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 #include <linux/spinlock.h>
  19
  20 struct vc_data;
  21 struct console_font_op;
  22 struct console_font;
  23 struct module;
  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         int     (*con_set_palette)(struct vc_data *, unsigned char *);
  50         int     (*con_scrolldelta)(struct vc_data *, int);
  51         int     (*con_set_origin)(struct vc_data *);
  52         void    (*con_save_screen)(struct vc_data *);
  53         u8      (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8);
  54         void    (*con_invert_region)(struct vc_data *, u16 *, int);
  55         u16    *(*con_screen_pos)(struct vc_data *, int);
  56         unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
  57 };
  58
  59 extern const struct consw *conswitchp;
  60
  61 extern const struct consw dummy_con;    /* dummy console buffer */
  62 extern const struct consw vga_con;      /* VGA text console */
  63 extern const struct consw newport_con;  /* SGI Newport console  */
  64 extern const struct consw prom_con;     /* SPARC PROM console */
  65
  66 int con_is_bound(const struct consw *csw);
  67 int register_con_driver(const struct consw *csw, int first, int last);
  68 int unregister_con_driver(const struct consw *csw);
  69 int take_over_console(const struct consw *sw, int first, int last, int deflt);
  70 void give_up_console(const struct consw *sw);
  71 /* scroll */
  72 #define SM_UP       (1)
  73 #define SM_DOWN     (2)
  74
  75 /* cursor */
  76 #define CM_DRAW     (1)
  77 #define CM_ERASE    (2)
  78 #define CM_MOVE     (3)
  79
  80 /*
  81  * The interface for a console, or any other device that wants to capture
  82  * console messages (printer driver?)
  83  *
  84  * If a console driver is marked CON_BOOT then it will be auto-unregistered
  85  * when the first real console is registered.  This is for early-printk drivers.
  86  */
  87
  88 #define CON_PRINTBUFFER (1)
  89 #define CON_CONSDEV     (2) /* Last on the command line */
  90 #define CON_ENABLED     (4)
  91 #define CON_BOOT        (8)
  92 #define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
  93
  94 struct console
  95 {
  96         char    name[8];
  97         void    (*write)(struct console *, const char *, unsigned);
  98         int     (*read)(struct console *, char *, unsigned);
  99         struct tty_driver *(*device)(struct console *, int *);
 100         void    (*unblank)(void);
 101         int     (*setup)(struct console *, char *);
 102         short   flags;
 103         short   index;
 104         int     cflag;
 105         void    *data;
 106         struct   console *next;
 107 };
 108
 109 extern int add_preferred_console(char *name, int idx, char *options);
 110 extern void register_console(struct console *);
 111 extern int unregister_console(struct console *);
 112 extern struct console *console_drivers;
 113 extern void acquire_console_sem(void);
 114 extern int try_acquire_console_sem(void);
 115 extern void release_console_sem(void);
 116 extern void console_conditional_schedule(void);
 117 extern void console_unblank(void);
 118 extern struct tty_driver *console_device(int *);
 119 extern void console_stop(struct console *);
 120 extern void console_start(struct console *);
 121 extern int is_console_locked(void);
 122
 123 #ifndef CONFIG_DISABLE_CONSOLE_SUSPEND
 124 /* Suspend and resume console messages over PM events */
 125 extern void suspend_console(void);
 126 extern void resume_console(void);
 127 #else
 128 static inline void suspend_console(void) {}
 129 static inline void resume_console(void) {}
 130 #endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */
 131
 132 /* Some debug stub to catch some of the obvious races in the VT code */
 133 #if 1
 134 #define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
 135 #else
 136 #define WARN_CONSOLE_UNLOCKED()
 137 #endif
 138
 139 /* VESA Blanking Levels */
 140 #define VESA_NO_BLANKING        0
 141 #define VESA_VSYNC_SUSPEND      1
 142 #define VESA_HSYNC_SUSPEND      2
 143 #define VESA_POWERDOWN          3
 144
 145 #endif /* _LINUX_CONSOLE_H */