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TOMOYO Linux Cross Reference
Linux/include/linux/i2c-algo-bit.h

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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 

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