drivers/staging/comedi/drivers/am9513.h

   1 /*
   2     module/am9513.h
   3     value added preprocessor definitions for Am9513 timer chip
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #ifndef _AM9513_H_
  25 #define _AM9513_H_
  26
  27 #if 0
  28
  29 /*
  30  *      Before including this file, the following need to be defined:
  31  */
  32 #define Am9513_8BITBUS xxx
  33 /* or */
  34 #define Am9513_16BITBUS xxx
  35
  36 #define Am9513_output_control(a)        xxx
  37 #define Am9513_input_status()           xxx
  38 #define Am9513_output_data(a)           xxx
  39 #define Am9513_input_data()             xxx
  40
  41 #endif
  42
  43 /*
  44  *
  45  */
  46
  47 #ifdef Am9513_8BITBUS
  48
  49 #define Am9513_write_register(reg, val)                         \
  50         do {                                                    \
  51                 Am9513_output_control(reg);                     \
  52                 Am9513_output_data(val>>8);                     \
  53                 Am9513_output_data(val&0xff);                   \
  54         } while (0)
  55
  56 #define Am9513_read_register(reg, val)                          \
  57         do {                                                    \
  58                 Am9513_output_control(reg);                     \
  59                 val = Am9513_input_data()<<8;                   \
  60                 val |= Am9513_input_data();                     \
  61         } while (0)
  62
  63 #else /* Am9513_16BITBUS */
  64
  65 #define Am9513_write_register(reg, val)                         \
  66         do {                                                    \
  67                 Am9513_output_control(reg);                     \
  68                 Am9513_output_data(val);                        \
  69         } while (0)
  70
  71 #define Am9513_read_register(reg, val)                          \
  72         do {                                                    \
  73                 Am9513_output_control(reg);                     \
  74                 val = Am9513_input_data();                      \
  75         } while (0)
  76
  77 #endif
  78
  79 #endif