1 /* 2 * Copyright (c) 2007 by Silicon Motion, Inc. (SMI) 3 * 4 * All rights are reserved. Reproduction or in part is prohibited 5 * without the written consent of the copyright owner. 6 * 7 * swi2c.h --- SM750/SM718 DDK 8 * This file contains the definitions for i2c using software 9 * implementation. 10 * 11 */ 12 13 #ifndef _SWI2C_H_ 14 #define _SWI2C_H_ 15 16 /* Default i2c CLK and Data GPIO. These are the default i2c pins */ 17 #define DEFAULT_I2C_SCL 30 18 #define DEFAULT_I2C_SDA 31 19 20 /* 21 * This function initializes the i2c attributes and bus 22 * 23 * Parameters: 24 * i2cClkGPIO - The GPIO pin to be used as i2c SCL 25 * i2cDataGPIO - The GPIO pin to be used as i2c SDA 26 * 27 * Return Value: 28 * -1 - Fail to initialize the i2c 29 * 0 - Success 30 */ 31 long sm750_sw_i2c_init( 32 unsigned char clk_gpio, 33 unsigned char data_gpio 34 ); 35 36 /* 37 * This function reads the slave device's register 38 * 39 * Parameters: 40 * addr - i2c Slave device address which register 41 * to be read from 42 * reg - Slave device's register to be read 43 * 44 * Return Value: 45 * Register value 46 */ 47 unsigned char sm750_sw_i2c_read_reg( 48 unsigned char addr, 49 unsigned char reg 50 ); 51 52 /* 53 * This function writes a value to the slave device's register 54 * 55 * Parameters: 56 * addr - i2c Slave device address which register 57 * to be written 58 * reg - Slave device's register to be written 59 * data - Data to be written to the register 60 * 61 * Result: 62 * 0 - Success 63 * -1 - Fail 64 */ 65 long sm750_sw_i2c_write_reg( 66 unsigned char addr, 67 unsigned char reg, 68 unsigned char data 69 ); 70 71 #endif /* _SWI2C_H_ */ 72