include/linux/i2c-gpio.h

   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  */
  28 struct 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 */