drivers/staging/sm750fb/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  */
  29 long 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  */
  42 unsigned 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  */
  57 long sm750_sw_i2c_write_reg(unsigned char addr,
  58                             unsigned char reg,
  59                             unsigned char data);
  60
  61 #endif  /* _SWI2C_H_ */