LXR linux/drivers/staging/sm750fb/ddk750

   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_ */
  62