1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters
4  *
5  *   Copyright (C) 1995-99 Simon G. Vogl
6  * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
7  * Frodo Looijaard <frodol@dds.nl>
8  */
9 
10 #ifndef _LINUX_I2C_ALGO_BIT_H
11 #define _LINUX_I2C_ALGO_BIT_H
12 
13 #include <linux/i2c.h>
14 
15 /* --- Defines for bit-adapters ---------------------------------------	*/
16 /*
17  * This struct contains the hw-dependent functions of bit-style adapters to
18  * manipulate the line states, and to init any hw-specific features. This is
19  * only used if you have more than one hw-type of adapter running.
20  */
21 struct i2c_algo_bit_data {
22 	void *data;		/* private data for lowlevel routines */
23 	void (*setsda) (void *data, int state);
24 	void (*setscl) (void *data, int state);
25 	int  (*getsda) (void *data);
26 	int  (*getscl) (void *data);
27 	int  (*pre_xfer)  (struct i2c_adapter *);
28 	void (*post_xfer) (struct i2c_adapter *);
29 
30 	/* local settings */
31 	int udelay;		/* half clock cycle time in us,
32 				   minimum 2 us for fast-mode I2C,
33 				   minimum 5 us for standard-mode I2C and SMBus,
34 				   maximum 50 us for SMBus */
35 	int timeout;		/* in jiffies */
36 	bool can_do_atomic;	/* callbacks don't sleep, we can be atomic */
37 };
38 
39 int i2c_bit_add_bus(struct i2c_adapter *);
40 int i2c_bit_add_numbered_bus(struct i2c_adapter *);
41 extern const struct i2c_algorithm i2c_bit_algo;
42 
43 #endif /* _LINUX_I2C_ALGO_BIT_H */
44