[linux-block.git] / include / linux / i2c-algo-bit.h

/* 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 */
Commit	Line	Data
738ac067 WS	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	*/
1da177e4	9
1da177e4 LT	10	#ifndef _LINUX_I2C_ALGO_BIT_H
1da177e4 LT	11	#define _LINUX_I2C_ALGO_BIT_H
2292822e WS	12
2292822e WS	13	#include <linux/i2c.h>
1da177e4 LT	14
	15	/* --- Defines for bit-adapters --------------------------------------- */
	16	/*
438d6c2c	17	* This struct contains the hw-dependent functions of bit-style adapters to
1da177e4	18	* manipulate the line states, and to init any hw-specific features. This is
438d6c2c	19	* only used if you have more than one hw-type of adapter running.
1da177e4 LT	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);
0a9c1475 JD	27	int (pre_xfer) (struct i2c_adapter );
0a9c1475 JD	28	void (post_xfer) (struct i2c_adapter );
1da177e4 LT	29
1da177e4 LT	30	/* local settings */
424ed67c JD	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 */
1da177e4	35	int timeout; /* in jiffies */
8927fbf4	36	bool can_do_atomic; /* callbacks don't sleep, we can be atomic */
1da177e4 LT	37	};
1da177e4 LT	38
1da177e4	39	int i2c_bit_add_bus(struct i2c_adapter *);
0f3b4838	40	int i2c_bit_add_numbered_bus(struct i2c_adapter *);
b0209b39	41	extern const struct i2c_algorithm i2c_bit_algo;
1da177e4 LT	42
1da177e4 LT	43	#endif /* _LINUX_I2C_ALGO_BIT_H */