blob: 7fd5575a368f95d4208de03fb20b3e9be659dd65 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters
*
* Copyright (C) 1995-99 Simon G. Vogl
* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
* Frodo Looijaard <frodol@dds.nl>
*/
#ifndef _LINUX_I2C_ALGO_BIT_H
#define _LINUX_I2C_ALGO_BIT_H
#include <linux/i2c.h>
/* --- Defines for bit-adapters --------------------------------------- */
/*
* This struct contains the hw-dependent functions of bit-style adapters to
* manipulate the line states, and to init any hw-specific features. This is
* only used if you have more than one hw-type of adapter running.
*/
struct i2c_algo_bit_data {
void *data; /* private data for lowlevel routines */
void (*setsda) (void *data, int state);
void (*setscl) (void *data, int state);
int (*getsda) (void *data);
int (*getscl) (void *data);
int (*pre_xfer) (struct i2c_adapter *);
void (*post_xfer) (struct i2c_adapter *);
/* local settings */
int udelay; /* half clock cycle time in us,
minimum 2 us for fast-mode I2C,
minimum 5 us for standard-mode I2C and SMBus,
maximum 50 us for SMBus */
int timeout; /* in jiffies */
bool can_do_atomic; /* callbacks don't sleep, we can be atomic */
};
int i2c_bit_add_bus(struct i2c_adapter *);
int i2c_bit_add_numbered_bus(struct i2c_adapter *);
extern const struct i2c_algorithm i2c_bit_algo;
#endif /* _LINUX_I2C_ALGO_BIT_H */
|
