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 struct 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
  70 extern const struct consw *conswitchp;
  71
  72 extern const struct consw dummy_con;    /* dummy console buffer */
  73 extern const struct consw vga_con;      /* VGA text console */
  74 extern const struct consw newport_con;  /* SGI Newport console  */
  75 extern const struct consw prom_con;     /* SPARC PROM console */
  76
  77 int con_is_bound(const struct consw *csw);
  78 int register_con_driver(const struct consw *csw, int first, int last);
  79 int unregister_con_driver(const struct consw *csw);
  80 int take_over_console(const struct consw *sw, int first, int last, int deflt);
  81 void give_up_console(const struct consw *sw);
  82 #ifdef CONFIG_HW_CONSOLE
  83 int con_debug_enter(struct vc_data *vc);
  84 int con_debug_leave(void);
  85 #else
  86 static inline int con_debug_enter(struct vc_data *vc)
  87 {
  88         return 0;
  89 }
  90 static inline int con_debug_leave(void)
  91 {
  92         return 0;
  93 }
  94 #endif
  95
  96 /* scroll */
  97 #define SM_UP       (1)
  98 #define SM_DOWN     (2)
  99
 100 /* cursor */
 101 #define CM_DRAW     (1)
 102 #define CM_ERASE    (2)
 103 #define CM_MOVE     (3)
 104
 105 /*
 106  * The interface for a console, or any other device that wants to capture
 107  * console messages (printer driver?)
 108  *
 109  * If a console driver is marked CON_BOOT then it will be auto-unregistered
 110  * when the first real console is registered.  This is for early-printk drivers.
 111  */
 112
 113 #define CON_PRINTBUFFER (1)
 114 #define CON_CONSDEV     (2) /* Last on the command line */
 115 #define CON_ENABLED     (4)
 116 #define CON_BOOT        (8)
 117 #define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
 118 #define CON_BRL         (32) /* Used for a braille device */
 119
 120 struct console {
 121         char    name[16];
 122         void    (*write)(struct console *, const char *, unsigned);
 123         int     (*read)(struct console *, char *, unsigned);
 124         struct tty_driver *(*device)(struct console *, int *);
 125         void    (*unblank)(void);
 126         int     (*setup)(struct console *, char *);
 127         int     (*early_setup)(void);
 128         short   flags;
 129         short   index;
 130         int     cflag;
 131         void    *data;
 132         struct   console *next;
 133 };
 134
 135 /*
 136  * for_each_console() allows you to iterate on each console
 137  */
 138 #define for_each_console(con) \
 139         for (con = console_drivers; con != NULL; con = con->next)
 140
 141 extern int console_set_on_cmdline;
 142
 143 extern int add_preferred_console(char *name, int idx, char *options);
 144 extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);
 145 extern void register_console(struct console *);
 146 extern int unregister_console(struct console *);
 147 extern struct console *console_drivers;
 148 extern void console_lock(void);
 149 extern int console_trylock(void);
 150 extern void console_unlock(void);
 151 extern void console_conditional_schedule(void);
 152 extern void console_unblank(void);
 153 extern struct tty_driver *console_device(int *);
 154 extern void console_stop(struct console *);
 155 extern void console_start(struct console *);
 156 extern int is_console_locked(void);
 157 extern int braille_register_console(struct console *, int index,
 158                 char *console_options, char *braille_options);
 159 extern int braille_unregister_console(struct console *);
 160 #ifdef CONFIG_TTY
 161 extern void console_sysfs_notify(void);
 162 #else
 163 static inline void console_sysfs_notify(void)
 164 { }
 165 #endif
 166 extern bool console_suspend_enabled;
 167
 168 /* Suspend and resume console messages over PM events */
 169 extern void suspend_console(void);
 170 extern void resume_console(void);
 171
 172 int mda_console_init(void);
 173 void prom_con_init(void);
 174
 175 void vcs_make_sysfs(int index);
 176 void vcs_remove_sysfs(int index);
 177
 178 /* Some debug stub to catch some of the obvious races in the VT code */
 179 #if 1
 180 #define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
 181 #else
 182 #define WARN_CONSOLE_UNLOCKED()
 183 #endif
 184
 185 /* VESA Blanking Levels */
 186 #define VESA_NO_BLANKING        0
 187 #define VESA_VSYNC_SUSPEND      1
 188 #define VESA_HSYNC_SUSPEND      2
 189 #define VESA_POWERDOWN          3
 190
 191 #ifdef CONFIG_VGA_CONSOLE
 192 extern bool vgacon_text_force(void);
 193 #endif
 194
 195 #endif /* _LINUX_CONSOLE_H */