44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters
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*
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* Copyright (C) 1995-99 Simon G. Vogl
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* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
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* Frodo Looijaard <frodol@dds.nl>
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*/
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#ifndef _LINUX_I2C_ALGO_BIT_H
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#define _LINUX_I2C_ALGO_BIT_H
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#include <linux/i2c.h>
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/* --- Defines for bit-adapters --------------------------------------- */
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/*
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* This struct contains the hw-dependent functions of bit-style adapters to
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* manipulate the line states, and to init any hw-specific features. This is
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* only used if you have more than one hw-type of adapter running.
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*/
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struct i2c_algo_bit_data {
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void *data; /* private data for lowlevel routines */
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void (*setsda) (void *data, int state);
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void (*setscl) (void *data, int state);
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int (*getsda) (void *data);
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int (*getscl) (void *data);
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int (*pre_xfer) (struct i2c_adapter *);
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void (*post_xfer) (struct i2c_adapter *);
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/* local settings */
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int udelay; /* half clock cycle time in us,
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minimum 2 us for fast-mode I2C,
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minimum 5 us for standard-mode I2C and SMBus,
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maximum 50 us for SMBus */
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int timeout; /* in jiffies */
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bool can_do_atomic; /* callbacks don't sleep, we can be atomic */
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};
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int i2c_bit_add_bus(struct i2c_adapter *);
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int i2c_bit_add_numbered_bus(struct i2c_adapter *);
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extern const struct i2c_algorithm i2c_bit_algo;
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#endif /* _LINUX_I2C_ALGO_BIT_H */
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