/* 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 */
|
