66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
|
|
* This is the interface to the sandbox GPIO driver for test code which
|
|
* wants to change the GPIO values reported to U-Boot.
|
|
*
|
|
* Copyright (c) 2011 The Chromium OS Authors.
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef __ASM_SANDBOX_GPIO_H
|
|
#define __ASM_SANDBOX_GPIO_H
|
|
|
|
/*
|
|
* We use the generic interface, and add a back-channel.
|
|
*
|
|
* The back-channel functions are declared in this file. They should not be used
|
|
* except in test code.
|
|
*
|
|
* Test code can, for example, call sandbox_gpio_set_value() to set the value of
|
|
* a simulated GPIO. From then on, normal code in U-Boot will see this new
|
|
* value when it calls gpio_get_value().
|
|
*
|
|
* NOTE: DO NOT use the functions in this file except in test code!
|
|
*/
|
|
#include <asm-generic/gpio.h>
|
|
|
|
/**
|
|
* Return the simulated value of a GPIO (used only in sandbox test code)
|
|
*
|
|
* @param gp GPIO number
|
|
* @return -1 on error, 0 if GPIO is low, >0 if high
|
|
*/
|
|
int sandbox_gpio_get_value(unsigned gp);
|
|
|
|
/**
|
|
* Set the simulated value of a GPIO (used only in sandbox test code)
|
|
*
|
|
* @param gp GPIO number
|
|
* @param value value to set (0 for low, non-zero for high)
|
|
* @return -1 on error, 0 if ok
|
|
*/
|
|
int sandbox_gpio_set_value(unsigned gp, int value);
|
|
|
|
/**
|
|
* Return the simulated direction of a GPIO (used only in sandbox test code)
|
|
*
|
|
* @param gp GPIO number
|
|
* @return -1 on error, 0 if GPIO is input, >0 if output
|
|
*/
|
|
int sandbox_gpio_get_direction(unsigned gp);
|
|
|
|
/**
|
|
* Set the simulated direction of a GPIO (used only in sandbox test code)
|
|
*
|
|
* @param gp GPIO number
|
|
* @param output 0 to set as input, 1 to set as output
|
|
* @return -1 on error, 0 if ok
|
|
*/
|
|
int sandbox_gpio_set_direction(unsigned gp, int output);
|
|
|
|
/* Display information about each GPIO */
|
|
void gpio_info(void);
|
|
|
|
#define gpio_status() gpio_info()
|
|
|
|
#endif
|