release/src-rt-6.x.4708/linux/linux-2.6.36/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  */
  33 struct 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
  50 int i2c_bit_add_bus(struct i2c_adapter *);
  51 int i2c_bit_add_numbered_bus(struct i2c_adapter *);
  52
  53 #endif /* _LINUX_I2C_ALGO_BIT_H */