1 /* ------------------------------------------------------------------------- */
2 /* i2c-algo-bit.h i2c driver algorithms for bit-shift adapters */
3 /* ------------------------------------------------------------------------- */
4 /* Copyright (C) 1995-99 Simon G. Vogl
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.
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.
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,
20 /* ------------------------------------------------------------------------- */
22 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
23 Frodo Looijaard <frodol@dds.nl> */
25 #ifndef _LINUX_I2C_ALGO_BIT_H
26 #define _LINUX_I2C_ALGO_BIT_H
28 #include <linux/i2c.h>
30 /* --- Defines for bit-adapters --------------------------------------- */
32 * This struct contains the hw-dependent functions of bit-style adapters to
33 * manipulate the line states, and to init any hw-specific features. This is
34 * only used if you have more than one hw-type of adapter running.
36 struct i2c_algo_bit_data {
37 void *data; /* private data for lowlevel routines */
38 void (*setsda) (void *data, int state);
39 void (*setscl) (void *data, int state);
40 int (*getsda) (void *data);
41 int (*getscl) (void *data);
42 int (*pre_xfer) (struct i2c_adapter *);
43 void (*post_xfer) (struct i2c_adapter *);
46 int udelay; /* half clock cycle time in us,
47 minimum 2 us for fast-mode I2C,
48 minimum 5 us for standard-mode I2C and SMBus,
49 maximum 50 us for SMBus */
50 int timeout; /* in jiffies */
53 int i2c_bit_add_bus(struct i2c_adapter *);
54 int i2c_bit_add_numbered_bus(struct i2c_adapter *);
55 extern const struct i2c_algorithm i2c_bit_algo;
57 #endif /* _LINUX_I2C_ALGO_BIT_H */