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 Ky��sti M��lkki <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 */
21struct 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
39int i2c_bit_add_bus(struct i2c_adapter *);
40int i2c_bit_add_numbered_bus(struct i2c_adapter *);
41extern const struct i2c_algorithm i2c_bit_algo;
42
43#endif /* _LINUX_I2C_ALGO_BIT_H */
44