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