drivers/char/hvc_console.h

   1 /*
   2  * hvc_console.h
   3  * Copyright (C) 2005 IBM Corporation
   4  *
   5  * Author(s):
   6  *      Ryan S. Arnold <rsa@us.ibm.com>
   7  *
   8  * hvc_console header information:
   9  *      moved here from include/asm-powerpc/hvconsole.h
  10  *      and drivers/char/hvc_console.c
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  25  */
  26
  27 #ifndef HVC_CONSOLE_H
  28 #define HVC_CONSOLE_H
  29
  30 /*
  31  * This is the max number of console adapters that can/will be found as
  32  * console devices on first stage console init.  Any number beyond this range
  33  * can't be used as a console device but is still a valid tty device.
  34  */
  35 #define MAX_NR_HVC_CONSOLES     16
  36
  37 /*
  38  * The Linux TTY code does not support dynamic addition of tty derived devices
  39  * so we need to know how many tty devices we might need when space is allocated
  40  * for the tty device.  Since this driver supports hotplug of vty adapters we
  41  * need to make sure we have enough allocated.
  42  */
  43 #define HVC_ALLOC_TTY_ADAPTERS  8
  44
  45
  46 /* implemented by a low level driver */
  47 struct hv_ops {
  48         int (*get_chars)(uint32_t vtermno, char *buf, int count);
  49         int (*put_chars)(uint32_t vtermno, const char *buf, int count);
  50 };
  51
  52 struct hvc_struct;
  53
  54 /* Register a vterm and a slot index for use as a console (console_init) */
  55 extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
  56
  57 /* register a vterm for hvc tty operation (module_init or hotplug add) */
  58 extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
  59                                                  struct hv_ops *ops);
  60 /* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
  61 extern int __devexit hvc_remove(struct hvc_struct *hp);
  62
  63 #endif // HVC_CONSOLE_H