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
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