mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
|
/*
|
||
|
|
* i2c-gpio interface to platform code
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Atmel Corporation
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
#ifndef _LINUX_I2C_GPIO_H
|
||
|
|
#define _LINUX_I2C_GPIO_H
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
|
||
|
|
* @sda_pin: GPIO pin ID to use for SDA
|
||
|
|
* @scl_pin: GPIO pin ID to use for SCL
|
||
|
|
* @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
|
||
|
|
* @timeout: clock stretching timeout in jiffies. If the slave keeps
|
||
|
|
* SCL low for longer than this, the transfer will time out.
|
||
|
|
* @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
|
||
|
|
* isn't actively driven high when setting the output value high.
|
||
|
|
* gpio_get_value() must return the actual pin state even if the
|
||
|
|
* pin is configured as an output.
|
||
|
|
* @scl_is_open_drain: SCL is set up as open drain. Same requirements
|
||
|
|
* as for sda_is_open_drain apply.
|
||
|
|
* @scl_is_output_only: SCL output drivers cannot be turned off.
|
||
|
|
*/
|
||
|
|
struct i2c_gpio_platform_data {
|
||
|
|
unsigned int sda_pin;
|
||
|
|
unsigned int scl_pin;
|
||
|
|
int udelay;
|
||
|
|
int timeout;
|
||
|
|
unsigned int sda_is_open_drain:1;
|
||
|
|
unsigned int scl_is_open_drain:1;
|
||
|
|
unsigned int scl_is_output_only:1;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* _LINUX_I2C_GPIO_H */
|