include/linux/i2c-algo-bit.h

   1 /* ------------------------------------------------------------------------- */
   2 /* i2c-algo-bit.h i2c driver algorithms for bit-shift adapters               */
   3 /* ------------------------------------------------------------------------- */
   4 /*   Copyright (C) 1995-99 Simon G. Vogl
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                */
  19 /* ------------------------------------------------------------------------- */
  20
  21 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
  22    Frodo Looijaard <frodol@dds.nl> */
  23
  24 /* $Id: i2c-algo-bit.h,v 1.10 2003/01/21 08:08:16 kmalkki Exp $ */
  25
  26 #ifndef _LINUX_I2C_ALGO_BIT_H
  27 #define _LINUX_I2C_ALGO_BIT_H
  28
  29 /* --- Defines for bit-adapters --------------------------------------- */
  30 /*
  31  * This struct contains the hw-dependent functions of bit-style adapters to
  32  * manipulate the line states, and to init any hw-specific features. This is
  33  * only used if you have more than one hw-type of adapter running.
  34  */
  35 struct i2c_algo_bit_data {
  36         void *data;             /* private data for lowlevel routines */
  37         void (*setsda) (void *data, int state);
  38         void (*setscl) (void *data, int state);
  39         int  (*getsda) (void *data);
  40         int  (*getscl) (void *data);
  41
  42         /* local settings */
  43         int udelay;             /* half-clock-cycle time in microsecs */
  44                                 /* i.e. clock is (500 / udelay) KHz */
  45         int mdelay;             /* in millisecs, unused */
  46         int timeout;            /* in jiffies */
  47 };
  48
  49 #define I2C_BIT_ADAP_MAX        16
  50
  51 int i2c_bit_add_bus(struct i2c_adapter *);
  52 int i2c_bit_del_bus(struct i2c_adapter *);
  53
  54 #endif /* _LINUX_I2C_ALGO_BIT_H */