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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 <[email protected]> and even
23  Frodo Looijaard <[email protected]> */
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  */
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 *);
53 extern const struct i2c_algorithm i2c_bit_algo;
54 
55 #endif /* _LINUX_I2C_ALGO_BIT_H */