linux/include/linux/i2c-gpio.h
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   1/*
   2 * i2c-gpio interface to platform code
   3 *
   4 * Copyright (C) 2007 Atmel Corporation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#ifndef _LINUX_I2C_GPIO_H
  11#define _LINUX_I2C_GPIO_H
  12
  13/**
  14 * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
  15 * @sda_pin: GPIO pin ID to use for SDA
  16 * @scl_pin: GPIO pin ID to use for SCL
  17 * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
  18 * @timeout: clock stretching timeout in jiffies. If the slave keeps
  19 *      SCL low for longer than this, the transfer will time out.
  20 * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
  21 *      isn't actively driven high when setting the output value high.
  22 *      gpio_get_value() must return the actual pin state even if the
  23 *      pin is configured as an output.
  24 * @scl_is_open_drain: SCL is set up as open drain. Same requirements
  25 *      as for sda_is_open_drain apply.
  26 * @scl_is_output_only: SCL output drivers cannot be turned off.
  27 */
  28struct i2c_gpio_platform_data {
  29        unsigned int    sda_pin;
  30        unsigned int    scl_pin;
  31        int             udelay;
  32        int             timeout;
  33        unsigned int    sda_is_open_drain:1;
  34        unsigned int    scl_is_open_drain:1;
  35        unsigned int    scl_is_output_only:1;
  36};
  37
  38#endif /* _LINUX_I2C_GPIO_H */
  39
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