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 | |