/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2007 by Silicon Motion, Inc. (SMI)
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*
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* swi2c.h --- SM750/SM718 DDK
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* This file contains the definitions for i2c using software
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* implementation.
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*
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*/
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#ifndef _SWI2C_H_
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#define _SWI2C_H_
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/* Default i2c CLK and Data GPIO. These are the default i2c pins */
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#define DEFAULT_I2C_SCL 30
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#define DEFAULT_I2C_SDA 31
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/*
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* This function initializes the i2c attributes and bus
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*
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* Parameters:
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* i2cClkGPIO - The GPIO pin to be used as i2c SCL
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* i2cDataGPIO - The GPIO pin to be used as i2c SDA
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*
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* Return Value:
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* -1 - Fail to initialize the i2c
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* 0 - Success
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*/
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long sm750_sw_i2c_init(unsigned char clk_gpio, unsigned char data_gpio);
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/*
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* This function reads the slave device's register
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*
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* Parameters:
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* addr - i2c Slave device address which register
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* to be read from
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* reg - Slave device's register to be read
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*
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* Return Value:
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* Register value
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*/
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unsigned char sm750_sw_i2c_read_reg(unsigned char addr, unsigned char reg);
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/*
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* This function writes a value to the slave device's register
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*
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* Parameters:
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* addr - i2c Slave device address which register
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* to be written
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* reg - Slave device's register to be written
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* data - Data to be written to the register
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*
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* Result:
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* 0 - Success
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* -1 - Fail
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*/
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long sm750_sw_i2c_write_reg(unsigned char addr,
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unsigned char reg,
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unsigned char data);
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#endif /* _SWI2C_H_ */
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