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  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., 51 Franklin Street, Fifth Floor, Boston,
  19.     MA 02110-1301 USA.                                                       */
  20. /* ------------------------------------------------------------------------- */
  21.  
  22. /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
  23.    Frodo Looijaard <frodol@dds.nl> */
  24.  
  25. #ifndef _LINUX_I2C_ALGO_BIT_H
  26. #define _LINUX_I2C_ALGO_BIT_H
  27.  
  28. /* --- Defines for bit-adapters --------------------------------------- */
  29. /*
  30.  * This struct contains the hw-dependent functions of bit-style adapters to
  31.  * manipulate the line states, and to init any hw-specific features. This is
  32.  * only used if you have more than one hw-type of adapter running.
  33.  */
  34. struct i2c_algo_bit_data {
  35.         void *data;             /* private data for lowlevel routines */
  36.         void (*setsda) (void *data, int state);
  37.         void (*setscl) (void *data, int state);
  38.         int  (*getsda) (void *data);
  39.         int  (*getscl) (void *data);
  40.         int  (*pre_xfer)  (struct i2c_adapter *);
  41.         void (*post_xfer) (struct i2c_adapter *);
  42.  
  43.         /* local settings */
  44.         int udelay;             /* half clock cycle time in us,
  45.                                    minimum 2 us for fast-mode I2C,
  46.                                    minimum 5 us for standard-mode I2C and SMBus,
  47.                                    maximum 50 us for SMBus */
  48.         int timeout;            /* in jiffies */
  49. };
  50.  
  51. int i2c_bit_add_bus(struct i2c_adapter *);
  52. int i2c_bit_add_numbered_bus(struct i2c_adapter *);
  53. extern const struct i2c_algorithm i2c_bit_algo;
  54.  
  55. #endif /* _LINUX_I2C_ALGO_BIT_H */
  56.