, loading an appropriate
  82          * palette, and allowing debugger generated output.
  83          */
  84         int     (*con_debug_enter)(struct vc_data *);
  85         /*
  86          * Restore the console to its pre-debug state as closely as possible.
  87          */
  88         int     (*con_debug_leave)(struct vc_data *);
  89 };
  90
  91 extern const struct consw *conswitchp;
  92
  93 extern const struct consw dummy_con;    /* dummy console buffer */
  94 extern const struct consw vga_con;      /* VGA text console */
  95 extern const struct consw newport_con;  /* SGI Newport console  */
  96 extern const struct consw prom_con;     /* SPARC PROM console */
  97
  98 int con_is_bound(const struct consw *csw);
  99 int do_unregister_con_driver(const struct consw *csw);
 100 int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
 101 void give_up_console(const struct consw *sw);
 102 #ifdef CONFIG_HW_CONSOLE
 103 int con_debug_enter(struct vc_data *vc);
 104 int con_debug_leave(void);
 105 #else
 106 static inline int con_debug_enter(struct vc_data *vc)
 107 {
 108         return 0;
 109 }
 110 static inline int con_debug_leave(void)
 111 {
 112         return 0;
 113 }
 114 #endif
 115
 116 /* cursor */
 117 #define CM_DRAW     (1)
 118 #define CM_ERASE    (2)
 119 #define CM_MOVE     (3)
 120
 121 /*
 122  * The interface for a console, or any other device that wants to capture
 123  * console messages (printer driver?)
 124  *
 125  * If a console driver is marked CON_BOOT then it will be auto-unregistered
 126  * when the first real console is registered.  This is for early-printk drivers.
 127  */
 128
 129 #define CON_PRINTBUFFER (1)
 130 #define CON_CONSDEV     (2) /* Last on the command line */
 131 #define CON_ENABLED     (4)
 132 #define CON_BOOT        (8)
 133 #define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
 134 #define CON_BRL         (32) /* Used for a braille device */
 135 #define CON_EXTENDED    (64) /* Use the extended output format a la /dev/kmsg */
 136
 137 struct console {
 138         char    name[16];
 139         void    (*write)(struct console *, const char *, unsigned);
 140         int     (*read)(struct console *, char *, unsigned);
 141         struct tty_driver *(*device)(struct console *, int *);
 142         void    (*unblank)(void);
 143         int     (*setup)(struct console *, char *);
 144         int     (*match)(struct console *, char *name, int idx, char *options);
 145         short   flags;
 146         short   index;
 147         int     cflag;
 148         void    *data;
 149         struct   console *next;
 150 };
 151
 152 /*
 153  * for_each_console() allows you to iterate on each console
 154  */
 155 #define for_each_console(con) \
 156         for (con = console_drivers; con != NULL; con = con->next)
 157
 158 extern int console_set_on_cmdline;
 159 extern struct console *early_console;
 160
 161 extern int add_preferred_console(char *name, int idx, char *options);
 162 extern void register_console(struct console *);
 163 extern int unregister_console(struct console *);
 164 extern struct console *console_drivers;
 165 extern void console_lock(void);
 166 extern int console_trylock(void);
 167 extern void console_unlock(void);
 168 extern void console_conditional_schedule(void);
 169 extern void console_unblank(void);
 170 extern void console_flush_on_panic(void);
 171 extern struct tty_driver *console_device(int *);
 172 extern void console_stop(struct console *);
 173 extern void console_start(struct console *);
 174 extern int is_console_locked(void);
 175 extern int braille_register_console(struct console *, int index,
 176                 char *console_options, char *braille_options);
 177 extern int braille_unregister_console(struct console *);
 178 #ifdef CONFIG_TTY
 179 extern void console_sysfs_notify(void);
 180 #else
 181 static inline void console_sysfs_notify(void)
 182 { }
 183 #endif
 184 extern bool console_suspend_enabled;
 185
 186 /* Suspend and resume console messages over PM events */
 187 extern void suspend_console(void);
 188 extern void resume_console(void);
 189
 190 int mda_console_init(void);
 191 void prom_con_init(void);
 192
 193 void vcs_make_sysfs(int index);
 194 void vcs_remove_sysfs(int index);
 195
 196 /* Some debug stub to catch some of the obvious races in the VT code */
 197 #if 1
 198 #define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
 199 #else
 200 #define WARN_CONSOLE_UNLOCKED()
 201 #endif
 202
 203 /* VESA Blanking Levels */
 204 #define VESA_NO_BLANKING        0
 205 #define VESA_VSYNC_SUSPEND      1
 206 #define VESA_HSYNC_SUSPEND      2
 207 #define VESA_POWERDOWN          3
 208
 209 #ifdef CONFIG_VGA_CONSOLE
 210 extern bool vgacon_text_force(void);
 211 #else
 212 static inline bool vgacon_text_force(void) { return false; }
 213 #endif
 214
 215 extern void console_init(void);
 216
 217 #endif /* _LINUX_CONSOLE_H */