LXR linux/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#ifndef _LINUX_I2C_ALGO_BIT_H
  25#define _LINUX_I2C_ALGO_BIT_H
  26
  27/* --- Defines for bit-adapters --------------------------------------- */
  28/*
  29 * This struct contains the hw-dependent functions of bit-style adapters to
  30 * manipulate the line states, and to init any hw-specific features. This is
  31 * only used if you have more than one hw-type of adapter running.
  32 */
  33struct i2c_algo_bit_data {
  34        void *data;             /* private data for lowlevel routines */
  35        void (*setsda) (void *data, int state);
  36        void (*setscl) (void *data, int state);
  37        int  (*getsda) (void *data);
  38        int  (*getscl) (void *data);
  39        int  (*pre_xfer)  (struct i2c_adapter *);
  40        void (*post_xfer) (struct i2c_adapter *);
  41
  42        /* local settings */
  43        int udelay;             /* half clock cycle time in us,
  44                                   minimum 2 us for fast-mode I2C,
  45                                   minimum 5 us for standard-mode I2C and SMBus,
  46                                   maximum 50 us for SMBus */
  47        int timeout;            /* in jiffies */
  48};
  49
  50int i2c_bit_add_bus(struct i2c_adapter *);
  51int i2c_bit_add_numbered_bus(struct i2c_adapter *);
  52
  53#endif /* _LINUX_I2C_ALGO_BIT_H */
  54