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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ------------------------------------------------------------------------- */
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
John Anthony Kazos Jr121e70b2007-05-09 08:30:57 +020021/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 Frodo Looijaard <frodol@dds.nl> */
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#ifndef _LINUX_I2C_ALGO_BIT_H
25#define _LINUX_I2C_ALGO_BIT_H
26
27/* --- Defines for bit-adapters --------------------------------------- */
28/*
David Brownell438d6c22006-12-10 21:21:31 +010029 * This struct contains the hw-dependent functions of bit-style adapters to
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 * manipulate the line states, and to init any hw-specific features. This is
David Brownell438d6c22006-12-10 21:21:31 +010031 * only used if you have more than one hw-type of adapter running.
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 */
33struct 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);
Jean Delvare0a9c1472010-03-13 20:56:56 +010039 int (*pre_xfer) (struct i2c_adapter *);
40 void (*post_xfer) (struct i2c_adapter *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42 /* local settings */
Jean Delvare424ed672007-05-01 23:26:33 +020043 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 int timeout; /* in jiffies */
48};
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050int i2c_bit_add_bus(struct i2c_adapter *);
Jean Delvare0f3b4832007-05-01 23:26:31 +020051int i2c_bit_add_numbered_bus(struct i2c_adapter *);
Daniel Vetterb0209b32012-02-28 00:39:39 +010052extern const struct i2c_algorithm i2c_bit_algo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54#endif /* _LINUX_I2C_ALGO_BIT_H */