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39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
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/*
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* i2c-gpio interface to platform code
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*
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* Copyright (C) 2007 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _LINUX_I2C_GPIO_H
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#define _LINUX_I2C_GPIO_H
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/**
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* struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
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* @sda_pin: GPIO pin ID to use for SDA
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* @scl_pin: GPIO pin ID to use for SCL
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* @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
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* @timeout: clock stretching timeout in jiffies. If the slave keeps
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* SCL low for longer than this, the transfer will time out.
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* @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
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* isn't actively driven high when setting the output value high.
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* gpio_get_value() must return the actual pin state even if the
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* pin is configured as an output.
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* @scl_is_open_drain: SCL is set up as open drain. Same requirements
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* as for sda_is_open_drain apply.
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* @scl_is_output_only: SCL output drivers cannot be turned off.
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*/
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struct i2c_gpio_platform_data {
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unsigned int sda_pin;
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unsigned int scl_pin;
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int udelay;
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int timeout;
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unsigned int sda_is_open_drain:1;
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unsigned int scl_is_open_drain:1;
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unsigned int scl_is_output_only:1;
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};
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#endif /* _LINUX_I2C_GPIO_H */
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