ddk750_swi2c.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *         Copyright (c) 2007 by Silicon Motion, Inc. (SMI)
 4 *
 5 *  swi2c.h --- SM750/SM718 DDK
 6 *  This file contains the definitions for i2c using software
 7 *  implementation.
 8 *
 9 */
10
11#ifndef _SWI2C_H_
12#define _SWI2C_H_
13
14/* Default i2c CLK and Data GPIO. These are the default i2c pins */
15#define DEFAULT_I2C_SCL                     30
16#define DEFAULT_I2C_SDA                     31
17
18/*
19 * This function initializes the i2c attributes and bus
20 *
21 * Parameters:
22 *      i2cClkGPIO  - The GPIO pin to be used as i2c SCL
23 *      i2cDataGPIO - The GPIO pin to be used as i2c SDA
24 *
25 * Return Value:
26 *      -1   - Fail to initialize the i2c
27 *       0   - Success
28 */
29long sm750_sw_i2c_init(unsigned char clk_gpio, unsigned char data_gpio);
30
31/*
32 *  This function reads the slave device's register
33 *
34 *  Parameters:
35 *      addr   - i2c Slave device address which register
36 *                        to be read from
37 *      reg    - Slave device's register to be read
38 *
39 *  Return Value:
40 *      Register value
41 */
42unsigned char sm750_sw_i2c_read_reg(unsigned char addr, unsigned char reg);
43
44/*
45 *  This function writes a value to the slave device's register
46 *
47 *  Parameters:
48 *      addr            - i2c Slave device address which register
49 *                        to be written
50 *      reg             - Slave device's register to be written
51 *      data            - Data to be written to the register
52 *
53 *  Result:
54 *          0   - Success
55 *         -1   - Fail
56 */
57long sm750_sw_i2c_write_reg(unsigned char addr,
58			    unsigned char reg,
59			    unsigned char data);
60
61#endif  /* _SWI2C_H_ */