u-boot/arch/sandbox/include/asm/gpio.h
Wolfgang Denk 1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00

65 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