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