82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* This is the interface to the sandbox GPIO driver for test code which
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* wants to change the GPIO values reported to U-Boot.
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*
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* Copyright (c) 2011 The Chromium OS Authors.
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_SANDBOX_GPIO_H
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#define __ASM_SANDBOX_GPIO_H
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/*
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* We use the generic interface, and add a back-channel.
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*
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* The back-channel functions are declared in this file. They should not be used
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* except in test code.
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*
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* Test code can, for example, call sandbox_gpio_set_value() to set the value of
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* a simulated GPIO. From then on, normal code in U-Boot will see this new
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* value when it calls gpio_get_value().
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*
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* NOTE: DO NOT use the functions in this file except in test code!
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*/
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#include <asm-generic/gpio.h>
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/**
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* Return the simulated value of a GPIO (used only in sandbox test code)
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*
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* @param gp GPIO number
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* @return -1 on error, 0 if GPIO is low, >0 if high
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*/
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int sandbox_gpio_get_value(unsigned gp);
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/**
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* Set the simulated value of a GPIO (used only in sandbox test code)
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*
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* @param gp GPIO number
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* @param value value to set (0 for low, non-zero for high)
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* @return -1 on error, 0 if ok
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*/
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int sandbox_gpio_set_value(unsigned gp, int value);
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/**
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* Return the simulated direction of a GPIO (used only in sandbox test code)
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*
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* @param gp GPIO number
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* @return -1 on error, 0 if GPIO is input, >0 if output
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*/
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int sandbox_gpio_get_direction(unsigned gp);
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/**
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* Set the simulated direction of a GPIO (used only in sandbox test code)
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*
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* @param gp GPIO number
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* @param output 0 to set as input, 1 to set as output
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* @return -1 on error, 0 if ok
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*/
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int sandbox_gpio_set_direction(unsigned gp, int output);
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/* Display information about each GPIO */
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void gpio_info(void);
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#define gpio_status() gpio_info()
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#endif
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