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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 
 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 do_unregister_con_driver(const struct consw *csw);
 79 int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
 80 void give_up_console(const struct consw *sw);
 81 #ifdef CONFIG_HW_CONSOLE
 82 int con_debug_enter(struct vc_data *vc);
 83 int con_debug_leave(void);
 84 #else
 85 static inline int con_debug_enter(struct vc_data *vc)
 86 {
 87         return 0;
 88 }
 89 static inline int con_debug_leave(void)
 90 {
 91         return 0;
 92 }
 93 #endif
 94 
 95 /* scroll */
 96 #define SM_UP       (1)
 97 #define SM_DOWN     (2)
 98 
 99 /* cursor */
100 #define CM_DRAW     (1)
101 #define CM_ERASE    (2)
102 #define CM_MOVE     (3)
103 
104 /*
105  * The interface for a console, or any other device that wants to capture
106  * console messages (printer driver?)
107  *
108  * If a console driver is marked CON_BOOT then it will be auto-unregistered
109  * when the first real console is registered.  This is for early-printk drivers.
110  */
111 
112 #define CON_PRINTBUFFER (1)
113 #define CON_CONSDEV     (2) /* Last on the command line */
114 #define CON_ENABLED     (4)
115 #define CON_BOOT        (8)
116 #define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
117 #define CON_BRL         (32) /* Used for a braille device */
118 #define CON_EXTENDED    (64) /* Use the extended output format a la /dev/kmsg */
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     (*match)(struct console *, char *name, int idx, char *options);
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 extern struct console *early_console;
143 
144 extern int add_preferred_console(char *name, int idx, 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 void console_flush_on_panic(void);
154 extern struct tty_driver *console_device(int *);
155 extern void console_stop(struct console *);
156 extern void console_start(struct console *);
157 extern int is_console_locked(void);
158 extern int braille_register_console(struct console *, int index,
159                 char *console_options, char *braille_options);
160 extern int braille_unregister_console(struct console *);
161 #ifdef CONFIG_TTY
162 extern void console_sysfs_notify(void);
163 #else
164 static inline void console_sysfs_notify(void)
165 { }
166 #endif
167 extern bool console_suspend_enabled;
168 
169 /* Suspend and resume console messages over PM events */
170 extern void suspend_console(void);
171 extern void resume_console(void);
172 
173 int mda_console_init(void);
174 void prom_con_init(void);
175 
176 void vcs_make_sysfs(int index);
177 void vcs_remove_sysfs(int index);
178 
179 /* Some debug stub to catch some of the obvious races in the VT code */
180 #if 1
181 #define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
182 #else
183 #define WARN_CONSOLE_UNLOCKED()
184 #endif
185 
186 /* VESA Blanking Levels */
187 #define VESA_NO_BLANKING        0
188 #define VESA_VSYNC_SUSPEND      1
189 #define VESA_HSYNC_SUSPEND      2
190 #define VESA_POWERDOWN          3
191 
192 #ifdef CONFIG_VGA_CONSOLE
193 extern bool vgacon_text_force(void);
194 #endif
195 
196 #endif /* _LINUX_CONSOLE_H */
197 

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