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., 675 Mass Ave, Cambridge, MA 02139, USA.                */
19 /* ------------------------------------------------------------------------- */
20 
21 /* With some changes from Ky�sti M�lkki <kmalkki@cc.hut.fi> and even
22    Frodo Looijaard <frodol@dds.nl> */
23 
24 /* $Id: i2c-algo-bit.h,v 1.7 1999/12/21 23:45:58 frodo Exp $ */
25 
26 #ifndef I2C_ALGO_BIT_H
27 #define I2C_ALGO_BIT_H 1
28 
29 #include <linux/i2c.h>
30 
31 /* --- Defines for bit-adapters ---------------------------------------	*/
32 /*
33  * This struct contains the hw-dependent functions of bit-style adapters to
34  * manipulate the line states, and to init any hw-specific features. This is
35  * only used if you have more than one hw-type of adapter running.
36  */
37 struct i2c_algo_bit_data {
38 	void *data;		/* private data for lowlevel routines */
39 	void (*setsda) (void *data, int state);
40 	void (*setscl) (void *data, int state);
41 	int  (*getsda) (void *data);
42 	int  (*getscl) (void *data);
43 
44 	/* local settings */
45 	int udelay;		/* half-clock-cycle time in microsecs */
46 				/* i.e. clock is (500 / udelay) KHz */
47 	int mdelay;		/* in millisecs, unused */
48 	int timeout;		/* in jiffies */
49 };
50 
51 int i2c_bit_add_bus(struct i2c_adapter *);
52 int i2c_bit_del_bus(struct i2c_adapter *);
53 
54 #endif /* I2C_ALGO_BIT_H */
55