| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * Copyright (c) 2007 by Silicon Motion, Inc. (SMI) |
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| 4 | * |
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| 5 | * swi2c.h --- SM750/SM718 DDK |
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| 6 | * This file contains the definitions for i2c using software |
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| 7 | * implementation. |
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| 8 | * |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef _SWI2C_H_ |
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| 12 | #define _SWI2C_H_ |
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| 13 | |
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| 14 | /* Default i2c CLK and Data GPIO. These are the default i2c pins */ |
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| 15 | #define DEFAULT_I2C_SCL 30 |
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| 16 | #define DEFAULT_I2C_SDA 31 |
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| 17 | |
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| 18 | /* |
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| 19 | * This function initializes the i2c attributes and bus |
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| 20 | * |
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| 21 | * Parameters: |
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| 22 | * i2cClkGPIO - The GPIO pin to be used as i2c SCL |
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| 23 | * i2cDataGPIO - The GPIO pin to be used as i2c SDA |
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| 24 | * |
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| 25 | * Return Value: |
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| 26 | * -1 - Fail to initialize the i2c |
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| 27 | * 0 - Success |
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| 28 | */ |
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| 29 | long sm750_sw_i2c_init(unsigned char clk_gpio, unsigned char data_gpio); |
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| 30 | |
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| 31 | /* |
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| 32 | * This function reads the slave device's register |
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| 33 | * |
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| 34 | * Parameters: |
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| 35 | * addr - i2c Slave device address which register |
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| 36 | * to be read from |
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| 37 | * reg - Slave device's register to be read |
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| 38 | * |
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| 39 | * Return Value: |
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| 40 | * Register value |
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| 41 | */ |
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| 42 | unsigned char sm750_sw_i2c_read_reg(unsigned char addr, unsigned char reg); |
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| 43 | |
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| 44 | /* |
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| 45 | * This function writes a value to the slave device's register |
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| 46 | * |
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| 47 | * Parameters: |
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| 48 | * addr - i2c Slave device address which register |
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| 49 | * to be written |
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| 50 | * reg - Slave device's register to be written |
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| 51 | * data - Data to be written to the register |
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| 52 | * |
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| 53 | * Result: |
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| 54 | * 0 - Success |
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| 55 | * -1 - Fail |
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| 56 | */ |
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| 57 | long sm750_sw_i2c_write_reg(unsigned char addr, |
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| 58 | unsigned char reg, |
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| 59 | unsigned char data); |
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| 60 | |
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| 61 | #endif /* _SWI2C_H_ */ |
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| 62 | |
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